Passing absolute image urls in the markdown content in the webhooks

app/models/note.rb

@@ -202,7 +202,9 @@ class Note < ActiveRecord::Base
   end
 
   def hook_attrs
-    attributes
+    attributes.merge({
+      "note" => MarkdownUtils.absolute_image_urls(self.note)
+    })
   end
 
   def for_commit?

app/models/wiki_page.rb

@@ -59,7 +59,9 @@ class WikiPage
   attr_accessor :attributes
 
   def hook_attrs
-    attributes
+    attributes.merge({
+      "content" => MarkdownUtils.absolute_image_urls(self.content)
+    })
   end
 
   def initialize(wiki, page = nil, persisted = false)

lib/gitlab/hook_data/issue_builder.rb

@@ -38,6 +38,7 @@ module Gitlab
 
       def build
         attrs = {
+          description: MarkdownUtils.absolute_image_urls(issue.description),
           url: Gitlab::UrlBuilder.build(issue),
           total_time_spent: issue.total_time_spent,
           human_total_time_spent: issue.human_total_time_spent,

lib/gitlab/hook_data/merge_request_builder.rb

@@ -43,6 +43,7 @@ module Gitlab
 
       def build
         attrs = {
+          description: MarkdownUtils.absolute_image_urls(issue.description),
           url: Gitlab::UrlBuilder.build(merge_request),
           source: merge_request.source_project.try(:hook_attrs),
           target: merge_request.target_project.hook_attrs,

lib/markdown_utils.rb

+# Class to have all utility functions related to markdown
+class MarkdownUtils
+
+  # Convert image urls in the markdown text to absolute urls
+  def self.absolute_image_urls(markdown_text)
+    markdown_text.gsub(/!\[(.*?)\]\((.*?)\)/, "![\\1](#{Settings.gitlab.url}\\2)")
+  end
+end

spec/lib/gitlab/hook_data/issue_builder_spec.rb

@@ -40,5 +40,14 @@ describe Gitlab::HookData::IssueBuilder do
       expect(data).to include(:human_total_time_spent)
       expect(data).to include(:assignee_ids)
     end
+
+    context 'when the issue has an image in the description' do
+      let(:issue_with_description) { create(:issue, description: 'test![Issue_Image](/uploads/abc/Issue_Image.png)') }
+      let(:builder) { described_class.new(issue_with_description) }
+
+      it 'adds absolute urls for images in the description' do
+        expect(data[:description]).to eq("test![Issue_Image](#{Settings.gitlab.url}/uploads/abc/Issue_Image.png)")
+      end
+    end
   end
 end

spec/models/merge_request_spec.rb

@@ -2357,4 +2357,12 @@ describe MergeRequest do
       end
     end
   end
+
+  describe '#hook_attrs' do
+    let(:mr_with_description) { create(:merge_request, description: 'test![Mr_Image](/uploads/abc/Mr_Image.png)') }
+
+    it 'adds absolute urls for images in the description' do
+      expect(mr_with_description.hook_attrs['description']).to eq("test![Mr_Image](#{Settings.gitlab.url}/uploads/abc/Mr_Image.png)")
+    end
+  end
 end

spec/models/note_spec.rb

@@ -829,4 +829,12 @@ describe Note do
       note.destroy!
     end
   end
+
+  describe '#hook_attrs' do
+    let(:note) { create(:note, note: 'test![Note_Image](/uploads/abc/Note_Image.png)') }
+
+    it 'adds absolute urls for images in the description' do
+      expect(note.hook_attrs['note']).to eq("test![Note_Image](#{Settings.gitlab.url}/uploads/abc/Note_Image.png)")
+    end
+  end
 end

spec/models/wiki_page_spec.rb

@@ -554,6 +554,18 @@ describe WikiPage do
     end
   end
 
+  describe '#hook_attrs' do
+    before do
+      create_page("test page", "test![WikiPage_Image](/uploads/abc/WikiPage_Image.png)")
+      @page = wiki.wiki.paged("test page")
+      @wiki_page = WikiPage.new(wiki, @page, true)
+    end
+
+    it 'adds absolute urls for images in the content' do
+      expect(@wiki_page.hook_attrs['content']).to eq("test![WikiPage_Image](#{Settings.gitlab.url}/uploads/abc/WikiPage_Image.png)")
+    end
+  end
+
   private
 
   def remove_temp_repo(path)