Add support for converting Instagram user timelines to RSS

[tweeper.git] / tweeper.php

diff --git a/tweeper.php b/tweeper.php
index 524928a..ed1e1c7 100644 (file)
--- a/tweeper.php
+++ b/tweeper.php
@@ -18,6 +18,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+require_once 'XML/Serializer.php';
+
 date_default_timezone_set('UTC');
 
 class Tweeper {
@@ -96,7 +98,11 @@ class Tweeper {
       "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) {
@@ -164,12 +170,56 @@ class Tweeper {
     return $xsltProcessor;
   }
 
-  private function html_to_xml($html) {
+  private function json_to_xml($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;
+    }
+
+    $data = json_decode($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 $serializer->getSerializedData();
+  }
+
+  private function get_xml_instagram_com($html) {
+    return $this->json_to_xml($html, '/window._sharedData = (.*);/', 'instagram');
+  }
+
+  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);
-    $xmlDoc->loadHTML($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);
     }
@@ -196,7 +246,7 @@ class Tweeper {
       return NULL;
     }
 
-    $xmlDoc = $this->html_to_xml($html);
+    $xmlDoc = $this->html_to_xml($html, $url["host"]);
     if (NULL === $xmlDoc) {
       return NULL;
     }