af_zz_imgproxy: rename to af_proxy_http, use priority hook loader

1 files changed, 263 insertions, 0 deletions

diff --git a/plugins/af_proxy_http/init.php b/plugins/af_proxy_http/init.php
new file mode 100644
index 000000000..13e2eea23
--- /dev/null
+++ b/plugins/af_proxy_http/init.php
@@ -0,0 +1,263 @@
+<?php
+class Af_Proxy_Http extends Plugin {
+
+	/* @var PluginHost $host */
+	private $host;
+
+	/* @var DiskCache $cache */
+	private $cache;
+
+	function about() {
+		return array(1.0,
+			"Loads media served over plain HTTP via built-in secure 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;
+		$this->cache = new DiskCache("images");
+
+		$host->add_hook($host::HOOK_RENDER_ARTICLE, $this, 150);
+		$host->add_hook($host::HOOK_RENDER_ARTICLE_CDM, $this, 150);
+		$host->add_hook($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;
+		}
+
+		$local_filename = sha1($url);
+
+		if ($this->cache->exists($local_filename)) {
+			header("Location: " . $this->cache->getUrl($local_filename));
+			return;
+			//$this->cache->send($local_filename);
+		} else {
+			$data = fetch_file_contents(["url" => $url, "max_size" => MAX_CACHE_FILE_SIZE]);
+
+			if ($data) {
+
+				$disable_cache = $this->host->get($this, "disable_cache");
+
+				if (!$disable_cache) {
+					if ($this->cache->put($local_filename, $data)) {
+						header("Location: " . $this->cache->getUrl($local_filename));
+						return;
+					}
+				}
+
+				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>";
+				}
+			}
+		}
+	}
+
+	private function rewrite_url_if_needed($url, $all_remote = false) {
+		/* we don't need to handle URLs where local cache already exists, tt-rss rewrites those automatically */
+		if (!$this->cache->exists(sha1($url))) {
+
+			$scheme = parse_url($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('<?xml encoding="UTF-8">' . $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 = $xpath->query("(//video|//picture)");
+
+			foreach ($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=\"<i class='material-icons'>extension</i> ".__('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 "&nbsp;<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 "&nbsp;<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"]);
+		$disable_cache = checkbox_to_sql_bool($_POST["disable_cache"]);
+
+		$this->host->set($this, "proxy_all", $proxy_all, false);
+		$this->host->set($this, "disable_cache", $disable_cache);
+
+		echo __("Configuration saved");
+	}
+
+	function api_version() {
+		return 2;
+	}
+}