Merge branch 'image-diff' into 'master'

Fixes for showing images

- Render scrubbed SVG's inline, not via /raw/
- Use /raw/ requests on image diffs

Both of these are needed because of no longer eager loading blobs.

This a follow-up to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2830

Also see https://gitlab.com/gitlab-org/gitlab-ce/issues/13350

See merge request !2837

app/views/projects/blob/_blob.html.haml

@@ -36,7 +36,7 @@
       = render "download", blob: blob
     - elsif blob.text?
       - if blob_svg?(blob)
-        = render "image", blob: sanitize_svg(blob)
+        = render "image", blob: blob
       - else
         = render "text", blob: blob
     - elsif blob.image?

app/views/projects/blob/_image.html.haml

 .file-content.image_file
-  %img{ src: namespace_project_raw_path(@project.namespace, @project, @id)}
+  - if blob_svg?(blob)
+    - # We need to scrub SVG but we cannot do so in the RawController: it would
+    - # be wrong/strange if RawController modified the data.
+    - blob.load_all_data!(@repository)
+    - blob = sanitize_svg(blob)
+    %img{src: "data:#{blob.mime_type};base64,#{Base64.encode64(blob.data)}"}
+  - else
+    %img{src: namespace_project_raw_path(@project.namespace, @project, @id)}

app/views/projects/diffs/_image.html.haml

 - diff = diff_file.diff
-- file.load_all_data!(@project.repository)
+- file_raw_path = namespace_project_raw_path(@project.namespace, @project, tree_join(@commit.id, diff.new_path))
+- old_file_raw_path = namespace_project_raw_path(@project.namespace, @project, tree_join(@commit.parent_id, diff.old_path))
 - if diff.renamed_file || diff.new_file || diff.deleted_file
   .image
     %span.wrap
       .frame{class: image_diff_class(diff)}
-        %img{src: "data:#{file.mime_type};base64,#{Base64.encode64(file.data)}"}
+        %img{src: diff.deleted_file ? old_file_raw_path : file_raw_path}
       %p.image-info= "#{number_to_human_size file.size}"
 - else
-  - old_file.load_all_data!(@project.repository)
   .image
     %div.two-up.view
       %span.wrap
         .frame.deleted
           %a{href: namespace_project_blob_path(@project.namespace, @project, tree_join(@commit.parent_id, diff.old_path))}
-            %img{src: "data:#{old_file.mime_type};base64,#{Base64.encode64(old_file.data)}"}
+            %img{src: old_file_raw_path}
         %p.image-info.hide
           %span.meta-filesize= "#{number_to_human_size old_file.size}"
           |
@@ -25,7 +25,7 @@
       %span.wrap
         .frame.added
           %a{href: namespace_project_blob_path(@project.namespace, @project, tree_join(@commit.id, diff.new_path))}
-            %img{src: "data:#{file.mime_type};base64,#{Base64.encode64(file.data)}"}
+            %img{src: file_raw_path}
         %p.image-info.hide
           %span.meta-filesize= "#{number_to_human_size file.size}"
           |
@@ -38,10 +38,10 @@
     %div.swipe.view.hide
       .swipe-frame
         .frame.deleted
-          %img{src: "data:#{old_file.mime_type};base64,#{Base64.encode64(old_file.data)}"}
+          %img{src: old_file_raw_path}
         .swipe-wrap
           .frame.added
-            %img{src: "data:#{file.mime_type};base64,#{Base64.encode64(file.data)}"}
+            %img{src: file_raw_path}
         %span.swipe-bar
           %span.top-handle
           %span.bottom-handle
@@ -49,9 +49,9 @@
     %div.onion-skin.view.hide
       .onion-skin-frame
         .frame.deleted
-          %img{src: "data:#{old_file.mime_type};base64,#{Base64.encode64(old_file.data)}"}
+          %img{src: old_file_raw_path}
         .frame.added
-          %img{src: "data:#{file.mime_type};base64,#{Base64.encode64(file.data)}"}
+          %img{src: file_raw_path}
         .controls
           .transparent
           .drag-track