93 lines
2.6 KiB
PHP
93 lines
2.6 KiB
PHP
<?php
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/**
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* RSS feed importer.
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*
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* @author Time.ly Network Inc.
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* @since 2.1
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*
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* @package AI1EC
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* @subpackage AI1EC.News
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*/
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class Ai1ec_News_Feed {
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/**
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* Import RSS feed.
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*
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* @param int $limit Number of entries to fetch.
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* @param string $feed URI of RSS feed to import.
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*
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* @return array RSS feed entries.
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*/
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public function import_feed( $limit = 5, $feed = AI1EC_RSS_FEED ) {
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include_once(
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ABSPATH . WPINC . DIRECTORY_SEPARATOR . 'class-simplepie.php'
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);
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$cache = $this->get_transient_name( $feed );
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$result = get_site_transient( $cache );
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if ( false === $result || AI1EC_DEBUG ) {
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$result = $this->fetch_feed( $limit, $feed );
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$expiration = $this->get_expiration( $feed );
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set_site_transient( $cache, $result, $expiration );
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}
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return $result;
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}
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/**
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* Fetch feed w/o caching.
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*
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* @param int $limit Number of entries to fetch.
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* @param string $feed URI of RSS feed to import.
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*
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* @return array List of feed entries.
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*/
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public function fetch_feed( $limit, $feed ) {
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if ( ! class_exists( 'SimplePie_File' ) ) {
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include_once(
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ABSPATH . WPINC . DIRECTORY_SEPARATOR .'SimplePie'
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. DIRECTORY_SEPARATOR .'File.php'
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);
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}
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$result = array();
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try {
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$file = new SimplePie_File( $feed );
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$feed = new SimplePie();
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$feed->set_raw_data( $file->body );
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$feed->init();
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if ( ! is_wp_error( $feed ) ) {
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$result = $feed->get_items( 0, $limit );
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}
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} catch ( Exception $exception ) {} // discard
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return $result;
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}
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/**
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* Get name to be used for transient.
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*
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* @param string $feed URI of feed to get transien name for.
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*
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* @return string Transient name to use.
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*/
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public function get_transient_name( $feed ) {
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return ( AI1EC_RSS_FEED === $feed )
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? 'ai1ec_rss_feed' :
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'ai1ec_rss_' . substr( md5( $feed ), 5, 8 );
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}
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/**
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* Get expiration time (in seconds) for feed.
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*
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* @param string $feed URI of feed to get transien name for.
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*
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* @return int Number of seconds to keep cached feed output.
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*/
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public function get_expiration( $feed ) {
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$expiration = apply_filters(
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'wp_feed_cache_transient_lifetime',
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12 * HOUR_IN_SECONDS,
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$feed
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);
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return $expiration;
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}
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}
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