Twitter JSON to RSS feed proxy for Twitter API 1.1

twitterfeed.php

<?php

/*
	Via https://gist.github.com/Ben-Atherton/2d86c81c8f390259fd656794cde4e70e for the api auth.
	Via https://gist.github.com/BtbN/3f59269de9487ea9f2e4cc0174f4d23c for the formatting.
	I updated it to do rss insteaed of atom.
*/

$token = '';
$token_secret = '';
$consumer_key = '';
$consumer_secret = '';
$user_screen_name = '';

#region auth

$host = 'api.twitter.com';
$method = 'GET';
$path = '/1.1/statuses/user_timeline.json'; // api call path

$query = array( // query parameters
    'screen_name' => $twitter_name,
    'count' => 20,
    'exclude_replies' => 'true',
    'tweet_mode' => 'extended',
    'contributor_details' => 'false',
);

$oauth = array(
    'oauth_consumer_key' => $consumer_key,
    'oauth_token' => $token,
    'oauth_nonce' => (string)mt_rand(), // a stronger nonce is recommended
    'oauth_timestamp' => time(),
    'oauth_signature_method' => 'HMAC-SHA1',
    'oauth_version' => '1.0'
);

$oauth = array_map("rawurlencode", $oauth); // must be encoded before sorting
$query = array_map("rawurlencode", $query);

$arr = array_merge($oauth, $query); // combine the values THEN sort

asort($arr); // secondary sort (value)
ksort($arr); // primary sort (key)

// http_build_query automatically encodes, but our parameters
// are already encoded, and must be by this point, so we undo
// the encoding step
$querystring = urldecode(http_build_query($arr, '', '&'));

$url = "https://$host$path";

// mash everything together for the text to hash
$base_string = $method."&".rawurlencode($url)."&".rawurlencode($querystring);

// same with the key
$key = rawurlencode($consumer_secret)."&".rawurlencode($token_secret);

// generate the hash
$signature = rawurlencode(base64_encode(hash_hmac('sha1', $base_string, $key, true)));

// this time we're using a normal GET query, and we're only encoding the query params
// (without the oauth params)
$url .= "?".http_build_query($query);
$url=str_replace("&amp;","&",$url); //Patch by @Frewuill

$oauth['oauth_signature'] = $signature; // don't want to abandon all that work!
ksort($oauth); // probably not necessary, but twitter's demo does it

// also not necessary, but twitter's demo does this too
function add_quotes($str) { return '"'.$str.'"'; }
$oauth = array_map("add_quotes", $oauth);

// this is the full value of the Authorization line
$auth = "OAuth " . urldecode(http_build_query($oauth, '', ', '));

// if you're doing post, you need to skip the GET building above
// and instead supply query parameters to CURLOPT_POSTFIELDS
$options = array( CURLOPT_HTTPHEADER => array("Authorization: $auth"),
                  //CURLOPT_POSTFIELDS => $postfields,
                  CURLOPT_HEADER => false,
                  CURLOPT_URL => $url,
                  CURLOPT_RETURNTRANSFER => true,
                  CURLOPT_SSL_VERIFYPEER => false);


// do our business
$feed = curl_init();

curl_setopt_array($feed, $options);

$json = curl_exec($feed);
//echo ('10 ' . $json . '<br />');

curl_close($feed);

# endregion 



	$all = json_decode($json, true);
	
	if (!$all)
	{
	  http_response_code(400);
	  echo 'Could not decode JSON response';
	  print_r($response);
	}
	
	$updated = date(DATE_ATOM, strtotime($all[0]['created_at']));

	header('Content-type: application/rss+xml; charset=UTF-8', true);
	
	$image_url = $all[0]['user']['profile_image_url'];

?>
<rss xmlns:media="http://search.yahoo.com/mrss/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/" version="2.0">
<channel>
<title>@<?php echo $user_screen_name ?> on Twitter</title>
<description>@<?php echo $user_screen_name ?> on Twitter</description>
<pubDate><?php echo date(DATE_RSS, strtotime($updated))?></pubDate>
<link>https://twitter.com/<?php echo $user_screen_name ?></link>
<atom:link href="https://<?php echo $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"]?>" rel="self" type="application/rss+xml"/>
<image>
 <link>https://twitter.com/<?php echo $user_screen_name ?></link>
 <url><?php echo $image_url ?></url>
 <title>@<?php echo $user_screen_name ?> on Twitter</title>
</image>

<?php
    foreach($all as $row)
    {
        $id = $row['id_str'];
        $text = $row['full_text'];
        $is_retweet = isset($row['retweeted_status']);
        if($is_retweet)
        {
            $title = $row['retweeted_status']['full_text'];
            $entry = "RT @" . $row['retweeted_status']['user']['screen_name'] . ": "  . $row['retweeted_status']['full_text'];
        } else {
            $title = $text;
            $entry = $text;
		}
        $expansion_target = $row;

        if($is_retweet)
        {
            $expansion_target = $row['retweeted_status'];
        }	
        
        if(isset($expansion_target['entities']) and isset($expansion_target['entities']['urls'])) 
        {
            // expand t.co URLs
            $urls = $expansion_target['entities']['urls'];
            foreach($urls as $url)
            {
                $url_orig = $url['url'];
                $url_expanded = $url['expanded_url'];
				// don't link twitter and youtube urls so reader can embed them.
                if (preg_match("/\b(twitter.com|youtube.com|youtu.be|instagram.com)\b/i", $url_expanded)) {
                   $url_expanded_tagged = "<br /><br />" . $url_expanded;
                } else {
                   $url_expanded_tagged = "<br /><br /><a href='$url_expanded'>$url_expanded</a>";
                } 
                $title = str_replace($url_orig, "", $title);
                $entry = str_replace($url_orig, $url_expanded_tagged, $entry);
            }
      }

      if(isset($expansion_target['extended_entities']) and isset($expansion_target['extended_entities']['media']))
      {
            $media = $expansion_target['extended_entities']['media'];
            foreach($media as $medium)
            {
                $medium_orig = $medium['url'];
                $medium_raw = $medium['media_url_https'];
                $medium_display = $medium['display_url'];
                $medium_expanded = $medium['expanded_url'];
                $medium_expanded_tagged = "<br /><br /><a href='$medium_expanded'><img src='$medium_raw'></img></a>";
                $title = str_replace($medium_orig, "", $title);
                $entry = str_replace($medium_orig, $medium_expanded_tagged, $entry);
            }
      }
 
      $name = htmlspecialchars($row['user']['name']);
      $screen_name = $row['user']['screen_name'];
      $url = $row['user']['url'];
      $profile_image_url = $row['user']['profile_image_url'];
      $source = htmlspecialchars($row['source']);
      //$entry = htmlspecialchars($entry);
      $title = htmlspecialchars($title);
      $created = date(DATE_ATOM, strtotime($row['created_at']));
	  
      // replace line breaks with spaces
      $title = trim(preg_replace('/\s+/', ' ', $title));

      // get first sentence
      $title = preg_replace('/(.*?[?!.](?=\s|$)).*/', '\\1', $title);	  

      // remove final period
      $title = trim($title, '.');
 
?>
   <item>
    <title><?php echo $title?></title>
    <link>http://twitter.com/<?php echo $screen_name?>/status/<?php echo $id?></link>
    <description>
     <![CDATA[ <?php echo $entry ?> ]]>
    </description>
    <pubDate><?php echo date(DATE_RSS, strtotime($created))?></pubDate>
    <dc:creator><?php echo $name?></dc:creator>
    <guid isPermaLink="false">https://twitter.com/<?php echo $screen_name?>/status/<?php echo $id?></guid>
   </item>

<?php
	}
?>
</channel>
</rss>