tweeper.php: add infrastructure for sites using json data

[tweeper.git] / tweeper.php

diff --git a/tweeper.php b/tweeper.php
index 17fff8b..9f09936 100644 (file)
--- a/tweeper.php
+++ b/tweeper.php
@@ -18,6 +18,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 

+require_once 'XML/Serializer.php';
+

 date_default_timezone_set('UTC');
 
 class Tweeper {
 date_default_timezone_set('UTC');
 
 class Tweeper {


@@ -96,7 +98,11 @@ class Tweeper {
       "video/ogg",
     );
 
       "video/ogg",
     );
 

-    $url_info = Tweeper::get_info($url);
+    // 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);
+
+    $url_info = Tweeper::get_info($http_url);

 
     $supported = in_array($url_info['content_type'], $supported_content_types);
     if (!$supported) {
 
     $supported = in_array($url_info['content_type'], $supported_content_types);
     if (!$supported) {


@@ -164,31 +170,83 @@ class Tweeper {
     return $xsltProcessor;
   }
 
     return $xsltProcessor;
   }
 

-  public function tweep($src_url) {
-    $url = parse_url($src_url);
-    if (FALSE === $url || empty($url["host"])) {
-      trigger_error("Invalid url: $src_url", E_USER_ERROR);
+  private function json_to_xml($html, $json_match_expr, $rootName) {
+    // pre-process, convert json to XML
+    $ret = preg_match($json_match_expr, $html, $matches);
+    if ($ret !== 1) {
+      trigger_error("Cannot match expression: $json_match_expr\n", E_USER_ERROR);

       return NULL;
     }
 
       return NULL;
     }
 

-    $xsltProcessor = $this->load_stylesheet($url["host"]);
-    if (NULL === $xsltProcessor) {
+    $data = json_decode($matches[1]);
+    if (!$data) {
+      return NULL;
+    }
+
+    $serializer_options = array (
+      'addDecl' => TRUE,
+      'encoding' => "UTF-8",
+      'indent' => '  ',
+      'rootName' => $rootName,
+    );
+
+    $serializer = new XML_Serializer($serializer_options);
+
+    $status = $serializer->serialize($data);
+    if (PEAR::isError($status)) {
+      trigger_error($status->getMessage(), E_USER_ERROR);

       return NULL;
     }
 
       return NULL;
     }
 

-    $html = Tweeper::get_contents($src_url);
+    return $serializer->getSerializedData();
+  }

 
 

+  private function html_to_xml($html, $host) {

     $xmlDoc = new DOMDocument();
 
     // Handle warnings and errors when loading invalid HTML.
     $xml_errors_value = libxml_use_internal_errors(true);
     $xmlDoc = new DOMDocument();
 
     // Handle warnings and errors when loading invalid HTML.
     $xml_errors_value = libxml_use_internal_errors(true);

-    $xmlDoc->loadHTML($html);
+
+    // If there is a host-specific method to get the xml data, use it!
+    $get_xml_host_method = 'get_xml_' . str_replace(".", "_", $host);
+    if (method_exists($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) {
       $this->log_xml_error($xml_error);
     }
     libxml_clear_errors();
     libxml_use_internal_errors($xml_errors_value);
 
     foreach (libxml_get_errors() as $xml_error) {
       $this->log_xml_error($xml_error);
     }
     libxml_clear_errors();
     libxml_use_internal_errors($xml_errors_value);
 

+    return $xmlDoc;
+  }
+
+  public function tweep($src_url) {
+    $url = parse_url($src_url);
+    if (FALSE === $url || empty($url["host"])) {
+      trigger_error("Invalid url: $src_url", E_USER_ERROR);
+      return NULL;
+    }
+
+    $xsltProcessor = $this->load_stylesheet($url["host"]);
+    if (NULL === $xsltProcessor) {
+      return NULL;
+    }
+
+    $html = $this->get_contents($src_url);
+    if (FALSE === $html) {
+      return NULL;
+    }
+
+    $xmlDoc = $this->html_to_xml($html, $url["host"]);
+    if (NULL === $xmlDoc) {
+      return NULL;
+    }
+

     $output = $xsltProcessor->transformToXML($xmlDoc);
 
     if (FALSE === $output) {
     $output = $xsltProcessor->transformToXML($xmlDoc);
 
     if (FALSE === $output) {