Add ability for app.static() to return the routes it created. (#1954)

This allows blueprint registration to add the bp's static routes to its list of own routes. So now blueprint middlewares will apply to a blueprint's static file routes.
Fixes #1953

sanic/app.py

@@ -676,9 +676,10 @@ class Sanic:
         :param strict_slashes: Instruct :class:`Sanic` to check if the request
             URLs need to terminate with a */*
         :param content_type: user defined content type for header
-        :return: None
+        :return: routes registered on the router
+        :rtype: List[sanic.router.Route]
         """
-        static_register(
+        return static_register(
             self,
             uri,
             file_or_directory,

sanic/blueprints.py

@@ -143,7 +143,18 @@ class Blueprint:
             if _routes:
                 routes += _routes
 
+        # Static Files
+        for future in self.statics:
+            # Prepend the blueprint URI prefix if available
+            uri = url_prefix + future.uri if url_prefix else future.uri
+            _routes = app.static(
+                uri, future.file_or_directory, *future.args, **future.kwargs
+            )
+            if _routes:
+                routes += _routes
+
         route_names = [route.name for route in routes if route]
+
         # Middleware
         for future in self.middlewares:
             if future.args or future.kwargs:
@@ -160,14 +171,6 @@ class Blueprint:
         for future in self.exceptions:
             app.exception(*future.args, **future.kwargs)(future.handler)
 
-        # Static Files
-        for future in self.statics:
-            # Prepend the blueprint URI prefix if available
-            uri = url_prefix + future.uri if url_prefix else future.uri
-            app.static(
-                uri, future.file_or_directory, *future.args, **future.kwargs
-            )
-
         # Event listeners
         for event, listeners in self.listeners.items():
             for listener in listeners:

sanic/static.py

@@ -134,6 +134,8 @@ def register(
                               threshold size to switch to file_stream()
     :param name: user defined name used for url_for
     :param content_type: user defined content type for header
+    :return: registered static routes
+    :rtype: List[sanic.router.Route]
     """
     # If we're not trying to match a file directly,
     # serve from the folder
@@ -155,10 +157,11 @@ def register(
         )
     )
 
-    app.route(
+    _routes, _ = app.route(
         uri,
         methods=["GET", "HEAD"],
         name=name,
         host=host,
         strict_slashes=strict_slashes,
     )(_handler)
+    return _routes