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"""
FastAPI dependencies for authentication, services, and common utilities.
This module provides reusable dependencies for FastAPI endpoints,
including authentication, service injection, and request validation.
"""
import logging
from typing import Dict, Any, Optional
from fastapi import Depends, HTTPException, status, Request, Header
from redis.asyncio import Redis
from ..core.auth import verify_clerk_token, AuthenticationError, extract_bearer_token
from ..core.redis import get_redis
from ..services.video_service import VideoService
from ..services.job_service import JobService
from ..services.queue_service import QueueService
from ..services.file_service import FileService
logger = logging.getLogger(__name__)
async def get_current_user(
authorization: Optional[str] = Header(None),
redis_client: Redis = Depends(get_redis)
) -> Dict[str, Any]:
"""
FastAPI dependency to get current authenticated user.
Extracts and validates the Clerk session token from the Authorization header,
then returns user information and token claims.
Args:
authorization: Authorization header with Bearer token
redis_client: Redis client for caching user info
Returns:
Dict containing user information and token claims
Raises:
HTTPException: If authentication fails
"""
try:
if not authorization:
raise AuthenticationError("Missing authorization header")
# Extract bearer token
token = extract_bearer_token(authorization)
# Verify token and get user info
auth_info = await verify_clerk_token(token)
# Extract email safely for logging
user_info = auth_info["user_info"]
user_id = user_info.get("id", "unknown")
# Extract email from email_addresses array if available
email = user_info.get("email")
if not email and "email_addresses" in user_info:
email_addresses = user_info.get("email_addresses", [])
if email_addresses:
primary_email_id = user_info.get("primary_email_address_id")
if primary_email_id:
primary_email = next((e for e in email_addresses if e.get("id") == primary_email_id), None)
if primary_email:
email = primary_email.get("email_address")
# Fallback to first email
if not email:
email = email_addresses[0].get("email_address")
logger.debug(
"User authenticated successfully",
user_id=user_id,
email=email or "no-email"
)
return auth_info
except AuthenticationError as e:
logger.warning(f"Authentication failed: {e}")
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail=str(e),
headers={"WWW-Authenticate": "Bearer"}
)
except Exception as e:
logger.error(f"Authentication error: {e}", exc_info=True)
raise HTTPException(
status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
detail="Authentication service error"
)
async def get_optional_user(
authorization: Optional[str] = Header(None),
redis_client: Redis = Depends(get_redis)
) -> Optional[Dict[str, Any]]:
"""
FastAPI dependency to get current user if authenticated (optional).
Similar to get_current_user but returns None if no authentication
is provided instead of raising an exception.
Args:
authorization: Authorization header with Bearer token (optional)
redis_client: Redis client for caching user info
Returns:
Dict containing user information or None if not authenticated
"""
try:
if not authorization:
return None
return await get_current_user(authorization, redis_client)
except HTTPException:
# Return None for optional authentication
return None
except Exception as e:
logger.error(f"Optional authentication error: {e}", exc_info=True)
return None
def get_video_service(
redis_client: Redis = Depends(get_redis)
) -> VideoService:
"""
FastAPI dependency to get VideoService instance.
Args:
redis_client: Redis client dependency
Returns:
VideoService instance
"""
return VideoService(redis_client)
def get_job_service(
redis_client: Redis = Depends(get_redis)
) -> JobService:
"""
FastAPI dependency to get JobService instance.
Args:
redis_client: Redis client dependency
Returns:
JobService instance
"""
return JobService(redis_client)
def get_queue_service(
redis_client: Redis = Depends(get_redis)
) -> QueueService:
"""
FastAPI dependency to get QueueService instance.
Args:
redis_client: Redis client dependency
Returns:
QueueService instance
"""
return QueueService(redis_client)
def get_file_service(
redis_client: Redis = Depends(get_redis)
) -> FileService:
"""
FastAPI dependency to get FileService instance.
Args:
redis_client: Redis client dependency
Returns:
FileService instance
"""
return FileService(redis_client)
class PaginationParams:
"""
Pagination parameters for list endpoints.
"""
def __init__(
self,
page: int = 1,
items_per_page: int = 10,
max_items_per_page: int = 100
):
# Validate page number
if page < 1:
raise HTTPException(
status_code=status.HTTP_400_BAD_REQUEST,
detail="Page number must be greater than 0"
)
# Validate items per page
if items_per_page < 1:
raise HTTPException(
status_code=status.HTTP_400_BAD_REQUEST,
detail="Items per page must be greater than 0"
)
if items_per_page > max_items_per_page:
raise HTTPException(
status_code=status.HTTP_400_BAD_REQUEST,
detail=f"Items per page cannot exceed {max_items_per_page}"
)
self.page = page
self.items_per_page = items_per_page
self.offset = (page - 1) * items_per_page
@property
def limit(self) -> int:
"""Get limit for database queries."""
return self.items_per_page
def get_pagination_params(
page: int = 1,
items_per_page: int = 10
) -> PaginationParams:
"""
FastAPI dependency to get pagination parameters.
Args:
page: Page number (1-based)
items_per_page: Number of items per page
Returns:
PaginationParams instance
Raises:
HTTPException: If parameters are invalid
"""
return PaginationParams(page=page, items_per_page=items_per_page)
class JobFilters:
"""
Filtering parameters for job list endpoints.
"""
def __init__(
self,
status: Optional[str] = None,
job_type: Optional[str] = None,
priority: Optional[str] = None,
created_after: Optional[str] = None,
created_before: Optional[str] = None
):
self.status = status
self.job_type = job_type
self.priority = priority
self.created_after = created_after
self.created_before = created_before
def to_dict(self) -> Dict[str, Any]:
"""Convert filters to dictionary for service layer."""
return {
k: v for k, v in {
"status": self.status,
"job_type": self.job_type,
"priority": self.priority,
"created_after": self.created_after,
"created_before": self.created_before
}.items() if v is not None
}
def get_job_filters(
status: Optional[str] = None,
job_type: Optional[str] = None,
priority: Optional[str] = None,
created_after: Optional[str] = None,
created_before: Optional[str] = None
) -> JobFilters:
"""
FastAPI dependency to get job filtering parameters.
Args:
status: Filter by job status
job_type: Filter by job type
priority: Filter by job priority
created_after: Filter jobs created after this date (ISO format)
created_before: Filter jobs created before this date (ISO format)
Returns:
JobFilters instance
"""
return JobFilters(
status=status,
job_type=job_type,
priority=priority,
created_after=created_after,
created_before=created_before
)
def validate_job_ownership(
job_user_id: str,
current_user: Dict[str, Any]
) -> None:
"""
Validate that the current user owns the specified job.
Args:
job_user_id: User ID from the job
current_user: Current authenticated user
Raises:
HTTPException: If user doesn't own the job
"""
if job_user_id != current_user["user_info"]["id"]:
raise HTTPException(
status_code=status.HTTP_403_FORBIDDEN,
detail="Access denied: You don't own this resource"
)
def validate_request_size(
request: Request,
max_size_mb: int = 10
) -> None:
"""
Validate request content size.
Args:
request: FastAPI request object
max_size_mb: Maximum allowed size in MB
Raises:
HTTPException: If request is too large
"""
content_length = request.headers.get("content-length")
if content_length:
size_mb = int(content_length) / (1024 * 1024)
if size_mb > max_size_mb:
raise HTTPException(
status_code=status.HTTP_413_REQUEST_ENTITY_TOO_LARGE,
detail=f"Request too large. Maximum size: {max_size_mb}MB"
)
async def rate_limit_check(
current_user: Dict[str, Any],
redis_client: Redis,
operation: str,
limit: int = 10,
window_seconds: int = 60
) -> None:
"""
Check rate limits for user operations.
Args:
current_user: Current authenticated user
redis_client: Redis client for rate limit storage
operation: Operation name for rate limiting
limit: Maximum operations per window
window_seconds: Time window in seconds
Raises:
HTTPException: If rate limit exceeded
"""
user_id = current_user["user_info"]["id"]
key = f"rate_limit:{user_id}:{operation}"
try:
# Get current count
current_count = await redis_client.get(key)
current_count = int(current_count) if current_count else 0
if current_count >= limit:
raise HTTPException(
status_code=status.HTTP_429_TOO_MANY_REQUESTS,
detail=f"Rate limit exceeded for {operation}. Try again later.",
headers={"Retry-After": str(window_seconds)}
)
# Increment counter
pipe = redis_client.pipeline()
pipe.incr(key)
pipe.expire(key, window_seconds)
await pipe.execute()
except HTTPException:
raise
except Exception as e:
logger.error(f"Rate limit check failed: {e}", exc_info=True)
# Don't block requests if rate limiting fails
pass
# Additional authentication dependencies for compatibility
async def get_authenticated_user(
authorization: Optional[str] = Header(None),
redis_client: Redis = Depends(get_redis)
) -> Dict[str, Any]:
"""
Alias for get_current_user for backward compatibility.
Returns the user_info portion of the authentication data.
"""
auth_info = await get_current_user(authorization, redis_client)
return auth_info["user_info"]
async def get_authenticated_user_id(
authorization: Optional[str] = Header(None),
redis_client: Redis = Depends(get_redis)
) -> str:
"""
Get just the user ID from authentication.
Returns:
str: The authenticated user's ID
"""
auth_info = await get_current_user(authorization, redis_client)
return auth_info["user_info"]["id"]
async def get_verified_user(
authorization: Optional[str] = Header(None),
redis_client: Redis = Depends(get_redis)
) -> Dict[str, Any]:
"""
Get authenticated user that has verified email.
Returns:
Dict containing verified user information
Raises:
HTTPException: If user is not verified
"""
auth_info = await get_current_user(authorization, redis_client)
user_info = auth_info["user_info"]
# Check email verification status from email_addresses array
email_verified = user_info.get("email_verified", False)
# If not directly available, check in email_addresses array
if not email_verified and "email_addresses" in user_info:
email_addresses = user_info.get("email_addresses", [])
if email_addresses:
primary_email_id = user_info.get("primary_email_address_id")
if primary_email_id:
primary_email = next((e for e in email_addresses if e.get("id") == primary_email_id), None)
if primary_email:
verification = primary_email.get("verification", {})
email_verified = verification.get("status") == "verified"
# Fallback to first email verification
if not email_verified and email_addresses:
first_email = email_addresses[0]
verification = first_email.get("verification", {})
email_verified = verification.get("status") == "verified"
if not email_verified:
raise HTTPException(
status_code=status.HTTP_403_FORBIDDEN,
detail="Email verification required"
)
return user_info
async def get_request_context(request: Request) -> Dict[str, Any]:
"""
Get request context information.
Args:
request: FastAPI request object
Returns:
Dict containing request context
"""
return {
"path": str(request.url.path),
"method": request.method,
"client_ip": request.client.host if request.client else "unknown",
"user_agent": request.headers.get("user-agent", "unknown"),
"timestamp": logger.info("Request context retrieved")
} |