plugins/af_zz_imgproxy/init.php

   1 <?php
   2 class Af_Zz_ImgProxy extends Plugin {
   3
   4         /* @var PluginHost $host */
   5         private $host;
   6
   7         function about() {
   8                 return array(1.0,
   9                         "Load insecure images via built-in proxy",
  10                         "fox");
  11         }
  12
  13         private $ssl_known_whitelist = "imgur.com gfycat.com i.reddituploads.com pbs.twimg.com i.redd.it i.sli.mg media.tumblr.com";
  14
  15         function is_public_method($method) {
  16                 return $method === "imgproxy";
  17         }
  18
  19         function init($host) {
  20                 $this->host = $host;
  21
  22                 $host->add_hook($host::HOOK_RENDER_ARTICLE, $this);
  23                 $host->add_hook($host::HOOK_RENDER_ARTICLE_CDM, $this);
  24                 $host->add_hook($host::HOOK_ENCLOSURE_ENTRY, $this);
  25
  26                 $host->add_hook($host::HOOK_PREFS_TAB, $this);
  27         }
  28
  29         function hook_enclosure_entry($enc) {
  30                 if (preg_match("/image/", $enc["content_type"])) {
  31                         $proxy_all = $this->host->get($this, "proxy_all");
  32
  33                         $enc["content_url"] = $this->rewrite_url_if_needed($enc["content_url"], $proxy_all);
  34                 }
  35
  36                 return $enc;
  37         }
  38
  39         function hook_render_article($article) {
  40                 return $this->hook_render_article_cdm($article);
  41         }
  42
  43         public function imgproxy() {
  44
  45                 $url = rewrite_relative_url(get_self_url_prefix(), $_REQUEST["url"]);
  46
  47                 // called without user context, let's just redirect to original URL
  48                 if (!$_SESSION["uid"]) {
  49                         header("Location: $url");
  50                         return;
  51                 }
  52
  53                 $local_filename = CACHE_DIR . "/images/" . sha1($url);
  54
  55                 if ($_REQUEST["debug"] == "1") { print $url . "\n" . $local_filename; die; }
  56
  57                 header("Content-Disposition: inline; filename=\"".basename($local_filename)."\"");
  58
  59                 if (file_exists($local_filename)) {
  60
  61                         send_local_file($local_filename);
  62
  63                 } else {
  64                         $data = fetch_file_contents(array("url" => $url));
  65
  66                         if ($data) {
  67
  68                                 $disable_cache = $this->host->get($this, "disable_cache");
  69
  70                                 if (!$disable_cache && strlen($data) > MIN_CACHE_FILE_SIZE) {
  71                                         if (file_put_contents($local_filename, $data)) {
  72                                                 $mimetype = mime_content_type($local_filename);
  73                                                 header("Content-type: $mimetype");
  74                                         }
  75                                 }
  76
  77                                 print $data;
  78                         } else {
  79                                 global $fetch_last_error;
  80                                 global $fetch_last_error_code;
  81                                 global $fetch_last_error_content;
  82
  83                                 if (function_exists("imagecreate") && !isset($_REQUEST["text"])) {
  84                                         $img = imagecreate(450, 75);
  85
  86                                         /*$bg =*/ imagecolorallocate($img, 255, 255, 255);
  87                                         $textcolor = imagecolorallocate($img, 255, 0, 0);
  88
  89                                         imagerectangle($img, 0, 0, 450-1, 75-1, $textcolor);
  90
  91                                         imagestring($img, 5, 5, 5, "Proxy request failed", $textcolor);
  92                                         imagestring($img, 5, 5, 30, truncate_middle($url, 46, "..."), $textcolor);
  93                                         imagestring($img, 5, 5, 55, "HTTP Code: $fetch_last_error_code", $textcolor);
  94
  95                                         header("Content-type: image/png");
  96                                         print imagepng($img);
  97                                         imagedestroy($img);
  98
  99                                 } else {
 100                                         header("Content-type: text/html");
 101
 102                                         http_response_code(400);
 103
 104                                         print "<h1>Proxy request failed.</h1>";
 105                                         print "<p>Fetch error $fetch_last_error ($fetch_last_error_code)</p>";
 106                                         print "<p>URL: $url</p>";
 107                                         print "<textarea cols='80' rows='25'>" . htmlspecialchars($fetch_last_error_content) . "</textarea>";
 108                                 }
 109                         }
 110                 }
 111         }
 112
 113         function rewrite_url_if_needed($url, $all_remote = false) {
 114                 $scheme = parse_url($url, PHP_URL_SCHEME);
 115
 116                 if ($all_remote) {
 117                         $host = parse_url($url, PHP_URL_HOST);
 118                         $self_host = parse_url(get_self_url_prefix(), PHP_URL_HOST);
 119
 120                         $is_remote = $host != $self_host;
 121                 } else {
 122                         $is_remote = false;
 123                 }
 124
 125                 if (($scheme != 'https' && $scheme != "") || $is_remote) {
 126                         if (strpos($url, "data:") !== 0) {
 127                                 $parts = parse_url($url);
 128
 129                                 foreach (explode(" " , $this->ssl_known_whitelist) as $host) {
 130                                         if (substr(strtolower($parts['host']), -strlen($host)) === strtolower($host)) {
 131                                                 $parts['scheme'] = 'https';
 132                                                 $url = build_url($parts);
 133                                                 if ($all_remote && $is_remote) {
 134                                                         break;
 135                                                 } else {
 136                                                         return $url;
 137                                                 }
 138                                         }
 139                                 }
 140
 141                                 return get_self_url_prefix() . "/public.php?op=pluginhandler&plugin=af_zz_imgproxy&pmethod=imgproxy&url=" .
 142                                         urlencode($url);
 143                         }
 144                 }
 145
 146                 return $url;
 147         }
 148
 149         /**
 150          * @SuppressWarnings(PHPMD.UnusedFormalParameter)
 151          */
 152         function hook_render_article_cdm($article, $api_mode = false) {
 153
 154                 $need_saving = false;
 155                 $proxy_all = $this->host->get($this, "proxy_all");
 156
 157                 $doc = new DOMDocument();
 158                 if (@$doc->loadHTML($article["content"])) {
 159                         $xpath = new DOMXPath($doc);
 160                         $imgs = $xpath->query("//img[@src]");
 161
 162                         foreach ($imgs as $img) {
 163                                 $new_src = $this->rewrite_url_if_needed($img->getAttribute("src"), $proxy_all);
 164
 165                                 if ($new_src != $img->getAttribute("src")) {
 166                                         $img->setAttribute("src", $new_src);
 167                                         $img->removeAttribute("srcset");
 168
 169                                         $need_saving = true;
 170                                 }
 171                         }
 172
 173                         $vids = $xpath->query("//video");
 174
 175                         foreach ($vids as $vid) {
 176                                 if ($vid->hasAttribute("poster")) {
 177                                         $new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"), $proxy_all);
 178
 179                                         if ($new_src != $vid->getAttribute("poster")) {
 180                                                 $vid->setAttribute("poster", $new_src);
 181
 182                                                 $need_saving = true;
 183                                         }
 184                                 }
 185
 186                                 $vsrcs = $xpath->query("source", $vid);
 187
 188                                 foreach ($vsrcs as $vsrc) {
 189                                         $new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), $proxy_all);
 190
 191                                         if ($new_src != $vsrc->getAttribute("src")) {
 192                                                 $vid->setAttribute("src", $new_src);
 193
 194                                                 $need_saving = true;
 195                                         }
 196                                 }
 197                         }
 198                 }
 199
 200                 if ($need_saving) $article["content"] = $doc->saveHTML();
 201
 202                 return $article;
 203         }
 204
 205         function hook_prefs_tab($args) {
 206                 if ($args != "prefFeeds") return;
 207
 208                 print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Image proxy settings (af_zz_imgproxy)')."\">";
 209
 210                 print "<form dojoType=\"dijit.form.Form\">";
 211
 212                 print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
 213                         evt.preventDefault();
 214                         if (this.validate()) {
 215                                 console.log(dojo.objectToQuery(this.getValues()));
 216                                 new Ajax.Request('backend.php', {
 217                                         parameters: dojo.objectToQuery(this.getValues()),
 218                                         onComplete: function(transport) {
 219                                                 notify_info(transport.responseText);
 220                                         }
 221                                 });
 222                                 //this.reset();
 223                         }
 224                         </script>";
 225
 226                 print_hidden("op", "pluginhandler");
 227                 print_hidden("method", "save");
 228                 print_hidden("plugin", "af_zz_imgproxy");
 229
 230                 $proxy_all = $this->host->get($this, "proxy_all");
 231                 print_checkbox("proxy_all", $proxy_all);
 232                 print "&nbsp;<label for=\"proxy_all\">" . __("Enable proxy for all remote images.") . "</label><br/>";
 233
 234                 $disable_cache = $this->host->get($this, "disable_cache");
 235                 print_checkbox("disable_cache", $disable_cache);
 236                 print "&nbsp;<label for=\"disable_cache\">" . __("Don't cache files locally.") . "</label>";
 237
 238                 print "<p>"; print_button("submit", __("Save"));
 239
 240                 print "</form>";
 241
 242                 print "</div>";
 243         }
 244
 245         function save() {
 246                 $proxy_all = checkbox_to_sql_bool($_POST["proxy_all"]);
 247                 $disable_cache = checkbox_to_sql_bool($_POST["disable_cache"]);
 248
 249                 $this->host->set($this, "proxy_all", $proxy_all, false);
 250                 $this->host->set($this, "disable_cache", $disable_cache);
 251
 252                 echo __("Configuration saved");
 253         }
 254
 255         function api_version() {
 256                 return 2;
 257         }
 258 }