1 files changed, 54 insertions, 0 deletions
diff --git a/providers/Provider.php b/providers/Provider.php
new file mode 100644
index 0000000..0c3f344
--- /dev/null
+++ b/providers/Provider.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Providers;
+
+abstract class Provider {
+
+    protected $_options = [];
+    protected $_feed = NULL;
+    protected $_cacheTimeout = '15 minutes';
+    protected $_cacheTime;
+
+    public function __construct($feed, $options=[]) {
+        $this->_feed = $feed;
+        $this->_options = $options;
+    }
+
+    abstract protected function _getCachePath();
+
+    protected function _getCache($path) {
+        return file_get_contents($path);
+    }
+
+    abstract protected function _fetchItems();
+
+    abstract protected function _spamFilter($items);
+
+    protected function _getItems() {
+        $cacheFile = sprintf($this->_getCachePath(), $this->_feed);
+        $this->_cacheTime = file_exists($cacheFile) ? filemtime($cacheFile) : 0;
+        if ($this->_cacheTime > strtotime('-' . $this->_cacheTimeout)) {
+            return json_decode($this->_getCache($cacheFile));
+        } else {
+            $content = $this->_fetchItems();
+            file_put_contents($cacheFile, json_encode($content));
+            $this->_cacheTime = time();
+            return $content;
+        }
+    }
+
+    public function get() {
+        $items = $this->_getItems();
+        if (isset($this->_options['spamfilter'])) {
+            $items = $this->_spamFilter($items);
+        }
+        return $items;
+    }
+
+    public function cacheTime() {
+        return $this->_cacheTime;
+    }
+
+}
+
+?>