[ActivityPub] Add support fox search-box profile/notice grabbing

NoticeSearchAction:
- Add new event before finding query matches

ActivityPubPlugin:
- Subscribe new searchNotice event
- Bump minor version number

Activitypub_explorer:
- Update lookup to make remote-grabbing optional

DOCUMENTATION/DEVELOPERS/EVENTS.txt

@@ -1496,3 +1496,16 @@ StartDocNav: Before outputting the docs Nav
 
 EndDocNav: After outputting the docs Nav
 - $nav: The DoclNav widget
+
+StartNoticeSearch: Before finding notices that match the given query
+- string $query: The text query
+
+StartNoticeSearchShowResults: Before displaying notices matching the query
+- $out:     HTMLOutputter used to output
+- $query:   The text query
+- $notices: Array of DB notice objects
+
+EndNoticeSearchShowResults: After displaying notices matching the query
+- $out:     HTMLOutputter used to output
+- $query:   The text query
+- $notices: Array of DB notice objects

actions/noticesearch.php

@@ -65,6 +65,8 @@ class NoticesearchAction extends SearchAction
 
         if (!empty($this->q)) {
 
+            Event::handle('StartNoticeSearch', [$this->q]);
+
             $stream  = new SearchNoticeStream($this->q, $this->scoped);
             $page    = $this->trimmed('page');
 

plugins/ActivityPub/ActivityPubPlugin.php

@@ -50,7 +50,7 @@ const ACTIVITYPUB_PUBLIC_TO = ['https://www.w3.org/ns/activitystreams#Public',
  */
 class ActivityPubPlugin extends Plugin
 {
-    const PLUGIN_VERSION = '0.3.0alpha0';
+    const PLUGIN_VERSION = '0.4.0alpha0';
 
     /**
      * Returns a Actor's URI from its local $profile
@@ -119,7 +119,7 @@ class ActivityPubPlugin extends Plugin
             $client    = new HTTPClient();
             $headers   = [];
             $headers[] = 'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"';
-            $headers[] = 'User-Agent: GNUSocialBot v0.1 - https://gnu.io/social';
+            $headers[] = 'User-Agent: GNUSocialBot ' . GNUSOCIAL_VERSION . ' - https://gnu.io/social';
             $response  = $client->get($url, $headers);
             $object = json_decode($response->getBody(), true);
             Activitypub_notice::validate_note($object);
@@ -398,6 +398,68 @@ class ActivityPubPlugin extends Plugin
         return true;
     }
 
+    /**
+     * Hack the notice search-box and try to grab remote profiles or notices.
+     * 
+     * Note that, on successful grabbing, this function will redirect to the
+     * new profile/notice, so URL searching is directly affected. A good solution
+     * for this is to store the URLs in the notice text without the https/http
+     * prefixes. This would change the queries for URL searching and therefore we
+     * could do both search and grab.
+     * 
+     * @param string $query search query
+     * @return void
+     */
+    public function onStartNoticeSearch(string $query): void
+    {
+        if (!common_logged_in()) {
+            // early return, search-only for non-logged sessions
+            return;
+        }
+
+        if (!filter_var($query, FILTER_VALIDATE_URL) &&
+            !preg_match('!^((?:\w+\.)*\w+@(?:\w+\.)*\w+(?:\w+\-\w+)*\.\w+)$!', $query)) {
+            // early return, not an url or webfinger ID
+            return;
+        }
+
+        // someone we know about ?
+        try {
+            $explorer = new Activitypub_explorer();
+            $profile = $explorer->lookup($query, false)[0];
+            if ($profile instanceof Profile) {
+                return;
+            }
+        } catch (Exception $e) {
+            // nope
+        }
+
+        // some notice we know about ?
+        try {
+            $notice = self::grab_notice_from_url($query, false);
+            if ($notice instanceof Notice) {
+                return;
+            }
+        } catch (Exception $e) {
+            // nope
+        }
+
+        // try to grab profile
+        $aprofile = self::pull_remote_profile($query);
+        if ($aprofile instanceof Activitypub_profile) {
+            $url = common_local_url('userbyid', ['id' => $aprofile->getID()], null, null, false);
+            common_redirect($url, 303);
+            return;
+        }
+
+        // try to grab notice
+        $notice = self::grab_notice_from_url($query);
+        if ($notice instanceof Notice) {
+            $url = common_local_url('shownotice', ['notice' => $notice->getID()]);
+            common_redirect($url, 303);
+        }
+    }
+
     /**
      * Make sure necessary tables are filled out.
      *

plugins/ActivityPub/lib/explorer.php

@@ -65,13 +65,14 @@ class Activitypub_explorer
      * so that there is no erroneous data
      *
      * @param string $url User's url
+     * @param bool $remote remote lookup?
      * @return array of Profile objects
      * @throws HTTP_Request2_Exception
      * @throws NoProfileException
      * @throws ServerException
      * @author Diogo Cordeiro <diogo@fc.up.pt>
      */
-    public function lookup($url)
+    public function lookup(string $url, bool $remote = true)
     {
         if (in_array($url, ACTIVITYPUB_PUBLIC_TO)) {
             return [];
@@ -80,7 +81,7 @@ class Activitypub_explorer
         common_debug('ActivityPub Explorer: Started now looking for '.$url);
         $this->discovered_actor_profiles = [];
 
-        return $this->_lookup($url);
+        return $this->_lookup($url, $remote);
     }
 
     /**
@@ -89,6 +90,7 @@ class Activitypub_explorer
      * $discovered_actor_profiles array
      *
      * @param string $url User's url
+     * @param bool $remote remote lookup?
      * @return array of Profile objects
      * @throws HTTP_Request2_Exception
      * @throws NoProfileException
@@ -96,11 +98,13 @@ class Activitypub_explorer
      * @throws Exception
      * @author Diogo Cordeiro <diogo@fc.up.pt>
      */
-    private function _lookup($url)
+    private function _lookup(string $url, bool $remote)
     {
-        // First check if we already have it locally and, if so, return it
-        // If the local fetch fails: grab it remotely, store locally and return
-        if (! ($this->grab_local_user($url) || $this->grab_remote_user($url))) {
+        $grab_local = $this->grab_local_user($url);
+
+        // First check if we already have it locally and, if so, return it.
+        // If the local fetch fails and remote grab is required: store locally and return.
+        if (!$grab_local && (!$remote || !$this->grab_remote_user($url))) {
             throw new Exception('User not found.');
         }
 
@@ -403,7 +407,7 @@ class Activitypub_explorer
         $client    = new HTTPClient();
         $headers   = [];
         $headers[] = 'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"';
-        $headers[] = 'User-Agent: GNUSocialBot v0.1 - https://gnu.io/social';
+        $headers[] = 'User-Agent: GNUSocialBot ' . GNUSOCIAL_VERSION . ' - https://gnu.io/social';
         $response  = $client->get($url, $headers);
         if (!$response->isOk()) {
             throw new Exception('Invalid Actor URL.');