Merge pull request #18 from uja-dev-practices/develop

V1.0

.gitignore

@@ -4,6 +4,7 @@
 .env.*
 !.env.example
 
+
 # --- PYTHON BACKEND ---
 __pycache__/
 *.pyc
@@ -22,6 +23,13 @@ ENV/
 # FastAPI / Uvicorn
 *.pid
 
+# Test / type checkers
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.coverage
+htmlcov/
+
 # --- NODE FRONTEND ---
 node_modules/
 dist/

backend/.dockerignore

@@ -0,0 +1,20 @@
+.env
+.env.*
+!.env.example
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+*.log
+*.sqlite3
+*.db
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.venv/
+venv/
+.git/
+.gitignore
+README.md
+docs/
+tests/

backend/.env.example

@@ -1,19 +1,81 @@
-ORCID_CLIENT_ID=123412341234
-ORCID_CLIENT_SECRET=123412341234
-
-API_KEY_NAME=X-API-Key
-API_KEY_VALUE=123412341234
+# ============================================================
+# ENVIRONMENT
+# ============================================================
+ENVIRONMENT=development
+DEBUG=false
 
+# ============================================================
+# DATABASE / CACHE
+# ============================================================
 DATABASE_URL=postgresql://postgres:postgres@db:5432/orcid_db
 REDIS_URL=redis://redis:6379/0
 
+# ============================================================
+# BASE URL (uso interno del scheduler)
+# ============================================================
 BASE_URL=http://localhost:8000/api
 
+# ============================================================
+# CORS — lista blanca estricta separada por comas
+# Nunca uses "*" si allow_credentials=true.
+# ============================================================
+CORS_ALLOWED_ORIGINS=http://localhost:5173
+
+# ============================================================
+# Trusted Hosts — anti Host-header injection (en prod, sé explícito)
+# ============================================================
+TRUSTED_HOSTS=*
+
+# ============================================================
 # JWT (login ORCID)
-JWT_SECRET=change_me
+# Genera un secreto fuerte: `openssl rand -base64 64`
+# ============================================================
+JWT_SECRET=change_me_to_a_long_random_value_at_least_32_chars
 JWT_ALGORITHM=HS256
 JWT_EXPIRES_MINUTES=720
+JWT_ISSUER=orcid-sword-backend
+JWT_AUDIENCE=orcid-sword-frontend
 
+# ============================================================
+# API key máquina-a-máquina (scheduler interno)
+# Genera con: `python -c "import secrets;print(secrets.token_urlsafe(48))"`
+# ============================================================
+API_KEY_NAME=X-API-Key
+API_KEY_VALUE=replace_with_a_strong_random_value_min_24_chars
+
+# ============================================================
 # ORCID OAuth 3-legged (authorization code)
-# Debe coincidir exactamente con el redirect URI configurado en tu app ORCID.
+# ============================================================
+ORCID_CLIENT_ID=APP-XXXXXXXXXXXXXXXX
+ORCID_CLIENT_SECRET=replace_me
 ORCID_REDIRECT_URI=http://localhost:8000/api/auth/orcid/callback
+ORCID_OAUTH_STATE_ENABLED=true
+
+# ============================================================
+# Rate limits (formato slowapi: "<n>/<window>")
+# ============================================================
+RATE_LIMIT_DEFAULT=60/minute
+RATE_LIMIT_AUTH=10/minute
+RATE_LIMIT_SEARCH_ANON=5/minute
+RATE_LIMIT_SEARCH_AUTH=30/minute
+RATE_LIMIT_EXPORT=20/minute
+RATE_LIMIT_SYNC=5/minute
+
+# ============================================================
+# Tope de tamaños (anti DoS)
+# ============================================================
+MAX_ORCID_BATCH=25
+MAX_PUB_IDS_BATCH=500
+MAX_REQUEST_BODY_BYTES=1048576
+
+# ============================================================
+# Documentación interactiva (deshabilita en producción si no es necesaria)
+# ============================================================
+DOCS_ENABLED=true
+
+# ============================================================
+# HSTS
+# ============================================================
+SECURITY_HSTS_SECONDS=31536000
+SECURITY_HSTS_INCLUDE_SUBDOMAINS=true
+SECURITY_HSTS_PRELOAD=false

backend/Dockerfile

@@ -1,10 +1,36 @@
-FROM python:3.12-slim
+FROM python:3.12-slim AS base
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1
+
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends curl \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN groupadd --system --gid 1001 app \
+ && useradd  --system --uid 1001 --gid app --home /app --shell /usr/sbin/nologin app
 
 WORKDIR /app
 
-COPY requirements.txt .
+COPY requirements.txt ./
 RUN pip install --no-cache-dir -r requirements.txt
 
 COPY app ./app
 
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
+RUN chown -R app:app /app
+
+USER app
+
+EXPOSE 8000
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=15s --retries=3 \
+  CMD curl -fsS http://127.0.0.1:8000/health || exit 1
+
+CMD ["uvicorn", "app.main:app", \
+     "--host", "0.0.0.0", \
+     "--port", "8000", \
+     "--proxy-headers", \
+     "--forwarded-allow-ips", "*", \
+     "--no-server-header"]

backend/app/api/auth.py

@@ -1,64 +1,68 @@
+import logging
+
 import httpx
-import os
-from pathlib import Path
-from dotenv import load_dotenv
-from fastapi import APIRouter, Depends, HTTPException, status
-from fastapi.responses import RedirectResponse
+from fastapi import APIRouter, Depends, HTTPException, Request, status
+from fastapi.responses import JSONResponse, RedirectResponse
 from sqlalchemy.orm import Session
 
+from app.core.config import settings
+from app.core.rate_limit import limiter
 from app.db.models import Researcher
 from app.db.session import get_db
 from app.schema.auth import OrcidLoginResponseSchema
 from app.security.jwt import create_access_token
+from app.security.oauth_state import (
+    attach_state_cookie,
+    clear_state_cookie,
+    generate_state,
+    validate_state,
+)
 from app.services.orcid_client import ORCIDClient
 from app.utils.orcid_validator import is_valid_orcid
 
-# Asegura que al ejecutar `uvicorn` local también se carga `backend/.env`.
-_ENV_PATH = Path(__file__).resolve().parents[2] / ".env"
-load_dotenv(dotenv_path=_ENV_PATH, override=False)
-
 
 router = APIRouter(prefix="/auth", tags=["auth"])
+logger = logging.getLogger("app.auth")
 
 
 def _extract_display_name(record: dict) -> str | None:
     person = (record or {}).get("person") or {}
     name = person.get("name") or {}
-    given = ((name.get("given-names") or {}).get("value")) if isinstance(name.get("given-names"), dict) else None
-    family = ((name.get("family-name") or {}).get("value")) if isinstance(name.get("family-name"), dict) else None
-    full = " ".join([p for p in [given, family] if p])
+    given_obj = name.get("given-names")
+    family_obj = name.get("family-name")
+    given = given_obj.get("value") if isinstance(given_obj, dict) else None
+    family = family_obj.get("value") if isinstance(family_obj, dict) else None
+    full = " ".join(p for p in [given, family] if p)
     return full or None
 
 
 def _orcid_redirect_uri() -> str:
-    # Debe coincidir con el `redirect_uri` registrado en tu integración ORCID.
-    return os.getenv("ORCID_REDIRECT_URI") or "http://localhost:8000/api/auth/orcid/callback"
+    return settings.ORCID_REDIRECT_URI
 
 
 def _complete_oauth_login(*, code: str, db: Session) -> OrcidLoginResponseSchema:
     """
-    Completa el login OAuth:
-    1) intercambio del `code` en ORCID (server-side)
-    2) crea/actualiza el investigador
-    3) emite nuestro JWT
+    1) Intercambia el `code` con ORCID (server-side).
+    2) Crea/actualiza el investigador.
+    3) Emite el JWT propio.
     """
-    if not code:
-        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Missing ORCID authorization code")
+    if not code or len(code) > 256:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Invalid ORCID authorization code")
 
     client = ORCIDClient()
-    redirect_uri = _orcid_redirect_uri()
-
     try:
-        token_data = client.exchange_authorization_code(code=code, redirect_uri=redirect_uri)
+        token_data = client.exchange_authorization_code(code=code, redirect_uri=_orcid_redirect_uri())
     except httpx.HTTPStatusError as exc:
+        logger.warning("ORCID token exchange failed: %s", exc.response.status_code)
         raise HTTPException(
             status_code=status.HTTP_502_BAD_GATEWAY,
-            detail=f"ORCID token error ({exc.response.status_code})",
-        )
-    except httpx.TimeoutException:
-        raise HTTPException(status_code=status.HTTP_504_GATEWAY_TIMEOUT, detail="ORCID timeout")
-    except Exception:
-        raise HTTPException(status_code=status.HTTP_502_BAD_GATEWAY, detail="ORCID unavailable")
+            detail="ORCID token exchange failed",
+        ) from exc
+    except httpx.TimeoutException as exc:
+        raise HTTPException(status_code=status.HTTP_504_GATEWAY_TIMEOUT, detail="ORCID timeout") from exc
+    except Exception as exc:
+        logger.exception("Unexpected error during ORCID token exchange")
+        raise HTTPException(status_code=status.HTTP_502_BAD_GATEWAY, detail="ORCID unavailable") from exc
 
     orcid_id = (token_data.get("orcid") or "").strip()
     if not is_valid_orcid(orcid_id):
@@ -66,7 +70,6 @@ def _complete_oauth_login(*, code: str, db: Session) -> OrcidLoginResponseSchema
 
     display_name = token_data.get("name")
     if not display_name:
-        # Fallback si ORCID no devuelve `name` en el token response.
         try:
             record = client.fetch_record(orcid_id)
             display_name = _extract_display_name(record)
@@ -89,21 +92,54 @@ def _complete_oauth_login(*, code: str, db: Session) -> OrcidLoginResponseSchema
     return OrcidLoginResponseSchema(access_token=token)
 
 
-@router.get("/orcid/authorize")
-def authorize_orcid():
+def complete_oauth_login_response(
+    *, request: Request, code: str, state: str | None, db: Session
+) -> JSONResponse:
     """
-    Inicia el flujo OAuth 3-legged (authorization code) hacia ORCID.
+    Valida `state`, completa el login y limpia la cookie del state.
+    Devuelve directamente la JSONResponse (para poder borrar cookie).
+    """
+    validate_state(request, state)
+    payload = _complete_oauth_login(code=code, db=db)
+    json_resp = JSONResponse(content=payload.model_dump())
+    clear_state_cookie(json_resp)
+    return json_resp
+
+
+# ---------------------------------------------------------
+# ENDPOINT 1: Iniciar flujo OAuth 3-legged hacia ORCID
+# ---------------------------------------------------------
+
+@router.get("/orcid/authorize")
+@limiter.limit(settings.RATE_LIMIT_AUTH)
+def authorize_orcid(request: Request):
+    """
+    Genera la URL de autorización ORCID y persiste el `state` en cookie
+    HttpOnly para validarlo en el callback (anti-CSRF).
     """
     client = ORCIDClient()
+    state = generate_state() if settings.ORCID_OAUTH_STATE_ENABLED else None
     authorize_url = client.build_authorize_url(
         redirect_uri=_orcid_redirect_uri(),
-        # Solo necesitamos el Authenticated iD del usuario.
         scope="/authenticate",
+        state=state,
     )
-    return RedirectResponse(authorize_url)
+    response = RedirectResponse(authorize_url)
+    if state:
+        attach_state_cookie(response, state)
+    return response
 
 
+# ---------------------------------------------------------
+# ENDPOINT 2: Callback OAuth 3-legged desde ORCID
+# ---------------------------------------------------------
+
 @router.get("/orcid/callback", response_model=OrcidLoginResponseSchema)
-def orcid_callback(code: str, db: Session = Depends(get_db)):
-    return _complete_oauth_login(code=code, db=db)
-
+@limiter.limit(settings.RATE_LIMIT_AUTH)
+def orcid_callback(
+    request: Request,
+    code: str,
+    state: str | None = None,
+    db: Session = Depends(get_db),
+):
+    return complete_oauth_login_response(request=request, code=code, state=state, db=db)

backend/app/api/export.py

@@ -1,167 +1,208 @@
-from fastapi import APIRouter, Depends, HTTPException
-from fastapi.responses import Response
-from sqlalchemy.orm import Session
+from typing import Iterable, List
 from uuid import UUID
 
+from fastapi import APIRouter, Body, Depends, HTTPException, Path, Request
+from fastapi.responses import Response
+from sqlalchemy.orm import Session
+
+from app.core.config import settings
+from app.core.rate_limit import limiter
+from app.db.models import Publication, PublicationDownload, Researcher
 from app.db.session import get_db
-from app.db.models import Publication, Researcher, PublicationDownload
 from app.security.api_key import get_api_key_optional
 from app.security.jwt import get_optional_current_researcher
 from app.services.sword_generator import SWORDGenerator
 from app.services.zip_generator import ZIPGenerator
+from app.utils.orcid_validator import ORCID_PATTERN, is_valid_orcid
+
 
 router = APIRouter(prefix="/export")
 
 
-def validate_uuid_list(pub_ids: list[str]) -> list[UUID]:
-    valid_ids = []
-    for pid in pub_ids:
-        try:
-            valid_ids.append(UUID(pid))
-        except Exception:
-            raise HTTPException(
-                status_code=400,
-                detail=f"Invalid publication ID (not UUID): {pid}"
-            )
-    return valid_ids
+def _ensure_credentials(api_key: str | None, current: Researcher | None) -> None:
+    if not api_key and not current:
+        raise HTTPException(status_code=401, detail="Authentication required")
 
 
+def _record_downloads(db: Session, current: Researcher, pubs: Iterable[Publication]) -> None:
+    """
+    Inserta marcadores de descarga (researcher_id, publication_id).
+
+    - Resuelve descargas existentes con UNA sola query.
+    - Solo añade las que faltan.
+    """
+    pub_ids = [p.id for p in pubs]
+    if not pub_ids:
+        return
+
+    existing_ids = {
+        row[0]
+        for row in (
+            db.query(PublicationDownload.publication_id)
+            .filter(
+                PublicationDownload.researcher_id == current.id,
+                PublicationDownload.publication_id.in_(pub_ids),
+            )
+            .all()
+        )
+    }
+
+    new_rows = [
+        PublicationDownload(researcher_id=current.id, publication_id=pid)
+        for pid in pub_ids
+        if pid not in existing_ids
+    ]
+    if new_rows:
+        db.add_all(new_rows)
+        db.commit()
+
+
+def _validate_pub_ids(pub_ids: List[UUID]) -> List[UUID]:
+    if len(pub_ids) > settings.MAX_PUB_IDS_BATCH:
+        raise HTTPException(status_code=413, detail="Too many publication IDs")
+    return pub_ids
+
+
+def _raise_clear_error_if_researcher_id_was_used(db: Session, pub_ids: List[UUID]) -> None:
+    """
+    Si el cliente envía por error el UUID de un investigador al endpoint
+    de publicaciones, devolvemos un mensaje explícito para guiar el uso.
+    """
+    if len(pub_ids) != 1:
+        return
+
+    researcher = db.query(Researcher).filter(Researcher.id == pub_ids[0]).first()
+    if researcher:
+        raise HTTPException(
+            status_code=400,
+            detail=(
+                "The provided UUID belongs to a researcher, not a publication. "
+                "Use publication IDs for this endpoint, or call "
+                f"/api/export/sword/researcher/{researcher.orcid_id} "
+                f"(or /api/export/zip/researcher/{researcher.orcid_id})."
+            ),
+        )
+
+
+# ---------------------------------------------------------
+# ENDPOINT 1: SWORD múltiples publicaciones
+# ---------------------------------------------------------
+
 @router.post("/sword/publications")
+@limiter.limit(settings.RATE_LIMIT_EXPORT)
 async def export_multiple_sword(
-    pub_ids: list[str],
+    request: Request,
+    pub_ids: List[UUID] = Body(..., min_length=1, max_length=settings.MAX_PUB_IDS_BATCH),
     db: Session = Depends(get_db),
     api_key: str | None = Depends(get_api_key_optional),
     current: Researcher | None = Depends(get_optional_current_researcher),
 ):
-    if not api_key and not current:
-        raise HTTPException(status_code=401, detail="Missing credentials")
-    validate_uuid_list(pub_ids)
+    _ensure_credentials(api_key, current)
+    _validate_pub_ids(pub_ids)
 
     pubs = db.query(Publication).filter(Publication.id.in_(pub_ids)).all()
-
     if not pubs:
+        _raise_clear_error_if_researcher_id_was_used(db, pub_ids)
         raise HTTPException(status_code=404, detail="No publications found")
 
     researcher = db.query(Researcher).filter_by(id=pubs[0].researcher_id).first()
 
     xml_bytes = SWORDGenerator.generate_feed_xml(researcher, pubs)
-    # Registrar descarga solo si hay usuario logueado
     if current:
-        for p in pubs:
-            exists = (
-                db.query(PublicationDownload)
-                .filter(
-                    PublicationDownload.researcher_id == current.id,
-                    PublicationDownload.publication_id == p.id,
-                )
-                .first()
-            )
-            if not exists:
-                db.add(PublicationDownload(researcher_id=current.id, publication_id=p.id))
-        db.commit()
+        _record_downloads(db, current, pubs)
+
     return Response(content=xml_bytes, media_type="application/xml")
 
 
+# ---------------------------------------------------------
+# ENDPOINT 2: SWORD por investigador
+# ---------------------------------------------------------
+
 @router.get("/sword/researcher/{orcid_id}")
+@limiter.limit(settings.RATE_LIMIT_EXPORT)
 async def export_researcher_sword(
-    orcid_id: str,
+    request: Request,
+    orcid_id: str = Path(min_length=19, max_length=19, pattern=ORCID_PATTERN),
     db: Session = Depends(get_db),
     api_key: str | None = Depends(get_api_key_optional),
     current: Researcher | None = Depends(get_optional_current_researcher),
 ):
-    if not api_key and not current:
-        raise HTTPException(status_code=401, detail="Missing credentials")
+    _ensure_credentials(api_key, current)
+    if not is_valid_orcid(orcid_id):
+        raise HTTPException(status_code=400, detail="Invalid ORCID iD")
+
     researcher = db.query(Researcher).filter_by(orcid_id=orcid_id).first()
     if not researcher:
         raise HTTPException(status_code=404, detail="Researcher not found")
 
     pubs = db.query(Publication).filter_by(researcher_id=researcher.id).all()
-
     if not pubs:
         raise HTTPException(status_code=404, detail="No publications found for this researcher")
 
     xml_bytes = SWORDGenerator.generate_feed_xml(researcher, pubs)
     if current:
-        for p in pubs:
-            exists = (
-                db.query(PublicationDownload)
-                .filter(
-                    PublicationDownload.researcher_id == current.id,
-                    PublicationDownload.publication_id == p.id,
-                )
-                .first()
-            )
-            if not exists:
-                db.add(PublicationDownload(researcher_id=current.id, publication_id=p.id))
-        db.commit()
+        _record_downloads(db, current, pubs)
+
     return Response(content=xml_bytes, media_type="application/xml")
 
 
+# ---------------------------------------------------------
+# ENDPOINT 3: ZIP múltiples publicaciones
+# ---------------------------------------------------------
+
 @router.post("/zip/publications")
+@limiter.limit(settings.RATE_LIMIT_EXPORT)
 async def export_multiple_zip(
-    pub_ids: list[str],
+    request: Request,
+    pub_ids: List[UUID] = Body(..., min_length=1, max_length=settings.MAX_PUB_IDS_BATCH),
     db: Session = Depends(get_db),
     api_key: str | None = Depends(get_api_key_optional),
     current: Researcher | None = Depends(get_optional_current_researcher),
 ):
-    if not api_key and not current:
-        raise HTTPException(status_code=401, detail="Missing credentials")
-    validate_uuid_list(pub_ids)
+    _ensure_credentials(api_key, current)
+    _validate_pub_ids(pub_ids)
 
     pubs = db.query(Publication).filter(Publication.id.in_(pub_ids)).all()
-
     if not pubs:
+        _raise_clear_error_if_researcher_id_was_used(db, pub_ids)
         raise HTTPException(status_code=404, detail="No publications found")
 
     researcher = db.query(Researcher).filter_by(id=pubs[0].researcher_id).first()
 
     zip_bytes = ZIPGenerator.generate_zip(researcher, pubs)
     if current:
-        for p in pubs:
-            exists = (
-                db.query(PublicationDownload)
-                .filter(
-                    PublicationDownload.researcher_id == current.id,
-                    PublicationDownload.publication_id == p.id,
-                )
-                .first()
-            )
-            if not exists:
-                db.add(PublicationDownload(researcher_id=current.id, publication_id=p.id))
-        db.commit()
+        _record_downloads(db, current, pubs)
+
     return Response(content=zip_bytes, media_type="application/zip")
 
 
+# ---------------------------------------------------------
+# ENDPOINT 4: ZIP por investigador
+# ---------------------------------------------------------
+
 @router.get("/zip/researcher/{orcid_id}")
+@limiter.limit(settings.RATE_LIMIT_EXPORT)
 async def export_researcher_zip(
-    orcid_id: str,
+    request: Request,
+    orcid_id: str = Path(min_length=19, max_length=19, pattern=ORCID_PATTERN),
     db: Session = Depends(get_db),
     api_key: str | None = Depends(get_api_key_optional),
     current: Researcher | None = Depends(get_optional_current_researcher),
 ):
-    if not api_key and not current:
-        raise HTTPException(status_code=401, detail="Missing credentials")
+    _ensure_credentials(api_key, current)
+    if not is_valid_orcid(orcid_id):
+        raise HTTPException(status_code=400, detail="Invalid ORCID iD")
+
     researcher = db.query(Researcher).filter_by(orcid_id=orcid_id).first()
     if not researcher:
         raise HTTPException(status_code=404, detail="Researcher not found")
 
     pubs = db.query(Publication).filter_by(researcher_id=researcher.id).all()
-
     if not pubs:
         raise HTTPException(status_code=404, detail="No publications found for this researcher")
 
     zip_bytes = ZIPGenerator.generate_zip(researcher, pubs)
     if current:
-        for p in pubs:
-            exists = (
-                db.query(PublicationDownload)
-                .filter(
-                    PublicationDownload.researcher_id == current.id,
-                    PublicationDownload.publication_id == p.id,
-                )
-                .first()
-            )
-            if not exists:
-                db.add(PublicationDownload(researcher_id=current.id, publication_id=p.id))
-        db.commit()
+        _record_downloads(db, current, pubs)
+
     return Response(content=zip_bytes, media_type="application/zip")

backend/app/api/researchers.py

@@ -2,11 +2,14 @@ from datetime import datetime
 from typing import List
 
 import httpx
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import APIRouter, Depends, HTTPException, Path, Request
 from sqlalchemy.orm import Session
 
-from app.db.models import Publication, Researcher
+from app.core.config import settings
+from app.core.rate_limit import limiter
+from app.db.models import Publication, PublicationDownload, Researcher
 from app.db.session import get_db
+from app.schema.publication import PublicationSchema
 from app.schema.researcher import (
     ResearcherBatchSearchRequestSchema,
     ResearcherBatchSearchResponseSchema,
@@ -14,18 +17,15 @@ from app.schema.researcher import (
     ResearcherStatsSchema,
     ResearcherWithPublicationsSchema,
 )
-from app.services.normalizer import PublicationNormalizer
-from app.services.orcid_client import get_display_name, get_works_summary, get_work_detail
-from app.schema.publication import PublicationSchema
-from app.db.models import PublicationDownload
 from app.security.jwt import get_optional_current_researcher
+from app.services.normalizer import PublicationNormalizer
+from app.services.orcid_client import get_display_name, get_work_detail, get_works_summary
+from app.utils.orcid_validator import ORCID_PATTERN, is_valid_orcid
+
 
 router = APIRouter(prefix="/researchers", tags=["researchers"])
 
 
-# ---------------------------------------------------------
-# Función auxiliar: detectar si una publicación ha cambiado
-# ---------------------------------------------------------
 def publication_changed(existing: Publication, data: dict) -> bool:
     fields = [
         "title", "subtitle", "type", "journal",
@@ -33,18 +33,13 @@ def publication_changed(existing: Publication, data: dict) -> bool:
         "doi", "url", "short_description",
         "citation_type", "citation_value",
         "language_code", "country",
-        "external_ids", "contributors"
+        "external_ids", "contributors",
     ]
-
-    for f in fields:
-        if getattr(existing, f) != data[f]:
-            return True
-    return False
+    return any(getattr(existing, f) != data[f] for f in fields)
 
 
 def build_researcher_stats(publications: list) -> ResearcherStatsSchema:
     publication_types: dict[str, int] = {}
-
     for publication in publications:
         pub_type = getattr(publication, "type", None) or "unknown"
         publication_types[pub_type] = publication_types.get(pub_type, 0) + 1
@@ -98,7 +93,7 @@ def _upsert_researcher_publications(
                 "doi", "url", "short_description",
                 "citation_type", "citation_value",
                 "language_code", "country",
-                "external_ids", "contributors"
+                "external_ids", "contributors",
             ]:
                 setattr(existing, field, data[field])
             existing.last_modified = datetime.utcnow()
@@ -142,12 +137,17 @@ def _decorate_downloaded_by_me(
     out: List[PublicationSchema] = []
     for p in publications:
         out.append(
-            PublicationSchema.model_validate(p).model_copy(update={"downloaded_by_me": p.id in downloaded_ids})
+            PublicationSchema.model_validate(p).model_copy(
+                update={"downloaded_by_me": p.id in downloaded_ids}
+            )
         )
     return out
 
 
 def build_search_response(orcid_id: str, db: Session, current: Researcher | None) -> ResearcherWithPublicationsSchema:
+    if not is_valid_orcid(orcid_id):
+        raise HTTPException(status_code=400, detail="Invalid ORCID iD")
+
     researcher = db.query(Researcher).filter(Researcher.orcid_id == orcid_id).first()
     if not researcher:
         researcher = Researcher(
@@ -159,10 +159,6 @@ def build_search_response(orcid_id: str, db: Session, current: Researcher | None
         db.add(researcher)
         db.flush()
 
-    # Si todavía no conocemos el nombre del investigador (por ejemplo, recién
-    # creado al sincronizarse desde el buscador), lo resolvemos contra el
-    # endpoint `/record` público de ORCID. No tocamos un nombre ya existente
-    # para no pisar valores establecidos por el flujo de autenticación.
     if not researcher.name:
         display_name = get_display_name(orcid_id)
         if display_name:
@@ -185,10 +181,18 @@ def build_search_response(orcid_id: str, db: Session, current: Researcher | None
 
 
 # ---------------------------------------------------------
-# ENDPOINT 1: SEARCH + SYNC (sin contadores)
+# ENDPOINT 1: SEARCH + SYNC
 # ---------------------------------------------------------
-@router.post("/search", response_model=ResearcherBatchSearchResponseSchema, response_model_exclude_none=True)
+
+
+@router.post(
+    "/search",
+    response_model=ResearcherBatchSearchResponseSchema,
+    response_model_exclude_none=True,
+)
+@limiter.limit(settings.RATE_LIMIT_SEARCH_ANON)
 def search_and_sync_researchers(
+    request: Request,
     payload: ResearcherBatchSearchRequestSchema,
     db: Session = Depends(get_db),
     current: Researcher | None = Depends(get_optional_current_researcher),
@@ -196,26 +200,33 @@ def search_and_sync_researchers(
     results: List[ResearcherWithPublicationsSchema] = []
     errors: List[ResearcherSearchErrorSchema] = []
 
-    # Evita llamadas duplicadas a ORCID conservando el orden de entrada.
     unique_orcid_ids = list(dict.fromkeys(payload.orcid_ids))
 
     for orcid_id in unique_orcid_ids:
         try:
             results.append(build_search_response(orcid_id, db, current))
+        except HTTPException as exc:
+            db.rollback()
+            errors.append(
+                ResearcherSearchErrorSchema(
+                    orcid_id=orcid_id,
+                    detail=str(exc.detail),
+                )
+            )
         except httpx.HTTPStatusError as exc:
             db.rollback()
             errors.append(
                 ResearcherSearchErrorSchema(
                     orcid_id=orcid_id,
-                    detail=f"ORCID devolvió {exc.response.status_code} para {orcid_id}.",
+                    detail=f"ORCID returned {exc.response.status_code}",
                 )
             )
-        except Exception as exc:
+        except Exception:
             db.rollback()
             errors.append(
                 ResearcherSearchErrorSchema(
                     orcid_id=orcid_id,
-                    detail=str(exc),
+                    detail="Unexpected error while processing ORCID iD",
                 )
             )
 
@@ -228,14 +239,24 @@ def search_and_sync_researchers(
 
 
 # ---------------------------------------------------------
-# ENDPOINT 2: SYNC COMPLETO (con contadores + status)
+# ENDPOINT 2: SYNC COMPLETO (requiere autenticación)
 # ---------------------------------------------------------
-@router.post("/{orcid_id}/sync", response_model=ResearcherWithPublicationsSchema, response_model_exclude_none=True)
+
+@router.post(
+    "/{orcid_id}/sync",
+    response_model=ResearcherWithPublicationsSchema,
+    response_model_exclude_none=True,
+)
+@limiter.limit(settings.RATE_LIMIT_SYNC)
 def sync_researcher(
-    orcid_id: str,
+    request: Request,
+    orcid_id: str = Path(min_length=19, max_length=19, pattern=ORCID_PATTERN),
     db: Session = Depends(get_db),
     current: Researcher | None = Depends(get_optional_current_researcher),
 ):
+    if not is_valid_orcid(orcid_id):
+        raise HTTPException(status_code=400, detail="Invalid ORCID iD")
+
     researcher = db.query(Researcher).filter_by(orcid_id=orcid_id).first()
     if not researcher:
         raise HTTPException(status_code=404, detail="Researcher not found")
@@ -244,7 +265,6 @@ def sync_researcher(
     groups = works.get("group", [])
 
     publications_output = []
-
     new_count = 0
     updated_count = 0
     unchanged_count = 0
@@ -277,21 +297,17 @@ def sync_researcher(
 
         if existing:
             if publication_changed(existing, data):
-                # updated
                 for field in data:
                     setattr(existing, field, data[field])
                 existing.last_modified = datetime.utcnow()
                 existing.status = "updated"
                 updated_count += 1
             else:
-                # unchanged
                 existing.status = "unchanged"
                 unchanged_count += 1
 
             pub = existing
-
         else:
-            # new
             pub = Publication(
                 researcher_id=researcher.id,
                 **data,

backend/app/core/body_size.py

@@ -0,0 +1,35 @@
+"""
+Middleware que limita el tamaño máximo del cuerpo de la petición.
+
+Evita ataques de agotamiento de memoria/CPU enviando bodies enormes a
+endpoints POST. Se aplica antes de que FastAPI deserialice el JSON.
+"""
+
+from __future__ import annotations
+
+from starlette.middleware.base import BaseHTTPMiddleware
+from starlette.requests import Request
+from starlette.responses import JSONResponse, Response
+
+
+class BodySizeLimitMiddleware(BaseHTTPMiddleware):
+    def __init__(self, app, *, max_bytes: int):
+        super().__init__(app)
+        self._max_bytes = max_bytes
+
+    async def dispatch(self, request: Request, call_next) -> Response:
+        content_length = request.headers.get("content-length")
+        if content_length is not None:
+            try:
+                if int(content_length) > self._max_bytes:
+                    return JSONResponse(
+                        status_code=413,
+                        content={"detail": "Request body too large"},
+                    )
+            except ValueError:
+                return JSONResponse(
+                    status_code=400,
+                    content={"detail": "Invalid Content-Length header"},
+                )
+
+        return await call_next(request)

backend/app/core/config.py

@@ -0,0 +1,183 @@
+"""
+Configuración tipada y validada del backend.
+
+Centraliza la lectura de variables de entorno, valida secretos críticos al
+arranque y evita fallbacks inseguros (p. ej. JWT_SECRET="change_me") en
+entornos productivos.
+"""
+
+from __future__ import annotations
+
+import os
+from functools import lru_cache
+from pathlib import Path
+from typing import List, Literal
+from urllib.parse import urlparse
+
+from dotenv import load_dotenv
+from pydantic import Field, field_validator, model_validator
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+_ENV_PATH = Path(__file__).resolve().parents[2] / ".env"
+load_dotenv(dotenv_path=_ENV_PATH, override=False)
+
+
+def _split_csv(value: str | List[str] | None) -> List[str]:
+    if value is None:
+        return []
+    if isinstance(value, list):
+        return [str(v).strip().rstrip("/") for v in value if str(v).strip()]
+    return [v.strip().rstrip("/") for v in value.split(",") if v.strip()]
+
+
+class Settings(BaseSettings):
+    """
+    Settings inmutables para toda la aplicación.
+
+    En `production` se aplican validaciones más estrictas:
+    - JWT_SECRET no puede ser un valor débil ni por defecto.
+    - CORS_ALLOWED_ORIGINS no puede contener "*".
+    - Se exige ORCID_CLIENT_ID/SECRET y API_KEY_VALUE.
+    """
+
+    model_config = SettingsConfigDict(
+        env_file=str(_ENV_PATH),
+        env_file_encoding="utf-8",
+        extra="ignore",
+        case_sensitive=False,
+    )
+
+    ENVIRONMENT: Literal["development", "staging", "production"] = "development"
+    DEBUG: bool = False
+
+    DATABASE_URL: str = Field(...)
+    REDIS_URL: str | None = None
+    BASE_URL: str = "http://localhost:8000/api"
+
+    JWT_SECRET: str = Field(...)
+    JWT_ALGORITHM: str = "HS256"
+    JWT_EXPIRES_MINUTES: int = 720
+    JWT_ISSUER: str = "orcid-sword-backend"
+    JWT_AUDIENCE: str = "orcid-sword-frontend"
+
+    API_KEY_NAME: str = "X-API-Key"
+    API_KEY_VALUE: str = Field(...)
+
+    ORCID_CLIENT_ID: str = Field(...)
+    ORCID_CLIENT_SECRET: str = Field(...)
+    ORCID_REDIRECT_URI: str = "http://localhost:8000/api/auth/orcid/callback"
+    ORCID_OAUTH_STATE_ENABLED: bool = True
+    ORCID_OAUTH_STATE_COOKIE: str = "orcid_oauth_state"
+    ORCID_OAUTH_STATE_TTL_SECONDS: int = 600
+
+    CORS_ALLOWED_ORIGINS: str = ""
+
+    TRUSTED_HOSTS: str = "*"
+
+    RATE_LIMIT_DEFAULT: str = "60/minute"
+    RATE_LIMIT_AUTH: str = "10/minute"
+    RATE_LIMIT_SEARCH_ANON: str = "5/minute"
+    RATE_LIMIT_SEARCH_AUTH: str = "30/minute"
+    RATE_LIMIT_EXPORT: str = "20/minute"
+    RATE_LIMIT_SYNC: str = "5/minute"
+
+    MAX_ORCID_BATCH: int = 25
+    MAX_PUB_IDS_BATCH: int = 500
+    MAX_REQUEST_BODY_BYTES: int = 1_048_576  # 1 MiB
+
+    DOCS_ENABLED: bool = True
+
+    SECURITY_HSTS_SECONDS: int = 31_536_000
+    SECURITY_HSTS_INCLUDE_SUBDOMAINS: bool = True
+    SECURITY_HSTS_PRELOAD: bool = False
+
+    @model_validator(mode="after")
+    def _validate_security(self) -> "Settings":
+        cors_origins = self.cors_allowed_origins
+        trusted_hosts = self.trusted_hosts
+
+        if self.ENVIRONMENT == "production":
+            weak = {"change_me", "changeme", "secret", "password", ""}
+            if self.JWT_SECRET.strip().lower() in weak:
+                raise ValueError(
+                    "JWT_SECRET es débil o está sin configurar. "
+                    "Define un secreto aleatorio fuerte (>= 32 bytes)."
+                )
+            if len(self.JWT_SECRET) < 32:
+                raise ValueError(
+                    "JWT_SECRET debe tener al menos 32 caracteres en producción."
+                )
+            if "*" in cors_origins:
+                raise ValueError(
+                    "CORS_ALLOWED_ORIGINS no puede contener '*' en producción."
+                )
+            if not cors_origins:
+                raise ValueError(
+                    "CORS_ALLOWED_ORIGINS debe definirse explícitamente en producción."
+                )
+            if not self.API_KEY_VALUE or len(self.API_KEY_VALUE) < 24:
+                raise ValueError(
+                    "API_KEY_VALUE debe tener al menos 24 caracteres en producción."
+                )
+            if trusted_hosts == ["*"]:
+                raise ValueError(
+                    "TRUSTED_HOSTS debe definirse explícitamente en producción."
+                )
+
+        for origin in cors_origins:
+            parsed = urlparse(origin)
+            if parsed.scheme not in {"http", "https"} or not parsed.netloc:
+                raise ValueError(f"Origen CORS inválido: {origin!r}")
+
+        return self
+
+    @property
+    def is_production(self) -> bool:
+        return self.ENVIRONMENT == "production"
+
+    @property
+    def cors_allowed_origins(self) -> List[str]:
+        return _split_csv(self.CORS_ALLOWED_ORIGINS)
+
+    @property
+    def trusted_hosts(self) -> List[str]:
+        parsed = _split_csv(self.TRUSTED_HOSTS)
+        return parsed or ["*"]
+
+    @property
+    def docs_url(self) -> str | None:
+        return "/docs" if self.DOCS_ENABLED else None
+
+    @property
+    def redoc_url(self) -> str | None:
+        return "/redoc" if self.DOCS_ENABLED else None
+
+    @property
+    def openapi_url(self) -> str | None:
+        return "/openapi.json" if self.DOCS_ENABLED else None
+
+
+@lru_cache(maxsize=1)
+def get_settings() -> Settings:
+    """
+    Devuelve la instancia única de configuración.
+
+    Se cachea para no releer entorno/archivos en cada request.
+    """
+    return Settings()  # type: ignore[call-arg]
+
+
+settings = get_settings()
+
+
+def reload_settings_for_tests() -> Settings:
+    """
+    Helper para tests: invalida la caché y recarga settings.
+    """
+    get_settings.cache_clear()
+    globals()["settings"] = get_settings()
+    return globals()["settings"]
+
+
+__all__ = ["Settings", "get_settings", "reload_settings_for_tests", "settings"]

backend/app/core/error_handlers.py

@@ -0,0 +1,67 @@
+"""
+Manejadores de errores que NO filtran información sensible.
+
+- En producción, las excepciones no controladas devuelven un mensaje genérico.
+- En desarrollo, se incluye `type` para depurar (sin trazas).
+- Errores de validación se devuelven con 422 estándar de FastAPI.
+"""
+
+from __future__ import annotations
+
+import logging
+import uuid
+
+from fastapi import HTTPException, Request
+from fastapi.exceptions import RequestValidationError
+from fastapi.responses import JSONResponse
+from sqlalchemy.exc import SQLAlchemyError
+
+from app.core.config import settings
+
+
+logger = logging.getLogger("app.error")
+
+
+async def http_exception_handler(request: Request, exc: HTTPException) -> JSONResponse:
+    return JSONResponse(
+        status_code=exc.status_code,
+        content={"detail": exc.detail},
+        headers=getattr(exc, "headers", None),
+    )
+
+
+async def validation_exception_handler(
+    request: Request, exc: RequestValidationError
+) -> JSONResponse:
+    safe_errors = []
+    for err in exc.errors():
+        safe_errors.append(
+            {
+                "loc": err.get("loc"),
+                "msg": err.get("msg"),
+                "type": err.get("type"),
+            }
+        )
+    return JSONResponse(status_code=422, content={"detail": safe_errors})
+
+
+async def sqlalchemy_exception_handler(
+    request: Request, exc: SQLAlchemyError
+) -> JSONResponse:
+    error_id = str(uuid.uuid4())
+    logger.exception("DB error [%s] on %s %s", error_id, request.method, request.url.path)
+    return JSONResponse(
+        status_code=500,
+        content={"detail": "Database error", "error_id": error_id},
+    )
+
+
+async def unhandled_exception_handler(request: Request, exc: Exception) -> JSONResponse:
+    error_id = str(uuid.uuid4())
+    logger.exception(
+        "Unhandled error [%s] on %s %s", error_id, request.method, request.url.path
+    )
+    payload: dict = {"detail": "Internal server error", "error_id": error_id}
+    if not settings.is_production and settings.DEBUG:
+        payload["type"] = exc.__class__.__name__
+    return JSONResponse(status_code=500, content=payload)

backend/app/core/logging_config.py

@@ -0,0 +1,28 @@
+"""
+Configuración de logging estructurada y minimalista.
+
+- Formatea con timestamp, nivel y logger.
+- En producción usa nivel INFO; en desarrollo DEBUG.
+- Silencia logs ruidosos de librerías externas para no filtrar headers.
+"""
+
+from __future__ import annotations
+
+import logging
+
+from app.core.config import settings
+
+
+_LOG_FORMAT = "%(asctime)s %(levelname)s %(name)s :: %(message)s"
+
+
+def configure_logging() -> None:
+    level = logging.DEBUG if settings.DEBUG else logging.INFO
+
+    logging.basicConfig(level=level, format=_LOG_FORMAT)
+
+    for noisy in ("httpx", "httpcore", "sqlalchemy.engine.Engine"):
+        logging.getLogger(noisy).setLevel(logging.WARNING)
+
+    logging.getLogger("uvicorn.error").setLevel(level)
+    logging.getLogger("uvicorn.access").setLevel(logging.WARNING)

backend/app/core/rate_limit.py

@@ -0,0 +1,66 @@
+"""
+Rate limiting basado en SlowAPI.
+
+- Usa Redis como backend si `REDIS_URL` está definido (compartido entre workers).
+- Cae a memoria local en desarrollo si Redis no está disponible.
+- Identifica al cliente por IP y, cuando hay JWT, también por `sub` (orcid_id),
+  para que un atacante autenticado no comparta cupo con su IP.
+"""
+
+from __future__ import annotations
+
+from typing import Optional
+
+from slowapi import Limiter
+from slowapi.errors import RateLimitExceeded
+from slowapi.util import get_remote_address
+from starlette.requests import Request
+from starlette.responses import JSONResponse
+
+from app.core.config import settings
+
+
+def _key_func(request: Request) -> str:
+    """
+    Devuelve la clave de rate limit para el request.
+
+    - Si hay un investigador autenticado en el state, usa su orcid_id.
+    - Si hay cabecera X-Forwarded-For (ngrok, nginx, cualquier proxy inverso),
+      usa la primera IP de la cadena (la del cliente real).
+    - En caso contrario, usa la IP remota del socket.
+    """
+    researcher = getattr(request.state, "researcher", None)
+    if researcher is not None:
+        return f"user:{getattr(researcher, 'orcid_id', None) or researcher.id}"
+    forwarded_for = request.headers.get("x-forwarded-for")
+    if forwarded_for:
+        client_ip = forwarded_for.split(",")[0].strip()
+        return f"ip:{client_ip}"
+    return f"ip:{get_remote_address(request)}"
+
+
+def _build_limiter() -> Limiter:
+    storage_uri: Optional[str] = settings.REDIS_URL
+    return Limiter(
+        key_func=_key_func,
+        default_limits=[settings.RATE_LIMIT_DEFAULT],
+        storage_uri=storage_uri,
+        headers_enabled=False,
+        strategy="fixed-window",
+    )
+
+
+limiter = _build_limiter()
+
+
+def rate_limit_exceeded_handler(request: Request, exc: RateLimitExceeded) -> JSONResponse:
+    """
+    Respuesta uniforme cuando se supera el límite.
+
+    No revela límites internos exactos para reducir oráculo a atacantes.
+    """
+    return JSONResponse(
+        status_code=429,
+        content={"detail": "Too many requests, slow down."},
+        headers={"Retry-After": "60"},
+    )

backend/app/core/security_headers.py

@@ -0,0 +1,75 @@
+from __future__ import annotations
+
+from starlette.middleware.base import BaseHTTPMiddleware
+from starlette.requests import Request
+from starlette.responses import Response
+
+from app.core.config import Settings
+
+
+_DOCS_PATHS = ("/docs", "/redoc", "/openapi.json")
+
+_BASE_CSP = (
+    "default-src 'none'; "
+    "frame-ancestors 'none'; "
+    "base-uri 'none'; "
+    "form-action 'none'"
+)
+
+_SWAGGER_CSP = (
+    "default-src 'self'; "
+    "img-src 'self' data: https://fastapi.tiangolo.com; "
+    "script-src 'self' https://cdn.jsdelivr.net 'unsafe-inline'; "
+    "style-src 'self' https://cdn.jsdelivr.net 'unsafe-inline'; "
+    "font-src 'self' data: https://cdn.jsdelivr.net; "
+    "connect-src 'self'; "
+    "frame-ancestors 'none'; "
+    "base-uri 'self'; "
+    "form-action 'self'"
+)
+
+
+class SecurityHeadersMiddleware(BaseHTTPMiddleware):
+    """
+    Inserta cabeceras de seguridad en cada respuesta.
+    """
+
+    def __init__(self, app, settings: Settings):
+        super().__init__(app)
+        self._settings = settings
+
+    async def dispatch(self, request: Request, call_next) -> Response:
+        response: Response = await call_next(request)
+
+        response.headers.setdefault("X-Content-Type-Options", "nosniff")
+        response.headers.setdefault("X-Frame-Options", "DENY")
+        response.headers.setdefault("Referrer-Policy", "strict-origin-when-cross-origin")
+        response.headers.setdefault(
+            "Permissions-Policy",
+            "geolocation=(), microphone=(), camera=(), payment=(), usb=(), "
+            "accelerometer=(), gyroscope=(), magnetometer=(), interest-cohort=()",
+        )
+       
+        response.headers.setdefault("Cross-Origin-Opener-Policy", "same-origin-allow-popups")
+        response.headers.setdefault("Cross-Origin-Resource-Policy", "same-site")
+        response.headers.setdefault("X-Permitted-Cross-Domain-Policies", "none")
+
+        if request.url.path in _DOCS_PATHS:
+            response.headers.setdefault("Content-Security-Policy", _SWAGGER_CSP)
+        else:
+            response.headers.setdefault("Content-Security-Policy", _BASE_CSP)
+
+        if request.url.scheme == "https" or self._settings.is_production:
+            hsts = f"max-age={self._settings.SECURITY_HSTS_SECONDS}"
+            if self._settings.SECURITY_HSTS_INCLUDE_SUBDOMAINS:
+                hsts += "; includeSubDomains"
+            if self._settings.SECURITY_HSTS_PRELOAD:
+                hsts += "; preload"
+            response.headers.setdefault("Strict-Transport-Security", hsts)
+
+        if "server" in response.headers:
+            del response.headers["server"]
+        if "x-powered-by" in response.headers:
+            del response.headers["x-powered-by"]
+
+        return response

backend/app/db/base.py

@@ -1,3 +1,7 @@
 from sqlalchemy.orm import declarative_base
 
+# ---------------------------------------------------------
+# Base de datos
+# ---------------------------------------------------------
+
 Base = declarative_base()

backend/app/db/models.py

@@ -6,6 +6,9 @@ from datetime import datetime
 
 from app.db.session import Base
 
+# ---------------------------------------------------------
+# Modelo de investigador
+# ---------------------------------------------------------
 
 class Researcher(Base):
     __tablename__ = "researchers"
@@ -18,6 +21,9 @@ class Researcher(Base):
 
     publications = relationship("Publication", back_populates="researcher", cascade="all, delete-orphan")
 
+# ---------------------------------------------------------
+# Modelo de publicación
+# ---------------------------------------------------------
 
 class Publication(Base):
     __tablename__ = "publications"
@@ -65,6 +71,9 @@ class Publication(Base):
     # Legacy: descargado global (deprecado). Mantener por compatibilidad de DB.
     downloaded = Column(Boolean, nullable=False, default=False)
 
+# ---------------------------------------------------------
+# Modelo de descarga de publicación
+# ---------------------------------------------------------
 
 class PublicationDownload(Base):
     """

backend/app/db/repositories/publication_repository.py

@@ -1,8 +1,16 @@
 from sqlalchemy.orm import Session
 from app.db.models import Publication
 
+# ---------------------------------------------------------
+# Repositorio de publicaciones
+# ---------------------------------------------------------
+
 class PublicationRepository:
 
+    # ---------------------------------------------------------
+    # Función auxiliar: obtener publicación por put_code
+    # ---------------------------------------------------------
+
     @staticmethod
     def get_by_put_code(db: Session, researcher_id: str, put_code: int):
         """
@@ -17,6 +25,10 @@ class PublicationRepository:
             .first()
         )
 
+    # ---------------------------------------------------------
+    # Función auxiliar: crear una nueva publicación
+    # ---------------------------------------------------------
+
     @staticmethod
     def create(db: Session, researcher_id: str, data: dict):
         """
@@ -37,6 +49,10 @@ class PublicationRepository:
         db.refresh(pub)
         return pub
 
+    # ---------------------------------------------------------
+    # Función auxiliar: actualizar una publicación existente
+    # ---------------------------------------------------------
+
     @staticmethod
     def update(db: Session, publication: Publication, data: dict):
         """
@@ -53,6 +69,10 @@ class PublicationRepository:
         db.refresh(publication)
         return publication
 
+    # ---------------------------------------------------------
+    # Función auxiliar: listar publicaciones de un investigador
+    # ---------------------------------------------------------
+
     @staticmethod
     def list_by_researcher(db: Session, researcher_id: str):
         """

backend/app/db/repositories/researcher_repository.py

@@ -2,13 +2,24 @@ from sqlalchemy.orm import Session
 from app.db.models import Researcher
 from sqlalchemy.sql import func
 
+# ---------------------------------------------------------
+# Repositorio de investigadores
+# ---------------------------------------------------------
 
 class ResearcherRepository:
 
+    # ---------------------------------------------------------
+    # Función auxiliar: obtener investigador por ORCID ID
+    # ---------------------------------------------------------
+
     @staticmethod
     def get_by_orcid(db: Session, orcid_id: str):
         return db.query(Researcher).filter(Researcher.orcid_id == orcid_id).first()
 
+    # ---------------------------------------------------------
+    # Función auxiliar: crear un nuevo investigador
+    # ---------------------------------------------------------
+
     @staticmethod
     def create(db: Session, orcid_id: str, name: str = None):
         researcher = Researcher(orcid_id=orcid_id, name=name)
@@ -17,6 +28,10 @@ class ResearcherRepository:
         db.refresh(researcher)
         return researcher
 
+    # ---------------------------------------------------------
+    # Función auxiliar: actualizar la última sincronización
+    # ---------------------------------------------------------
+
     @staticmethod
     def update_last_sync(db: Session, researcher: Researcher):
         researcher.last_sync_at = func.now()

backend/app/db/repositories/syncjob_repository.py

@@ -2,9 +2,16 @@ from sqlalchemy.orm import Session
 from app.db.models import SyncJob
 from sqlalchemy.sql import func
 
+# ---------------------------------------------------------
+# Repositorio de trabajos de sincronización
+# ---------------------------------------------------------
 
 class SyncJobRepository:
 
+    # ---------------------------------------------------------
+    # Función auxiliar: iniciar un nuevo trabajo de sincronización
+    # ---------------------------------------------------------
+
     @staticmethod
     def start_job(db: Session, researcher_id: str):
         job = SyncJob(
@@ -17,6 +24,10 @@ class SyncJobRepository:
         db.refresh(job)
         return job
 
+    # ---------------------------------------------------------
+    # Función auxiliar: finalizar un trabajo de sincronización
+    # ---------------------------------------------------------
+
     @staticmethod
     def finish_job(db: Session, job: SyncJob, new_records: int, updated_records: int):
         job.status = "finished"

backend/app/db/session.py

@@ -9,6 +9,7 @@ load_dotenv()
 # -----------------------------
 # DATABASE URL
 # -----------------------------
+
 DATABASE_URL = os.getenv("DATABASE_URL")
 
 engine = create_engine(
@@ -29,6 +30,7 @@ Base = declarative_base()
 # -----------------------------
 # DB SESSION DEPENDENCY
 # -----------------------------
+
 def get_db():
     db = SessionLocal()
     try:
@@ -40,17 +42,25 @@ def get_db():
 # -----------------------------
 # INIT DB (CREA TABLAS)
 # -----------------------------
+
 def init_db():
+
     # Importa modelos para que SQLAlchemy los registre
+
     import app.db.models  # noqa
 
     # Crea todas las tablas si no existen
+
     Base.metadata.create_all(bind=engine)
 
     # Pequeñas migraciones "best-effort" para entornos sin Alembic.
     # (create_all no altera tablas existentes)
+
     _ensure_columns()
 
+# ---------------------------------------------------------
+# Función auxiliar: asegurar columnas existentes
+# ---------------------------------------------------------
 
 def _ensure_columns():
     insp = inspect(engine)

backend/app/main.py

@@ -1,68 +1,154 @@
-from fastapi import Depends, FastAPI
+"""
+Entry point del backend FastAPI.
+
+Aplica un perfil de seguridad por defecto:
+- Configuración tipada (Pydantic Settings) que falla rápido en producción.
+- TrustedHostMiddleware (anti Host-header injection).
+- CORS con lista blanca estricta (sin `*`).
+- Body size limit (anti DoS por payload).
+- Cabeceras de seguridad HTTP.
+- Rate limiting (slowapi) con backend Redis si está configurado.
+- Error handlers que NO filtran trazas ni internals.
+"""
+
+from __future__ import annotations
+
+import logging
+
+from fastapi import Depends, FastAPI, HTTPException, Request
+from fastapi.exceptions import RequestValidationError
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.middleware.trustedhost import TrustedHostMiddleware
+from slowapi.errors import RateLimitExceeded
+from sqlalchemy.exc import SQLAlchemyError
 from sqlalchemy.orm import Session
 
-from app.db.session import init_db
-from app.db.session import get_db
-from app.api.researchers import router as researchers_router
+from app.api.auth import complete_oauth_login_response, router as auth_router
 from app.api.export import router as export_router
-from app.api.auth import router as auth_router
-from app.api.auth import _complete_oauth_login
-from app.schema.auth import OrcidLoginResponseSchema
+from app.api.researchers import router as researchers_router
+from app.core.body_size import BodySizeLimitMiddleware
+from app.core.config import settings
+from app.core.error_handlers import (
+    http_exception_handler,
+    sqlalchemy_exception_handler,
+    unhandled_exception_handler,
+    validation_exception_handler,
+)
+from app.core.logging_config import configure_logging
+from app.core.rate_limit import limiter, rate_limit_exceeded_handler
+from app.core.security_headers import SecurityHeadersMiddleware
+from app.db.session import get_db, init_db
 from app.scheduler.sync_scheduler import start_scheduler
+from app.schema.auth import OrcidLoginResponseSchema
+
+
+configure_logging()
+logger = logging.getLogger("app.main")
 
 
-# ---------------------------------------------------------
-# Crear instancia principal de FastAPI
-# ---------------------------------------------------------
 app = FastAPI(
     title="ORCID SWORD Backend",
     description="Backend para sincronización ORCID y exportación SWORD",
-    version="1.0.0"
+    version="1.0.0",
+    docs_url=settings.docs_url,
+    redoc_url=settings.redoc_url,
+    openapi_url=settings.openapi_url,
 )
 
 
 # ---------------------------------------------------------
-# Crear tablas al iniciar la aplicación
+# Middlewares (orden importa: el último añadido es el más externo)
 # ---------------------------------------------------------
+
+app.state.limiter = limiter
+app.add_exception_handler(RateLimitExceeded, rate_limit_exceeded_handler)
+
+app.add_middleware(SecurityHeadersMiddleware, settings=settings)
+
+app.add_middleware(
+    BodySizeLimitMiddleware,
+    max_bytes=settings.MAX_REQUEST_BODY_BYTES,
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=settings.cors_allowed_origins,
+    allow_credentials=True,
+    allow_methods=["GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"],
+    allow_headers=[
+        "Authorization",
+        "Content-Type",
+        "Accept",
+        "Origin",
+        "X-Requested-With",
+        settings.API_KEY_NAME,
+    ],
+    expose_headers=["Content-Disposition", "X-RateLimit-Remaining", "X-RateLimit-Reset"],
+    max_age=600,
+)
+
+app.add_middleware(
+    TrustedHostMiddleware,
+    allowed_hosts=settings.trusted_hosts,
+)
+
+
+# ---------------------------------------------------------
+# Exception handlers
+# ---------------------------------------------------------
+
+app.add_exception_handler(HTTPException, http_exception_handler)
+app.add_exception_handler(RequestValidationError, validation_exception_handler)
+app.add_exception_handler(SQLAlchemyError, sqlalchemy_exception_handler)
+app.add_exception_handler(Exception, unhandled_exception_handler)
+
+
+# ---------------------------------------------------------
+# Lifecycle
+# ---------------------------------------------------------
+
 @app.on_event("startup")
-def startup_event():
-    init_db()          # 🔥 CREA TABLAS
-    start_scheduler()  # 🔥 INICIA SCHEDULER
+def on_startup() -> None:
+    init_db()
+    start_scheduler()
+    logger.info(
+        "Backend ready (env=%s, docs=%s)",
+        settings.ENVIRONMENT,
+        bool(settings.DOCS_ENABLED),
+    )
 
 
 # ---------------------------------------------------------
 # Healthcheck
 # ---------------------------------------------------------
+
 @app.get("/health")
-def health():
+def health() -> dict[str, str]:
     return {"status": "ok"}
 
 
+# ---------------------------------------------------------
+# Alias del callback OAuth (mismo flujo, mismo endurecimiento)
+# ---------------------------------------------------------
+
 @app.get("/callback", response_model=OrcidLoginResponseSchema)
-def oauth_callback_root(code: str, db: Session = Depends(get_db)):
+def oauth_callback_root(
+    request: Request,
+    code: str,
+    state: str | None = None,
+    db: Session = Depends(get_db),
+):
     """
-    Alias para probar redirect URIs como `https://127.0.0.1/callback` en local.
-    Intercambia el code con ORCID y emite el JWT.
+    Alias para integraciones que registran un redirect_uri tipo
+    `https://<host>/callback` en ORCID.
     """
-    return _complete_oauth_login(code=code, db=db)
+    return complete_oauth_login_response(request=request, code=code, state=state, db=db)
 
 
 # ---------------------------------------------------------
-# Registrar routers
+# Routers
 # ---------------------------------------------------------
+
 app.include_router(researchers_router, prefix="/api")
 app.include_router(export_router, prefix="/api")
 app.include_router(auth_router, prefix="/api")
-
-
-# ---------------------------------------------------------
-# CORS
-# ---------------------------------------------------------
-app.add_middleware(
-    CORSMiddleware,
-    allow_origins=["*"],  # en producción limitar
-    allow_credentials=True,
-    allow_methods=["*"],
-    allow_headers=["*"],
-)

backend/app/scheduler/sync_scheduler.py

@@ -9,9 +9,16 @@ import os
 # Cargar variables del .env
 load_dotenv()
 
+# ---------------------------------------------------------
+# Variables de entorno
+# ---------------------------------------------------------
+
 API_KEY = os.getenv("API_KEY_VALUE")
 BASE_URL = os.getenv("BASE_URL")
 
+# ---------------------------------------------------------
+# Función auxiliar: ejecutar sincronización mensual
+# ---------------------------------------------------------
 
 def run_monthly_sync():
     db = SessionLocal()
@@ -36,6 +43,9 @@ def run_monthly_sync():
 
     db.close()
 
+# ---------------------------------------------------------
+# Función auxiliar: iniciar el scheduler
+# ---------------------------------------------------------
 
 def start_scheduler():
     scheduler = BackgroundScheduler()

backend/app/schema/auth.py

@@ -1,11 +1,17 @@
 from pydantic import BaseModel, Field
 
+# ---------------------------------------------------------
+# Modelo de solicitud de login OAuth
+# ---------------------------------------------------------
 
 class OrcidLoginRequestSchema(BaseModel):
     # `code` is the authorization code returned by ORCID OAuth after the user signs in.
     # Exchanging it for tokens must happen server-side.
     code: str = Field(..., examples=["Q70Y3A"])
 
+# ---------------------------------------------------------
+# Modelo de respuesta de login OAuth
+# ---------------------------------------------------------
 
 class OrcidLoginResponseSchema(BaseModel):
     access_token: str

backend/app/schema/export.py

@@ -0,0 +1,23 @@
+"""
+Schemas de los endpoints de export.
+
+El backend recibe `pub_ids` como UUIDs en formato string. Pydantic ya los
+valida y convierte; aquí además aplicamos un tope de tamaño para impedir
+peticiones gigantes.
+"""
+
+from __future__ import annotations
+
+from typing import List
+from uuid import UUID
+
+from pydantic import BaseModel, Field
+
+from app.core.config import settings
+
+
+class PublicationIdsRequestSchema(BaseModel):
+    pub_ids: List[UUID] = Field(
+        min_length=1,
+        max_length=settings.MAX_PUB_IDS_BATCH,
+    )

backend/app/schema/publication.py

@@ -3,6 +3,10 @@ from uuid import UUID
 from typing import Optional, List, Any
 from datetime import datetime
 
+# ---------------------------------------------------------
+# Modelo de publicación
+# ---------------------------------------------------------
+
 class PublicationSchema(BaseModel):
     id: UUID
     put_code: int | None = None

backend/app/schema/researcher.py

@@ -1,13 +1,18 @@
-from pydantic import BaseModel, Field
-from uuid import UUID
-from typing import Optional, List, Dict
 from datetime import datetime
+from typing import Dict, List, Optional
+from uuid import UUID
+
+from pydantic import BaseModel, Field, field_validator
+
+from app.core.config import settings
 from app.schema.publication import PublicationSchema
+from app.utils.orcid_validator import ORCID_PATTERN, is_valid_orcid
+
 
 class ResearcherSchema(BaseModel):
     id: UUID
-    orcid_id: str
-    name: Optional[str]
+    orcid_id: str = Field(min_length=19, max_length=19, pattern=ORCID_PATTERN)
+    name: Optional[str] = Field(default=None, max_length=255)
     authenticated: bool
     last_sync_at: Optional[datetime]
 
@@ -33,7 +38,25 @@ class ResearcherWithPublicationsSchema(BaseModel):
 
 
 class ResearcherBatchSearchRequestSchema(BaseModel):
-    orcid_ids: List[str] = Field(min_length=1)
+    orcid_ids: List[str] = Field(
+        min_length=1,
+        max_length=settings.MAX_ORCID_BATCH,
+    )
+
+    @field_validator("orcid_ids")
+    @classmethod
+    def _validate_each(cls, value: List[str]) -> List[str]:
+        deduped: List[str] = []
+        seen = set()
+        for v in value:
+            if not isinstance(v, str):
+                raise ValueError("ORCID iD debe ser string")
+            if not is_valid_orcid(v):
+                raise ValueError(f"ORCID iD inválido: {v}")
+            if v not in seen:
+                seen.add(v)
+                deduped.append(v)
+        return deduped
 
 
 class ResearcherSearchErrorSchema(BaseModel):

backend/app/security/api_key.py

@@ -1,43 +1,52 @@
-import os
-from dotenv import load_dotenv
+"""
+Autenticación por API key (uso máquina-a-máquina, p. ej. el scheduler interno).
+
+Endurecimiento:
+- Comparación constante en tiempo (`hmac.compare_digest`) para evitar timing attacks.
+- No se loggea el valor de la cabecera bajo ninguna circunstancia.
+- Se separa este mecanismo del JWT de usuario; la API key NO debe usarse como
+  prueba de identidad de un investigador.
+"""
+
+from __future__ import annotations
+
+import hmac
+
 from fastapi import Depends, HTTPException, status
 from fastapi.security import APIKeyHeader
 
-# Cargar variables del .env
-load_dotenv()
-
-API_KEY_NAME = os.getenv("API_KEY_NAME")
-API_KEY_VALUE = os.getenv("API_KEY_VALUE")
-
-if not API_KEY_NAME:
-    raise RuntimeError("ERROR: La variable API_KEY_NAME no está definida en el .env")
-
-if not API_KEY_VALUE:
-    raise RuntimeError("ERROR: La variable API_KEY_VALUE no está definida en el .env")
-
-api_key_header = APIKeyHeader(name=API_KEY_NAME, auto_error=False)
+from app.core.config import settings
 
 
-def get_api_key(api_key: str = Depends(api_key_header)):
-    if api_key != API_KEY_VALUE:
+api_key_header = APIKeyHeader(name=settings.API_KEY_NAME, auto_error=False)
+
+
+def _is_valid_key(provided: str | None) -> bool:
+    if not provided or not settings.API_KEY_VALUE:
+        return False
+    return hmac.compare_digest(provided.encode("utf-8"), settings.API_KEY_VALUE.encode("utf-8"))
+
+
+def get_api_key(api_key: str | None = Depends(api_key_header)) -> str:
+    if not _is_valid_key(api_key):
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="API key inválida o ausente."
+            detail="Invalid or missing API key",
         )
-    return api_key
+    return api_key  # type: ignore[return-value]
 
 
-def get_api_key_optional(api_key: str = Depends(api_key_header)) -> str | None:
+def get_api_key_optional(api_key: str | None = Depends(api_key_header)) -> str | None:
     """
-    Devuelve la API key si está presente y es correcta.
-    - Si no está presente: None
-    - Si está presente pero incorrecta: 401
+    - Si no llega cabecera: None.
+    - Si llega y es válida: la devuelve.
+    - Si llega pero es inválida: 401.
     """
     if api_key is None:
         return None
-    if api_key != API_KEY_VALUE:
+    if not _is_valid_key(api_key):
         raise HTTPException(
             status_code=status.HTTP_401_UNAUTHORIZED,
-            detail="API key inválida."
+            detail="Invalid API key",
         )
     return api_key

backend/app/security/jwt.py

@@ -1,75 +1,138 @@
-import os
+"""
+Emisión y verificación de JWT.
+
+Endurecimiento aplicado:
+- Sin fallback de secreto débil: si la configuración no es válida, falla al arranque.
+- `iss` y `aud` obligatorios.
+- `nbf` (not-before) y `iat` validados.
+- `typ=access` para evitar mezclar tipos de token.
+- Algoritmo fijo (no se acepta "none" ni cambios por payload).
+- Errores opacos: nunca se expone el motivo del fallo de verificación al cliente.
+"""
+
+from __future__ import annotations
+
 from datetime import datetime, timedelta, timezone
 from typing import Any
+from uuid import uuid4
 
-from fastapi import Depends, HTTPException, status
+from fastapi import Depends, HTTPException, Request, status
 from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
 from jose import JWTError, jwt
 from sqlalchemy.orm import Session
-from dotenv import load_dotenv
 
+from app.core.config import settings
 from app.db.models import Researcher
 from app.db.session import get_db
-
-load_dotenv()
+from app.utils.orcid_validator import is_valid_orcid
 
 
 _bearer = HTTPBearer(auto_error=False)
 
 
-def _settings() -> tuple[str, str, int]:
-    # Fallback de desarrollo para evitar 500 por configuración ausente.
-    secret = os.getenv("JWT_SECRET") or "change_me"
-    algorithm = os.getenv("JWT_ALGORITHM") or "HS256"
-    expires_minutes = int(os.getenv("JWT_EXPIRES_MINUTES") or "720")
-    return secret, algorithm, expires_minutes
-
-
 def create_access_token(*, subject: str, extra: dict[str, Any] | None = None) -> str:
-    secret, algorithm, expires_minutes = _settings()
+    """
+    Emite un access token firmado con HS256 (configurable).
+
+    `subject` debe ser el ORCID iD verificado del investigador.
+    """
+    if not is_valid_orcid(subject):
+        raise ValueError("subject must be a valid ORCID iD")
+
     now = datetime.now(timezone.utc)
     payload: dict[str, Any] = {
+        "iss": settings.JWT_ISSUER,
+        "aud": settings.JWT_AUDIENCE,
         "sub": subject,
         "iat": int(now.timestamp()),
-        "exp": int((now + timedelta(minutes=expires_minutes)).timestamp()),
+        "nbf": int(now.timestamp()),
+        "exp": int((now + timedelta(minutes=settings.JWT_EXPIRES_MINUTES)).timestamp()),
+        "jti": uuid4().hex,
+        "typ": "access",
     }
     if extra:
+        for reserved in ("iss", "aud", "sub", "iat", "nbf", "exp", "jti", "typ"):
+            extra.pop(reserved, None)
         payload.update(extra)
-    return jwt.encode(payload, secret, algorithm=algorithm)
+
+    return jwt.encode(payload, settings.JWT_SECRET, algorithm=settings.JWT_ALGORITHM)
+
+
+def _decode_token(token: str) -> dict[str, Any]:
+    try:
+        return jwt.decode(
+            token,
+            settings.JWT_SECRET,
+            algorithms=[settings.JWT_ALGORITHM],
+            audience=settings.JWT_AUDIENCE,
+            issuer=settings.JWT_ISSUER,
+            options={
+                "require_iat": True,
+                "require_nbf": True,
+                "require_exp": True,
+                "require_aud": True,
+                "require_iss": True,
+            },
+        )
+    except JWTError as exc:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Invalid or expired token",
+            headers={"WWW-Authenticate": "Bearer"},
+        ) from exc
 
 
 def get_current_researcher(
-    creds: HTTPAuthorizationCredentials = Depends(_bearer),
+    request: Request,
+    creds: HTTPAuthorizationCredentials | None = Depends(_bearer),
     db: Session = Depends(get_db),
 ) -> Researcher:
     if not creds or not creds.credentials:
-        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Missing bearer token")
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Missing bearer token",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
 
-    secret, algorithm, _ = _settings()
-    try:
-        payload = jwt.decode(creds.credentials, secret, algorithms=[algorithm])
-    except JWTError:
-        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token")
+    payload = _decode_token(creds.credentials)
+
+    if payload.get("typ") != "access":
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Invalid token type",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
 
     orcid_id = payload.get("sub")
-    if not isinstance(orcid_id, str) or not orcid_id:
-        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token subject")
+    if not isinstance(orcid_id, str) or not is_valid_orcid(orcid_id):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Invalid token subject",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
 
     researcher = db.query(Researcher).filter(Researcher.orcid_id == orcid_id).first()
     if not researcher or not researcher.authenticated:
-        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Researcher not authenticated")
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Researcher not authenticated",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    request.state.researcher = researcher
     return researcher
 
 
 def get_optional_current_researcher(
-    creds: HTTPAuthorizationCredentials = Depends(_bearer),
+    request: Request,
+    creds: HTTPAuthorizationCredentials | None = Depends(_bearer),
     db: Session = Depends(get_db),
 ) -> Researcher | None:
     """
-    Devuelve el investigador autenticado si hay Bearer token.
-    Si no hay token, devuelve None.
-    Si hay token inválido, lanza 401.
+    Devuelve el investigador autenticado si hay Bearer válido.
+    Si no hay Bearer, devuelve None.
+    Si hay Bearer inválido, lanza 401 (no se acepta como anónimo).
     """
     if not creds or not creds.credentials:
         return None
-    return get_current_researcher(creds=creds, db=db)
+    return get_current_researcher(request=request, creds=creds, db=db)

backend/app/security/oauth_state.py

@@ -0,0 +1,76 @@
+"""
+OAuth state anti-CSRF para el flujo de login con ORCID.
+
+El parámetro `state` se genera en `/auth/orcid/authorize`, se guarda en una
+cookie HttpOnly + SameSite=Lax con TTL corto, y se valida en el callback.
+
+Si el `state` falta, no coincide o ha expirado, el login se rechaza.
+"""
+
+from __future__ import annotations
+
+import hmac
+import secrets
+from datetime import datetime, timezone
+
+from fastapi import HTTPException, status
+from starlette.requests import Request
+from starlette.responses import Response
+
+from app.core.config import settings
+
+
+_STATE_BYTES = 32
+
+
+def generate_state() -> str:
+    return secrets.token_urlsafe(_STATE_BYTES)
+
+
+def attach_state_cookie(response: Response, state: str) -> None:
+    """
+    Persiste el `state` en una cookie segura y devuelve el valor crudo.
+    """
+    response.set_cookie(
+        key=settings.ORCID_OAUTH_STATE_COOKIE,
+        value=state,
+        max_age=settings.ORCID_OAUTH_STATE_TTL_SECONDS,
+        secure=settings.is_production,
+        httponly=True,
+        samesite="lax",
+        path="/",
+    )
+
+
+def clear_state_cookie(response: Response) -> None:
+    response.delete_cookie(
+        key=settings.ORCID_OAUTH_STATE_COOKIE,
+        path="/",
+    )
+
+
+def validate_state(request: Request, received_state: str | None) -> None:
+    """
+    Compara el state recibido en el callback con el almacenado en cookie.
+
+    Lanza 400 si no coincide o falta. Comparación en tiempo constante.
+    """
+    if not settings.ORCID_OAUTH_STATE_ENABLED:
+        return
+
+    cookie_value = request.cookies.get(settings.ORCID_OAUTH_STATE_COOKIE)
+    if not cookie_value or not received_state:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="OAuth state missing",
+        )
+
+    if not hmac.compare_digest(cookie_value.encode("utf-8"), received_state.encode("utf-8")):
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="OAuth state mismatch",
+        )
+
+
+def now_ts() -> int:
+    return int(datetime.now(timezone.utc).timestamp())

backend/app/services/normalizer.py

@@ -1,5 +1,8 @@
 from typing import List
 
+# ---------------------------------------------------------
+# Función auxiliar: obtener valor de un diccionario
+# ---------------------------------------------------------
 
 def _get(d: dict | None, *keys, default=None):
     cur = d or {}
@@ -11,6 +14,9 @@ def _get(d: dict | None, *keys, default=None):
             return default
     return cur
 
+# ---------------------------------------------------------
+# Clase de normalización de publicaciones
+# ---------------------------------------------------------
 
 class PublicationNormalizer:
     @staticmethod

backend/app/services/orcid_client.py

@@ -14,8 +14,14 @@ BASE_URL_SANDBOX = "https://pub.sandbox.orcid.org/v3.0"
 # TOKEN_URL_PROD = "https://orcid.org/oauth/token"
 # BASE_URL_PROD = "https://pub.orcid.org/v3.0"
 
+# ---------------------------------------------------------
+# Clase de cliente de ORCID
+# ---------------------------------------------------------
 
 class ORCIDClient:
+    # ---------------------------------------------------------
+    # Función auxiliar: inicializar el cliente de ORCID
+    # ---------------------------------------------------------
     def __init__(self):
         # Asegura que al ejecutar `uvicorn` local también se carga `backend/.env`.
         # (En docker `ORCID_REDIRECT_URI` y secretos llegan por env_file, así que esto no molesta.)
@@ -115,6 +121,10 @@ class ORCIDClient:
             params["state"] = state
         return f"{self.authorization_url}?{urllib.parse.urlencode(params)}"
 
+    # ---------------------------------------------------------
+    # Función auxiliar: intercambiar código de autorización
+    # ---------------------------------------------------------
+
     def exchange_authorization_code(
         self,
         *,

backend/app/services/sword_generator.py

@@ -6,6 +6,9 @@ ATOM_NS = "http://www.w3.org/2005/Atom"
 DC_NS = "http://purl.org/dc/elements/1.1/"
 EXTRA_NS = "http://example.org/orcid-extra"   # namespace para campos extendidos
 
+# ---------------------------------------------------------
+# Clase de generador de feed SWORD
+# ---------------------------------------------------------
 
 class SWORDGenerator:
 

backend/app/services/sync_service.py

@@ -8,12 +8,23 @@ from app.db.repositories.researcher_repository import ResearcherRepository
 from app.db.repositories.publication_repository import PublicationRepository
 from app.db.repositories.syncjob_repository import SyncJobRepository
 
+# ---------------------------------------------------------
+# Clase de servicio de sincronización
+# ---------------------------------------------------------
 
 class SyncService:
 
+    # ---------------------------------------------------------
+    # Función auxiliar: inicializar el servicio de sincronización
+    # ---------------------------------------------------------
+
     def __init__(self):
         self.orcid_client = ORCIDClient()
 
+    # ---------------------------------------------------------
+    # Función auxiliar: sincronizar las publicaciones de un investigador
+    # ---------------------------------------------------------
+
     def sync_researcher(self, db: Session, orcid_id: str):
         """
         Sincroniza las publicaciones de un investigador con manejo robusto de errores.
@@ -109,6 +120,10 @@ class SyncService:
             "total": new_records + updated_records
         }
 
+    # ---------------------------------------------------------
+    # Función auxiliar: sincronizar y obtener investigador + publicaciones
+    # ---------------------------------------------------------
+
     def sync_and_get_full(self, db: Session, orcid_id: str):
         """
         Sincroniza (si es necesario) y devuelve investigador + publicaciones.

backend/app/services/zip_generator.py

@@ -7,12 +7,16 @@ from xml.etree.ElementTree import Element, SubElement, tostring
 from app.db.models import Publication, Researcher
 from app.services.sword_generator import SWORDGenerator
 
+# ---------------------------------------------------------
+# Clase de generador de ZIP
+# ---------------------------------------------------------
 
 class ZIPGenerator:
 
     # ---------------------------------------------------------
-    # MANIFEST.TXT — más completo
+    # Función auxiliar: generar manifest.txt
     # ---------------------------------------------------------
+
     @staticmethod
     def generate_manifest(researcher, publications):
         lines = [

backend/app/utils/orcid_validator.py

@@ -2,27 +2,38 @@ import re
 
 ORCID_REGEX = re.compile(r"^\d{4}-\d{4}-\d{4}-\d{3}[0-9X]$")
 
+ORCID_PATTERN = r"^\d{4}-\d{4}-\d{4}-\d{3}[0-9X]$"
 
-def is_valid_orcid(orcid_id: str) -> bool:
+
+def is_valid_orcid(orcid_id: str | None) -> bool:
     """
     Valida un ORCID ID:
     - Formato: 0000-0000-0000-0000
     - Dígito de control según ISO 7064 Mod 11-2
     """
+    if not isinstance(orcid_id, str):
+        return False
     if not ORCID_REGEX.match(orcid_id):
         return False
 
-    # Quitar guiones
     digits = orcid_id.replace("-", "")
 
     total = 0
-    # Los primeros 15 dígitos
     for char in digits[:-1]:
         total = (total + int(char)) * 2
 
-    # Resto
     remainder = total % 11
     result = (12 - remainder) % 11
     check_digit = "X" if result == 10 else str(result)
 
     return digits[-1] == check_digit
+
+
+def assert_valid_orcid(orcid_id: str) -> str:
+    """
+    Devuelve el ORCID si es válido. Lanza ValueError si no.
+    Útil para usar como Pydantic validator.
+    """
+    if not is_valid_orcid(orcid_id):
+        raise ValueError("ORCID iD inválido")
+    return orcid_id

backend/requirements.txt

@@ -1,14 +1,16 @@
 fastapi
-uvicorn
+uvicorn[standard]
 sqlalchemy
 psycopg2-binary
 httpx
 pydantic
+pydantic-settings
 python-dotenv
 lxml
-apscheduler
+defusedxml
+APScheduler==3.10.4
 authlib
 redis
-APScheduler==3.10.4
 requests
 python-jose[cryptography]
+slowapi

docker-compose.yml

@@ -3,9 +3,9 @@ services:
   backend:
     build: ./backend
     container_name: orcid-backend
-    restart: always
+    restart: unless-stopped
     ports:
-      - "8000:8000"
+      - "127.0.0.1:8072:8000"
     env_file:
       - ./backend/.env
     environment:
@@ -17,28 +17,43 @@ services:
         condition: service_healthy
       redis:
         condition: service_started
+    read_only: true
+    tmpfs:
+      - /tmp
+    cap_drop:
+      - ALL
+    security_opt:
+      - no-new-privileges:true
+    healthcheck:
+      test: ["CMD", "curl", "-fsS", "http://127.0.0.1:8000/health"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 15s
 
   frontend:
     build: ./frontend
     container_name: orcid-frontend
-    restart: always
+    restart: unless-stopped
     ports:
-      - "5173:5173"
+      - "127.0.0.1:8073:5173"
     depends_on:
       - backend
     env_file:
       - ./frontend/.env
+    security_opt:
+      - no-new-privileges:true
 
   db:
     image: postgres:16
     container_name: orcid-postgres
-    restart: always
+    restart: unless-stopped
     environment:
       POSTGRES_USER: postgres
       POSTGRES_PASSWORD: postgres
       POSTGRES_DB: orcid_db
-    ports:
-      - "5432:5432"
+    expose:
+      - "5432"
     volumes:
       - postgres_data:/var/lib/postgresql/data
     healthcheck:
@@ -46,13 +61,18 @@ services:
       interval: 2s
       timeout: 3s
       retries: 20
+    security_opt:
+      - no-new-privileges:true
 
   redis:
     image: redis:7
     container_name: orcid-redis
-    restart: always
-    ports:
-      - "6379:6379"
+    restart: unless-stopped
+    command: ["redis-server", "--save", "60", "1", "--loglevel", "warning"]
+    expose:
+      - "6379"
+    security_opt:
+      - no-new-privileges:true
 
 volumes:
   postgres_data:

frontend/src/App.jsx

@@ -24,11 +24,21 @@ export default function App() {
       </Routes>
 
       <Toaster
-        position="top-right"
+        position="bottom-right"
         richColors
         closeButton
         theme="light"
         toastOptions={{ duration: 4000 }}
+        style={{
+          /* SUCCESS — ORCID corporate green */
+          '--success-bg': '#EAF3DE',
+          '--success-border': '#C0DD97',
+          '--success-text': '#3B6D11',
+          /* ERROR — hue-0° mirror of the ORCID green (same saturation & lightness) */
+          '--error-bg': '#F3DDDD',
+          '--error-border': '#DD9797',
+          '--error-text': '#6E1111',
+        }}
       />
     </AuthProvider>
   );

frontend/src/components/layout/AppHeader.jsx

@@ -30,7 +30,7 @@ export function AppHeader({ variant = "landing" }) {
         {/* Brand — always navigates home */}
         <Link
           to="/"
-          className="text-[15px] font-bold tracking-tight text-white transition-opacity hover:opacity-90"
+          className="text-[16px] font-bold tracking-tight text-white transition-opacity hover:opacity-90"
         >
           ORCID<span className="text-orcid-green">2</span>SWORD
         </Link>

frontend/src/components/layout/Footer.jsx

@@ -0,0 +1,86 @@
+export default function Footer() {
+    const technologies = ["ORCID OAuth 2.0", "SWORD v2", "DSpace", "EPrints", "Dublin Core"];
+  
+    return (
+      <footer className="mt-auto w-full shrink-0 border-t border-surface-border bg-surface-primary py-6">
+        <div className="mx-auto max-w-7xl px-4 sm:px-6 lg:px-8">
+  
+          {/* Main row */}
+          <div className="flex flex-col gap-8 lg:flex-row lg:items-start lg:justify-between">
+  
+            {/* Brand */}
+            <div className="flex flex-col gap-2 lg:max-w-xs">
+              <div className="flex flex-wrap items-center gap-2">
+                <span className="text-base font-extrabold tracking-tight text-ink-primary">
+                  ORCID<span className="text-orcid-green">2</span>SWORD
+                </span>
+                <span className="rounded border border-orcid-green-border bg-orcid-green-soft px-1.5 py-0.5 text-[10px] font-black uppercase tracking-widest text-orcid-green-text">
+                    Software Universitario
+                </span>
+              </div>
+              <p className="text-sm leading-relaxed text-ink-secondary">
+                Sincronización de publicaciones ORCID al repositorio institucional.
+              </p>
+            </div>
+  
+            {/* Compatible con */}
+            <div className="flex flex-col gap-2">
+              <span className="text-[10px] font-black uppercase tracking-[0.2em] text-ink-tertiary">
+                Compatible con
+              </span>
+              <div className="flex flex-wrap gap-1.5">
+                {technologies.map((tech) => (
+                  <span
+                    key={tech}
+                    className="rounded border border-surface-border bg-surface-secondary px-2 py-0.5 text-[11px] font-medium text-ink-tertiary"
+                  >
+                    {tech}
+                  </span>
+                ))}
+              </div>
+            </div>
+  
+            {/* Institutional links */}
+            <div className="flex flex-row gap-6 sm:gap-8">
+  
+              {/* Universidad de Jaén */}
+              <a
+                href="https://www.ujaen.es/"
+                target="_blank" rel="noopener noreferrer"
+                className="group flex items-center gap-2.5"
+                title="Ir a la web oficial de la Universidad de Jaén"
+              >
+                <div className="flex h-8 flex-col justify-center border-r-2 border-surface-border-strong pr-2.5 text-right transition-colors group-hover:border-brand-accent">
+                  <span className="mb-0.5 text-[11px] font-bold uppercase leading-none tracking-wide text-ink-primary">Universidad</span>
+                  <span className="text-[10px] font-medium uppercase leading-none tracking-[0.22em] text-ink-tertiary">de Jaén</span>
+                </div>
+                <img
+                  src="/uja-logo.png"
+                  alt="Logo UJA"
+                  className="h-7 w-7 object-contain grayscale opacity-80 transition-all group-hover:grayscale-0 group-hover:opacity-100"
+                />
+              </a>
+  
+              {/* Repositorio Oficial */}
+              <a
+                href="https://github.com/uja-dev-practices/orcid_system"
+                target="_blank" rel="noopener noreferrer"
+                className="group flex items-center gap-2.5"
+                title="Ver repositorio oficial"
+              >
+                <div className="flex h-8 flex-col justify-center border-r-2 border-surface-border-strong pr-2.5 text-right transition-colors group-hover:border-brand-primary">
+                  <span className="mb-0.5 text-[11px] font-bold uppercase leading-none tracking-wide text-ink-primary">Repositorio</span>
+                  <span className="text-[10px] font-medium uppercase leading-none tracking-[0.22em] text-ink-tertiary">Oficial</span>
+                </div>
+                <svg className="h-7 w-7 text-ink-tertiary transition-colors group-hover:text-brand-primary" fill="currentColor" viewBox="0 0 24 24" aria-hidden="true">
+                  <path fillRule="evenodd" d="M12 2C6.477 2 2 6.484 2 12.017c0 4.425 2.865 8.18 6.839 9.504.5.092.682-.217.682-.483 0-.237-.008-.868-.013-1.703-2.782.605-3.369-1.343-3.369-1.343-.454-1.158-1.11-1.466-1.11-1.466-.908-.62.069-.608.069-.608 1.003.07 1.531 1.032 1.531 1.032.892 1.53 2.341 1.088 2.91.832.092-.647.35-1.088.636-1.338-2.22-.253-4.555-1.113-4.555-4.951 0-1.093.39-1.988 1.029-2.688-.103-.253-.446-1.272.098-2.65 0 0 .84-.27 2.75 1.026A9.564 9.564 0 0112 6.844c.85.004 1.705.115 2.504.337 1.909-1.296 2.747-1.027 2.747-1.027.546 1.379.202 2.398.1 2.651.64.7 1.028 1.595 1.028 2.688 0 3.848-2.339 4.695-4.566 4.943.359.309.678.92.678 1.855 0 1.338-.012 2.419-.012 2.747 0 .268.18.58.688.482A10.019 10.019 0 0022 12.017C22 6.484 17.522 2 12 2z" clipRule="evenodd" />
+                </svg>
+              </a>
+  
+            </div>
+          </div>
+  
+        </div>
+      </footer>
+    );
+  }

frontend/src/contexts/AuthContext.jsx

@@ -78,6 +78,20 @@ export function AuthProvider({ children }) {
     return () => window.removeEventListener("message", handleMessage);
   }, []);
 
+  // Fallback when postMessage cannot reach the opener (e.g. browser policy
+  // severs window.opener during the OAuth redirect chain). localStorage is
+  // shared between same-origin windows, so the popup's `setItem(...)` fires
+  // a storage event in this window and we can pick up the new token.
+  useEffect(() => {
+    function handleStorage(event) {
+      if (event.key !== STORAGE_KEY) return;
+      if (event.newValue) setToken(event.newValue);
+      else setToken(null);
+    }
+    window.addEventListener("storage", handleStorage);
+    return () => window.removeEventListener("storage", handleStorage);
+  }, []);
+
   /**
    * Stores a JWT directly (used by AuthCallbackPage).
    * Does NOT trigger any network request.

frontend/src/index.css

@@ -55,6 +55,12 @@
   --color-tag-default-text: #5F5E5A;
   --color-tag-default-border: #D3D1C7;
 
+  /* Error (hue-0° mirrors of the ORCID green palette — same HSL lightness & saturation) */
+  --color-error-vivid: #CE3939;
+  --color-error-soft: #F3DDDD;
+  --color-error-border: #DD9797;
+  --color-error-text: #6E1111;
+
   /* Fonts */
   --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
   --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

frontend/src/pages/AuthCallbackPage.jsx

@@ -36,6 +36,7 @@ export function AuthCallbackPage() {
     hasHandledCodeRef.current = true;
 
     const code = searchParams.get("code");
+    const state = searchParams.get("state");
     const oauthError = searchParams.get("error");
     const errorDescription = searchParams.get("error_description");
 
@@ -69,7 +70,7 @@ export function AuthCallbackPage() {
     }
     sessionStorage.setItem(consumedKey, "1");
 
-    exchangeOrcidCode(code)
+    exchangeOrcidCode(code, { state })
       .then(({ access_token }) => {
         storeToken(access_token);
         setStatus("success");
@@ -87,16 +88,29 @@ export function AuthCallbackPage() {
   // eslint-disable-next-line react-hooks/exhaustive-deps
   }, []);
 
-  // After a short delay, redirect to home if we're NOT in a popup
-  // (fallback for browsers that block window.open).
+  // After a short delay, always attempt window.close():
+  //  - If we're in the OAuth popup (opened by window.open()), the browser
+  //    allows close() and the window disappears.
+  //  - If the window doesn't close (browser blocked it, or the user opened
+  //    /callback directly as a plain tab), we detect that via window.closed
+  //    and fall back to navigating to "/" so the user sees the landing page.
+  //
+  // NOTE: Neither window.opener nor window.name are reliable here.
+  //   - window.name is cleared by Chrome on cross-origin navigation
+  //     (our domain → sandbox.orcid.org → our domain clears the name).
+  //   - window.opener is severed by ORCID Sandbox's own COOP header
+  //     while the popup passes through their domain.
   useEffect(() => {
-    if (status === "success" || status === "error") {
-      const isPopup = Boolean(window.opener);
-      if (!isPopup) {
-        const timer = setTimeout(() => navigate("/"), 2000);
-        return () => clearTimeout(timer);
-      }
-    }
+    if (status !== "success" && status !== "error") return;
+    const outer = setTimeout(() => {
+      window.close();
+      // Give the browser a tick to process the close. If the window
+      // is still open, we're in a plain tab — navigate to home instead.
+      setTimeout(() => {
+        if (!window.closed) navigate("/");
+      }, 300);
+    }, 1500);
+    return () => clearTimeout(outer);
   }, [status, navigate]);
 
   return (
@@ -154,9 +168,16 @@ export function AuthCallbackPage() {
 /* ─────────────────────────── Helpers ───────────────────────────── */
 
 /**
- * If running in a popup, posts a message to the opener and closes the
- * window. If not in a popup (e.g. browser blocked it), the message is
- * irrelevant — the useEffect above handles the redirect to "/".
+ * If running in a popup, posts a message to the opener so the parent
+ * window can update its auth state without waiting for the storage event
+ * fallback in AuthContext. The actual `window.close()` is handled by the
+ * delayed effect above so we don't race with the success/error UI.
+ *
+ * `window.opener` may be `null` here when the browser severed the opener
+ * relationship during the OAuth redirect chain (some COOP combinations
+ * trigger this). In that case AuthContext picks up the new token via the
+ * `storage` event instead — that's why we still call `storeToken()` even
+ * when we can't postMessage.
  */
 function notifyAndClose(message) {
   if (window.opener && !window.opener.closed) {
@@ -165,8 +186,6 @@ function notifyAndClose(message) {
     } catch {
       /* opener may have navigated away */
     }
-    // Small delay so the user sees the success/error state before close.
-    setTimeout(() => window.close(), 1200);
   }
 }
 

frontend/src/pages/DashboardPage.jsx

@@ -3,6 +3,7 @@ import { useLocation, useParams, Navigate } from "react-router-dom";
 import { toast } from "sonner";
 
 import { AppHeader } from "../components/layout/AppHeader";
+import Footer from "../components/layout/Footer";
 import { ResearcherCard } from "../components/dashboard/ResearcherCard";
 import { StatsRow } from "../components/dashboard/StatsRow";
 import { PublicationsTable } from "../components/dashboard/PublicationsTable";
@@ -196,53 +197,42 @@ export function DashboardPage() {
   return (
     <div className="flex min-h-screen flex-col bg-surface-tertiary">
       <AppHeader variant="dashboard" />
+      <main className="flex-1">
+        <div className="mx-auto w-full max-w-[1100px] px-5 py-7">
+          {researcher ? (
+            <ResearcherCard
+              researcher={researcher}
+              actions={
+                <>
+                  <SyncButton onClick={handleSync} status={syncStatus} />
+                  <ExportDropdown
+                    onExport={handleExport}
+                    exportingFormat={exportingFormat}
+                    selectedCount={selectedIds.size}
+                    isAuthenticated={isAuthenticated}
+                    newPublicationsCount={newPublicationIds.length}
+                  />
+                </>
+              }
+            />
+          ) : (
+            <ResearcherSkeleton />
+          )}
 
-      <div className="mx-auto w-full max-w-[1100px] px-5 py-7">
-        {researcher ? (
-          <ResearcherCard
-            researcher={researcher}
-            actions={
-              <>
-                <SyncButton onClick={handleSync} status={syncStatus} />
-                <ExportDropdown
-                  onExport={handleExport}
-                  exportingFormat={exportingFormat}
-                  selectedCount={selectedIds.size}
-                  isAuthenticated={isAuthenticated}
-                  newPublicationsCount={newPublicationIds.length}
-                />
-              </>
-            }
+          <StatsRow publications={publications} />
+
+          <PublicationsTable
+            publications={publications}
+            loading={pubsLoading}
+            error={pubsError}
+            onRetry={() => loadBundle()}
+            selectedIds={selectedIds}
+            onSelectedIdsChange={setSelectedIds}
+            isAuthenticated={isAuthenticated}
           />
-        ) : (
-          <ResearcherSkeleton />
-        )}
-
-        <StatsRow publications={publications} />
-
-        <PublicationsTable
-          publications={publications}
-          loading={pubsLoading}
-          error={pubsError}
-          onRetry={() => loadBundle()}
-          selectedIds={selectedIds}
-          onSelectedIdsChange={setSelectedIds}
-          isAuthenticated={isAuthenticated}
-        />
-
-        <footer className="mt-4 flex flex-wrap items-center justify-between gap-2 px-1">
-          <span className="text-xs text-ink-tertiary">
-            Datos obtenidos vía ORCID Public API v3.0
-          </span>
-          <div className="flex gap-4">
-            {["ORCID OAuth 2.0", "SWORD v2", "Dublin Core"].map((t) => (
-              <span key={t} className="text-xs text-ink-tertiary">
-                {t}
-              </span>
-            ))}
-          </div>
-        </footer>
-      </div>
+        </div>
+      </main>
+      <Footer />
     </div>
   );
 }

frontend/src/pages/GroupResultsPage.jsx

@@ -3,6 +3,7 @@ import { useLocation, useNavigate, Link } from "react-router-dom";
 import { toast } from "sonner";
 
 import { AppHeader } from "../components/layout/AppHeader";
+import Footer from "../components/layout/Footer";
 import { Spinner } from "../components/ui/Spinner";
 import { OrcidLogo } from "../components/ui/OrcidLogo";
 import {
@@ -188,135 +189,137 @@ export function GroupResultsPage() {
   return (
     <div className="flex min-h-screen flex-col bg-surface-tertiary">
       <AppHeader variant="group" />
+      <main className="flex-1">
+        <div className="mx-auto w-full max-w-[1100px] px-5 py-7">
+          {/* Page header */}
+          <div className="mb-6 flex flex-wrap items-center justify-between gap-4">
+            <div className="flex items-center gap-3">
+              <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-xl bg-brand-primary text-white">
+                <UsersIcon size={20} />
+              </div>
+              <div>
+                <h1 className="text-xl font-semibold text-ink-primary">
+                  Búsqueda grupal
+                </h1>
+                {!loading && (
+                  <p className="text-xs text-ink-tertiary">
+                    {results.length} investigador{results.length !== 1 ? "es" : ""} encontrado{results.length !== 1 ? "s" : ""}
+                    {errors.length > 0 && (
+                      <span className="ml-1 text-ink-danger">
+                        · {errors.length} con error
+                      </span>
+                    )}
+                  </p>
+                )}
+              </div>
+            </div>
 
-      <div className="mx-auto w-full max-w-[1100px] px-5 py-7">
-        {/* Page header */}
-        <div className="mb-6 flex flex-wrap items-center justify-between gap-4">
-          <div className="flex items-center gap-3">
-            <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-xl bg-brand-primary text-white">
-              <UsersIcon size={20} />
-            </div>
-            <div>
-              <h1 className="text-xl font-semibold text-ink-primary">
-                Búsqueda grupal
-              </h1>
-              {!loading && (
-                <p className="text-xs text-ink-tertiary">
-                  {results.length} investigador{results.length !== 1 ? "es" : ""} encontrado{results.length !== 1 ? "s" : ""}
-                  {errors.length > 0 && (
-                    <span className="ml-1 text-ink-danger">
-                      · {errors.length} con error
-                    </span>
-                  )}
-                </p>
-              )}
-            </div>
+            {/* Global export buttons */}
+            {!loading && results.length > 0 && (
+              <div className="flex gap-2">
+                {["xml", "zip"].map((fmt) => (
+                  <button
+                    key={fmt}
+                    type="button"
+                    onClick={() => handleGlobalExport(fmt)}
+                    disabled={globalDisabled}
+                    className="inline-flex items-center gap-2 rounded-lg border border-surface-border-strong bg-surface-primary px-4 py-2 text-sm font-medium text-ink-primary transition-colors enabled:hover:bg-surface-secondary disabled:cursor-not-allowed disabled:opacity-60"
+                  >
+                    {globalExporting === fmt ? (
+                      <Spinner size={14} />
+                    ) : isAuthenticated && allNewIds.length > 0 ? (
+                      <SparkleIcon size={13} className="text-brand-accent" />
+                    ) : (
+                      <DownloadIcon size={14} />
+                    )}
+                    {globalExporting === fmt
+                      ? `Exportando ${fmt.toUpperCase()}...`
+                      : `${fmt.toUpperCase()} · ${globalLabel}`}
+                  </button>
+                ))}
+              </div>
+            )}
           </div>
 
-          {/* Global export buttons */}
+          {/* Loading state */}
+          {loading && (
+            <div className="flex flex-col items-center justify-center gap-4 py-24 text-ink-tertiary">
+              <Spinner size={28} />
+              <p className="text-sm">
+                Sincronizando {orcidIds?.length ?? "?"} investigadores con ORCID...
+              </p>
+              <p className="text-xs text-ink-tertiary/60">
+                Esto puede tardar unos segundos si hay muchos perfiles nuevos.
+              </p>
+            </div>
+          )}
+
+          {/* Results grid */}
           {!loading && results.length > 0 && (
-            <div className="flex gap-2">
-              {["xml", "zip"].map((fmt) => (
-                <button
-                  key={fmt}
-                  type="button"
-                  onClick={() => handleGlobalExport(fmt)}
-                  disabled={globalDisabled}
-                  className="inline-flex items-center gap-2 rounded-lg border border-surface-border-strong bg-surface-primary px-4 py-2 text-sm font-medium text-ink-primary transition-colors enabled:hover:bg-surface-secondary disabled:cursor-not-allowed disabled:opacity-60"
-                >
-                  {globalExporting === fmt ? (
-                    <Spinner size={14} />
-                  ) : isAuthenticated && allNewIds.length > 0 ? (
-                    <SparkleIcon size={13} className="text-brand-accent" />
-                  ) : (
-                    <DownloadIcon size={14} />
-                  )}
-                  {globalExporting === fmt
-                    ? `Exportando ${fmt.toUpperCase()}...`
-                    : `${fmt.toUpperCase()} · ${globalLabel}`}
-                </button>
+            <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
+              {results.map((bundle) => (
+                <ResearcherResultCard
+                  key={bundle.researcher?.orcid_id}
+                  bundle={bundle}
+                  isAuthenticated={isAuthenticated}
+                  exporting={cardExporting[bundle.researcher?.orcid_id] ?? null}
+                  onExport={(fmt, newIds, totalIds) =>
+                    handleCardExport(
+                      bundle.researcher?.orcid_id,
+                      fmt,
+                      newIds,
+                      totalIds,
+                    )
+                  }
+                />
               ))}
             </div>
           )}
-        </div>
 
-        {/* Loading state */}
-        {loading && (
-          <div className="flex flex-col items-center justify-center gap-4 py-24 text-ink-tertiary">
-            <Spinner size={28} />
-            <p className="text-sm">
-              Sincronizando {orcidIds?.length ?? "?"} investigadores con ORCID...
-            </p>
-            <p className="text-xs text-ink-tertiary/60">
-              Esto puede tardar unos segundos si hay muchos perfiles nuevos.
-            </p>
-          </div>
-        )}
-
-        {/* Results grid */}
-        {!loading && results.length > 0 && (
-          <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-3">
-            {results.map((bundle) => (
-              <ResearcherResultCard
-                key={bundle.researcher?.orcid_id}
-                bundle={bundle}
-                isAuthenticated={isAuthenticated}
-                exporting={cardExporting[bundle.researcher?.orcid_id] ?? null}
-                onExport={(fmt, newIds, totalIds) =>
-                  handleCardExport(
-                    bundle.researcher?.orcid_id,
-                    fmt,
-                    newIds,
-                    totalIds,
-                  )
-                }
-              />
-            ))}
-          </div>
-        )}
-
-        {/* Errors */}
-        {!loading && errors.length > 0 && (
-          <div className="mt-6">
-            <h2 className="mb-3 text-sm font-medium text-ink-secondary">
-              ORCID iDs que no pudieron cargarse
-            </h2>
-            <div className="space-y-2">
-              {errors.map((e) => (
-                <div
-                  key={e.orcid_id}
-                  className="flex items-start gap-3 rounded-xl border border-red-200 bg-red-50 px-4 py-3"
-                >
-                  <AlertIcon size={16} className="mt-0.5 shrink-0 text-red-500" />
-                  <div>
-                    <p className="font-mono text-[13px] font-medium text-red-700">
-                      {e.orcid_id}
-                    </p>
-                    <p className="text-xs text-red-500">
-                      {e.detail ?? "No se pudo obtener información de este ORCID."}
-                    </p>
+          {/* Errors */}
+          {!loading && errors.length > 0 && (
+            <div className="mt-6">
+              <h2 className="mb-3 text-sm font-medium text-ink-secondary">
+                ORCID iDs que no pudieron cargarse
+              </h2>
+              <div className="space-y-2">
+                {errors.map((e) => (
+                  <div
+                    key={e.orcid_id}
+                    className="flex items-start gap-3 rounded-xl border border-red-200 bg-red-50 px-4 py-3"
+                  >
+                    <AlertIcon size={16} className="mt-0.5 shrink-0 text-red-500" />
+                    <div>
+                      <p className="font-mono text-[13px] font-medium text-red-700">
+                        {e.orcid_id}
+                      </p>
+                      <p className="text-xs text-red-500">
+                        {e.detail ?? "No se pudo obtener información de este ORCID."}
+                      </p>
+                    </div>
                   </div>
-                </div>
-              ))}
+                ))}
+              </div>
             </div>
-          </div>
-        )}
+          )}
 
-        {/* Empty state */}
-        {!loading && results.length === 0 && errors.length === 0 && (
-          <div className="flex flex-col items-center justify-center gap-3 py-24 text-center text-ink-tertiary">
-            <UsersIcon size={32} className="opacity-30" />
-            <p className="text-sm">No se encontraron resultados.</p>
-            <Link
-              to="/"
-              className="mt-1 inline-flex items-center gap-1.5 rounded-md bg-brand-primary px-3 py-1.5 text-xs font-medium text-white hover:bg-brand-primary-hover"
-            >
-              <ArrowLeftIcon />
-              Volver al inicio
-            </Link>
-          </div>
-        )}
-      </div>
+          {/* Empty state */}
+          {!loading && results.length === 0 && errors.length === 0 && (
+            <div className="flex flex-col items-center justify-center gap-3 py-24 text-center text-ink-tertiary">
+              <UsersIcon size={32} className="opacity-30" />
+              <p className="text-sm">No se encontraron resultados.</p>
+              <Link
+                to="/"
+                className="mt-1 inline-flex items-center gap-1.5 rounded-md bg-brand-primary px-3 py-1.5 text-xs font-medium text-white hover:bg-brand-primary-hover"
+              >
+                <ArrowLeftIcon />
+                Volver al inicio
+              </Link>
+            </div>
+          )}
+        </div>
+      </main>
+      <Footer />
     </div>
   );
 }

frontend/src/pages/LandingPage.jsx

@@ -1,15 +1,17 @@
 import { useEffect, useRef, useState } from "react";
-import { useNavigate } from "react-router-dom";
+import { Link, useNavigate } from "react-router-dom";
 import { toast } from "sonner";
 
 import { AppHeader } from "../components/layout/AppHeader";
-import { DocumentIcon, UsersIcon } from "../components/ui/Icons";
+import { UsersIcon } from "../components/ui/Icons";
 import { OrcidLogo } from "../components/ui/OrcidLogo";
 import { Spinner } from "../components/ui/Spinner";
+import { getInitials } from "../utils/formatters";
 import { formatOrcidInput, isValidOrcid } from "../utils/orcid";
 import { getOrcidAuthorizeUrl, searchResearcher } from "../services/api";
 import { useAuth } from "../contexts/AuthContext";
 import { AUTH_MESSAGE_TYPE, AUTH_ERROR_TYPE } from "../contexts/AuthContext";
+import Footer from "../components/layout/Footer";
 
 /**
  * Entry view: login con ORCID iD + búsqueda individual anónima +
@@ -21,7 +23,22 @@ import { AUTH_MESSAGE_TYPE, AUTH_ERROR_TYPE } from "../contexts/AuthContext";
  */
 export function LandingPage() {
   const navigate = useNavigate();
-  const { isAuthenticated } = useAuth();
+  const { isAuthenticated, userName, userOrcidId } = useAuth();
+
+  // If the JWT doesn't carry the name (ORCID sandbox omits it), fetch it
+  // lazily from the public researcher endpoint so the identity block is correct.
+  const [resolvedName, setResolvedName] = useState(null);
+  useEffect(() => {
+    if (!isAuthenticated || !userOrcidId) { setResolvedName(null); return; }
+    if (userName) { setResolvedName(userName); return; }
+    let cancelled = false;
+    searchResearcher(userOrcidId)
+      .then((bundle) => { if (!cancelled) setResolvedName(bundle.researcher?.name ?? null); })
+      .catch(() => {});
+    return () => { cancelled = true; };
+  }, [isAuthenticated, userOrcidId, userName]);
+
+  const displayName = resolvedName ?? userName;
 
   const [orcidInput, setOrcidInput] = useState("");
   const [error, setError] = useState("");
@@ -29,9 +46,11 @@ export function LandingPage() {
   const [loginLoading, setLoginLoading] = useState(false);
 
   // Group search state
-  const [groupInput, setGroupInput] = useState("");
+  const [groupTags, setGroupTags] = useState([]);
+  const [groupRawInput, setGroupRawInput] = useState("");
   const [groupError, setGroupError] = useState("");
   const [groupLoading, setGroupLoading] = useState(false);
+  const groupInputRef = useRef(null);
 
   // Cleanup refs for popup polling interval
   const popupRef = useRef(null);
@@ -126,28 +145,60 @@ export function LandingPage() {
     }
   }
 
-  function parseGroupOrcids(raw) {
-    return raw
-      .split(/[\s,\n]+/)
-      .map((s) => s.trim())
-      .filter(Boolean);
+  /**
+   * Splits a raw string on comma/space/newline separators, promotes valid
+   * ORCIDs to tags (deduplicating against existing ones), and returns any
+   * leftover invalid tokens joined by a space so the user can correct them.
+   */
+  function commitRawInput(raw) {
+    const parts = raw.split(/[\s,\n]+/).map((s) => s.trim()).filter(Boolean);
+    const valid = parts.filter(isValidOrcid);
+    const invalid = parts.filter((p) => !isValidOrcid(p));
+    if (valid.length > 0) {
+      setGroupTags((prev) => [...new Set([...prev, ...valid])]);
+      if (groupError) setGroupError("");
+    }
+    return invalid.join(" ");
+  }
+
+  function handleGroupTagKeyDown(event) {
+    const { key } = event;
+    if (key === "Enter" || key === "," || key === " ") {
+      event.preventDefault();
+      const leftover = commitRawInput(groupRawInput);
+      setGroupRawInput(leftover);
+    } else if (key === "Backspace" && groupRawInput === "" && groupTags.length > 0) {
+      setGroupTags((prev) => prev.slice(0, -1));
+    }
+  }
+
+  function handleGroupRawChange(event) {
+    setGroupRawInput(event.target.value);
+    if (groupError) setGroupError("");
+  }
+
+  function handleGroupPaste(event) {
+    event.preventDefault();
+    const pasted = event.clipboardData.getData("text");
+    const combined = groupRawInput ? `${groupRawInput} ${pasted}` : pasted;
+    const leftover = commitRawInput(combined);
+    setGroupRawInput(leftover);
+  }
+
+  function removeGroupTag(tag) {
+    setGroupTags((prev) => prev.filter((t) => t !== tag));
+    if (groupError) setGroupError("");
   }
 
   async function handleGroupSearch() {
-    const ids = parseGroupOrcids(groupInput);
-    if (ids.length === 0) {
-      setGroupError("Introduce al menos un ORCID iD.");
-      return;
-    }
-    const invalid = ids.filter((id) => !isValidOrcid(id));
-    if (invalid.length > 0) {
-      setGroupError(`ORCID iDs con formato incorrecto: ${invalid.join(", ")}`);
+    if (groupTags.length === 0) {
+      setGroupError("Introduce al menos un ORCID iD válido.");
       return;
     }
     setGroupError("");
     setGroupLoading(true);
     try {
-      navigate("/group", { state: { orcidIds: ids } });
+      navigate("/group", { state: { orcidIds: groupTags } });
     } finally {
       setGroupLoading(false);
     }
@@ -157,32 +208,20 @@ export function LandingPage() {
     if (event.key === "Enter") handleValidate();
   }
 
-  function handleGroupKeyDown(event) {
-    if (event.key === "Enter" && !event.shiftKey) {
-      event.preventDefault();
-      handleGroupSearch();
-    }
-  }
-
   return (
     <div className="flex min-h-screen flex-col bg-surface-tertiary">
       <AppHeader variant="landing" />
 
-      <main className="flex flex-1 flex-col items-center px-4 py-12">
+      <main className="flex flex-1 flex-col items-center px-4 pb-12 pt-16">
         <div className="w-full max-w-7xl">
 
           {/* ── Hero ── */}
           <div className="mb-12 text-center">
-            <div className="mx-auto mb-6 flex h-16 w-16 items-center justify-center rounded-2xl bg-brand-primary shadow-[0_4px_24px_rgba(11,61,107,0.18)]">
-              <DocumentIcon size={32} className="text-white" />
-            </div>
-            <h1 className="mb-3 text-[32px] font-bold tracking-tight text-ink-primary md:text-[40px]">
-              Tu producción científica,{" "}
-              <span className="text-brand-primary">siempre al día.</span>
+            <h1 className="mb-3 text-[36px] font-bold tracking-tight text-ink-primary md:text-[46px]">
+              Tus publicaciones, listas para depositar.
             </h1>
             <p className="mx-auto max-w-xl text-[16px] leading-relaxed text-ink-secondary">
-              Sincroniza tu perfil ORCID y deposita tus publicaciones
-              automáticamente vía SWORD.
+              Conecta tu ORCID y descárgalas en XML cuando quieras.
             </p>
           </div>
 
@@ -190,26 +229,45 @@ export function LandingPage() {
           <div className="grid grid-cols-1 gap-6 md:grid-cols-2 md:gap-8">
 
             {/* ── Left: individual search + login ── */}
-            <div className="flex flex-col rounded-2xl border border-surface-border/60 bg-surface-primary p-8">
+            <div className="flex flex-col rounded-2xl border border-surface-border/30 bg-surface-primary p-8 shadow-sm">
               {isAuthenticated ? (
-                <div className="flex items-center justify-between rounded-xl border border-green-200 bg-green-50 px-4 py-3 text-sm text-green-800">
-                  <span className="font-medium">Sesión activa</span>
-                  <span className="text-xs text-green-600">
-                    Verás publicaciones nuevas marcadas en el dashboard
-                  </span>
-                </div>
-              ) : (
-                <button
-                  type="button"
-                  onClick={handleOrcidLogin}
-                  disabled={loginLoading}
-                  className="flex w-full items-center justify-center gap-2.5 rounded-xl bg-orcid-green px-5 py-3.5 text-[15px] font-semibold tracking-wide text-orcid-green-dark transition-opacity enabled:hover:opacity-95 disabled:cursor-not-allowed disabled:opacity-75"
+                <Link
+                  to={userOrcidId ? `/dashboard/${userOrcidId}` : "/"}
+                  className="flex w-full items-center gap-3 rounded-xl p-2 -mx-2 transition-colors hover:bg-surface-secondary"
                 >
-                  {loginLoading ? <Spinner size={17} /> : <OrcidLogo />}
-                  {loginLoading
-                    ? "Abriendo ventana de ORCID..."
-                    : "Iniciar sesión con ORCID"}
-                </button>
+                  <div className="flex h-11 w-11 shrink-0 items-center justify-center rounded-full bg-brand-primary text-base font-semibold text-white">
+                    {getInitials(displayName ?? userOrcidId ?? "?")}
+                  </div>
+                  <div className="min-w-0 flex-1">
+                    <p className="font-semibold text-ink-primary">
+                      {displayName ?? "Mi Perfil"}
+                    </p>
+                    <div className="mt-0.5 inline-flex items-center gap-1.5 text-sm text-ink-secondary">
+                      <OrcidLogo size={14} />
+                      <span className="font-mono">{userOrcidId ?? "—"}</span>
+                    </div>
+                    <p className="mt-1 text-xs text-ink-tertiary">
+                      Verás publicaciones nuevas marcadas en el dashboard
+                    </p>
+                  </div>
+                </Link>
+              ) : (
+                <>
+                  <button
+                    type="button"
+                    onClick={handleOrcidLogin}
+                    disabled={loginLoading}
+                    className="flex w-full items-center justify-center gap-2.5 rounded-xl bg-orcid-green px-6 py-4 text-[16px] font-semibold tracking-wide text-orcid-green-dark shadow-sm transition-opacity enabled:hover:opacity-95 disabled:cursor-not-allowed disabled:opacity-75"
+                  >
+                    {loginLoading ? <Spinner size={17} /> : <OrcidLogo />}
+                    {loginLoading
+                      ? "Abriendo ventana de ORCID..."
+                      : "Iniciar sesión con ORCID"}
+                  </button>
+                  <p className="mt-2.5 text-center text-sm text-ink-tertiary">
+                    Actualizamos tus publicaciones automáticamente cada mes.
+                  </p>
+                </>
               )}
 
               <div className="my-6 flex items-center gap-3">
@@ -272,10 +330,10 @@ export function LandingPage() {
             </div>
 
             {/* ── Right: group search ── */}
-            <div className="flex flex-col rounded-2xl border border-surface-border/60 bg-surface-primary p-8">
+            <div className="flex flex-col rounded-2xl border border-surface-border/20 bg-surface-secondary p-8 shadow-sm">
               <div className="mb-3 flex items-center gap-2">
-                <UsersIcon size={18} className="text-brand-accent" />
-                <h2 className="text-[15px] font-semibold text-ink-primary">
+                <UsersIcon size={16} className="text-ink-tertiary" />
+                <h2 className="text-[14px] font-semibold text-ink-secondary">
                   Búsqueda grupal de investigadores
                 </h2>
               </div>
@@ -283,55 +341,79 @@ export function LandingPage() {
                 Pega varios ORCID iDs separados por comas, espacios o saltos de
                 línea para buscar y comparar varios investigadores a la vez.
               </p>
-              <textarea
-                rows={5}
-                placeholder={"0000-0002-1825-0097\n0000-0001-5000-0007\n0000-0003-4321-9876"}
-                value={groupInput}
-                onChange={(e) => {
-                  setGroupInput(e.target.value);
-                  if (groupError) setGroupError("");
-                }}
-                onKeyDown={handleGroupKeyDown}
-                className={`w-full flex-1 resize-none rounded-lg border px-3.5 py-3 font-mono text-[13px] text-ink-primary outline-none transition-colors ${
+              {/* ── Tag input area ── */}
+              <div
+                role="textbox"
+                aria-multiline="true"
+                aria-label="ORCID iDs"
+                onClick={() => groupInputRef.current?.focus()}
+                className={`flex min-h-[120px] cursor-text flex-wrap content-start gap-1.5 overflow-y-auto rounded-lg border px-3 py-2.5 transition-colors ${
                   groupError
                     ? "border-border-danger"
-                    : "border-surface-border-strong focus:border-brand-accent"
+                    : "border-surface-border-strong focus-within:border-brand-accent"
                 }`}
-              />
+              >
+                {groupTags.map((tag) => (
+                  <span
+                    key={tag}
+                    className="inline-flex shrink-0 items-center gap-1 rounded-full border border-[#b8d4ea] bg-[#deeef9] py-0.5 pl-1.5 pr-1 font-mono text-[11.5px] font-medium text-[#1a4a6b] transition-colors hover:bg-[#cce3f4]"
+                  >
+                    <OrcidLogo size={12} />
+                    {tag}
+                    <button
+                      type="button"
+                      onClick={(e) => { e.stopPropagation(); removeGroupTag(tag); }}
+                      aria-label={`Eliminar ${tag}`}
+                      className="ml-0.5 flex h-3.5 w-3.5 items-center justify-center rounded-full text-[#1a4a6b]/50 transition-colors hover:bg-[#1a4a6b]/15 hover:text-[#1a4a6b]"
+                    >
+                      ×
+                    </button>
+                  </span>
+                ))}
+                <input
+                  ref={groupInputRef}
+                  type="text"
+                  value={groupRawInput}
+                  onChange={handleGroupRawChange}
+                  onKeyDown={handleGroupTagKeyDown}
+                  onPaste={handleGroupPaste}
+                  placeholder={
+                    groupTags.length === 0
+                      ? "Pega o escribe ORCID iDs separados por comas, espacios o saltos de línea"
+                      : ""
+                  }
+                  className="min-w-[200px] flex-1 bg-transparent font-mono text-[13px] text-ink-primary outline-none placeholder:text-ink-tertiary/60"
+                />
+              </div>
+
               {groupError && (
                 <p className="mt-1 text-xs text-ink-danger">{groupError}</p>
               )}
+
               <button
                 type="button"
                 onClick={handleGroupSearch}
-                disabled={groupLoading || !groupInput.trim()}
-                className={`mt-4 inline-flex w-full items-center justify-center gap-2 rounded-lg px-5 py-3 text-sm font-medium transition-colors ${
-                  groupInput.trim()
-                    ? "bg-brand-primary text-white enabled:hover:bg-brand-primary-hover"
-                    : "bg-surface-secondary text-ink-tertiary"
-                } disabled:cursor-not-allowed`}
+                disabled={groupLoading || groupTags.length === 0}
+                className={`mt-4 inline-flex w-full items-center justify-center gap-2 rounded-lg px-5 py-3 text-sm font-medium transition-colors disabled:cursor-not-allowed disabled:opacity-40 ${
+                  groupTags.length > 0
+                    ? "bg-brand-primary text-white hover:bg-brand-primary-hover"
+                    : "border border-surface-border bg-surface-secondary text-ink-tertiary"
+                }`}
               >
                 {groupLoading && <Spinner size={14} />}
                 <UsersIcon size={14} />
-                {groupLoading ? "Preparando..." : "Buscar investigadores"}
+                {groupLoading
+                  ? "Preparando..."
+                  : groupTags.length > 1
+                    ? `Buscar ${groupTags.length} investigadores`
+                    : "Buscar investigadores"}
               </button>
             </div>
           </div>
 
-          {/* ── Info chips ── */}
-          <div className="mt-8 flex flex-wrap justify-center gap-4">
-            {["ORCID OAuth 2.0", "SWORD v2", "DSpace · EPrints"].map((label) => (
-              <span
-                key={label}
-                className="rounded-full border border-surface-border/60 bg-surface-secondary px-3.5 py-1.5 text-xs text-ink-tertiary"
-              >
-                {label}
-              </span>
-            ))}
-          </div>
-
         </div>
       </main>
+      <Footer />
     </div>
   );
 }

frontend/src/services/api.js

@@ -237,9 +237,11 @@ export function getOrcidAuthorizeUrl() {
  * Intercambia el authorization code (recibido de ORCID tras el OAuth)
  * por un JWT propio del backend. Devuelve `{ access_token, token_type }`.
  */
-export async function exchangeOrcidCode(code, { signal } = {}) {
+export async function exchangeOrcidCode(code, { state, signal } = {}) {
+  const params = { code };
+  if (state) params.state = state;
   return request(
-    `/auth/orcid/callback?${new URLSearchParams({ code }).toString()}`,
+    `/auth/orcid/callback?${new URLSearchParams(params).toString()}`,
     { signal },
   );
 }