<?php
/**
* GNU social - a federating social network
*
* ActivityPubPlugin implementation for GNU Social
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Plugin
* @package GNUsocial
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @author Daniel Supernault <danielsupernault@gmail.com>
* @copyright 2018 Free Software Foundation http://fsf.org
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link https://www.gnu.org/software/social/
*/
if (!defined('GNUSOCIAL')) {
exit(1);
}
// Ensure proper timezone
date_default_timezone_set('UTC');
// Import required files by the plugin
require __DIR__.'/vendor/autoload.php';
require_once __DIR__ . DIRECTORY_SEPARATOR . "utils" . DIRECTORY_SEPARATOR . "discoveryhints.php";
require_once __DIR__ . DIRECTORY_SEPARATOR . "utils" . DIRECTORY_SEPARATOR . "explorer.php";
require_once __DIR__ . DIRECTORY_SEPARATOR . "utils" . DIRECTORY_SEPARATOR . "postman.php";
// So that this isn't hardcoded everywhere
define('ACTIVITYPUB_BASE_INSTANCE_URI', common_root_url()."index.php/user/");
/**
* @category Plugin
* @package GNUsocial
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://www.gnu.org/software/social/
*/
class ActivityPubPlugin extends Plugin
{
/**
* Returns a Actor's URI from its local $profile
* Works both for local and remote users.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Profile $profile Actor's local profile
* @return string Actor's URI
*/
public static function actor_uri($profile)
{
if ($profile->isLocal()) {
return ACTIVITYPUB_BASE_INSTANCE_URI.$profile->getID();
} else {
return $profile->getUri();
}
}
/**
* Returns a Actor's URL from its local $profile
* Works both for local and remote users.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Profile $profile Actor's local profile
* @return string Actor's URL
*/
public static function actor_url($profile)
{
return ActivityPubPlugin::actor_uri($profile)."/";
}
/**
* Returns a notice from its URL since GNU Social doesn't provide
* this functionality
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param string $url Notice's URL
* @return Notice The Notice object
* @throws Exception This function or provides a Notice or fails with exception
*/
public static function get_local_notice_from_url($url)
{
try {
return Notice::getByUri($data->object->inReplyTo);
} catch (Exception $e) {
try {
$candidate = Notice::getByID(intval(substr($url, strlen(common_local_url('shownotice', ['notice' => ''])))));
if ($candidate->getUrl() == $url) { // Sanity check
return $candidate;
} else {
throw new Exception("Notice not found.");
}
} catch (Exception $e) {
throw new Exception("Notice not found.");
}
}
}
/**
* Route/Reroute urls
*
* @param URLMapper $m
* @return void
*/
public function onRouterInitialized(URLMapper $m)
{
ActivityPubURLMapperOverwrite::variable(
$m,
'user/:id',
['id' => '[0-9]+'],
'apActorProfile'
);
// Special route for webfinger purposes
ActivityPubURLMapperOverwrite::variable(
$m,
':nickname',
['nickname' => Nickname::DISPLAY_FMT],
'apActorProfile'
);
ActivityPubURLMapperOverwrite::variable(
$m,
'notice/:id',
['id' => '[0-9]+'],
'apNotice'
);
$m->connect(
'user/:id/liked.json',
['action' => 'apActorLiked'],
['id' => '[0-9]+']
);
$m->connect(
'user/:id/followers.json',
['action' => 'apActorFollowers'],
['id' => '[0-9]+']
);
$m->connect(
'user/:id/following.json',
['action' => 'apActorFollowing'],
['id' => '[0-9]+']
);
$m->connect(
'user/:id/inbox.json',
['action' => 'apActorInbox'],
['id' => '[0-9]+']
);
$m->connect(
'inbox.json',
['action' => 'apSharedInbox']
);
}
/**
* Plugin version information
*
* @param array $versions
* @return boolean hook true
*/
public function onPluginVersion(array &$versions)
{
$versions[] = [ 'name' => 'ActivityPub',
'version' => GNUSOCIAL_VERSION,
'author' => 'Diogo Cordeiro, Daniel Supernault',
'homepage' => 'https://www.gnu.org/software/social/',
'rawdescription' => 'Adds ActivityPub Support'];
return true;
}
/**
* Dummy string on AccountProfileBlock stating that ActivityPub is active
* this is more of a placeholder for eventual useful stuff ._.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @return boolean hook return value
*/
public function onEndShowAccountProfileBlock(HTMLOutputter $out, Profile $profile)
{
if ($profile->isLocal()) {
return true;
}
try {
$aprofile = Activitypub_profile::getKV('profile_id', $profile->id);
} catch (NoResultException $e) {
// Not a remote ActivityPub_profile! Maybe some other network
// that has imported a non-local user (e.g.: OStatus)?
return true;
}
$out->elementStart('dl', 'entity_tags activitypub_profile');
$out->element('dt', null, _m('ActivityPub'));
$out->element('dd', null, _m('Active'));
$out->elementEnd('dl');
}
/**
* Make sure necessary tables are filled out.
*
* @return boolean hook true
*/
public function onCheckSchema()
{
$schema = Schema::get();
$schema->ensureTable('Activitypub_profile', Activitypub_profile::schemaDef());
$schema->ensureTable('Activitypub_rsa', Activitypub_rsa::schemaDef());
$schema->ensureTable('Activitypub_pending_follow_requests', Activitypub_pending_follow_requests::schemaDef());
return true;
}
/********************************************************
* WebFinger Events *
********************************************************/
/**
* Get remote user's ActivityPub_profile via a identifier
*
* @author GNU Social
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param string $arg A remote user identifier
* @return Activitypub_profile|null Valid profile in success | null otherwise
*/
public static function pull_remote_profile($arg)
{
if (preg_match('!^((?:\w+\.)*\w+@(?:\w+\.)*\w+(?:\w+\-\w+)*\.\w+)$!', $arg)) {
// webfinger lookup
try {
return Activitypub_profile::ensure_web_finger($arg);
} catch (Exception $e) {
common_log(LOG_ERR, 'Webfinger lookup failed for ' .
$arg . ': ' . $e->getMessage());
}
}
// Look for profile URLs, with or without scheme:
$urls = array();
if (preg_match('!^https?://((?:\w+\.)*\w+(?:\w+\-\w+)*\.\w+(?:/\w+)+)$!', $arg)) {
$urls[] = $arg;
}
if (preg_match('!^((?:\w+\.)*\w+(?:\w+\-\w+)*\.\w+(?:/\w+)+)$!', $arg)) {
$schemes = array('http', 'https');
foreach ($schemes as $scheme) {
$urls[] = "$scheme://$arg";
}
}
foreach ($urls as $url) {
try {
return Activitypub_profile::fromUri($url);
} catch (Exception $e) {
common_log(LOG_ERR, 'Profile lookup failed for ' .
$arg . ': ' . $e->getMessage());
}
}
return null;
}
/**
* Webfinger matches: @user@example.com or even @user--one.george_orwell@1984.biz
*
* @author GNU Social
* @param string $text The text from which to extract webfinger IDs
* @param string $preMention Character(s) that signals a mention ('@', '!'...)
* @return array The matching IDs (without $preMention) and each respective position in the given string.
*/
public static function extractWebfingerIds($text, $preMention='@')
{
$wmatches = [];
$result = preg_match_all(
'/(?<!\S)'.preg_quote($preMention, '/').'('.Nickname::WEBFINGER_FMT.')/',
$text,
$wmatches,
PREG_OFFSET_CAPTURE
);
if ($result === false) {
common_log(LOG_ERR, __METHOD__ . ': Error parsing webfinger IDs from text (preg_last_error=='.preg_last_error().').');
return [];
} elseif ($n_matches = count($wmatches)) {
common_debug(sprintf('Found %d matches for WebFinger IDs: %s', $n_matches, _ve($wmatches)));
}
return $wmatches[1];
}
/**
* Profile URL matches: @example.com/mublog/user
*
* @author GNU Social
* @param string $text The text from which to extract URL mentions
* @param string $preMention Character(s) that signals a mention ('@', '!'...)
* @return array The matching URLs (without @ or acct:) and each respective position in the given string.
*/
public static function extractUrlMentions($text, $preMention='@')
{
$wmatches = array();
// In the regexp below we need to match / _before_ URL_REGEX_VALID_PATH_CHARS because it otherwise gets merged
// with the TLD before (but / is in URL_REGEX_VALID_PATH_CHARS anyway, it's just its positioning that is important)
$result = preg_match_all(
'/(?:^|\s+)'.preg_quote($preMention, '/').'('.URL_REGEX_DOMAIN_NAME.'(?:\/['.URL_REGEX_VALID_PATH_CHARS.']*)*)/',
$text,
$wmatches,
PREG_OFFSET_CAPTURE
);
if ($result === false) {
common_log(LOG_ERR, __METHOD__ . ': Error parsing profile URL mentions from text (preg_last_error=='.preg_last_error().').');
} elseif (count($wmatches)) {
common_debug(sprintf('Found %d matches for profile URL mentions: %s', count($wmatches), _ve($wmatches)));
}
return $wmatches[1];
}
/**
* Add activity+json mimetype on WebFinger
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param XML_XRD $xrd
* @param Managed_DataObject $object
*/
public function onEndWebFingerProfileLinks(XML_XRD &$xrd, Managed_DataObject $object)
{
if ($object->isPerson()) {
$link = new XML_XRD_Element_Link(
'self',
ActivityPubPlugin::actor_uri($object->getProfile()),
'application/activity+json'
);
$xrd->links[] = clone ($link);
}
}
/**
* Find any explicit remote mentions. Accepted forms:
* Webfinger: @user@example.com
* Profile link: @example.com/mublog/user
*
* @author GNU Social
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Profile $sender
* @param string $text input markup text
* @param array &$mention in/out param: set of found mentions
* @return boolean hook return value
*/
public function onEndFindMentions(Profile $sender, $text, &$mentions)
{
$matches = array();
foreach (self::extractWebfingerIds($text, '@') as $wmatch) {
list($target, $pos) = $wmatch;
$this->log(LOG_INFO, "Checking webfinger person '$target'");
$profile = null;
try {
$aprofile = Activitypub_profile::ensure_web_finger($target);
$profile = $aprofile->local_profile();
} catch (Exception $e) {
$this->log(LOG_ERR, "Webfinger check failed: " . $e->getMessage());
continue;
}
assert($profile instanceof Profile);
$displayName = !empty($profile->nickname) && mb_strlen($profile->nickname) < mb_strlen($target)
? $profile->getNickname() // TODO: we could do getBestName() or getFullname() here
: $target;
$url = $profile->getUri();
if (!common_valid_http_url($url)) {
$url = $profile->getUrl();
}
$matches[$pos] = array('mentioned' => array($profile),
'type' => 'mention',
'text' => $displayName,
'position' => $pos,
'length' => mb_strlen($target),
'url' => $url);
}
foreach (self::extractUrlMentions($text) as $wmatch) {
list($target, $pos) = $wmatch;
$schemes = array('https', 'http');
foreach ($schemes as $scheme) {
$url = "$scheme://$target";
$this->log(LOG_INFO, "Checking profile address '$url'");
try {
$aprofile = Activitypub_profile::fromUri($url);
$profile = $aprofile->local_profile();
$displayName = !empty($profile->nickname) && mb_strlen($profile->nickname) < mb_strlen($target) ?
$profile->nickname : $target;
$matches[$pos] = array('mentioned' => array($profile),
'type' => 'mention',
'text' => $displayName,
'position' => $pos,
'length' => mb_strlen($target),
'url' => $profile->getUrl());
break;
} catch (Exception $e) {
$this->log(LOG_ERR, "Profile check failed: " . $e->getMessage());
}
}
}
foreach ($mentions as $i => $other) {
// If we share a common prefix with a local user, override it!
$pos = $other['position'];
if (isset($matches[$pos])) {
$mentions[$i] = $matches[$pos];
unset($matches[$pos]);
}
}
foreach ($matches as $mention) {
$mentions[] = $mention;
}
return true;
}
/**
* Allow remote profile references to be used in commands:
* sub update@status.net
* whois evan@identi.ca
* reply http://identi.ca/evan hey what's up
*
* @author GNU Social
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Command $command
* @param string $arg
* @param Profile &$profile
* @return hook return code
*/
public function onStartCommandGetProfile($command, $arg, &$profile)
{
try {
$aprofile = $this->pull_remote_profile($arg);
$profile = $aprofile->local_profile();
} catch (Exception $e) {
// No remote ActivityPub profile found
return true;
}
return false;
}
/********************************************************
* Discovery Events *
********************************************************/
/**
* Profile URI for remote profiles.
*
* @author GNU Social
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Profile $profile
* @param string $uri in/out
* @return mixed hook return code
*/
public function onStartGetProfileUri($profile, &$uri)
{
$aprofile = Activitypub_profile::getKV('profile_id', $profile->id);
if ($aprofile instanceof Activitypub_profile) {
$uri = $aprofile->getUri();
return false;
}
return true;
}
/**
* Profile from URI.
*
* @author GNU Social
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param string $uri
* @param Profile &$profile in/out param: Profile got from URI
* @return mixed hook return code
*/
public function onStartGetProfileFromURI($uri, &$profile)
{
try {
$explorer = new Activitypub_explorer();
$profile = $explorer->lookup($uri)[0];
return false;
} catch (Exception $e) {
return true; // It's not an ActivityPub profile as far as we know, continue event handling
}
}
/********************************************************
* Delivery Events *
********************************************************/
/**
* Having established a remote subscription, send a notification to the
* remote ActivityPub profile's endpoint.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Profile $profile subscriber
* @param Profile $other subscribee
* @return hook return value
* @throws Exception
*/
public function onStartSubscribe(Profile $profile, Profile $other)
{
if (!$profile->isLocal() && $other->isLocal()) {
return true;
}
try {
$other = Activitypub_profile::from_profile($other);
} catch (Exception $e) {
return true;
}
$postman = new Activitypub_postman($profile, array($other));
$postman->follow();
return true;
}
/**
* Notify remote server on unsubscribe.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Profile $profile
* @param Profile $other
* @return hook return value
*/
public function onStartUnsubscribe(Profile $profile, Profile $other)
{
if (!$profile->isLocal() && $other->isLocal()) {
return true;
}
try {
$other = Activitypub_profile::from_profile($other);
} catch (Exception $e) {
return true;
}
$postman = new Activitypub_postman($profile, array($other));
$postman->undo_follow();
return true;
}
/**
* Notify remote users when their notices get favorited.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Profile $profile of local user doing the faving
* @param Notice $notice Notice being favored
* @return hook return value
*/
public function onEndFavorNotice(Profile $profile, Notice $notice)
{
// Only distribute local users' favor actions, remote users
// will have already distributed theirs.
if (!$profile->isLocal()) {
return true;
}
$other = array();
try {
$other[] = Activitypub_profile::from_profile($notice->getProfile());
} catch (Exception $e) {
// Local user can be ignored
}
foreach ($notice->getAttentionProfiles() as $to_profile) {
try {
$other[] = Activitypub_profile::from_profile($to_profile);
} catch (Exception $e) {
// Local user can be ignored
}
}
if ($notice->reply_to) {
try {
$other[] = Activitypub_profile::from_profile($notice->getParent()->getProfile());
} catch (Exception $e) {
// Local user can be ignored
}
try {
$mentions = $notice->getParent()->getAttentionProfiles();
foreach ($mentions as $to_profile) {
try {
$other[] = Activitypub_profile::from_profile($to_profile);
} catch (Exception $e) {
// Local user can be ignored
}
}
} catch (NoParentNoticeException $e) {
// This is not a reply to something (has no parent)
} catch (NoResultException $e) {
// Parent author's profile not found! Complain louder?
common_log(LOG_ERR, "Parent notice's author not found: ".$e->getMessage());
}
}
$postman = new Activitypub_postman($profile, $other);
$postman->like($notice);
return true;
}
/**
* Notify remote users when their notices get de-favorited.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Profile $profile of local user doing the de-faving
* @param Notice $notice Notice being favored
* @return hook return value
*/
public function onEndDisfavorNotice(Profile $profile, Notice $notice)
{
// Only distribute local users' favor actions, remote users
// will have already distributed theirs.
if (!$profile->isLocal()) {
return true;
}
$other = array();
try {
$other[] = Activitypub_profile::from_profile($notice->getProfile());
} catch (Exception $e) {
// Local user can be ignored
}
foreach ($notice->getAttentionProfiles() as $to_profile) {
try {
$other[] = Activitypub_profile::from_profile($to_profile);
} catch (Exception $e) {
// Local user can be ignored
}
}
if ($notice->reply_to) {
try {
$other[] = Activitypub_profile::from_profile($notice->getParent()->getProfile());
} catch (Exception $e) {
// Local user can be ignored
}
try {
$mentions = $notice->getParent()->getAttentionProfiles();
foreach ($mentions as $to_profile) {
try {
$other[] = Activitypub_profile::from_profile($to_profile);
} catch (Exception $e) {
// Local user can be ignored
}
}
} catch (NoParentNoticeException $e) {
// This is not a reply to something (has no parent)
} catch (NoResultException $e) {
// Parent author's profile not found! Complain louder?
common_log(LOG_ERR, "Parent notice's author not found: ".$e->getMessage());
}
}
$postman = new Activitypub_postman($profile, $other);
$postman->undo_like($notice);
return true;
}
/**
* Notify remote users when their notices get deleted
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @return boolean hook flag
*/
public function onStartDeleteOwnNotice($user, $notice)
{
$profile = $user->getProfile();
// Only distribute local users' delete actions, remote users
// will have already distributed theirs.
if (!$profile->isLocal()) {
return true;
}
$other = array();
foreach ($notice->getAttentionProfiles() as $to_profile) {
try {
$other[] = Activitypub_profile::from_profile($to_profile);
} catch (Exception $e) {
// Local user can be ignored
}
}
if ($notice->reply_to) {
try {
$other[] = Activitypub_profile::from_profile($notice->getParent()->getProfile());
} catch (Exception $e) {
// Local user can be ignored
}
try {
$mentions = $notice->getParent()->getAttentionProfiles();
foreach ($mentions as $to_profile) {
try {
$other[] = Activitypub_profile::from_profile($to_profile);
} catch (Exception $e) {
// Local user can be ignored
}
}
} catch (NoParentNoticeException $e) {
// This is not a reply to something (has no parent)
} catch (NoResultException $e) {
// Parent author's profile not found! Complain louder?
common_log(LOG_ERR, "Parent notice's author not found: ".$e->getMessage());
}
}
$postman = new Activitypub_postman($profile, $other);
$postman->delete($notice);
return true;
}
/**
* Insert notifications for replies, mentions and repeats
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @return boolean hook flag
*/
public function onStartNoticeDistribute($notice)
{
assert($notice->id > 0); // Ignore if not a valid notice
$profile = Profile::getKV($notice->profile_id);
if (!$profile->isLocal()) {
return true;
}
$other = array();
try {
$other[] = Activitypub_profile::from_profile($notice->getProfile());
} catch (Exception $e) {
// Local user can be ignored
}
foreach ($notice->getAttentionProfiles() as $to_profile) {
try {
$other[] = Activitypub_profile::from_profile($to_profile);
} catch (Exception $e) {
// Local user can be ignored
}
}
// Is Announce
if ($notice->isRepeat()) {
$repeated_notice = Notice::getKV('id', $notice->repeat_of);
if ($repeated_notice instanceof Notice) {
try {
$other[] = Activitypub_profile::from_profile($repeated_notice->getProfile());
} catch (Exception $e) {
// Local user can be ignored
}
$postman = new Activitypub_postman($profile, $other);
// That was it
$postman->announce($repeated_notice);
return true;
}
}
// Ignore for activity/non-post-verb notices
if (method_exists('ActivityUtils', 'compareVerbs')) {
$is_post_verb = ActivityUtils::compareVerbs(
$notice->verb,
[ActivityVerb::POST]
);
} else {
$is_post_verb = ($notice->verb == ActivityVerb::POST ? true : false);
}
if ($notice->source == 'activity' || !$is_post_verb) {
return true;
}
// Create
if ($notice->reply_to) {
try {
$other[] = Activitypub_profile::from_profile($notice->getParent()->getProfile());
} catch (Exception $e) {
// Local user can be ignored
}
try {
$mentions = $notice->getParent()->getAttentionProfiles();
foreach ($mentions as $to_profile) {
try {
$other[] = Activitypub_profile::from_profile($to_profile);
} catch (Exception $e) {
// Local user can be ignored
}
}
} catch (NoParentNoticeException $e) {
// This is not a reply to something (has no parent)
} catch (NoResultException $e) {
// Parent author's profile not found! Complain louder?
common_log(LOG_ERR, "Parent notice's author not found: ".$e->getMessage());
}
}
$postman = new Activitypub_postman($profile, $other);
// That was it
$postman->create($notice);
return true;
}
/**
* Override the "from ActivityPub" bit in notice lists to link to the
* original post and show the domain it came from.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param Notice in $notice
* @param string out &$name
* @param string out &$url
* @param string out &$title
* @return mixed hook return code
*/
public function onStartNoticeSourceLink($notice, &$name, &$url, &$title)
{
// If we don't handle this, keep the event handler going
if (!in_array($notice->source, array('ActivityPub', 'share'))) {
return true;
}
try {
$url = $notice->getUrl();
// If getUrl() throws exception, $url is never set
$bits = parse_url($url);
$domain = $bits['host'];
if (substr($domain, 0, 4) == 'www.') {
$name = substr($domain, 4);
} else {
$name = $domain;
}
// TRANS: Title. %s is a domain name.
$title = sprintf(_m('Sent from %s via ActivityPub'), $domain);
// Abort event handler, we have a name and URL!
return false;
} catch (InvalidUrlException $e) {
// This just means we don't have the notice source data
return true;
}
}
}
/**
* Plugin return handler
*/
class ActivityPubReturn
{
/**
* Return a valid answer
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param array $res
* @return void
*/
public static function answer($res, $code = 200)
{
http_response_code($code);
header('Content-Type: application/activity+json');
echo json_encode($res, JSON_UNESCAPED_SLASHES | (isset($_GET["pretty"]) ? JSON_PRETTY_PRINT : null));
exit;
}
/**
* Return an error
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param string $m
* @param int32 $code
* @return void
*/
public static function error($m, $code = 500)
{
http_response_code($code);
header('Content-Type: application/activity+json');
$res[] = Activitypub_error::error_message_to_array($m);
echo json_encode($res, JSON_UNESCAPED_SLASHES);
exit;
}
/**
* Select content type from HTTP Accept header
*
* @author Maciej Łebkowski <m.lebkowski@gmail.com>
* @param array $mimeTypes Supported Types
* @return array|null of supported mime types sorted | null if none valid
*/
public static function getBestSupportedMimeType($mimeTypes = null)
{
// Values will be stored in this array
$AcceptTypes = array();
// Accept header is case insensitive, and whitespace isn’t important
$accept = strtolower(str_replace(' ', '', $_SERVER['HTTP_ACCEPT']));
// divide it into parts in the place of a ","
$accept = explode(',', $accept);
foreach ($accept as $a) {
// the default quality is 1.
$q = 1;
// check if there is a different quality
if (strpos($a, ';q=')) {
// divide "mime/type;q=X" into two parts: "mime/type" i "X"
list($a, $q) = explode(';q=', $a);
}
// mime-type $a is accepted with the quality $q
// WARNING: $q == 0 means, that mime-type isn’t supported!
$AcceptTypes[$a] = $q;
}
arsort($AcceptTypes);
// if no parameter was passed, just return parsed data
if (!$mimeTypes) {
return $AcceptTypes;
}
$mimeTypes = array_map('strtolower', (array)$mimeTypes);
// let’s check our supported types:
foreach ($AcceptTypes as $mime => $q) {
if ($q && in_array($mime, $mimeTypes)) {
return $mime;
}
}
// no mime-type found
return null;
}
}
/**
* Overwrites variables in URL-mapping
*/
class ActivityPubURLMapperOverwrite extends URLMapper
{
public static function variable($m, $path, $paramPatterns, $newaction)
{
$mimes = [
'application/json',
'application/activity+json',
'application/ld+json',
'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'
];
if (is_null(ActivityPubReturn::getBestSupportedMimeType($mimes))) {
return true;
}
$m->connect($path, array('action' => $newaction), $paramPatterns);
$regex = self::makeRegex($path, $paramPatterns);
foreach ($m->variables as $n => $v) {
if ($v[1] == $regex) {
$m->variables[$n][0]['action'] = $newaction;
}
}
}
}