X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/f82b9f8a651307d7c6ba52c2d1d7da3dcc696189..df627f368a58ca224b48000846bef9152d30d987:/tweeper.php?ds=inline

diff --git a/tweeper.php b/tweeper.php
index bdba04d..1d50f60 100644
--- a/tweeper.php
+++ b/tweeper.php
@@ -20,108 +20,150 @@
 
 date_default_timezone_set('UTC');
 
-define('USER_AGENT', 'Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0');
+class Tweeper {
 
-function str_to_gmdate($date)
-{
-  $timestamp = strtotime($date);
-  return epoch_to_gmdate($timestamp);
-}
+  private static $USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0";
 
-function epoch_to_gmdate($timestamp)
-{
-  return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT';
-}
+  public function __construct($stylesheet, $generate_enclosure = FALSE) {
+    $stylesheet_contents = $this->get_contents($stylesheet);
 
-function get_url_info($url)
-{
-  $ch = curl_init($url);
-  curl_setopt_array($ch, array(
+    $xslDoc = new DOMDocument();
+    $xslDoc->loadXML($stylesheet_contents);
+
+    $this->xsltProcessor = new XSLTProcessor();
+    $this->xsltProcessor->registerPHPFunctions();
+    $this->xsltProcessor->setParameter('', 'generateEnclosure', $generate_enclosure);
+    $this->xsltProcessor->importStylesheet($xslDoc);
+  }
+
+  public static function epoch_to_gmdate($timestamp)
+  {
+    return gmdate('D, d M Y H:i:s', $timestamp) . ' GMT';
+  }
+
+  public static function str_to_gmdate($date)
+  {
+    $timestamp = strtotime($date);
+    return Tweeper::epoch_to_gmdate($timestamp);
+  }
+
+  private static function get_contents($url)
+  {
+    $ch = curl_init($url);
+    curl_setopt_array($ch, array(
+      CURLOPT_HEADER => FALSE,
+      CURLOPT_FOLLOWLOCATION => TRUE,  // follow http redirects to get the real URL
+      CURLOPT_RETURNTRANSFER => TRUE,
+      CURLOPT_SSL_VERIFYHOST => FALSE,
+      CURLOPT_SSL_VERIFYPEER => FALSE,
+      CURLOPT_HTTPHEADER => array('Accept-language: en'),
+      CURLOPT_USERAGENT => Tweeper::$USER_AGENT,
+    ));
+    $contents = curl_exec($ch);
+    curl_close($ch);
+
+    return $contents;
+  }
+
+  private static function get_info($url)
+  {
+    $ch = curl_init($url);
+    curl_setopt_array($ch, array(
       CURLOPT_HEADER => TRUE,
       CURLOPT_NOBODY => TRUE,
       CURLOPT_FOLLOWLOCATION => TRUE,  // follow http redirects to get the real URL
       CURLOPT_RETURNTRANSFER => TRUE,
       CURLOPT_SSL_VERIFYHOST => FALSE,
       CURLOPT_SSL_VERIFYPEER => FALSE,
-      CURLOPT_USERAGENT => USER_AGENT,
-  ));
-  curl_exec($ch);
-  $url_info = curl_getinfo($ch);;
-  curl_close($ch);
-
-  return $url_info;
-}
+      CURLOPT_USERAGENT => Tweeper::$USER_AGENT,
+    ));
+    curl_exec($ch);
+    $url_info = curl_getinfo($ch);
+    curl_close($ch);
 
-function generate_enclosure($url)
-{
-  $url_info = get_url_info($url);
-
-  switch($url_info['content_type']) {
-    case "video/avi":
-    case "image/gif":
-    case "image/jpeg":
-    case "audio/x-midi":
-    case "audio/mpeg":
-    case "video/mpeg":
-    case "audio/vorbis":
-    case "application/ogg":
-    case "audio/webm":
-    case "audio/aac":
-    case "audio/mp4":
-    case "audio/wav":
-    case "video/mp4":
-    case "video/ogg":
-      $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);
-    default:
-        return;
+    return $url_info;
   }
-}
 
+  public static function generate_enclosure($url)
+  {
+    $supported_content_types = array(
+      "application/ogg",
+      "audio/aac",
+      "audio/mp4",
+      "audio/mpeg",
+      "audio/vorbis",
+      "audio/wav",
+      "audio/webm",
+      "audio/x-midi",
+      "image/gif",
+      "image/jpeg",
+      "video/avi",
+      "video/mp4",
+      "video/mpeg",
+      "video/ogg",
+    );
 
-class Tweeper {
+    $url_info = Tweeper::get_info($url);
 
-  public function __construct($stylesheet, $generate_enclosure = FALSE) {
-    $stylesheet_contents = $this->get_contents($stylesheet);
+    $supported = in_array($url_info['content_type'], $supported_content_types);
+    if (!$supported) {
+      error_log("Unsupported enclosure content type \"" . $url_info['content_type'] . "\" for URL: " . $url_info['url']);
+      return '';
+    }
 
-    $xslDoc = new DOMDocument();
-    $xslDoc->loadXML($stylesheet_contents);
+    $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']);
 
-    $this->xsltProcessor = new XSLTProcessor();
-    $this->xsltProcessor->registerPHPFunctions();
-    $this->xsltProcessor->setParameter('', 'generateEnclosure', $generate_enclosure);
-    $this->xsltProcessor->importStylesheet($xslDoc);
+    $dom->appendChild($enc);
+
+    return $dom->saveXML($enc);
   }
 
-  private function get_contents($uri) {
-    # https://www.wjsams.com/c/docs/Wiki/Php-HowToSetUserAgentOnFileGetContents
-    $opts = array(
-      'http' => array(
-        'method' => "GET",
-        'header' => join(array(
-          "Accept-language: en\r\n",
-          "User-Agent: {" + USER_AGENT + "}\r\n"
-        ))
-      )
-    );
+  /* Mimic the message from libxml.c::php_libxml_ctx_error_level() */
+  private function log_xml_error($error) {
+    $output = "";
 
-    $context = stream_context_create($opts);
-    $contents = file_get_contents($uri, false, $context);
-    return $contents;
+    switch ($error->level) {
+    case LIBXML_ERR_WARNING:
+      $output .= "Warning $error->code: ";
+      break;
+    case LIBXML_ERR_ERROR:
+      $output .= "Error $error->code: ";
+      break;
+    case LIBXML_ERR_FATAL:
+      $output .= "Fatal Error $error->code: ";
+      break;
+    }
+
+    $output .= trim($error->message);
+
+    if ($error->file) {
+      $output .= " in $error->file";
+    } else {
+      $output .= " in Entity,";
+    }
+
+    $output .=" line $error->line";
+
+    error_log($output);
   }
 
   public function tweep($uri) {
-    $html = $this->get_contents($uri);
+    $html = Tweeper::get_contents($uri);
 
     $xmlDoc = new DOMDocument();
+
+    // Handle warnings and errors when loading invalid HTML.
+    $xml_errors_value = libxml_use_internal_errors(true);
     $xmlDoc->loadHTML($html);
+    foreach (libxml_get_errors() as $xml_error) {
+      $this->log_xml_error($xml_error);
+    }
+    libxml_clear_errors();
+    libxml_use_internal_errors($xml_errors_value);
 
     $output = $this->xsltProcessor->transformToXML($xmlDoc);
 
@@ -163,7 +205,8 @@ function parse_options_cli($argv, $argc)
       echo usage($argv);
       exit(0);
     default:
-      die(usage($argv));
+      fwrite(STDERR, usage($argv));
+      exit(1);
     }
   }
 
@@ -188,21 +231,30 @@ function parse_options_query_string()
 }
 
 
-if (php_sapi_name() != 'cli')
+if (php_sapi_name() != 'cli') {
   $options = parse_options_query_string();
-else
+  $ERROR_STREAM = fopen('php://output', 'w');
+} else {
   $options = parse_options_cli($argv, $argc);
+  $ERROR_STREAM = fopen('php://stderr', 'w');
+}
 
-if (!isset($options['src_url']))
-  die(usage($argv));
+if (!isset($options['src_url'])) {
+  fwrite($ERROR_STREAM, usage($argv));
+  exit(1);
+}
 
 $url = parse_url($options['src_url']);
-if (FALSE === $url || empty($url["host"]))
-  die("Invalid url: ${options['src_url']}\n");
+if (FALSE === $url || empty($url["host"])) {
+  fwrite($ERROR_STREAM, "Invalid url: ${options['src_url']}\n");
+  exit(1);
+}
 
-$stylesheet = __DIR__ . "/rss_converter_" . $url["host"] . ".xsl";
-if (FALSE === file_exists($stylesheet))
-  die("Conversion to RSS not supported: {$url["host"]}\n");
+$stylesheet = "file://" . __DIR__ . "/rss_converter_" . $url["host"] . ".xsl";
+if (FALSE === file_exists($stylesheet)) {
+  fwrite($ERROR_STREAM, "Conversion to RSS not supported: {$url["host"]}\n");
+  exit(1);
+}
 
 $tweeper = new Tweeper($stylesheet, $options['generate_enclosure']);
 echo $tweeper->tweep($options['src_url']);