postToBluesky.php

<?php

/*
Pass in an array of data that includes the text of the post and an access token e.g.
postToBluesky(array(
  'text'        => 'Hello World',
  'accessToken' => getBlueskyToken()
 ));
 Here's the gist for getting getBlueskyToken():
 https://gist.github.com/adactio/1a850920a0554a49f36daf79d776a440
 */

function postToBluesky($data=array()) {

    $url = 'https://bsky.social/xrpc/com.atproto.repo.createRecord';

    $fields = array(
        'collection'    => 'app.bsky.feed.post',
        'repo'          => 'adactio.com',
        'record'        => array(
            '$type'     => 'app.bsky.feed.post',
            'text'      => $data['text'],
            'createdAt' => date(DATE_ATOM)
        )
    );

    if (isset($data['embed'])) {
        $fields['record']['embed'] = $data['embed'];
    }

    $regex = '/(https?:\/\/[^\s]+)/';
    preg_match_all($regex, $data['text'], $matches, PREG_OFFSET_CAPTURE);
 
    $links = array();

    foreach ($matches[0] as $match) {
        $urlstring = $match[0];
        $start = $match[1];
        $end = $start + strlen($urlstring);

        $links[] = array(
            'start' => $start,
            'end'   => $end,
            'url'   => $urlstring
        );
    }

    if (!empty($links)) {
        $facets = array();
        foreach ($links as $link) {
            $facets[] = array(
                'index' => array(
                    'byteStart' => $link['start'],
                    'byteEnd'   => $link['end'],
                ),
                'features' => array(
                    array(
                        '$type' => 'app.bsky.richtext.facet#link',
                        'uri'   => $link['url'], 
                    ),
                )
            );
        }
        $fields['record']['facets'] =  $facets;
    }

    $headers = array(
        "Authorization: Bearer ".$data['accessToken'],
        "Content-Type: application/json",
        "Accept: application/json",
        "Accept-Charset: utf-8"
    );

    $options = array(
        CURLOPT_URL => $url,
        CURLOPT_USERAGENT => "adactio.com",
        CURLOPT_RETURNTRANSFER => TRUE,
        CURLOPT_POST => TRUE,
        CURLOPT_HTTPHEADER => $headers,
        CURLOPT_POSTFIELDS => json_encode($fields, JSON_UNESCAPED_SLASHES),
        CURLOPT_TIMEOUT => 5
    );
  
    $curl = curl_init();
    curl_setopt_array($curl, $options);
    $response = curl_exec($curl);
    curl_close($curl);

    return json_decode($response, true);

}