253 lines
6.5 KiB
PHP
253 lines
6.5 KiB
PHP
<?php
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class Af_Proxy_Http extends Plugin {
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/* @var PluginHost $host */
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private $host;
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/* @var DiskCache $cache */
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private $cache;
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function about() {
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return array(1.0,
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"Loads media served over plain HTTP via built-in secure proxy",
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"fox");
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}
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private $ssl_known_whitelist = "imgur.com gfycat.com i.reddituploads.com pbs.twimg.com i.redd.it i.sli.mg media.tumblr.com";
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function is_public_method($method) {
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return $method === "imgproxy";
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}
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function init($host) {
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$this->host = $host;
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$this->cache = new DiskCache("images");
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$host->add_hook($host::HOOK_RENDER_ARTICLE, $this, 150);
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$host->add_hook($host::HOOK_RENDER_ARTICLE_CDM, $this, 150);
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$host->add_hook($host::HOOK_ENCLOSURE_ENTRY, $this);
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$host->add_hook($host::HOOK_PREFS_TAB, $this);
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if (empty($_SESSION['af_proxy_http_token']))
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$_SESSION['af_proxy_http_token'] = bin2hex(get_random_bytes(16));
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}
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function hook_enclosure_entry($enc) {
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if (preg_match("/image/", $enc["content_type"])) {
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$proxy_all = $this->host->get($this, "proxy_all");
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$enc["content_url"] = $this->rewrite_url_if_needed($enc["content_url"], $proxy_all);
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}
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return $enc;
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}
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function hook_render_article($article) {
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return $this->hook_render_article_cdm($article);
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}
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public function imgproxy() {
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$url = UrlHelper::validate(clean($_REQUEST["url"]));
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// immediately redirect to original URL if:
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// - url points back to ourselves
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// - called without user context
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// - session-spefific token is invalid
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if (
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strpos($url, get_self_url_prefix()) === 0 ||
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empty($_SESSION["uid"]) ||
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$_REQUEST['af_proxy_http_token'] != $_SESSION['af_proxy_http_token']) {
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header("Location: $url");
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return;
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}
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$local_filename = sha1($url);
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if ($this->cache->exists($local_filename)) {
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header("Location: " . $this->cache->get_url($local_filename));
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return;
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} else {
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$data = UrlHelper::fetch(["url" => $url, "max_size" => Config::get(Config::MAX_CACHE_FILE_SIZE)]);
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if ($data) {
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if ($this->cache->put($local_filename, $data)) {
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header("Location: " . $this->cache->get_url($local_filename));
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return;
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}
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} else {
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if (function_exists("imagecreate") && !isset($_REQUEST["text"])) {
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$img = imagecreate(450, 75);
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/*$bg =*/ imagecolorallocate($img, 255, 255, 255);
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$textcolor = imagecolorallocate($img, 255, 0, 0);
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imagerectangle($img, 0, 0, 450-1, 75-1, $textcolor);
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imagestring($img, 5, 5, 5, "Proxy request failed", $textcolor);
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imagestring($img, 5, 5, 30, truncate_middle($url, 46, "..."), $textcolor);
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imagestring($img, 5, 5, 55, "HTTP Code: ".UrlHelper::$fetch_last_error_code, $textcolor);
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header("Content-type: image/png");
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print imagepng($img);
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imagedestroy($img);
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} else {
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header("Content-type: text/plain");
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http_response_code(400);
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print "Proxy request failed.\n".
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"Fetch error ".UrlHelper::$fetch_last_error." (".UrlHelper::$fetch_last_error_code.")\n".
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"Requested URL: $url";
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}
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}
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}
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}
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private function rewrite_url_if_needed($url, $all_remote = false) {
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/* don't rewrite urls pointing to ourselves */
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if (strpos($url, get_self_url_prefix()) === 0)
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return $url;
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/* we don't need to handle URLs where local cache already exists, tt-rss rewrites those automatically */
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if (!$this->cache->exists(sha1($url))) {
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$scheme = parse_url($url, PHP_URL_SCHEME);
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if ($all_remote) {
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$host = parse_url($url, PHP_URL_HOST);
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$self_host = parse_url(get_self_url_prefix(), PHP_URL_HOST);
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$is_remote = $host != $self_host;
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} else {
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$is_remote = false;
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}
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if (($scheme != 'https' && $scheme != "") || $is_remote) {
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if (strpos($url, "data:") !== 0) {
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$parts = parse_url($url);
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foreach (explode(" " , $this->ssl_known_whitelist) as $host) {
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if (substr(strtolower($parts['host']), -strlen($host)) === strtolower($host)) {
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$parts['scheme'] = 'https';
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$url = UrlHelper::build_url($parts);
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if ($all_remote && $is_remote) {
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break;
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} else {
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return $url;
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}
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}
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}
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return $this->host->get_public_method_url($this, "imgproxy",
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["url" => $url, "af_proxy_http_token" => $_SESSION["af_proxy_http_token"]]);
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}
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}
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}
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return $url;
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}
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function hook_render_article_cdm($article, $api_mode = false) {
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$need_saving = false;
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$proxy_all = $this->host->get($this, "proxy_all");
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$doc = new DOMDocument();
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if (@$doc->loadHTML('<?xml encoding="UTF-8">' . $article["content"])) {
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$xpath = new DOMXPath($doc);
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$imgs = $xpath->query("//img[@src]");
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foreach ($imgs as $img) {
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$new_src = $this->rewrite_url_if_needed($img->getAttribute("src"), $proxy_all);
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if ($new_src != $img->getAttribute("src")) {
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$img->setAttribute("src", $new_src);
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$img->removeAttribute("srcset");
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$need_saving = true;
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}
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}
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$vids = $xpath->query("(//video|//picture)");
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foreach ($vids as $vid) {
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if ($vid->hasAttribute("poster")) {
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$new_src = $this->rewrite_url_if_needed($vid->getAttribute("poster"), $proxy_all);
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if ($new_src != $vid->getAttribute("poster")) {
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$vid->setAttribute("poster", $new_src);
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$need_saving = true;
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}
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}
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$vsrcs = $xpath->query("source", $vid);
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foreach ($vsrcs as $vsrc) {
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$new_src = $this->rewrite_url_if_needed($vsrc->getAttribute("src"), $proxy_all);
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if ($new_src != $vsrc->getAttribute("src")) {
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$vid->setAttribute("src", $new_src);
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$need_saving = true;
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}
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}
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}
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}
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if ($need_saving) $article["content"] = $doc->saveHTML();
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return $article;
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}
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function hook_prefs_tab($args) {
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if ($args != "prefFeeds") return;
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?>
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<div dojoType="dijit.layout.AccordionPane"
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title="<i class='material-icons'>extension</i> <?= __('Image proxy settings (af_proxy_http)') ?>">
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<form dojoType="dijit.form.Form">
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<?= \Controls\pluginhandler_tags($this, "save") ?>
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<script type="dojo/method" event="onSubmit" args="evt">
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evt.preventDefault();
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if (this.validate()) {
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xhr.post("backend.php", this.getValues(), (reply) => {
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Notify.info(reply);
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})
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}
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</script>
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<fieldset>
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<label class="checkbox">
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<?= \Controls\checkbox_tag("proxy_all", $this->host->get($this, "proxy_all")) ?>
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<?= __("Enable proxy for all remote images.") ?>
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</label>
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</fieldset>
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<hr/>
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<?= \Controls\submit_tag(__("Save")) ?>
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</form>
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</div>
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<?php
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}
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function save() {
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$proxy_all = checkbox_to_sql_bool($_POST["proxy_all"] ?? "");
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$this->host->set($this, "proxy_all", $proxy_all);
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echo __("Configuration saved");
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}
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function api_version() {
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return 2;
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}
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}
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