current code from svn, revision 62608

1 files changed, 44 insertions, 0 deletions

diff --git a/lib/classes/OpenGraph.php b/lib/classes/OpenGraph.php
new file mode 100644
index 0000000..75326aa
--- /dev/null
+++ b/lib/classes/OpenGraph.php
@@ -0,0 +1,44 @@
+<?php
+/**
+ * Open Graph class that extracts open graph urls from a given string.
+ *
+ * @author  Jan-Hendrik Willms <tleilax+studip@gmail.com>
+ * @license GPL2 or any later version
+ * @since   Stud.IP 3.4
+ */
+class OpenGraph
+{
+    /**
+     * Extracts urls and their according open graph infos from a given string
+     *
+     * @param String $string Text to extract urls and open graph infos from
+     * @return OpenGraphURLCollection containing the extracted urls
+     */
+    public static function extract($string)
+    {
+        $collection = new OpenGraphURLCollection;
+
+        if (Config::get()->OPENGRAPH_ENABLE) {
+            $regexp = StudipCoreFormat::getStudipMarkup('links')['start'];
+            $matched = preg_match_all('/' . $regexp . '/ums', $string, $matches, PREG_SET_ORDER);
+            foreach ($matches as $match) {
+                $url = $match[2];
+
+                if (!$url) {
+                    continue;
+                }
+
+                if (!isLinkIntern($url)) {
+                    $og_url = OpenGraphURL::fromURL($url);
+                    if ($og_url && !$collection->find($og_url->id)) {
+                        $og_url->store();
+
+                        $collection[] = $og_url;
+                    }
+                }
+            }
+        }
+
+        return $collection;
+    }
+}