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<?php
namespace p3k\XRay\Formats;
use DateTime;
use \p3k\XRay\PostType;
class ActivityStreams extends Format {
public static function is_as2_json($document) {
if(is_array($document) && isset($document['@context'])) {
if(is_string($document['@context']) && $document['@context'] == 'https://www.w3.org/ns/activitystreams')
return true;
if(is_array($document['@context']) && in_array('https://www.w3.org/ns/activitystreams', $document['@context']))
return true;
}
return false;
}
public static function matches_host($url) {
return true;
}
public static function matches($url) {
return true;
}
public static function parse($http_response, $http, $opts=[]) {
$as2 = $http_response['body'];
$url = $http_response['url'];
if(!isset($as2['type']))
return false;
if($as2['type'] == 'Create' && is_array($as2['object'])) {
// Extract the object and parse that instead
$as2 = $as2['object'];
}
switch($as2['type']) {
case 'Person':
return self::parseAsHCard($as2, $url, $http, $opts);
case 'Article':
case 'Note':
case 'Announce': // repost
case 'Like': // like
return self::parseAsHEntry($as2, $url, $http, $opts);
}
$result = [
'data' => [
'type' => 'unknown',
],
'url' => $url,
'code' => $http_response['code'],
];
return $result;
}
private static function parseAsHEntry($as2, $url, $http, $opts) {
$data = [
'type' => 'entry'
];
$refs = [];
if(isset($as2['url']))
$data['url'] = $as2['url'];
elseif(isset($as2['id']))
$data['url'] = $as2['id'];
if(isset($as2['published'])) {
try {
$date = new DateTime($as2['published']);
$data['published'] = $date->format('c');
} catch(\Exception $e){}
} elseif(isset($as2['signature']['created'])) {
// Pull date from the signature if there isn't one in the activity
try {
$date = new DateTime($as2['signature']['created']);
$data['published'] = $date->format('c');
} catch(\Exception $e){}
}
if(isset($as2['name'])) {
$data['name'] = $as2['name'];
}
if(isset($as2['summary'])) {
$data['summary'] = $as2['summary'];
}
if(isset($as2['content'])) {
$html = trim(self::sanitizeHTML($as2['content']));
$text = trim(self::stripHTML($html));
$data['content'] = [
'text' => $text
];
if($html && $text && $text != $html) {
$data['content']['html'] = $html;
}
}
if(isset($as2['tag']) && is_array($as2['tag'])) {
$emoji = [];
$category = [];
foreach($as2['tag'] as $tag) {
if(is_array($tag) && isset($tag['name']) && isset($tag['type']) && $tag['type'] == 'Hashtag')
$category[] = trim($tag['name'], '#');
if(is_array($tag) && isset($tag['type']) && $tag['type'] == 'Emoji' && isset($tag['icon']['url'])) {
$emoji[$tag['name']] = $tag['icon']['url'];
}
}
if(count($category))
$data['category'] = $category;
if(count($emoji) && isset($data['content']['html'])) {
foreach($emoji as $code=>$img) {
$data['content']['html'] = str_replace($code, '<img src="'.$img.'" alt="'.$code.'" title="'.$code.'" height="24" class="xray-emoji">', $data['content']['html']);
}
}
}
if(isset($as2['inReplyTo'])) {
$data['in-reply-to'] = [$as2['inReplyTo']];
}
// Photos and Videos
if(isset($as2['attachment'])) {
$photos = [];
$videos = [];
foreach($as2['attachment'] as $attachment) {
if(strpos($attachment['mediaType'], 'image/') !== false) {
$photos[] = $attachment['url'];
}
if(strpos($attachment['mediaType'], 'video/') !== false) {
$videos[] = $attachment['url'];
}
}
if(count($photos))
$data['photo'] = $photos;
if(count($videos))
$data['video'] = $videos;
}
// Fetch the author info, which requires an HTTP request
$authorURL = false;
if(isset($as2['attributedTo']) && is_string($as2['attributedTo'])) {
$authorURL = $as2['attributedTo'];
} elseif(isset($as2['actor']) && is_string($as2['actor'])) {
$authorURL = $as2['actor'];
}
if($authorURL) {
$authorResponse = $http->get($authorURL, ['Accept: application/activity+json,application/json']);
if($authorResponse && !empty($authorResponse['body'])) {
$authorProfile = json_decode($authorResponse['body'], true);
$author = self::parseAsHCard($authorProfile, $authorURL, $http, $opts);
if($author && !empty($author['data']))
$data['author'] = $author['data'];
}
}
// If this is a repost, fetch the reposted content
if($as2['type'] == 'Announce' && isset($as2['object']) && is_string($as2['object'])) {
$data['repost-of'] = [$as2['object']];
$reposted = $http->get($as2['object'], ['Accept: application/activity+json,application/json']);
if($reposted && !empty($reposted['body'])) {
$repostedData = json_decode($reposted['body'], true);
if($repostedData) {
$reposted['body'] = $repostedData;
$repost = self::parse($reposted, $http, $opts);
if($repost && isset($repost['data']) && $repost['data']['type'] != 'unknown') {
$refs[$as2['object']] = $repost['data'];
}
}
}
}
// If this is a like, fetch the liked post
if($as2['type'] == 'Like' && isset($as2['object']) && is_string($as2['object'])) {
$data['like-of'] = [$as2['object']];
$liked = $http->get($as2['object'], ['Accept: application/activity+json,application/json']);
if($liked && !empty($liked['body'])) {
$likedData = json_decode($liked['body'], true);
if($likedData) {
$liked['body'] = $likedData;
$like = self::parse($liked, $http, $opts);
if($like && isset($like['data']['type']) && $like['data']['type'] != 'unknown') {
$refs[$as2['object']] = $like['data'];
}
}
}
}
$data['post-type'] = PostType::discover($data);
$response = [
'data' => $data,
];
if(count($refs)) {
$response['data']['refs'] = $refs;
}
return $response;
}
private static function parseAsHCard($as2, $url, $http, $opts) {
$data = [
'type' => 'card',
'name' => null,
'url' => null,
'photo' => null
];
if(!empty($as2['name']))
$data['name'] = $as2['name'];
elseif(isset($as2['preferredUsername']))
$data['name'] = $as2['preferredUsername'];
if(isset($as2['preferredUsername']))
$data['nickname'] = $as2['preferredUsername'];
if(isset($as2['url']))
$data['url'] = $as2['url'];
if(isset($as2['icon']) && isset($as2['icon']['url']))
$data['photo'] = $as2['icon']['url'];
// TODO: featured image for h-cards?
// if(isset($as2['image']) && isset($as2['image']['url']))
// $data['featured'] = $as2['image']['url'];
$response = [
'data' => $data
];
return $response;
}
}