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import time
from typing import Any
from uuid import uuid4
from fastapi import Request
from fastapi.responses import JSONResponse
from starlette.middleware.base import BaseHTTPMiddleware, RequestResponseEndpoint
from starlette.responses import Response
from app.core.config import Settings
from app.core.logger import get_logger
from app.security.audit import AuditService
from app.security.context import AuthContext, auth_context, http_auth_applied
from app.security.errors import ForbiddenError, RateLimitError, UnauthorizedError
from app.security.policy import ScopePolicy
from app.security.rate_limit import APIKeyRateLimiter, RateLimitLease
from app.security.service import APIKeyService
from app.security.studio_identity import constrain_context_to_membership, verify_studio_identity
logger = get_logger(__name__)
class APIKeyAuthenticationMiddleware(BaseHTTPMiddleware):
"""Authenticates, authorizes, rate-limits, and audits protected HTTP requests."""
def __init__(
self,
app: Any,
*,
settings: Settings,
api_keys: APIKeyService,
rate_limiter: APIKeyRateLimiter,
audit: AuditService,
) -> None:
super().__init__(app)
self.settings = settings
self.api_keys = api_keys
self.rate_limiter = rate_limiter
self.audit = audit
self.policy = ScopePolicy()
async def dispatch(self, request: Request, call_next: RequestResponseEndpoint) -> Response:
if not getattr(request.state, "request_id", None):
request.state.request_id = str(uuid4())
if not self.settings.auth_enabled or self.policy.is_public(request):
return await call_next(request)
started = time.monotonic()
context: AuthContext | None = None
lease: RateLimitLease | None = None
context_token = None
http_auth_token = None
response_code = 500
required_scope: str | None = None
bytes_uploaded = self._content_length(request.headers.get("content-length"))
bytes_downloaded = 0
try:
api_key = self._bearer_token(request.headers.get("authorization"))
context = await self.api_keys.authenticate(api_key)
studio_header_names = (
"x-mr-studio-subject",
"x-mr-studio-email",
"x-mr-studio-name",
"x-mr-studio-timestamp",
"x-mr-studio-signature",
)
if any(request.headers.get(name) is not None for name in studio_header_names):
secret = (
self.settings.studio_identity_secret.get_secret_value()
if self.settings.studio_identity_secret
else ""
)
try:
identity = verify_studio_identity(request.headers, secret)
except ValueError as exc:
logger.warning("rejected Studio identity envelope: %s", str(exc))
raise UnauthorizedError from exc
principal = await self.api_keys.tenants.resolve_studio_subject(identity.subject)
request.state.studio_identity_verified = True
try:
# The shared key authenticates transport only; persisted
# membership capabilities constrain its effective scopes.
context = constrain_context_to_membership(context, principal)
except ValueError as exc:
logger.warning("rejected Studio membership role: %s", str(exc))
raise ForbiddenError from exc
request.state.auth = context
context_token = auth_context.set(context)
required_scope = await self.policy.required_scope(request)
lease = await self.rate_limiter.acquire(
context,
is_job=self.policy.is_job(required_scope)
or request.url.path.startswith("/v1/projects/")
and "/renders" in request.url.path
and request.method == "POST",
is_upload=self.policy.is_upload(request, required_scope),
uploaded_bytes=bytes_uploaded,
)
if context.membership_role == "viewer" and required_scope not in {
"templates:read",
"operations:read",
"jobs:read",
"assets:read",
"mcp:read",
"system:read",
"social:accounts:read",
"social:posts:read",
"social:schedules:read",
"social:analytics:read",
"analytics:read",
"generation:providers:read",
"generation:requests:read",
"ai:read",
"copilot:read",
"projects:read",
"members:read",
"teams:read",
"projects:collaborate",
"comments:read",
"approvals:read",
}:
raise ForbiddenError
self.api_keys.authorize(context, required_scope)
await self._apply_social_rate_limit(request, context)
await self.api_keys.mark_used(context)
http_auth_token = http_auth_applied.set(True)
response = await call_next(request)
response_code = response.status_code
bytes_downloaded = self._content_length(response.headers.get("content-length"))
response.headers.setdefault("X-Request-ID", request.state.request_id)
return response
except UnauthorizedError:
response_code = 401
return self._error(
401,
"Unauthorized",
"Invalid or expired API key.",
request,
{"WWW-Authenticate": "Bearer"},
)
except ForbiddenError:
response_code = 403
detail = f"Missing required scope: {required_scope}." if required_scope else "Workspace identity or membership authorization was denied."
response = self._error(403, "Forbidden", detail, request)
bytes_downloaded = len(response.body)
return response
except RateLimitError as exc:
response_code = 429
response = self._error(
429,
"Rate limit exceeded",
"Retry later.",
request,
{"Retry-After": str(exc.retry_after)},
)
bytes_downloaded = len(response.body)
return response
finally:
if lease is not None:
await lease.release()
if http_auth_token is not None:
http_auth_applied.reset(http_auth_token)
if context_token is not None:
auth_context.reset(context_token)
if context is not None:
elapsed_ms = max(0, round((time.monotonic() - started) * 1000))
await self._audit_request(
request,
context,
response_code,
elapsed_ms,
bytes_uploaded,
bytes_downloaded,
)
async def _apply_social_rate_limit(self, request: Request, context: AuthContext) -> None:
path = request.url.path
if path.startswith("/v1/analytics"):
category = "analytics_sync" if path.endswith(("/sync", "/cancel")) else "analytics_read"
limit = (
max(1, self.settings.social_analytics_requests_per_minute // 6)
if category == "analytics_sync"
else self.settings.social_analytics_requests_per_minute
)
await self.rate_limiter.acquire_category(
context,
category,
limit=limit,
window_seconds=60,
)
return
if not path.startswith("/v1/social"):
return
if "/analytics" in path:
await self.rate_limiter.acquire_category(
context,
"social_analytics",
limit=self.settings.social_analytics_requests_per_minute,
window_seconds=60,
)
elif path.endswith("/connect") or path.endswith("/callback") or path.endswith("/refresh"):
await self.rate_limiter.acquire_category(
context,
"social_oauth",
limit=self.settings.social_oauth_requests_per_hour,
window_seconds=3600,
)
elif path.endswith("/publish"):
await self.rate_limiter.acquire_category(
context,
"social_publish",
limit=self.settings.social_publish_requests_per_minute,
window_seconds=60,
)
elif path.endswith("/schedule"):
await self.rate_limiter.acquire_category(
context,
"social_schedule",
limit=self.settings.social_schedule_requests_per_minute,
window_seconds=60,
)
elif "/batch" in path:
await self.rate_limiter.acquire_category(
context,
"social_publish",
limit=self.settings.social_publish_requests_per_minute,
window_seconds=60,
)
async def _audit_request(
self,
request: Request,
context: AuthContext,
response_code: int,
elapsed_ms: int,
bytes_uploaded: int,
bytes_downloaded: int,
) -> None:
try:
await self.audit.record(
request_id=str(getattr(request.state, "request_id", ""))[:64],
api_key_id=str(context.api_key_id),
key_name=str(getattr(context, "key_name", ""))[:128],
ip_address=request.client.host if request.client else None,
user_agent=request.headers.get("user-agent", "")[:512] or None,
endpoint=request.url.path[:512],
http_method=request.method[:16],
response_code=response_code,
processing_time_ms=elapsed_ms,
bytes_uploaded=max(0, bytes_uploaded),
bytes_downloaded=max(0, bytes_downloaded),
)
except Exception:
logger.exception("failed to persist API request audit record")
@staticmethod
def _error(
status_code: int,
error: str,
message: str,
request: Request,
headers: dict[str, str] | None = None,
) -> JSONResponse:
response_headers = dict(headers or {})
request_id = str(getattr(request.state, "request_id", ""))
if request_id:
response_headers.setdefault("X-Request-ID", request_id)
return JSONResponse(
status_code=status_code,
headers=response_headers,
content={
"error": {
"code": error,
"message": message,
"request_id": request_id,
}
},
)
@staticmethod
def _bearer_token(value: str | None) -> str:
if not value:
raise UnauthorizedError
scheme, separator, token = value.partition(" ")
if not separator or scheme.casefold() != "bearer" or not token.strip():
raise UnauthorizedError
return token.strip()
@staticmethod
def _content_length(value: str | None) -> int:
if not value:
return 0
try:
parsed = int(value)
except (TypeError, ValueError):
return 0
return max(0, parsed)
|