--- /dev/null
+<?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
+ // TODO: ignore remote notices and users
+ // Resolve target (https://github.com/converspace/webmention/issues/43)
+ $request = HTTPClient::start();
+
+ try {
+ $response = $request->head($target);
+ } catch(Exception $ex) {
+ return NULL;
+ }
+
+ try {
+ return Notice::fromUri($response->getEffectiveUrl());
+ } catch(UnknownUriException $ex) {
+ preg_match('/\/notice\/(\d+)(?:#.*)?$/', $response->getEffectiveUrl(), $match);
+ return Notice::getKV('id', $match[1]);
+ }
+
+ return NULL;
+}
+
+// Based on https://github.com/acegiak/Semantic-Linkbacks/blob/master/semantic-linkbacks-microformats-handler.php, GPL-2.0+
+function linkback_find_entry($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();
+}
projects / quix0rs-gnu-social.git / commitdiff