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<?php |
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/** |
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* Helper to massage Podcast data to be used in the Podcast block. |
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* |
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* @package jetpack |
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*/ |
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/** |
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* Class Jetpack_Podcast_Helper |
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*/ |
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class Jetpack_Podcast_Helper { |
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/** |
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* Gets podcast data formatted to be used by the Podcast Player block in both server-side |
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* block rendering and in API `WPCOM_REST_API_V2_Endpoint_Podcast_Player`. |
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* |
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* The result is cached for one hour. |
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* |
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* @param string $feed The RSS feed to load and list tracks for. |
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* @return array|WP_Error The player data or a error object. |
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*/ |
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public static function get_player_data( $feed ) { |
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$feed = esc_url_raw( $feed ); |
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// Try loading data from the cache. |
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$transient_key = 'jetpack_podcast_' . md5( $feed ); |
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$player_data = get_transient( $transient_key ); |
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// Fetch data if we don't have any cached. |
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if ( false === $player_data || ( defined( 'WP_DEBUG' ) && WP_DEBUG ) ) { |
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// Load feed. |
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$rss = self::load_feed( $feed ); |
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if ( is_wp_error( $rss ) ) { |
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return $rss; |
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} |
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// Get tracks. |
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$tracks = self::get_track_list( $rss ); |
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if ( empty( $tracks ) ) { |
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return new WP_Error( 'no_tracks', __( 'Your Podcast couldn\'t be embedded as it doesn\'t contain any tracks. Please double check your URL.', 'jetpack' ) ); |
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} |
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// Get podcast meta. |
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$title = $rss->get_title(); |
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$title = self::get_plain_text( $title ); |
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$cover = $rss->get_image_url(); |
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$cover = ! empty( $cover ) ? esc_url( $cover ) : null; |
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$link = $rss->get_link(); |
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$link = ! empty( $link ) ? esc_url( $link ) : null; |
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$player_data = array( |
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'title' => $title, |
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'link' => $link, |
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'cover' => $cover, |
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'tracks' => $tracks, |
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); |
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// Cache for 1 hour. |
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set_transient( $transient_key, $player_data, HOUR_IN_SECONDS ); |
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} |
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return $player_data; |
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} |
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/** |
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* Gets a specific track from the supplied feed URL. |
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* |
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* @param string $feed The RSS feed to find the track in. |
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* @param string $guid The GUID of the track. |
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* @return array|WP_Error The track object or an error object. |
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*/ |
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public static function get_track_data( $feed, $guid ) { |
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$feed = esc_url_raw( $feed ); |
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// Try loading track data from the cache. |
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$transient_key = 'jetpack_podcast_' . md5( "$feed::$guid" ); |
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$track_data = get_transient( $transient_key ); |
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// Fetch data if we don't have any cached. |
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if ( false === $track_data || ( defined( 'WP_DEBUG' ) && WP_DEBUG ) ) { |
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// Load feed. |
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$rss = static::load_feed( $feed ); |
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if ( is_wp_error( $rss ) ) { |
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return $rss; |
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} |
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// Loop over all tracks to find the one. |
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foreach ( $rss->get_items() as $track ) { |
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if ( $guid === $track->get_id() ) { |
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$track_data = static::setup_tracks_callback( $track ); |
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break; |
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} |
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} |
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if ( false === $track_data ) { |
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return new WP_Error( 'no_track', __( 'The track was not found.', 'jetpack' ) ); |
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} |
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// Cache for 1 hour. |
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set_transient( $transient_key, $track_data, HOUR_IN_SECONDS ); |
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} |
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return $track_data; |
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} |
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/** |
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* Gets a list of tracks for the supplied RSS feed. |
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* |
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* @param string $rss The RSS feed to load and list tracks for. |
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* @return array|WP_Error The feed's tracks or a error object. |
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*/ |
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private static function get_track_list( $rss ) { |
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// Get first ten items and format them. |
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$track_list = array_map( array( __CLASS__, 'setup_tracks_callback' ), $rss->get_items( 0, 10 ) ); |
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// Filter out any tracks that are empty. |
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// Reset the array indicies. |
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return array_values( array_filter( $track_list ) ); |
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} |
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/** |
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* Formats string as pure plaintext, with no HTML tags or entities present. |
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* This is ready to be used in React, innerText but needs to be escaped |
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* using standard `esc_html` when generating markup on server. |
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* |
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* @param string $str Input string. |
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* @return string Plain text string. |
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*/ |
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private static function get_plain_text( $str ) { |
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// Trim string and return if empty. |
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$str = trim( (string) $str ); |
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if ( empty( $str ) ) { |
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return ''; |
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} |
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// Make sure there are no tags. |
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$str = wp_strip_all_tags( $str ); |
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// Replace all entities with their characters, including all types of quotes. |
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$str = html_entity_decode( $str, ENT_QUOTES ); |
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return $str; |
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} |
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/** |
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* Loads an RSS feed using `fetch_feed`. |
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* |
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* @param string $feed The RSS feed URL to load. |
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* @return SimplePie|WP_Error The RSS object or error. |
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*/ |
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View Code Duplication |
private static function load_feed( $feed ) { |
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$rss = fetch_feed( esc_url_raw( $feed ) ); |
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if ( is_wp_error( $rss ) ) { |
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return new WP_Error( 'invalid_url', __( 'Your podcast couldn\'t be embedded. Please double check your URL.', 'jetpack' ) ); |
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} |
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if ( ! $rss->get_item_quantity() ) { |
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return new WP_Error( 'no_tracks', __( 'Podcast audio RSS feed has no tracks.', 'jetpack' ) ); |
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} |
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return $rss; |
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} |
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/** |
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* Prepares Episode data to be used by the Podcast Player block. |
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* |
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* @param SimplePie_Item $episode SimplePie_Item object, representing a podcast episode. |
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* @return array |
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*/ |
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private static function setup_tracks_callback( SimplePie_Item $episode ) { |
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$enclosure = self::get_audio_enclosure( $episode ); |
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// If the audio enclosure is empty then it is not playable. |
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// We therefore return an empty array for this track. |
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// It will be filtered out later. |
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if ( is_wp_error( $enclosure ) ) { |
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return array(); |
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} |
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// If there is no link return an empty array. We will filter out later. |
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if ( empty( $enclosure->link ) ) { |
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return array(); |
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} |
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// Build track data. |
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$track = array( |
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'id' => wp_unique_id( 'podcast-track-' ), |
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'link' => esc_url( $episode->get_link() ), |
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'src' => esc_url( $enclosure->link ), |
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'type' => esc_attr( $enclosure->type ), |
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'description' => self::get_plain_text( $episode->get_description() ), |
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'title' => self::get_plain_text( $episode->get_title() ), |
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); |
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if ( empty( $track['title'] ) ) { |
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$track['title'] = esc_html__( '(no title)', 'jetpack' ); |
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} |
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if ( ! empty( $enclosure->duration ) ) { |
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$track['duration'] = esc_html( self::format_track_duration( $enclosure->duration ) ); |
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} |
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return $track; |
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} |
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/** |
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* Retrieves an audio enclosure. |
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* |
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* @param SimplePie_Item $episode SimplePie_Item object, representing a podcast episode. |
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* @return SimplePie_Enclosure|null |
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*/ |
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private static function get_audio_enclosure( SimplePie_Item $episode ) { |
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foreach ( (array) $episode->get_enclosures() as $enclosure ) { |
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if ( 0 === strpos( $enclosure->type, 'audio/' ) ) { |
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return $enclosure; |
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} |
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} |
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return new WP_Error( 'invalid_audio', __( 'Podcast audio is an invalid type.', 'jetpack' ) ); |
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} |
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/** |
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* Returns the track duration as a formatted string. |
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* |
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* @param number $duration of the track in seconds. |
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* @return string |
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*/ |
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private static function format_track_duration( $duration ) { |
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$format = $duration > HOUR_IN_SECONDS ? 'H:i:s' : 'i:s'; |
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return date_i18n( $format, $duration ); |
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} |
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} |
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If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check:
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