routing.py

import asyncio
import dataclasses
import email.message
import inspect
import json
from enum import Enum, IntEnum
from typing import (
    Any,
    Callable,
    Coroutine,
    Dict,
    List,
    Optional,
    Sequence,
    Set,
    Tuple,
    Type,
    Union,
)

from fastapi import params
from fastapi.datastructures import Default, DefaultPlaceholder
from fastapi.dependencies.models import Dependant
from fastapi.dependencies.utils import (
    get_body_field,
    get_dependant,
    get_parameterless_sub_dependant,
    solve_dependencies,
)
from fastapi.encoders import DictIntStrAny, SetIntStr, jsonable_encoder
from fastapi.exceptions import RequestValidationError, WebSocketRequestValidationError
from fastapi.openapi.constants import STATUS_CODES_WITH_NO_BODY
from fastapi.types import DecoratedCallable
from fastapi.utils import (
    create_cloned_field,
    create_response_field,
    generate_unique_id,
    get_value_or_default,
)
from pydantic import BaseModel
from pydantic.error_wrappers import ErrorWrapper, ValidationError
from pydantic.fields import ModelField, Undefined
from starlette import routing
from starlette.concurrency import run_in_threadpool
from starlette.exceptions import HTTPException
from starlette.requests import Request
from starlette.responses import JSONResponse, Response
from starlette.routing import BaseRoute, Match
from starlette.routing import Mount as Mount  # noqa
from starlette.routing import (
    compile_path,
    get_name,
    request_response,
    websocket_session,
)
from starlette.status import WS_1008_POLICY_VIOLATION
from starlette.types import ASGIApp, Scope
from starlette.websockets import WebSocket


def _prepare_response_content(
    res: Any,
    *,
    exclude_unset: bool,
    exclude_defaults: bool = False,
    exclude_none: bool = False,
) -> Any:
    if isinstance(res, BaseModel):
        read_with_orm_mode = getattr(res.__config__, "read_with_orm_mode", None)
        if read_with_orm_mode:
            # Let from_orm extract the data from this model instead of converting
            # it now to a dict.
            # Otherwise there's no way to extract lazy data that requires attribute
            # access instead of dict iteration, e.g. lazy relationships.
            return res
        return res.dict(
            by_alias=True,
            exclude_unset=exclude_unset,
            exclude_defaults=exclude_defaults,
            exclude_none=exclude_none,
        )
    elif isinstance(res, list):
        return [
            _prepare_response_content(
                item,
                exclude_unset=exclude_unset,
                exclude_defaults=exclude_defaults,
                exclude_none=exclude_none,
            )
            for item in res
        ]
    elif isinstance(res, dict):
        return {
            k: _prepare_response_content(
                v,
                exclude_unset=exclude_unset,
                exclude_defaults=exclude_defaults,
                exclude_none=exclude_none,
            )
            for k, v in res.items()
        }
    elif dataclasses.is_dataclass(res):
        return dataclasses.asdict(res)
    return res


async def serialize_response(
    *,
    field: Optional[ModelField] = None,
    response_content: Any,
    include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
    exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
    by_alias: bool = True,
    exclude_unset: bool = False,
    exclude_defaults: bool = False,
    exclude_none: bool = False,
    is_coroutine: bool = True,
) -> Any:
    if field:
        errors = []
        response_content = _prepare_response_content(
            response_content,
            exclude_unset=exclude_unset,
            exclude_defaults=exclude_defaults,
            exclude_none=exclude_none,
        )
        if is_coroutine:
            value, errors_ = field.validate(response_content, {}, loc=("response",))
        else:
            value, errors_ = await run_in_threadpool(
                field.validate, response_content, {}, loc=("response",)
            )
        if isinstance(errors_, ErrorWrapper):
            errors.append(errors_)
        elif isinstance(errors_, list):
            errors.extend(errors_)
        if errors:
            raise ValidationError(errors, field.type_)
        return jsonable_encoder(
            value,
            include=include,
            exclude=exclude,
            by_alias=by_alias,
            exclude_unset=exclude_unset,
            exclude_defaults=exclude_defaults,
            exclude_none=exclude_none,
        )
    else:
        return jsonable_encoder(response_content)


async def run_endpoint_function(
    *, dependant: Dependant, values: Dict[str, Any], is_coroutine: bool
) -> Any:
    # Only called by get_request_handler. Has been split into its own function to
    # facilitate profiling endpoints, since inner functions are harder to profile.
    assert dependant.call is not None, "dependant.call must be a function"

    if is_coroutine:
        return await dependant.call(**values)
    else:
        return await run_in_threadpool(dependant.call, **values)


def get_request_handler(
    dependant: Dependant,
    body_field: Optional[ModelField] = None,
    status_code: Optional[int] = None,
    response_class: Union[Type[Response], DefaultPlaceholder] = Default(JSONResponse),
    response_field: Optional[ModelField] = None,
    response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
    response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
    response_model_by_alias: bool = True,
    response_model_exclude_unset: bool = False,
    response_model_exclude_defaults: bool = False,
    response_model_exclude_none: bool = False,
    dependency_overrides_provider: Optional[Any] = None,
) -> Callable[[Request], Coroutine[Any, Any, Response]]:
    assert dependant.call is not None, "dependant.call must be a function"
    is_coroutine = asyncio.iscoroutinefunction(dependant.call)
    is_body_form = body_field and isinstance(body_field.field_info, params.Form)
    if isinstance(response_class, DefaultPlaceholder):
        actual_response_class: Type[Response] = response_class.value
    else:
        actual_response_class = response_class

    async def app(request: Request) -> Response:
        try:
            body: Any = None
            if body_field:
                if is_body_form:
                    body = await request.form()
                else:
                    body_bytes = await request.body()
                    if body_bytes:
                        json_body: Any = Undefined
                        content_type_value = request.headers.get("content-type")
                        if not content_type_value:
                            json_body = await request.json()
                        else:
                            message = email.message.Message()
                            message["content-type"] = content_type_value
                            if message.get_content_maintype() == "application":
                                subtype = message.get_content_subtype()
                                if subtype == "json" or subtype.endswith("+json"):
                                    json_body = await request.json()
                        if json_body != Undefined:
                            body = json_body
                        else:
                            body = body_bytes
        except json.JSONDecodeError as e:
            raise RequestValidationError([ErrorWrapper(e, ("body", e.pos))], body=e.doc)
        except Exception as e:
            raise HTTPException(
                status_code=400, detail="There was an error parsing the body"
            ) from e
        solved_result = await solve_dependencies(
            request=request,
            dependant=dependant,
            body=body,
            dependency_overrides_provider=dependency_overrides_provider,
        )
        values, errors, background_tasks, sub_response, _ = solved_result
        if errors:
            raise RequestValidationError(errors, body=body)
        else:
            raw_response = await run_endpoint_function(
                dependant=dependant, values=values, is_coroutine=is_coroutine
            )

            if isinstance(raw_response, Response):
                if raw_response.background is None:
                    raw_response.background = background_tasks
                return raw_response
            response_data = await serialize_response(
                field=response_field,
                response_content=raw_response,
                include=response_model_include,
                exclude=response_model_exclude,
                by_alias=response_model_by_alias,
                exclude_unset=response_model_exclude_unset,
                exclude_defaults=response_model_exclude_defaults,
                exclude_none=response_model_exclude_none,
                is_coroutine=is_coroutine,
            )
            response_args: Dict[str, Any] = {"background": background_tasks}
            # If status_code was set, use it, otherwise use the default from the
            # response class, in the case of redirect it's 307
            if status_code is not None:
                response_args["status_code"] = status_code
            response = actual_response_class(response_data, **response_args)
            response.headers.raw.extend(sub_response.headers.raw)
            if sub_response.status_code:
                response.status_code = sub_response.status_code
            return response

    return app


def get_websocket_app(
    dependant: Dependant, dependency_overrides_provider: Optional[Any] = None
) -> Callable[[WebSocket], Coroutine[Any, Any, Any]]:
    async def app(websocket: WebSocket) -> None:
        solved_result = await solve_dependencies(
            request=websocket,
            dependant=dependant,
            dependency_overrides_provider=dependency_overrides_provider,
        )
        values, errors, _, _2, _3 = solved_result
        if errors:
            await websocket.close(code=WS_1008_POLICY_VIOLATION)
            raise WebSocketRequestValidationError(errors)
        assert dependant.call is not None, "dependant.call must be a function"
        await dependant.call(**values)

    return app


class APIWebSocketRoute(routing.WebSocketRoute):
    def __init__(
        self,
        path: str,
        endpoint: Callable[..., Any],
        *,
        dependencies: Optional[Sequence[params.Depends]] = None,
        name: Optional[str] = None,
        dependency_overrides_provider: Optional[Any] = None,
    ) -> None:
        self.path = path
        self.endpoint = endpoint
        self.dependencies = dependencies or []
        self.name = get_name(endpoint) if name is None else name
        self.path_regex, self.path_format, self.param_convertors = compile_path(path)
        self.dependant = get_dependant(path=path, call=self.endpoint)
        for depends in self.dependencies[::-1]:
            self.dependant.dependencies.insert(
                0,
                get_parameterless_sub_dependant(depends=depends, path=self.path_format),
            )
        self.app = websocket_session(
            get_websocket_app(
                dependant=self.dependant,
                dependency_overrides_provider=dependency_overrides_provider,
            )
        )

    def matches(self, scope: Scope) -> Tuple[Match, Scope]:
        match, child_scope = super().matches(scope)
        if match != Match.NONE:
            child_scope["route"] = self
        return match, child_scope


class APIRoute(routing.Route):
    def __init__(
        self,
        path: str,
        endpoint: Callable[..., Any],
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        name: Optional[str] = None,
        methods: Optional[Union[Set[str], List[str]]] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Union[Type[Response], DefaultPlaceholder] = Default(
            JSONResponse
        ),
        dependency_overrides_provider: Optional[Any] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Union[
            Callable[["APIRoute"], str], DefaultPlaceholder
        ] = Default(generate_unique_id),
    ) -> None:
        self.path = path
        self.endpoint = endpoint
        self.response_model = response_model
        self.summary = summary
        self.response_description = response_description
        self.deprecated = deprecated
        self.operation_id = operation_id
        self.response_model_include = response_model_include
        self.response_model_exclude = response_model_exclude
        self.response_model_by_alias = response_model_by_alias
        self.response_model_exclude_unset = response_model_exclude_unset
        self.response_model_exclude_defaults = response_model_exclude_defaults
        self.response_model_exclude_none = response_model_exclude_none
        self.include_in_schema = include_in_schema
        self.response_class = response_class
        self.dependency_overrides_provider = dependency_overrides_provider
        self.callbacks = callbacks
        self.openapi_extra = openapi_extra
        self.generate_unique_id_function = generate_unique_id_function
        self.tags = tags or []
        self.responses = responses or {}
        self.name = get_name(endpoint) if name is None else name
        self.path_regex, self.path_format, self.param_convertors = compile_path(path)
        if methods is None:
            methods = ["GET"]
        self.methods: Set[str] = set([method.upper() for method in methods])
        if isinstance(generate_unique_id_function, DefaultPlaceholder):
            current_generate_unique_id: Callable[
                ["APIRoute"], str
            ] = generate_unique_id_function.value
        else:
            current_generate_unique_id = generate_unique_id_function
        self.unique_id = self.operation_id or current_generate_unique_id(self)
        # normalize enums e.g. http.HTTPStatus
        if isinstance(status_code, IntEnum):
            status_code = int(status_code)
        self.status_code = status_code
        if self.response_model:
            assert (
                status_code not in STATUS_CODES_WITH_NO_BODY
            ), f"Status code {status_code} must not have a response body"
            response_name = "Response_" + self.unique_id
            self.response_field = create_response_field(
                name=response_name, type_=self.response_model
            )
            # Create a clone of the field, so that a Pydantic submodel is not returned
            # as is just because it's an instance of a subclass of a more limited class
            # e.g. UserInDB (containing hashed_password) could be a subclass of User
            # that doesn't have the hashed_password. But because it's a subclass, it
            # would pass the validation and be returned as is.
            # By being a new field, no inheritance will be passed as is. A new model
            # will be always created.
            self.secure_cloned_response_field: Optional[
                ModelField
            ] = create_cloned_field(self.response_field)
        else:
            self.response_field = None  # type: ignore
            self.secure_cloned_response_field = None
        self.dependencies = dependencies or []
        self.description = description or inspect.cleandoc(self.endpoint.__doc__ or "")
        # if a "form feed" character (page break) is found in the description text,
        # truncate description text to the content preceding the first "form feed"
        self.description = self.description.split("\f")[0]
        response_fields = {}
        for additional_status_code, response in self.responses.items():
            assert isinstance(response, dict), "An additional response must be a dict"
            model = response.get("model")
            if model:
                assert (
                    additional_status_code not in STATUS_CODES_WITH_NO_BODY
                ), f"Status code {additional_status_code} must not have a response body"
                response_name = f"Response_{additional_status_code}_{self.unique_id}"
                response_field = create_response_field(name=response_name, type_=model)
                response_fields[additional_status_code] = response_field
        if response_fields:
            self.response_fields: Dict[Union[int, str], ModelField] = response_fields
        else:
            self.response_fields = {}

        assert callable(endpoint), "An endpoint must be a callable"
        self.dependant = get_dependant(path=self.path_format, call=self.endpoint)
        for depends in self.dependencies[::-1]:
            self.dependant.dependencies.insert(
                0,
                get_parameterless_sub_dependant(depends=depends, path=self.path_format),
            )
        self.body_field = get_body_field(dependant=self.dependant, name=self.unique_id)
        self.app = request_response(self.get_route_handler())

    def get_route_handler(self) -> Callable[[Request], Coroutine[Any, Any, Response]]:
        return get_request_handler(
            dependant=self.dependant,
            body_field=self.body_field,
            status_code=self.status_code,
            response_class=self.response_class,
            response_field=self.secure_cloned_response_field,
            response_model_include=self.response_model_include,
            response_model_exclude=self.response_model_exclude,
            response_model_by_alias=self.response_model_by_alias,
            response_model_exclude_unset=self.response_model_exclude_unset,
            response_model_exclude_defaults=self.response_model_exclude_defaults,
            response_model_exclude_none=self.response_model_exclude_none,
            dependency_overrides_provider=self.dependency_overrides_provider,
        )

    def matches(self, scope: Scope) -> Tuple[Match, Scope]:
        match, child_scope = super().matches(scope)
        if match != Match.NONE:
            child_scope["route"] = self
        return match, child_scope


class APIRouter(routing.Router):
    def __init__(
        self,
        *,
        prefix: str = "",
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        default_response_class: Type[Response] = Default(JSONResponse),
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        routes: Optional[List[routing.BaseRoute]] = None,
        redirect_slashes: bool = True,
        default: Optional[ASGIApp] = None,
        dependency_overrides_provider: Optional[Any] = None,
        route_class: Type[APIRoute] = APIRoute,
        on_startup: Optional[Sequence[Callable[[], Any]]] = None,
        on_shutdown: Optional[Sequence[Callable[[], Any]]] = None,
        deprecated: Optional[bool] = None,
        include_in_schema: bool = True,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> None:
        super().__init__(
            routes=routes,  # type: ignore # in Starlette
            redirect_slashes=redirect_slashes,
            default=default,  # type: ignore # in Starlette
            on_startup=on_startup,  # type: ignore # in Starlette
            on_shutdown=on_shutdown,  # type: ignore # in Starlette
        )
        if prefix:
            assert prefix.startswith("/"), "A path prefix must start with '/'"
            assert not prefix.endswith(
                "/"
            ), "A path prefix must not end with '/', as the routes will start with '/'"
        self.prefix = prefix
        self.tags: List[Union[str, Enum]] = tags or []
        self.dependencies = dependencies or []
        self.deprecated = deprecated
        self.include_in_schema = include_in_schema
        self.responses = responses or {}
        self.callbacks = callbacks or []
        self.dependency_overrides_provider = dependency_overrides_provider
        self.route_class = route_class
        self.default_response_class = default_response_class
        self.generate_unique_id_function = generate_unique_id_function

    def add_api_route(
        self,
        path: str,
        endpoint: Callable[..., Any],
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        methods: Optional[Union[Set[str], List[str]]] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Union[Type[Response], DefaultPlaceholder] = Default(
            JSONResponse
        ),
        name: Optional[str] = None,
        route_class_override: Optional[Type[APIRoute]] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Union[
            Callable[[APIRoute], str], DefaultPlaceholder
        ] = Default(generate_unique_id),
    ) -> None:
        route_class = route_class_override or self.route_class
        responses = responses or {}
        combined_responses = {**self.responses, **responses}
        current_response_class = get_value_or_default(
            response_class, self.default_response_class
        )
        current_tags = self.tags.copy()
        if tags:
            current_tags.extend(tags)
        current_dependencies = list(self.dependencies)
        if dependencies:
            current_dependencies.extend(dependencies)
        current_callbacks = self.callbacks.copy()
        if callbacks:
            current_callbacks.extend(callbacks)
        current_generate_unique_id = get_value_or_default(
            generate_unique_id_function, self.generate_unique_id_function
        )
        route = route_class(
            self.prefix + path,
            endpoint=endpoint,
            response_model=response_model,
            status_code=status_code,
            tags=current_tags,
            dependencies=current_dependencies,
            summary=summary,
            description=description,
            response_description=response_description,
            responses=combined_responses,
            deprecated=deprecated or self.deprecated,
            methods=methods,
            operation_id=operation_id,
            response_model_include=response_model_include,
            response_model_exclude=response_model_exclude,
            response_model_by_alias=response_model_by_alias,
            response_model_exclude_unset=response_model_exclude_unset,
            response_model_exclude_defaults=response_model_exclude_defaults,
            response_model_exclude_none=response_model_exclude_none,
            include_in_schema=include_in_schema and self.include_in_schema,
            response_class=current_response_class,
            name=name,
            dependency_overrides_provider=self.dependency_overrides_provider,
            callbacks=current_callbacks,
            openapi_extra=openapi_extra,
            generate_unique_id_function=current_generate_unique_id,
        )
        self.routes.append(route)

    def api_route(
        self,
        path: str,
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        methods: Optional[List[str]] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Type[Response] = Default(JSONResponse),
        name: Optional[str] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        def decorator(func: DecoratedCallable) -> DecoratedCallable:
            self.add_api_route(
                path,
                func,
                response_model=response_model,
                status_code=status_code,
                tags=tags,
                dependencies=dependencies,
                summary=summary,
                description=description,
                response_description=response_description,
                responses=responses,
                deprecated=deprecated,
                methods=methods,
                operation_id=operation_id,
                response_model_include=response_model_include,
                response_model_exclude=response_model_exclude,
                response_model_by_alias=response_model_by_alias,
                response_model_exclude_unset=response_model_exclude_unset,
                response_model_exclude_defaults=response_model_exclude_defaults,
                response_model_exclude_none=response_model_exclude_none,
                include_in_schema=include_in_schema,
                response_class=response_class,
                name=name,
                callbacks=callbacks,
                openapi_extra=openapi_extra,
                generate_unique_id_function=generate_unique_id_function,
            )
            return func

        return decorator

    def add_api_websocket_route(
        self,
        path: str,
        endpoint: Callable[..., Any],
        *,
        dependencies: Optional[Sequence[params.Depends]] = None,
        name: Optional[str] = None,
    ) -> None:
        current_dependencies = list(self.dependencies)
        if dependencies:
            current_dependencies.extend(dependencies)

        route = APIWebSocketRoute(
            path,
            endpoint=endpoint,
            name=name,
            dependency_overrides_provider=self.dependency_overrides_provider,
            dependencies=current_dependencies,
        )
        self.routes.append(route)

    def websocket(
        self,
        path: str,
        *,
        dependencies: Optional[Sequence[params.Depends]] = None,
        name: Optional[str] = None,
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        def decorator(func: DecoratedCallable) -> DecoratedCallable:
            self.add_api_websocket_route(
                path, func, name=name, dependencies=dependencies
            )
            return func

        return decorator

    def include_router(
        self,
        router: "APIRouter",
        *,
        prefix: str = "",
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        default_response_class: Type[Response] = Default(JSONResponse),
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        deprecated: Optional[bool] = None,
        include_in_schema: bool = True,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> None:
        if prefix:
            assert prefix.startswith("/"), "A path prefix must start with '/'"
            assert not prefix.endswith(
                "/"
            ), "A path prefix must not end with '/', as the routes will start with '/'"
        else:
            for r in router.routes:
                path = getattr(r, "path")
                name = getattr(r, "name", "unknown")
                if path is not None and not path:
                    raise Exception(
                        f"Prefix and path cannot be both empty (path operation: {name})"
                    )
        if responses is None:
            responses = {}
        for route in router.routes:
            if isinstance(route, APIRoute):
                combined_responses = {**responses, **route.responses}
                use_response_class = get_value_or_default(
                    route.response_class,
                    router.default_response_class,
                    default_response_class,
                    self.default_response_class,
                )
                current_tags = []
                if tags:
                    current_tags.extend(tags)
                if route.tags:
                    current_tags.extend(route.tags)
                current_dependencies: List[params.Depends] = []
                if dependencies:
                    current_dependencies.extend(dependencies)
                if route.dependencies:
                    current_dependencies.extend(route.dependencies)
                current_callbacks = []
                if callbacks:
                    current_callbacks.extend(callbacks)
                if route.callbacks:
                    current_callbacks.extend(route.callbacks)
                current_generate_unique_id = get_value_or_default(
                    route.generate_unique_id_function,
                    router.generate_unique_id_function,
                    generate_unique_id_function,
                    self.generate_unique_id_function,
                )
                self.add_api_route(
                    prefix + route.path,
                    route.endpoint,
                    response_model=route.response_model,
                    status_code=route.status_code,
                    tags=current_tags,
                    dependencies=current_dependencies,
                    summary=route.summary,
                    description=route.description,
                    response_description=route.response_description,
                    responses=combined_responses,
                    deprecated=route.deprecated or deprecated or self.deprecated,
                    methods=route.methods,
                    operation_id=route.operation_id,
                    response_model_include=route.response_model_include,
                    response_model_exclude=route.response_model_exclude,
                    response_model_by_alias=route.response_model_by_alias,
                    response_model_exclude_unset=route.response_model_exclude_unset,
                    response_model_exclude_defaults=route.response_model_exclude_defaults,
                    response_model_exclude_none=route.response_model_exclude_none,
                    include_in_schema=route.include_in_schema
                    and self.include_in_schema
                    and include_in_schema,
                    response_class=use_response_class,
                    name=route.name,
                    route_class_override=type(route),
                    callbacks=current_callbacks,
                    openapi_extra=route.openapi_extra,
                    generate_unique_id_function=current_generate_unique_id,
                )
            elif isinstance(route, routing.Route):
                methods = list(route.methods or [])  # type: ignore # in Starlette
                self.add_route(
                    prefix + route.path,
                    route.endpoint,
                    methods=methods,
                    include_in_schema=route.include_in_schema,
                    name=route.name,
                )
            elif isinstance(route, APIWebSocketRoute):
                current_dependencies: List[params.Depends] = []
                if dependencies:
                    current_dependencies.extend(dependencies)
                if route.dependencies:
                    current_dependencies.extend(route.dependencies)
                self.add_api_websocket_route(
                    prefix + route.path,
                    route.endpoint,
                    dependencies=current_dependencies,
                    name=route.name,
                )
            elif isinstance(route, routing.WebSocketRoute):
                self.add_websocket_route(
                    prefix + route.path, route.endpoint, name=route.name
                )
        for handler in router.on_startup:
            self.add_event_handler("startup", handler)
        for handler in router.on_shutdown:
            self.add_event_handler("shutdown", handler)

    def get(
        self,
        path: str,
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Type[Response] = Default(JSONResponse),
        name: Optional[str] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        return self.api_route(
            path=path,
            response_model=response_model,
            status_code=status_code,
            tags=tags,
            dependencies=dependencies,
            summary=summary,
            description=description,
            response_description=response_description,
            responses=responses,
            deprecated=deprecated,
            methods=["GET"],
            operation_id=operation_id,
            response_model_include=response_model_include,
            response_model_exclude=response_model_exclude,
            response_model_by_alias=response_model_by_alias,
            response_model_exclude_unset=response_model_exclude_unset,
            response_model_exclude_defaults=response_model_exclude_defaults,
            response_model_exclude_none=response_model_exclude_none,
            include_in_schema=include_in_schema,
            response_class=response_class,
            name=name,
            callbacks=callbacks,
            openapi_extra=openapi_extra,
            generate_unique_id_function=generate_unique_id_function,
        )

    def put(
        self,
        path: str,
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Type[Response] = Default(JSONResponse),
        name: Optional[str] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        return self.api_route(
            path=path,
            response_model=response_model,
            status_code=status_code,
            tags=tags,
            dependencies=dependencies,
            summary=summary,
            description=description,
            response_description=response_description,
            responses=responses,
            deprecated=deprecated,
            methods=["PUT"],
            operation_id=operation_id,
            response_model_include=response_model_include,
            response_model_exclude=response_model_exclude,
            response_model_by_alias=response_model_by_alias,
            response_model_exclude_unset=response_model_exclude_unset,
            response_model_exclude_defaults=response_model_exclude_defaults,
            response_model_exclude_none=response_model_exclude_none,
            include_in_schema=include_in_schema,
            response_class=response_class,
            name=name,
            callbacks=callbacks,
            openapi_extra=openapi_extra,
            generate_unique_id_function=generate_unique_id_function,
        )

    def post(
        self,
        path: str,
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Type[Response] = Default(JSONResponse),
        name: Optional[str] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        return self.api_route(
            path=path,
            response_model=response_model,
            status_code=status_code,
            tags=tags,
            dependencies=dependencies,
            summary=summary,
            description=description,
            response_description=response_description,
            responses=responses,
            deprecated=deprecated,
            methods=["POST"],
            operation_id=operation_id,
            response_model_include=response_model_include,
            response_model_exclude=response_model_exclude,
            response_model_by_alias=response_model_by_alias,
            response_model_exclude_unset=response_model_exclude_unset,
            response_model_exclude_defaults=response_model_exclude_defaults,
            response_model_exclude_none=response_model_exclude_none,
            include_in_schema=include_in_schema,
            response_class=response_class,
            name=name,
            callbacks=callbacks,
            openapi_extra=openapi_extra,
            generate_unique_id_function=generate_unique_id_function,
        )

    def delete(
        self,
        path: str,
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Type[Response] = Default(JSONResponse),
        name: Optional[str] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        return self.api_route(
            path=path,
            response_model=response_model,
            status_code=status_code,
            tags=tags,
            dependencies=dependencies,
            summary=summary,
            description=description,
            response_description=response_description,
            responses=responses,
            deprecated=deprecated,
            methods=["DELETE"],
            operation_id=operation_id,
            response_model_include=response_model_include,
            response_model_exclude=response_model_exclude,
            response_model_by_alias=response_model_by_alias,
            response_model_exclude_unset=response_model_exclude_unset,
            response_model_exclude_defaults=response_model_exclude_defaults,
            response_model_exclude_none=response_model_exclude_none,
            include_in_schema=include_in_schema,
            response_class=response_class,
            name=name,
            callbacks=callbacks,
            openapi_extra=openapi_extra,
            generate_unique_id_function=generate_unique_id_function,
        )

    def options(
        self,
        path: str,
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Type[Response] = Default(JSONResponse),
        name: Optional[str] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        return self.api_route(
            path=path,
            response_model=response_model,
            status_code=status_code,
            tags=tags,
            dependencies=dependencies,
            summary=summary,
            description=description,
            response_description=response_description,
            responses=responses,
            deprecated=deprecated,
            methods=["OPTIONS"],
            operation_id=operation_id,
            response_model_include=response_model_include,
            response_model_exclude=response_model_exclude,
            response_model_by_alias=response_model_by_alias,
            response_model_exclude_unset=response_model_exclude_unset,
            response_model_exclude_defaults=response_model_exclude_defaults,
            response_model_exclude_none=response_model_exclude_none,
            include_in_schema=include_in_schema,
            response_class=response_class,
            name=name,
            callbacks=callbacks,
            openapi_extra=openapi_extra,
            generate_unique_id_function=generate_unique_id_function,
        )

    def head(
        self,
        path: str,
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Type[Response] = Default(JSONResponse),
        name: Optional[str] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        return self.api_route(
            path=path,
            response_model=response_model,
            status_code=status_code,
            tags=tags,
            dependencies=dependencies,
            summary=summary,
            description=description,
            response_description=response_description,
            responses=responses,
            deprecated=deprecated,
            methods=["HEAD"],
            operation_id=operation_id,
            response_model_include=response_model_include,
            response_model_exclude=response_model_exclude,
            response_model_by_alias=response_model_by_alias,
            response_model_exclude_unset=response_model_exclude_unset,
            response_model_exclude_defaults=response_model_exclude_defaults,
            response_model_exclude_none=response_model_exclude_none,
            include_in_schema=include_in_schema,
            response_class=response_class,
            name=name,
            callbacks=callbacks,
            openapi_extra=openapi_extra,
            generate_unique_id_function=generate_unique_id_function,
        )

    def patch(
        self,
        path: str,
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Type[Response] = Default(JSONResponse),
        name: Optional[str] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:
        return self.api_route(
            path=path,
            response_model=response_model,
            status_code=status_code,
            tags=tags,
            dependencies=dependencies,
            summary=summary,
            description=description,
            response_description=response_description,
            responses=responses,
            deprecated=deprecated,
            methods=["PATCH"],
            operation_id=operation_id,
            response_model_include=response_model_include,
            response_model_exclude=response_model_exclude,
            response_model_by_alias=response_model_by_alias,
            response_model_exclude_unset=response_model_exclude_unset,
            response_model_exclude_defaults=response_model_exclude_defaults,
            response_model_exclude_none=response_model_exclude_none,
            include_in_schema=include_in_schema,
            response_class=response_class,
            name=name,
            callbacks=callbacks,
            openapi_extra=openapi_extra,
            generate_unique_id_function=generate_unique_id_function,
        )

    def trace(
        self,
        path: str,
        *,
        response_model: Optional[Type[Any]] = None,
        status_code: Optional[int] = None,
        tags: Optional[List[Union[str, Enum]]] = None,
        dependencies: Optional[Sequence[params.Depends]] = None,
        summary: Optional[str] = None,
        description: Optional[str] = None,
        response_description: str = "Successful Response",
        responses: Optional[Dict[Union[int, str], Dict[str, Any]]] = None,
        deprecated: Optional[bool] = None,
        operation_id: Optional[str] = None,
        response_model_include: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_exclude: Optional[Union[SetIntStr, DictIntStrAny]] = None,
        response_model_by_alias: bool = True,
        response_model_exclude_unset: bool = False,
        response_model_exclude_defaults: bool = False,
        response_model_exclude_none: bool = False,
        include_in_schema: bool = True,
        response_class: Type[Response] = Default(JSONResponse),
        name: Optional[str] = None,
        callbacks: Optional[List[BaseRoute]] = None,
        openapi_extra: Optional[Dict[str, Any]] = None,
        generate_unique_id_function: Callable[[APIRoute], str] = Default(
            generate_unique_id
        ),
    ) -> Callable[[DecoratedCallable], DecoratedCallable]:

        return self.api_route(
            path=path,
            response_model=response_model,
            status_code=status_code,
            tags=tags,
            dependencies=dependencies,
            summary=summary,
            description=description,
            response_description=response_description,
            responses=responses,
            deprecated=deprecated,
            methods=["TRACE"],
            operation_id=operation_id,
            response_model_include=response_model_include,
            response_model_exclude=response_model_exclude,
            response_model_by_alias=response_model_by_alias,
            response_model_exclude_unset=response_model_exclude_unset,
            response_model_exclude_defaults=response_model_exclude_defaults,
            response_model_exclude_none=response_model_exclude_none,
            include_in_schema=include_in_schema,
            response_class=response_class,
            name=name,
            callbacks=callbacks,
            openapi_extra=openapi_extra,
            generate_unique_id_function=generate_unique_id_function,
        )