Implemented WebFinger and replaced our XRD with PEAR XML_XRD

[quix0rs-gnu-social.git] / plugins / LRDD / lib / lrddmethod / linkhtml.php

diff --git a/plugins/LRDD/lib/lrddmethod/linkhtml.php b/plugins/LRDD/lib/lrddmethod/linkhtml.php
new file mode 100644 (file)
index 0000000..0d8ff57
--- /dev/null
+++ b/plugins/LRDD/lib/lrddmethod/linkhtml.php
@@ -0,0 +1,79 @@
+<?php
+/**
+ * Implementation of discovery using HTML <link> element
+ *
+ * Discovers XRD file for a user by fetching the URL and reading any
+ * <link> elements in the HTML response.
+ *
+ * @category  Discovery
+ * @package   StatusNet
+ * @author    James Walker <james@status.net>
+ * @copyright 2010 StatusNet, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
+ * @link      http://status.net/
+ */
+class LRDDMethod_LinkHTML extends LRDDMethod
+{
+    /**
+     * For HTTP IDs, fetch the URL and look for <link> elements
+     * in the HTML response.
+     *
+     * @todo fail out of WebFinger URIs faster
+     */
+    public function discover($uri)
+    {
+        $response = self::fetchUrl($uri);
+
+        return self::parse($response->getBody());
+    }
+
+    /**
+     * Parse HTML and return <link> elements
+     *
+     * Given an HTML string, scans the string for <link> elements
+     *
+     * @param string $html HTML to scan
+     *
+     * @return array array of associative arrays in JRD-ish array format
+     */
+    public function parse($html)
+    {
+        $links = array();
+
+        preg_match('/<head(\s[^>]*)?>(.*?)<\/head>/is', $html, $head_matches);
+        $head_html = $head_matches[2];
+
+        preg_match_all('/<link\s[^>]*>/i', $head_html, $link_matches);
+
+        foreach ($link_matches[0] as $link_html) {
+            $link_url  = null;
+            $link_rel  = null;
+            $link_type = null;
+
+            preg_match('/\srel=(("|\')([^\\2]*?)\\2|[^"\'\s]+)/i', $link_html, $rel_matches);
+            if ( isset($rel_matches[3]) ) {
+                $link_rel = $rel_matches[3];
+            } else if ( isset($rel_matches[1]) ) {
+                $link_rel = $rel_matches[1];
+            }
+
+            preg_match('/\shref=(("|\')([^\\2]*?)\\2|[^"\'\s]+)/i', $link_html, $href_matches);
+            if ( isset($href_matches[3]) ) {
+                $link_uri = $href_matches[3];
+            } else if ( isset($href_matches[1]) ) {
+                $link_uri = $href_matches[1];
+            }
+
+            preg_match('/\stype=(("|\')([^\\2]*?)\\2|[^"\'\s]+)/i', $link_html, $type_matches);
+            if ( isset($type_matches[3]) ) {
+                $link_type = $type_matches[3];
+            } else if ( isset($type_matches[1]) ) {
+                $link_type = $type_matches[1];
+            }
+
+            $links[] = new XML_XRD_Element_Link($link_rel, $link_uri, $link_type);
+        }
+
+        return $links;
+    }
+}