Jul 14 - Using CDN - Phase 4a

app/utils/storage.py

@@ -76,10 +76,12 @@ class LocalBackend:
     def abs_local_path(self, key):
         return os.path.normpath(os.path.join(self._static_folder(), key))
 
-    def media_url(self, key):
+    def media_url(self, key, external=False):
         if not key:
             return ''
-        return url_for('static', filename=key)
+        # external=True yields an absolute URL (scheme+host) for API responses
+        # consumed off-origin (the iPad); templates call with external=False.
+        return url_for('static', filename=key, _external=external)
 
     def read(self, key):
         with open(self.abs_local_path(key), 'rb') as fh:
@@ -164,13 +166,14 @@ class S3Backend:
         # not exist) so transition code / callers can still reference it.
         return self._local.abs_local_path(key)
 
-    def media_url(self, key):
+    def media_url(self, key, external=False):
         if not key:
             return ''
         if self.fallback and not self._head(key):
             # Object not in R2 yet — serve the local copy during transition.
             if self._local.exists(key):
-                return self._local.media_url(key)
+                return self._local.media_url(key, external=external)
+        # Presigned R2 URLs are always absolute; the external flag is moot.
         return self._client.generate_presigned_url(
             'get_object',
             Params={'Bucket': self.bucket, 'Key': key},
@@ -259,8 +262,8 @@ def save(file_obj, subfolder):
     return get_backend().save(file_obj, subfolder)
 
 
-def media_url(key):
-    return get_backend().media_url(key)
+def media_url(key, external=False):
+    return get_backend().media_url(key, external=external)
 
 
 def read(key):