plugins/af_zz_imgproxy/init.php

   1 <?php
   2 class Af_Zz_ImgProxy extends Plugin {
   3         private $host;
   4
   5         function about() {
   6                 return array(1.0,
   7                         "Load insecure images via built-in proxy",
   8                         "fox");
   9         }
  10
  11         function flags() {
  12                 return array("needs_curl" => true);
  13         }
  14
  15         function init($host) {
  16                 $this->host = $host;
  17
  18                 $host->add_hook($host::HOOK_RENDER_ARTICLE, $this);
  19                 $host->add_hook($host::HOOK_RENDER_ARTICLE_CDM, $this);
  20                 $host->add_hook($host::HOOK_RENDER_ARTICLE_API, $this);
  21         }
  22
  23         function hook_render_article($article) {
  24                 return $this->hook_render_article_cdm($article);
  25         }
  26
  27         function hook_render_article_api($headline) {
  28                 return $this->hook_render_article_cdm($headline["headline"], true);
  29         }
  30
  31         public function imgproxy() {
  32                 $url = rewrite_relative_url(SELF_URL_PATH, $_REQUEST["url"]);
  33                 $kind = (int) $_REQUEST["kind"]; // 1 = video
  34
  35                 $extension = $kind == 1 ? '.mp4' : '.png';
  36                 $local_filename = CACHE_DIR . "/images/" . sha1($url) . $extension;
  37
  38                 if ($_REQUEST["debug"] == "1") { print $local_filename; die; }
  39
  40                 header("Content-Disposition: attachment; filename=\"".basename($local_filename)."\"");
  41
  42                 if (file_exists($local_filename)) {
  43                         readfile($local_filename);
  44                 } else {
  45                         $data = fetch_file_contents(array("url" => $url));
  46                         if ($data) {
  47                                 file_put_contents($local_filename, $data);
  48                                 print $data;
  49                         }
  50                 }
  51         }
  52
  53         function rewrite_url_if_needed($url, $kind = 0) {
  54                 $scheme = parse_url($url, PHP_URL_SCHEME);
  55
  56                 if ($scheme != 'https' && $scheme != "" && strpos($url, "data:") !== 0) {
  57                         $url = "backend.php?op=pluginhandler&plugin=af_zz_imgproxy&method=imgproxy&kind=$kind&url=" .
  58                                 htmlspecialchars($url);
  59                 }
  60
  61                 return $url;
  62         }
  63
  64         function hook_render_article_cdm($article, $api_mode = false) {
  65
  66                 $need_saving = false;
  67
  68                 $doc = new DOMDocument();
  69                 if (@$doc->loadHTML($article["content"])) {
  70                         $xpath = new DOMXPath($doc);
  71                         $imgs = $xpath->query("//img[@src]");
  72
  73                         foreach ($imgs as $img) {
  74                                 $new_src = $this->rewrite_url_if_needed($img->getAttribute("src"));
  75
  76                                 if ($new_src != $img->getAttribute("src")) {
  77                                         $img->setAttribute("src", $new_src);
  78
  79                                         $need_saving = true;
  80                                 }
  81                         }
  82
  83                         $vids = $xpath->query("//video");
  84
  85                         foreach ($vids as $vid) {
  86                                 if ($vid->hasAttribute("poster")) {
  87                                         $new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"));
  88
  89                                         if ($new_src != $vid->getAttribute("poster")) {
  90                                                 $vid->setAttribute("poster", $new_src);
  91
  92                                                 $need_saving = true;
  93                                         }
  94                                 }
  95
  96                                 $vsrcs = $xpath->query("source", $vid);
  97
  98                                 foreach ($vsrcs as $vsrc) {
  99                                         $new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), 1);
 100
 101                                         if ($new_src != $vsrc->getAttribute("src")) {
 102                                                 $vid->setAttribute("src", $new_src);
 103
 104                                                 $need_saving = true;
 105                                         }
 106                                 }
 107                         }
 108                 }
 109
 110                 if ($need_saving) $article["content"] = $doc->saveXML();
 111
 112                 return $article;
 113         }
 114
 115         function api_version() {
 116                 return 2;
 117         }
 118 }