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, $this);
  21                 //$host->add_hook($host::HOOK_ARTICLE_FILTER, $this);
  22
  23                 $host->add_hook($host::HOOK_PREFS_TAB, $this);
  24         }
  25
  26         function hook_enclosure_entry($enc) {
  27                 if (preg_match("/image/", $enc["content_type"]) || preg_match("/\.(jpe?g|png|gif|bmp)$/i", $enc["filename"])) {
  28                         $proxy_all = $this->host->get($this, "proxy_all");
  29
  30                         $enc["content_url"] = $this->rewrite_url_if_needed($enc["content_url"], 0, $proxy_all);
  31                 }
  32
  33                 return $enc;
  34         }
  35
  36         function hook_article_filter($article) {
  37                 return $this->hook_render_article_cdm($article);
  38         }
  39
  40         function hook_render_article($article) {
  41                 return $this->hook_render_article_cdm($article);
  42         }
  43
  44         public function imgproxy() {
  45
  46                 $url = rewrite_relative_url(SELF_URL_PATH, $_REQUEST["url"]);
  47                 $kind = (int) $_REQUEST["kind"]; // 1 = video
  48
  49                 // called without user context, let's just redirect to original URL
  50                 if (!$_SESSION["uid"]) {
  51                         header("Location: $url");
  52                         return;
  53                 }
  54
  55                 $extension = $kind == 1 ? '.mp4' : '.png';
  56                 $local_filename = CACHE_DIR . "/images/" . sha1($url) . $extension;
  57
  58                 if ($_REQUEST["debug"] == "1") { print $url . "\n" . $local_filename; die; }
  59
  60                 header("Content-Disposition: inline; filename=\"".basename($local_filename)."\"");
  61
  62                 if (file_exists($local_filename)) {
  63                         $mimetype = mime_content_type($local_filename);
  64                         header("Content-type: $mimetype");
  65
  66                         $stamp = gmdate("D, d M Y H:i:s", filemtime($local_filename)). " GMT";
  67                         header("Last-Modified: $stamp", true);
  68
  69                         readfile($local_filename);
  70                 } else {
  71                         $data = fetch_file_contents(array("url" => $url));
  72
  73                         if ($data) {
  74                                 if (file_put_contents($local_filename, $data)) {
  75                                         $mimetype = mime_content_type($local_filename);
  76                                         header("Content-type: $mimetype");
  77                                 }
  78
  79                                 print $data;
  80                         } else {
  81                                 global $fetch_last_error;
  82                                 global $fetch_last_error_code;
  83                                 global $fetch_last_error_content;
  84
  85                                 if (function_exists("imagecreate") && !isset($_REQUEST["text"])) {
  86                                         $img = imagecreate(450, 75);
  87
  88                                         $bg = imagecolorallocate($img, 255, 255, 255);
  89                                         $textcolor = imagecolorallocate($img, 255, 0, 0);
  90
  91                                         imagerectangle($img, 0, 0, 450-1, 75-1, $textcolor);
  92
  93                                         imagestring($img, 5, 5, 5, "Proxy request failed", $textcolor);
  94                                         imagestring($img, 5, 5, 30, truncate_middle($url, 46, "..."), $textcolor);
  95                                         imagestring($img, 5, 5, 55, "HTTP Code: $fetch_last_error_code", $textcolor);
  96
  97                                         header("Content-type: image/png");
  98                                         print imagepng($img);
  99                                         imagedestroy($img);
 100
 101                                 } else {
 102                                         header("Content-type: text/html");
 103
 104                                         http_response_code(400);
 105
 106                                         print "<h1>Proxy request failed.</h1>";
 107                                         print "<p>Fetch error $fetch_last_error ($fetch_last_error_code)</p>";
 108                                         print "<p>URL: $url</p>";
 109                                         print "<textarea cols='80' rows='25'>" . htmlspecialchars($fetch_last_error_content) . "</textarea>";
 110                                 }
 111                         }
 112                 }
 113         }
 114
 115         function rewrite_url_if_needed($url, $kind, $all_remote = false) {
 116                 $scheme = parse_url($url, PHP_URL_SCHEME);
 117
 118                 if ($all_remote) {
 119                         $host = parse_url($url, PHP_URL_HOST);
 120                         $self_host = parse_url(SELF_URL_PATH, PHP_URL_HOST);
 121
 122                         $is_remote = $host != $self_host;
 123                 } else {
 124                         $is_remote = false;
 125                 }
 126
 127                 if (($scheme != 'https' && $scheme != "") || $is_remote) {
 128                         if (strpos($url, "data:") !== 0) {
 129                                 $url = get_self_url_prefix() . "/public.php?op=pluginhandler&plugin=af_zz_imgproxy&pmethod=imgproxy&kind=$kind&url=" .
 130                                         urlencode($url);
 131                         }
 132                 }
 133
 134                 return $url;
 135         }
 136
 137         function hook_render_article_cdm($article, $api_mode = false) {
 138
 139                 $need_saving = false;
 140                 $proxy_all = $this->host->get($this, "proxy_all");
 141
 142                 $doc = new DOMDocument();
 143                 if (@$doc->loadHTML($article["content"])) {
 144                         $xpath = new DOMXPath($doc);
 145                         $imgs = $xpath->query("//img[@src]");
 146
 147                         foreach ($imgs as $img) {
 148                                 $new_src = $this->rewrite_url_if_needed($img->getAttribute("src"), 0, $proxy_all);
 149
 150                                 if ($new_src != $img->getAttribute("src")) {
 151                                         $img->setAttribute("src", $new_src);
 152                                         $img->removeAttribute("srcset");
 153
 154                                         $need_saving = true;
 155                                 }
 156                         }
 157
 158                         $vids = $xpath->query("//video");
 159
 160                         foreach ($vids as $vid) {
 161                                 if ($vid->hasAttribute("poster")) {
 162                                         $new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"), 0, $proxy_all);
 163
 164                                         if ($new_src != $vid->getAttribute("poster")) {
 165                                                 $vid->setAttribute("poster", $new_src);
 166
 167                                                 $need_saving = true;
 168                                         }
 169                                 }
 170
 171                                 $vsrcs = $xpath->query("source", $vid);
 172
 173                                 foreach ($vsrcs as $vsrc) {
 174                                         $new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), 1, $proxy_all);
 175
 176                                         if ($new_src != $vsrc->getAttribute("src")) {
 177                                                 $vid->setAttribute("src", $new_src);
 178
 179                                                 $need_saving = true;
 180                                         }
 181                                 }
 182                         }
 183                 }
 184
 185                 if ($need_saving) $article["content"] = $doc->saveXML();
 186
 187                 return $article;
 188         }
 189
 190         function hook_prefs_tab($args) {
 191                 if ($args != "prefFeeds") return;
 192
 193                 print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Image proxy settings (af_zz_imgproxy)')."\">";
 194
 195                 print "<form dojoType=\"dijit.form.Form\">";
 196
 197                 print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
 198                         evt.preventDefault();
 199                         if (this.validate()) {
 200                                 console.log(dojo.objectToQuery(this.getValues()));
 201                                 new Ajax.Request('backend.php', {
 202                                         parameters: dojo.objectToQuery(this.getValues()),
 203                                         onComplete: function(transport) {
 204                                                 notify_info(transport.responseText);
 205                                         }
 206                                 });
 207                                 //this.reset();
 208                         }
 209                         </script>";
 210
 211                 print_hidden("op", "pluginhandler");
 212                 print_hidden("method", "save");
 213                 print_hidden("plugin", "af_zz_imgproxy");
 214
 215                 $proxy_all = $this->host->get($this, "proxy_all");
 216                 print_checkbox("proxy_all", $proxy_all);
 217
 218                 print "&nbsp;<label for=\"proxy_all\">" . __("Enable proxy for all remote images.") . "</label>";
 219
 220                 print "<p>"; print_button("submit", __("Save"));
 221
 222                 print "</form>";
 223
 224                 print "</div>";
 225         }
 226
 227         function save() {
 228                 $proxy_all = checkbox_to_sql_bool($_POST["proxy_all"]) == "true";
 229
 230                 $this->host->set($this, "proxy_all", $proxy_all);
 231
 232                 echo __("Configuration saved");
 233         }
 234
 235         function api_version() {
 236                 return 2;
 237         }
 238 }