plugins/af_zz_imgproxy/init.php

   1 <?php
   2 class Af_Zz_ImgProxy extends Plugin {
   3         private $host;
   4
   5         function about() {
   6                 return array(1.0,
   7                         "Load insecure images via built-in proxy",
   8                         "fox");
   9         }
  10
  11         function is_public_method($method) {
  12                 return $method === "imgproxy";
  13         }
  14
  15         function init($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                 $host->add_hook($host::HOOK_PREFS_TAB, $this);
  23         }
  24
  25         function hook_render_article($article) {
  26                 return $this->hook_render_article_cdm($article);
  27         }
  28
  29         function hook_render_article_api($headline) {
  30                 return $this->hook_render_article_cdm($headline["headline"], true);
  31         }
  32
  33         public function imgproxy() {
  34
  35                 $url = rewrite_relative_url(SELF_URL_PATH, $_REQUEST["url"]);
  36                 $kind = (int) $_REQUEST["kind"]; // 1 = video
  37
  38                 // called without user context, let's just redirect to original URL
  39                 if (!$_SESSION["uid"]) {
  40                         header("Location: $url");
  41                         return;
  42                 }
  43
  44                 $extension = $kind == 1 ? '.mp4' : '.png';
  45                 $local_filename = CACHE_DIR . "/images/" . sha1($url) . $extension;
  46
  47                 if ($_REQUEST["debug"] == "1") { print $url . "\n" . $local_filename; die; }
  48
  49                 header("Content-Disposition: inline; filename=\"".basename($local_filename)."\"");
  50
  51                 if (file_exists($local_filename)) {
  52                         $mimetype = mime_content_type($local_filename);
  53                         header("Content-type: $mimetype");
  54
  55                         $stamp = gmdate("D, d M Y H:i:s", filemtime($local_filename)). " GMT";
  56                         header("Last-Modified: $stamp", true);
  57
  58                         readfile($local_filename);
  59                 } else {
  60                         $data = fetch_file_contents(array("url" => $url));
  61
  62                         if ($data) {
  63                                 if (file_put_contents($local_filename, $data)) {
  64                                         $mimetype = mime_content_type($local_filename);
  65                                         header("Content-type: $mimetype");
  66                                 }
  67
  68                                 print $data;
  69                         }
  70                 }
  71         }
  72
  73         function rewrite_url_if_needed($url, $kind, $all_remote = false) {
  74                 $scheme = parse_url($url, PHP_URL_SCHEME);
  75
  76                 if ($all_remote) {
  77                         $host = parse_url($url, PHP_URL_HOST);
  78                         $self_host = parse_url(SELF_URL_PATH, PHP_URL_HOST);
  79
  80                         $is_remote = $host != $self_host;
  81                 } else {
  82                         $is_remote = false;
  83                 }
  84
  85                 if (($scheme != 'https' && $scheme != "") || $is_remote) {
  86                         if (strpos($url, "data:") !== 0) {
  87                                 $url = "public.php?op=pluginhandler&plugin=af_zz_imgproxy&pmethod=imgproxy&kind=$kind&url=" .
  88                                         urlencode($url);
  89                         }
  90                 }
  91
  92                 return $url;
  93         }
  94
  95         function hook_render_article_cdm($article, $api_mode = false) {
  96
  97                 $need_saving = false;
  98                 $proxy_all = $this->host->get($this, "proxy_all");
  99
 100                 $doc = new DOMDocument();
 101                 if (@$doc->loadHTML($article["content"])) {
 102                         $xpath = new DOMXPath($doc);
 103                         $imgs = $xpath->query("//img[@src]");
 104
 105                         foreach ($imgs as $img) {
 106                                 $new_src = $this->rewrite_url_if_needed($img->getAttribute("src"), 0, $proxy_all);
 107
 108                                 if ($new_src != $img->getAttribute("src")) {
 109                                         $img->setAttribute("src", $new_src);
 110
 111                                         $need_saving = true;
 112                                 }
 113                         }
 114
 115                         $vids = $xpath->query("//video");
 116
 117                         foreach ($vids as $vid) {
 118                                 if ($vid->hasAttribute("poster")) {
 119                                         $new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"), 0, $proxy_all);
 120
 121                                         if ($new_src != $vid->getAttribute("poster")) {
 122                                                 $vid->setAttribute("poster", $new_src);
 123
 124                                                 $need_saving = true;
 125                                         }
 126                                 }
 127
 128                                 $vsrcs = $xpath->query("source", $vid);
 129
 130                                 foreach ($vsrcs as $vsrc) {
 131                                         $new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), 1, $proxy_all);
 132
 133                                         if ($new_src != $vsrc->getAttribute("src")) {
 134                                                 $vid->setAttribute("src", $new_src);
 135
 136                                                 $need_saving = true;
 137                                         }
 138                                 }
 139                         }
 140                 }
 141
 142                 if ($need_saving) $article["content"] = $doc->saveXML();
 143
 144                 return $article;
 145         }
 146
 147         function hook_prefs_tab($args) {
 148                 if ($args != "prefFeeds") return;
 149
 150                 print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Image proxy settings (af_zz_imgproxy)')."\">";
 151
 152                 print "<form dojoType=\"dijit.form.Form\">";
 153
 154                 print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
 155                         evt.preventDefault();
 156                         if (this.validate()) {
 157                                 console.log(dojo.objectToQuery(this.getValues()));
 158                                 new Ajax.Request('backend.php', {
 159                                         parameters: dojo.objectToQuery(this.getValues()),
 160                                         onComplete: function(transport) {
 161                                                 notify_info(transport.responseText);
 162                                         }
 163                                 });
 164                                 //this.reset();
 165                         }
 166                         </script>";
 167
 168                 print_hidden("op", "pluginhandler");
 169                 print_hidden("method", "save");
 170                 print_hidden("plugin", "af_zz_imgproxy");
 171
 172                 $proxy_all = $this->host->get($this, "proxy_all");
 173                 print_checkbox("proxy_all", $proxy_all);
 174
 175                 print "&nbsp;<label for=\"proxy_all\">" . __("Enable proxy for all remote images.") . "</label>";
 176
 177                 print "<p>"; print_button("submit", __("Save"));
 178
 179                 print "</form>";
 180
 181                 print "</div>";
 182         }
 183
 184         function save() {
 185                 $proxy_all = checkbox_to_sql_bool($_POST["proxy_all"]) == "true";
 186
 187                 $this->host->set($this, "proxy_all", $proxy_all);
 188
 189                 echo __("Configuration saved");
 190         }
 191
 192         function api_version() {
 193                 return 2;
 194         }
 195 }