GNUsocial/gnu-social
4
0
Fork 1
Code Issues Releases Wiki Activity

[ActivityPub] Initial cleanup, removing 'die' statements, and ignoring the subfolders

Browse Source
This commit is contained in:
Hugo Sales 2020-08-21 20:36:56 +00:00 committed by Hugo Sales
parent 38cfec8593
commit b624359b9a
Signed by: someonewithpc
GPG Key ID: 7D0C7EAFC9D835A0
2 changed files with 196 additions and 140 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
config/services.yaml
View File

@ -47,9 +47,10 @@ services:
Symfony\Bridge\Doctrine\Security\RememberMe\DoctrineTokenProvider: ~
Plugin\:
resource: '../plugins/*'
resource: '../plugins/*/*.php'
exclude: '../plugins/*/{scripts,classes,lib,actions,locale,doc}'
tags: ['controller.service_arguments']
Component\:
resource: '../components/*'
resource: '../components/*/*.php'
tags: ['controller.service_arguments']

225
plugins/ActivityPub/ActivityPubPlugin.php → plugins/ActivityPub/ActivityPub.php
View File

@ -1,4 +1,7 @@
<?php
// {{{ License
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
@ -14,48 +17,56 @@
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
// }}}
/**
* ActivityPub implementation for GNU social
*
* @package GNUsocial
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @copyright 2018-2019 Free Software Foundation, Inc http://www.fsf.org
* @author Hugo Sales <hugo@fc.up.pt>
* @copyright 2018-2020 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
* @link http://www.gnu.org/software/social/
*
* @see http://www.gnu.org/software/social/
*/
defined('GNUSOCIAL') || die();
namespace Plugin\ActivityPub;
// Import plugin libs
foreach (glob(__DIR__ . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . '*.php') as $filename) {
require_once $filename;
}
// Import plugin models
foreach (glob(__DIR__ . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . 'models' . DIRECTORY_SEPARATOR . '*.php') as $filename) {
require_once $filename;
}
use App\Core\Module;
// So that this isn't hardcoded everywhere
const ACTIVITYPUB_PUBLIC_TO = ['https://www.w3.org/ns/activitystreams#Public',
'Public',
'as:Public'
];
const ACTIVITYPUB_HTTP_CLIENT_HEADERS = [
'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
'User-Agent: GNUsocialBot ' . GNUSOCIAL_VERSION . ' - https://gnusocial.rocks'
];
// // Import plugin libs
// foreach (glob(__DIR__ . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . '*.php') as $filename) {
// require_once $filename;
// }
// // Import plugin models
// foreach (glob(__DIR__ . DIRECTORY_SEPARATOR . 'lib' . DIRECTORY_SEPARATOR . 'models' . DIRECTORY_SEPARATOR . '*.php') as $filename) {
// require_once $filename;
// }
/**
* Adds ActivityPub support to GNU social when enabled
*
* @category Plugin
* @package GNUsocial
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class ActivityPubPlugin extends Plugin
class ActivityPub extends Module
{
const PLUGIN_VERSION = '0.4.0alpha0';
// So that this isn't hardcoded everywhere
const ACTIVITYPUB_PUBLIC_TO = ['https://www.w3.org/ns/activitystreams#Public',
'Public',
'as:Public',
];
const ACTIVITYPUB_HTTP_CLIENT_HEADERS = [
'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
'User-Agent: GNUsocialBot ' . GNUSOCIAL_VERSION . ' - https://gnusocial.network',
];
/**
* Returns a Actor's URI from its local $profile
@ -65,7 +76,9 @@ class ActivityPubPlugin extends Plugin
*
* @param Profile $profile Actor's local profile
* @param string &$uri I/O Actor's URI
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*
* @return bool event hook
*/
public function onStartGetProfileUri(Profile $profile, &$uri): bool
@ -83,13 +96,16 @@ class ActivityPubPlugin extends Plugin
*
* @param string $url Notice's URL
* @param bool $grab_online whether to try online grabbing, defaults to true
* @return Notice|null The Notice object
*
* @throws Exception This function or provides a Notice, null, or fails with exception
*
* @return null|Notice The Notice object
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function grab_notice_from_url(string $url, bool $grab_online = true): ?Notice
{
/* Offline Grabbing */
// Offline Grabbing
try {
// Look for a known remote notice
return Notice::getByUri($url);
@ -97,19 +113,19 @@ class ActivityPubPlugin extends Plugin
// Look for a local notice (unfortunately GNU social doesn't
// provide this functionality natively)
try {
$candidate = Notice::getByID((int)substr($url, (strlen(Activitypub_notice::note_uri(0))-1)));
if (Activitypub_notice::note_uri($candidate->getID()) === $url) { // Sanity check
$candidate = Notice::getByID((int) substr($url, (strlen(common_local_url('apNotice', ['id' => 0])) - 1)));
if (common_local_url('apNotice', ['id' => $candidate->getID()]) === $url) { // Sanity check
return $candidate;
} else {
common_debug('ActivityPubPlugin Notice Grabber: '.$candidate->getUrl(). ' is different of '.$url);
common_debug('ActivityPubPlugin Notice Grabber: ' . $candidate->getUrl() . ' is different of ' . $url);
}
} catch (Exception $e) {
common_debug('ActivityPubPlugin Notice Grabber: failed to find: '.$url.' offline.');
common_debug('ActivityPubPlugin Notice Grabber: failed to find: ' . $url . ' offline.');
}
}
if ($grab_online) {
/* Online Grabbing */
// Online Grabbing
$client = new HTTPClient();
$response = $client->get($url, ACTIVITYPUB_HTTP_CLIENT_HEADERS);
$object = json_decode($response->getBody(), true);
@ -132,11 +148,11 @@ class ActivityPubPlugin extends Plugin
throw new Exception("The acclaimed actor didn't create this note.");
}
} else {
throw new Exception("Invalid Note Object. Maybe it's a Tombstone?");
throw new Exception('Valid ActivityPub Notice object but unsupported by GNU social.');
}
}
common_debug('ActivityPubPlugin Notice Grabber: failed to find: '.$url);
common_debug('ActivityPubPlugin Notice Grabber: failed to find: ' . $url);
return null;
}
@ -144,8 +160,10 @@ class ActivityPubPlugin extends Plugin
* Route/Reroute urls
*
* @param URLMapper $m
* @return void
*
* @throws Exception
*
* @return void
*/
public function onRouterInitialized(URLMapper $m)
{
@ -153,7 +171,7 @@ class ActivityPubPlugin extends Plugin
'application/ld+json; profile="https://www.w3.org/ns/activitystreams"' => 0,
'application/activity+json' => 1,
'application/json' => 2,
'application/ld+json' => 3
'application/ld+json' => 3,
];
$m->connect(
@ -242,6 +260,7 @@ class ActivityPubPlugin extends Plugin
* Plugin version information
*
* @param array $versions
*
* @return bool hook true
*/
public function onPluginVersion(array &$versions): bool
@ -252,8 +271,8 @@ class ActivityPubPlugin extends Plugin
'author' => 'Diogo Cordeiro',
'homepage' => 'https://notabug.org/diogo/gnu-social/src/nightly/plugins/ActivityPub',
// TRANS: Plugin description.
'rawdescription' => _m('Follow people across social networks that implement '.
'<a href="https://activitypub.rocks/">ActivityPub</a>.')
'rawdescription' => _m('Follow people across social networks that implement ' .
'<a href="https://activitypub.rocks/">ActivityPub</a>.'),
];
return true;
}
@ -262,6 +281,7 @@ class ActivityPubPlugin extends Plugin
* Set up queue handlers for required interactions
*
* @param QueueManager $qm
*
* @return bool event hook return
*/
public function onEndInitializeQueueManager(QueueManager $qm): bool
@ -277,7 +297,8 @@ class ActivityPubPlugin extends Plugin
* Enqueue saved notices for distribution
*
* @param Notice $notice notice to be distributed
* @param Array &$transports list of transports to queue for
* @param array &$transports list of transports to queue for
*
* @return bool event hook return
*/
public function onStartEnqueueNotice(Notice $notice, array &$transports): bool
@ -290,7 +311,7 @@ class ActivityPubPlugin extends Plugin
$this->log(LOG_INFO, "Notice:{$id} queued for distribution");
}
} catch (Exception $e) {
$this->log(LOG_ERR, "Invalid notice, not queueing for distribution");
$this->log(LOG_ERR, 'Invalid notice, not queueing for distribution');
}
return true;
@ -302,6 +323,7 @@ class ActivityPubPlugin extends Plugin
* notices away from the public timelines.
*
* @param Notice &$notice notice to be saved
*
* @return bool event hook return
*/
public function onStartNoticeSave(Notice &$notice): bool
@ -309,14 +331,13 @@ class ActivityPubPlugin extends Plugin
if ($notice->reply_to) {
try {
$parent = $notice->getParent();
$is_local = (int)$parent->is_local;
$is_local = (int) $parent->is_local;
// if we're replying unlisted/followers-only notices received by AP
// or replying to replies of such notices, then we make sure to set
// the correct type flag.
if (($parent->source === 'ActivityPub' && $is_local === Notice::GATEWAY) ||
($parent->source === 'web' && $is_local === Notice::LOCAL_NONPUBLIC)) {
$this->log(LOG_INFO, "Enforcing type flag LOCAL_NONPUBLIC for new notice");
if (($parent->source === 'ActivityPub' && $is_local === Notice::GATEWAY) || ($parent->source === 'web' && $is_local === Notice::LOCAL_NONPUBLIC)) {
$this->log(LOG_INFO, 'Enforcing type flag LOCAL_NONPUBLIC for new notice');
$notice->is_local = Notice::LOCAL_NONPUBLIC;
}
} catch (NoParentNoticeException $e) {
@ -332,6 +353,7 @@ class ActivityPubPlugin extends Plugin
*
* @param User $current current logged user
* @param array &$recipients
*
* @return void
*/
public function onFillDirectMessageRecipients(User $current, array &$recipients): void
@ -341,10 +363,10 @@ class ActivityPubPlugin extends Plugin
foreach ($subs as $sub) {
if (!$sub->isLocal()) { // AP plugin adds AP users
try {
$value = 'profile:'.$sub->getID();
$value = 'profile:' . $sub->getID();
$recipients[$value] = substr($sub->getAcctUri(), 5) . " [{$sub->getBestName()}]";
} catch (ProfileNoAcctUriException $e) {
$recipients[$value] = "[?@?] " . $e->profile->getBestName();
$recipients[$value] = '[?@?] ' . $e->profile->getBestName();
}
}
}
@ -357,6 +379,7 @@ class ActivityPubPlugin extends Plugin
* Validate AP-recipients for profile page message action addition
*
* @param Profile $recipient
*
* @return bool hook return value
*/
public function onDirectMessageProfilePageActions(Profile $recipient): bool
@ -374,6 +397,7 @@ class ActivityPubPlugin extends Plugin
*
* @param Profile profile being deleted
* @param array &$related objects with same profile_id to be deleted
*
* @return void
*/
public function onProfileDeleteRelated(Profile $profile, array &$related): void
@ -396,11 +420,12 @@ class ActivityPubPlugin extends Plugin
* Plugin Nodeinfo information
*
* @param array $protocols
*
* @return bool hook true
*/
public function onNodeInfoProtocols(array &$protocols)
{
$protocols[] = "activitypub";
$protocols[] = 'activitypub';
return true;
}
@ -409,8 +434,11 @@ class ActivityPubPlugin extends Plugin
*
* @param HTMLOutputter $out
* @param Profile $profile
* @return boolean hook return value
*
* @throws Exception
*
* @return bool hook return value
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onEndShowAccountProfileBlock(HTMLOutputter $out, Profile $profile)
@ -444,7 +472,9 @@ class ActivityPubPlugin extends Plugin
* could do both search and grab.
*
* @param string $query search query
*
* @return bool hook
*
* @author Bruno Casteleiro <up201505347@fc.up.pt>
*/
public function onStartNoticeSearch(string $query): bool
@ -463,7 +493,7 @@ class ActivityPubPlugin extends Plugin
return false;
}
} elseif (filter_var($query, FILTER_VALIDATE_URL)) { // URL found!
/* Is this an ActivityPub notice? */
// Is this an ActivityPub notice?
// If we already know it, just return
try {
@ -486,7 +516,7 @@ class ActivityPubPlugin extends Plugin
// We will next check if this URL is an actor
}
/* Is this an ActivityPub actor? */
// Is this an ActivityPub actor?
// If we already know it, just return
try {
@ -531,15 +561,15 @@ class ActivityPubPlugin extends Plugin
return true;
}
/********************************************************
* WebFinger Events *
********************************************************/
// WebFinger Events
/**
* Get remote user's ActivityPub_profile via a identifier
*
* @param string $arg A remote user identifier
* @return Activitypub_profile|null Valid profile in success | null otherwise
*
* @return null|Activitypub_profile Valid profile in success | null otherwise
*
* @author GNU social
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
@ -561,9 +591,9 @@ class ActivityPubPlugin extends Plugin
$urls[] = $arg;
}
if (preg_match('!^((?:\w+\.)*\w+(?:\w+\-\w+)*\.\w+(?:/\w+)+)$!', $arg)) {
$schemes = array('http', 'https');
$schemes = ['http', 'https'];
foreach ($schemes as $scheme) {
$urls[] = "$scheme://$arg";
$urls[] = "{$scheme}://{$arg}";
}
}
@ -582,21 +612,23 @@ class ActivityPubPlugin extends Plugin
* 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, $preMention='@')
public static function extractWebfingerIds($text, $preMention = '@')
{
$wmatches = [];
$result = preg_match_all(
'/(?<!\S)'.preg_quote($preMention, '/').'('.Nickname::WEBFINGER_FMT.')/',
'/(?<!\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().').');
common_log(LOG_ERR, __METHOD__ . ': Error parsing webfinger IDs from text (preg_last_error==' . preg_last_error() . ').');
return [];
} elseif (($n_matches = count($wmatches)) != 0) {
common_debug(sprintf('Found %d matches for WebFinger IDs: %s', $n_matches, _ve($wmatches)));
@ -608,23 +640,25 @@ class ActivityPubPlugin extends Plugin
* 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, $preMention='@')
public static function extractUrlMentions($text, $preMention = '@')
{
$wmatches = [];
// 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.']*)*)/',
'/(?:^|\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().').');
common_log(LOG_ERR, __METHOD__ . ': Error parsing profile URL mentions from text (preg_last_error==' . preg_last_error() . ').');
return [];
} elseif (count($wmatches)) {
common_debug(sprintf('Found %d matches for profile URL mentions: %s', count($wmatches), _ve($wmatches)));
@ -637,7 +671,9 @@ class ActivityPubPlugin extends Plugin
*
* @param XML_XRD $xrd
* @param Managed_DataObject $object
*
* @throws Exception
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onEndWebFingerProfileLinks(XML_XRD $xrd, Managed_DataObject $object)
@ -648,7 +684,7 @@ class ActivityPubPlugin extends Plugin
$object->getProfile()->getUri(),
'application/activity+json'
);
$xrd->links[] = clone($link);
$xrd->links[] = clone $link;
}
}
@ -656,11 +692,15 @@ class ActivityPubPlugin extends Plugin
* Find any explicit remote mentions. Accepted forms:
* Webfinger: @user@example.com
* Profile link:
*
* @param Profile $sender
* @param string $text input markup text
* @param $mentions
* @return boolean hook return value
*
* @throws InvalidUrlException
*
* @return bool hook return value
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @example.com/mublog/user
*
@ -672,13 +712,13 @@ class ActivityPubPlugin extends Plugin
foreach (self::extractWebfingerIds($text, '@') as $wmatch) {
list($target, $pos) = $wmatch;
$this->log(LOG_INFO, "Checking webfinger person '$target'");
$this->log(LOG_INFO, "Checking webfinger person '{$target}'");
$profile = null;
try {
$aprofile = Activitypub_profile::ensure_webfinger($target);
$profile = $aprofile->local_profile();
} catch (Exception $e) {
$this->log(LOG_ERR, "Webfinger check failed: " . $e->getMessage());
$this->log(LOG_ERR, 'Webfinger check failed: ' . $e->getMessage());
continue;
}
assert($profile instanceof Profile);
@ -690,34 +730,34 @@ class ActivityPubPlugin extends Plugin
if (!common_valid_http_url($url)) {
$url = $profile->getUrl();
}
$matches[$pos] = array('mentioned' => array($profile),
$matches[$pos] = ['mentioned' => [$profile],
'type' => 'mention',
'text' => $displayName,
'position' => $pos,
'length' => mb_strlen($target),
'url' => $url);
'url' => $url, ];
}
foreach (self::extractUrlMentions($text) as $wmatch) {
list($target, $pos) = $wmatch;
$schemes = array('https', 'http');
$schemes = ['https', 'http'];
foreach ($schemes as $scheme) {
$url = "$scheme://$target";
$this->log(LOG_INFO, "Checking profile address '$url'");
$url = "{$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),
$matches[$pos] = ['mentioned' => [$profile],
'type' => 'mention',
'text' => $displayName,
'position' => $pos,
'length' => mb_strlen($target),
'url' => $profile->getUrl());
'url' => $profile->getUrl(), ];
break;
} catch (Exception $e) {
$this->log(LOG_ERR, "Profile check failed: " . $e->getMessage());
$this->log(LOG_ERR, 'Profile check failed: ' . $e->getMessage());
}
}
}
@ -746,16 +786,18 @@ class ActivityPubPlugin extends Plugin
* @param Command $command
* @param string $arg
* @param Profile &$profile
* @return boolean hook return code
*
* @return bool hook return code
*
* @author GNU social
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onStartCommandGetProfile($command, $arg, &$profile)
{
$aprofile = self::pull_remote_profile($arg);
if ($aprofile instanceof Activitypub_profile) {
try {
$aprofile = $this->pull_remote_profile($arg);
$profile = $aprofile->local_profile();
} else {
} catch (Exception $e) {
// No remote ActivityPub profile found
return true;
}
@ -763,17 +805,17 @@ class ActivityPubPlugin extends Plugin
return false;
}
/********************************************************
* Discovery Events *
********************************************************/
// Discovery Events
/**
* 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)
@ -791,6 +833,7 @@ class ActivityPubPlugin extends Plugin
*
* @param string $uri
* @param Profile &$profile
*
* @return bool
*/
public function onRemoteFollowPullProfile(string $uri, ?Profile &$profile): bool
@ -806,9 +849,7 @@ class ActivityPubPlugin extends Plugin
return is_null($profile);
}
/********************************************************
* Delivery Events *
********************************************************/
// Delivery Events
/**
* Having established a remote subscription, send a notification to the
@ -816,8 +857,11 @@ class ActivityPubPlugin extends Plugin
*
* @param Profile $profile subscriber
* @param Profile $other subscribee
* @return bool return value
*
* @throws HTTP_Request2_Exception
*
* @return bool return value
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onStartSubscribe(Profile $profile, Profile $other)
@ -842,8 +886,11 @@ class ActivityPubPlugin extends Plugin
*
* @param Profile $profile
* @param Profile $other
* @return bool return value
*
* @throws HTTP_Request2_Exception
*
* @return bool return value
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public function onStartUnsubscribe(Profile $profile, Profile $other)
@ -943,6 +990,7 @@ class ActivityPubPlugin extends Plugin
* Federate private message
*
* @param Notice $message
*
* @return void
*/
public function onSendDirectMessage(Notice $message): void
@ -968,17 +1016,20 @@ class ActivityPubPlugin extends Plugin
* original post and show the domain it came from.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*
* @param $notice
* @param $name
* @param $url
* @param $title
* @return mixed hook return code
*
* @throws Exception
*
* @return mixed hook return code
*/
public function onStartNoticeSourceLink($notice, &$name, &$url, &$title)
{
// If we don't handle this, keep the event handler going
if (!in_array($notice->source, array('ActivityPub', 'share'))) {
if (!in_array($notice->source, ['ActivityPub', 'share'])) {
return true;
}
@ -1016,14 +1067,16 @@ class ActivityPubReturn
*
* @param string $res
* @param int $code Status Code
*
* @return void
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function answer($res = '', $code = 202)
{
http_response_code($code);
header('Content-Type: application/activity+json');
echo json_encode($res, JSON_UNESCAPED_SLASHES | (isset($_GET["pretty"]) ? JSON_PRETTY_PRINT : null));
echo json_encode($res, JSON_UNESCAPED_SLASHES | (isset($_GET['pretty']) ? JSON_PRETTY_PRINT : null));
exit;
}
@ -1032,7 +1085,9 @@ class ActivityPubReturn
*
* @param string $m
* @param int $code Status Code
*
* @return void
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function error($m, $code = 400)