128 lines
4.1 KiB
Python
128 lines
4.1 KiB
Python
"""Authentication service: password hashing, JWT creation/verification, token management."""
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import os
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from datetime import datetime, timedelta, timezone
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from typing import Any
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from ..db import get_conn, get_write_lock
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_pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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ACCESS_TOKEN_EXPIRE_MINUTES = 15
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REFRESH_TOKEN_EXPIRE_DAYS = 7
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ALGORITHM = "HS256"
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def _secret() -> str:
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secret = os.getenv("JWT_SECRET")
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if not secret:
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raise RuntimeError("JWT_SECRET environment variable is not set.")
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return secret
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# --- Password ---
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def hash_password(plain: str) -> str:
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return _pwd_context.hash(plain)
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def verify_password(plain: str, hashed: str) -> bool:
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return _pwd_context.verify(plain, hashed)
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# --- Tokens ---
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def create_access_token(user_id: str, email: str, role: str) -> str:
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expire = datetime.now(timezone.utc) + \
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timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
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payload = {
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"sub": user_id,
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"email": email,
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"role": role,
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"exp": expire,
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"type": "access",
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}
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return jwt.encode(payload, _secret(), algorithm=ALGORITHM)
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def create_refresh_token(user_id: str, jti: str) -> str:
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expire = datetime.now(timezone.utc) + \
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timedelta(days=REFRESH_TOKEN_EXPIRE_DAYS)
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payload = {
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"sub": user_id,
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"jti": jti,
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"exp": expire,
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"type": "refresh",
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}
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return jwt.encode(payload, _secret(), algorithm=ALGORITHM)
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def decode_token(token: str) -> dict[str, Any]:
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"""Decode and validate a JWT. Raises JWTError on failure."""
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return jwt.decode(token, _secret(), algorithms=[ALGORITHM])
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# --- Database operations ---
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async def register_user(email: str, password: str) -> dict[str, Any]:
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"""Insert a new user. Returns the created user row."""
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conn = get_conn()
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lock = get_write_lock()
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sql_check = "SELECT id FROM users WHERE email = ?"
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sql_insert = "INSERT INTO users (email, password_hash) VALUES (?, ?)"
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sql_fetch = "SELECT id, email, role FROM users WHERE email = ?"
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async with lock:
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existing = conn.execute(sql_check, [email]).fetchone()
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if existing:
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raise ValueError("Email already registered.")
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conn.execute(sql_insert, [email, hash_password(password)],)
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row = conn.execute(sql_fetch, [email]).fetchone()
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if row is None:
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raise RuntimeError("Failed to fetch user after registration.")
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return {"id": str(row[0]), "email": row[1], "role": row[2]}
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async def authenticate_user(email: str, password: str) -> dict[str, Any] | None:
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"""Return user dict if credentials are valid, else None."""
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conn = get_conn()
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sql_fetch = "SELECT id, email, password_hash, role FROM users WHERE email = ?"
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row = conn.execute(sql_fetch, [email]).fetchone()
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if row is None or not verify_password(password, row[2]):
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return None
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return {"id": str(row[0]), "email": row[1], "role": row[3]}
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async def store_refresh_token(user_id: str, jti: str) -> None:
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"""Persist a refresh token JTI in the database."""
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conn = get_conn()
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lock = get_write_lock()
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sql_insert = "INSERT INTO refresh_tokens (jti, user_id, expires_at) VALUES (?, ?, ?)"
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from datetime import timedelta
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expires_at = datetime.now(timezone.utc) + \
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timedelta(days=REFRESH_TOKEN_EXPIRE_DAYS)
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async with lock:
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conn.execute(sql_insert, [jti, user_id, expires_at])
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async def revoke_refresh_token(jti: str) -> None:
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"""Mark a refresh token as revoked."""
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conn = get_conn()
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lock = get_write_lock()
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sql_update = "UPDATE refresh_tokens SET revoked = true WHERE jti = ?"
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async with lock:
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conn.execute(sql_update, [jti])
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async def validate_refresh_token_jti(jti: str, user_id: str) -> bool:
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"""Return True if the JTI exists, is not revoked, and belongs to user_id."""
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conn = get_conn()
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now = datetime.now(timezone.utc)
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sql_select = """
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SELECT 1 FROM refresh_tokens
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WHERE jti = ? AND user_id = ? AND revoked = false AND expires_at > ?
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"""
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row = conn.execute(sql_select, [jti, user_id, now]).fetchone()
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return row is not None
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