Add upstream plugins

Signed-off-by: Adrian Nöthlich <git@promasu.tech>

wp-content/plugins/all-in-one-event-calendar/lib/news/feed.php

@@ -0,0 +1,93 @@
+<?php
+
+/**
+ * RSS feed importer.
+ *
+ * @author     Time.ly Network Inc.
+ * @since      2.1
+ *
+ * @package    AI1EC
+ * @subpackage AI1EC.News
+ */
+class Ai1ec_News_Feed {
+
+    /**
+     * Import RSS feed.
+     *
+     * @param int    $limit Number of entries to fetch.
+     * @param string $feed  URI of RSS feed to import.
+     *
+     * @return array RSS feed entries.
+     */
+    public function import_feed( $limit = 5, $feed = AI1EC_RSS_FEED ) {
+        include_once(
+            ABSPATH . WPINC . DIRECTORY_SEPARATOR . 'class-simplepie.php'
+        );
+        $cache  = $this->get_transient_name( $feed );
+        $result = get_site_transient( $cache );
+        if ( false === $result || AI1EC_DEBUG ) {
+            $result     = $this->fetch_feed( $limit, $feed );
+            $expiration = $this->get_expiration( $feed );
+            set_site_transient( $cache, $result, $expiration );
+        }
+        return $result;
+    }
+
+    /**
+     * Fetch feed w/o caching.
+     *
+     * @param int    $limit Number of entries to fetch.
+     * @param string $feed  URI of RSS feed to import.
+     *
+     * @return array List of feed entries.
+     */
+    public function fetch_feed( $limit, $feed ) {
+        if ( ! class_exists( 'SimplePie_File' ) ) {
+            include_once(
+                ABSPATH . WPINC . DIRECTORY_SEPARATOR .'SimplePie'
+                . DIRECTORY_SEPARATOR .'File.php'
+            );
+        }
+        $result = array();
+        try {
+            $file = new SimplePie_File( $feed );
+            $feed = new SimplePie();
+            $feed->set_raw_data( $file->body );
+            $feed->init();
+            if ( ! is_wp_error( $feed ) ) {
+                $result = $feed->get_items( 0, $limit );
+            }
+        } catch ( Exception $exception ) {} // discard
+        return $result;
+    }
+
+    /**
+     * Get name to be used for transient.
+     *
+     * @param string $feed URI of feed to get transien name for.
+     *
+     * @return string Transient name to use.
+     */
+    public function get_transient_name( $feed ) {
+        return ( AI1EC_RSS_FEED === $feed )
+            ? 'ai1ec_rss_feed' :
+            'ai1ec_rss_' . substr( md5( $feed ), 5, 8 );
+    }
+
+    /**
+     * Get expiration time (in seconds) for feed.
+     *
+     * @param string $feed URI of feed to get transien name for.
+     *
+     * @return int Number of seconds to keep cached feed output.
+     */
+    public function get_expiration( $feed ) {
+        $expiration = apply_filters(
+            'wp_feed_cache_transient_lifetime',
+            12 * HOUR_IN_SECONDS,
+            $feed
+        );
+        return $expiration;
+    }
+
+}