]> git.mxchange.org Git - friendica.git/blobdiff - src/Protocol/ActivityPub.php
Merge remote-tracking branch 'upstream/2018.08-rc' into ap1
[friendica.git] / src / Protocol / ActivityPub.php
index ad4308cbb6ee73ac63cb4aaaaad51ddfefc7cfc3..95542ba966200b9fb14aa261f11013814e0468cc 100644 (file)
@@ -122,27 +122,76 @@ class ActivityPub
                return $data;
        }
 
+       private static function fetchPermissionBlockFromConversation($item)
+       {
+               if (empty($item['thr-parent'])) {
+                       return [];
+               }
+
+               $condition = ['item-uri' => $item['thr-parent'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
+               $conversation = DBA::selectFirst('conversation', ['source'], $condition);
+               if (!DBA::isResult($conversation)) {
+                       return [];
+               }
+
+               $activity = json_decode($conversation['source'], true);
+
+               $actor = JsonLD::fetchElement($activity, 'actor', 'id');
+               $profile = ActivityPub::fetchprofile($actor);
+
+               $item_profile = ActivityPub::fetchprofile($item['owner-link']);
+
+               $permissions = [];
+
+               $elements = ['to', 'cc', 'bto', 'bcc'];
+               foreach ($elements as $element) {
+                       if (empty($activity[$element])) {
+                               continue;
+                       }
+                       if (is_string($activity[$element])) {
+                               $activity[$element] = [$activity[$element]];
+                       }
+                       foreach ($activity[$element] as $receiver) {
+                               if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
+                                       $receiver = $item_profile['followers'];
+                               }
+                               if ($receiver != $item['owner-link']) {
+                                       $permissions[$element][] = $receiver;
+                               }
+                       }
+               }
+               return $permissions;
+       }
+
        public static function createPermissionBlockForItem($item)
        {
                $data = ['to' => [], 'cc' => []];
 
+               $data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
+
+               $actor_profile = ActivityPub::fetchprofile($item['author-link']);
+
                $terms = Term::tagArrayFromItemId($item['id']);
 
+               $contacts[$item['author-link']] = $item['author-link'];
+
                if (!$item['private']) {
                        $data['to'][] = self::PUBLIC;
-                       $data['cc'][] = System::baseUrl() . '/followers/' . $item['author-nick'];
+                       if (!empty($actor_profile['followers'])) {
+                               $data['cc'][] = $actor_profile['followers'];
+                       }
 
                        foreach ($terms as $term) {
                                if ($term['type'] != TERM_MENTION) {
                                        continue;
                                }
                                $profile = self::fetchprofile($term['url']);
-                               if (!empty($profile)) {
+                               if (!empty($profile) && empty($contacts[$profile['url']])) {
                                        $data['cc'][] = $profile['url'];
+                                       $contacts[$profile['url']] = $profile['url'];
                                }
                        }
                } else {
-                       //$data['cc'][] = System::baseUrl() . '/followers/' . $item['author-nick'];
                        $receiver_list = Item::enumeratePermissions($item);
 
                        $mentioned = [];
@@ -155,99 +204,84 @@ class ActivityPub
                                if (!empty($cid) && in_array($cid, $receiver_list)) {
                                        $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => Protocol::ACTIVITYPUB]);
                                        $data['to'][] = $contact['url'];
+                                       $contacts[$contact['url']] = $contact['url'];
                                }
                        }
 
                        foreach ($receiver_list as $receiver) {
                                $contact = DBA::selectFirst('contact', ['url'], ['id' => $receiver, 'network' => Protocol::ACTIVITYPUB]);
-                               $data['cc'][] = $contact['url'];
-                       }
-
-                       if (empty($data['to'])) {
-                               $data['to'] = $data['cc'];
-                               $data['cc'] = [];
+                               if (empty($contacts[$contact['url']])) {
+                                       $data['cc'][] = $contact['url'];
+                                       $contacts[$contact['url']] = $contact['url'];
+                               }
                        }
                }
 
-               return $data;
-       }
-
-       public static function fetchTargetInboxes($item, $uid)
-       {
-               $inboxes = [];
-
                $parents = Item::select(['author-link', 'owner-link'], ['parent' => $item['parent']]);
                while ($parent = Item::fetch($parents)) {
                        $profile = self::fetchprofile($parent['author-link']);
-                       if (!empty($profile)) {
-                               $target = defaults($profile, 'sharedinbox', $profile['inbox']);
-                               $inboxes[$target] = $target;
+                       if (!empty($profile) && empty($contacts[$profile['url']])) {
+                               $data['cc'][] = $profile['url'];
+                               $contacts[$profile['url']] = $profile['url'];
                        }
+
                        $profile = self::fetchprofile($parent['owner-link']);
-                       if (!empty($profile)) {
-                               $target = defaults($profile, 'sharedinbox', $profile['inbox']);
-                               $inboxes[$target] = $target;
+                       if (!empty($profile) && empty($contacts[$profile['url']])) {
+                               $data['cc'][] = $profile['url'];
+                               $contacts[$profile['url']] = $profile['url'];
                        }
                }
                DBA::close($parents);
 
-               $terms = Term::tagArrayFromItemId($item['id']);
-               if (!$item['private']) {
-                       $contacts = DBA::select('contact', ['notify', 'batch'], ['uid' => $uid,
-                                       'rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::ACTIVITYPUB]);
-                       while ($contact = DBA::fetch($contacts)) {
-                               $contact = defaults($contact, 'batch', $contact['notify']);
-                               $inboxes[$contact] = $contact;
-                       }
-                       DBA::close($contacts);
+               if (empty($data['to'])) {
+                       $data['to'] = $data['cc'];
+                       $data['cc'] = [];
+               }
 
-                       foreach ($terms as $term) {
-                               if ($term['type'] != TERM_MENTION) {
-                                       continue;
-                               }
-                               $profile = self::fetchprofile($term['url']);
-                               if (!empty($profile)) {
-                                       $target = defaults($profile, 'sharedinbox', $profile['inbox']);
-                                       $inboxes[$target] = $target;
-                               }
-                       }
-               } else {
-                       $receiver_list = Item::enumeratePermissions($item);
+               return $data;
+       }
 
-                       $mentioned = [];
+       public static function fetchTargetInboxes($item, $uid)
+       {
+               $permissions = self::createPermissionBlockForItem($item);
+               if (empty($permissions)) {
+                       return [];
+               }
 
-                       foreach ($terms as $term) {
-                               if ($term['type'] != TERM_MENTION) {
-                                       continue;
-                               }
-                               $cid = Contact::getIdForURL($term['url'], $uid);
-                               if (!empty($cid) && in_array($cid, $receiver_list)) {
-                                       $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid, 'network' => Protocol::ACTIVITYPUB]);
-                                       $profile = self::fetchprofile($contact['url']);
-                                       if (!empty($profile['network'])) {
+               $inboxes = [];
+
+               $item_profile = ActivityPub::fetchprofile($item['owner-link']);
+
+               $elements = ['to', 'cc', 'bto', 'bcc'];
+               foreach ($elements as $element) {
+                       if (empty($permissions[$element])) {
+                               continue;
+                       }
+                       foreach ($permissions[$element] as $receiver) {
+                               if ($receiver == $item_profile['followers']) {
+                                       $contacts = DBA::select('contact', ['notify', 'batch'], ['uid' => $uid,
+                                               'rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::ACTIVITYPUB]);
+                                       while ($contact = DBA::fetch($contacts)) {
+                                               $contact = defaults($contact, 'batch', $contact['notify']);
+                                               $inboxes[$contact] = $contact;
+                                       }
+                                       DBA::close($contacts);
+                               } else {
+                                       $profile = self::fetchprofile($receiver);
+                                       if (!empty($profile)) {
                                                $target = defaults($profile, 'sharedinbox', $profile['inbox']);
                                                $inboxes[$target] = $target;
                                        }
                                }
                        }
-
-                       foreach ($receiver_list as $receiver) {
-                               $contact = DBA::selectFirst('contact', ['url'], ['id' => $receiver, 'network' => Protocol::ACTIVITYPUB]);
-                               $profile = self::fetchprofile($contact['url']);
-                               if (!empty($profile['network'])) {
-                                       $target = defaults($profile, 'sharedinbox', $profile['inbox']);
-                                       $inboxes[$target] = $target;
-                               }
-                       }
                }
 
-               $profile = self::fetchprofile($item['author-link']);
-               if (!empty($profile['sharedinbox'])) {
-                       unset($inboxes[$profile['sharedinbox']]);
+               if (!empty($item_profile['sharedinbox'])) {
+                       unset($inboxes[$item_profile['sharedinbox']]);
                }
 
-               if (!empty($profile['inbox'])) {
-                       unset($inboxes[$profile['inbox']]);
+               if (!empty($item_profile['inbox'])) {
+                       unset($inboxes[$item_profile['inbox']]);
                }
 
                return $inboxes;
@@ -276,8 +310,8 @@ class ActivityPub
                        'conversation' => 'ostatus:conversation',
                        'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri']]];
 
-               $data['type'] = 'Create';
                $data['id'] = $item['uri'] . '#activity';
+               $data['type'] = 'Create';
                $data['actor'] = $item['author-link'];
 
                $data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
@@ -286,9 +320,12 @@ class ActivityPub
                        $data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
                }
 
+               $data['context_id'] = $item['parent'];
+               $data['context'] = self::createConversationURLFromItem($item);
+
                $data = array_merge($data, ActivityPub::createPermissionBlockForItem($item));
 
-               $data['object'] = self::createNote($item);
+               $data['object'] = self::createObjectTypeFromItem($item);
 
                $owner = User::getOwnerDataById($item['uid']);
 
@@ -309,7 +346,7 @@ class ActivityPub
                        'conversation' => 'ostatus:conversation',
                        'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri']]];
 
-               $data = array_merge($data, self::createNote($item));
+               $data = array_merge($data, self::createObjectTypeFromItem($item));
 
 
                return $data;
@@ -332,45 +369,63 @@ class ActivityPub
                                $tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
                        }
                }
-
                return $tags;
        }
 
-       public static function createNote($item)
+       private static function createConversationURLFromItem($item)
        {
+               $conversation = DBA::selectFirst('conversation', ['conversation-uri'], ['item-uri' => $item['parent-uri']]);
+               if (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
+                       $conversation_uri = $conversation['conversation-uri'];
+               } else {
+                       $conversation_uri = $item['parent-uri'];
+               }
+               return $conversation_uri;
+       }
+
+       private static function createObjectTypeFromItem($item)
+       {
+               if (!empty($item['title'])) {
+                       $type = 'Article';
+               } else {
+                       $type = 'Note';
+               }
+
                $data = [];
-               $data['type'] = 'Note';
                $data['id'] = $item['uri'];
+               $data['type'] = $type;
+               $data['summary'] = null; // Ignore by now
 
                if ($item['uri'] != $item['thr-parent']) {
                        $data['inReplyTo'] = $item['thr-parent'];
-               }
-
-               $conversation = DBA::selectFirst('conversation', ['conversation-uri'], ['item-uri' => $item['parent-uri']]);
-               if (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
-                       $conversation_uri = $conversation['conversation-uri'];
                } else {
-                       $conversation_uri = $item['parent-uri'];
+                       $data['inReplyTo'] = null;
                }
 
-               $data['context'] = $data['conversation'] = $conversation_uri;
-               $data['actor'] = $item['author-link'];
-               $data = array_merge($data, ActivityPub::createPermissionBlockForItem($item));
                $data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
 
                if ($item["created"] != $item["edited"]) {
                        $data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
                }
 
+               $data['url'] = $item['plink'];
                $data['attributedTo'] = $item['author-link'];
-               $data['name'] = BBCode::convert($item['title'], false, 7);
+               $data['actor'] = $item['author-link'];
+               $data['sensitive'] = false; // - Query NSFW
+               $data['context_id'] = $item['parent'];
+               $data['conversation'] = $data['context'] = self::createConversationURLFromItem($item);
+
+               if (!empty($item['title'])) {
+                       $data['name'] = BBCode::convert($item['title'], false, 7);
+               }
+
                $data['content'] = BBCode::convert($item['body'], false, 7);
                $data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
-               $data['summary'] = ''; // Ignore by now
-               $data['sensitive'] = false; // - Query NSFW
-               //$data['emoji'] = []; // Ignore by now
-               $data['tag'] = self::createTagList($item);
                $data['attachment'] = []; // @ToDo
+               $data['tag'] = self::createTagList($item);
+               $data = array_merge($data, ActivityPub::createPermissionBlockForItem($item));
+
+               //$data['emoji'] = []; // Ignore by now
                return $data;
        }
 
@@ -643,21 +698,48 @@ class ActivityPub
 
        public static function processInbox($body, $header, $uid)
        {
-               logger('Incoming message for user ' . $uid, LOGGER_DEBUG);
-
-               if (!HTTPSignature::verifyAP($body, $header)) {
-                       logger('Invalid signature, message will be discarded.', LOGGER_DEBUG);
+               $http_signer = HTTPSignature::getSigner($body, $header);
+               if (empty($http_signer)) {
+                       logger('Invalid HTTP signature, message will be discarded.', LOGGER_DEBUG);
                        return;
+               } else {
+                       logger('HTTP signature is signed by ' . $http_signer, LOGGER_DEBUG);
                }
 
                $activity = json_decode($body, true);
 
-               if (!is_array($activity)) {
+               $actor = JsonLD::fetchElement($activity, 'actor', 'id');
+               logger('Message for user ' . $uid . ' is from actor ' . $actor, LOGGER_DEBUG);
+
+               if (empty($activity)) {
                        logger('Invalid body.', LOGGER_DEBUG);
                        return;
                }
 
-               self::processActivity($activity, $body, $uid);
+               if (LDSignature::isSigned($activity)) {
+                       $ld_signer = LDSignature::getSigner($activity);
+                       if (!empty($ld_signer && ($actor == $http_signer))) {
+                               logger('The HTTP and the JSON-LD signature belong to ' . $ld_signer, LOGGER_DEBUG);
+                               $trust_source = true;
+                       } elseif (!empty($ld_signer)) {
+                               logger('JSON-LD signature is signed by ' . $ld_signer, LOGGER_DEBUG);
+                               $trust_source = true;
+                       } elseif ($actor == $http_signer) {
+                               logger('Bad JSON-LD signature, but HTTP signer fits the actor.', LOGGER_DEBUG);
+                               $trust_source = true;
+                       } else {
+                               logger('Invalid JSON-LD signature and the HTTP signer is different.', LOGGER_DEBUG);
+                               $trust_source = false;
+                       }
+               } elseif ($actor == $http_signer) {
+                       logger('Trusting post without JSON-LD signature, The actor fits the HTTP signer.', LOGGER_DEBUG);
+                       $trust_source = true;
+               } else {
+                       logger('No JSON-LD signature, different actor.', LOGGER_DEBUG);
+                       $trust_source = false;
+               }
+
+               self::processActivity($activity, $body, $uid, $trust_source);
        }
 
        public static function fetchOutbox($url, $uid)
@@ -679,11 +761,11 @@ class ActivityPub
                }
 
                foreach ($items as $activity) {
-                       self::processActivity($activity, '', $uid);
+                       self::processActivity($activity, '', $uid, true);
                }
        }
 
-       private static function prepareObjectData($activity, $uid)
+       private static function prepareObjectData($activity, $uid, $trust_source)
        {
                $actor = JsonLD::fetchElement($activity, 'actor', 'id');
                if (empty($actor)) {
@@ -703,23 +785,6 @@ class ActivityPub
 
                logger('Receivers: ' . json_encode($receivers), LOGGER_DEBUG);
 
-               $unsigned = true;
-
-               if (LDSignature::isSigned($activity)) {
-                       if (!LDSignature::isVerified($activity)) {
-                               logger('Invalid signature. Quitting here.', LOGGER_DEBUG);
-                               return [];
-                       }
-                       logger('Valid signature.', LOGGER_DEBUG);
-                       $unsigned = false;
-               } elseif (!in_array(0, $receivers)) {
-                       /// @todo Add some checks to only accept unsigned private posts directly from the actor
-                       $unsigned = false;
-                       logger('Private post without signature.', LOGGER_DEBUG);
-               } else {
-                       logger('Public post without signature. Object data will be fetched.', LOGGER_DEBUG);
-               }
-
                if (is_string($activity['object'])) {
                        $object_url = $activity['object'];
                } elseif (!empty($activity['object']['id'])) {
@@ -731,7 +796,7 @@ class ActivityPub
 
                // Fetch the content only on activities where this matters
                if (in_array($activity['type'], ['Create', 'Update', 'Announce'])) {
-                       $object_data = self::fetchObject($object_url, $activity['object'], $unsigned);
+                       $object_data = self::fetchObject($object_url, $activity['object'], $trust_source);
                        if (empty($object_data)) {
                                logger("Object data couldn't be processed", LOGGER_DEBUG);
                                return [];
@@ -767,7 +832,7 @@ class ActivityPub
                return $object_data;
        }
 
-       private static function processActivity($activity, $body = '', $uid = null)
+       private static function processActivity($activity, $body = '', $uid = null, $trust_source = false)
        {
                if (empty($activity['type'])) {
                        logger('Empty type', LOGGER_DEBUG);
@@ -793,7 +858,7 @@ class ActivityPub
 
                logger('Processing activity: ' . $activity['type'], LOGGER_DEBUG);
 
-               $object_data = self::prepareObjectData($activity, $uid);
+               $object_data = self::prepareObjectData($activity, $uid, $trust_source);
                if (empty($object_data)) {
                        logger('No object data found', LOGGER_DEBUG);
                        return;
@@ -935,14 +1000,15 @@ class ActivityPub
                return $object_data;
        }
 
-       private static function fetchObject($object_url, $object = [], $unsigned = true)
+       private static function fetchObject($object_url, $object = [], $trust_source = false)
        {
-               if ($unsigned) {
+               if (!$trust_source || is_string($object)) {
                        $data = self::fetchContent($object_url);
                        if (empty($data)) {
                                logger('Empty content for ' . $object_url . ', check if content is available locally.', LOGGER_DEBUG);
                                $data = $object_url;
-                               $data = $object;
+                       } else {
+                               logger('Fetched content for ' . $object_url, LOGGER_DEBUG);
                        }
                } else {
                        logger('Using original object for url ' . $object_url, LOGGER_DEBUG);
@@ -956,7 +1022,7 @@ class ActivityPub
                                return false;
                        }
                        logger('Using already stored item for url ' . $object_url, LOGGER_DEBUG);
-                       $data = self::createNote($item);
+                       $data = self::createObjectTypeFromItem($item);
                }
 
                if (empty($data['type'])) {