Agrega backend FastAPI al proyecto

recolector_backend/app/security.py

@@ -0,0 +1,95 @@
+import hashlib
+import hmac
+import os
+import re
+from datetime import datetime, timedelta, timezone
+from typing import Annotated
+
+import jwt
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from sqlalchemy.orm import Session
+
+from app.config import settings
+from app.database import get_db
+from app.models import User
+
+ALGORITHM = "HS256"
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/login")
+EMAIL_RE = re.compile(r"^[^\s@]+@[^\s@]+\.[^\s@]+$")
+ADDRESS_RE = re.compile(r"^(?=.*[A-Za-zÁÉÍÓÚáéíóúÑñ])(?=.*\d).{8,}$")
+
+
+def hash_password(password: str) -> str:
+    salt = os.urandom(16).hex()
+    digest = hashlib.pbkdf2_hmac("sha256", password.encode(), salt.encode(), 120_000).hex()
+    return f"pbkdf2_sha256${salt}${digest}"
+
+
+def verify_password(password: str, stored: str) -> bool:
+    try:
+        algo, salt, digest = stored.split("$")
+        if algo != "pbkdf2_sha256":
+            return False
+        candidate = hashlib.pbkdf2_hmac("sha256", password.encode(), salt.encode(), 120_000).hex()
+        return hmac.compare_digest(candidate, digest)
+    except ValueError:
+        return False
+
+
+def create_access_token(user: User) -> str:
+    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.jwt_expire_minutes)
+    payload = {
+        "sub": str(user.id),
+        "email": user.email,
+        "role": user.role,
+        "exp": expire,
+    }
+    return jwt.encode(payload, settings.jwt_secret, algorithm=ALGORITHM)
+
+
+def get_current_user(
+    token: Annotated[str, Depends(oauth2_scheme)],
+    db: Annotated[Session, Depends(get_db)],
+) -> User:
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Token inválido o expirado",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+
+    try:
+        payload = jwt.decode(token, settings.jwt_secret, algorithms=[ALGORITHM])
+        user_id = int(payload.get("sub"))
+    except Exception as exc:
+        raise credentials_exception from exc
+
+    user = db.get(User, user_id)
+    if not user or not user.active:
+        raise credentials_exception
+    return user
+
+
+def require_role(*roles: str):
+    def dependency(current_user: Annotated[User, Depends(get_current_user)]) -> User:
+        if current_user.role not in roles:
+            raise HTTPException(status_code=403, detail="No tienes permisos para esta acción")
+        return current_user
+    return dependency
+
+
+def validate_email(email: str) -> str:
+    email = email.strip().lower()
+    if not EMAIL_RE.match(email):
+        raise HTTPException(status_code=422, detail="Correo inválido")
+    return email
+
+
+def validate_address(address: str) -> str:
+    value = " ".join(address.strip().split())
+    if not ADDRESS_RE.match(value):
+        raise HTTPException(
+            status_code=422,
+            detail="Dirección inválida. Debe incluir calle y número. Ejemplo: Calle Luna 123",
+        )
+    return value