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- <?php
- class Af_Zz_ImgProxy extends Plugin {
- private $host;
- function about() {
- return array(1.0,
- "Load insecure images via built-in proxy",
- "fox");
- }
- private $ssl_known_whitelist = "imgur.com gfycat.com i.reddituploads.com pbs.twimg.com i.redd.it i.sli.mg media.tumblr.com";
- function is_public_method($method) {
- return $method === "imgproxy";
- }
- function init($host) {
- $this->host = $host;
- $host->add_hook($host::HOOK_RENDER_ARTICLE, $this);
- $host->add_hook($host::HOOK_RENDER_ARTICLE_CDM, $this);
- $host->add_hook($host::HOOK_ENCLOSURE_ENTRY, $this);
- $host->add_hook($host::HOOK_PREFS_TAB, $this);
- }
- function hook_enclosure_entry($enc) {
- if (preg_match("/image/", $enc["content_type"])) {
- $proxy_all = $this->host->get($this, "proxy_all");
- $enc["content_url"] = $this->rewrite_url_if_needed($enc["content_url"], $proxy_all);
- }
- return $enc;
- }
- function hook_render_article($article) {
- return $this->hook_render_article_cdm($article);
- }
- public function imgproxy() {
- $url = rewrite_relative_url(get_self_url_prefix(), $_REQUEST["url"]);
- // called without user context, let's just redirect to original URL
- if (!$_SESSION["uid"]) {
- header("Location: $url");
- return;
- }
- $local_filename = CACHE_DIR . "/images/" . sha1($url);
- if ($_REQUEST["debug"] == "1") { print $url . "\n" . $local_filename; die; }
- header("Content-Disposition: inline; filename=\"".basename($local_filename)."\"");
- if (file_exists($local_filename)) {
- $mimetype = mime_content_type($local_filename);
- header("Content-type: $mimetype");
- $stamp = gmdate("D, d M Y H:i:s", filemtime($local_filename)). " GMT";
- header("Last-Modified: $stamp", true);
- readfile($local_filename);
- } else {
- $data = fetch_file_contents(array("url" => $url));
- if ($data) {
- $disable_cache = $this->host->get($this, "disable_cache");
- if (!$disable_cache && strlen($data) > MIN_CACHE_FILE_SIZE) {
- if (file_put_contents($local_filename, $data)) {
- $mimetype = mime_content_type($local_filename);
- header("Content-type: $mimetype");
- }
- }
- print $data;
- } else {
- global $fetch_last_error;
- global $fetch_last_error_code;
- global $fetch_last_error_content;
- if (function_exists("imagecreate") && !isset($_REQUEST["text"])) {
- $img = imagecreate(450, 75);
- /*$bg =*/ imagecolorallocate($img, 255, 255, 255);
- $textcolor = imagecolorallocate($img, 255, 0, 0);
- imagerectangle($img, 0, 0, 450-1, 75-1, $textcolor);
- imagestring($img, 5, 5, 5, "Proxy request failed", $textcolor);
- imagestring($img, 5, 5, 30, truncate_middle($url, 46, "..."), $textcolor);
- imagestring($img, 5, 5, 55, "HTTP Code: $fetch_last_error_code", $textcolor);
- header("Content-type: image/png");
- print imagepng($img);
- imagedestroy($img);
- } else {
- header("Content-type: text/html");
- http_response_code(400);
- print "<h1>Proxy request failed.</h1>";
- print "<p>Fetch error $fetch_last_error ($fetch_last_error_code)</p>";
- print "<p>URL: $url</p>";
- print "<textarea cols='80' rows='25'>" . htmlspecialchars($fetch_last_error_content) . "</textarea>";
- }
- }
- }
- }
- function rewrite_url_if_needed($url, $all_remote = false) {
- $scheme = parse_url($url, PHP_URL_SCHEME);
- if ($all_remote) {
- $host = parse_url($url, PHP_URL_HOST);
- $self_host = parse_url(get_self_url_prefix(), PHP_URL_HOST);
- $is_remote = $host != $self_host;
- } else {
- $is_remote = false;
- }
- if (($scheme != 'https' && $scheme != "") || $is_remote) {
- if (strpos($url, "data:") !== 0) {
- $parts = parse_url($url);
- foreach (explode(" " , $this->ssl_known_whitelist) as $host) {
- if (substr(strtolower($parts['host']), -strlen($host)) === strtolower($host)) {
- $parts['scheme'] = 'https';
- $url = build_url($parts);
- if ($all_remote && $is_remote) {
- break;
- } else {
- return $url;
- }
- }
- }
- return get_self_url_prefix() . "/public.php?op=pluginhandler&plugin=af_zz_imgproxy&pmethod=imgproxy&url=" .
- urlencode($url);
- }
- }
- return $url;
- }
- /**
- * @SuppressWarnings(PHPMD.UnusedFormalParameter)
- */
- function hook_render_article_cdm($article, $api_mode = false) {
- $need_saving = false;
- $proxy_all = $this->host->get($this, "proxy_all");
- $doc = new DOMDocument();
- if (@$doc->loadHTML($article["content"])) {
- $xpath = new DOMXPath($doc);
- $imgs = $xpath->query("//img[@src]");
- foreach ($imgs as $img) {
- $new_src = $this->rewrite_url_if_needed($img->getAttribute("src"), $proxy_all);
- if ($new_src != $img->getAttribute("src")) {
- $img->setAttribute("src", $new_src);
- $img->removeAttribute("srcset");
- $need_saving = true;
- }
- }
- $vids = $xpath->query("//video");
- foreach ($vids as $vid) {
- if ($vid->hasAttribute("poster")) {
- $new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"), $proxy_all);
- if ($new_src != $vid->getAttribute("poster")) {
- $vid->setAttribute("poster", $new_src);
- $need_saving = true;
- }
- }
- $vsrcs = $xpath->query("source", $vid);
- foreach ($vsrcs as $vsrc) {
- $new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), $proxy_all);
- if ($new_src != $vsrc->getAttribute("src")) {
- $vid->setAttribute("src", $new_src);
- $need_saving = true;
- }
- }
- }
- }
- if ($need_saving) $article["content"] = $doc->saveHTML();
- return $article;
- }
- function hook_prefs_tab($args) {
- if ($args != "prefFeeds") return;
- print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Image proxy settings (af_zz_imgproxy)')."\">";
- print "<form dojoType=\"dijit.form.Form\">";
- print "<script type=\"dojo/method\" event=\"onSubmit\" args=\"evt\">
- evt.preventDefault();
- if (this.validate()) {
- console.log(dojo.objectToQuery(this.getValues()));
- new Ajax.Request('backend.php', {
- parameters: dojo.objectToQuery(this.getValues()),
- onComplete: function(transport) {
- notify_info(transport.responseText);
- }
- });
- //this.reset();
- }
- </script>";
- print_hidden("op", "pluginhandler");
- print_hidden("method", "save");
- print_hidden("plugin", "af_zz_imgproxy");
- $proxy_all = $this->host->get($this, "proxy_all");
- print_checkbox("proxy_all", $proxy_all);
- print " <label for=\"proxy_all\">" . __("Enable proxy for all remote images.") . "</label><br/>";
- $disable_cache = $this->host->get($this, "disable_cache");
- print_checkbox("disable_cache", $disable_cache);
- print " <label for=\"disable_cache\">" . __("Don't cache files locally.") . "</label>";
- print "<p>"; print_button("submit", __("Save"));
- print "</form>";
- print "</div>";
- }
- function save() {
- $proxy_all = checkbox_to_sql_bool($_POST["proxy_all"]) == "true";
- $disable_cache = checkbox_to_sql_bool($_POST["disable_cache"]) == "true";
- $this->host->set($this, "proxy_all", $proxy_all, false);
- $this->host->set($this, "disable_cache", $disable_cache);
- echo __("Configuration saved");
- }
- function api_version() {
- return 2;
- }
- }
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