Feature for #16654, embedded audio elements in markdown.

app/assets/javascripts/behaviors/markdown/editor_extensions.js

@@ -21,6 +21,7 @@ import Reference from './nodes/reference';
 
 import TableOfContents from './nodes/table_of_contents';
 import Video from './nodes/video';
+import Audio from './nodes/audio';
 
 import BulletList from './nodes/bullet_list';
 import OrderedList from './nodes/ordered_list';
@@ -78,6 +79,7 @@ export default [
 
   new TableOfContents(),
   new Video(),
+  new Audio(),
 
   new BulletList(),
   new OrderedList(),

app/assets/javascripts/behaviors/markdown/nodes/audio.js

+/* eslint-disable class-methods-use-this */
+
+import { Node } from 'tiptap';
+import { defaultMarkdownSerializer } from 'prosemirror-markdown';
+
+// Transforms generated HTML back to GFM for Banzai::Filter::AudioLinkFilter
+export default class Audio extends Node {
+  get name() {
+    return 'audio';
+  }
+
+  get schema() {
+    return {
+      attrs: {
+        src: {},
+        alt: {
+          default: null,
+        },
+      },
+      group: 'block',
+      draggable: true,
+      parseDOM: [
+        {
+          tag: '.audio-container',
+          skip: true,
+        },
+        {
+          tag: '.audio-container p',
+          priority: 51,
+          ignore: true,
+        },
+        {
+          tag: 'audio[src]',
+          getAttrs: el => ({ src: el.getAttribute('src'), alt: el.dataset.title }),
+        },
+      ],
+      toDOM: node => [
+        'audio',
+        {
+          src: node.attrs.src,
+          controls: true,
+          'data-setup': '{}',
+          'data-title': node.attrs.alt,
+        },
+      ],
+    };
+  }
+
+  toMarkdown(state, node) {
+    defaultMarkdownSerializer.nodes.image(state, node);
+    state.closeBlock(node);
+  }
+}

app/controllers/concerns/uploads_actions.rb

@@ -37,7 +37,7 @@ module UploadsActions
       expires_in 0.seconds, must_revalidate: true, private: true
     end
 
-    disposition = uploader.image_or_video? ? 'inline' : 'attachment'
+    disposition = uploader.embeddable? ? 'inline' : 'attachment'
 
     uploaders = [uploader, *uploader.versions.values]
     uploader = uploaders.find { |version| version.filename == params[:filename] }
@@ -112,8 +112,8 @@ module UploadsActions
     uploader
   end
 
-  def image_or_video?
-    uploader && uploader.exists? && uploader.image_or_video?
+  def embeddable?
+    uploader && uploader.exists? && uploader.embeddable?
   end
 
   def find_model

app/controllers/groups/uploads_controller.rb

@@ -4,7 +4,7 @@ class Groups::UploadsController < Groups::ApplicationController
   include UploadsActions
   include WorkhorseRequest
 
-  skip_before_action :group, if: -> { action_name == 'show' && image_or_video? }
+  skip_before_action :group, if: -> { action_name == 'show' && embeddable? }
 
   before_action :authorize_upload_file!, only: [:create, :authorize]
   before_action :verify_workhorse_api!, only: [:authorize]

app/controllers/help_controller.rb

@@ -40,8 +40,8 @@ class HelpController < ApplicationController
         end
       end
 
-      # Allow access to images in the doc folder
-      format.any(:png, :gif, :jpeg, :mp4) do
+      # Allow access to specific media files in the doc folder
+      format.any(:png, :gif, :jpeg, :mp4, :mp3) do
         # Note: We are purposefully NOT using `Rails.root.join`
         path = File.join(Rails.root, 'doc', "#{@path}.#{params[:format]}")
 

app/controllers/projects/uploads_controller.rb

@@ -6,7 +6,7 @@ class Projects::UploadsController < Projects::ApplicationController
 
   # These will kick you out if you don't have access.
   skip_before_action :project, :repository,
-    if: -> { action_name == 'show' && image_or_video? }
+    if: -> { action_name == 'show' && embeddable? }
 
   before_action :authorize_upload_file!, only: [:create, :authorize]
   before_action :verify_workhorse_api!, only: [:authorize]

app/models/blob.rb

@@ -179,6 +179,10 @@ class Blob < SimpleDelegator
     UploaderHelper::SAFE_VIDEO_EXT.include?(extension)
   end
 
+  def audio?
+    UploaderHelper::SAFE_AUDIO_EXT.include?(extension)
+  end
+
   def readable_text?
     text_in_repo? && !stored_externally? && !truncated?
   end

app/models/commit.rb

@@ -415,7 +415,7 @@ class Commit
 
     if entry[:type] == :blob
       blob = ::Blob.decorate(Gitlab::Git::Blob.new(name: entry[:name]), @project)
-      blob.image? || blob.video? ? :raw : :blob
+      blob.image? || blob.video? || blob.audio? ? :raw : :blob
     else
       entry[:type]
     end

changelogs/unreleased/16654-audio-in-markdown.yml

+---
+title: Feature enabling embedded audio elements in markdown.
+merge_request: 17860
+author: Jesse Hall @jessehall3
+type: added

doc/security/asset_proxy.md

@@ -11,12 +11,12 @@ to log the IP address of the user.
 One way to mitigate this is by proxying any external images to a server you
 control.
 
-GitLab can be configured to use an asset proxy server when requesting external images/videos in
+GitLab can be configured to use an asset proxy server when requesting external images/videos/audio in
 issues, comments, etc. This helps ensure that malicious images do not expose the user's IP address
 when they are fetched.
 
 We currently recommend using [cactus/go-camo](https://github.com/cactus/go-camo#how-it-works)
-as it supports proxying video and is more configurable.
+as it supports proxying video, audio, and is more configurable.
 
 ## Installing Camo server
 
@@ -52,7 +52,7 @@ To install a Camo server as an asset proxy:
 
 ## Using the Camo server
 
-Once the Camo server is running and you've enabled the GitLab settings, any image or video that
+Once the Camo server is running and you've enabled the GitLab settings, any image, video, or audio that
 references an external source will get proxied to the Camo server.
 
 For example, the following is a link to an image in Markdown:

doc/user/markdown.md

@@ -108,7 +108,7 @@ changing how standard markdown is used:
 | [code blocks](#code-spans-and-blocks) | [colored code and syntax highlighting](#colored-code-and-syntax-highlighting) |
 | [emphasis](#emphasis)                 | [multiple underscores in words](#multiple-underscores-in-words-and-mid-word-emphasis)
 | [headers](#headers)                   | [linkable Header IDs](#header-ids-and-links) |
-| [images](#images)                     | [embedded videos](#videos) |
+| [images](#images)                     | [embedded videos](#videos) and [audio](#audio) |
 | [linebreaks](#line-breaks)            | [more linebreak control](#newlines) |
 | [links](#links)                       | [automatically linking URLs](#url-auto-linking) |
 
@@ -899,6 +899,23 @@ Here's a sample video:
 
 ![Sample Video](img/markdown_video.mp4)
 
+#### Audio
+
+> If this is not rendered correctly, [view it in GitLab itself](https://gitlab.com/gitlab-org/gitlab/blob/master/doc/user/markdown.md#audio).
+
+Similar to videos, link tags for files with an audio extension are automatically converted to
+an audio player. The valid audio extensions are `.mp3`, `.ogg`, and `.wav`:
+
+```md
+Here's a sample audio clip:
+
+![Sample Audio](img/markdown_audio.mp3)
+```
+
+Here's a sample audio clip:
+
+![Sample Audio](img/markdown_audio.mp3)
+
 ### Inline HTML
 
 > To see the markdown rendered within HTML in the second example, [view it in GitLab itself](https://gitlab.com/gitlab-org/gitlab/blob/master/doc/user/markdown.md#inline-html).

lib/banzai/filter/audio_link_filter.rb

+# frozen_string_literal: true
+
+# Generated HTML is transformed back to GFM by app/assets/javascripts/behaviors/markdown/nodes/audio.js
+module Banzai
+  module Filter
+    # Find every image that isn't already wrapped in an `a` tag, and that has
+    # a `src` attribute ending with an audio extension, add a new audio node and
+    # a "Download" link in the case the audio cannot be played.
+    class AudioLinkFilter < HTML::Pipeline::Filter
+      def call
+        doc.xpath('descendant-or-self::img[not(ancestor::a)]').each do |el|
+          el.replace(audio_node(doc, el)) if has_audio_extension?(el)
+        end
+
+        doc
+      end
+
+      private
+
+      def has_audio_extension?(element)
+        src = element.attr('data-canonical-src').presence || element.attr('src')
+
+        return unless src.present?
+
+        src_ext = File.extname(src).sub('.', '').downcase
+        Gitlab::FileTypeDetection::SAFE_AUDIO_EXT.include?(src_ext)
+      end
+
+      def audio_node(doc, element)
+        container = doc.document.create_element(
+          'div',
+          class: 'audio-container'
+        )
+
+        audio = doc.document.create_element(
+          'audio',
+          src: element['src'],
+          controls: true,
+          'data-setup' => '{}',
+          'data-title' => element['title'] || element['alt'])
+
+        link = doc.document.create_element(
+          'a',
+          element['title'] || element['alt'],
+          href: element['src'],
+          target: '_blank',
+          rel: 'noopener noreferrer',
+          title: "Download '#{element['title'] || element['alt']}'")
+
+        # make sure the original non-proxied src carries over
+        if element['data-canonical-src']
+          audio['data-canonical-src'] = element['data-canonical-src']
+          link['data-canonical-src']  = element['data-canonical-src']
+        end
+
+        download_paragraph = doc.document.create_element('p')
+        download_paragraph.children = link
+
+        container.add_child(audio)
+        container.add_child(download_paragraph)
+
+        container
+      end
+    end
+  end
+end

lib/banzai/filter/relative_link_filter.rb

@@ -65,7 +65,7 @@ module Banzai
             el.attribute('href')
           end
 
-          attrs += doc.search('img, video').flat_map do |el|
+          attrs += doc.search('img, video, audio').flat_map do |el|
             [el.attribute('src'), el.attribute('data-src')]
           end
 
@@ -83,7 +83,7 @@ module Banzai
         get_blob_types(paths).each do |name, type|
           if type == :blob
             blob = ::Blob.decorate(Gitlab::Git::Blob.new(name: name), project)
-            uri_types[name] = blob.image? || blob.video? ? :raw : :blob
+            uri_types[name] = blob.image? || blob.video? || blob.audio? ? :raw : :blob
           else
             uri_types[name] = type
           end

lib/banzai/filter/wiki_link_filter.rb

@@ -15,7 +15,7 @@ module Banzai
 
         doc.search('a:not(.gfm)').each { |el| process_link(el.attribute('href'), el) }
 
-        doc.search('video').each { |el| process_link(el.attribute('src'), el) }
+        doc.search('video, audio').each { |el| process_link(el.attribute('src'), el) }
 
         doc.search('img').each do |el|
           attr = el.attribute('data-src') || el.attribute('src')

lib/banzai/pipeline/gfm_pipeline.rb

@@ -26,6 +26,7 @@ module Banzai
           Filter::ColorFilter,
           Filter::MermaidFilter,
           Filter::VideoLinkFilter,
+          Filter::AudioLinkFilter,
           Filter::ImageLazyLoadFilter,
           Filter::ImageLinkFilter,
           Filter::InlineMetricsFilter,

lib/gitlab/file_markdown_link_builder.rb

@@ -10,14 +10,14 @@ module Gitlab
       return unless name = markdown_name
 
       markdown = "[#{name.gsub(']', '\\]')}](#{secure_url})"
-      markdown = "!#{markdown}" if image_or_video? || dangerous_image_or_video?
+      markdown = "!#{markdown}" if embeddable? || dangerous_embeddable?
       markdown
     end
 
     def markdown_name
       return unless filename.present?
 
-      image_or_video? ? File.basename(filename, File.extname(filename)) : filename
+      embeddable? ? File.basename(filename, File.extname(filename)) : filename
     end
   end
 end

lib/gitlab/file_type_detection.rb

@@ -26,11 +26,13 @@ module Gitlab
     # on IE >= 9.
     # http://archive.sublimevideo.info/20150912/docs.sublimevideo.net/troubleshooting.html
     SAFE_VIDEO_EXT = %w[mp4 m4v mov webm ogv].freeze
+    SAFE_AUDIO_EXT = %w[mp3 oga ogg spx wav].freeze
 
     # These extension types can contain dangerous code and should only be embedded inline with
     # proper filtering. They should always be tagged as "Content-Disposition: attachment", not "inline".
     DANGEROUS_IMAGE_EXT = %w[svg].freeze
     DANGEROUS_VIDEO_EXT = [].freeze # None, yet
+    DANGEROUS_AUDIO_EXT = [].freeze # None, yet
 
     def image?
       extension_match?(SAFE_IMAGE_EXT)
@@ -40,8 +42,12 @@ module Gitlab
       extension_match?(SAFE_VIDEO_EXT)
     end
 
-    def image_or_video?
-      image? || video?
+    def audio?
+      extension_match?(SAFE_AUDIO_EXT)
+    end
+
+    def embeddable?
+      image? || video? || audio?
     end
 
     def dangerous_image?
@@ -52,8 +58,12 @@ module Gitlab
       extension_match?(DANGEROUS_VIDEO_EXT)
     end
 
-    def dangerous_image_or_video?
-      dangerous_image? || dangerous_video?
+    def dangerous_audio?
+      extension_match?(DANGEROUS_AUDIO_EXT)
+    end
+
+    def dangerous_embeddable?
+      dangerous_image? || dangerous_video? || dangerous_audio?
     end
 
     private

spec/features/markdown/copy_as_gfm_spec.rb

@@ -178,6 +178,12 @@ describe 'Copy as GFM', :js do
         '![Video](https://example.com/video.mp4)'
       )
 
+      verify(
+        'AudioLinkFilter',
+
+        '![Audio](https://example.com/audio.wav)'
+      )
+
       verify(
         'MathFilter: math as converted from GFM to HTML',
 

spec/features/markdown/markdown_spec.rb

@@ -320,6 +320,10 @@ describe 'GitLab Markdown', :aggregate_failures do
         expect(doc).to parse_video_links
       end
 
+      aggregate_failures 'AudioLinkFilter' do
+        expect(doc).to parse_audio_links
+      end
+
       aggregate_failures 'ColorFilter' do
         expect(doc).to parse_colors
       end

spec/features/projects/branches_spec.rb

@@ -101,7 +101,7 @@ describe 'Branches' do
         visit project_branches_filtered_path(project, state: 'all')
 
         expect(all('.all-branches').last).to have_selector('li', count: 20)
-        accept_confirm { find('.js-branch-add-pdf-text-binary .btn-remove').click }
+        accept_confirm { find('.js-branch-invalid-utf8-diff-paths .btn-remove').click }
 
         expect(all('.all-branches').last).to have_selector('li', count: 19)
       end

spec/fixtures/markdown.md.erb

@@ -286,6 +286,10 @@ However the wrapping tags cannot be mixed as such:
 
 ![My Video](/assets/videos/gitlab-demo.mp4)
 
+### Audio
+
+![My Audio Clip](/assets/audio/gitlab-demo.wav)
+
 ### Colors
 
 `#F00`  

spec/lib/banzai/filter/audio_link_filter_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Banzai::Filter::AudioLinkFilter do
+  def filter(doc, contexts = {})
+    contexts.reverse_merge!({
+      project: project
+    })
+
+    described_class.call(doc, contexts)
+  end
+
+  def link_to_image(path)
+    return '<img/>' if path.nil?
+
+    %(<img src="#{path}"/>)
+  end
+
+  let(:project) { create(:project, :repository) }
+
+  shared_examples 'an audio element' do
+    let(:image) { link_to_image(src) }
+
+    it 'replaces the image tag with an audio tag' do
+      container = filter(image).children.first
+
+      expect(container.name).to eq 'div'
+      expect(container['class']).to eq 'audio-container'
+
+      audio, paragraph = container.children
+
+      expect(audio.name).to eq 'audio'
+      expect(audio['src']).to eq src
+
+      expect(paragraph.name).to eq 'p'
+
+      link = paragraph.children.first
+
+      expect(link.name).to eq 'a'
+      expect(link['href']).to eq src
+      expect(link['target']).to eq '_blank'
+    end
+  end
+
+  shared_examples 'an unchanged element' do |ext|
+    it 'leaves the document unchanged' do
+      element = filter(link_to_image(src)).children.first
+
+      expect(element.name).to eq 'img'
+      expect(element['src']).to eq src
+    end
+  end
+
+  context 'when the element src has an audio extension' do
+    Gitlab::FileTypeDetection::SAFE_AUDIO_EXT.each do |ext|
+      it_behaves_like 'an audio element' do
+        let(:src) { "/path/audio.#{ext}" }
+      end
+
+      it_behaves_like 'an audio element' do
+        let(:src) { "/path/audio.#{ext.upcase}" }
+      end
+    end
+  end
+
+  context 'when the element has no src attribute' do
+    let(:src) { nil }
+
+    it_behaves_like 'an unchanged element'
+  end
+
+  context 'when the element src is an image' do
+    let(:src) { '/path/my_image.jpg' }
+
+    it_behaves_like 'an unchanged element'
+  end
+
+  context 'when the element src has an invalid file extension' do
+    let(:src) { '/path/my_audio.somewav' }
+
+    it_behaves_like 'an unchanged element'
+  end
+
+  context 'when data-canonical-src is empty' do
+    let(:image) { %(<img src="#{src}" data-canonical-src=""/>) }
+
+    context 'and src is audio' do
+      let(:src) { '/path/audio.wav' }
+
+      it_behaves_like 'an audio element'
+    end
+
+    context 'and src is an image' do
+      let(:src) { '/path/my_image.jpg' }
+
+      it_behaves_like 'an unchanged element'
+    end
+  end
+
+  context 'when data-canonical-src is set' do
+    it 'uses the correct src' do
+      proxy_src = 'https://assets.example.com/6d8b63'
+      canonical_src = 'http://example.com/test.wav'
+      image = %(<img src="#{proxy_src}" data-canonical-src="#{canonical_src}"/>)
+      container = filter(image).children.first
+
+      expect(container['class']).to eq 'audio-container'
+
+      audio, paragraph = container.children
+
+      expect(audio['src']).to eq proxy_src
+      expect(audio['data-canonical-src']).to eq canonical_src
+
+      link = paragraph.children.first
+
+      expect(link['href']).to eq proxy_src
+    end
+  end
+end

spec/lib/banzai/filter/relative_link_filter_spec.rb

@@ -29,6 +29,10 @@ describe Banzai::Filter::RelativeLinkFilter do
     %(<video src="#{path}"></video>)
   end
 
+  def audio(path)
+    %(<audio src="#{path}"></audio>)
+  end
+
   def link(path)
     %(<a href="#{path}">#{path}</a>)
   end
@@ -82,6 +86,12 @@ describe Banzai::Filter::RelativeLinkFilter do
 
       expect(doc.at_css('video')['src']).to eq 'files/videos/intro.mp4'
     end
+
+    it 'does not modify any relative URL in audio' do
+      doc = filter(audio('files/audio/sample.wav'), commit: project.commit('audio'), ref: 'audio')
+
+      expect(doc.at_css('audio')['src']).to eq 'files/audio/sample.wav'
+    end
   end
 
   context 'with a project_wiki' do
@@ -218,6 +228,13 @@ describe Banzai::Filter::RelativeLinkFilter do
         .to eq "/#{project_path}/raw/video/files/videos/intro.mp4"
     end
 
+    it 'rebuilds relative URL for audio in the repo' do
+      doc = filter(audio('files/audio/sample.wav'), commit: project.commit('audio'), ref: 'audio')
+
+      expect(doc.at_css('audio')['src'])
+        .to eq "/#{project_path}/raw/audio/files/audio/sample.wav"
+    end
+
     it 'does not modify relative URL with an anchor only' do
       doc = filter(link('#section-1'))
       expect(doc.at_css('a')['href']).to eq '#section-1'

spec/lib/banzai/filter/wiki_link_filter_spec.rb

@@ -60,6 +60,14 @@ describe Banzai::Filter::WikiLinkFilter do
         expect(filtered_link.attribute('src').value).to eq("#{wiki.wiki_base_path}/#{repository_upload_folder}/a.mp4")
       end
     end
+
+    context 'with "audio" html tag' do
+      it 'rewrites links' do
+        filtered_link = filter("<audio src='#{repository_upload_folder}/a.wav'></audio>", project_wiki: wiki).children[0]
+
+        expect(filtered_link.attribute('src').value).to eq("#{wiki.wiki_base_path}/#{repository_upload_folder}/a.wav")
+      end
+    end
   end
 
   describe "invalid links" do

spec/lib/banzai/pipeline/wiki_pipeline_spec.rb

@@ -260,11 +260,11 @@ describe Banzai::Pipeline::WikiPipeline do
     end
   end
 
-  describe 'videos' do
-    let(:namespace) { create(:namespace, name: "wiki_link_ns") }
-    let(:project)   { create(:project, :public, name: "wiki_link_project", namespace: namespace) }
-    let(:project_wiki) { ProjectWiki.new(project, double(:user)) }
-    let(:page) { build(:wiki_page, wiki: project_wiki, page: OpenStruct.new(url_path: 'nested/twice/start-page')) }
+  describe 'videos and audio' do
+    let_it_be(:namespace) { create(:namespace, name: "wiki_link_ns") }
+    let_it_be(:project)   { create(:project, :public, name: "wiki_link_project", namespace: namespace) }
+    let_it_be(:project_wiki) { ProjectWiki.new(project, double(:user)) }
+    let_it_be(:page) { build(:wiki_page, wiki: project_wiki, page: OpenStruct.new(url_path: 'nested/twice/start-page')) }
 
     it 'generates video html structure' do
       markdown = "![video_file](video_file_name.mp4)"
@@ -279,5 +279,19 @@ describe Banzai::Pipeline::WikiPipeline do
 
       expect(output).to include('<video src="/wiki_link_ns/wiki_link_project/wikis/nested/twice/video%20file%20name.mp4"')
     end
+
+    it 'generates audio html structure' do
+      markdown = "![audio_file](audio_file_name.wav)"
+      output = described_class.to_html(markdown, project: project, project_wiki: project_wiki, page_slug: page.slug)
+
+      expect(output).to include('<audio src="/wiki_link_ns/wiki_link_project/wikis/nested/twice/audio_file_name.wav"')
+    end
+
+    it 'rewrites and replaces audio links names with white spaces to %20' do
+      markdown = "![audio file](audio file name.wav)"
+      output = described_class.to_html(markdown, project: project, project_wiki: project_wiki, page_slug: page.slug)
+
+      expect(output).to include('<audio src="/wiki_link_ns/wiki_link_project/wikis/nested/twice/audio%20file%20name.wav"')
+    end
   end
 end

spec/lib/gitlab/file_markdown_link_builder_spec.rb

@@ -27,19 +27,35 @@ describe Gitlab::FileMarkdownLinkBuilder do
       end
     end
 
-    context 'when file is an image or video' do
-      let(:filename) { 'dk.png' }
+    context 'when file is an image' do
+      let(:filename) { 'my_image.png' }
 
       it 'returns preview markdown link' do
-        expect(custom_class.markdown_link).to eq '![dk](/uploads/dk.png)'
+        expect(custom_class.markdown_link).to eq '![my_image](/uploads/my_image.png)'
       end
     end
 
-    context 'when file is not an image or video' do
-      let(:filename) { 'dk.zip' }
+    context 'when file is video' do
+      let(:filename) { 'my_video.mp4' }
+
+      it 'returns preview markdown link' do
+        expect(custom_class.markdown_link).to eq '![my_video](/uploads/my_video.mp4)'
+      end
+    end
+
+    context 'when file is audio' do
+      let(:filename) { 'my_audio.wav' }
+
+      it 'returns preview markdown link' do
+        expect(custom_class.markdown_link).to eq '![my_audio](/uploads/my_audio.wav)'
+      end
+    end
+
+    context 'when file is not embeddable' do
+      let(:filename) { 'my_zip.zip' }
 
       it 'returns markdown link' do
-        expect(custom_class.markdown_link).to eq '[dk.zip](/uploads/dk.zip)'
+        expect(custom_class.markdown_link).to eq '[my_zip.zip](/uploads/my_zip.zip)'
       end
     end
 
@@ -53,19 +69,35 @@ describe Gitlab::FileMarkdownLinkBuilder do
   end
 
   describe 'mardown_name' do
-    context 'when file is an image or video' do
-      let(:filename) { 'dk.png' }
+    context 'when file is an image' do
+      let(:filename) { 'my_image.png' }
+
+      it 'retrieves the name without the extension' do
+        expect(custom_class.markdown_name).to eq 'my_image'
+      end
+    end
+
+    context 'when file is video' do
+      let(:filename) { 'my_video.mp4' }
+
+      it 'retrieves the name without the extension' do
+        expect(custom_class.markdown_name).to eq 'my_video'
+      end
+    end
+
+    context 'when file is audio' do
+      let(:filename) { 'my_audio.wav' }
 
       it 'retrieves the name without the extension' do
-        expect(custom_class.markdown_name).to eq 'dk'
+        expect(custom_class.markdown_name).to eq 'my_audio'
       end
     end
 
-    context 'when file is not an image or video' do
-      let(:filename) { 'dk.zip' }
+    context 'when file is not embeddable' do
+      let(:filename) { 'my_zip.zip' }
 
       it 'retrieves the name with the extesion' do
-        expect(custom_class.markdown_name).to eq 'dk.zip'
+        expect(custom_class.markdown_name).to eq 'my_zip.zip'
       end
     end
 

spec/lib/gitlab/file_type_detection_spec.rb

@@ -3,7 +3,21 @@ require 'spec_helper'
 
 describe Gitlab::FileTypeDetection do
   context 'when class is an uploader' do
-    shared_examples '#image? for an uploader' do
+    let(:uploader) do
+      example_uploader = Class.new(CarrierWave::Uploader::Base) do
+        include Gitlab::FileTypeDetection
+
+        storage :file
+      end
+
+      example_uploader.new
+    end
+
+    def upload_fixture(filename)
+      fixture_file_upload(File.join('spec', 'fixtures', filename))
+    end
+
+    describe '#image?' do
       it 'returns true for an image file' do
         uploader.store!(upload_fixture('dk.png'))
 
@@ -23,6 +37,12 @@ describe Gitlab::FileTypeDetection do
         expect(uploader).not_to be_image
       end
 
+      it 'returns false for an audio file' do
+        uploader.store!(upload_fixture('audio_sample.wav'))
+
+        expect(uploader).not_to be_image
+      end
+
       it 'returns false if filename is blank' do
         uploader.store!(upload_fixture('dk.png'))
 
@@ -32,7 +52,7 @@ describe Gitlab::FileTypeDetection do
       end
     end
 
-    shared_examples '#video? for an uploader' do
+    describe '#video?' do
       it 'returns true for a video file' do
         uploader.store!(upload_fixture('video_sample.mp4'))
 
@@ -45,8 +65,21 @@ describe Gitlab::FileTypeDetection do
         expect(uploader).not_to be_video
       end
 
+      it 'returns false for an audio file' do
+        uploader.store!(upload_fixture('audio_sample.wav'))
+
+        expect(uploader).not_to be_video
+      end
+
+      it 'returns false if file has a dangerous image extension' do
+        uploader.store!(upload_fixture('unsanitized.svg'))
+
+        expect(uploader).to be_dangerous_image
+        expect(uploader).not_to be_video
+      end
+
       it 'returns false if filename is blank' do
-        uploader.store!(upload_fixture('dk.png'))
+        uploader.store!(upload_fixture('video_sample.mp4'))
 
         allow(uploader).to receive(:filename).and_return(nil)
 
@@ -54,7 +87,83 @@ describe Gitlab::FileTypeDetection do
       end
     end
 
-    shared_examples '#dangerous_image? for an uploader' do
+    describe '#audio?' do
+      it 'returns true for an audio file' do
+        uploader.store!(upload_fixture('audio_sample.wav'))
+
+        expect(uploader).to be_audio
+      end
+
+      it 'returns false for an image file' do
+        uploader.store!(upload_fixture('dk.png'))
+
+        expect(uploader).not_to be_audio
+      end
+
+      it 'returns false for a video file' do
+        uploader.store!(upload_fixture('video_sample.mp4'))
+
+        expect(uploader).not_to be_audio
+      end
+
+      it 'returns false if file has a dangerous image extension' do
+        uploader.store!(upload_fixture('unsanitized.svg'))
+
+        expect(uploader).to be_dangerous_image
+        expect(uploader).not_to be_audio
+      end
+
+      it 'returns false if filename is blank' do
+        uploader.store!(upload_fixture('audio_sample.wav'))
+
+        allow(uploader).to receive(:filename).and_return(nil)
+
+        expect(uploader).not_to be_audio
+      end
+    end
+
+    describe '#embeddable?' do
+      it 'returns true for an image file' do
+        uploader.store!(upload_fixture('dk.png'))
+
+        expect(uploader).to be_embeddable
+      end
+
+      it 'returns true for a video file' do
+        uploader.store!(upload_fixture('video_sample.mp4'))
+
+        expect(uploader).to be_embeddable
+      end
+
+      it 'returns true for an audio file' do
+        uploader.store!(upload_fixture('audio_sample.wav'))
+
+        expect(uploader).to be_embeddable
+      end
+
+      it 'returns false if not an embeddable file' do
+        uploader.store!(upload_fixture('doc_sample.txt'))
+
+        expect(uploader).not_to be_embeddable
+      end
+
+      it 'returns false if filename has a dangerous image extension' do
+        uploader.store!(upload_fixture('unsanitized.svg'))
+
+        expect(uploader).to be_dangerous_image
+        expect(uploader).not_to be_embeddable
+      end
+
+      it 'returns false if filename is blank' do
+        uploader.store!(upload_fixture('dk.png'))
+
+        allow(uploader).to receive(:filename).and_return(nil)
+
+        expect(uploader).not_to be_embeddable
+      end
+    end
+
+    describe '#dangerous_image?' do
       it 'returns true if filename has a dangerous extension' do
         uploader.store!(upload_fixture('unsanitized.svg'))
 
@@ -73,6 +182,12 @@ describe Gitlab::FileTypeDetection do
         expect(uploader).not_to be_dangerous_image
       end
 
+      it 'returns false for an audio file' do
+        uploader.store!(upload_fixture('audio_sample.wav'))
+
+        expect(uploader).not_to be_dangerous_image
+      end
+
       it 'returns false if filename is blank' do
         uploader.store!(upload_fixture('dk.png'))
 
@@ -82,7 +197,7 @@ describe Gitlab::FileTypeDetection do
       end
     end
 
-    shared_examples '#dangerous_video? for an uploader' do
+    describe '#dangerous_video?' do
       it 'returns false for a safe video file' do
         uploader.store!(upload_fixture('video_sample.mp4'))
 
@@ -101,6 +216,12 @@ describe Gitlab::FileTypeDetection do
         expect(uploader).not_to be_dangerous_video
       end
 
+      it 'returns false for an audio file' do
+        uploader.store!(upload_fixture('audio_sample.wav'))
+
+        expect(uploader).not_to be_dangerous_video
+      end
+
       it 'returns false if filename is blank' do
         uploader.store!(upload_fixture('dk.png'))
 
@@ -110,49 +231,91 @@ describe Gitlab::FileTypeDetection do
       end
     end
 
-    let(:uploader) do
-      example_uploader = Class.new(CarrierWave::Uploader::Base) do
-        include Gitlab::FileTypeDetection
+    describe '#dangerous_audio?' do
+      it 'returns false for a safe audio file' do
+        uploader.store!(upload_fixture('audio_sample.wav'))
 
-        storage :file
+        expect(uploader).not_to be_dangerous_audio
       end
 
-      example_uploader.new
-    end
+      it 'returns false if filename is a dangerous image extension' do
+        uploader.store!(upload_fixture('unsanitized.svg'))
 
-    def upload_fixture(filename)
-      fixture_file_upload(File.join('spec', 'fixtures', filename))
-    end
+        expect(uploader).not_to be_dangerous_audio
+      end
 
-    describe '#image?' do
-      include_examples '#image? for an uploader'
-    end
+      it 'returns false for an image file' do
+        uploader.store!(upload_fixture('dk.png'))
 
-    describe '#video?' do
-      include_examples '#video? for an uploader'
-    end
+        expect(uploader).not_to be_dangerous_audio
+      end
 
-    describe '#image_or_video?' do
-      include_examples '#image? for an uploader'
-      include_examples '#video? for an uploader'
-    end
+      it 'returns false for an video file' do
+        uploader.store!(upload_fixture('video_sample.mp4'))
 
-    describe '#dangerous_image?' do
-      include_examples '#dangerous_image? for an uploader'
-    end
+        expect(uploader).not_to be_dangerous_audio
+      end
 
-    describe '#dangerous_video?' do
-      include_examples '#dangerous_video? for an uploader'
+      it 'returns false if filename is blank' do
+        uploader.store!(upload_fixture('dk.png'))
+
+        allow(uploader).to receive(:filename).and_return(nil)
+
+        expect(uploader).not_to be_dangerous_audio
+      end
     end
 
-    describe '#dangerous_image_or_video?' do
-      include_examples '#dangerous_image? for an uploader'
-      include_examples '#dangerous_video? for an uploader'
+    describe '#dangerous_embeddable?' do
+      it 'returns true if filename has a dangerous image extension' do
+        uploader.store!(upload_fixture('unsanitized.svg'))
+
+        expect(uploader).to be_dangerous_embeddable
+      end
+
+      it 'returns false for an image file' do
+        uploader.store!(upload_fixture('dk.png'))
+
+        expect(uploader).not_to be_dangerous_embeddable
+      end
+
+      it 'returns false for a video file' do
+        uploader.store!(upload_fixture('video_sample.mp4'))
+
+        expect(uploader).not_to be_dangerous_embeddable
+      end
+
+      it 'returns false for an audio file' do
+        uploader.store!(upload_fixture('audio_sample.wav'))
+
+        expect(uploader).not_to be_dangerous_embeddable
+      end
+
+      it 'returns false for a non-embeddable file' do
+        uploader.store!(upload_fixture('doc_sample.txt'))
+
+        expect(uploader).not_to be_dangerous_embeddable
+      end
+
+      it 'returns false if filename is blank' do
+        uploader.store!(upload_fixture('dk.png'))
+
+        allow(uploader).to receive(:filename).and_return(nil)
+
+        expect(uploader).not_to be_dangerous_embeddable
+      end
     end
   end
 
   context 'when class is a regular class' do
-    shared_examples '#image? for a regular class' do
+    let(:custom_class) do
+      custom_class = Class.new do
+        include Gitlab::FileTypeDetection
+      end
+
+      custom_class.new
+    end
+
+    describe '#image?' do
       it 'returns true for an image file' do
         allow(custom_class).to receive(:filename).and_return('dk.png')
 
@@ -166,12 +329,18 @@ describe Gitlab::FileTypeDetection do
         expect(custom_class).not_to be_image
       end
 
-      it 'returns false for any non image file' do
+      it 'returns false for a video file' do
         allow(custom_class).to receive(:filename).and_return('video_sample.mp4')
 
         expect(custom_class).not_to be_image
       end
 
+      it 'returns false for an audio file' do
+        allow(custom_class).to receive(:filename).and_return('audio_sample.wav')
+
+        expect(custom_class).not_to be_image
+      end
+
       it 'returns false if filename is blank' do
         allow(custom_class).to receive(:filename).and_return(nil)
 
@@ -179,19 +348,25 @@ describe Gitlab::FileTypeDetection do
       end
     end
 
-    shared_examples '#video? for a regular class' do
+    describe '#video?' do
       it 'returns true for a video file' do
         allow(custom_class).to receive(:filename).and_return('video_sample.mp4')
 
         expect(custom_class).to be_video
       end
 
-      it 'returns false for any non-video file' do
+      it 'returns false for an image file' do
         allow(custom_class).to receive(:filename).and_return('dk.png')
 
         expect(custom_class).not_to be_video
       end
 
+      it 'returns false for an audio file' do
+        allow(custom_class).to receive(:filename).and_return('audio_sample.wav')
+
+        expect(custom_class).not_to be_video
+      end
+
       it 'returns false if file has a dangerous image extension' do
         allow(custom_class).to receive(:filename).and_return('unsanitized.svg')
 
@@ -206,7 +381,79 @@ describe Gitlab::FileTypeDetection do
       end
     end
 
-    shared_examples '#dangerous_image? for a regular class' do
+    describe '#audio?' do
+      it 'returns true for an audio file' do
+        allow(custom_class).to receive(:filename).and_return('audio_sample.wav')
+
+        expect(custom_class).to be_audio
+      end
+
+      it 'returns false for an image file' do
+        allow(custom_class).to receive(:filename).and_return('dk.png')
+
+        expect(custom_class).not_to be_audio
+      end
+
+      it 'returns false for a video file' do
+        allow(custom_class).to receive(:filename).and_return('video_sample.mp4')
+
+        expect(custom_class).not_to be_audio
+      end
+
+      it 'returns false if file has a dangerous image extension' do
+        allow(custom_class).to receive(:filename).and_return('unsanitized.svg')
+
+        expect(custom_class).to be_dangerous_image
+        expect(custom_class).not_to be_audio
+      end
+
+      it 'returns false if filename is blank' do
+        allow(custom_class).to receive(:filename).and_return(nil)
+
+        expect(custom_class).not_to be_audio
+      end
+    end
+
+    describe '#embeddable?' do
+      it 'returns true for an image file' do
+        allow(custom_class).to receive(:filename).and_return('dk.png')
+
+        expect(custom_class).to be_embeddable
+      end
+
+      it 'returns true for a video file' do
+        allow(custom_class).to receive(:filename).and_return('video_sample.mp4')
+
+        expect(custom_class).to be_embeddable
+      end
+
+      it 'returns true for an audio file' do
+        allow(custom_class).to receive(:filename).and_return('audio_sample.wav')
+
+        expect(custom_class).to be_embeddable
+      end
+
+      it 'returns false if not an embeddable file' do
+        allow(custom_class).to receive(:filename).and_return('doc_sample.txt')
+
+        expect(custom_class).not_to be_embeddable
+      end
+
+      it 'returns false if filename has a dangerous image extension' do
+        allow(custom_class).to receive(:filename).and_return('unsanitized.svg')
+
+        expect(custom_class).to be_dangerous_image
+        expect(custom_class).not_to be_embeddable
+      end
+
+      it 'returns false if filename is blank' do
+        allow(custom_class).to receive(:filename).and_return(nil)
+
+        expect(custom_class).not_to be_embeddable
+      end
+    end
+
+    describe '#dangerous_image?' do
       it 'returns true if file has a dangerous image extension' do
         allow(custom_class).to receive(:filename).and_return('unsanitized.svg')
 
@@ -219,12 +466,18 @@ describe Gitlab::FileTypeDetection do
         expect(custom_class).not_to be_dangerous_image
       end
 
-      it 'returns false for any non image file' do
+      it 'returns false for a video file' do
         allow(custom_class).to receive(:filename).and_return('video_sample.mp4')
 
         expect(custom_class).not_to be_dangerous_image
       end
 
+      it 'returns false for an audio file' do
+        allow(custom_class).to receive(:filename).and_return('audio_sample.wav')
+
+        expect(custom_class).not_to be_dangerous_image
+      end
+
       it 'returns false if filename is blank' do
         allow(custom_class).to receive(:filename).and_return(nil)
 
@@ -232,7 +485,7 @@ describe Gitlab::FileTypeDetection do
       end
     end
 
-    shared_examples '#dangerous_video? for a regular class' do
+    describe '#dangerous_video?' do
       it 'returns false for a safe video file' do
         allow(custom_class).to receive(:filename).and_return('video_sample.mp4')
 
@@ -245,6 +498,12 @@ describe Gitlab::FileTypeDetection do
         expect(custom_class).not_to be_dangerous_video
       end
 
+      it 'returns false for an audio file' do
+        allow(custom_class).to receive(:filename).and_return('audio_sample.wav')
+
+        expect(custom_class).not_to be_dangerous_video
+      end
+
       it 'returns false if file has a dangerous image extension' do
         allow(custom_class).to receive(:filename).and_return('unsanitized.svg')
 
@@ -258,38 +517,74 @@ describe Gitlab::FileTypeDetection do
       end
     end
 
-    let(:custom_class) do
-      custom_class = Class.new do
-        include Gitlab::FileTypeDetection
+    describe '#dangerous_audio?' do
+      it 'returns false for a safe audio file' do
+        allow(custom_class).to receive(:filename).and_return('audio_sample.wav')
+
+        expect(custom_class).not_to be_dangerous_audio
       end
 
-      custom_class.new
-    end
+      it 'returns false for an image file' do
+        allow(custom_class).to receive(:filename).and_return('dk.png')
 
-    describe '#image?' do
-      include_examples '#image? for a regular class'
-    end
+        expect(custom_class).not_to be_dangerous_audio
+      end
 
-    describe '#video?' do
-      include_examples '#video? for a regular class'
-    end
+      it 'returns false for a video file' do
+        allow(custom_class).to receive(:filename).and_return('video_sample.mp4')
 
-    describe '#image_or_video?' do
-      include_examples '#image? for a regular class'
-      include_examples '#video? for a regular class'
-    end
+        expect(custom_class).not_to be_dangerous_audio
+      end
 
-    describe '#dangerous_image?' do
-      include_examples '#dangerous_image? for a regular class'
-    end
+      it 'returns false if file has a dangerous image extension' do
+        allow(custom_class).to receive(:filename).and_return('unsanitized.svg')
 
-    describe '#dangerous_video?' do
-      include_examples '#dangerous_video? for a regular class'
+        expect(custom_class).not_to be_dangerous_audio
+      end
+
+      it 'returns false if filename is blank' do
+        allow(custom_class).to receive(:filename).and_return(nil)
+
+        expect(custom_class).not_to be_dangerous_audio
+      end
     end
 
-    describe '#dangerous_image_or_video?' do
-      include_examples '#dangerous_image? for a regular class'
-      include_examples '#dangerous_video? for a regular class'
+    describe '#dangerous_embeddable?' do
+      it 'returns true if file has a dangerous image extension' do
+        allow(custom_class).to receive(:filename).and_return('unsanitized.svg')
+
+        expect(custom_class).to be_dangerous_embeddable
+      end
+
+      it 'returns false for an image file' do
+        allow(custom_class).to receive(:filename).and_return('dk.png')
+
+        expect(custom_class).not_to be_dangerous_embeddable
+      end
+
+      it 'returns false for a video file' do
+        allow(custom_class).to receive(:filename).and_return('video_sample.mp4')
+
+        expect(custom_class).not_to be_dangerous_embeddable
+      end
+
+      it 'returns false for an audio file' do
+        allow(custom_class).to receive(:filename).and_return('audio_sample.wav')
+
+        expect(custom_class).not_to be_dangerous_embeddable
+      end
+
+      it 'returns false for a non-embeddable file' do
+        allow(custom_class).to receive(:filename).and_return('doc_sample.txt')
+
+        expect(custom_class).not_to be_dangerous_embeddable
+      end
+
+      it 'returns false if filename is blank' do
+        allow(custom_class).to receive(:filename).and_return(nil)
+
+        expect(custom_class).not_to be_dangerous_embeddable
+      end
     end
   end
 end

spec/lib/gitlab/utils/sanitize_node_link_spec.rb

@@ -43,6 +43,11 @@ describe Gitlab::Utils::SanitizeNodeLink do
             doc: HTML::Pipeline.parse("<video><source src='#{scheme}alert(1);'></video>"),
             attr: "src",
             node_to_check: -> (doc) { doc.children.first.children.filter("source").first }
+          },
+          audio: {
+            doc: HTML::Pipeline.parse("<audio><source src='#{scheme}alert(1);'></audio>"),
+            attr: "src",
+            node_to_check: -> (doc) { doc.children.first.children.filter("source").first }
           }
         }
 

spec/models/commit_spec.rb

@@ -503,6 +503,8 @@ eos
       expect(commit.uri_type('files/html')).to be(:tree)
       expect(commit.uri_type('files/images/logo-black.png')).to be(:raw)
       expect(commit.uri_type('files/images/wm.svg')).to be(:raw)
+      expect(project.commit('audio').uri_type('files/audio/clip.mp3')).to be(:raw)
+      expect(project.commit('audio').uri_type('files/audio/sample.wav')).to be(:raw)
       expect(project.commit('video').uri_type('files/videos/intro.mp4')).to be(:raw)
       expect(commit.uri_type('files/js/application.js')).to be(:blob)
     end

spec/support/helpers/test_env.rb

@@ -36,6 +36,7 @@ module TestEnv
     'expand-collapse-lines'              => '238e82d',
     'pages-deploy'                       => '7897d5b',
     'pages-deploy-target'                => '7975be0',
+    'audio'                              => 'c3c21fd',
     'video'                              => '8879059',
     'add-balsamiq-file'                  => 'b89b56d',
     'crlf-diff'                          => '5938907',

spec/support/matchers/markdown_matchers.rb

@@ -193,6 +193,17 @@ module MarkdownMatchers
     end
   end
 
+  # AudioLinkFilter
+  matcher :parse_audio_links do
+    set_default_markdown_messages
+
+    match do |actual|
+      audio = actual.at_css('audio')
+
+      expect(audio['src']).to end_with('/assets/audio/gitlab-demo.wav')
+    end
+  end
+
   # ColorFilter
   matcher :parse_colors do
     set_default_markdown_messages