add initial support for enclosures

[tweeper.git] / tweeper.php

diff --git a/tweeper.php b/tweeper.php
old mode 100755 (executable)
new mode 100644 (file)
index 2e27a0d..cd2c3ba
--- a/tweeper.php
+++ b/tweeper.php
@@ -20,6 +20,50 @@
 
 date_default_timezone_set('UTC');
 
+function str_to_gmdate($date)
+{
+  $timestamp = strtotime($date);
+  return epoch_to_gmdate($timestamp);
+}
+
+function epoch_to_gmdate($timestamp)
+{
+  return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT';
+}
+
+function get_url_info($url)
+{
+  $ch = curl_init($url);
+  curl_setopt_array($ch, array(
+      CURLOPT_HEADER => TRUE,          // get the header
+      CURLOPT_NOBODY => TRUE,          // don't donwload body
+      CURLOPT_FOLLOWLOCATION => TRUE,  // the magic sauce
+      CURLOPT_RETURNTRANSFER => TRUE,
+      CURLOPT_SSL_VERIFYHOST => FALSE, // suppress certain SSL errors
+      CURLOPT_SSL_VERIFYPEER => FALSE,
+  ));
+  curl_exec($ch);
+  $url_info = curl_getinfo($ch);;
+  curl_close($ch);
+
+  return $url_info;
+}
+
+function generate_enclosure($url) {
+  $url_info = get_url_info($url);
+
+  $dom = new DomDocument();
+  $enc = $dom->createElement('enclosure');
+  $enc->setAttribute( 'url', $url_info['url']);
+  $enc->setAttribute( 'length', $url_info['download_content_length']);
+  $enc->setAttribute( 'type', $url_info['content_type']);
+
+  $dom->appendChild($enc);
+
+  return $dom->saveXML($enc);
+}
+
+
 class Tweeper {
 
   private $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0";
@@ -31,6 +75,7 @@ class Tweeper {
     $xslDoc->loadXML($stylesheet_contents);
 
     $this->xsltProcessor = new XSLTProcessor();
+    $this->xsltProcessor->registerPHPFunctions();
     $this->xsltProcessor->importStylesheet($xslDoc);
   }
 
@@ -67,20 +112,35 @@ class Tweeper {
   }
 }
 
-if (isset($_GET['screen_name'])) {
-  $screen_name = $_GET['screen_name'];
-} else if (isset($argv[1])) {
-  $screen_name = $argv[1];
-} else {
-  if (isset($_SERVER['SCRIPT_NAME']))
-    $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?screen_name=<screen_name>");
+function usage($argv)
+{
+  if (php_sapi_name() != 'cli')
+    $usage = htmlentities("{$_SERVER['SCRIPT_NAME']}?src_url=<src_url>");
   else
-    $usage = "{$argv[0]} <screen_name>\n";
+    $usage = "{$argv[0]} <src_url>\n";
+
+  return "usage: $usage";
+}
 
-  die("usage: $usage");
+if (isset($_GET['src_url'])) {
+  $src_url = $_GET['src_url'];
+} else if (isset($argv[1])) {
+  if ($argv[1] == "-h" || $argv[1] == "--help") {
+    echo usage($argv);
+    return 0;
+  }
+  $src_url = $argv[1];
+} else {
+  die(usage($argv));
 }
 
-$tweeper = new Tweeper('twitter_user_timeline2rss.xsl');
+$url = parse_url($src_url);
+if (FALSE === $url || empty($url["host"]))
+  die("Invalid url: $src_url\n");
+
+$stylesheet = __DIR__ . "/rss_converter_" . $url["host"] . ".xsl";
+if (FALSE === file_exists($stylesheet))
+  die("Conversion to RSS not supported: {$url["host"]}\n");
 
-$src_uri = 'https://twitter.com/' . $screen_name;
-echo $tweeper->tweep($src_uri);
+$tweeper = new Tweeper($stylesheet);
+echo $tweeper->tweep($src_url);