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QCrypt RNG - API Middleware
Enterprise-grade middleware for rate limiting, authentication, and monitoring
"""
from fastapi import Request, HTTPException, status
from fastapi.responses import JSONResponse
import hashlib
import hmac as _hmac
import time
import asyncio
from typing import Callable, Awaitable, Optional, Set
from app.utils.rate_limiting import rate_limiter
from app.config import settings
from app.utils.logging import logger, get_security_logger
_security_log = get_security_logger()
# ---------------------------------------------------------------------------
# API key allow-list (loaded once at import time from settings)
# ---------------------------------------------------------------------------
def _load_valid_api_keys() -> Optional[Set[str]]:
"""Parse VALID_API_KEYS from settings into a frozen set.
Returns None when no allow-list is configured (fall back to
length-based validation).
"""
raw = settings.valid_api_keys
if not raw:
return None
keys = {k.strip() for k in raw.split(",") if k.strip()}
return keys if keys else None
_VALID_API_KEYS: Optional[Set[str]] = _load_valid_api_keys()
def _constant_time_key_check(candidate: str, valid_keys: Set[str]) -> bool:
"""Check membership with constant-time comparison per key."""
candidate_bytes = candidate.encode("utf-8")
found = False
for key in valid_keys:
if _hmac.compare_digest(candidate_bytes, key.encode("utf-8")):
found = True
return found
def _mask_api_key(api_key: str) -> str:
"""Return a safe prefix hash for audit logs (never log the raw key)."""
return hashlib.sha256(api_key.encode("utf-8")).hexdigest()[:12]
async def rate_limit_middleware(
request: Request,
call_next: Callable[[Request], Awaitable[any]]
):
"""
Rate limiting middleware that checks usage against tier limits
"""
if not settings.enable_usage_tracking:
return await call_next(request)
# Extract API key from header
api_key = request.headers.get(settings.api_key_header, "")
# Skip rate limiting for certain endpoints or if API key is not required
if not settings.require_api_key and not api_key:
return await call_next(request)
# Check rate limit
is_allowed, remaining, reset_time = await rate_limiter.check_limit(
api_key,
request.url.path
)
if not is_allowed:
client_ip = request.client.host if request.client else "unknown"
_security_log.warning(
f"rate_limit_exceeded | IP: {client_ip} | "
f"Path: {request.method} {request.url.path} | "
f"Key: {_mask_api_key(api_key) if api_key else 'none'} | "
f"Reset: {reset_time}s"
)
return JSONResponse(
status_code=status.HTTP_429_TOO_MANY_REQUESTS,
content={
"error": "rate_limit_exceeded",
"message": f"Rate limit exceeded. Try again in {reset_time} seconds.",
"remaining_requests": 0,
"reset_time": reset_time
}
)
# Record start time for response time tracking
start_time = time.time()
try:
response = await call_next(request)
# Calculate response time
response_time = time.time() - start_time
# Record usage
await rate_limiter.record_usage(
api_key=api_key,
endpoint=request.url.path,
method=request.method,
response_time=response_time,
bytes_processed=int(response.headers.get("content-length", 0)),
success=response.status_code < 400
)
# Increment usage counters
content_length = int(response.headers.get("content-length", 0))
await rate_limiter.increment_usage(api_key, content_length)
# Add rate limit headers to response
response.headers["X-RateLimit-Remaining"] = str(remaining - 1)
response.headers["X-RateLimit-Reset"] = str(reset_time)
response.headers["X-Response-Time"] = f"{response_time:.3f}s"
return response
except Exception as e:
# Calculate response time even for errors
response_time = time.time() - start_time
# Record error in usage tracking
await rate_limiter.record_usage(
api_key=api_key,
endpoint=request.url.path,
method=request.method,
response_time=response_time,
bytes_processed=0,
success=False
)
# Increment usage counters even for errors (failed requests still count)
await rate_limiter.increment_usage(api_key, 0)
raise
async def api_key_middleware(
request: Request,
call_next: Callable[[Request], Awaitable[any]]
):
"""
API key validation middleware.
When VALID_API_KEYS is configured, the key is checked against that
allow-list using constant-time comparison. Otherwise falls back to
a minimum-length check so existing setups keep working.
"""
if not settings.require_api_key:
return await call_next(request)
client_ip = request.client.host if request.client else "unknown"
api_key = request.headers.get(settings.api_key_header)
if not api_key:
_security_log.warning(
f"api_key_missing | IP: {client_ip} | "
f"Path: {request.method} {request.url.path}"
)
return JSONResponse(
status_code=status.HTTP_401_UNAUTHORIZED,
content={"error": "api_key_required", "message": f"API key required in {settings.api_key_header} header"}
)
# Validate against the allow-list when configured
if _VALID_API_KEYS is not None:
if not _constant_time_key_check(api_key, _VALID_API_KEYS):
_security_log.warning(
f"api_key_invalid | IP: {client_ip} | "
f"Path: {request.method} {request.url.path} | "
f"KeyHash: {_mask_api_key(api_key)}"
)
return JSONResponse(
status_code=status.HTTP_401_UNAUTHORIZED,
content={"error": "invalid_api_key", "message": "Invalid API key"}
)
else:
# Fallback: basic length validation
if len(api_key) < 10:
_security_log.warning(
f"api_key_invalid | IP: {client_ip} | "
f"Path: {request.method} {request.url.path} | "
f"Reason: key too short"
)
return JSONResponse(
status_code=status.HTTP_401_UNAUTHORIZED,
content={"error": "invalid_api_key", "message": "Invalid API key format"}
)
# Add API key to request state for later use
request.state.api_key = api_key
return await call_next(request)
async def monitoring_middleware(
request: Request,
call_next: Callable[[Request], Awaitable[any]]
):
"""
Monitoring and analytics middleware
"""
start_time = time.time()
# Log incoming request
if settings.enable_detailed_logging:
logger.info(f"Request: {request.method} {request.url.path} - IP: {request.client.host}")
try:
response = await call_next(request)
# Calculate processing time
process_time = time.time() - start_time
# Add timing header
response.headers["X-Process-Time"] = f"{process_time*1000:.2f}ms"
# Log response if detailed logging is enabled
if settings.enable_detailed_logging:
logger.info(f"Response: {response.status_code} - Time: {process_time*1000:.2f}ms")
return response
except Exception as e:
process_time = time.time() - start_time
# Log error
logger.error(f"Error in {request.method} {request.url.path}: {str(e)} - Time: {process_time*1000:.2f}ms")
# Re-raise the exception to be handled by FastAPI's exception handlers
raise |