XRay/lib/XRay/Formats/ActivityStreams.php

<?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($as2, $url, $http, $opts=[]) {
    if(!isset($as2['type']))
      return false;

    switch($as2['type']) {
      case 'Person':
        return self::parseAsHCard($as2, $url, $http, $opts);
      case 'Note':
        return self::parseAsHEntry($as2, $url, $http, $opts);
    }

    $result = [
      'data' => [
        'type' => 'unknown',
      ],
      'url' => $url,
    ];
    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){}
    }

    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-custom-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
    if(isset($as2['attributedTo']) && is_string($as2['attributedTo'])) {
      $authorResponse = $http->get($as2['attributedTo'], ['Accept: application/activity+json,application/json']);
      if($authorResponse && !empty($authorResponse['body'])) {
        $authorProfile = json_decode($authorResponse['body'], true);
        $author = self::parseAsHCard($authorProfile, $as2['attributedTo'], $http, $opts);
        if($author && !empty($author['data']))
          $data['author'] = $author['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;
  }

}