host = $host; $this->cache = new DiskCache("images"); $host->add_hook($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; } $local_filename = sha1($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 (!$disable_cache && strlen($data) > MIN_CACHE_FILE_SIZE) { 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 "

Proxy request failed.

"; print "

Fetch error $fetch_last_error ($fetch_last_error_code)

"; print "

URL: $url

"; print ""; } } } } private 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 $url; } } } /* we don't need to handle URLs where local cache already exists, tt-rss rewrites those automatically */ if (!$this->cache->exists(sha1($url))) { return get_self_url_prefix() . "/public.php?op=pluginhandler&plugin=af_zz_imgproxy&pmethod=imgproxy&url=" . urlencode($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 = $xpath->query("(//video|//picture)"); foreach ($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 "
extension ".__('Image proxy settings (af_zz_imgproxy)')."\">"; print "
"; print ""; 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 " 
"; $disable_cache = $this->host->get($this, "disable_cache"); print_checkbox("disable_cache", $disable_cache); print " "; print "

"; print_button("submit", __("Save")); print "

"; print "
"; } 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; } }