Embedded youtube videos.

Summary:
Markup support for embedding Youtube videos.

Test Plan:
https://www.youtube.com/watch?v=Vw4KVoEVcr0 was embedded

Reviewed By: epriestley
Reviewers: epriestley
CC: aran, epriestley
Differential Revision: 353

conf/default.conf.php

@@ -339,6 +339,10 @@ return array(
 
   'maniphest.enabled' => true,
 
+// -- Remarkup -------------------------------------------------------------- //
+
+  'remarkup.enable-embedded-youtube' => false,
+
 // -- Customization --------------------------------------------------------- //
 
   // Paths to additional phutil libraries to load.

src/__phutil_library_map__.php

@@ -410,6 +410,7 @@ phutil_register_library_map(array(
     'PhabricatorRemarkupRuleImageMacro' => 'infrastructure/markup/remarkup/markuprule/imagemacro',
     'PhabricatorRemarkupRuleManiphest' => 'infrastructure/markup/remarkup/markuprule/maniphest',
     'PhabricatorRemarkupRuleProxyImage' => 'infrastructure/markup/remarkup/markuprule/proxyimage',
+    'PhabricatorRemarkupRuleYoutube' => 'infrastructure/markup/remarkup/markuprule/youtube',
     'PhabricatorRepository' => 'applications/repository/storage/repository',
     'PhabricatorRepositoryArcanistProject' => 'applications/repository/storage/arcanistproject',
     'PhabricatorRepositoryArcanistProjectEditController' => 'applications/repository/controller/arcansistprojectedit',
@@ -843,6 +844,7 @@ phutil_register_library_map(array(
     'PhabricatorRemarkupRuleImageMacro' => 'PhutilRemarkupRule',
     'PhabricatorRemarkupRuleManiphest' => 'PhutilRemarkupRule',
     'PhabricatorRemarkupRuleProxyImage' => 'PhutilRemarkupRule',
+    'PhabricatorRemarkupRuleYoutube' => 'PhutilRemarkupRule',
     'PhabricatorRepository' => 'PhabricatorRepositoryDAO',
     'PhabricatorRepositoryArcanistProject' => 'PhabricatorRepositoryDAO',
     'PhabricatorRepositoryArcanistProjectEditController' => 'PhabricatorRepositoryController',

src/applications/differential/parser/markup/DifferentialMarkupEngineFactory.php

@@ -31,6 +31,11 @@ class DifferentialMarkupEngineFactory {
     if (PhabricatorEnv::getEnvConfig('files.enable-proxy')) {
       $rules[] = new PhabricatorRemarkupRuleProxyImage();
     }
+
+    if (PhabricatorEnv::getEnvConfig('remarkup.enable-embedded-youtube')) {
+      $rules[] = new PhabricatorRemarkupRuleYoutube();
+    }
+
     $rules[] = new PhutilRemarkupRuleHyperlink();
 
     $rules[] = new PhabricatorRemarkupRuleDifferential();

src/applications/differential/parser/markup/__init__.php

@@ -12,6 +12,7 @@ phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/
 phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/imagemacro');
 phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/maniphest');
 phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/proxyimage');
+phutil_require_module('phabricator', 'infrastructure/markup/remarkup/markuprule/youtube');
 
 phutil_require_module('phutil', 'markup/engine/remarkup');
 phutil_require_module('phutil', 'markup/engine/remarkup/blockrule/remarkupcode');

src/infrastructure/markup/remarkup/markuprule/youtube/PhabricatorRemarkupRuleYoutube.php

@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @group markup
+ */
+class PhabricatorRemarkupRuleYoutube
+  extends PhutilRemarkupRule {
+
+  public function apply($text) {
+    $this->uri = new PhutilURI($text);
+
+    if ($this->uri->getDomain() &&
+        preg_match('/youtube\.com$/', $this->uri->getDomain())) {
+      return $this->markupYoutubeLink();
+    }
+
+    return $text;
+  }
+
+  public function markupYoutubeLink() {
+    $v = idx($this->uri->getQueryParams(), 'v');
+    if ($v) {
+      $youtube_src = 'https://www.youtube.com/embed/'.$v;
+      $iframe =
+        '<div class="embedded-youtube-video">
+              <iframe width="650" height="400" '.
+        'style="margin: 1em auto; border: 0px" '.
+        'src="'.$youtube_src.'" '.
+        'frameborder="0"></iframe>
+            </div>';
+      return $this->getEngine()->storeText($iframe);
+    } else {
+      return $this->uri;
+    }
+  }
+
+}

src/infrastructure/markup/remarkup/markuprule/youtube/__init__.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phutil', 'markup/engine/remarkup/markuprule/base');
+phutil_require_module('phutil', 'parser/uri');
+
+
+phutil_require_source('PhabricatorRemarkupRuleYoutube.php');