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/", $enc["content_type"]) || preg_match("/\.(jpe?g|png|gif|bmp)$/i", $enc["filename"])) {
  27                         $proxy_all = $this->host->get($this, "proxy_all");
  28
  29                         $enc["content_url"] = $this->rewrite_url_if_needed($enc["content_url"], 0, $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                 $kind = (int) $_REQUEST["kind"]; // 1 = video
  43
  44                 // called without user context, let's just redirect to original URL
  45                 if (!$_SESSION["uid"]) {
  46                         header("Location: $url");
  47                         return;
  48                 }
  49
  50                 $extension = $kind == 1 ? '.mp4' : '.png';
  51                 $local_filename = CACHE_DIR . "/images/" . sha1($url) . $extension;
  52
  53                 if ($_REQUEST["debug"] == "1") { print $url . "\n" . $local_filename; die; }
  54
  55                 header("Content-Disposition: inline; filename=\"".basename($local_filename)."\"");
  56
  57                 if (file_exists($local_filename)) {
  58                         $mimetype = mime_content_type($local_filename);
  59                         header("Content-type: $mimetype");
  60
  61                         $stamp = gmdate("D, d M Y H:i:s", filemtime($local_filename)). " GMT";
  62                         header("Last-Modified: $stamp", true);
  63
  64                         readfile($local_filename);
  65                 } else {
  66                         $data = fetch_file_contents(array("url" => $url));
  67
  68                         if ($data) {
  69                                 if (file_put_contents($local_filename, $data)) {
  70                                         $mimetype = mime_content_type($local_filename);
  71                                         header("Content-type: $mimetype");
  72                                 }
  73
  74                                 print $data;
  75                         }
  76                 }
  77         }
  78
  79         function rewrite_url_if_needed($url, $kind, $all_remote = false) {
  80                 $scheme = parse_url($url, PHP_URL_SCHEME);
  81
  82                 if ($all_remote) {
  83                         $host = parse_url($url, PHP_URL_HOST);
  84                         $self_host = parse_url(SELF_URL_PATH, PHP_URL_HOST);
  85
  86                         $is_remote = $host != $self_host;
  87                 } else {
  88                         $is_remote = false;
  89                 }
  90
  91                 if (($scheme != 'https' && $scheme != "") || $is_remote) {
  92                         if (strpos($url, "data:") !== 0) {
  93                                 $url = "public.php?op=pluginhandler&plugin=af_zz_imgproxy&pmethod=imgproxy&kind=$kind&url=" .
  94                                         urlencode($url);
  95                         }
  96                 }
  97
  98                 return $url;
  99         }
 100
 101         function hook_render_article_cdm($article, $api_mode = false) {
 102
 103                 $need_saving = false;
 104                 $proxy_all = $this->host->get($this, "proxy_all");
 105
 106                 $doc = new DOMDocument();
 107                 if (@$doc->loadHTML($article["content"])) {
 108                         $xpath = new DOMXPath($doc);
 109                         $imgs = $xpath->query("//img[@src]");
 110
 111                         foreach ($imgs as $img) {
 112                                 $new_src = $this->rewrite_url_if_needed($img->getAttribute("src"), 0, $proxy_all);
 113
 114                                 if ($new_src != $img->getAttribute("src")) {
 115                                         $img->setAttribute("src", $new_src);
 116
 117                                         $need_saving = true;
 118                                 }
 119                         }
 120
 121                         $vids = $xpath->query("//video");
 122
 123                         foreach ($vids as $vid) {
 124                                 if ($vid->hasAttribute("poster")) {
 125                                         $new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"), 0, $proxy_all);
 126
 127                                         if ($new_src != $vid->getAttribute("poster")) {
 128                                                 $vid->setAttribute("poster", $new_src);
 129
 130                                                 $need_saving = true;
 131                                         }
 132                                 }
 133
 134                                 $vsrcs = $xpath->query("source", $vid);
 135
 136                                 foreach ($vsrcs as $vsrc) {
 137                                         $new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), 1, $proxy_all);
 138
 139                                         if ($new_src != $vsrc->getAttribute("src")) {
 140                                                 $vid->setAttribute("src", $new_src);
 141
 142                                                 $need_saving = true;
 143                                         }
 144                                 }
 145                         }
 146                 }
 147
 148                 if ($need_saving) $article["content"] = $doc->saveXML();
 149
 150                 return $article;
 151         }
 152
 153         function hook_prefs_tab($args) {
 154                 if ($args != "prefFeeds") return;
 155
 156                 print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Image proxy settings (af_zz_imgproxy)')."\">";
 157
 158                 print "<form dojoType=\"dijit.form.Form\">";
 159
 160                 print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
 161                         evt.preventDefault();
 162                         if (this.validate()) {
 163                                 console.log(dojo.objectToQuery(this.getValues()));
 164                                 new Ajax.Request('backend.php', {
 165                                         parameters: dojo.objectToQuery(this.getValues()),
 166                                         onComplete: function(transport) {
 167                                                 notify_info(transport.responseText);
 168                                         }
 169                                 });
 170                                 //this.reset();
 171                         }
 172                         </script>";
 173
 174                 print_hidden("op", "pluginhandler");
 175                 print_hidden("method", "save");
 176                 print_hidden("plugin", "af_zz_imgproxy");
 177
 178                 $proxy_all = $this->host->get($this, "proxy_all");
 179                 print_checkbox("proxy_all", $proxy_all);
 180
 181                 print "&nbsp;<label for=\"proxy_all\">" . __("Enable proxy for all remote images.") . "</label>";
 182
 183                 print "<p>"; print_button("submit", __("Save"));
 184
 185                 print "</form>";
 186
 187                 print "</div>";
 188         }
 189
 190         function save() {
 191                 $proxy_all = checkbox_to_sql_bool($_POST["proxy_all"]) == "true";
 192
 193                 $this->host->set($this, "proxy_all", $proxy_all);
 194
 195                 echo __("Configuration saved");
 196         }
 197
 198         function api_version() {
 199                 return 2;
 200         }
 201 }