Flask-KubeProxy

Middleware to fix flask-restplus swagger behavior behind kubernetes proxy.

Problem

When accessing a kubernetes service via the kubectl proxy, the path of the swagger.json file and the url's used by the 'try it out' feature are mapped without taking the context path into account. Instead of

http://localhost:xxxx/api/v1/namespaces/<namespace>/services/<service_name>/proxy/swagger.json

the swagger.json file will be fetched from

http://localhost:xxxx/swagger.json

and all requests sent out by the 'try it out' feature will use the same wrong mapping.

Fix

The Flask-KubeProxy fixes this behavior by using the HTTP_X_FORWARDED_URI header added by the proxy to set the SCRIPT_NAME variable in the WSGI environment. This variable is used by swagger to build the problematic paths. See PEP-0333.

Installation

You can pip install this package straight from this github repo by running

pip install https://github.com/ml6team/Flask-KubeProxy/archive/v0.1.zip

Usage

from flask import Flask
from flask_restplus import Api
from flask_kubeproxy.middleware import KubeProxy
 
app = Flask(__name__)
app.wsgi_app = KubeProxy(app.wsgi_app)
api = Api(app)
 
@api.route("/hello")
def hello_world():
  return "Hello, world!"