FIX: Discourse.S3BaseUrl did not account for subfolder bucket names.

app/models/site_setting.rb

@@ -132,6 +132,11 @@ class SiteSetting < ActiveRecord::Base
       SiteSetting.enable_s3_uploads || GlobalSetting.use_s3?
     end
 
+    def self.s3_base_url
+      path = self.s3_upload_bucket.split("/", 2)[1]
+      "#{self.absolute_base_url}#{path ? '/' + path : ''}"
+    end
+
     def self.absolute_base_url
       bucket = SiteSetting.enable_s3_uploads ? Discourse.store.s3_bucket_name : GlobalSetting.s3_bucket_name
 

app/models/upload.rb

@@ -84,11 +84,9 @@ class Upload < ActiveRecord::Base
 
     # when using s3, we need to replace with the absolute base url
     if SiteSetting.Upload.s3_cdn_url.present?
-      path = Discourse.store.s3_bucket.split("/", 2)[1]
-
       url = url.sub(
         SiteSetting.Upload.s3_cdn_url,
-        "#{Discourse.store.absolute_base_url}#{path ? '/' + path : ''}"
+        SiteSetting.Upload.s3_base_url
       )
     end
 

app/views/common/_discourse_javascript.html.erb

@@ -58,7 +58,7 @@
       <%- if SiteSetting.Upload.s3_cdn_url.present? %>
     Discourse.S3CDN = '<%= SiteSetting.Upload.s3_cdn_url %>';
       <%- end %>
-    Discourse.S3BaseUrl = '<%= SiteSetting.Upload.absolute_base_url %>';
+    Discourse.S3BaseUrl = '<%= SiteSetting.Upload.s3_base_url %>';
     <%- end %>
   })();
 </script>