Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?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\Conversation;
use Friendica\Model\Contact;
use Friendica\Model\APContact;
use Friendica\Model\Item;
use Friendica\Model\Profile;
use Friendica\Model\Term;
use Friendica\Model\User;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Crypto;
use Friendica\Content\Text\BBCode;
use Friendica\Content\Text\HTML;
use Friendica\Util\JsonLD;
use Friendica\Util\LDSignature;
use Friendica\Core\Config;
/**
* @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/
*
* Digest: https://tools.ietf.org/html/rfc5843
* https://tools.ietf.org/html/draft-cavage-http-signatures-10#ref-15
*
* Mastodon implementation of supported activities:
* https://github.com/tootsuite/mastodon/blob/master/app/lib/activitypub/activity.rb#L26
*
* To-do:
*
* Receiver:
* - Update Note
* - Delete Note
* - Delete Person
* - Undo Announce
* - Reject Follow
* - Undo Accept
* - Undo Follow
* - Add
* - Create Image
* - Create Video
* - Event
* - Remove
* - Block
* - Flag
*
* Transmitter:
* - Announce
* - Undo Announce
* - Update Person
* - Reject Follow
* - Event
*
* General:
* - Attachments
* - nsfw (sensitive)
* - Queueing unsucessful deliveries
* - Polling the outboxes for missing content?
* - Possibly using the LD-JSON parser
*/
class ActivityPub
{
const PUBLIC = 'https://www.w3.org/ns/activitystreams#Public';
const CONTEXT = ['https://www.w3.org/ns/activitystreams', 'https://w3id.org/security/v1',
['vcard' => 'http://www.w3.org/2006/vcard/ns#',
'diaspora' => 'https://diasporafoundation.org/ns/',
'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
'sensitive' => 'as:sensitive', 'Hashtag' => 'as:Hashtag']];
/**
* @brief Checks if the web request is done for the AP protocol
*
* @return is it AP?
*/
public static function isRequest()
{
return stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/activity+json') ||
stristr(defaults($_SERVER, 'HTTP_ACCEPT', ''), 'application/ld+json');
}
/**
* @brief collects the lost of followers of the given owner
*
* @param array $owner Owner array
* @param integer $page Page number
*
* @return array of owners
*/
public static function getFollowers($owner, $page = null)
{
$condition = ['rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
$count = DBA::count('contact', $condition);
$data = ['@context' => self::CONTEXT];
$data['id'] = System::baseUrl() . '/followers/' . $owner['nickname'];
$data['type'] = 'OrderedCollection';
$data['totalItems'] = $count;
// When we hide our friends we will only show the pure number but don't allow more.
$profile = Profile::getProfileForUser($owner['uid']);
if (!empty($profile['hide-friends'])) {
return $data;
}
if (empty($page)) {
$data['first'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=1';
} else {
$list = [];
$contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
while ($contact = DBA::fetch($contacts)) {
$list[] = $contact['url'];
}
if (!empty($list)) {
$data['next'] = System::baseUrl() . '/followers/' . $owner['nickname'] . '?page=' . ($page + 1);
}
$data['partOf'] = System::baseUrl() . '/followers/' . $owner['nickname'];
$data['orderedItems'] = $list;
}
return $data;
}
/**
* @brief Create list of following contacts
*
* @param array $owner Owner array
* @param integer $page Page numbe
*
* @return array of following contacts
*/
public static function getFollowing($owner, $page = null)
{
$condition = ['rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::NATIVE_SUPPORT, 'uid' => $owner['uid'],
'self' => false, 'hidden' => false, 'archive' => false, 'pending' => false];
$count = DBA::count('contact', $condition);
$data = ['@context' => self::CONTEXT];
$data['id'] = System::baseUrl() . '/following/' . $owner['nickname'];
$data['type'] = 'OrderedCollection';
$data['totalItems'] = $count;
// When we hide our friends we will only show the pure number but don't allow more.
$profile = Profile::getProfileForUser($owner['uid']);
if (!empty($profile['hide-friends'])) {
return $data;
}
if (empty($page)) {
$data['first'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=1';
} else {
$list = [];
$contacts = DBA::select('contact', ['url'], $condition, ['limit' => [($page - 1) * 100, 100]]);
while ($contact = DBA::fetch($contacts)) {
$list[] = $contact['url'];
}
if (!empty($list)) {
$data['next'] = System::baseUrl() . '/following/' . $owner['nickname'] . '?page=' . ($page + 1);
}
$data['partOf'] = System::baseUrl() . '/following/' . $owner['nickname'];
$data['orderedItems'] = $list;
}
return $data;
}
/**
* @brief Public posts for the given owner
*
* @param array $owner Owner array
* @param integer $page Page numbe
*
* @return array of posts
*/
public static function getOutbox($owner, $page = null)
{
$public_contact = Contact::getIdForURL($owner['url'], 0, true);
$condition = ['uid' => $owner['uid'], 'contact-id' => $owner['id'], 'author-id' => $public_contact,
'wall' => true, 'private' => false, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT],
'deleted' => false, 'visible' => true];
$count = DBA::count('item', $condition);
$data = ['@context' => self::CONTEXT];
$data['id'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
$data['type'] = 'OrderedCollection';
$data['totalItems'] = $count;
if (empty($page)) {
$data['first'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=1';
} else {
$list = [];
$condition['parent-network'] = Protocol::NATIVE_SUPPORT;
$items = Item::select(['id'], $condition, ['limit' => [($page - 1) * 20, 20], 'order' => ['created' => true]]);
while ($item = Item::fetch($items)) {
$object = self::createObjectFromItemID($item['id']);
unset($object['@context']);
$list[] = $object;
}
if (!empty($list)) {
$data['next'] = System::baseUrl() . '/outbox/' . $owner['nickname'] . '?page=' . ($page + 1);
}
$data['partOf'] = System::baseUrl() . '/outbox/' . $owner['nickname'];
$data['orderedItems'] = $list;
}
return $data;
}
/**
* Return the ActivityPub profile of the given user
*
* @param integer $uid User ID
* @return profile array
*/
public static function profile($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', 'page-flags'];
$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' => self::CONTEXT];
$data['id'] = $contact['url'];
$data['diaspora:guid'] = $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' => 'vcard:Home', 'vcard:country-name' => $profile['country-name'],
'vcard:region' => $profile['region'], 'vcard:locality' => $profile['locality']];
$data['summary'] = $contact['about'];
$data['url'] = $contact['url'];
$data['manuallyApprovesFollowers'] = in_array($user['page-flags'], [Contact::PAGE_NORMAL, Contact::PAGE_PRVGROUP]);
$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;
}
/**
* @brief Returns an array with permissions of a given item array
*
* @param array $item
*
* @return array with permissions
*/
private static function fetchPermissionBlockFromConversation($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');
$profile = APContact::getProfileByURL($actor);
$item_profile = APContact::getProfileByURL($item['author-link']);
$exclude[] = $item['author-link'];
if ($item['gravity'] == GRAVITY_PARENT) {
$exclude[] = $item['owner-link'];
}
$permissions['to'][] = $actor;
$elements = ['to', 'cc', 'bto', 'bcc'];
foreach ($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 = $item_profile['followers'];
}
if (!in_array($receiver, $exclude)) {
$permissions[$element][] = $receiver;
}
}
}
return $permissions;
}
/**
* @brief Creates an array of permissions from an item thread
*
* @param array $item
*
* @return permission array
*/
public static function createPermissionBlockForItem($item)
{
$data = ['to' => [], 'cc' => []];
$data = array_merge($data, self::fetchPermissionBlockFromConversation($item));
$actor_profile = APContact::getProfileByURL($item['author-link']);
$terms = Term::tagArrayFromItemId($item['id']);
$contacts[$item['author-link']] = $item['author-link'];
if (!$item['private']) {
$data['to'][] = self::PUBLIC;
if (!empty($actor_profile['followers'])) {
$data['cc'][] = $actor_profile['followers'];
}
foreach ($terms as $term) {
if ($term['type'] != TERM_MENTION) {
continue;
}
$profile = APContact::getProfileByURL($term['url'], false);
if (!empty($profile) && empty($contacts[$profile['url']])) {
$data['cc'][] = $profile['url'];
$contacts[$profile['url']] = $profile['url'];
}
}
} else {
$receiver_list = Item::enumeratePermissions($item);
$mentioned = [];
foreach ($terms as $term) {
if ($term['type'] != TERM_MENTION) {
continue;
}
$cid = Contact::getIdForURL($term['url'], $item['uid']);
if (!empty($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' => $receiver, 'network' => Protocol::ACTIVITYPUB]);
if (empty($contacts[$contact['url']])) {
$data['cc'][] = $contact['url'];
$contacts[$contact['url']] = $contact['url'];
}
}
}
$parents = Item::select(['id', 'author-link', 'owner-link', 'gravity'], ['parent' => $item['parent']]);
while ($parent = Item::fetch($parents)) {
// Don't include data from future posts
if ($parent['id'] >= $item['id']) {
continue;
}
$profile = APContact::getProfileByURL($parent['author-link'], false);
if (!empty($profile) && empty($contacts[$profile['url']])) {
$data['cc'][] = $profile['url'];
$contacts[$profile['url']] = $profile['url'];
}
if ($item['gravity'] != GRAVITY_PARENT) {
continue;
}
$profile = APContact::getProfileByURL($parent['owner-link'], false);
if (!empty($profile) && empty($contacts[$profile['url']])) {
$data['cc'][] = $profile['url'];
$contacts[$profile['url']] = $profile['url'];
}
}
DBA::close($parents);
if (empty($data['to'])) {
$data['to'] = $data['cc'];
$data['cc'] = [];
}
return $data;
}
/**
* @brief Fetches an array of inboxes for the given item and user
*
* @param array $item
* @param integer $uid User ID
*
* @return array with inboxes
*/
public static function fetchTargetInboxes($item, $uid)
{
$permissions = self::createPermissionBlockForItem($item);
if (empty($permissions)) {
return [];
}
$inboxes = [];
if ($item['gravity'] == GRAVITY_ACTIVITY) {
$item_profile = APContact::getProfileByURL($item['author-link']);
} else {
$item_profile = APContact::getProfileByURL($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' => $uid,
'rel' => [Contact::FOLLOWER, Contact::FRIEND], 'network' => Protocol::ACTIVITYPUB,
'archive' => false, 'pending' => false]);
while ($contact = DBA::fetch($contacts)) {
$contact = defaults($contact, 'batch', $contact['notify']);
$inboxes[$contact] = $contact;
}
DBA::close($contacts);
} else {
$profile = APContact::getProfileByURL($receiver);
if (!empty($profile)) {
$target = defaults($profile, 'sharedinbox', $profile['inbox']);
$inboxes[$target] = $target;
}
}
}
}
return $inboxes;
}
/**
* @brief Returns the activity type of a given item
*
* @param array $item
*
* @return activity type
*/
public static function getTypeOfItem($item)
{
if ($item['verb'] == ACTIVITY_POST) {
if ($item['created'] == $item['edited']) {
$type = 'Create';
} else {
$type = 'Update';
}
} elseif ($item['verb'] == ACTIVITY_LIKE) {
$type = 'Like';
} elseif ($item['verb'] == ACTIVITY_DISLIKE) {
$type = 'Dislike';
} elseif ($item['verb'] == ACTIVITY_ATTEND) {
$type = 'Accept';
} elseif ($item['verb'] == ACTIVITY_ATTENDNO) {
$type = 'Reject';
} elseif ($item['verb'] == ACTIVITY_ATTENDMAYBE) {
$type = 'TentativeAccept';
} else {
$type = '';
}
return $type;
}
/**
* @brief Creates an activity array for a given item id
*
* @param integer $item_id
* @param boolean $object_mode Is the activity item is used inside another object?
*
* @return array of activity
*/
public static function createActivityFromItem($item_id, $object_mode = false)
{
$item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
if (!DBA::isResult($item)) {
return false;
}
$condition = ['item-uri' => $item['uri'], 'protocol' => Conversation::PARCEL_ACTIVITYPUB];
$conversation = DBA::selectFirst('conversation', ['source'], $condition);
if (DBA::isResult($conversation)) {
$data = json_decode($conversation['source']);
if (!empty($data)) {
return $data;
}
}
$type = self::getTypeOfItem($item);
if (!$object_mode) {
$data = ['@context' => self::CONTEXT];
if ($item['deleted'] && ($item['gravity'] == GRAVITY_ACTIVITY)) {
$type = 'Undo';
} elseif ($item['deleted']) {
$type = 'Delete';
}
} else {
$data = [];
}
$data['id'] = $item['uri'] . '#' . $type;
$data['type'] = $type;
$data['actor'] = $item['author-link'];
$data['published'] = DateTimeFormat::utc($item["created"]."+00:00", DateTimeFormat::ATOM);
if ($item["created"] != $item["edited"]) {
$data['updated'] = DateTimeFormat::utc($item["edited"]."+00:00", DateTimeFormat::ATOM);
}
$data['context'] = self::fetchContextURLForItem($item);
$data = array_merge($data, ActivityPub::createPermissionBlockForItem($item));
if (in_array($data['type'], ['Create', 'Update', 'Announce', 'Delete'])) {
$data['object'] = self::createNote($item);
} elseif ($data['type'] == 'Undo') {
$data['object'] = self::createActivityFromItem($item_id, true);
} else {
$data['object'] = $item['thr-parent'];
}
$owner = User::getOwnerDataById($item['uid']);
if (!$object_mode) {
return LDSignature::sign($data, $owner);
} else {
return $data;
}
}
/**
* @brief Creates an object array for a given item id
*
* @param integer $item_id
*
* @return object array
*/
public static function createObjectFromItemID($item_id)
{
$item = Item::selectFirst([], ['id' => $item_id, 'parent-network' => Protocol::NATIVE_SUPPORT]);
if (!DBA::isResult($item)) {
return false;
}
$data = ['@context' => self::CONTEXT];
$data = array_merge($data, self::createNote($item));
return $data;
}
/**
* @brief Returns a tag array for a given item array
*
* @param array $item
*
* @return array of tags
*/
private static function createTagList($item)
{
$tags = [];
$terms = Term::tagArrayFromItemId($item['id']);
foreach ($terms as $term) {
if ($term['type'] == TERM_MENTION) {
$contact = Contact::getDetailsByURL($term['url']);
if (!empty($contact['addr'])) {
$mention = '@' . $contact['addr'];
} else {
$mention = '@' . $term['url'];
}
$tags[] = ['type' => 'Mention', 'href' => $term['url'], 'name' => $mention];
}
}
return $tags;
}
/**
* @brief Fetches the "context" value for a givem item array from the "conversation" table
*
* @param array $item
*
* @return string with context url
*/
private static function fetchContextURLForItem($item)
{
$conversation = DBA::selectFirst('conversation', ['conversation-href', 'conversation-uri'], ['item-uri' => $item['parent-uri']]);
if (DBA::isResult($conversation) && !empty($conversation['conversation-href'])) {
$context_uri = $conversation['conversation-href'];
} elseif (DBA::isResult($conversation) && !empty($conversation['conversation-uri'])) {
$context_uri = $conversation['conversation-uri'];
} else {
$context_uri = str_replace('/object/', '/context/', $item['parent-uri']);
}
return $context_uri;
}
/**
* @brief Creates a note/article object array
*
* @param array $item
*
* @return object array
*/
private static function createNote($item)
{
if (!empty($item['title'])) {
$type = 'Article';
} else {
$type = 'Note';
}
if ($item['deleted']) {
$type = 'Tombstone';
}
$data = [];
$data['id'] = $item['uri'];
$data['type'] = $type;
if ($item['deleted']) {
return $data;
}
$data['summary'] = null; // Ignore by now
if ($item['uri'] != $item['thr-parent']) {
$data['inReplyTo'] = $item['thr-parent'];
} else {
$data['inReplyTo'] = null;
}
$data['diaspora:guid'] = $item['guid'];
$data['published'] = DateTimeFormat::utc($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['actor'] = $item['author-link'];
$data['sensitive'] = false; // - Query NSFW
$data['context'] = self::fetchContextURLForItem($item);
if (!empty($item['title'])) {
$data['name'] = BBCode::convert($item['title'], false, 7);
}
$data['content'] = BBCode::convert($item['body'], false, 7);
$data['source'] = ['content' => $item['body'], 'mediaType' => "text/bbcode"];
if (!empty($item['signed_text']) && ($item['uri'] != $item['thr-parent'])) {
$data['diaspora:comment'] = $item['signed_text'];
}
$data['attachment'] = []; // @ToDo
$data['tag'] = self::createTagList($item);
$data = array_merge($data, ActivityPub::createPermissionBlockForItem($item));
return $data;
}
/**
* @brief Transmits a given activity to a target
*
* @param array $activity
* @param string $target Target profile
* @param integer $uid User ID
*/
public static function transmitActivity($activity, $target, $uid)
{
$profile = APContact::getProfileByURL($target);
$owner = User::getOwnerDataById($uid);
$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
'id' => System::baseUrl() . '/activity/' . System::createGUID(),
'type' => $activity,
'actor' => $owner['url'],
'object' => $profile['url'],
'to' => $profile['url']];
logger('Sending activity ' . $activity . ' to ' . $target . ' for user ' . $uid, LOGGER_DEBUG);
$signed = LDSignature::sign($data, $owner);
HTTPSignature::transmit($signed, $profile['inbox'], $uid);
}
/**
* @brief Transmit a message that the contact request had been accepted
*
* @param string $target Target profile
* @param $id
* @param integer $uid User ID
*/
public static function transmitContactAccept($target, $id, $uid)
{
$profile = APContact::getProfileByURL($target);
$owner = User::getOwnerDataById($uid);
$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
'id' => System::baseUrl() . '/activity/' . System::createGUID(),
'type' => 'Accept',
'actor' => $owner['url'],
'object' => ['id' => $id, 'type' => 'Follow',
'actor' => $profile['url'],
'object' => $owner['url']],
'to' => $profile['url']];
logger('Sending accept to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
$signed = LDSignature::sign($data, $owner);
HTTPSignature::transmit($signed, $profile['inbox'], $uid);
}
/**
* @brief
*
* @param string $target Target profile
* @param $id
* @param integer $uid User ID
*/
public static function transmitContactReject($target, $id, $uid)
{
$profile = APContact::getProfileByURL($target);
$owner = User::getOwnerDataById($uid);
$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
'id' => System::baseUrl() . '/activity/' . System::createGUID(),
'type' => 'Reject',
'actor' => $owner['url'],
'object' => ['id' => $id, 'type' => 'Follow',
'actor' => $profile['url'],
'object' => $owner['url']],
'to' => $profile['url']];
logger('Sending reject to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
$signed = LDSignature::sign($data, $owner);
HTTPSignature::transmit($signed, $profile['inbox'], $uid);
}
/**
* @brief
*
* @param string $target Target profile
* @param integer $uid User ID
*/
public static function transmitContactUndo($target, $uid)
{
$profile = APContact::getProfileByURL($target);
$id = System::baseUrl() . '/activity/' . System::createGUID();
$owner = User::getOwnerDataById($uid);
$data = ['@context' => 'https://www.w3.org/ns/activitystreams',
'id' => $id,
'type' => 'Undo',
'actor' => $owner['url'],
'object' => ['id' => $id, 'type' => 'Follow',
'actor' => $owner['url'],
'object' => $profile['url']],
'to' => $profile['url']];
logger('Sending undo to ' . $target . ' for user ' . $uid . ' with id ' . $id, LOGGER_DEBUG);
$signed = LDSignature::sign($data, $owner);
HTTPSignature::transmit($signed, $profile['inbox'], $uid);
}
/**
* Fetches ActivityPub content from the given url
*
* @param string $url content url
* @return array
*/
public static function fetchContent($url)
{
$ret = Network::curl($url, false, $redirects, ['accept_content' => 'application/activity+json, application/ld+json']);
if (!$ret['success'] || empty($ret['body'])) {
return;
}
return json_decode($ret['body'], true);
}
/**
* Fetches a profile from the given url into an array that is compatible to Probe::uri
*
* @param string $url profile url
* @return array
*/
public static function probeProfile($url)
{
$apcontact = APContact::getProfileByURL($url, true);
if (empty($apcontact)) {
return false;
}
$profile = ['network' => Protocol::ACTIVITYPUB];
$profile['nick'] = $apcontact['nick'];
$profile['name'] = $apcontact['name'];
$profile['guid'] = $apcontact['uuid'];
$profile['url'] = $apcontact['url'];
$profile['addr'] = $apcontact['addr'];
$profile['alias'] = $apcontact['alias'];
$profile['photo'] = $apcontact['photo'];
// $profile['community']
// $profile['keywords']
// $profile['location']
$profile['about'] = $apcontact['about'];
$profile['batch'] = $apcontact['sharedinbox'];
$profile['notify'] = $apcontact['inbox'];
$profile['poll'] = $apcontact['outbox'];
$profile['pubkey'] = $apcontact['pubkey'];
$profile['baseurl'] = $apcontact['baseurl'];
// Remove all "null" fields
foreach ($profile as $field => $content) {
if (is_null($content)) {
unset($profile[$field]);
}
}
return $profile;
}
/**
* @brief
*
* @param $body
* @param $header
* @param integer $uid User ID
*/
public static function processInbox($body, $header, $uid)
{
$http_signer = HTTPSignature::getSigner($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);
$actor = JsonLD::fetchElement($activity, 'actor', 'id');
logger('Message for user ' . $uid . ' is from actor ' . $actor, LOGGER_DEBUG);
if (empty($activity)) {
logger('Invalid body.', LOGGER_DEBUG);
return;
}
if (LDSignature::isSigned($activity)) {
$ld_signer = LDSignature::getSigner($activity);
if (empty($ld_signer)) {
logger('Invalid JSON-LD signature from ' . $actor, LOGGER_DEBUG);
}
if (!empty($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);
}
/**
* @brief
*
* @param $url
* @param integer $uid User ID
*/
public static function fetchOutbox($url, $uid)
{
$data = self::fetchContent($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'], $uid);
return;
} else {
$items = [];
}
foreach ($items as $activity) {
self::processActivity($activity, '', $uid, true);
}
}
/**
* @brief
*
* @param array $activity
* @param integer $uid User ID
* @param $trust_source
*
* @return
*/
private static function prepareObjectData($activity, $uid, &$trust_source)
{
$actor = JsonLD::fetchElement($activity, 'actor', 'id');
if (empty($actor)) {
logger('Empty actor', LOGGER_DEBUG);
return [];
}
// Fetch all receivers from to, cc, bto and bcc
$receivers = self::getReceivers($activity, $actor);
// When it is a delivery to a personal inbox we add that user to the receivers
if (!empty($uid)) {
$owner = User::getOwnerDataById($uid);
$additional = ['uid:' . $uid => $uid];
$receivers = array_merge($receivers, $additional);
}
logger('Receivers: ' . json_encode($receivers), LOGGER_DEBUG);
$object_id = JsonLD::fetchElement($activity, 'object', 'id');
if (empty($object_id)) {
logger('No object found', LOGGER_DEBUG);
return [];
}
// Fetch the content only on activities where this matters
if (in_array($activity['type'], ['Create', 'Announce'])) {
$object_data = self::fetchObject($object_id, $activity['object'], $trust_source);
if (empty($object_data)) {
logger("Object data couldn't be processed", LOGGER_DEBUG);
return [];
}
// We had been able to retrieve the object data - so we can trust the source
$trust_source = true;
} elseif (in_array($activity['type'], ['Like', 'Dislike'])) {
// Create a mostly empty array out of the activity data (instead of the object).
// This way we later don't have to check for the existence of ech individual array element.
$object_data = self::processObject($activity);
$object_data['name'] = $activity['type'];
$object_data['author'] = $activity['actor'];
$object_data['object'] = $object_id;
$object_data['object_type'] = ''; // Since we don't fetch the object, we don't know the type
} else {
$object_data = [];
$object_data['id'] = $activity['id'];
$object_data['object'] = $activity['object'];
$object_data['object_type'] = JsonLD::fetchElement($activity, 'object', 'type');
}
$object_data = self::addActivityFields($object_data, $activity);
$object_data['type'] = $activity['type'];
$object_data['owner'] = $actor;
$object_data['receiver'] = array_merge(defaults($object_data, 'receiver', []), $receivers);
logger('Processing ' . $object_data['type'] . ' ' . $object_data['object_type'] . ' ' . $object_data['id'], LOGGER_DEBUG);
return $object_data;
}
/**
* @brief
*
* @param array $activity
* @param $body
* @param integer $uid User ID
* @param $trust_source
*/
private static function processActivity($activity, $body = '', $uid = null, $trust_source = false)
{
if (empty($activity['type'])) {
logger('Empty type', LOGGER_DEBUG);
return;
}
if (empty($activity['object'])) {
logger('Empty object', LOGGER_DEBUG);
return;
}
if (empty($activity['actor'])) {
logger('Empty actor', LOGGER_DEBUG);
return;
}
// $trust_source is called by reference and is set to true if the content was retrieved successfully
$object_data = self::prepareObjectData($activity, $uid, $trust_source);
if (empty($object_data)) {
logger('No object data found', LOGGER_DEBUG);
return;
}
if (!$trust_source) {
logger('No trust for activity type "' . $activity['type'] . '", so we quit now.', LOGGER_DEBUG);
}
switch ($activity['type']) {
case 'Create':
case 'Announce':
self::createItem($object_data, $body);
break;
case 'Like':
self::likeItem($object_data, $body);
break;
case 'Dislike':
self::dislikeItem($object_data, $body);
break;
case 'Update':
if (in_array($object_data['object_type'], ['Person', 'Organization', 'Service', 'Group', 'Application'])) {
self::updatePerson($object_data, $body);
}
break;
case 'Delete':
break;
case 'Follow':
self::followUser($object_data);
break;
case 'Accept':
if ($object_data['object_type'] == 'Follow') {
self::acceptFollowUser($object_data);
}
break;
case 'Undo':
if ($object_data['object_type'] == 'Follow') {
self::undoFollowUser($object_data);
} elseif (in_array($object_data['object_type'], ['Like', 'Dislike', 'Accept', 'Reject', 'TentativeAccept'])) {
self::undoActivity($object_data);
}
break;
default:
logger('Unknown activity: ' . $activity['type'], LOGGER_DEBUG);
break;
}
}
/**
* @brief
*
* @param array $activity
* @param $actor
*
* @return
*/
private static function getReceivers($activity, $actor)
{
$receivers = [];
// When it is an answer, we inherite the receivers from the parent
$replyto = JsonLD::fetchElement($activity, 'inReplyTo', 'id');
if (!empty($replyto)) {
$parents = Item::select(['uid'], ['uri' => $replyto]);
while ($parent = Item::fetch($parents)) {
$receivers['uid:' . $parent['uid']] = $parent['uid'];
}
}
if (!empty($actor)) {
$profile = APContact::getProfileByURL($actor);
$followers = defaults($profile, 'followers', '');
logger('Actor: ' . $actor . ' - Followers: ' . $followers, LOGGER_DEBUG);
} else {
logger('Empty actor', LOGGER_DEBUG);
$followers = '';
}
$elements = ['to', 'cc', 'bto', 'bcc'];
foreach ($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) {
$receivers['uid:0'] = 0;
}
if (($receiver == self::PUBLIC) && !empty($actor)) {
// This will most likely catch all OStatus connections to Mastodon
$condition = ['alias' => [$actor, normalise_link($actor)], 'rel' => [Contact::SHARING, Contact::FRIEND]
, 'archive' => false, 'pending' => false];
$contacts = DBA::select('contact', ['uid'], $condition);
while ($contact = DBA::fetch($contacts)) {
if ($contact['uid'] != 0) {
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
DBA::close($contacts);
}
if (in_array($receiver, [$followers, self::PUBLIC]) && !empty($actor)) {
$condition = ['nurl' => normalise_link($actor), 'rel' => [Contact::SHARING, Contact::FRIEND],
'network' => Protocol::ACTIVITYPUB, 'archive' => false, 'pending' => false];
$contacts = DBA::select('contact', ['uid'], $condition);
while ($contact = DBA::fetch($contacts)) {
if ($contact['uid'] != 0) {
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
DBA::close($contacts);
continue;
}
$condition = ['self' => true, 'nurl' => normalise_link($receiver)];
$contact = DBA::selectFirst('contact', ['uid'], $condition);
if (!DBA::isResult($contact)) {
continue;
}
$receivers['uid:' . $contact['uid']] = $contact['uid'];
}
}
self::switchContacts($receivers, $actor);
return $receivers;
}
/**
* @brief
*
* @param $cid
* @param integer $uid User ID
* @param $url
*/
private static function switchContact($cid, $uid, $url)
{
$profile = ActivityPub::probeProfile($url);
if (empty($profile)) {
return;
}
logger('Switch contact ' . $cid . ' (' . $profile['url'] . ') for user ' . $uid . ' from OStatus to ActivityPub');
$photo = $profile['photo'];
unset($profile['photo']);
unset($profile['baseurl']);
$profile['nurl'] = normalise_link($profile['url']);
DBA::update('contact', $profile, ['id' => $cid]);
Contact::updateAvatar($photo, $uid, $cid);
}
/**
* @brief
*
* @param $receivers
* @param $actor
*/
private static function switchContacts($receivers, $actor)
{
if (empty($actor)) {
return;
}
foreach ($receivers as $receiver) {
$contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver, 'network' => Protocol::OSTATUS, 'nurl' => normalise_link($actor)]);
if (DBA::isResult($contact)) {
self::switchContact($contact['id'], $receiver, $actor);
}
$contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver, 'network' => Protocol::OSTATUS, 'alias' => [normalise_link($actor), $actor]]);
if (DBA::isResult($contact)) {
self::switchContact($contact['id'], $receiver, $actor);
}
}
}
/**
* @brief
*
* @param $object_data
* @param array $activity
*
* @return
*/
private static function addActivityFields($object_data, $activity)
{
if (!empty($activity['published']) && empty($object_data['published'])) {
$object_data['published'] = $activity['published'];
}
if (!empty($activity['updated']) && empty($object_data['updated'])) {
$object_data['updated'] = $activity['updated'];
}
if (!empty($activity['inReplyTo']) && empty($object_data['parent-uri'])) {
$object_data['parent-uri'] = JsonLD::fetchElement($activity, 'inReplyTo', 'id');
}
if (!empty($activity['instrument'])) {
$object_data['service'] = JsonLD::fetchElement($activity, 'instrument', 'name', 'type', 'Service');
}
return $object_data;
}
/**
* @brief
*
* @param $object_id
* @param $object
* @param $trust_source
*
* @return
*/
private static function fetchObject($object_id, $object = [], $trust_source = false)
{
if (!$trust_source || is_string($object)) {
$data = self::fetchContent($object_id);
if (empty($data)) {
logger('Empty content for ' . $object_id . ', check if content is available locally.', LOGGER_DEBUG);
$data = $object_id;
} else {
logger('Fetched content for ' . $object_id, LOGGER_DEBUG);
}
} else {
logger('Using original object for url ' . $object_id, LOGGER_DEBUG);
$data = $object;
}
if (is_string($data)) {
$item = Item::selectFirst([], ['uri' => $data]);
if (!DBA::isResult($item)) {
logger('Object with url ' . $data . ' was not found locally.', LOGGER_DEBUG);
return false;
}
logger('Using already stored item for url ' . $object_id, LOGGER_DEBUG);
$data = self::createNote($item);
}
if (empty($data['type'])) {
logger('Empty type', LOGGER_DEBUG);
return false;
}
switch ($data['type']) {
case 'Note':
case 'Article':
case 'Video':
return self::processObject($data);
case 'Announce':
if (empty($data['object'])) {
return false;
}
return self::fetchObject($data['object']);
case 'Person':
case 'Tombstone':
break;
default:
logger('Unknown object type: ' . $data['type'], LOGGER_DEBUG);
break;
}
}
/**
* @brief
*
* @param $object
*
* @return
*/
private static function processObject(&$object)
{
if (empty($object['id'])) {
return false;
}
$object_data = [];
$object_data['object_type'] = $object['type'];
$object_data['id'] = $object['id'];
if (!empty($object['inReplyTo'])) {
$object_data['reply-to-id'] = JsonLD::fetchElement($object, 'inReplyTo', 'id');
} else {
$object_data['reply-to-id'] = $object_data['id'];
}
$object_data['published'] = defaults($object, 'published', null);
$object_data['updated'] = defaults($object, 'updated', $object_data['published']);
if (empty($object_data['published']) && !empty($object_data['updated'])) {
$object_data['published'] = $object_data['updated'];
}
$actor = JsonLD::fetchElement($object, 'attributedTo', 'id');
if (empty($actor)) {
$actor = defaults($object, 'actor', null);
}
$object_data['diaspora:guid'] = defaults($object, 'diaspora:guid', null);
$object_data['owner'] = $object_data['author'] = $actor;
$object_data['context'] = defaults($object, 'context', null);
$object_data['conversation'] = defaults($object, 'conversation', null);
$object_data['sensitive'] = defaults($object, 'sensitive', null);
$object_data['name'] = defaults($object, 'title', null);
$object_data['name'] = defaults($object, 'name', $object_data['name']);
$object_data['summary'] = defaults($object, 'summary', null);
$object_data['content'] = defaults($object, 'content', null);
$object_data['source'] = defaults($object, 'source', null);
$object_data['location'] = JsonLD::fetchElement($object, 'location', 'name', 'type', 'Place');
$object_data['attachments'] = defaults($object, 'attachment', null);
$object_data['tags'] = defaults($object, 'tag', null);
$object_data['service'] = JsonLD::fetchElement($object, 'instrument', 'name', 'type', 'Service');
$object_data['alternate-url'] = JsonLD::fetchElement($object, 'url', 'href');
$object_data['receiver'] = self::getReceivers($object, $object_data['owner']);
// Common object data:
// Unhandled
// @context, type, actor, signature, mediaType, duration, replies, icon
// Also missing: (Defined in the standard, but currently unused)
// audience, preview, endTime, startTime, generator, image
// Data in Notes:
// Unhandled
// contentMap, announcement_count, announcements, context_id, likes, like_count
// inReplyToStatusId, shares, quoteUrl, statusnetConversationId
// Data in video:
// To-Do?
// category, licence, language, commentsEnabled
// Unhandled
// views, waitTranscoding, state, support, subtitleLanguage
// likes, dislikes, shares, comments
return $object_data;
}
/**
* @brief Converts mentions from Pleroma into the Friendica format
*
* @param string $body
*
* @return converted body
*/
private static function convertMentions($body)
{
$URLSearchString = "^\[\]";
$body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
return $body;
}
/**
* @brief Constructs a string with tags for a given tag array
*
* @param array $tags
* @param boolean $sensitive
*
* @return string with tags
*/
private static function constructTagList($tags, $sensitive)
{
if (empty($tags)) {
return '';
}
$tag_text = '';
foreach ($tags as $tag) {
if (in_array($tag['type'], ['Mention', 'Hashtag'])) {
if (!empty($tag_text)) {
$tag_text .= ',';
}
$tag_text .= substr($tag['name'], 0, 1) . '[url=' . $tag['href'] . ']' . substr($tag['name'], 1) . '[/url]';
}
}
/// @todo add nsfw for $sensitive
return $tag_text;
}
/**
* @brief
*
* @param $attachments
* @param array $item
*
* @return item array
*/
private static function constructAttachList($attachments, $item)
{
if (empty($attachments)) {
return $item;
}
foreach ($attachments as $attach) {
$filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
if ($filetype == 'image') {
$item['body'] .= "\n[img]".$attach['url'].'[/img]';
} else {
if (!empty($item["attach"])) {
$item["attach"] .= ',';
} else {
$item["attach"] = '';
}
if (!isset($attach['length'])) {
$attach['length'] = "0";
}
$item["attach"] .= '[attach]href="'.$attach['url'].'" length="'.$attach['length'].'" type="'.$attach['mediaType'].'" title="'.defaults($attach, 'name', '').'"[/attach]';
}
}
return $item;
}
/**
* @brief
*
* @param array $activity
* @param $body
*/
private static function createItem($activity, $body)
{
$item = [];
$item['verb'] = ACTIVITY_POST;
$item['parent-uri'] = $activity['reply-to-id'];
if ($activity['reply-to-id'] == $activity['id']) {
$item['gravity'] = GRAVITY_PARENT;
$item['object-type'] = ACTIVITY_OBJ_NOTE;
} else {
$item['gravity'] = GRAVITY_COMMENT;
$item['object-type'] = ACTIVITY_OBJ_COMMENT;
}
if (($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
logger('Parent ' . $activity['reply-to-id'] . ' not found. Try to refetch it.');
self::fetchMissingActivity($activity['reply-to-id'], $activity);
}
self::postItem($activity, $item, $body);
}
/**
* @brief
*
* @param array $activity
* @param $body
*/
private static function likeItem($activity, $body)
{
$item = [];
$item['verb'] = ACTIVITY_LIKE;
$item['parent-uri'] = $activity['object'];
$item['gravity'] = GRAVITY_ACTIVITY;
$item['object-type'] = ACTIVITY_OBJ_NOTE;
self::postItem($activity, $item, $body);
}
/**
* @brief
*
* @param array $activity
* @param $body
*/
private static function dislikeItem($activity, $body)
{
$item = [];
$item['verb'] = ACTIVITY_DISLIKE;
$item['parent-uri'] = $activity['object'];
$item['gravity'] = GRAVITY_ACTIVITY;
$item['object-type'] = ACTIVITY_OBJ_NOTE;
self::postItem($activity, $item, $body);
}
/**
* @brief
*
* @param array $activity
* @param array $item
* @param $body
*/
private static function postItem($activity, $item, $body)
{
/// @todo What to do with $activity['context']?
if (($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['parent-uri']])) {
logger('Parent ' . $item['parent-uri'] . ' not found, message will be discarded.', LOGGER_DEBUG);
return;
}
$item['network'] = Protocol::ACTIVITYPUB;
$item['private'] = !in_array(0, $activity['receiver']);
$item['author-id'] = Contact::getIdForURL($activity['author'], 0, true);
$item['owner-id'] = Contact::getIdForURL($activity['owner'], 0, true);
$item['uri'] = $activity['id'];
$item['created'] = $activity['published'];
$item['edited'] = $activity['updated'];
$item['guid'] = $activity['diaspora:guid'];
$item['title'] = HTML::toBBCode($activity['name']);
$item['content-warning'] = HTML::toBBCode($activity['summary']);
$item['body'] = self::convertMentions(HTML::toBBCode($activity['content']));
$item['location'] = $activity['location'];
$item['tag'] = self::constructTagList($activity['tags'], $activity['sensitive']);
$item['app'] = $activity['service'];
$item['plink'] = defaults($activity, 'alternate-url', $item['uri']);
$item = self::constructAttachList($activity['attachments'], $item);
$source = JsonLD::fetchElement($activity, 'source', 'content', 'mediaType', 'text/bbcode');
if (!empty($source)) {
$item['body'] = $source;
}
$item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
$item['source'] = $body;
$item['conversation-href'] = $activity['context'];
$item['conversation-uri'] = $activity['conversation'];
foreach ($activity['receiver'] as $receiver) {
$item['uid'] = $receiver;
$item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, true);
if (($receiver != 0) && empty($item['contact-id'])) {
$item['contact-id'] = Contact::getIdForURL($activity['author'], 0, true);
}
$item_id = Item::insert($item);
logger('Storing for user ' . $item['uid'] . ': ' . $item_id);
}
}
/**
* @brief
*
* @param $url
* @param $child
*/
private static function fetchMissingActivity($url, $child)
{
if (Config::get('system', 'ostatus_full_threads')) {
return;
}
$object = ActivityPub::fetchContent($url);
if (empty($object)) {
logger('Activity ' . $url . ' was not fetchable, aborting.');
return;
}
$activity = [];
$activity['@context'] = $object['@context'];
unset($object['@context']);
$activity['id'] = $object['id'];
$activity['to'] = defaults($object, 'to', []);
$activity['cc'] = defaults($object, 'cc', []);
$activity['actor'] = $child['author'];
$activity['object'] = $object;
$activity['published'] = $object['published'];
$activity['type'] = 'Create';
self::processActivity($activity);
logger('Activity ' . $url . ' had been fetched and processed.');
}
/**
* @brief perform a "follow" request
*
* @param array $activity
*/
private static function followUser($activity)
{
$actor = JsonLD::fetchElement($activity, 'object', 'id');
$uid = User::getIdForURL($actor);
if (empty($uid)) {
return;
}
$owner = User::getOwnerDataById($uid);
$cid = Contact::getIdForURL($activity['owner'], $uid);
if (!empty($cid)) {
$contact = DBA::selectFirst('contact', [], ['id' => $cid]);
} else {
$contact = false;
}
$item = ['author-id' => Contact::getIdForURL($activity['owner']),
'author-link' => $activity['owner']];
Contact::addRelationship($owner, $contact, $item);
$cid = Contact::getIdForURL($activity['owner'], $uid);
if (empty($cid)) {
return;
}
$contact = DBA::selectFirst('contact', ['network'], ['id' => $cid]);
if ($contact['network'] != Protocol::ACTIVITYPUB) {
Contact::updateFromProbe($cid, Protocol::ACTIVITYPUB);
}
DBA::update('contact', ['hub-verify' => $activity['id']], ['id' => $cid]);
logger('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
}
/**
* @brief Update the given profile
*
* @param array $activity
*/
private static function updatePerson($activity)
{
if (empty($activity['object']['id'])) {
return;
}
logger('Updating profile for ' . $activity['object']['id'], LOGGER_DEBUG);
APContact::getProfileByURL($activity['object']['id'], true);
}
/**
* @brief Accept a follow request
*
* @param array $activity
*/
private static function acceptFollowUser($activity)
{
$actor = JsonLD::fetchElement($activity, 'object', 'actor');
$uid = User::getIdForURL($actor);
if (empty($uid)) {
return;
}
$owner = User::getOwnerDataById($uid);
$cid = Contact::getIdForURL($activity['owner'], $uid);
if (empty($cid)) {
logger('No contact found for ' . $activity['owner'], LOGGER_DEBUG);
return;
}
$fields = ['pending' => false];
$contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
if ($contact['rel'] == Contact::FOLLOWER) {
$fields['rel'] = Contact::FRIEND;
}
$condition = ['id' => $cid];
DBA::update('contact', $fields, $condition);
logger('Accept contact request from contact ' . $cid . ' for user ' . $uid, LOGGER_DEBUG);
}
/**
* @brief Undo activity like "like" or "dislike"
*
* @param array $activity
*/
private static function undoActivity($activity)
{
$activity_url = JsonLD::fetchElement($activity, 'object', 'id');
if (empty($activity_url)) {
return;
}
$actor = JsonLD::fetchElement($activity, 'object', 'actor');
if (empty($actor)) {
return;
}
$author_id = Contact::getIdForURL($actor);
if (empty($author_id)) {
return;
}
Item::delete(['uri' => $activity_url, 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
}
/**
* @brief Activity to remove a follower
*
* @param array $activity
*/
private static function undoFollowUser($activity)
{
$object = JsonLD::fetchElement($activity, 'object', 'object');
$uid = User::getIdForURL($object);
if (empty($uid)) {
return;
}
$owner = User::getOwnerDataById($uid);
$cid = Contact::getIdForURL($activity['owner'], $uid);
if (empty($cid)) {
logger('No contact found for ' . $activity['owner'], LOGGER_DEBUG);
return;
}
$contact = DBA::selectFirst('contact', [], ['id' => $cid]);
if (!DBA::isResult($contact)) {
return;
}
Contact::removeFollower($owner, $contact);
logger('Undo following request from contact ' . $cid . ' for user ' . $uid, LOGGER_DEBUG);
}
}