flask-rebar

Flask-Rebar combines flask, marshmallow, and swagger for robust REST services.

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Flask-Rebar

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Flask-Rebar combines flask <http://flask.pocoo.org/>, marshmallow <https://marshmallow.readthedocs.io/en/latest/>, and swagger <https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md>_ for robust REST services.

Features

  • Request and Response Validation - Flask-Rebar relies on schemas from the popular Marshmallow package to validate incoming requests and marshal outgoing responses.
  • Automatic Swagger Generation - The same schemas used for validation and marshaling are used to automatically generate OpenAPI specifications (a.k.a. Swagger). This also means automatic documentation via Swagger UI <https://swagger.io/swagger-ui/>_.
  • Error Handling - Uncaught exceptions from Flask-Rebar are converted to appropriate HTTP errors.

Example

.. code-block:: python

from flask import Flask from flask_rebar import errors, Rebar from marshmallow import fields, Schema

from my_app import database

rebar = Rebar()

All handler URL rules will be prefixed by '/v1'

registry = rebar.create_handler_registry(prefix='/v1')

class TodoSchema(Schema): id = fields.Integer() complete = fields.Boolean() description = fields.String()

This schema will validate the incoming request's query string

class GetTodosQueryStringSchema(Schema): complete = fields.Boolean()

This schema will marshal the outgoing response

class GetTodosResponseSchema(Schema): data = fields.Nested(TodoSchema, many=True)

@registry.handles( rule='/todos', method='GET', query_string_schema=GetTodosQueryStringSchema(), response_body_schema=GetTodosResponseSchema(), # for versions <= 1.7.0, use marshal_schema ) def get_todos(): """ This docstring will be rendered as the operation's description in the auto-generated OpenAPI specification. """

   # The query string has already been validated by `query_string_schema`
   complete = rebar.validated_args.get('complete')

   ...

   # Errors are converted to appropriate HTTP errors
   raise errors.Forbidden()

   ...

   # The response will be marshaled by `marshal_schema`
   return {'data': []}

def create_app(name): app = Flask(name) rebar.init_app(app) return app

if name == 'main': create_app(name).run()

For a more complete example, check out the example app at examples/todo.py <examples/todo/todo.py>. Some example requests to this example app can be found at examples/todo_output.md <examples/todo/todo_output.md>.

Installation

.. code-block::

pip install flask-rebar

Documentation

More extensive documentation can be found here <https://flask-rebar.readthedocs.io>_.

Extensions

Flask-Rebar is extensible! Here are some open source extensions:

  • Flask-Rebar-Auth0 <https://github.com/Sytten/flask-rebar-auth0> - Auth0 <https://auth0.com/> authenticator for Flask-Rebar

Contributing

There is still work to be done, and contributions are encouraged! Check out the contribution guide <CONTRIBUTING.rst>_ for more information.

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