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Specification⚓︎

If you need the complete Specification, go to http://127.0.0.1:5000/openapi/openapi.json

command: flask openapi⚓︎

The flask openapi command will export the OpenAPI Specification to console when you execute the command.

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flask --app IMPORT openapi
where IMPORT is the Flask application, in our case an OpenAPI application, to loan. For example, if your OpenAPI application is app defined in hello.py, as in the example in Quickstart, the command is flask --app hello:app openapi. (For more information about the command line interface of Flask, please check out the Flask CLI documentation.)

Execute flask --app IMPORT openapi --help for more information about the command:

Again, assuming your OpenAPI application is app defined in hello.py,

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flask --app hello:app openapi --help

Usage: flask openapi [OPTIONS]

  Export the OpenAPI Specification to console or a file

Options:
  -o, --output PATH               The output file path.
  -f, --format [json|yaml]
                                  The output file format.
  -i, --indent INTEGER            The indentation for JSON dumps.
  --help                          Show this message and exit.

Please note, by default, the command will export the OpenAPI specification in JSON. If you want the OpenAPI specification in YAML, by running the command with the -f yaml option, you need to install the pyyaml package. 

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pip install flask-openapi3[yaml]

# or
pip install pyyaml

info⚓︎

flask-openapi3 provide Swagger UI, Redoc and RapiDoc interactive documentation. Before that, you should know something about the OpenAPI Specification.

You must import Info from flask-openapi3, it needs some parameters: title, version... , more information sees the OpenAPI Specification Info Object.

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from flask_openapi3 import Info
from flask_openapi3 import OpenAPI, APIBlueprint

info = Info(title='book API', version='1.0.0')
app = OpenAPI(__name__, info=info)
api = APIBlueprint('/book', __name__, url_prefix='/api')

if __name__ == '__main__':
    app.run()

run it, and go to http://127.0.0.1:5000/openapi, you will see the documentation.

openapi image-20210525160157057

security_schemes⚓︎

There are some examples for Security Scheme Object, more features see the OpenAPI Specification Security Scheme Object.

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# Basic Authentication Sample
basic = {
  "type": "http",
  "scheme": "basic"
}
# JWT Bearer Sample
jwt = {
  "type": "http",
  "scheme": "bearer",
  "bearerFormat": "JWT"
}
# API Key Sample
api_key = {
  "type": "apiKey",
  "name": "api_key",
  "in": "header"
}
# Implicit OAuth2 Sample
oauth2 = {
  "type": "oauth2",
  "flows": {
    "implicit": {
      "authorizationUrl": "https://example.com/api/oauth/dialog",
      "scopes": {
        "write:pets": "modify pets in your account",
        "read:pets": "read your pets"
      }
    }
  }
}
security_schemes = {"jwt": jwt, "api_key": api_key, "oauth2": oauth2, "basic": basic}

First, you need to define the security_schemes and security variable:

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jwt = {
    "type": "http",
    "scheme": "bearer",
    "bearerFormat": "JWT"
}
security_schemes = {"jwt": jwt}

security = [{"jwt": []}]

app = OpenAPI(__name__, info=info, security_schemes=security_schemes)

Second, add pass the security to your api, like this:

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@app.get('/book/<int:bid>', tags=[book_tag], security=security)
def get_book(path: Path, query: BookBody):
    ...

result:

image-20210525165350520

responses⚓︎

You can add responses for each API under the app wrapper.

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app = OpenAPI(
    __name__, 
    info=info, 
    responses={404: NotFoundResponse}
)

@app.get(...)
def endpoint():
    ...

abp_responses & view_responses⚓︎

You can add responses for each API under the api or api_view wrapper.

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class Unauthorized(BaseModel):
    code: int = Field(-1, description="Status Code")
    message: str = Field("Unauthorized!", description="Exception Information")


api = APIBlueprint(
    "/book", 
    __name__, 
    url_prefix="/api",
    abp_responses={401: Unauthorized}
)

api_view = APIView(
    "/book",
    view_responses={401: Unauthorized}
)

@api.get(...)
def endpoint():
    ...

doc_ui⚓︎

You can pass doc_ui=False to disable the OpenAPI spec when init OpenAPI.

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app = OpenAPI(__name__, info=info, doc_ui=False)

You can also use doc_ui in endpoint or when initializing APIBlueprint or APIView.

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api = APIBlueprint(
    '/book',
    __name__,
    doc_ui=False
)

# or

@api.get('/book', doc_ui=False)
def get_book():
    ...

servers⚓︎

An array of Server Objects, which provide connectivity information to a target server. If the server's property is not provided, or is an empty array, the default value would be a Server Object with an url value of /.

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from flask_openapi3 import OpenAPI, Server

servers = [
    Server(url='http://127.0.0.1:5000'),
    Server(url='https://127.0.0.1:5000'),
]
app = OpenAPI(__name__, info=info, servers=servers)

external_docs⚓︎

Allows referencing an external resource for extended documentation.

More information to see External Documentation Object.

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from flask_openapi3 import OpenAPI, ExternalDocumentation

external_docs=ExternalDocumentation(
    url="https://www.openapis.org/",
    description="Something great got better, get excited!"
)
app = OpenAPI(__name__, info=info, external_docs=external_docs)

openapi_extensions⚓︎

While the OpenAPI Specification tries to accommodate most use cases, additional data can be added to extend the specification at certain points. See Specification Extensions.

It can also be available in APIBlueprint and APIView, goto Operation.

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from flask_openapi3 import OpenAPI

app = OpenAPI(__name__, openapi_extensions={
    "x-google-endpoints": [
        {
            "name": "my-cool-api.endpoints.my-project-id.cloud.goog",
            "allowCors": True
        }
    ]
})

@app.get("/")
def hello():
    return "ok"


if __name__ == "__main__":
    app.run(debug=True)

validation error⚓︎

You can override validation error response use validation_error_status, validation_error_model and validation_error_callback.

  • validation_error_status: HTTP Status of the response given when a validation error is detected by pydantic. Defaults to 422.
  • validation_error_model: Validation error response model for OpenAPI Specification.
  • validation_error_callback: Validation error response callback, the return format corresponds to the validation_error_model. Receive ValidationError and return Flask Response.
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from flask.wrappers import Response as FlaskResponse
from pydantic import BaseModel, ValidationError

class ValidationErrorModel(BaseModel):
    code: str
    message: str


def validation_error_callback(e: ValidationError) -> FlaskResponse:
    validation_error_object = ValidationErrorModel(code="400", message=e.json())
    response = make_response(validation_error_object.json())
    response.headers["Content-Type"] = "application/json"
    response.status_code = getattr(current_app, "validation_error_status", 422)
    return response


app = OpenAPI(
    __name__,
    validation_error_status=400,
    validation_error_model=ValidationErrorModel,
    validation_error_callback=validation_error_callback
)