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                 $host->add_hook($host::HOOK_ENCLOSURE_ENTRY, $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 $enc;
  34         }
  35
  36         function hook_render_article($article) {
  37                 return $this->hook_render_article_cdm($article);
  38         }
  39
  40         function hook_render_article_api($headline) {
  41                 return $this->hook_render_article_cdm($headline["headline"], true);
  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 $data;
  80                         }
  81                 }
  82         }
  83
  84         function rewrite_url_if_needed($url, $kind, $all_remote = false) {
  85                 $scheme = parse_url($url, PHP_URL_SCHEME);
  86
  87                 if ($all_remote) {
  88                         $host = parse_url($url, PHP_URL_HOST);
  89                         $self_host = parse_url(SELF_URL_PATH, PHP_URL_HOST);
  90
  91                         $is_remote = $host != $self_host;
  92                 } else {
  93                         $is_remote = false;
  94                 }
  95
  96                 if (($scheme != 'https' && $scheme != "") || $is_remote) {
  97                         if (strpos($url, "data:") !== 0) {
  98                                 $url = "public.php?op=pluginhandler&plugin=af_zz_imgproxy&pmethod=imgproxy&kind=$kind&url=" .
  99                                         urlencode($url);
 100                         }
 101                 }
 102
 103                 return $url;
 104         }
 105
 106         function hook_render_article_cdm($article, $api_mode = false) {
 107
 108                 $need_saving = false;
 109                 $proxy_all = $this->host->get($this, "proxy_all");
 110
 111                 $doc = new DOMDocument();
 112                 if (@$doc->loadHTML($article["content"])) {
 113                         $xpath = new DOMXPath($doc);
 114                         $imgs = $xpath->query("//img[@src]");
 115
 116                         foreach ($imgs as $img) {
 117                                 $new_src = $this->rewrite_url_if_needed($img->getAttribute("src"), 0, $proxy_all);
 118
 119                                 if ($new_src != $img->getAttribute("src")) {
 120                                         $img->setAttribute("src", $new_src);
 121
 122                                         $need_saving = true;
 123                                 }
 124                         }
 125
 126                         $vids = $xpath->query("//video");
 127
 128                         foreach ($vids as $vid) {
 129                                 if ($vid->hasAttribute("poster")) {
 130                                         $new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"), 0, $proxy_all);
 131
 132                                         if ($new_src != $vid->getAttribute("poster")) {
 133                                                 $vid->setAttribute("poster", $new_src);
 134
 135                                                 $need_saving = true;
 136                                         }
 137                                 }
 138
 139                                 $vsrcs = $xpath->query("source", $vid);
 140
 141                                 foreach ($vsrcs as $vsrc) {
 142                                         $new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), 1, $proxy_all);
 143
 144                                         if ($new_src != $vsrc->getAttribute("src")) {
 145                                                 $vid->setAttribute("src", $new_src);
 146
 147                                                 $need_saving = true;
 148                                         }
 149                                 }
 150                         }
 151                 }
 152
 153                 if ($need_saving) $article["content"] = $doc->saveXML();
 154
 155                 return $article;
 156         }
 157
 158         function hook_prefs_tab($args) {
 159                 if ($args != "prefFeeds") return;
 160
 161                 print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Image proxy settings (af_zz_imgproxy)')."\">";
 162
 163                 print "<form dojoType=\"dijit.form.Form\">";
 164
 165                 print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
 166                         evt.preventDefault();
 167                         if (this.validate()) {
 168                                 console.log(dojo.objectToQuery(this.getValues()));
 169                                 new Ajax.Request('backend.php', {
 170                                         parameters: dojo.objectToQuery(this.getValues()),
 171                                         onComplete: function(transport) {
 172                                                 notify_info(transport.responseText);
 173                                         }
 174                                 });
 175                                 //this.reset();
 176                         }
 177                         </script>";
 178
 179                 print_hidden("op", "pluginhandler");
 180                 print_hidden("method", "save");
 181                 print_hidden("plugin", "af_zz_imgproxy");
 182
 183                 $proxy_all = $this->host->get($this, "proxy_all");
 184                 print_checkbox("proxy_all", $proxy_all);
 185
 186                 print "&nbsp;<label for=\"proxy_all\">" . __("Enable proxy for all remote images.") . "</label>";
 187
 188                 print "<p>"; print_button("submit", __("Save"));
 189
 190                 print "</form>";
 191
 192                 print "</div>";
 193         }
 194
 195         function save() {
 196                 $proxy_all = checkbox_to_sql_bool($_POST["proxy_all"]) == "true";
 197
 198                 $this->host->set($this, "proxy_all", $proxy_all);
 199
 200                 echo __("Configuration saved");
 201         }
 202
 203         function api_version() {
 204                 return 2;
 205         }
 206 }