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_ENCLOSURE_ENTRY, $this);
  21
  22                 $host->add_hook($host::HOOK_PREFS_TAB, $this);
  23         }
  24
  25         function hook_enclosure_entry($enc) {
  26                 if (preg_match("/image/", $enc["content_type"])) {
  27                         $proxy_all = $this->host->get($this, "proxy_all");
  28
  29                         $enc["content_url"] = $this->rewrite_url_if_needed($enc["content_url"], $proxy_all);
  30                 }
  31
  32                 return $enc;
  33         }
  34
  35         function hook_render_article($article) {
  36                 return $this->hook_render_article_cdm($article);
  37         }
  38
  39         public function imgproxy() {
  40
  41                 $url = rewrite_relative_url(SELF_URL_PATH, $_REQUEST["url"]);
  42
  43                 // called without user context, let's just redirect to original URL
  44                 if (!$_SESSION["uid"]) {
  45                         header("Location: $url");
  46                         return;
  47                 }
  48
  49                 $local_filename = CACHE_DIR . "/images/" . sha1($url);
  50
  51                 if ($_REQUEST["debug"] == "1") { print $url . "\n" . $local_filename; die; }
  52
  53                 header("Content-Disposition: inline; filename=\"".basename($local_filename)."\"");
  54
  55                 if (file_exists($local_filename)) {
  56                         $mimetype = mime_content_type($local_filename);
  57                         header("Content-type: $mimetype");
  58
  59                         $stamp = gmdate("D, d M Y H:i:s", filemtime($local_filename)). " GMT";
  60                         header("Last-Modified: $stamp", true);
  61
  62                         readfile($local_filename);
  63                 } else {
  64                         $data = fetch_file_contents(array("url" => $url));
  65
  66                         if ($data) {
  67                                 if (file_put_contents($local_filename, $data)) {
  68                                         $mimetype = mime_content_type($local_filename);
  69                                         header("Content-type: $mimetype");
  70                                 }
  71
  72                                 print $data;
  73                         } else {
  74                                 global $fetch_last_error;
  75                                 global $fetch_last_error_code;
  76                                 global $fetch_last_error_content;
  77
  78                                 if (function_exists("imagecreate") && !isset($_REQUEST["text"])) {
  79                                         $img = imagecreate(450, 75);
  80
  81                                         $bg = imagecolorallocate($img, 255, 255, 255);
  82                                         $textcolor = imagecolorallocate($img, 255, 0, 0);
  83
  84                                         imagerectangle($img, 0, 0, 450-1, 75-1, $textcolor);
  85
  86                                         imagestring($img, 5, 5, 5, "Proxy request failed", $textcolor);
  87                                         imagestring($img, 5, 5, 30, truncate_middle($url, 46, "..."), $textcolor);
  88                                         imagestring($img, 5, 5, 55, "HTTP Code: $fetch_last_error_code", $textcolor);
  89
  90                                         header("Content-type: image/png");
  91                                         print imagepng($img);
  92                                         imagedestroy($img);
  93
  94                                 } else {
  95                                         header("Content-type: text/html");
  96
  97                                         http_response_code(400);
  98
  99                                         print "<h1>Proxy request failed.</h1>";
 100                                         print "<p>Fetch error $fetch_last_error ($fetch_last_error_code)</p>";
 101                                         print "<p>URL: $url</p>";
 102                                         print "<textarea cols='80' rows='25'>" . htmlspecialchars($fetch_last_error_content) . "</textarea>";
 103                                 }
 104                         }
 105                 }
 106         }
 107
 108         function rewrite_url_if_needed($url, $all_remote = false) {
 109                 $scheme = parse_url($url, PHP_URL_SCHEME);
 110
 111                 if ($all_remote) {
 112                         $host = parse_url($url, PHP_URL_HOST);
 113                         $self_host = parse_url(SELF_URL_PATH, PHP_URL_HOST);
 114
 115                         $is_remote = $host != $self_host;
 116                 } else {
 117                         $is_remote = false;
 118                 }
 119
 120                 if (($scheme != 'https' && $scheme != "") || $is_remote) {
 121                         if (strpos($url, "data:") !== 0) {
 122                                 $url = get_self_url_prefix() . "/public.php?op=pluginhandler&plugin=af_zz_imgproxy&pmethod=imgproxy&url=" .
 123                                         urlencode($url);
 124                         }
 125                 }
 126
 127                 return $url;
 128         }
 129
 130         function hook_render_article_cdm($article, $api_mode = false) {
 131
 132                 $need_saving = false;
 133                 $proxy_all = $this->host->get($this, "proxy_all");
 134
 135                 $doc = new DOMDocument();
 136                 if (@$doc->loadHTML($article["content"])) {
 137                         $xpath = new DOMXPath($doc);
 138                         $imgs = $xpath->query("//img[@src]");
 139
 140                         foreach ($imgs as $img) {
 141                                 $new_src = $this->rewrite_url_if_needed($img->getAttribute("src"), $proxy_all);
 142
 143                                 if ($new_src != $img->getAttribute("src")) {
 144                                         $img->setAttribute("src", $new_src);
 145                                         $img->removeAttribute("srcset");
 146
 147                                         $need_saving = true;
 148                                 }
 149                         }
 150
 151                         $vids = $xpath->query("//video");
 152
 153                         foreach ($vids as $vid) {
 154                                 if ($vid->hasAttribute("poster")) {
 155                                         $new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"), $proxy_all);
 156
 157                                         if ($new_src != $vid->getAttribute("poster")) {
 158                                                 $vid->setAttribute("poster", $new_src);
 159
 160                                                 $need_saving = true;
 161                                         }
 162                                 }
 163
 164                                 $vsrcs = $xpath->query("source", $vid);
 165
 166                                 foreach ($vsrcs as $vsrc) {
 167                                         $new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), $proxy_all);
 168
 169                                         if ($new_src != $vsrc->getAttribute("src")) {
 170                                                 $vid->setAttribute("src", $new_src);
 171
 172                                                 $need_saving = true;
 173                                         }
 174                                 }
 175                         }
 176                 }
 177
 178                 if ($need_saving) $article["content"] = $doc->saveXML();
 179
 180                 return $article;
 181         }
 182
 183         function hook_prefs_tab($args) {
 184                 if ($args != "prefFeeds") return;
 185
 186                 print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Image proxy settings (af_zz_imgproxy)')."\">";
 187
 188                 print "<form dojoType=\"dijit.form.Form\">";
 189
 190                 print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
 191                         evt.preventDefault();
 192                         if (this.validate()) {
 193                                 console.log(dojo.objectToQuery(this.getValues()));
 194                                 new Ajax.Request('backend.php', {
 195                                         parameters: dojo.objectToQuery(this.getValues()),
 196                                         onComplete: function(transport) {
 197                                                 notify_info(transport.responseText);
 198                                         }
 199                                 });
 200                                 //this.reset();
 201                         }
 202                         </script>";
 203
 204                 print_hidden("op", "pluginhandler");
 205                 print_hidden("method", "save");
 206                 print_hidden("plugin", "af_zz_imgproxy");
 207
 208                 $proxy_all = $this->host->get($this, "proxy_all");
 209                 print_checkbox("proxy_all", $proxy_all);
 210
 211                 print "&nbsp;<label for=\"proxy_all\">" . __("Enable proxy for all remote images.") . "</label>";
 212
 213                 print "<p>"; print_button("submit", __("Save"));
 214
 215                 print "</form>";
 216
 217                 print "</div>";
 218         }
 219
 220         function save() {
 221                 $proxy_all = checkbox_to_sql_bool($_POST["proxy_all"]) == "true";
 222
 223                 $this->host->set($this, "proxy_all", $proxy_all);
 224
 225                 echo __("Configuration saved");
 226         }
 227
 228         function api_version() {
 229                 return 2;
 230         }
 231 }