gnu-social/plugins/Linkback/lib/util.php

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<?php
function linkback_lenient_target_match($body, $target) {
return strpos(''.$body, str_replace(array('http://www.', 'http://', 'https://www.', 'https://'), '', preg_replace('/\/+$/', '', preg_replace( '/#.*/', '', $target))));
}
function linkback_get_source($source, $target) {
$request = HTTPClient::start();
try {
$response = $request->get($source);
} catch(Exception $ex) {
return NULL;
}
$body = htmlspecialchars_decode($response->getBody());
// We're slightly more lenient in our link detection than the spec requires
if(!linkback_lenient_target_match($body, $target)) {
return NULL;
}
return $response;
}
function linkback_get_target($target) {
// TODO: linkback to a user should work for attention
// Resolve target (https://github.com/converspace/webmention/issues/43)
$request = HTTPClient::start();
try {
$response = $request->head($target);
} catch(Exception $ex) {
return NULL;
}
try {
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$notice = Notice::fromUri($response->getEffectiveUrl());
} catch(UnknownUriException $ex) {
preg_match('/\/notice\/(\d+)(?:#.*)?$/', $response->getEffectiveUrl(), $match);
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$notice = Notice::getKV('id', $match[1]);
}
if($notice instanceof Notice && $notice->isLocal()) {
return $notice;
}
return NULL;
}
// Based on https://github.com/acegiak/Semantic-Linkbacks/blob/master/semantic-linkbacks-microformats-handler.php, GPL-2.0+
function linkback_find_entry($mf2, $target) {
if(isset($mf2['items'][0]['type']) && in_array("h-feed", $mf2['items'][0]["type"]) && isset($mf2['items'][0]['children'])) {
$mf2['items'] = $mf2['items'][0]['children'];
}
$entries = array_filter($mf2['items'], function($x) { return isset($x['type']) && in_array('h-entry', $x['type']); });
foreach ($entries as $entry) {
foreach ((array)$entry['properties'] as $key => $values) {
if(count(array_filter($values, function($x) use ($target) { return linkback_lenient_target_match($x, $target); })) > 0) {
return $entry['properties'];
}
// check included h-* formats and their links
foreach ($values as $obj) {
if(isset($obj['type']) && array_intersect(array('h-cite', 'h-entry'), $obj['type']) &&
isset($obj['properties']) && isset($obj['properties']['url']) &&
count(array_filter($obj['properties']['url'],
function($x) use ($target) { return linkback_lenient_target_match($x, $target); })) > 0
) {
return $entry['properties'];
}
}
// check content for the link
if ($key == "content" && preg_match_all("/<a[^>]+?".preg_quote($target, "/")."[^>]*>([^>]+?)<\/a>/i", htmlspecialchars_decode($values[0]['html']), $context)) {
return $entry['properties'];
// check summary for the link
} elseif ($key == "summary" && preg_match_all("/<a[^>]+?".preg_quote($target, "/")."[^>]*>([^>]+?)<\/a>/i", htmlspecialchars_decode($values[0]), $context)) {
return $entry['properties'];
}
}
}
// Default to first one
if(count($entries) > 0) {
return $entries[0]['properties'];
}
return NULL;
}
function linkback_entry_type($entry, $mf2, $target) {
if(!$entry) { return 'mention'; }
if($mf2['rels'] && $mf2['rels']['in-reply-to']) {
foreach($mf2['rels']['in-reply-to'] as $url) {
if(linkback_lenient_target_match($url, $target)) {
return 'reply';
}
}
}
$classes = array(
'in-reply-to' => 'reply',
'repost-of' => 'repost',
'like-of' => 'like',
'tag-of' => 'tag'
);
foreach((array)$entry as $key => $values) {
if(count(array_filter($values, function($x) use ($target) { return linkback_lenient_target_match($x, $target); })) > 0) {
if($classes[$key]) { return $classes[$key]; }
}
foreach ($values as $obj) {
if(isset($obj['type']) && array_intersect(array('h-cite', 'h-entry'), $obj['type']) &&
isset($obj['properties']) && isset($obj['properties']['url']) &&
count(array_filter($obj['properties']['url'],
function($x) use ($target) { return linkback_lenient_target_match($x, $target); })) > 0
) {
if($classes[$key]) { return $classes[$key]; }
}
}
}
return 'mention';
}
function linkback_is_dupe($key, $url) {
$dupe = Notice::getKV('uri', $url);
if ($dupe instanceof Notice) {
common_log(LOG_INFO, "Linkback: ignoring duplicate post: $url");
return $dupe;
}
return false;
}
function linkback_hcard($mf2, $url) {
if(empty($mf2['items'])) {
return null;
}
$hcards = array();
foreach($mf2['items'] as $item) {
if(!in_array('h-card', $item['type'])) {
continue;
}
// We found a match, return it immediately
if(isset($item['properties']['url']) && in_array($url, $item['properties']['url'])) {
return $item['properties'];
// Let's keep all the hcards for later, to return one of them at least
$hcards[] = $item['properties'];
}
}
// No match immediately for the url we expected, but there were h-cards found
if (count($hcards) > 0) {
return $hcards[0];
}
return null;
}
function linkback_notice($source, $notice, $entry, $author, $mf2) {
$content = $entry['content'] ? $entry['content'][0]['html'] :
($entry['summary'] ? $entry['sumary'][0] : $entry['name'][0]);
$rendered = common_purify($content);
if($entry['type'] == 'mention') {
$name = $entry['name'] ? $entry['name'][0] : substr(common_strip_html($content), 0, 20).'…';
$rendered = _m('linked to this from <a href="'.htmlspecialchars($source).'">'.htmlspecialchars($name).'</a>');
}
$content = common_strip_html($rendered);
$shortened = common_shorten_links($content);
if(Notice::contentTooLong($shortened)) {
$content = substr($content,
0,
Notice::maxContent() - (mb_strlen($source) + 2));
$rendered = $content . '<a href="'.htmlspecialchars($source).'">…</a>';
$content .= ' ' . $source;
}
$options = array('is_local' => Notice::REMOTE,
'url' => $entry['url'][0],
'uri' => $source,
'rendered' => $rendered,
'replies' => array(),
'groups' => array(),
'peopletags' => array(),
'tags' => array(),
'urls' => array());
// TODO: when mentioning a user and not a post, neither of these but set replies above
if($entry['type'] == 'repost') {
$options['repeat_of'] = $notice->id;
} else {
$options['reply_to'] = $notice->id;
}
if($entry['published'] || $entry['updated']) {
$options['created'] = $entry['published'] ? common_sql_date($entry['published'][0]) : common_sql_date($entry['updated'][0]);
}
if($entry['photo']) {
$options['urls'][] = $entry['photo'][0];
}
foreach((array)$entry['category'] as $tag) {
$tag = common_canonical_tag($tag);
if($tag) { $options['tags'][] = $tag; }
}
if($mf2['rels'] && $mf2['rels']['enclosure']) {
foreach($mf2['rels']['enclosure'] as $url) {
$options['urls'][] = $url;
}
}
if($mf2['rels'] && $mf2['rels']['tag']) {
foreach($mf2['rels']['tag'] as $url) {
preg_match('/\/([^\/]+)\/*$/', $url, $match);
$tag = common_canonical_tag($match[1]);
if($tag) { $options['tags'][] = $tag; }
}
}
if($entry['type'] != 'reply' && $entry['type'] != 'repost') {
$options['urls'] = array();
}
return array($content, $options);
}
function linkback_profile($entry, $mf2, $response, $target) {
if(isset($entry['properties']['author']) && isset($entry['properties']['author'][0]['properties'])) {
$author = $entry['properties']['author'][0]['properties'];
} else {
$author = linkback_hcard($mf2, $response->getEffectiveUrl());
}
if(!$author) {
$author = array('name' => array($entry['name']));
}
if(!$author['url']) {
$author['url'] = array($response->getEffectiveUrl());
}
$user = User::getKV('uri', $author['url'][0]);
if ($user instanceof User) {
common_log(LOG_INFO, "Linkback: ignoring linkback from local user: $url");
return true;
}
$profile = Profile::fromUri($author['url'][0]);
if(!($profile instanceof Profile)) {
$profile = Profile::getKV('profileurl', $author['url'][0]);
}
if(!($profile instanceof Profile)) {
$profile = new Profile();
$profile->profileurl = $author['url'][0];
$profile->fullname = $author['name'][0];
$profile->nickname = $author['nickname'] ? $author['nickname'][0] : str_replace(' ', '', $author['name'][0]);
$profile->created = common_sql_now();
$profile->insert();
}
return array($profile, $author);
}
function linkback_save($source, $target, $response, $notice) {
if($dupe = linkback_is_dupe('uri', $response->getEffectiveUrl())) { return $dupe->getLocalUrl(); }
if($dupe = linkback_is_dupe('url', $response->getEffectiveUrl())) { return $dupe->getLocalUrl(); }
if($dupe = linkback_is_dupe('uri', $source)) { return $dupe->getLocalUrl(); }
if($dupe = linkback_is_dupe('url', $source)) { return $dupe->getLocalUrl(); }
$mf2 = new Mf2\Parser($response->getBody(), $response->getEffectiveUrl());
$mf2 = $mf2->parse();
$entry = linkback_find_entry($mf2, $target);
if(!$entry) {
preg_match('/<title>([^<]+)', $response->getBody(), $match);
$entry = array(
'content' => array('html' => $response->getBody()),
'name' => $match[1] ? htmlspecialchars_decode($match[1]) : $source
);
}
if(!$entry['url']) {
$entry['url'] = array($response->getEffectiveUrl());
}
if($dupe = linkback_is_dupe('uri', $entry['url'][0])) { return $dupe->getLocalUrl(); }
if($dupe = linkback_is_dupe('url', $entry['url'][0])) { return $dupe->getLocalUrl(); }
$entry['type'] = linkback_entry_type($entry, $mf2, $target);
list($profile, $author) = linkback_profile($entry, $mf2, $response, $target);
list($content, $options) = linkback_notice($source, $notice, $entry, $author, $mf2);
if($entry['type'] == 'like' || ($entry['type'] == 'reply' && $entry['rsvp'])) {
$act = new Activity();
$act->type = ActivityObject::ACTIVITY;
$act->time = $options['created'] ? strtotime($options['created']) : time();
$act->title = $entry["name"] ? $entry["name"][0] : _m("Favor");
$act->actor = $profile->asActivityObject();
$act->target = $notice->asActivityObject();
$act->objects = array(clone($act->target));
// TRANS: Message that is the "content" of a favorite (%1$s is the actor's nickname, %2$ is the favorited
// notice's nickname and %3$s is the content of the favorited notice.)
$act->content = sprintf(_('%1$s favorited something by %2$s: %3$s'),
$profile->getNickname(), $notice->getProfile()->getNickname(),
$notice->rendered ?: $notice->content);
if($entry['rsvp']) {
$act->content = $options['rendered'];
}
$act->verb = ActivityVerb::FAVORITE;
if(strtolower($entry['rsvp'][0]) == 'yes') {
$act->verb = 'http://activitystrea.ms/schema/1.0/rsvp-yes';
} else if(strtolower($entry['rsvp'][0]) == 'no') {
$act->verb = 'http://activitystrea.ms/schema/1.0/rsvp-no';
} else if(strtolower($entry['rsvp'][0]) == 'maybe') {
$act->verb = 'http://activitystrea.ms/schema/1.0/rsvp-maybe';
}
$act->id = $source;
$act->link = $entry['url'][0];
$options['source'] = 'linkback';
$options['mentions'] = $options['replies'];
unset($options['reply_to']);
unset($options['repeat_of']);
try {
$saved = Notice::saveActivity($act, $profile, $options);
} catch (Exception $e) {
common_log(LOG_ERR, "Linkback save of remote message $source failed: " . $e->getMessage());
return false;
}
common_log(LOG_INFO, "Linkback saved remote message $source as notice id $saved->id");
} else {
// Fallback is to make a notice manually
try {
$saved = Notice::saveNew($profile->id,
$content,
'linkback',
$options);
} catch (Exception $e) {
common_log(LOG_ERR, "Linkback save of remote message $source failed: " . $e->getMessage());
return false;
}
common_log(LOG_INFO, "Linkback saved remote message $source as notice id $saved->id");
}
return $saved->getLocalUrl();
}