added minimal flask app

flaskapp/app.py

@@ -0,0 +1,66 @@
+from flask import Flask, request, jsonify, json
+from flask_restful import Resource, Api
+import requests
+from decouple import config
+from pyotp import TOTP
+
+app = Flask(__name__)
+api = Api(app)
+
+
+def check_otp(name, realm, token):
+    data = {
+        "auth_name": config('AUTH_NAME', ''),
+        "auth_token": TOTP(config('AUTH_SEED', '')).now(),
+        "auth_realm": config('AUTH_REALM', ''),
+        "name": name,
+        "realm": realm,
+        "token": token
+    }
+    response = requests.post(
+        "https://{OTP_SERVER}{OTP_VERIFY_ENDPOINT}".format(
+            OTP_SERVER=config('OTP_SERVER', ''),
+            OTP_VERIFY_ENDPOINT=config('OTP_VERIFY_ENDPOINT', '/ungleichotp/verify/')
+        ),
+        data=data
+    )
+    return response.status_code
+
+
+class MainView(Resource):
+    def get(self):
+        return jsonify({'Detail': 'This view is open to users'})
+
+
+class ProtectedView(Resource):
+    def post(self):
+        data = request.get_json()
+        if data is not None:
+            try:
+                user = data['name']
+                realm = data['realm']
+                token = data['token']
+                assert(realm == config('REALM_ALLOWED'))
+                code = check_otp(user, realm, token)
+                assert(code == 200)
+            except KeyError or AssertionError:
+                response = app.response_class(response=json.dumps({'Message': 'Invalid data'}),
+                                              status=400,
+                                              mimetype='application/json')
+                return response
+
+            response = app.response_class(response=json.dumps({'data sent': data}),
+                                          status=200,
+                                          mimetype='application/json')
+            return response
+        else:
+            return app.response_class(response=json.dumps({'Message': 'invalid request'}),
+                               status=400,
+                               mimetype='application/json')
+
+
+api.add_resource(MainView, '/')
+api.add_resource(ProtectedView, '/protected')
+
+if __name__ == '__main__':
+    app.run(host='0.0.0.0')