113 lines
3.9 KiB
Python
113 lines
3.9 KiB
Python
"""FastAPI entrypoint for the DMS backend service."""
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from typing import Awaitable, Callable
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from fastapi import FastAPI, Request, Response
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.responses import JSONResponse
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from app.api.router import api_router
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from app.core.config import get_settings
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from app.db.base import init_db
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from app.services.app_settings import ensure_app_settings
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from app.services.handwriting_style import ensure_handwriting_style_collection
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from app.services.storage import ensure_storage
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from app.services.typesense_index import ensure_typesense_collection
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settings = get_settings()
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UPLOAD_ENDPOINT_PATH = "/api/v1/documents/upload"
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UPLOAD_ENDPOINT_METHOD = "POST"
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DEVELOPMENT_CORS_PRIVATE_ORIGIN_REGEX = (
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r"^https?://("
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r"localhost"
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r"|127(?:\.\d{1,3}){3}"
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r"|0\.0\.0\.0"
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r"|10(?:\.\d{1,3}){3}"
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r"|192\.168(?:\.\d{1,3}){2}"
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r"|172\.(?:1[6-9]|2\d|3[0-1])(?:\.\d{1,3}){2}"
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r")(?::\d+)?$"
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)
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def _is_upload_size_guard_target(request: Request) -> bool:
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"""Returns whether upload request-size enforcement applies to this request.
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Upload-size validation is intentionally scoped to the upload POST endpoint so CORS
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preflight OPTIONS requests can pass through CORSMiddleware.
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"""
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return request.method.upper() == UPLOAD_ENDPOINT_METHOD and request.url.path == UPLOAD_ENDPOINT_PATH
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def create_app() -> FastAPI:
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"""Builds and configures the FastAPI application instance."""
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app = FastAPI(title="DCM DMS API", version="0.1.0")
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app_env = settings.app_env.strip().lower()
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allow_origin_regex = (
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DEVELOPMENT_CORS_PRIVATE_ORIGIN_REGEX if app_env in {"development", "dev"} else None
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)
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app.add_middleware(
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CORSMiddleware,
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allow_origins=settings.cors_origins,
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allow_origin_regex=allow_origin_regex,
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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app.include_router(api_router, prefix="/api/v1")
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@app.middleware("http")
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async def enforce_upload_request_size(
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request: Request,
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call_next: Callable[[Request], Awaitable[Response]],
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) -> Response:
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"""Rejects only POST upload bodies without deterministic length or with oversized request totals."""
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if _is_upload_size_guard_target(request):
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content_length = request.headers.get("content-length", "").strip()
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if not content_length:
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return JSONResponse(
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status_code=411,
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content={"detail": "Content-Length header is required for document uploads"},
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)
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try:
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content_length_value = int(content_length)
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except ValueError:
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return JSONResponse(status_code=400, content={"detail": "Invalid Content-Length header"})
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if content_length_value <= 0:
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return JSONResponse(status_code=400, content={"detail": "Content-Length must be a positive integer"})
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if content_length_value > settings.max_upload_request_size_bytes:
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return JSONResponse(
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status_code=413,
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content={
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"detail": (
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"Upload request exceeds total size limit "
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f"({content_length_value} > {settings.max_upload_request_size_bytes} bytes)"
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)
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},
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)
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return await call_next(request)
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@app.on_event("startup")
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def startup_event() -> None:
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"""Initializes storage directories and database schema on service startup."""
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ensure_storage()
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ensure_app_settings()
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init_db()
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try:
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ensure_typesense_collection()
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except Exception:
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pass
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try:
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ensure_handwriting_style_collection()
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except Exception:
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pass
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return app
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app = create_app()
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