2 files changed, 171 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;
+    }
+
+}
+
+?>
diff --git a/providers/Twitter.php b/providers/Twitter.php
new file mode 100644
index 0000000..868bb28
--- /dev/null
+++ b/providers/Twitter.php
@@ -0,0 +1,117 @@
+<?php
+
+namespace Providers;
+
+require_once('Provider.php');
+require_once('../lib/codebird-php/src/codebird.php');
+
+
+class Twitter extends \Providers\Provider {
+
+    private $_api;
+
+    public function __construct($feed, $options=[]) {
+        parent::__construct($feed, $options);
+        $config = json_decode(file_get_contents('../config/twitter.json'), TRUE);
+        \Codebird\Codebird::setConsumerKey($config['key'], $config['secret']);
+        \Codebird\Codebird::setBearerToken($config['token']);
+        $this->_api = \Codebird\Codebird::getInstance();
+    }
+
+    protected function _getCachePath() {
+        return '../cache/twitter.%s.json';
+    }
+
+    protected function _fetchItems() {
+        $content = $this->_api->statuses_userTimeline([
+            'screen_name' => $this->_feed,
+            'count' => 200,
+            'exclude_replies' => TRUE
+        ], TRUE);
+        if (isset($content->rate)) {
+            unset($content->rate);
+        }
+
+        if ($content->httpstatus !== 200) {
+            $errorString = '';
+            if (isset($content->error)) {
+                $errorString = $content->error;
+            }
+            if (isset($content->errors)) {
+                $errorString = implode('\n', array_map(
+                    function($error) {
+                        return $error->message . ' (' . $error->code . ')';
+                    }, $content->errors
+                ));
+            }
+            throw new Exception($errorString);
+        }
+        unset($content->httpstatus);
+
+        return $content;
+    }
+
+    protected function _spamFilter($items) {
+      $db = new \PDO('sqlite:../spamlinks.db');
+      $spamQuery = $db->prepare('SELECT id FROM twitter WHERE username = :name');
+      $spamQuery->bindParam(':name', $user);
+      $spamQuery->execute();
+      $spamContent = array_map(
+          function($row) {
+              return $row[0];
+          },
+          $spamQuery->fetchAll()
+      );
+      $spamHashes = [];
+      $filteredContent = [];
+      foreach ($items as $c) {
+          if (!in_array($c->id_str, $spamContent)) {
+              $twitterURLs = FALSE;
+              $urls = array_filter(
+                  array_map(
+                      function($url) {
+                          return $url->expanded_url;
+                      },
+                      $c->entities->urls
+                  ),
+                  function($url) use(&$twitterURLs) {
+                      $urlParts = parse_url($url);
+                      if ($urlParts['host'] == 'twitter.com') {
+                          $twitterURLs = TRUE;
+                          return FALSE;
+                      }
+                      return TRUE;
+                  }
+              );
+              if (!$urls) {
+                  if (!$twitterURLs) {
+                      $filteredContent[] = $c;
+                  }
+              } else {
+                  sort($urls);
+                  $urlHash = md5(implode('|', $urls));
+                  if (isset($filteredContent[$urlHash])) {
+                      $spamHashes[] = $c->id_str;
+                  }
+                  $filteredContent[$urlHash] = $c;
+              }
+          }
+      }
+      usort($filteredContent, function($c1, $c2) { return strcmp($c1->id_str, $c2->id_str); });
+      $content = $filteredContent;
+      if ($spamHashes) {
+          foreach ($spamHashes as $hash) {
+              $insertQuery = $db->prepare(
+                  'INSERT INTO twitter(id, username) VALUES (?, ?)'
+              );
+              $insertQuery->bindParam(1, $hash);
+              $insertQuery->bindParam(2, $user);
+              $insertQuery->execute();
+          }
+      }
+      return $content;
+    }
+
+}
+
+?>