X-Git-Url: https://git.ao2.it/tweeper.git/blobdiff_plain/7f80e1efb56d6ac3186962cbe658d129b84a33cd..b187bb677361d17a468abf749332d081a194b4bd:/tweeper.php

diff --git a/tweeper.php b/tweeper.php
index 87efd60..ba8b1d7 100644
--- a/tweeper.php
+++ b/tweeper.php
@@ -19,346 +19,13 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-require_once 'Symfony/Component/Serializer/autoload.php';
+require_once 'src/Tweeper.php';
 
-use Symfony\Component\Serializer\Serializer;
-use Symfony\Component\Serializer\Encoder\XmlEncoder;
-use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
+use Tweeper\Tweeper;
 
 date_default_timezone_set('UTC');
 
 /**
- * Scrape supported websites and perform conversion to RSS.
- */
-class Tweeper {
-
-  private static $userAgent = "Mozilla/5.0 (Windows NT 6.1; rv:22.0) Gecko/20130405 Firefox/22.0";
-
-  /**
-   * Constructor sets up {@link $generate_enclosure}.
-   */
-  public function __construct($generate_enclosure = FALSE) {
-    $this->generate_enclosure = $generate_enclosure;
-  }
-
-  /**
-   * Convert numeric Epoch to the date format expected in a RSS document.
-   */
-  public static function epochToRssDate($timestamp) {
-    if (!is_numeric($timestamp) || is_nan($timestamp)) {
-      $timestamp = 0;
-    }
-
-    return gmdate(DATE_RSS, $timestamp);
-  }
-
-  /**
-   * Convert generic date string to the date format expected in a RSS document.
-   */
-  public static function strToRssDate($date) {
-    $timestamp = strtotime($date);
-    if (FALSE === $timestamp) {
-      $timestamp = 0;
-    }
-
-    return Tweeper::epochToRssDate($timestamp);
-  }
-
-  /**
-   * Convert string to UpperCamelCase.
-   */
-  public static function toUpperCamelCase($str, $delim = ' ') {
-    $str_upper = ucwords($str, $delim);
-    $str_camel_case = str_replace($delim, '', $str_upper);
-    return $str_camel_case;
-  }
-
-  /**
-   * Get the contents from a URL.
-   */
-  private static function getUrlContents($url) {
-    $ch = curl_init($url);
-    curl_setopt_array($ch, array(
-      CURLOPT_HEADER => FALSE,
-      // Follow http redirects to get the real URL.
-      CURLOPT_FOLLOWLOCATION => TRUE,
-      CURLOPT_RETURNTRANSFER => TRUE,
-      CURLOPT_SSL_VERIFYHOST => FALSE,
-      CURLOPT_SSL_VERIFYPEER => FALSE,
-      CURLOPT_HTTPHEADER => array('Accept-language: en'),
-      CURLOPT_USERAGENT => Tweeper::$userAgent,
-    ));
-    $contents = curl_exec($ch);
-    if (FALSE === $contents) {
-      trigger_error(curl_error($ch));
-    }
-    curl_close($ch);
-
-    return $contents;
-  }
-
-  /**
-   * Get the headers from a URL.
-   */
-  private static function getUrlInfo($url) {
-    $ch = curl_init($url);
-    curl_setopt_array($ch, array(
-      CURLOPT_HEADER => TRUE,
-      CURLOPT_NOBODY => TRUE,
-      // Follow http redirects to get the real URL.
-      CURLOPT_FOLLOWLOCATION => TRUE,
-      CURLOPT_RETURNTRANSFER => TRUE,
-      CURLOPT_SSL_VERIFYHOST => FALSE,
-      CURLOPT_SSL_VERIFYPEER => FALSE,
-      CURLOPT_USERAGENT => Tweeper::$userAgent,
-    ));
-    curl_exec($ch);
-    $url_info = curl_getinfo($ch);
-    if (FALSE === $url_info) {
-      trigger_error(curl_error($ch));
-    }
-    curl_close($ch);
-
-    return $url_info;
-  }
-
-  /**
-   * Generate an RSS <enclosure/> element.
-   */
-  public static function generateEnclosure($url) {
-    $supported_content_types = array(
-      "application/octet-stream",
-      "application/ogg",
-      "application/pdf",
-      "audio/aac",
-      "audio/mp4",
-      "audio/mpeg",
-      "audio/ogg",
-      "audio/vorbis",
-      "audio/wav",
-      "audio/webm",
-      "audio/x-midi",
-      "image/gif",
-      "image/jpeg",
-      "image/png",
-      "video/avi",
-      "video/mp4",
-      "video/mpeg",
-      "video/ogg",
-    );
-
-    $url_info = Tweeper::getUrlInfo($url);
-
-    $supported = in_array($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 '';
-    }
-
-    // The RSS specification says that the enclosure element URL must be http.
-    // See http://sourceforge.net/p/feedvalidator/bugs/72/
-    $http_url = preg_replace("/^https/", "http", $url_info['url']);
-
-    $dom = new DOMDocument();
-    $enc = $dom->createElement('enclosure');
-    $enc->setAttribute('url', $http_url);
-    $enc->setAttribute('length', $url_info['download_content_length']);
-    $enc->setAttribute('type', $url_info['content_type']);
-
-    return $enc;
-  }
-
-  /**
-   * Mimic the message from libxml.c::php_libxml_ctx_error_level()
-   */
-  private static function logXmlError($error) {
-    $output = "";
-
-    switch ($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);
-  }
-
-  /**
-   * Convert json to XML.
-   */
-  private static function jsonToXml($json, $root_node_name) {
-    // Apparently the ObjectNormalizer used afterwards is not able to handle
-    // the stdClass object created by json_decode() with the default setting
-    // $assoc = false; so use $assoc = true.
-    $data = json_decode($json, $assoc = TRUE);
-    if (!$data) {
-      return NULL;
-    }
-
-    $encoder = new XmlEncoder();
-    $normalizer = new ObjectNormalizer();
-    $serializer = new Serializer(array($normalizer), array($encoder));
-
-    $serializer_options = array(
-      'xml_encoding' => "UTF-8",
-      'xml_format_output' => TRUE,
-      'xml_root_node_name' => $root_node_name,
-    );
-
-    $xml_data = $serializer->serialize($data, 'xml', $serializer_options);
-    if (!$xml_data) {
-      trigger_error("Cannot serialize data", E_USER_ERROR);
-      return NULL;
-    }
-
-    return $xml_data;
-  }
-
-  /**
-   * Convert the Instagram content to XML.
-   */
-  private function getXmlInstagramCom($html) {
-    // Extract the json data from the html code.
-    $json_match_expr = '/window._sharedData = (.*);/';
-    $ret = preg_match($json_match_expr, $html, $matches);
-    if ($ret !== 1) {
-      trigger_error("Cannot match expression: $json_match_expr\n", E_USER_ERROR);
-      return NULL;
-    }
-
-    return Tweeper::jsonToXml($matches[1], 'instagram');
-  }
-
-  /**
-   * Make the Facebook HTML processable.
-   */
-  private function preprocessHtmlFacebookCom($html) {
-    $html = str_replace('<!--', '', $html);
-    $html = str_replace('-->', '', $html);
-    return $html;
-  }
-
-  /**
-   * Convert the HTML retrieved from the site to XML.
-   */
-  private function htmlToXml($html, $host) {
-    $xmlDoc = new DOMDocument();
-
-    // Handle warnings and errors when loading invalid HTML.
-    $xml_errors_value = libxml_use_internal_errors(TRUE);
-
-    // If there is a host-specific method to get the XML data, use it!
-    $get_xml_host_method = 'getXml' . Tweeper::toUpperCamelCase($host, '.');
-    if (method_exists($this, $get_xml_host_method)) {
-      $xml_data = call_user_func_array(array($this, $get_xml_host_method), array($html));
-      $xmlDoc->loadXML($xml_data);
-    }
-    else {
-      $xmlDoc->loadHTML($html);
-    }
-
-    foreach (libxml_get_errors() as $xml_error) {
-      Tweeper::logXmlError($xml_error);
-    }
-    libxml_clear_errors();
-    libxml_use_internal_errors($xml_errors_value);
-
-    return $xmlDoc;
-  }
-
-  /**
-   * Load a stylesheet if the web site is supported.
-   */
-  private function loadStylesheet($host) {
-    $stylesheet = "file://" . __DIR__ . "/rss_converter_" . $host . ".xsl";
-    if (FALSE === file_exists($stylesheet)) {
-      trigger_error("Conversion to RSS not supported for $host ($stylesheet not found)", E_USER_ERROR);
-      return NULL;
-    }
-
-    $stylesheet_contents = Tweeper::getUrlContents($stylesheet);
-
-    $xslDoc = new DOMDocument();
-    $xslDoc->loadXML($stylesheet_contents);
-
-    $xsltProcessor = new XSLTProcessor();
-    $xsltProcessor->registerPHPFunctions();
-    $xsltProcessor->setParameter('', 'generate-enclosure', $this->generate_enclosure);
-    $xsltProcessor->importStylesheet($xslDoc);
-
-    return $xsltProcessor;
-  }
-
-  /**
-   * Convert the site content to RSS.
-   */
-  public function tweep($src_url) {
-    $url = parse_url($src_url);
-    if (FALSE === $url || empty($url["host"])) {
-      trigger_error("Invalid URL: $src_url", E_USER_ERROR);
-      return NULL;
-    }
-
-    $scheme = $url["scheme"];
-    if (!in_array($scheme, array("http", "https"))) {
-      trigger_error("unsupported scheme: $scheme", E_USER_ERROR);
-      return NULL;
-    }
-
-    // Strip the leading www. to be more forgiving on input URLs.
-    $host = preg_replace('/^www\./', '', $url["host"]);
-
-    $xsltProcessor = $this->loadStylesheet($host);
-    if (NULL === $xsltProcessor) {
-      return NULL;
-    }
-
-    $html = Tweeper::getUrlContents($src_url);
-    if (FALSE === $html) {
-      return NULL;
-    }
-
-    $preprocess_html_host_method = 'preprocessHtml' . Tweeper::toUpperCamelCase($host, '.');
-    if (method_exists($this, $preprocess_html_host_method)) {
-      $html = call_user_func_array(array($this, $preprocess_html_host_method), array($html));
-    }
-
-    $xmlDoc = $this->htmlToXml($html, $host);
-    if (NULL === $xmlDoc) {
-      return NULL;
-    }
-
-    $output = $xsltProcessor->transformToXML($xmlDoc);
-
-    if (FALSE === $output) {
-      trigger_error('XSL transformation failed.', E_USER_ERROR);
-      return NULL;
-    }
-    return $output;
-  }
-
-}
-
-/**
  * Check if the script is being run from the command line.
  */
 function is_cli() {