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180 | def create_app(settings: Optional[Settings] = None) -> FastAPI:
"""FastAPI Application Factory."""
settings = settings or Settings()
#
# Application
#
@asynccontextmanager
async def lifespan(app: FastAPI):
assert settings
# Wait for upstream servers to become available
if settings.wait_for_upstream:
logger.info("Running upstream server health checks...")
urls = [settings.upstream_url, settings.oidc_discovery_internal_url]
for url in urls:
await check_server_health(url=url)
logger.info(
"Upstream servers are healthy:\n%s",
"\n".join([f" - {url}" for url in urls]),
)
# Log all middleware connected to the app
logger.info(
"Connected middleware:\n%s",
"\n".join([f" - {m.cls.__name__}" for m in app.user_middleware]),
)
if settings.check_conformance:
await check_conformance(
app.user_middleware,
str(settings.upstream_url),
)
yield
app = FastAPI(
openapi_url=None, # Disable OpenAPI schema endpoint, we want to serve upstream's schema
lifespan=lifespan,
root_path=settings.root_path,
)
if app.root_path:
logger.debug("Mounted app at %s", app.root_path)
#
# Handlers (place catch-all proxy handler last)
#
if settings.swagger_ui_endpoint:
assert (
settings.openapi_spec_endpoint
), "openapi_spec_endpoint must be set when using swagger_ui_endpoint"
app.add_route(
settings.swagger_ui_endpoint,
SwaggerUI(
openapi_url=settings.openapi_spec_endpoint,
init_oauth=settings.swagger_ui_init_oauth,
).route,
include_in_schema=False,
)
if settings.healthz_prefix:
app.include_router(
HealthzHandler(upstream_url=str(settings.upstream_url)).router,
prefix=settings.healthz_prefix,
)
app.add_api_route(
"/{path:path}",
ReverseProxyHandler(
upstream=str(settings.upstream_url),
override_host=settings.override_host,
).proxy_request,
methods=["GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"],
)
#
# Middleware (order is important, last added = first to run)
#
if settings.enable_authentication_extension:
app.add_middleware(
AuthenticationExtensionMiddleware,
default_public=settings.default_public,
public_endpoints=settings.public_endpoints,
private_endpoints=settings.private_endpoints,
oidc_discovery_url=str(settings.oidc_discovery_url),
)
if settings.openapi_spec_endpoint:
app.add_middleware(
OpenApiMiddleware,
openapi_spec_path=settings.openapi_spec_endpoint,
oidc_discovery_url=str(settings.oidc_discovery_url),
public_endpoints=settings.public_endpoints,
private_endpoints=settings.private_endpoints,
default_public=settings.default_public,
root_path=settings.root_path,
auth_scheme_name=settings.openapi_auth_scheme_name,
auth_scheme_override=settings.openapi_auth_scheme_override,
)
if settings.items_filter or settings.collections_filter:
app.add_middleware(Cql2ValidateResponseBodyMiddleware)
app.add_middleware(Cql2ApplyFilterBodyMiddleware)
app.add_middleware(Cql2ApplyFilterQueryStringMiddleware)
app.add_middleware(
Cql2BuildFilterMiddleware,
items_filter=settings.items_filter() if settings.items_filter else None,
collections_filter=(
settings.collections_filter() if settings.collections_filter else None
),
collections_filter_path=settings.collections_filter_path,
items_filter_path=settings.items_filter_path,
)
app.add_middleware(
AddProcessTimeHeaderMiddleware,
)
app.add_middleware(
EnforceAuthMiddleware,
public_endpoints=settings.public_endpoints,
private_endpoints=settings.private_endpoints,
default_public=settings.default_public,
oidc_discovery_url=settings.oidc_discovery_internal_url,
)
if settings.root_path or settings.upstream_url.path != "/":
app.add_middleware(
ProcessLinksMiddleware,
upstream_url=str(settings.upstream_url),
root_path=settings.root_path,
)
if settings.root_path:
app.add_middleware(
RemoveRootPathMiddleware,
root_path=settings.root_path,
)
if settings.enable_compression:
app.add_middleware(
CompressionMiddleware,
)
return app
|