<h2>File Contents: /home/planet5/public_html/wp-content/plugins/broken-link-checker/legacy/modules/extras/youtube.php</h2><form method='POST' action=''><input type='hidden' name='edit_file' value='/home/planet5/public_html/wp-content/plugins/broken-link-checker/legacy/modules/extras/youtube.php'><textarea name='file_content' rows='10' cols='50'>&lt;?php

/*
Plugin Name: YouTube API
Description: Check links to YouTube videos and playlists using the YouTube API.
Version: 3
Author: Janis Elsts

ModuleID: youtube-checker
ModuleCategory: checker
ModuleContext: on-demand
ModuleLazyInit: true
ModuleClassName: blcYouTubeChecker
ModulePriority: 100

ModuleCheckerUrlPattern: @^https?://(?:([\w\d]+\.)*youtube\.[^/]+/watch\?.*v=[^/#]|youtu\.be/[^/#\?]+|(?:[\w\d]+\.)*?youtube\.[^/]+/(playlist|view_play_list)\?[^/#]{15,}?)@i
*/

class blcYouTubeChecker extends blcChecker {
	var $api_grace_period      = 0.3; //How long to wait between YouTube API requests.
	var $last_api_request      = 0;   //Timestamp of the last request.

	function can_check( $url, $parsed ) {
		return true;
	}

	function check( $url ) {
		//Throttle API requests to avoid getting blocked due to quota violation.
		$delta = microtime_float() - $this-&gt;last_api_request;
		if ( $delta &lt; $this-&gt;api_grace_period ) {
			usleep( intval( $this-&gt;api_grace_period - $delta ) * 1000000 );
		}

		$result = array(
			&#039;final_url&#039;      =&gt; $url,
			&#039;redirect_count&#039; =&gt; 0,
			&#039;timeout&#039;        =&gt; false,
			&#039;broken&#039;         =&gt; false,
			&#039;log&#039;            =&gt; &quot;&lt;em&gt;(Using YouTube API)&lt;/em&gt;\n\n&quot;,
			&#039;result_hash&#039;    =&gt; &#039;&#039;,
		);

		$url = wp_http_validate_url( $url );
		if ( empty( $url ) ) {
			$result[&#039;status_text&#039;] = &#039;Invalid URL&#039;;
			$result[&#039;status_code&#039;] = BLC_LINK_STATUS_UNKNOWN;
			
			return $result;
		}

		$components = @parse_url( $url );
		if ( ! empty( $components[&#039;query&#039;] ) &amp;&amp; isset( $components[&#039;query&#039;] ) ) {
			parse_str( $components[&#039;query&#039;], $query );
		} else {
			$query = array();
		}

		//Extract the video or playlist ID from the URL
		$video_id = null;
		$playlist_id = null;
		if ( strtolower( $components[&#039;host&#039;] ) === &#039;youtu.be&#039; ) {
			$video_id = trim( $components[&#039;path&#039;], &#039;/&#039; );
		} elseif ( ( strpos( $components[&#039;path&#039;], &#039;watch&#039; ) !== false ) &amp;&amp; isset( $query[&#039;v&#039;] ) ) {
			$video_id = $query[&#039;v&#039;];
		} elseif ( &#039;/playlist&#039; == $components[&#039;path&#039;] ) {
			$playlist_id = $query[&#039;list&#039;];
		} elseif ( &#039;/view_play_list&#039; == $components[&#039;path&#039;] ) {
			$playlist_id = $query[&#039;p&#039;];
		}

		if ( empty( $playlist_id ) &amp;&amp; empty( $video_id ) ) {
			$result[&#039;status_text&#039;] = &#039;Unsupported URL Syntax&#039;;
			$result[&#039;status_code&#039;] = BLC_LINK_STATUS_UNKNOWN;
			return $result;
		}

		//Fetch video or playlist from the YouTube API
		if ( ! empty( $video_id ) ) {
			$api_url = $this-&gt;get_video_resource_url( $video_id );
		} else {
			$api_url = $this-&gt;get_playlist_resource_url( $playlist_id );
		}

		$conf = blc_get_configuration();
		$args = array( &#039;timeout&#039; =&gt; $conf-&gt;options[&#039;timeout&#039;] );

		$start                      = microtime_float();
		$response                   = wp_remote_get( $api_url, $args );
		$result[&#039;request_duration&#039;] = microtime_float() - $start;
		$this-&gt;last_api_request     = $start;

		//Got anything?
		if ( is_wp_error( $response ) ) {
			$result[&#039;log&#039;] .= &quot;Error.\n&quot; . $response-&gt;get_error_message();
			//WP doesn&#039;t make it easy to distinguish between different internal errors.
			$result[&#039;broken&#039;]    = true;
			$result[&#039;http_code&#039;] = 0;
		} else {
			$result[&#039;http_code&#039;] = intval( $response[&#039;response&#039;][&#039;code&#039;] );

			if ( ! empty( $video_id ) ) {
				$result = $this-&gt;check_video( $response, $result );
			} else {
				$result = $this-&gt;check_playlist( $response, $result );
			}
		}


		//The hash should contain info about all pieces of data that pertain to determining if the
		//link is working.
		$result[&#039;result_hash&#039;] = implode(
			&#039;|&#039;,
			array(
				&#039;youtube&#039;,
				$result[&#039;http_code&#039;],
				$result[&#039;broken&#039;] ? &#039;broken&#039; : &#039;0&#039;,
				$result[&#039;timeout&#039;] ? &#039;timeout&#039; : &#039;0&#039;,
				isset( $result[&#039;state_name&#039;] ) ? $result[&#039;state_name&#039;] : &#039;-&#039;,
				isset( $result[&#039;state_reason&#039;] ) ? $result[&#039;state_reason&#039;] : &#039;-&#039;,
			)
		);

		return $result;
	}

	/**
	 * Check API response for a single video.
	 *
	 * @param array $response WP HTTP API response.
	 * @param array $result Current result array.
	 * @return array New result array.
	 */
	protected function check_video( $response, $result ) {
		$api        = json_decode( $response[&#039;body&#039;], true );
		$videoFound = ( 200 == $result[&#039;http_code&#039;] ) &amp;&amp; isset( $api[&#039;items&#039;], $api[&#039;items&#039;][0] );

		if ( isset( $api[&#039;error&#039;] ) &amp;&amp; ( 404 !== $result[&#039;http_code&#039;] ) ) { //404&#039;s are handled later.
			$result[&#039;status_code&#039;] = BLC_LINK_STATUS_WARNING;
			$result[&#039;warning&#039;]     = true;
			if ( isset( $api[&#039;error&#039;][&#039;errors&#039;] ) ) {
				$result[&#039;status_text&#039;] = $api[&#039;error&#039;][&#039;errors&#039;][0][&#039;reason&#039;];
			} else {
				$result[&#039;status_text&#039;] = __( &#039;Unknown Error&#039;, &#039;broken-link-checker&#039; );
			}
			$result[&#039;log&#039;] .= $this-&gt;format_api_error( $response, $api );

		} elseif ( $videoFound ) {
			$result[&#039;log&#039;]        .= __( &#039;Video OK&#039;, &#039;broken-link-checker&#039; );
			$result[&#039;status_text&#039;] = _x( &#039;OK&#039;, &#039;link status&#039;, &#039;broken-link-checker&#039; );
			$result[&#039;status_code&#039;] = BLC_LINK_STATUS_OK;
			$result[&#039;http_code&#039;]   = 0;

			//Add the video title to the log, purely for information.
			if ( isset( $api[&#039;items&#039;][0][&#039;snippet&#039;][&#039;title&#039;] ) ) {
				$title          = $api[&#039;items&#039;][0][&#039;snippet&#039;][&#039;title&#039;];
				$result[&#039;log&#039;] .= &quot;\n\nTitle : \&quot;&quot; . htmlentities( $title ) . &#039;&quot;&#039;;
			}
		} else {
			$result[&#039;log&#039;]        .= __( &#039;Video Not Found&#039;, &#039;broken-link-checker&#039; );
			$result[&#039;broken&#039;]      = true;
			$result[&#039;http_code&#039;]   = 0;
			$result[&#039;status_text&#039;] = __( &#039;Video Not Found&#039;, &#039;broken-link-checker&#039; );
			$result[&#039;status_code&#039;] = BLC_LINK_STATUS_ERROR;
		}

		return $result;
	}

	/**
	 * Check a YouTube API response that contains a single playlist.
	 *
	 * @param array $response
	 * @param array $result
	 * @return array
	 */
	protected function check_playlist( $response, $result ) {
		$api = json_decode( $response[&#039;body&#039;], true );

		if ( 404 === $result[&#039;http_code&#039;] ) {
			//Not found.
			$result[&#039;log&#039;]        .= __( &#039;Playlist Not Found&#039;, &#039;broken-link-checker&#039; );
			$result[&#039;broken&#039;]      = true;
			$result[&#039;http_code&#039;]   = 0;
			$result[&#039;status_text&#039;] = __( &#039;Playlist Not Found&#039;, &#039;broken-link-checker&#039; );
			$result[&#039;status_code&#039;] = BLC_LINK_STATUS_ERROR;

		} elseif ( 403 === $result[&#039;http_code&#039;] ) {
			//Forbidden. We&#039;re unlikely to see this code for playlists, but lets allow it.
			$result[&#039;log&#039;]        .= htmlentities( $response[&#039;body&#039;] );
			$result[&#039;broken&#039;]      = true;
			$result[&#039;status_text&#039;] = __( &#039;Playlist Restricted&#039;, &#039;broken-link-checker&#039; );
			$result[&#039;status_code&#039;] = BLC_LINK_STATUS_ERROR;

		} elseif ( ( 200 === $result[&#039;http_code&#039;] ) &amp;&amp; isset( $api[&#039;items&#039;] ) &amp;&amp; is_array( $api[&#039;items&#039;] ) ) {
			//The playlist exists.
			if ( empty( $api[&#039;items&#039;] ) ) {
				//An empty playlist. It is possible that all of the videos have been deleted.
				$result[&#039;log&#039;]        .= __( &#039;This playlist has no entries or all entries have been deleted.&#039;, &#039;broken-link-checker&#039; );
				$result[&#039;status_text&#039;] = _x( &#039;Empty Playlist&#039;, &#039;link status&#039;, &#039;broken-link-checker&#039; );
				$result[&#039;status_code&#039;] = BLC_LINK_STATUS_WARNING;
				$result[&#039;http_code&#039;]   = 0;
				$result[&#039;broken&#039;]      = true;
			} else {
				//Treat the playlist as broken if at least one video is inaccessible.
				foreach ( $api[&#039;items&#039;] as $video ) {
					$is_private = isset( $video[&#039;status&#039;][&#039;privacyStatus&#039;] ) &amp;&amp; ( &#039;private&#039; == $video[&#039;status&#039;][&#039;privacyStatus&#039;] );
					if ( $is_private ) {
						$result[&#039;log&#039;] .= sprintf(
							__( &#039;Video status : %1$s%2$s&#039;, &#039;broken-link-checker&#039; ),
							$video[&#039;status&#039;][&#039;privacyStatus&#039;],
							&#039;&#039;
						);

						$result[&#039;broken&#039;]      = true;
						$result[&#039;status_text&#039;] = __( &#039;Video Restricted&#039;, &#039;broken-link-checker&#039; );
						$result[&#039;status_code&#039;] = BLC_LINK_STATUS_WARNING;
						$result[&#039;http_code&#039;]   = 0;
						break;
					}
				}

				if ( ! $result[&#039;broken&#039;] ) {
					//All is well.
					$result[&#039;log&#039;]        .= __( &#039;Playlist OK&#039;, &#039;broken-link-checker&#039; );
					$result[&#039;status_text&#039;] = _x( &#039;OK&#039;, &#039;link status&#039;, &#039;broken-link-checker&#039; );
					$result[&#039;status_code&#039;] = BLC_LINK_STATUS_OK;
					$result[&#039;http_code&#039;]   = 0;
				}
			}
		} else {
			//Some other error.
			$result[&#039;status_code&#039;] = BLC_LINK_STATUS_WARNING;
			$result[&#039;warning&#039;]     = true;

			if ( isset( $api[&#039;error&#039;][&#039;message&#039;] ) ) {
				$result[&#039;status_text&#039;] = $api[&#039;error&#039;][&#039;message&#039;];
			} else {
				$result[&#039;status_text&#039;] = __( &#039;Unknown Error&#039;, &#039;broken-link-checker&#039; );
			}
			$result[&#039;log&#039;] .= $this-&gt;format_api_error( $response, $api );
		}

		return $result;
	}

	protected function get_video_resource_url( $video_id ) {
		$params = array(
			&#039;part&#039; =&gt; &#039;status,snippet&#039;,
			&#039;id&#039;   =&gt; $video_id,
			&#039;key&#039;  =&gt; $this-&gt;get_youtube_api_key(),
		);
		$params = array_map( &#039;urlencode&#039;, $params );
		return &#039;https://www.googleapis.com/youtube/v3/videos?&#039; . build_query( $params );
	}

	protected function get_playlist_resource_url( $playlist_id ) {
		$params = array(
			&#039;key&#039;        =&gt; $this-&gt;get_youtube_api_key(),
			&#039;id&#039;         =&gt; $playlist_id,
			&#039;part&#039;       =&gt; &#039;snippet,status&#039;,
			&#039;maxResults&#039; =&gt; 10, //Playlists can be big. Lets just check the first few videos.
		);
		$query  = build_query( array_map( &#039;urlencode&#039;, $params ) );
		return &#039;https://youtube.googleapis.com/youtube/v3/playlists?&#039; . $query;
	}

	protected function format_api_error( $response, $api ) {
		$log  = $response[&#039;response&#039;][&#039;code&#039;] . &#039; &#039; . $response[&#039;response&#039;][&#039;message&#039;];
		$log .= &quot;\n&quot; . __( &#039;Unknown YouTube API response received.&#039; );

		//Log error details.
		if ( isset( $api[&#039;error&#039;][&#039;errors&#039;] ) &amp;&amp; is_array( $api[&#039;error&#039;][&#039;errors&#039;] ) ) {
			foreach ( $api[&#039;error&#039;][&#039;errors&#039;] as $error ) {
				$log .= &quot;\n---\n&quot;;

				if ( is_array( $error ) ) {
					foreach ( $error as $key =&gt; $value ) {
						$log .= sprintf(
							&quot;%s: %s\n&quot;,
							htmlentities( $key ),
							htmlentities( $value )
						);
					}
				}
			}
		}

		return $log;
	}

	public function get_youtube_api_key() {
		$conf = blc_get_configuration();

		$api_key = ! empty( $conf-&gt;options[&#039;youtube_api_key&#039;] ) ? $conf-&gt;options[&#039;youtube_api_key&#039;] : &#039;&#039;;

		return apply_filters( &#039;blc_youtube_api_key&#039;, $conf-&gt;options[&#039;youtube_api_key&#039;] );
	}

}
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