FIX: Upload.get_from_url not respective subfolder in s3 bucket names.

app/models/upload.rb

@@ -81,8 +81,16 @@ class Upload < ActiveRecord::Base
     url = url.sub(Discourse.asset_host, "") if Discourse.asset_host.present? && Discourse.asset_host != SiteSetting.Upload.s3_cdn_url
     # when using s3 without CDN
     url = url.sub(/^https?\:/, "") if url.include?(Discourse.store.absolute_base_url) && Discourse.store.external?
+
     # when using s3, we need to replace with the absolute base url
-    url = url.sub(SiteSetting.Upload.s3_cdn_url, Discourse.store.absolute_base_url) if SiteSetting.Upload.s3_cdn_url.present?
+    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 : ''}"
+      )
+    end
 
     # always try to get the path
     uri = begin

spec/models/upload_spec.rb

@@ -93,7 +93,7 @@ describe Upload do
 
     describe "s3 store" do
       let(:path) { "/original/3X/1/0/10f73034616a796dfd70177dc54b6def44c4ba6f.png" }
-      let(:url) { "//#{SiteSetting.s3_upload_bucket}.s3.amazonaws.com#{path}" }
+      let(:url) { "#{SiteSetting.Upload.absolute_base_url}#{path}" }
 
       before do
         SiteSetting.enable_s3_uploads = true
@@ -102,23 +102,35 @@ describe Upload do
         SiteSetting.s3_secret_access_key = "some secret key"
       end
 
-      after do
-        SiteSetting.enable_s3_uploads = false
-      end
-
       it "should return the right upload when using base url (not CDN) for s3" do
         upload
-        url = "https://#{SiteSetting.s3_upload_bucket}.s3.amazonaws.com#{path}"
-
         expect(Upload.get_from_url(url)).to eq(upload)
       end
 
-      it "should return the right upload when using a CDN for s3" do
-        upload
-        s3_cdn_url = 'https://mycdn.slowly.net'
-        SiteSetting.s3_cdn_url = s3_cdn_url
+      describe 'when using a cdn' do
+        let(:s3_cdn_url) { 'https://mycdn.slowly.net' }
 
-        expect(Upload.get_from_url(URI.join(s3_cdn_url, path).to_s)).to eq(upload)
+        before do
+          SiteSetting.s3_cdn_url = s3_cdn_url
+        end
+
+        it "should return the right upload" do
+          upload
+          expect(Upload.get_from_url(URI.join(s3_cdn_url, path).to_s)).to eq(upload)
+        end
+
+        describe 'when upload bucket contains subfolder' do
+          let(:url) { "#{SiteSetting.Upload.absolute_base_url}/path/path2#{path}" }
+
+          before do
+            SiteSetting.s3_upload_bucket = "s3-upload-bucket/path/path2"
+          end
+
+          it "should return the right upload" do
+            upload
+            expect(Upload.get_from_url(URI.join(s3_cdn_url, path).to_s)).to eq(upload)
+          end
+        end
       end
 
       it "should return the right upload when using one CDN for both s3 and assets" do