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                 $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                 return $enc;
  32         }
  33
  34         function hook_render_article($article) {
  35                 return $this->hook_render_article_cdm($article);
  36         }
  37
  38         function hook_render_article_api($headline) {
  39                 return $this->hook_render_article_cdm($headline["headline"], true);
  40         }
  41
  42         public function imgproxy() {
  43
  44                 $url = rewrite_relative_url(SELF_URL_PATH, $_REQUEST["url"]);
  45                 $kind = (int) $_REQUEST["kind"]; // 1 = video
  46
  47                 // called without user context, let's just redirect to original URL
  48                 if (!$_SESSION["uid"]) {
  49                         header("Location: $url");
  50                         return;
  51                 }
  52
  53                 $extension = $kind == 1 ? '.mp4' : '.png';
  54                 $local_filename = CACHE_DIR . "/images/" . sha1($url) . $extension;
  55
  56                 if ($_REQUEST["debug"] == "1") { print $url . "\n" . $local_filename; die; }
  57
  58                 header("Content-Disposition: inline; filename=\"".basename($local_filename)."\"");
  59
  60                 if (file_exists($local_filename)) {
  61                         $mimetype = mime_content_type($local_filename);
  62                         header("Content-type: $mimetype");
  63
  64                         $stamp = gmdate("D, d M Y H:i:s", filemtime($local_filename)). " GMT";
  65                         header("Last-Modified: $stamp", true);
  66
  67                         readfile($local_filename);
  68                 } else {
  69                         $data = fetch_file_contents(array("url" => $url));
  70
  71                         if ($data) {
  72                                 if (file_put_contents($local_filename, $data)) {
  73                                         $mimetype = mime_content_type($local_filename);
  74                                         header("Content-type: $mimetype");
  75                                 }
  76
  77                                 print $data;
  78                         }
  79                 }
  80         }
  81
  82         function rewrite_url_if_needed($url, $kind, $all_remote = false) {
  83                 $scheme = parse_url($url, PHP_URL_SCHEME);
  84
  85                 if ($all_remote) {
  86                         $host = parse_url($url, PHP_URL_HOST);
  87                         $self_host = parse_url(SELF_URL_PATH, PHP_URL_HOST);
  88
  89                         $is_remote = $host != $self_host;
  90                 } else {
  91                         $is_remote = false;
  92                 }
  93
  94                 if (($scheme != 'https' && $scheme != "") || $is_remote) {
  95                         if (strpos($url, "data:") !== 0) {
  96                                 $url = "public.php?op=pluginhandler&plugin=af_zz_imgproxy&pmethod=imgproxy&kind=$kind&url=" .
  97                                         urlencode($url);
  98                         }
  99                 }
 100
 101                 return $url;
 102         }
 103
 104         function hook_render_article_cdm($article, $api_mode = false) {
 105
 106                 $need_saving = false;
 107                 $proxy_all = $this->host->get($this, "proxy_all");
 108
 109                 $doc = new DOMDocument();
 110                 if (@$doc->loadHTML($article["content"])) {
 111                         $xpath = new DOMXPath($doc);
 112                         $imgs = $xpath->query("//img[@src]");
 113
 114                         foreach ($imgs as $img) {
 115                                 $new_src = $this->rewrite_url_if_needed($img->getAttribute("src"), 0, $proxy_all);
 116
 117                                 if ($new_src != $img->getAttribute("src")) {
 118                                         $img->setAttribute("src", $new_src);
 119
 120                                         $need_saving = true;
 121                                 }
 122                         }
 123
 124                         $vids = $xpath->query("//video");
 125
 126                         foreach ($vids as $vid) {
 127                                 if ($vid->hasAttribute("poster")) {
 128                                         $new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"), 0, $proxy_all);
 129
 130                                         if ($new_src != $vid->getAttribute("poster")) {
 131                                                 $vid->setAttribute("poster", $new_src);
 132
 133                                                 $need_saving = true;
 134                                         }
 135                                 }
 136
 137                                 $vsrcs = $xpath->query("source", $vid);
 138
 139                                 foreach ($vsrcs as $vsrc) {
 140                                         $new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), 1, $proxy_all);
 141
 142                                         if ($new_src != $vsrc->getAttribute("src")) {
 143                                                 $vid->setAttribute("src", $new_src);
 144
 145                                                 $need_saving = true;
 146                                         }
 147                                 }
 148                         }
 149                 }
 150
 151                 if ($need_saving) $article["content"] = $doc->saveXML();
 152
 153                 return $article;
 154         }
 155
 156         function hook_prefs_tab($args) {
 157                 if ($args != "prefFeeds") return;
 158
 159                 print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Image proxy settings (af_zz_imgproxy)')."\">";
 160
 161                 print "<form dojoType=\"dijit.form.Form\">";
 162
 163                 print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
 164                         evt.preventDefault();
 165                         if (this.validate()) {
 166                                 console.log(dojo.objectToQuery(this.getValues()));
 167                                 new Ajax.Request('backend.php', {
 168                                         parameters: dojo.objectToQuery(this.getValues()),
 169                                         onComplete: function(transport) {
 170                                                 notify_info(transport.responseText);
 171                                         }
 172                                 });
 173                                 //this.reset();
 174                         }
 175                         </script>";
 176
 177                 print_hidden("op", "pluginhandler");
 178                 print_hidden("method", "save");
 179                 print_hidden("plugin", "af_zz_imgproxy");
 180
 181                 $proxy_all = $this->host->get($this, "proxy_all");
 182                 print_checkbox("proxy_all", $proxy_all);
 183
 184                 print "&nbsp;<label for=\"proxy_all\">" . __("Enable proxy for all remote images.") . "</label>";
 185
 186                 print "<p>"; print_button("submit", __("Save"));
 187
 188                 print "</form>";
 189
 190                 print "</div>";
 191         }
 192
 193         function save() {
 194                 $proxy_all = checkbox_to_sql_bool($_POST["proxy_all"]) == "true";
 195
 196                 $this->host->set($this, "proxy_all", $proxy_all);
 197
 198                 echo __("Configuration saved");
 199         }
 200
 201         function api_version() {
 202                 return 2;
 203         }
 204 }