From 4cb1ed2c9da673ffc0a0d752906ebdee292c5ea4 Mon Sep 17 00:00:00 2001
From: Diogo Cordeiro <diogo@fc.up.pt>
Date: Fri, 6 Jul 2018 11:47:28 +0100
Subject: [PATCH] Add discovery module

---
 utils/discovery.php | 65 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 utils/discovery.php

diff --git a/utils/discovery.php b/utils/discovery.php
new file mode 100644
index 0000000..f1c45da
--- /dev/null
+++ b/utils/discovery.php
@@ -0,0 +1,65 @@
+<?php
+/**
+ * GNU social - a federating social network
+ *
+ * An activity
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category  Feed
+ * @package   GNUsocial
+ * @author    Daniel Supernault <danielsupernault@gmail.com>
+ * @author    Diogo Cordeiro <diogo@fc.up.pt>
+ * @copyright 2018 Free Software Foundaction, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      https://gnu.io/social
+ */
+
+if (!defined('GNUSOCIAL')) { exit(1); }
+
+class Activitypub_Discovery {
+    public function lookup ($url)
+    {
+        // First check if we already have it locally
+        if (($actor_profile = Profile::getKV("profileurl", $url)) != false) {
+            return $actor_profile;
+        }
+
+        // If that's not the case, grab it
+        $client         = new HTTPClient ();
+        $headers        = array();
+        $headers[]      = 'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"';
+        $headers[]      = 'User-Agent: GNUSocialBot v0.1 - https://gnu.io/social';
+        $response       = $client->get ($url, $headers);
+        $this->response = json_decode ($response->getBody (), JSON_UNESCAPED_SLASHES);
+        if (!$response->isOk ())
+            ActivityPubReturn::error("Invalid Actor URL", 404);
+        return $this->storeProfile ();
+    }
+
+    public function storeProfile ()
+    {
+        $res                 = $this->response;
+        $profile             = new Profile;
+        $profile->profileurl = $res["url"];
+        $profile->nickname   = $res["nickname"];
+        $profile->fulname    = $res["display_name"];
+        $profile->bio        = str_limit($res["summary"], 1000);
+        $profile->insert ();
+
+        return $profile;
+    }
+}