gradio/routes.py

"""Implements a FastAPI server to run the gradio interface. Note that some types in this
module use the Optional/Union notation so that they work correctly with pydantic."""

from __future__ import annotations

import asyncio
import contextlib
import hashlib
import importlib.resources
import inspect
import json
import math
import mimetypes
import os
import secrets
import sys
import time
import traceback
import warnings
from collections.abc import AsyncIterator, Callable
from pathlib import Path
from queue import Empty as EmptyQueue
from typing import (
    TYPE_CHECKING,
    Any,
    Literal,
    Optional,
    Union,
    cast,
)

import fastapi
import httpx
import markupsafe
import orjson
from fastapi import (
    APIRouter,
    BackgroundTasks,
    Depends,
    FastAPI,
    HTTPException,
    status,
)
from fastapi.responses import (
    FileResponse,
    HTMLResponse,
    JSONResponse,
    PlainTextResponse,
    Response,
    StreamingResponse,
)
from fastapi.security import OAuth2PasswordRequestForm
from fastapi.templating import Jinja2Templates
from fastapi.websockets import WebSocket, WebSocketDisconnect
from gradio_client import utils as client_utils
from gradio_client.documentation import document
from gradio_client.utils import ServerMessage
from jinja2.exceptions import TemplateNotFound
from multipart.multipart import parse_options_header
from starlette.background import BackgroundTask
from starlette.datastructures import UploadFile as StarletteUploadFile
from starlette.responses import RedirectResponse

import gradio
from gradio import ranged_response, route_utils, utils, wasm_utils
from gradio.context import Context
from gradio.data_classes import (
    CancelBody,
    ComponentServerBlobBody,
    ComponentServerJSONBody,
    DataWithFiles,
    DeveloperPath,
    PredictBody,
    PredictBodyInternal,
    ResetBody,
    SimplePredictBody,
    UserProvidedPath,
)
from gradio.exceptions import InvalidPathError
from gradio.node_server import (
    start_node_server,
)
from gradio.oauth import attach_oauth
from gradio.route_utils import (  # noqa: F401
    API_PREFIX,
    CustomCORSMiddleware,
    FileUploadProgress,
    FileUploadProgressNotQueuedError,
    FileUploadProgressNotTrackedError,
    GradioMultiPartParser,
    GradioUploadFile,
    MultiPartException,
    Request,
    compare_passwords_securely,
    create_lifespan_handler,
    move_uploaded_files_to_cache,
)
from gradio.server_messages import (
    CloseStreamMessage,
    EstimationMessage,
    EventMessage,
    HeartbeatMessage,
    ProcessCompletedMessage,
    ProcessGeneratingMessage,
    UnexpectedErrorMessage,
)
from gradio.state_holder import StateHolder
from gradio.utils import (
    cancel_tasks,
    get_node_path,
    get_package_version,
    get_upload_folder,
)

if TYPE_CHECKING:
    from gradio.blocks import Block


mimetypes.init()

STATIC_TEMPLATE_LIB = cast(
    DeveloperPath,
    importlib.resources.files("gradio").joinpath("templates").as_posix(),  # type: ignore
)
STATIC_PATH_LIB = cast(
    DeveloperPath,
    importlib.resources.files("gradio")
    .joinpath("templates/frontend/static")
    .as_posix(),  # type: ignore
)
BUILD_PATH_LIB = cast(
    DeveloperPath,
    importlib.resources.files("gradio")
    .joinpath("templates/frontend/assets")
    .as_posix(),  # type: ignore
)
VERSION = get_package_version()
XSS_SAFE_MIMETYPES = {
    "image/jpeg",
    "image/png",
    "image/gif",
    "image/webp",
    "audio/mpeg",
    "audio/wav",
    "audio/ogg",
    "video/mp4",
    "video/webm",
    "video/ogg",
    "text/plain",
    "application/json",
}


class ORJSONResponse(JSONResponse):
    media_type = "application/json"

    @staticmethod
    def _render(content: Any) -> bytes:
        return orjson.dumps(
            content,
            option=orjson.OPT_SERIALIZE_NUMPY | orjson.OPT_PASSTHROUGH_DATETIME,
            default=str,
        )

    def render(self, content: Any) -> bytes:
        return ORJSONResponse._render(content)

    @staticmethod
    def _render_str(content: Any) -> str:
        return ORJSONResponse._render(content).decode("utf-8")


def toorjson(value):
    return markupsafe.Markup(
        ORJSONResponse._render_str(value)
        .replace("<", "\\u003c")
        .replace(">", "\\u003e")
        .replace("&", "\\u0026")
        .replace("'", "\\u0027")
    )


templates = Jinja2Templates(directory=STATIC_TEMPLATE_LIB)
templates.env.filters["toorjson"] = toorjson

client = httpx.AsyncClient(
    limits=httpx.Limits(
        max_connections=100,
        max_keepalive_connections=20,
    ),
    timeout=httpx.Timeout(10.0),
)

file_upload_statuses = FileUploadProgress()


class App(FastAPI):
    """
    FastAPI App Wrapper
    """

    app_port = None

    def __init__(
        self,
        auth_dependency: Callable[[fastapi.Request], str | None] | None = None,
        **kwargs,
    ):
        self.tokens = {}
        self.auth = None
        self.analytics_key = secrets.token_urlsafe(16)
        self.monitoring_enabled = False
        self.blocks: gradio.Blocks | None = None
        self.state_holder = StateHolder()
        self.iterators: dict[str, AsyncIterator] = {}
        self.iterators_to_reset: set[str] = set()
        self.lock = utils.safe_get_lock()
        self.stop_event = utils.safe_get_stop_event()
        self.cookie_id = secrets.token_urlsafe(32)
        self.queue_token = secrets.token_urlsafe(32)
        self.startup_events_triggered = False
        self.uploaded_file_dir = get_upload_folder()
        self.change_count: int = 0
        self.change_type: Literal["reload", "error"] | None = None
        self.reload_error_message: str | None = None
        self._asyncio_tasks: list[asyncio.Task] = []
        self.auth_dependency = auth_dependency
        self.api_info = None
        self.all_app_info = None

        # Allow user to manually set `docs_url` and `redoc_url`
        # when instantiating an App; when they're not set, disable docs and redoc.
        kwargs.setdefault("docs_url", None)
        kwargs.setdefault("redoc_url", None)
        self.custom_component_hashes: dict[str, str] = {}
        super().__init__(**kwargs)

    # Create a single client to be reused across requests
    # We're not overriding any defaults here

    client = httpx.AsyncClient()

    @staticmethod
    async def proxy_to_node(
        request: fastapi.Request,
        server_name: str,
        node_port: int,
        python_port: int,
        scheme: str = "http",
        mounted_path: str = "",
    ) -> Response:
        full_path = request.url.path
        if mounted_path:
            full_path = full_path.replace(mounted_path, "")
        if request.url.query:
            full_path += f"?{request.url.query}"

        url = f"{scheme}://{server_name}:{node_port}{full_path}"

        server_url = f"{scheme}://{server_name}"
        if python_port:
            server_url += f":{python_port}"
        if mounted_path:
            server_url += mounted_path

        headers = dict(request.headers)
        headers["x-gradio-server"] = server_url
        headers["x-gradio-port"] = str(python_port)

        if os.getenv("GRADIO_LOCAL_DEV_MODE"):
            headers["x-gradio-local-dev-mode"] = "1"

        new_request = App.client.build_request(
            request.method, httpx.URL(url), headers=headers
        )
        node_response = await App.client.send(new_request)

        return Response(
            content=node_response.content,
            status_code=node_response.status_code,
            headers=dict(node_response.headers),
        )

    def configure_app(self, blocks: gradio.Blocks) -> None:
        auth = blocks.auth
        if auth is not None:
            if not callable(auth):
                self.auth = {account[0]: account[1] for account in auth}
            else:
                self.auth = auth
        else:
            self.auth = None

        self.blocks = blocks
        self.cwd = os.getcwd()
        self.favicon_path = blocks.favicon_path
        self.tokens = {}
        self.root_path = blocks.root_path
        self.state_holder.set_blocks(blocks)

    def get_blocks(self) -> gradio.Blocks:
        if self.blocks is None:
            raise ValueError("No Blocks has been configured for this app.")
        return self.blocks

    def build_proxy_request(self, url_path):
        url = httpx.URL(url_path)
        assert self.blocks  # noqa: S101
        # Don't proxy a URL unless it's a URL specifically loaded by the user using
        # gr.load() to prevent SSRF or harvesting of HF tokens by malicious Spaces.
        is_safe_url = any(
            url.host == httpx.URL(root).host for root in self.blocks.proxy_urls
        )
        if not is_safe_url:
            raise PermissionError("This URL cannot be proxied.")
        is_hf_url = url.host.endswith(".hf.space")
        headers = {}
        if Context.hf_token is not None and is_hf_url:
            headers["Authorization"] = f"Bearer {Context.hf_token}"
        rp_req = client.build_request("GET", url, headers=headers)
        return rp_req

    def _cancel_asyncio_tasks(self):
        for task in self._asyncio_tasks:
            task.cancel()
        self._asyncio_tasks = []

    @staticmethod
    def create_app(
        blocks: gradio.Blocks,
        app_kwargs: dict[str, Any] | None = None,
        auth_dependency: Callable[[fastapi.Request], str | None] | None = None,
        strict_cors: bool = True,
        ssr_mode: bool = False,
    ) -> App:
        app_kwargs = app_kwargs or {}
        app_kwargs.setdefault("default_response_class", ORJSONResponse)
        delete_cache = blocks.delete_cache or (None, None)
        app_kwargs["lifespan"] = create_lifespan_handler(
            app_kwargs.get("lifespan", None), *delete_cache
        )
        app = App(auth_dependency=auth_dependency, **app_kwargs, debug=True)
        router = APIRouter(prefix=API_PREFIX)

        app.configure_app(blocks)

        if not wasm_utils.IS_WASM:
            app.add_middleware(CustomCORSMiddleware, strict_cors=strict_cors)

        if ssr_mode:

            @app.middleware("http")
            async def conditional_routing_middleware(
                request: fastapi.Request, call_next
            ):
                custom_mount_path = blocks.custom_mount_path
                path = (
                    request.url.path.replace(blocks.custom_mount_path or "", "")
                    if custom_mount_path is not None
                    else request.url.path
                )

                if (
                    getattr(blocks, "node_process", None) is not None
                    and blocks.node_port is not None
                    and not path.startswith("/gradio_api")
                    and path not in ["/config", "/login", "/favicon.ico"]
                    and not path.startswith("/theme")
                    and not path.startswith("/svelte")
                    and not path.startswith("/static")
                ):
                    if App.app_port is None:
                        App.app_port = request.url.port or int(
                            os.getenv("GRADIO_SERVER_PORT", "7860")
                        )

                    try:
                        return await App.proxy_to_node(
                            request,
                            blocks.node_server_name or "0.0.0.0",
                            blocks.node_port,
                            App.app_port,
                            request.url.scheme,
                            custom_mount_path or "",
                        )
                    except Exception as e:
                        print(e)
                response = await call_next(request)
                return response

        @router.get("/user")
        @router.get("/user/")
        def get_current_user(request: fastapi.Request) -> Optional[str]:
            if app.auth_dependency is not None:
                return app.auth_dependency(request)
            token = request.cookies.get(
                f"access-token-{app.cookie_id}"
            ) or request.cookies.get(f"access-token-unsecure-{app.cookie_id}")
            return app.tokens.get(token)

        @router.get("/login_check")
        @router.get("/login_check/")
        def login_check(user: str = Depends(get_current_user)):
            if (app.auth is None and app.auth_dependency is None) or user is not None:
                return
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED, detail="Not authenticated"
            )

        @router.get("/token")
        @router.get("/token/")
        def get_token(request: fastapi.Request) -> dict:
            token = request.cookies.get(f"access-token-{app.cookie_id}")
            return {"token": token, "user": app.tokens.get(token)}

        @router.get("/app_id")
        @router.get("/app_id/")
        def app_id(request: fastapi.Request) -> dict:  # noqa: ARG001
            return {"app_id": app.get_blocks().app_id}

        @router.get("/dev/reload", dependencies=[Depends(login_check)])
        async def notify_changes(
            request: fastapi.Request,
        ):
            async def reload_checker(request: fastapi.Request):
                heartbeat_rate = 15
                check_rate = 0.05
                last_heartbeat = time.perf_counter()
                current_count = app.change_count

                while True:
                    if await request.is_disconnected():
                        return

                    if app.change_count != current_count:
                        current_count = app.change_count
                        msg = (
                            json.dumps(f"{app.reload_error_message}")
                            if app.change_type == "error"
                            else "{}"
                        )
                        yield f"""event: {app.change_type}\ndata: {msg}\n\n"""

                    await asyncio.sleep(check_rate)
                    if time.perf_counter() - last_heartbeat > heartbeat_rate:
                        yield """event: heartbeat\ndata: {}\n\n"""
                        last_heartbeat = time.time()

            return StreamingResponse(
                reload_checker(request),
                media_type="text/event-stream",
            )

        @app.post("/login")
        @app.post("/login/")
        def login(form_data: OAuth2PasswordRequestForm = Depends()):
            username, password = form_data.username.strip(), form_data.password
            if app.auth is None:
                return RedirectResponse(url="/", status_code=status.HTTP_302_FOUND)
            if (
                not callable(app.auth)
                and username in app.auth
                and compare_passwords_securely(password, app.auth[username])  # type: ignore
            ) or (callable(app.auth) and app.auth.__call__(username, password)):  # type: ignore
                token = secrets.token_urlsafe(16)
                app.tokens[token] = username
                response = JSONResponse(content={"success": True})
                response.set_cookie(
                    key=f"access-token-{app.cookie_id}",
                    value=token,
                    httponly=True,
                    samesite="none",
                    secure=True,
                )
                response.set_cookie(
                    key=f"access-token-unsecure-{app.cookie_id}",
                    value=token,
                    httponly=True,
                )
                return response
            else:
                raise HTTPException(status_code=400, detail="Incorrect credentials.")

        ###############
        # OAuth Routes
        ###############

        # Define OAuth routes if the app expects it (i.e. a LoginButton is defined).
        # It allows users to "Sign in with HuggingFace". Otherwise, add the default
        # logout route.
        if app.blocks is not None and app.blocks.expects_oauth:
            attach_oauth(app)
        else:

            @app.get("/logout")
            def logout(user: str = Depends(get_current_user)):
                response = RedirectResponse(url="/", status_code=status.HTTP_302_FOUND)
                response.delete_cookie(key=f"access-token-{app.cookie_id}", path="/")
                response.delete_cookie(
                    key=f"access-token-unsecure-{app.cookie_id}", path="/"
                )
                # A user may have multiple tokens, so we need to delete all of them.
                for token in list(app.tokens.keys()):
                    if app.tokens[token] == user:
                        del app.tokens[token]
                return response

        ###############
        # Main Routes
        ###############

        @app.get("/svelte/{path:path}")
        def _(path: str):
            svelte_path = Path(BUILD_PATH_LIB) / "svelte"
            return FileResponse(
                routes_safe_join(
                    DeveloperPath(str(svelte_path)), UserProvidedPath(path)
                )
            )

        @app.head("/", response_class=HTMLResponse)
        @app.get("/", response_class=HTMLResponse)
        def main(request: fastapi.Request, user: str = Depends(get_current_user)):
            mimetypes.add_type("application/javascript", ".js")
            blocks = app.get_blocks()
            root = route_utils.get_root_url(
                request=request, route_path="/", root_path=app.root_path
            )
            if (app.auth is None and app.auth_dependency is None) or user is not None:
                config = utils.safe_deepcopy(blocks.config)
                config = route_utils.update_root_in_config(config, root)
                config["username"] = user
            elif app.auth_dependency:
                raise HTTPException(
                    status_code=status.HTTP_401_UNAUTHORIZED, detail="Not authenticated"
                )
            else:
                config = {
                    "auth_required": True,
                    "auth_message": blocks.auth_message,
                    "space_id": blocks.space_id,
                    "root": root,
                }

            try:
                template = (
                    "frontend/share.html" if blocks.share else "frontend/index.html"
                )
                gradio_api_info = api_info(request)
                return templates.TemplateResponse(
                    template,
                    {
                        "request": request,
                        "config": config,
                        "gradio_api_info": gradio_api_info,
                    },
                )
            except TemplateNotFound as err:
                if blocks.share:
                    raise ValueError(
                        "Did you install Gradio from source files? Share mode only "
                        "works when Gradio is installed through the pip package."
                    ) from err
                else:
                    raise ValueError(
                        "Did you install Gradio from source files? You need to build "
                        "the frontend by running /scripts/build_frontend.sh"
                    ) from err

        @router.get("/info/", dependencies=[Depends(login_check)])
        @router.get("/info", dependencies=[Depends(login_check)])
        def api_info(request: fastapi.Request):
            all_endpoints = request.query_params.get("all_endpoints", False)
            if all_endpoints:
                if not app.all_app_info:
                    app.all_app_info = app.get_blocks().get_api_info(all_endpoints=True)
                return app.all_app_info
            if not app.api_info:
                api_info = cast(dict[str, Any], app.get_blocks().get_api_info())
                api_info = route_utils.update_example_values_to_use_public_url(api_info)
                app.api_info = api_info
            return app.api_info

        @app.get("/config/", dependencies=[Depends(login_check)])
        @app.get("/config", dependencies=[Depends(login_check)])
        def get_config(request: fastapi.Request):
            config = utils.safe_deepcopy(app.get_blocks().config)
            root = route_utils.get_root_url(
                request=request, route_path="/config", root_path=app.root_path
            )
            config = route_utils.update_root_in_config(config, root)
            config["username"] = get_current_user(request)
            return ORJSONResponse(content=config)

        @app.get("/static/{path:path}")
        def static_resource(path: str):
            static_file = routes_safe_join(STATIC_PATH_LIB, UserProvidedPath(path))
            return FileResponse(static_file)

        @router.get("/custom_component/{id}/{environment}/{type}/{file_name}")
        def custom_component_path(
            id: str,
            environment: Literal["client", "server"],
            type: str,
            file_name: str,
            req: fastapi.Request,
        ):
            if environment not in ["client", "server"]:
                raise HTTPException(
                    status_code=404, detail="Environment not supported."
                )
            config = app.get_blocks().config
            components = config["components"]
            location = next(
                (item for item in components if item["component_class_id"] == id), None
            )
            if location is None:
                raise HTTPException(status_code=404, detail="Component not found.")

            component_instance = app.get_blocks().get_component(location["id"])

            module_name = component_instance.__class__.__module__
            module_path = sys.modules[module_name].__file__

            if module_path is None or component_instance is None:
                raise HTTPException(status_code=404, detail="Component not found.")

            try:
                requested_path = utils.safe_join(
                    component_instance.__class__.TEMPLATE_DIR,
                    UserProvidedPath(f"{type}/{file_name}"),
                )
            except InvalidPathError:
                raise HTTPException(
                    status_code=404, detail="Component not found."
                ) from None

            path = routes_safe_join(
                DeveloperPath(str(Path(module_path).parent)),
                UserProvidedPath(requested_path),
            )

            # Uncomment when we support custom component SSR
            # if environment == "server":
            #     return PlainTextResponse(path)

            key = f"{id}-{type}-{file_name}"

            if key not in app.custom_component_hashes:
                app.custom_component_hashes[key] = hashlib.md5(
                    Path(path).read_text(encoding="utf-8").encode()
                ).hexdigest()

            version = app.custom_component_hashes.get(key)
            headers = {"Cache-Control": "max-age=0, must-revalidate"}
            if version:
                headers["ETag"] = version

            if version and req.headers.get("if-none-match") == version:
                return PlainTextResponse(status_code=304, headers=headers)

            return FileResponse(path, headers=headers)

        @app.get("/assets/{path:path}")
        def build_resource(path: str):
            build_file = routes_safe_join(BUILD_PATH_LIB, UserProvidedPath(path))
            return FileResponse(build_file)

        @app.get("/favicon.ico")
        async def favicon():
            blocks = app.get_blocks()
            if blocks.favicon_path is None:
                return static_resource("img/logo.svg")
            else:
                return FileResponse(blocks.favicon_path)

        @router.head("/proxy={url_path:path}", dependencies=[Depends(login_check)])
        @router.get("/proxy={url_path:path}", dependencies=[Depends(login_check)])
        async def reverse_proxy(url_path: str):
            # Adapted from: https://github.com/tiangolo/fastapi/issues/1788
            try:
                rp_req = app.build_proxy_request(url_path)
            except PermissionError as err:
                raise HTTPException(status_code=400, detail=str(err)) from err
            rp_resp = await client.send(rp_req, stream=True)
            mime_type, _ = mimetypes.guess_type(url_path)
            if mime_type not in XSS_SAFE_MIMETYPES:
                rp_resp.headers.update({"Content-Disposition": "attachment"})
                rp_resp.headers.update({"Content-Type": "application/octet-stream"})
            return StreamingResponse(
                rp_resp.aiter_raw(),
                status_code=rp_resp.status_code,
                headers=rp_resp.headers,  # type: ignore
                background=BackgroundTask(rp_resp.aclose),
            )

        @router.head("/file={path_or_url:path}", dependencies=[Depends(login_check)])
        @router.get("/file={path_or_url:path}", dependencies=[Depends(login_check)])
        async def file(path_or_url: str, request: fastapi.Request):
            blocks = app.get_blocks()
            if client_utils.is_http_url_like(path_or_url):
                return RedirectResponse(
                    url=path_or_url, status_code=status.HTTP_302_FOUND
                )

            if route_utils.starts_with_protocol(path_or_url):
                raise HTTPException(403, f"File not allowed: {path_or_url}.")

            abs_path = utils.abspath(path_or_url)
            if abs_path.is_dir() or not abs_path.exists():
                raise HTTPException(403, f"File not allowed: {path_or_url}.")

            from gradio.data_classes import _StaticFiles

            allowed, reason = utils.is_allowed_file(
                abs_path,
                blocked_paths=blocks.blocked_paths,
                allowed_paths=blocks.allowed_paths + _StaticFiles.all_paths,
                created_paths=[app.uploaded_file_dir, utils.get_cache_folder()],
            )
            if not allowed:
                raise HTTPException(403, f"File not allowed: {path_or_url}.")

            mime_type, _ = mimetypes.guess_type(abs_path)
            if mime_type in XSS_SAFE_MIMETYPES or reason == "allowed":
                media_type = mime_type or "application/octet-stream"
                content_disposition_type = "inline"
            else:
                media_type = "application/octet-stream"
                content_disposition_type = "attachment"

            range_val = request.headers.get("Range", "").strip()
            if range_val.startswith("bytes=") and "-" in range_val:
                range_val = range_val[6:]
                start, end = range_val.split("-")
                if start.isnumeric() and end.isnumeric():
                    start = int(start)
                    end = int(end)
                    headers = dict(request.headers)
                    headers["Content-Disposition"] = content_disposition_type
                    headers["Content-Type"] = media_type
                    response = ranged_response.RangedFileResponse(
                        abs_path,
                        ranged_response.OpenRange(start, end),
                        headers,
                        stat_result=os.stat(abs_path),
                    )
                    return response

            return FileResponse(
                abs_path,
                headers={"Accept-Ranges": "bytes"},
                content_disposition_type=content_disposition_type,
                media_type=media_type,
                filename=abs_path.name,
            )

        @router.post("/stream/{event_id}")
        async def _(event_id: str, body: PredictBody, request: fastapi.Request):
            event = app.get_blocks()._queue.event_ids_to_events[event_id]
            body = PredictBodyInternal(**body.model_dump(), request=request)
            event.data = body
            event.signal.set()
            return {"msg": "success"}

        @router.websocket("/stream/{event_id}")
        async def websocket_endpoint(websocket: WebSocket, event_id: str):
            await websocket.accept()
            try:
                while True:
                    data = await websocket.receive_json()
                    body = PredictBody(**data)
                    event = app.get_blocks()._queue.event_ids_to_events[event_id]
                    body_internal = PredictBodyInternal(
                        **body.model_dump(), request=None
                    )
                    event.data = body_internal
                    event.signal.set()
                    await websocket.send_json({"msg": "success"})
            except WebSocketDisconnect:
                pass

        @router.post("/stream/{event_id}/close")
        async def _(event_id: str):
            event = app.get_blocks()._queue.event_ids_to_events[event_id]
            event.run_time = math.inf
            event.signal.set()
            return {"msg": "success"}

        @router.get("/stream/{session_hash}/{run}/{component_id}/playlist.m3u8")
        async def _(session_hash: str, run: int, component_id: int):
            stream: route_utils.MediaStream | None = (
                app.get_blocks()
                .pending_streams[session_hash]
                .get(run, {})
                .get(component_id, None)
            )

            if not stream:
                return Response(status_code=404)

            playlist = f"#EXTM3U\n#EXT-X-PLAYLIST-TYPE:EVENT\n#EXT-X-TARGETDURATION:{stream.max_duration}\n#EXT-X-VERSION:4\n#EXT-X-MEDIA-SEQUENCE:0\n"

            for segment in stream.segments:
                playlist += f"#EXTINF:{segment['duration']:.3f},\n"
                playlist += f"{segment['id']}{segment['extension']}\n"  # type: ignore

            if stream.ended:
                playlist += "#EXT-X-ENDLIST\n"

            return Response(
                content=playlist, media_type="application/vnd.apple.mpegurl"
            )

        @router.get("/stream/{session_hash}/{run}/{component_id}/{segment_id}.{ext}")
        async def _(
            session_hash: str, run: int, component_id: int, segment_id: str, ext: str
        ):
            if ext not in ["aac", "ts"]:
                return Response(status_code=400, content="Unsupported file extension")
            stream: route_utils.MediaStream | None = (
                app.get_blocks()
                .pending_streams[session_hash]
                .get(run, {})
                .get(component_id, None)
            )

            if not stream:
                return Response(status_code=404, content="Stream not found")

            segment = next((s for s in stream.segments if s["id"] == segment_id), None)  # type: ignore

            if segment is None:
                return Response(status_code=404, content="Segment not found")

            if ext == "aac":
                return Response(content=segment["data"], media_type="audio/aac")
            else:
                return Response(content=segment["data"], media_type="video/MP2T")

        @router.get("/stream/{session_hash}/{run}/{component_id}/playlist-file")
        async def _(session_hash: str, run: int, component_id: int):
            stream: route_utils.MediaStream | None = (
                app.get_blocks()
                .pending_streams[session_hash]
                .get(run, {})
                .get(component_id, None)
            )

            if not stream:
                return Response(status_code=404)

            if not stream.combined_file:
                stream_data = [s["data"] for s in stream.segments]
                combined_file = (
                    await app.get_blocks()
                    .get_component(component_id)
                    .combine_stream(  # type: ignore
                        stream_data,
                        only_file=True,
                        desired_output_format=stream.desired_output_format,
                    )
                )
                stream.combined_file = combined_file.path
            return FileResponse(stream.combined_file)

        @router.get("/file/{path:path}", dependencies=[Depends(login_check)])
        async def file_deprecated(path: str, request: fastapi.Request):
            return await file(path, request)

        @router.post("/reset/")
        @router.post("/reset")
        async def reset_iterator(body: ResetBody):  # noqa: ARG001
            # No-op, all the cancelling/reset logic handled by /cancel
            return {"success": True}

        @router.get("/heartbeat/{session_hash}")
        def heartbeat(
            session_hash: str,
            request: fastapi.Request,
            background_tasks: BackgroundTasks,
            username: str = Depends(get_current_user),
        ):
            """Clients make a persistent connection to this endpoint to keep the session alive.
            When the client disconnects, the session state is deleted.
            """
            heartbeat_rate = 0.25 if os.getenv("GRADIO_IS_E2E_TEST", None) else 15

            async def wait():
                await asyncio.sleep(heartbeat_rate)
                return "wait"

            async def stop_stream():
                await app.stop_event.wait()
                return "stop"

            async def iterator():
                while True:
                    try:
                        yield "data: ALIVE\n\n"
                        # We need to close the heartbeat connections as soon as the server stops
                        # otherwise the server can take forever to close
                        wait_task = asyncio.create_task(wait())
                        stop_stream_task = asyncio.create_task(stop_stream())
                        done, _ = await asyncio.wait(
                            [wait_task, stop_stream_task],
                            return_when=asyncio.FIRST_COMPLETED,
                        )
                        done = [d.result() for d in done]
                        if "stop" in done:
                            raise asyncio.CancelledError()
                    except asyncio.CancelledError:
                        req = Request(request, username, session_hash=session_hash)
                        root_path = route_utils.get_root_url(
                            request=request,
                            route_path=f"{API_PREFIX}/hearbeat/{session_hash}",
                            root_path=app.root_path,
                        )
                        body = PredictBodyInternal(
                            session_hash=session_hash, data=[], request=request
                        )
                        unload_fn_indices = [
                            i
                            for i, dep in app.get_blocks().fns.items()
                            if any(t for t in dep.targets if t[1] == "unload")
                        ]
                        for fn_index in unload_fn_indices:
                            # The task runnning this loop has been cancelled
                            # so we add tasks in the background
                            background_tasks.add_task(
                                route_utils.call_process_api,
                                app=app,
                                body=body,
                                gr_request=req,
                                fn=app.get_blocks().fns[fn_index],
                                root_path=root_path,
                            )
                        # This will mark the state to be deleted in an hour
                        if session_hash in app.state_holder.session_data:
                            app.state_holder.session_data[session_hash].is_closed = True
                        for (
                            event_id
                        ) in app.get_blocks()._queue.pending_event_ids_session.get(
                            session_hash, []
                        ):
                            event = app.get_blocks()._queue.event_ids_to_events[
                                event_id
                            ]
                            event.run_time = math.inf
                            event.signal.set()
                        return

            return StreamingResponse(iterator(), media_type="text/event-stream")

        # had to use '/run' endpoint for Colab compatibility, '/api' supported for backwards compatibility
        @router.post("/run/{api_name}", dependencies=[Depends(login_check)])
        @router.post("/run/{api_name}/", dependencies=[Depends(login_check)])
        @router.post("/api/{api_name}", dependencies=[Depends(login_check)])
        @router.post("/api/{api_name}/", dependencies=[Depends(login_check)])
        async def predict(
            api_name: str,
            body: PredictBody,
            request: fastapi.Request,
            username: str = Depends(get_current_user),
        ):
            body = PredictBodyInternal(**body.model_dump(), request=request)
            fn = route_utils.get_fn(
                blocks=app.get_blocks(), api_name=api_name, body=body
            )

            if not app.get_blocks().api_open and fn.queue:
                raise HTTPException(
                    detail="This API endpoint does not accept direct HTTP POST requests. Please join the queue to use this API.",
                    status_code=status.HTTP_404_NOT_FOUND,
                )
            gr_request = route_utils.compile_gr_request(
                body,
                fn=fn,
                username=username,
                request=request,
            )
            root_path = route_utils.get_root_url(
                request=request,
                route_path=f"{API_PREFIX}/api/{api_name}",
                root_path=app.root_path,
            )
            try:
                output = await route_utils.call_process_api(
                    app=app,
                    body=body,
                    gr_request=gr_request,
                    fn=fn,
                    root_path=root_path,
                )
            except BaseException as error:
                content = utils.error_payload(error, app.get_blocks().show_error)
                traceback.print_exc()
                return JSONResponse(
                    content=content,
                    status_code=500,
                )
            return output

        @router.post("/call/{api_name}", dependencies=[Depends(login_check)])
        @router.post("/call/{api_name}/", dependencies=[Depends(login_check)])
        async def simple_predict_post(
            api_name: str,
            body: SimplePredictBody,
            request: fastapi.Request,
            username: str = Depends(get_current_user),
        ):
            full_body = PredictBody(**body.model_dump(), simple_format=True)
            fn = route_utils.get_fn(
                blocks=app.get_blocks(), api_name=api_name, body=full_body
            )
            full_body.fn_index = fn._id
            return await queue_join_helper(full_body, request, username)

        @router.post("/queue/join", dependencies=[Depends(login_check)])
        async def queue_join(
            body: PredictBody,
            request: fastapi.Request,
            username: str = Depends(get_current_user),
        ):
            if body.session_hash is None:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail="Session hash not found.",
                )
            return await queue_join_helper(body, request, username)

        async def queue_join_helper(
            body: PredictBody,
            request: fastapi.Request,
            username: str,
        ):
            blocks = app.get_blocks()

            if blocks._queue.server_app is None:
                blocks._queue.set_server_app(app)

            if blocks._queue.stopped:
                raise HTTPException(
                    status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
                    detail="Queue is stopped.",
                )
            body = PredictBodyInternal(**body.model_dump(), request=request)
            success, event_id = await blocks._queue.push(
                body=body, request=request, username=username
            )
            if not success:
                status_code = (
                    status.HTTP_503_SERVICE_UNAVAILABLE
                    if "Queue is full." in event_id
                    else status.HTTP_400_BAD_REQUEST
                )
                raise HTTPException(status_code=status_code, detail=event_id)
            return {"event_id": event_id}

        @router.post("/cancel")
        async def cancel_event(body: CancelBody):
            await cancel_tasks({f"{body.session_hash}_{body.fn_index}"})
            blocks = app.get_blocks()
            # Need to complete the job so that the client disconnects
            session_open = (
                body.session_hash in blocks._queue.pending_messages_per_session
            )
            event_running = (
                body.event_id
                in blocks._queue.pending_event_ids_session.get(body.session_hash, {})
            )
            if session_open and event_running:
                message = ProcessCompletedMessage(
                    output={}, success=True, event_id=body.event_id
                )
                blocks._queue.pending_messages_per_session[
                    body.session_hash
                ].put_nowait(message)
            if body.event_id in app.iterators:
                async with app.lock:
                    del app.iterators[body.event_id]
                    app.iterators_to_reset.add(body.event_id)
            return {"success": True}

        @router.get("/call/{api_name}/{event_id}", dependencies=[Depends(login_check)])
        async def simple_predict_get(
            request: fastapi.Request,
            event_id: str,
        ):
            def process_msg(message: EventMessage) -> str | None:
                msg = message.model_dump()
                if isinstance(message, ProcessCompletedMessage):
                    event = "complete" if message.success else "error"
                    data = msg["output"].get("data")
                elif isinstance(message, ProcessGeneratingMessage):
                    event = "generating" if message.success else "error"
                    data = msg["output"].get("data")
                elif isinstance(message, HeartbeatMessage):
                    event = "heartbeat"
                    data = None
                elif isinstance(message, UnexpectedErrorMessage):
                    event = "error"
                    data = message.message
                else:
                    return None
                return f"event: {event}\ndata: {json.dumps(data)}\n\n"

            return await queue_data_helper(request, event_id, process_msg)

        @router.get("/queue/data", dependencies=[Depends(login_check)])
        async def queue_data(
            request: fastapi.Request,
            session_hash: str,
        ):
            def process_msg(message: EventMessage) -> str:
                return f"data: {orjson.dumps(message.model_dump(), default=str).decode('utf-8')}\n\n"

            return await queue_data_helper(request, session_hash, process_msg)

        async def queue_data_helper(
            request: fastapi.Request,
            session_hash: str,
            process_msg: Callable[[EventMessage], str | None],
        ):
            blocks = app.get_blocks()

            async def sse_stream(request: fastapi.Request):
                try:
                    last_heartbeat = time.perf_counter()
                    while True:
                        if await request.is_disconnected():
                            await blocks._queue.clean_events(session_hash=session_hash)
                            return

                        if (
                            session_hash
                            not in blocks._queue.pending_messages_per_session
                        ):
                            raise HTTPException(
                                status_code=status.HTTP_404_NOT_FOUND,
                                detail="Session not found.",
                            )

                        heartbeat_rate = 15
                        check_rate = 0.05
                        message = None
                        try:
                            messages = blocks._queue.pending_messages_per_session[
                                session_hash
                            ]
                            message = messages.get_nowait()
                        except EmptyQueue:
                            await asyncio.sleep(check_rate)
                            if time.perf_counter() - last_heartbeat > heartbeat_rate:
                                # Fix this
                                message = HeartbeatMessage()
                                # Need to reset last_heartbeat with perf_counter
                                # otherwise only a single hearbeat msg will be sent
                                # and then the stream will retry leading to infinite queue 😬
                                last_heartbeat = time.perf_counter()

                        if blocks._queue.stopped:
                            message = UnexpectedErrorMessage(
                                message="Server stopped unexpectedly.",
                                success=False,
                            )
                        if message:
                            response = process_msg(message)
                            if response is not None:
                                yield response
                            if (
                                isinstance(message, ProcessCompletedMessage)
                                and message.event_id
                            ):
                                blocks._queue.pending_event_ids_session[
                                    session_hash
                                ].remove(message.event_id)
                                if message.msg == ServerMessage.server_stopped or (
                                    message.msg == ServerMessage.process_completed
                                    and (
                                        len(
                                            blocks._queue.pending_event_ids_session[
                                                session_hash
                                            ]
                                        )
                                        == 0
                                    )
                                ):
                                    message = CloseStreamMessage()
                                    response = process_msg(message)
                                    if response is not None:
                                        yield response
                                    return
                except BaseException as e:
                    message = UnexpectedErrorMessage(
                        message=str(e),
                    )
                    response = process_msg(message)
                    if isinstance(e, asyncio.CancelledError):
                        del blocks._queue.pending_messages_per_session[session_hash]
                        await blocks._queue.clean_events(session_hash=session_hash)
                    if response is not None:
                        yield response
                    raise e

            return StreamingResponse(
                sse_stream(request),
                media_type="text/event-stream",
            )

        async def get_item_or_file(
            request: fastapi.Request,
        ) -> Union[ComponentServerJSONBody, ComponentServerBlobBody]:
            content_type = request.headers.get("Content-Type")

            if isinstance(content_type, str) and content_type.startswith(
                "multipart/form-data"
            ):
                files = []
                data = {}
                async with request.form() as form:
                    for key, value in form.items():
                        if (
                            isinstance(value, list)
                            and len(value) > 1
                            and isinstance(value[0], StarletteUploadFile)
                        ):
                            for i, v in enumerate(value):
                                if isinstance(v, StarletteUploadFile):
                                    filename = v.filename
                                    contents = await v.read()
                                    files.append((filename, contents))
                                else:
                                    data[f"{key}-{i}"] = v
                        elif isinstance(value, StarletteUploadFile):
                            filename = value.filename
                            contents = await value.read()
                            files.append((filename, contents))
                        else:
                            data[key] = value

                return ComponentServerBlobBody(
                    data=DataWithFiles(data=data, files=files),
                    component_id=data["component_id"],
                    session_hash=data["session_hash"],
                    fn_name=data["fn_name"],
                )
            else:
                try:
                    data = await request.json()
                    return ComponentServerJSONBody(
                        data=data["data"],
                        component_id=data["component_id"],
                        session_hash=data["session_hash"],
                        fn_name=data["fn_name"],
                    )

                except Exception:
                    raise HTTPException(
                        status_code=status.HTTP_400_BAD_REQUEST,
                        detail="Invalid JSON body.",
                    ) from None

        @router.post(
            "/component_server",
            dependencies=[Depends(login_check)],
        )
        @router.post(
            "/component_server/",
            dependencies=[Depends(login_check)],
        )
        async def component_server(
            request: fastapi.Request,
        ):
            body = await get_item_or_file(request)
            state = app.state_holder[body.session_hash]
            component_id = body.component_id
            block: Block
            if component_id in state:
                block = state[component_id]
            else:
                block = app.get_blocks().blocks[component_id]
            fn = getattr(block, body.fn_name, None)
            if fn is None or not getattr(fn, "_is_server_fn", False):
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail="Function not found.",
                )
            if inspect.iscoroutinefunction(fn):
                return await fn(body.data)
            else:
                return fn(body.data)

        @router.get(
            "/queue/status",
            dependencies=[Depends(login_check)],
            response_model=EstimationMessage,
        )
        async def get_queue_status():
            return app.get_blocks()._queue.get_status()

        @router.get("/upload_progress")
        def get_upload_progress(upload_id: str, request: fastapi.Request):
            async def sse_stream(request: fastapi.Request):
                last_heartbeat = time.perf_counter()
                is_done = False
                while True:
                    if await request.is_disconnected():
                        file_upload_statuses.stop_tracking(upload_id)
                        return
                    if is_done:
                        file_upload_statuses.stop_tracking(upload_id)
                        return

                    heartbeat_rate = 15
                    check_rate = 0.05
                    try:
                        if file_upload_statuses.is_done(upload_id):
                            message = {"msg": "done"}
                            is_done = True
                        else:
                            update = file_upload_statuses.pop(upload_id)
                            message = {
                                "msg": "update",
                                "orig_name": update.filename,
                                "chunk_size": update.chunk_size,
                            }
                        yield f"data: {json.dumps(message)}\n\n"
                    except FileUploadProgressNotTrackedError:
                        return
                    except FileUploadProgressNotQueuedError:
                        await asyncio.sleep(check_rate)
                        if time.perf_counter() - last_heartbeat > heartbeat_rate:
                            message = {"msg": "heartbeat"}
                            yield f"data: {json.dumps(message)}\n\n"
                            last_heartbeat = time.perf_counter()

            return StreamingResponse(
                sse_stream(request),
                media_type="text/event-stream",
            )

        @router.post("/upload", dependencies=[Depends(login_check)])
        async def upload_file(
            request: fastapi.Request,
            bg_tasks: BackgroundTasks,
            upload_id: Optional[str] = None,
        ):
            content_type_header = request.headers.get("Content-Type")
            content_type: bytes
            content_type, _ = parse_options_header(content_type_header or "")
            if content_type != b"multipart/form-data":
                raise HTTPException(status_code=400, detail="Invalid content type.")

            try:
                if upload_id:
                    file_upload_statuses.track(upload_id)
                max_file_size = app.get_blocks().max_file_size
                max_file_size = max_file_size if max_file_size is not None else math.inf
                multipart_parser = GradioMultiPartParser(
                    request.headers,
                    request.stream(),
                    max_files=1000,
                    max_fields=1000,
                    max_file_size=max_file_size,
                    upload_id=upload_id if upload_id else None,
                    upload_progress=file_upload_statuses if upload_id else None,
                )
                form = await multipart_parser.parse()
            except MultiPartException as exc:
                code = 413 if "maximum allowed size" in exc.message else 400
                return PlainTextResponse(exc.message, status_code=code)

            output_files = []
            files_to_copy = []
            locations: list[str] = []

            for temp_file in form.getlist("files"):
                if not isinstance(temp_file, GradioUploadFile):
                    raise TypeError("File is not an instance of GradioUploadFile")
                if temp_file.filename:
                    file_name = Path(temp_file.filename).name
                    name = client_utils.strip_invalid_filename_characters(file_name)
                else:
                    name = f"tmp{secrets.token_hex(5)}"
                directory = Path(app.uploaded_file_dir) / temp_file.sha.hexdigest()
                directory.mkdir(exist_ok=True, parents=True)
                try:
                    dest = utils.safe_join(
                        DeveloperPath(str(directory)), UserProvidedPath(name)
                    )
                except InvalidPathError as err:
                    raise HTTPException(
                        status_code=400, detail=f"Invalid file name: {name}"
                    ) from err
                temp_file.file.close()
                # we need to move the temp file to the cache directory
                # but that's possibly blocking and we're in an async function
                # so we try to rename (this is what shutil.move tries first)
                # which should be super fast.
                # if that fails, we move in the background.
                try:
                    os.rename(temp_file.file.name, dest)
                except OSError:
                    files_to_copy.append(temp_file.file.name)
                    locations.append(dest)
                output_files.append(dest)
                blocks.upload_file_set.add(dest)
            if files_to_copy:
                bg_tasks.add_task(
                    move_uploaded_files_to_cache, files_to_copy, locations
                )
            return output_files

        @router.get("/startup-events")
        async def startup_events():
            if not app.startup_events_triggered:
                app.get_blocks().run_startup_events()
                await app.get_blocks().run_extra_startup_events()
                app.startup_events_triggered = True
                return True
            return False

        @router.get("/theme.css", response_class=PlainTextResponse)
        @app.get("/theme.css", response_class=PlainTextResponse)
        def theme_css():
            return PlainTextResponse(app.get_blocks().theme_css, media_type="text/css")

        @app.get("/robots.txt", response_class=PlainTextResponse)
        def robots_txt():
            if app.get_blocks().share:
                return "User-agent: *\nDisallow: /"
            else:
                return "User-agent: *\nDisallow: "

        @router.get("/monitoring", dependencies=[Depends(login_check)])
        async def analytics_login(request: fastapi.Request):
            if not blocks.enable_monitoring:
                raise HTTPException(
                    status_code=403, detail="Monitoring is not enabled."
                )
            root_url = route_utils.get_root_url(
                request=request,
                route_path=f"{API_PREFIX}/monitoring",
                root_path=app.root_path,
            )
            monitoring_url = f"{root_url}/monitoring/{app.analytics_key}"
            print(f"* Monitoring URL: {monitoring_url} *")
            return HTMLResponse("See console for monitoring URL.")

        @router.get("/monitoring/{key}")
        async def analytics_dashboard(key: str):
            if not blocks.enable_monitoring:
                raise HTTPException(
                    status_code=403, detail="Monitoring is not enabled."
                )
            if compare_passwords_securely(key, app.analytics_key):
                analytics_url = f"/monitoring/{app.analytics_key}/dashboard"
                if not app.monitoring_enabled:
                    from gradio.monitoring_dashboard import data
                    from gradio.monitoring_dashboard import demo as dashboard

                    mount_gradio_app(app, dashboard, path=analytics_url)
                    dashboard._queue.start()
                    analytics = app.get_blocks()._queue.event_analytics
                    data["data"] = analytics
                    app.monitoring_enabled = True
                return RedirectResponse(
                    url=analytics_url, status_code=status.HTTP_302_FOUND
                )
            else:
                raise HTTPException(status_code=403, detail="Invalid key.")

        app.include_router(router)

        return app


########
# Helper functions
########


def routes_safe_join(directory: DeveloperPath, path: UserProvidedPath) -> str:
    """Safely join the user path to the directory while performing some additional http-related checks,
    e.g. ensuring that the full path exists on the local file system and is not a directory
    """
    if path == "":
        raise fastapi.HTTPException(400)
    if route_utils.starts_with_protocol(path):
        raise fastapi.HTTPException(403)
    try:
        fullpath = Path(utils.safe_join(directory, path))
    except InvalidPathError as e:
        raise fastapi.HTTPException(403) from e
    if fullpath.is_dir():
        raise fastapi.HTTPException(403)
    if not fullpath.exists():
        raise fastapi.HTTPException(404)
    return str(fullpath)


def get_types(cls_set: list[type]):
    docset = []
    types = []
    for cls in cls_set:
        doc = inspect.getdoc(cls) or ""
        doc_lines = doc.split("\n")
        for line in doc_lines:
            if "value (" in line:
                types.append(line.split("value (")[1].split(")")[0])
        docset.append(doc_lines[1].split(":")[-1])
    return docset, types


@document()
def mount_gradio_app(
    app: fastapi.FastAPI,
    blocks: gradio.Blocks,
    path: str,
    server_name: str = "0.0.0.0",
    server_port: int = 7860,
    app_kwargs: dict[str, Any] | None = None,
    *,
    auth: Callable | tuple[str, str] | list[tuple[str, str]] | None = None,
    auth_message: str | None = None,
    auth_dependency: Callable[[fastapi.Request], str | None] | None = None,
    root_path: str | None = None,
    allowed_paths: list[str] | None = None,
    blocked_paths: list[str] | None = None,
    favicon_path: str | None = None,
    show_error: bool = True,
    max_file_size: str | int | None = None,
    ssr_mode: bool | None = None,
    node_server_name: str | None = None,
    node_port: int | None = None,
) -> fastapi.FastAPI:
    """Mount a gradio.Blocks to an existing FastAPI application.

    Parameters:
        app: The parent FastAPI application.
        blocks: The blocks object we want to mount to the parent app.
        path: The path at which the gradio application will be mounted, e.g. "/gradio".
        server_name: The server name on which the Gradio app will be run.
        server_port: The port on which the Gradio app will be run.
        app_kwargs: Additional keyword arguments to pass to the underlying FastAPI app as a dictionary of parameter keys and argument values. For example, `{"docs_url": "/docs"}`
        auth: If provided, username and password (or list of username-password tuples) required to access the gradio app. Can also provide function that takes username and password and returns True if valid login.
        auth_message: If provided, HTML message provided on login page for this gradio app.
        auth_dependency: A function that takes a FastAPI request and returns a string user ID or None. If the function returns None for a specific request, that user is not authorized to access the gradio app (they will see a 401 Unauthorized response). To be used with external authentication systems like OAuth. Cannot be used with `auth`.
        root_path: The subpath corresponding to the public deployment of this FastAPI application. For example, if the application is served at "https://example.com/myapp", the `root_path` should be set to "/myapp". A full URL beginning with http:// or https:// can be provided, which will be used in its entirety. Normally, this does not need to provided (even if you are using a custom `path`). However, if you are serving the FastAPI app behind a proxy, the proxy may not provide the full path to the Gradio app in the request headers. In which case, you can provide the root path here.
        allowed_paths: List of complete filepaths or parent directories that this gradio app is allowed to serve. Must be absolute paths. Warning: if you provide directories, any files in these directories or their subdirectories are accessible to all users of your app.
        blocked_paths: List of complete filepaths or parent directories that this gradio app is not allowed to serve (i.e. users of your app are not allowed to access). Must be absolute paths. Warning: takes precedence over `allowed_paths` and all other directories exposed by Gradio by default.
        favicon_path: If a path to a file (.png, .gif, or .ico) is provided, it will be used as the favicon for this gradio app's page.
        show_error: If True, any errors in the gradio app will be displayed in an alert modal and printed in the browser console log. Otherwise, errors will only be visible in the terminal session running the Gradio app.
        max_file_size: The maximum file size in bytes that can be uploaded. Can be a string of the form "<value><unit>", where value is any positive integer and unit is one of "b", "kb", "mb", "gb", "tb". If None, no limit is set.
        ssr_mode: If True, the Gradio app will be rendered using server-side rendering mode, which is typically more performant and provides better SEO, but this requires Node 20+ to be installed on the system. If False, the app will be rendered using client-side rendering mode. If None, will use GRADIO_SSR_MODE environment variable or default to False.
        node_server_name: The name of the Node server to use for SSR. If None, will use GRADIO_NODE_SERVER_NAME environment variable or search for a node binary in the system.
        node_port: The port on which the Node server should run. If None, will use GRADIO_NODE_SERVER_PORT environment variable or find a free port.
    Example:
        from fastapi import FastAPI
        import gradio as gr
        app = FastAPI()
        @app.get("/")
        def read_main():
            return {"message": "This is your main app"}
        io = gr.Interface(lambda x: "Hello, " + x + "!", "textbox", "textbox")
        app = gr.mount_gradio_app(app, io, path="/gradio")
        # Then run `uvicorn run:app` from the terminal and navigate to http://localhost:8000/gradio.
    """
    if favicon_path is not None and path != "/":
        warnings.warn(
            "The 'favicon_path' parameter is set but will be ignored because 'path' is not '/'. "
            "Please add the favicon directly to your FastAPI app."
        )

    blocks.dev_mode = False
    blocks.max_file_size = utils._parse_file_size(max_file_size)
    blocks.config = blocks.get_config_file()
    blocks.validate_queue_settings()
    blocks.custom_mount_path = path
    blocks.server_port = server_port
    blocks.server_name = server_name

    if auth is not None and auth_dependency is not None:
        raise ValueError(
            "You cannot provide both `auth` and `auth_dependency` in mount_gradio_app(). Please choose one."
        )
    if (
        auth
        and not callable(auth)
        and not isinstance(auth[0], tuple)
        and not isinstance(auth[0], list)
    ):
        blocks.auth = [auth]
    else:
        blocks.auth = auth
    blocks.auth_message = auth_message
    blocks.favicon_path = favicon_path
    blocks.allowed_paths = allowed_paths or []
    blocks.blocked_paths = blocked_paths or []
    blocks.show_error = show_error

    if not isinstance(blocks.allowed_paths, list):
        raise ValueError("`allowed_paths` must be a list of directories.")
    if not isinstance(blocks.blocked_paths, list):
        raise ValueError("`blocked_paths` must be a list of directories.")

    if root_path is not None:
        blocks.root_path = root_path

    blocks.ssr_mode = (
        False
        if wasm_utils.IS_WASM
        else (
            ssr_mode
            if ssr_mode is not None
            else os.getenv("GRADIO_SSR_MODE", "False").lower() == "true"
        )
    )

    blocks.node_path = os.environ.get(
        "GRADIO_NODE_PATH", "" if wasm_utils.IS_WASM else get_node_path()
    )

    blocks.node_server_name = node_server_name
    blocks.node_port = node_port

    if blocks.ssr_mode:
        blocks.node_server_name, blocks.node_process, blocks.node_port = (
            start_node_server(
                server_name=blocks.node_server_name,
                server_port=blocks.node_port,
                node_path=blocks.node_path,
            )
        )

    gradio_app = App.create_app(
        blocks,
        app_kwargs=app_kwargs,
        auth_dependency=auth_dependency,
        ssr_mode=blocks.ssr_mode,
    )
    old_lifespan = app.router.lifespan_context

    @contextlib.asynccontextmanager
    async def new_lifespan(app: FastAPI):
        async with old_lifespan(
            app
        ):  # Insert the startup events inside the FastAPI context manager
            async with gradio_app.router.lifespan_context(gradio_app):
                gradio_app.get_blocks().run_startup_events()
                await gradio_app.get_blocks().run_extra_startup_events()
                yield

    app.router.lifespan_context = new_lifespan

    app.mount(path, gradio_app)
    return app