add aiohttp trailing-slash-redirect middleware

connexion/apis/aiohttp_api.py

@@ -8,6 +8,7 @@
 import aiohttp_jinja2
 from aiohttp import web
 from aiohttp.web_exceptions import HTTPNotFound
+from aiohttp.web_middlewares import normalize_path_middleware
 from connexion.apis.abstract import AbstractAPI
 from connexion.exceptions import OAuthProblem, OAuthScopeProblem
 from connexion.handlers import AuthErrorHandler
@@ -43,7 +44,10 @@ class AioHttpApi(AbstractAPI):
     def __init__(self, *args, **kwargs):
         self.subapp = web.Application(
             debug=kwargs.get('debug', False),
-            middlewares=[oauth_problem_middleware]
+            middlewares=[
+                oauth_problem_middleware,
+                normalize_path_middleware
+            ]
         )
         AbstractAPI.__init__(self, *args, **kwargs)
 
@@ -129,21 +133,30 @@ def add_swagger_ui(self):
                 self._get_swagger_ui_home
             )
 
+        # this route will match and get a permission error when trying to
+        # serve index.html, so we add the redirect below.
+        self.subapp.router.add_static(
+            console_ui_path,
+            path=str(self.options.openapi_console_ui_from_dir),
+            name='swagger_ui_static'
+        )
+
+        # we have to add an explicit redirect instead of relying on the
+        # normalize_path_middleware because we also serve static files
+        # from this dir (above)
+
         @asyncio.coroutine
         def redirect(request):
-            raise web.HTTPMovedPermanently(location=self.base_path + console_ui_path + '/')
+            raise web.HTTPMovedPermanently(
+                location=self.base_path + console_ui_path + '/'
+            )
+
         self.subapp.router.add_route(
             'GET',
             console_ui_path,
             redirect
         )
 
-        self.subapp.router.add_static(
-            console_ui_path + '/',
-            path=str(self.options.openapi_console_ui_from_dir),
-            name='swagger_ui_static'
-        )
-
     @aiohttp_jinja2.template('index.j2')
     @asyncio.coroutine
     def _get_swagger_ui_home(self, req):