--- /dev/null
+<?php
+/**
+ * @file src/Protocol/ActivityPub.php
+ */
+namespace Friendica\Protocol;
+
+use Friendica\Database\DBA;
+use Friendica\Core\System;
+use Friendica\BaseObject;
+use Friendica\Util\Network;
+use Friendica\Util\HTTPSignature;
+use Friendica\Core\Protocol;
+use Friendica\Model\Item;
+use Friendica\Model\User;
+use Friendica\Util\DateTimeFormat;
+use Friendica\Util\Crypto;
+use Friendica\Content\Text\BBCode;
+
+/**
+ * @brief ActivityPub Protocol class
+ * The ActivityPub Protocol is a message exchange protocol defined by the W3C.
+ * https://www.w3.org/TR/activitypub/
+ * https://www.w3.org/TR/activitystreams-core/
+ * https://www.w3.org/TR/activitystreams-vocabulary/
+ *
+ * https://blog.joinmastodon.org/2018/06/how-to-implement-a-basic-activitypub-server/
+ * https://blog.joinmastodon.org/2018/07/how-to-make-friends-and-verify-requests/
+ */
+class ActivityPub
+{
+ const PUBLIC = 'https://www.w3.org/ns/activitystreams#Public';
+
+ public static function transmit($content, $target, $uid)
+ {
+ $owner = User::getOwnerDataById($uid);
+
+ if (!$owner) {
+ return;
+ }
+
+ $host = parse_url($target, PHP_URL_HOST);
+ $path = parse_url($target, PHP_URL_PATH);
+ $date = date('r');
+
+ $headers = ['Host: ' . $host, 'Date: ' . $date];
+
+ $signed_data = "(request-target): post " . $path . "\nhost: " . $host . "\ndate: " . $date;
+
+ $signature = base64_encode(Crypto::rsaSign($signed_data, $owner['uprvkey'], 'sha256'));
+
+ $headers[] = 'Signature: keyId="' . $owner['url'] . '#main-key' . '",headers="(request-target) host date",signature="' . $signature . '"';
+ $headers[] = 'Content-Type: application/activity+json';
+//print_r($headers);
+//die($signed_data);
+//$headers = [];
+// $headers = HTTPSignature::createSig('', $headers, $owner['uprvkey'], $owner['url'] . '#main-key', false, false, 'sha256');
+
+ Network::post($target, $content, $headers);
+ $return_code = BaseObject::getApp()->get_curl_code();
+echo $return_code."\n";
+ print_r(BaseObject::getApp()->get_curl_headers());
+ print_r($headers);
+ }
+
+ /**
+ * Return the ActivityPub profile of the given user
+ *
+ * @param integer $uid User ID
+ * @return array
+ */
+ public static function profile($uid)
+ {
+ $accounttype = ['Person', 'Organization', 'Service', 'Group', 'Application'];
+
+ $condition = ['uid' => $uid, 'blocked' => false, 'account_expired' => false,
+ 'account_removed' => false, 'verified' => true];
+ $fields = ['guid', 'nickname', 'pubkey', 'account-type'];
+ $user = DBA::selectFirst('user', $fields, $condition);
+ if (!DBA::isResult($user)) {
+ return [];
+ }
+
+ $fields = ['locality', 'region', 'country-name'];
+ $profile = DBA::selectFirst('profile', $fields, ['uid' => $uid, 'is-default' => true]);
+ if (!DBA::isResult($profile)) {
+ return [];
+ }
+
+ $fields = ['name', 'url', 'location', 'about', 'avatar'];
+ $contact = DBA::selectFirst('contact', $fields, ['uid' => $uid, 'self' => true]);
+ if (!DBA::isResult($contact)) {
+ return [];
+ }
+
+ $data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
+ ['uuid' => 'http://schema.org/identifier', 'sensitive' => 'as:sensitive',
+ 'vcard' => 'http://www.w3.org/2006/vcard/ns#']]];
+
+ $data['id'] = $contact['url'];
+ $data['uuid'] = $user['guid'];
+ $data['type'] = $accounttype[$user['account-type']];
+ $data['following'] = System::baseUrl() . '/following/' . $user['nickname'];
+ $data['followers'] = System::baseUrl() . '/followers/' . $user['nickname'];
+ $data['inbox'] = System::baseUrl() . '/inbox/' . $user['nickname'];
+ $data['outbox'] = System::baseUrl() . '/outbox/' . $user['nickname'];
+ $data['preferredUsername'] = $user['nickname'];
+ $data['name'] = $contact['name'];
+ $data['vcard:hasAddress'] = ['@type' => 'Home', 'vcard:country-name' => $profile['country-name'],
+ 'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
+ $data['summary'] = $contact['about'];
+ $data['url'] = $contact['url'];
+ $data['manuallyApprovesFollowers'] = false;
+ $data['publicKey'] = ['id' => $contact['url'] . '#main-key',
+ 'owner' => $contact['url'],
+ 'publicKeyPem' => $user['pubkey']];
+ $data['endpoints'] = ['sharedInbox' => System::baseUrl() . '/inbox'];
+ $data['icon'] = ['type' => 'Image',
+ 'url' => $contact['avatar']];
+
+ // tags: https://kitty.town/@inmysocks/100656097926961126.json
+ return $data;
+ }
+
+ public static function createActivityFromItem($item_id)
+ {
+ $item = Item::selectFirst([], ['id' => $item_id]);
+
+ $data = ['@context' => ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
+ ['Emoji' => 'toot:Emoji', 'Hashtag' => 'as:Hashtag', 'atomUri' => 'ostatus:atomUri',
+ 'conversation' => 'ostatus:conversation', 'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri',
+ 'ostatus' => 'http://ostatus.org#', 'sensitive' => 'as:sensitive',
+ 'toot' => 'http://joinmastodon.org/ns#']]];
+
+ $data['type'] = 'Create';
+ $data['id'] = $item['plink'];
+ $data['actor'] = $item['author-link'];
+ $data['to'] = 'https://www.w3.org/ns/activitystreams#Public';
+ $data['object'] = self::createNote($item);
+// print_r($data);
+// print_r($item);
+ return $data;
+ }
+
+ public static function createNote($item)
+ {
+ $data = [];
+ $data['type'] = 'Note';
+ $data['id'] = $item['plink'];
+ //$data['context'] = $data['conversation'] = $item['parent-uri'];
+ $data['actor'] = $item['author-link'];
+// if (!$item['private']) {
+// $data['to'] = [];
+// $data['to'][] = '"https://pleroma.soykaf.com/users/heluecht"';
+ $data['to'] = 'https://www.w3.org/ns/activitystreams#Public';
+// $data['cc'] = 'https://pleroma.soykaf.com/users/heluecht';
+// }
+ $data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
+ $data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
+ $data['attributedTo'] = $item['author-link'];
+ $data['title'] = BBCode::convert($item['title'], false, 7);
+ $data['content'] = BBCode::convert($item['body'], false, 7);
+ //$data['summary'] = '';
+ //$data['sensitive'] = false;
+ //$data['emoji'] = [];
+ //$data['tag'] = [];
+ //$data['attachment'] = [];
+ return $data;
+ }
+
+ /**
+ * Fetches ActivityPub content from the given url
+ *
+ * @param string $url content url
+ * @return array
+ */
+ public static function fetchContent($url)
+ {
+ $ret = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json']);
+
+ if (!$ret['success'] || empty($ret['body'])) {
+ return;
+ }
+
+ return json_decode($ret['body'], true);
+ }
+
+ /**
+ * Resolves the profile url from the address by using webfinger
+ *
+ * @param string $addr profile address (user@domain.tld)
+ * @return string url
+ */
+ private static function addrToUrl($addr)
+ {
+ $addr_parts = explode('@', $addr);
+ if (count($addr_parts) != 2) {
+ return false;
+ }
+
+ $webfinger = 'https://' . $addr_parts[1] . '/.well-known/webfinger?resource=acct:' . urlencode($addr);
+
+ $ret = Network::curl($webfinger, false, $redirects, ['accept_content' => 'application/jrd+json,application/json']);
+ if (!$ret['success'] || empty($ret['body'])) {
+ return false;
+ }
+
+ $data = json_decode($ret['body'], true);
+
+ if (empty($data['links'])) {
+ return false;
+ }
+
+ foreach ($data['links'] as $link) {
+ if (empty($link['href']) || empty($link['rel']) || empty($link['type'])) {
+ continue;
+ }
+
+ if (($link['rel'] == 'self') && ($link['type'] == 'application/activity+json')) {
+ return $link['href'];
+ }
+ }
+
+ return false;
+ }
+
+ /**
+ * Fetches a profile from the given url
+ *
+ * @param string $url profile url
+ * @return array
+ */
+ public static function fetchProfile($url)
+ {
+ if (empty(parse_url($url, PHP_URL_SCHEME))) {
+ $url = self::addrToUrl($url);
+ if (empty($url)) {
+ return false;
+ }
+ }
+
+ $data = self::fetchContent($url);
+
+ if (empty($data) || empty($data['id']) || empty($data['inbox'])) {
+ return false;
+ }
+
+ $profile = ['network' => Protocol::ACTIVITYPUB];
+ $profile['nick'] = $data['preferredUsername'];
+ $profile['name'] = defaults($data, 'name', $profile['nick']);
+ $profile['guid'] = defaults($data, 'uuid', null);
+ $profile['url'] = $data['id'];
+ $profile['alias'] = self::processElement($data, 'url', 'href');
+
+ $parts = parse_url($profile['url']);
+ unset($parts['scheme']);
+ unset($parts['path']);
+ $profile['addr'] = $profile['nick'] . '@' . str_replace('//', '', Network::unparseURL($parts));
+
+ $profile['photo'] = self::processElement($data, 'icon', 'url');
+ $profile['about'] = defaults($data, 'summary', '');
+ $profile['batch'] = self::processElement($data, 'endpoints', 'sharedInbox');
+ $profile['pubkey'] = self::processElement($data, 'publicKey', 'publicKeyPem');
+ $profile['notify'] = $data['inbox'];
+ $profile['poll'] = $data['outbox'];
+
+ // Check if the address is resolvable
+ if (self::addrToUrl($profile['addr']) == $profile['url']) {
+ $parts = parse_url($profile['url']);
+ unset($parts['path']);
+ $profile['baseurl'] = Network::unparseURL($parts);
+ } else {
+ unset($profile['addr']);
+ }
+
+ if ($profile['url'] == $profile['alias']) {
+ unset($profile['alias']);
+ }
+
+ // Remove all "null" fields
+ foreach ($profile as $field => $content) {
+ if (is_null($content)) {
+ unset($profile[$field]);
+ }
+ }
+
+ // Handled
+ unset($data['id']);
+ unset($data['inbox']);
+ unset($data['outbox']);
+ unset($data['preferredUsername']);
+ unset($data['name']);
+ unset($data['summary']);
+ unset($data['url']);
+ unset($data['publicKey']);
+ unset($data['endpoints']);
+ unset($data['icon']);
+ unset($data['uuid']);
+
+ // To-Do
+ unset($data['type']);
+ unset($data['manuallyApprovesFollowers']);
+
+ // Unhandled
+ unset($data['@context']);
+ unset($data['tag']);
+ unset($data['attachment']);
+ unset($data['image']);
+ unset($data['nomadicLocations']);
+ unset($data['signature']);
+ unset($data['following']);
+ unset($data['followers']);
+ unset($data['featured']);
+ unset($data['movedTo']);
+ unset($data['liked']);
+ unset($data['sharedInbox']); // Misskey
+ unset($data['isCat']); // Misskey
+ unset($data['kroeg:blocks']); // Kroeg
+ unset($data['updated']); // Kroeg
+
+/* if (!empty($data)) {
+ print_r($data);
+ die();
+ }
+*/
+ return $profile;
+ }
+
+ public static function fetchOutbox($url)
+ {
+ $data = self::fetchContent($url);
+ if (empty($data)) {
+ return;
+ }
+
+ if (!empty($data['orderedItems'])) {
+ $items = $data['orderedItems'];
+ } elseif (!empty($data['first']['orderedItems'])) {
+ $items = $data['first']['orderedItems'];
+ } elseif (!empty($data['first'])) {
+ self::fetchOutbox($data['first']);
+ return;
+ } else {
+ $items = [];
+ }
+
+ foreach ($items as $activity) {
+ self::processActivity($activity, $url);
+ }
+ }
+
+ function processActivity($activity, $url)
+ {
+ if (empty($activity['type'])) {
+ return;
+ }
+
+ if (empty($activity['object'])) {
+ return;
+ }
+
+ if (empty($activity['actor'])) {
+ return;
+ }
+
+ $actor = self::processElement($activity, 'actor', 'id');
+ if (empty($actor)) {
+ return;
+ }
+
+ if (is_string($activity['object'])) {
+ $object_url = $activity['object'];
+ } elseif (!empty($activity['object']['id'])) {
+ $object_url = $activity['object']['id'];
+ } else {
+ return;
+ }
+
+ $receivers = self::getReceivers($activity);
+ if (empty($receivers)) {
+ return;
+ }
+
+ // ----------------------------------
+ // unhandled
+ unset($activity['@context']);
+ unset($activity['id']);
+
+ // Non standard
+ unset($activity['title']);
+ unset($activity['atomUri']);
+ unset($activity['context_id']);
+ unset($activity['statusnetConversationId']);
+
+ $structure = $activity;
+
+ // To-Do?
+ unset($activity['context']);
+ unset($activity['location']);
+
+ // handled
+ unset($activity['to']);
+ unset($activity['cc']);
+ unset($activity['bto']);
+ unset($activity['bcc']);
+ unset($activity['type']);
+ unset($activity['actor']);
+ unset($activity['object']);
+ unset($activity['published']);
+ unset($activity['updated']);
+ unset($activity['instrument']);
+ unset($activity['inReplyTo']);
+
+ if (!empty($activity)) {
+ echo "Activity\n";
+ print_r($activity);
+ die($url."\n");
+ }
+
+ $activity = $structure;
+ // ----------------------------------
+
+ $item = self::fetchObject($object_url, $url);
+ if (empty($item)) {
+ return;
+ }
+
+ $item = self::addActivityFields($item, $activity);
+
+ $item['owner'] = $actor;
+
+ $item['receiver'] = array_merge($item['receiver'], $receivers);
+
+ switch ($activity['type']) {
+ case 'Create':
+ case 'Update':
+ self::createItem($item);
+ break;
+
+ case 'Announce':
+ self::announceItem($item);
+ break;
+
+ case 'Like':
+ case 'Dislike':
+ self::activityItem($item);
+ break;
+
+ case 'Follow':
+ break;
+
+ default:
+ echo "Unknown activity: ".$activity['type']."\n";
+ print_r($item);
+ die();
+ break;
+ }
+ }
+
+ private static function getReceivers($activity)
+ {
+ $receivers = [];
+
+ $elements = ['to', 'cc', 'bto', 'bcc'];
+ foreach ($elements as $element) {
+ if (empty($activity[$element])) {
+ continue;
+ }
+
+ // The receiver can be an arror or a string
+ if (is_string($activity[$element])) {
+ $activity[$element] = [$activity[$element]];
+ }
+
+ foreach ($activity[$element] as $receiver) {
+ if ($receiver == self::PUBLIC) {
+ $receivers[$receiver] = 0;
+ }
+
+ $condition = ['self' => true, 'nurl' => normalise_link($receiver)];
+ $contact = DBA::selectFirst('contact', ['id'], $condition);
+ if (!DBA::isResult($contact)) {
+ continue;
+ }
+ $receivers[$receiver] = $contact['id'];
+ }
+ }
+ return $receivers;
+ }
+
+ private static function addActivityFields($item, $activity)
+ {
+ if (!empty($activity['published']) && empty($item['published'])) {
+ $item['published'] = $activity['published'];
+ }
+
+ if (!empty($activity['updated']) && empty($item['updated'])) {
+ $item['updated'] = $activity['updated'];
+ }
+
+ if (!empty($activity['inReplyTo']) && empty($item['parent-uri'])) {
+ $item['parent-uri'] = self::processElement($activity, 'inReplyTo', 'id');
+ }
+
+ if (!empty($activity['instrument'])) {
+ $item['service'] = self::processElement($activity, 'instrument', 'name', 'Service');
+ }
+
+ // Remove all "null" fields
+ foreach ($item as $field => $content) {
+ if (is_null($content)) {
+ unset($item[$field]);
+ }
+ }
+
+ return $item;
+ }
+
+ private static function fetchObject($object_url, $url)
+ {
+ $data = self::fetchContent($object_url);
+ if (empty($data)) {
+ return false;
+ }
+
+ if (empty($data['type'])) {
+ return false;
+ } else {
+ $type = $data['type'];
+ }
+
+ if (in_array($type, ['Note', 'Article', 'Video'])) {
+ $common = self::processCommonData($data, $url);
+ }
+
+ switch ($type) {
+ case 'Note':
+ return array_merge($common, self::processNote($data, $url));
+ case 'Article':
+ return array_merge($common, self::processArticle($data, $url));
+ case 'Video':
+ return array_merge($common, self::processVideo($data, $url));
+
+ case 'Announce':
+ if (empty($data['object'])) {
+ return false;
+ }
+ return self::fetchObject($data['object'], $url);
+
+ case 'Person':
+ case 'Tombstone':
+ break;
+
+ default:
+ echo "Unknown object type: ".$data['type']."\n";
+ print_r($data);
+ die($url."\n");
+ break;
+ }
+ }
+
+ private static function processCommonData(&$object, $url)
+ {
+ if (empty($object['id']) || empty($object['attributedTo'])) {
+ return false;
+ }
+
+ $item = [];
+ $item['uri'] = $object['id'];
+
+ if (!empty($object['inReplyTo'])) {
+ $item['reply-to-uri'] = self::processElement($object, 'inReplyTo', 'id');
+ } else {
+ $item['reply-to-uri'] = $item['uri'];
+ }
+
+ $item['published'] = defaults($object, 'published', null);
+ $item['updated'] = defaults($object, 'updated', $item['published']);
+
+ if (empty($item['published']) && !empty($item['updated'])) {
+ $item['published'] = $item['updated'];
+ }
+
+ $item['uuid'] = defaults($object, 'uuid', null);
+ $item['owner'] = $item['author'] = self::processElement($object, 'attributedTo', 'id');
+ $item['context'] = defaults($object, 'context', null);
+ $item['conversation'] = defaults($object, 'conversation', null);
+ $item['sensitive'] = defaults($object, 'sensitive', null);
+ $item['name'] = defaults($object, 'name', null);
+ $item['title'] = defaults($object, 'title', null);
+ $item['content'] = defaults($object, 'content', null);
+ $item['summary'] = defaults($object, 'summary', null);
+ $item['location'] = self::processElement($object, 'location', 'name', 'Place');
+ $item['attachments'] = defaults($object, 'attachment', null);
+ $item['tags'] = defaults($object, 'tag', null);
+ $item['service'] = self::processElement($object, 'instrument', 'name', 'Service');
+ $item['alternate-url'] = self::processElement($object, 'url', 'href');
+ $item['receiver'] = self::getReceivers($object);
+
+ // handled
+ unset($object['id']);
+ unset($object['inReplyTo']);
+ unset($object['published']);
+ unset($object['updated']);
+ unset($object['uuid']);
+ unset($object['attributedTo']);
+ unset($object['context']);
+ unset($object['conversation']);
+ unset($object['sensitive']);
+ unset($object['name']);
+ unset($object['title']);
+ unset($object['content']);
+ unset($object['summary']);
+ unset($object['location']);
+ unset($object['attachment']);
+ unset($object['tag']);
+ unset($object['instrument']);
+ unset($object['url']);
+ unset($object['to']);
+ unset($object['cc']);
+ unset($object['bto']);
+ unset($object['bcc']);
+
+ // To-Do
+ unset($object['source']);
+
+ // Unhandled
+ unset($object['@context']);
+ unset($object['type']);
+ unset($object['actor']);
+ unset($object['signature']);
+ unset($object['mediaType']);
+ unset($object['duration']);
+ unset($object['replies']);
+ unset($object['icon']);
+
+ /*
+ audience, preview, endTime, startTime, generator, image
+ */
+
+ return $item;
+ }
+
+ private static function processNote($object, $url)
+ {
+ $item = [];
+
+ // To-Do?
+ unset($object['emoji']);
+ unset($object['atomUri']);
+ unset($object['inReplyToAtomUri']);
+
+ // Unhandled
+ unset($object['contentMap']);
+ unset($object['announcement_count']);
+ unset($object['announcements']);
+ unset($object['context_id']);
+ unset($object['likes']);
+ unset($object['like_count']);
+ unset($object['inReplyToStatusId']);
+ unset($object['shares']);
+ unset($object['quoteUrl']);
+ unset($object['statusnetConversationId']);
+
+ if (empty($object))
+ return $item;
+
+ echo "Unknown Note\n";
+ print_r($object);
+ print_r($item);
+ die($url."\n");
+
+ return [];
+ }
+
+ private static function processArticle($object, $url)
+ {
+ $item = [];
+
+ if (empty($object))
+ return $item;
+
+ echo "Unknown Article\n";
+ print_r($object);
+ print_r($item);
+ die($url."\n");
+
+ return [];
+ }
+
+ private static function processVideo($object, $url)
+ {
+ $item = [];
+
+ // To-Do?
+ unset($object['category']);
+ unset($object['licence']);
+ unset($object['language']);
+ unset($object['commentsEnabled']);
+
+ // Unhandled
+ unset($object['views']);
+ unset($object['waitTranscoding']);
+ unset($object['state']);
+ unset($object['support']);
+ unset($object['subtitleLanguage']);
+ unset($object['likes']);
+ unset($object['dislikes']);
+ unset($object['shares']);
+ unset($object['comments']);
+
+ if (empty($object))
+ return $item;
+
+ echo "Unknown Video\n";
+ print_r($object);
+ print_r($item);
+ die($url."\n");
+
+ return [];
+ }
+
+ private static function processElement($array, $element, $key, $type = null)
+ {
+ if (empty($array)) {
+ return false;
+ }
+
+ if (empty($array[$element])) {
+ return false;
+ }
+
+ if (is_string($array[$element])) {
+ return $array[$element];
+ }
+
+ if (is_null($type)) {
+ if (!empty($array[$element][$key])) {
+ return $array[$element][$key];
+ }
+
+ if (!empty($array[$element][0][$key])) {
+ return $array[$element][0][$key];
+ }
+
+ return false;
+ }
+
+ if (!empty($array[$element][$key]) && !empty($array[$element]['type']) && ($array[$element]['type'] == $type)) {
+ return $array[$element][$key];
+ }
+
+ /// @todo Add array search
+
+ return false;
+ }
+
+ private static function createItem($item)
+ {
+// print_r($item);
+ }
+
+ private static function announceItem($item)
+ {
+// print_r($item);
+ }
+
+ private static function activityItem($item)
+ {
+ // print_r($item);
+ }
+
+}
projects / friendica.git / commitdiff