src/Tweeper.php: check http response code and return error for error codes

[tweeper.git] / src / Tweeper.php

diff --git a/src/Tweeper.php b/src/Tweeper.php
index e98623b..12004cf 100644 (file)
--- a/src/Tweeper.php
+++ b/src/Tweeper.php
@@ -6,7 +6,7 @@ namespace Tweeper;
  * @file
  * Tweeper - a Twitter to RSS web scraper.
  *
- * Copyright (C) 2013-2018  Antonio Ospite <ao2@ao2.it>
+ * Copyright (C) 2013-2020  Antonio Ospite <ao2@ao2.it>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -36,7 +36,7 @@ date_default_timezone_set('UTC');
  */
 class Tweeper {
 
-  private static $userAgent = "Mozilla/5.0";
+  private static $userAgent = "APIs-Google (+https://developers.google.com/webmasters/APIs-Google.html)";
   private static $maxConnectionTimeout = 5;
   private static $maxConnectionRetries = 5;
 
@@ -111,24 +111,35 @@ class Tweeper {
       }
     } while (curl_errno($ch) == CURLE_OPERATION_TIMEDOUT && ++$attempt < Tweeper::$maxConnectionRetries);
 
+    $response_code = curl_getinfo($ch, CURLINFO_RESPONSE_CODE);
+    if (FALSE === $response_code) {
+      trigger_error(curl_error($ch), E_USER_WARNING);
+      return FALSE;
+    }
+
+    if ($response_code >= 400) {
+      trigger_error("HTTP reponse code $response_code", E_USER_WARNING);
+      return FALSE;
+    }
+
     return $ret;
   }
 
   /**
    * Get the contents from a URL.
    */
-  private static function getUrlContents($url) {
+  private static function getUrlContents($url, $user_agent = NULL) {
     $ch = curl_init($url);
-    curl_setopt_array($ch, array(
+    curl_setopt_array($ch, [
       CURLOPT_HEADER => FALSE,
       CURLOPT_CONNECTTIMEOUT => Tweeper::$maxConnectionTimeout,
       // Follow http redirects to get the real URL.
       CURLOPT_FOLLOWLOCATION => TRUE,
       CURLOPT_COOKIEFILE => "",
       CURLOPT_RETURNTRANSFER => TRUE,
-      CURLOPT_HTTPHEADER => array('Accept-language: en'),
-      CURLOPT_USERAGENT => Tweeper::$userAgent,
-    ));
+      CURLOPT_HTTPHEADER => ['Accept-language: en'],
+      CURLOPT_USERAGENT => isset($user_agent) ? $user_agent : Tweeper::$userAgent,
+    ]);
     $contents = Tweeper::curlExec($ch);
     curl_close($ch);
 
@@ -138,17 +149,17 @@ class Tweeper {
   /**
    * Get the headers from a URL.
    */
-  private static function getUrlInfo($url) {
+  private static function getUrlInfo($url, $user_agent = NULL) {
     $ch = curl_init($url);
-    curl_setopt_array($ch, array(
+    curl_setopt_array($ch, [
       CURLOPT_HEADER => TRUE,
       CURLOPT_NOBODY => TRUE,
       CURLOPT_CONNECTTIMEOUT => Tweeper::$maxConnectionTimeout,
       // Follow http redirects to get the real URL.
       CURLOPT_FOLLOWLOCATION => TRUE,
       CURLOPT_RETURNTRANSFER => TRUE,
-      CURLOPT_USERAGENT => Tweeper::$userAgent,
-    ));
+      CURLOPT_USERAGENT => isset($user_agent) ? $user_agent : Tweeper::$userAgent,
+    ]);
 
     $ret = Tweeper::curlExec($ch);
     if (FALSE === $ret) {
@@ -169,7 +180,7 @@ class Tweeper {
    * Generate an RSS <enclosure/> element.
    */
   public static function generateEnclosure($url) {
-    $supported_content_types = array(
+    $supported_content_types = [
       "application/octet-stream",
       "application/ogg",
       "application/pdf",
@@ -188,7 +199,7 @@ class Tweeper {
       "video/mp4",
       "video/mpeg",
       "video/ogg",
-    );
+    ];
 
     $url_info = Tweeper::getUrlInfo($url);
     if (FALSE === $url_info) {
@@ -270,13 +281,13 @@ class Tweeper {
 
     $encoder = new XmlEncoder();
     $normalizer = new ObjectNormalizer();
-    $serializer = new Serializer(array($normalizer), array($encoder));
+    $serializer = new Serializer([$normalizer], [$encoder]);
 
-    $serializer_options = array(
+    $serializer_options = [
       '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) {
@@ -335,7 +346,10 @@ class Tweeper {
     // 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));
+      $xml_data = call_user_func_array([$this, $get_xml_host_method], [$html]);
+      if (NULL === $xml_data) {
+        return NULL;
+      }
       $xmlDoc->loadXML($xml_data);
     }
     else {
@@ -363,7 +377,7 @@ class Tweeper {
       return NULL;
     }
 
-    $stylesheet_contents = Tweeper::getUrlContents($stylesheet);
+    $stylesheet_contents = file_get_contents($stylesheet);
     if (FALSE === $stylesheet_contents) {
       trigger_error("Cannot open $stylesheet", E_USER_WARNING);
       return NULL;
@@ -394,7 +408,7 @@ class Tweeper {
 
     if (TRUE === $validate_scheme) {
       $scheme = $url["scheme"];
-      if (!in_array($scheme, array("http", "https"))) {
+      if (!in_array($scheme, ["http", "https"])) {
         trigger_error("unsupported scheme: $scheme", E_USER_WARNING);
         return NULL;
       }
@@ -423,7 +437,7 @@ class Tweeper {
 
     $preprocess_html_host_method = 'preprocessHtml' . Tweeper::toUpperCamelCase($host, '.');
     if (method_exists($this, $preprocess_html_host_method)) {
-      $html = call_user_func_array(array($this, $preprocess_html_host_method), array($html));
+      $html = call_user_func_array([$this, $preprocess_html_host_method], [$html]);
     }
 
     $xmlDoc = $this->htmlToXml($html, $host);