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| from typing import Any, Dict, List, Optional, Union, cast | |
| from fastapi.exceptions import HTTPException | |
| from fastapi.openapi.models import OAuth2 as OAuth2Model | |
| from fastapi.openapi.models import OAuthFlows as OAuthFlowsModel | |
| from fastapi.param_functions import Form | |
| from fastapi.security.base import SecurityBase | |
| from fastapi.security.utils import get_authorization_scheme_param | |
| from starlette.requests import Request | |
| from starlette.status import HTTP_401_UNAUTHORIZED, HTTP_403_FORBIDDEN | |
| # TODO: import from typing when deprecating Python 3.9 | |
| from typing_extensions import Annotated, Doc | |
| class OAuth2PasswordRequestForm: | |
| """ | |
| This is a dependency class to collect the `username` and `password` as form data | |
| for an OAuth2 password flow. | |
| The OAuth2 specification dictates that for a password flow the data should be | |
| collected using form data (instead of JSON) and that it should have the specific | |
| fields `username` and `password`. | |
| All the initialization parameters are extracted from the request. | |
| Read more about it in the | |
| [FastAPI docs for Simple OAuth2 with Password and Bearer](https://fastapi.tiangolo.com/tutorial/security/simple-oauth2/). | |
| ## Example | |
| ```python | |
| from typing import Annotated | |
| from fastapi import Depends, FastAPI | |
| from fastapi.security import OAuth2PasswordRequestForm | |
| app = FastAPI() | |
| @app.post("/login") | |
| def login(form_data: Annotated[OAuth2PasswordRequestForm, Depends()]): | |
| data = {} | |
| data["scopes"] = [] | |
| for scope in form_data.scopes: | |
| data["scopes"].append(scope) | |
| if form_data.client_id: | |
| data["client_id"] = form_data.client_id | |
| if form_data.client_secret: | |
| data["client_secret"] = form_data.client_secret | |
| return data | |
| ``` | |
| Note that for OAuth2 the scope `items:read` is a single scope in an opaque string. | |
| You could have custom internal logic to separate it by colon caracters (`:`) or | |
| similar, and get the two parts `items` and `read`. Many applications do that to | |
| group and organize permissions, you could do it as well in your application, just | |
| know that that it is application specific, it's not part of the specification. | |
| """ | |
| def __init__( | |
| self, | |
| *, | |
| grant_type: Annotated[ | |
| Union[str, None], | |
| Form(pattern="password"), | |
| Doc( | |
| """ | |
| The OAuth2 spec says it is required and MUST be the fixed string | |
| "password". Nevertheless, this dependency class is permissive and | |
| allows not passing it. If you want to enforce it, use instead the | |
| `OAuth2PasswordRequestFormStrict` dependency. | |
| """ | |
| ), | |
| ] = None, | |
| username: Annotated[ | |
| str, | |
| Form(), | |
| Doc( | |
| """ | |
| `username` string. The OAuth2 spec requires the exact field name | |
| `username`. | |
| """ | |
| ), | |
| ], | |
| password: Annotated[ | |
| str, | |
| Form(), | |
| Doc( | |
| """ | |
| `password` string. The OAuth2 spec requires the exact field name | |
| `password". | |
| """ | |
| ), | |
| ], | |
| scope: Annotated[ | |
| str, | |
| Form(), | |
| Doc( | |
| """ | |
| A single string with actually several scopes separated by spaces. Each | |
| scope is also a string. | |
| For example, a single string with: | |
| ```python | |
| "items:read items:write users:read profile openid" | |
| ```` | |
| would represent the scopes: | |
| * `items:read` | |
| * `items:write` | |
| * `users:read` | |
| * `profile` | |
| * `openid` | |
| """ | |
| ), | |
| ] = "", | |
| client_id: Annotated[ | |
| Union[str, None], | |
| Form(), | |
| Doc( | |
| """ | |
| If there's a `client_id`, it can be sent as part of the form fields. | |
| But the OAuth2 specification recommends sending the `client_id` and | |
| `client_secret` (if any) using HTTP Basic auth. | |
| """ | |
| ), | |
| ] = None, | |
| client_secret: Annotated[ | |
| Union[str, None], | |
| Form(), | |
| Doc( | |
| """ | |
| If there's a `client_password` (and a `client_id`), they can be sent | |
| as part of the form fields. But the OAuth2 specification recommends | |
| sending the `client_id` and `client_secret` (if any) using HTTP Basic | |
| auth. | |
| """ | |
| ), | |
| ] = None, | |
| ): | |
| self.grant_type = grant_type | |
| self.username = username | |
| self.password = password | |
| self.scopes = scope.split() | |
| self.client_id = client_id | |
| self.client_secret = client_secret | |
| class OAuth2PasswordRequestFormStrict(OAuth2PasswordRequestForm): | |
| """ | |
| This is a dependency class to collect the `username` and `password` as form data | |
| for an OAuth2 password flow. | |
| The OAuth2 specification dictates that for a password flow the data should be | |
| collected using form data (instead of JSON) and that it should have the specific | |
| fields `username` and `password`. | |
| All the initialization parameters are extracted from the request. | |
| The only difference between `OAuth2PasswordRequestFormStrict` and | |
| `OAuth2PasswordRequestForm` is that `OAuth2PasswordRequestFormStrict` requires the | |
| client to send the form field `grant_type` with the value `"password"`, which | |
| is required in the OAuth2 specification (it seems that for no particular reason), | |
| while for `OAuth2PasswordRequestForm` `grant_type` is optional. | |
| Read more about it in the | |
| [FastAPI docs for Simple OAuth2 with Password and Bearer](https://fastapi.tiangolo.com/tutorial/security/simple-oauth2/). | |
| ## Example | |
| ```python | |
| from typing import Annotated | |
| from fastapi import Depends, FastAPI | |
| from fastapi.security import OAuth2PasswordRequestForm | |
| app = FastAPI() | |
| @app.post("/login") | |
| def login(form_data: Annotated[OAuth2PasswordRequestFormStrict, Depends()]): | |
| data = {} | |
| data["scopes"] = [] | |
| for scope in form_data.scopes: | |
| data["scopes"].append(scope) | |
| if form_data.client_id: | |
| data["client_id"] = form_data.client_id | |
| if form_data.client_secret: | |
| data["client_secret"] = form_data.client_secret | |
| return data | |
| ``` | |
| Note that for OAuth2 the scope `items:read` is a single scope in an opaque string. | |
| You could have custom internal logic to separate it by colon caracters (`:`) or | |
| similar, and get the two parts `items` and `read`. Many applications do that to | |
| group and organize permissions, you could do it as well in your application, just | |
| know that that it is application specific, it's not part of the specification. | |
| grant_type: the OAuth2 spec says it is required and MUST be the fixed string "password". | |
| This dependency is strict about it. If you want to be permissive, use instead the | |
| OAuth2PasswordRequestForm dependency class. | |
| username: username string. The OAuth2 spec requires the exact field name "username". | |
| password: password string. The OAuth2 spec requires the exact field name "password". | |
| scope: Optional string. Several scopes (each one a string) separated by spaces. E.g. | |
| "items:read items:write users:read profile openid" | |
| client_id: optional string. OAuth2 recommends sending the client_id and client_secret (if any) | |
| using HTTP Basic auth, as: client_id:client_secret | |
| client_secret: optional string. OAuth2 recommends sending the client_id and client_secret (if any) | |
| using HTTP Basic auth, as: client_id:client_secret | |
| """ | |
| def __init__( | |
| self, | |
| grant_type: Annotated[ | |
| str, | |
| Form(pattern="password"), | |
| Doc( | |
| """ | |
| The OAuth2 spec says it is required and MUST be the fixed string | |
| "password". This dependency is strict about it. If you want to be | |
| permissive, use instead the `OAuth2PasswordRequestForm` dependency | |
| class. | |
| """ | |
| ), | |
| ], | |
| username: Annotated[ | |
| str, | |
| Form(), | |
| Doc( | |
| """ | |
| `username` string. The OAuth2 spec requires the exact field name | |
| `username`. | |
| """ | |
| ), | |
| ], | |
| password: Annotated[ | |
| str, | |
| Form(), | |
| Doc( | |
| """ | |
| `password` string. The OAuth2 spec requires the exact field name | |
| `password". | |
| """ | |
| ), | |
| ], | |
| scope: Annotated[ | |
| str, | |
| Form(), | |
| Doc( | |
| """ | |
| A single string with actually several scopes separated by spaces. Each | |
| scope is also a string. | |
| For example, a single string with: | |
| ```python | |
| "items:read items:write users:read profile openid" | |
| ```` | |
| would represent the scopes: | |
| * `items:read` | |
| * `items:write` | |
| * `users:read` | |
| * `profile` | |
| * `openid` | |
| """ | |
| ), | |
| ] = "", | |
| client_id: Annotated[ | |
| Union[str, None], | |
| Form(), | |
| Doc( | |
| """ | |
| If there's a `client_id`, it can be sent as part of the form fields. | |
| But the OAuth2 specification recommends sending the `client_id` and | |
| `client_secret` (if any) using HTTP Basic auth. | |
| """ | |
| ), | |
| ] = None, | |
| client_secret: Annotated[ | |
| Union[str, None], | |
| Form(), | |
| Doc( | |
| """ | |
| If there's a `client_password` (and a `client_id`), they can be sent | |
| as part of the form fields. But the OAuth2 specification recommends | |
| sending the `client_id` and `client_secret` (if any) using HTTP Basic | |
| auth. | |
| """ | |
| ), | |
| ] = None, | |
| ): | |
| super().__init__( | |
| grant_type=grant_type, | |
| username=username, | |
| password=password, | |
| scope=scope, | |
| client_id=client_id, | |
| client_secret=client_secret, | |
| ) | |
| class OAuth2(SecurityBase): | |
| """ | |
| This is the base class for OAuth2 authentication, an instance of it would be used | |
| as a dependency. All other OAuth2 classes inherit from it and customize it for | |
| each OAuth2 flow. | |
| You normally would not create a new class inheriting from it but use one of the | |
| existing subclasses, and maybe compose them if you want to support multiple flows. | |
| Read more about it in the | |
| [FastAPI docs for Security](https://fastapi.tiangolo.com/tutorial/security/). | |
| """ | |
| def __init__( | |
| self, | |
| *, | |
| flows: Annotated[ | |
| Union[OAuthFlowsModel, Dict[str, Dict[str, Any]]], | |
| Doc( | |
| """ | |
| The dictionary of OAuth2 flows. | |
| """ | |
| ), | |
| ] = OAuthFlowsModel(), | |
| scheme_name: Annotated[ | |
| Optional[str], | |
| Doc( | |
| """ | |
| Security scheme name. | |
| It will be included in the generated OpenAPI (e.g. visible at `/docs`). | |
| """ | |
| ), | |
| ] = None, | |
| description: Annotated[ | |
| Optional[str], | |
| Doc( | |
| """ | |
| Security scheme description. | |
| It will be included in the generated OpenAPI (e.g. visible at `/docs`). | |
| """ | |
| ), | |
| ] = None, | |
| auto_error: Annotated[ | |
| bool, | |
| Doc( | |
| """ | |
| By default, if no HTTP Authorization header is provided, required for | |
| OAuth2 authentication, it will automatically cancel the request and | |
| send the client an error. | |
| If `auto_error` is set to `False`, when the HTTP Authorization header | |
| is not available, instead of erroring out, the dependency result will | |
| be `None`. | |
| This is useful when you want to have optional authentication. | |
| It is also useful when you want to have authentication that can be | |
| provided in one of multiple optional ways (for example, with OAuth2 | |
| or in a cookie). | |
| """ | |
| ), | |
| ] = True, | |
| ): | |
| self.model = OAuth2Model( | |
| flows=cast(OAuthFlowsModel, flows), description=description | |
| ) | |
| self.scheme_name = scheme_name or self.__class__.__name__ | |
| self.auto_error = auto_error | |
| async def __call__(self, request: Request) -> Optional[str]: | |
| authorization = request.headers.get("Authorization") | |
| if not authorization: | |
| if self.auto_error: | |
| raise HTTPException( | |
| status_code=HTTP_403_FORBIDDEN, detail="Not authenticated" | |
| ) | |
| else: | |
| return None | |
| return authorization | |
| class OAuth2PasswordBearer(OAuth2): | |
| """ | |
| OAuth2 flow for authentication using a bearer token obtained with a password. | |
| An instance of it would be used as a dependency. | |
| Read more about it in the | |
| [FastAPI docs for Simple OAuth2 with Password and Bearer](https://fastapi.tiangolo.com/tutorial/security/simple-oauth2/). | |
| """ | |
| def __init__( | |
| self, | |
| tokenUrl: Annotated[ | |
| str, | |
| Doc( | |
| """ | |
| The URL to obtain the OAuth2 token. This would be the *path operation* | |
| that has `OAuth2PasswordRequestForm` as a dependency. | |
| """ | |
| ), | |
| ], | |
| scheme_name: Annotated[ | |
| Optional[str], | |
| Doc( | |
| """ | |
| Security scheme name. | |
| It will be included in the generated OpenAPI (e.g. visible at `/docs`). | |
| """ | |
| ), | |
| ] = None, | |
| scopes: Annotated[ | |
| Optional[Dict[str, str]], | |
| Doc( | |
| """ | |
| The OAuth2 scopes that would be required by the *path operations* that | |
| use this dependency. | |
| """ | |
| ), | |
| ] = None, | |
| description: Annotated[ | |
| Optional[str], | |
| Doc( | |
| """ | |
| Security scheme description. | |
| It will be included in the generated OpenAPI (e.g. visible at `/docs`). | |
| """ | |
| ), | |
| ] = None, | |
| auto_error: Annotated[ | |
| bool, | |
| Doc( | |
| """ | |
| By default, if no HTTP Authorization header is provided, required for | |
| OAuth2 authentication, it will automatically cancel the request and | |
| send the client an error. | |
| If `auto_error` is set to `False`, when the HTTP Authorization header | |
| is not available, instead of erroring out, the dependency result will | |
| be `None`. | |
| This is useful when you want to have optional authentication. | |
| It is also useful when you want to have authentication that can be | |
| provided in one of multiple optional ways (for example, with OAuth2 | |
| or in a cookie). | |
| """ | |
| ), | |
| ] = True, | |
| ): | |
| if not scopes: | |
| scopes = {} | |
| flows = OAuthFlowsModel( | |
| password=cast(Any, {"tokenUrl": tokenUrl, "scopes": scopes}) | |
| ) | |
| super().__init__( | |
| flows=flows, | |
| scheme_name=scheme_name, | |
| description=description, | |
| auto_error=auto_error, | |
| ) | |
| async def __call__(self, request: Request) -> Optional[str]: | |
| authorization = request.headers.get("Authorization") | |
| scheme, param = get_authorization_scheme_param(authorization) | |
| if not authorization or scheme.lower() != "bearer": | |
| if self.auto_error: | |
| raise HTTPException( | |
| status_code=HTTP_401_UNAUTHORIZED, | |
| detail="Not authenticated", | |
| headers={"WWW-Authenticate": "Bearer"}, | |
| ) | |
| else: | |
| return None | |
| return param | |
| class OAuth2AuthorizationCodeBearer(OAuth2): | |
| """ | |
| OAuth2 flow for authentication using a bearer token obtained with an OAuth2 code | |
| flow. An instance of it would be used as a dependency. | |
| """ | |
| def __init__( | |
| self, | |
| authorizationUrl: str, | |
| tokenUrl: Annotated[ | |
| str, | |
| Doc( | |
| """ | |
| The URL to obtain the OAuth2 token. | |
| """ | |
| ), | |
| ], | |
| refreshUrl: Annotated[ | |
| Optional[str], | |
| Doc( | |
| """ | |
| The URL to refresh the token and obtain a new one. | |
| """ | |
| ), | |
| ] = None, | |
| scheme_name: Annotated[ | |
| Optional[str], | |
| Doc( | |
| """ | |
| Security scheme name. | |
| It will be included in the generated OpenAPI (e.g. visible at `/docs`). | |
| """ | |
| ), | |
| ] = None, | |
| scopes: Annotated[ | |
| Optional[Dict[str, str]], | |
| Doc( | |
| """ | |
| The OAuth2 scopes that would be required by the *path operations* that | |
| use this dependency. | |
| """ | |
| ), | |
| ] = None, | |
| description: Annotated[ | |
| Optional[str], | |
| Doc( | |
| """ | |
| Security scheme description. | |
| It will be included in the generated OpenAPI (e.g. visible at `/docs`). | |
| """ | |
| ), | |
| ] = None, | |
| auto_error: Annotated[ | |
| bool, | |
| Doc( | |
| """ | |
| By default, if no HTTP Authorization header is provided, required for | |
| OAuth2 authentication, it will automatically cancel the request and | |
| send the client an error. | |
| If `auto_error` is set to `False`, when the HTTP Authorization header | |
| is not available, instead of erroring out, the dependency result will | |
| be `None`. | |
| This is useful when you want to have optional authentication. | |
| It is also useful when you want to have authentication that can be | |
| provided in one of multiple optional ways (for example, with OAuth2 | |
| or in a cookie). | |
| """ | |
| ), | |
| ] = True, | |
| ): | |
| if not scopes: | |
| scopes = {} | |
| flows = OAuthFlowsModel( | |
| authorizationCode=cast( | |
| Any, | |
| { | |
| "authorizationUrl": authorizationUrl, | |
| "tokenUrl": tokenUrl, | |
| "refreshUrl": refreshUrl, | |
| "scopes": scopes, | |
| }, | |
| ) | |
| ) | |
| super().__init__( | |
| flows=flows, | |
| scheme_name=scheme_name, | |
| description=description, | |
| auto_error=auto_error, | |
| ) | |
| async def __call__(self, request: Request) -> Optional[str]: | |
| authorization = request.headers.get("Authorization") | |
| scheme, param = get_authorization_scheme_param(authorization) | |
| if not authorization or scheme.lower() != "bearer": | |
| if self.auto_error: | |
| raise HTTPException( | |
| status_code=HTTP_401_UNAUTHORIZED, | |
| detail="Not authenticated", | |
| headers={"WWW-Authenticate": "Bearer"}, | |
| ) | |
| else: | |
| return None # pragma: nocover | |
| return param | |
| class SecurityScopes: | |
| """ | |
| This is a special class that you can define in a parameter in a dependency to | |
| obtain the OAuth2 scopes required by all the dependencies in the same chain. | |
| This way, multiple dependencies can have different scopes, even when used in the | |
| same *path operation*. And with this, you can access all the scopes required in | |
| all those dependencies in a single place. | |
| Read more about it in the | |
| [FastAPI docs for OAuth2 scopes](https://fastapi.tiangolo.com/advanced/security/oauth2-scopes/). | |
| """ | |
| def __init__( | |
| self, | |
| scopes: Annotated[ | |
| Optional[List[str]], | |
| Doc( | |
| """ | |
| This will be filled by FastAPI. | |
| """ | |
| ), | |
| ] = None, | |
| ): | |
| self.scopes: Annotated[ | |
| List[str], | |
| Doc( | |
| """ | |
| The list of all the scopes required by dependencies. | |
| """ | |
| ), | |
| ] = scopes or [] | |
| self.scope_str: Annotated[ | |
| str, | |
| Doc( | |
| """ | |
| All the scopes required by all the dependencies in a single string | |
| separated by spaces, as defined in the OAuth2 specification. | |
| """ | |
| ), | |
| ] = " ".join(self.scopes) | |