host = $host; $this->cache_dir = CACHE_DIR . "/starred-images/"; if (!is_dir($this->cache_dir)) { mkdir($this->cache_dir); } if (is_dir($this->cache_dir)) { if (!is_writable($this->cache_dir)) chmod($this->cache_dir, 0777); if (is_writable($this->cache_dir)) { $host->add_hook($host::HOOK_UPDATE_TASK, $this); $host->add_hook($host::HOOK_HOUSE_KEEPING, $this); $host->add_hook($host::HOOK_SANITIZE, $this); $host->add_handler("public", "cache_starred_images_getimage", $this); } else { user_error("Starred cache directory is not writable.", E_USER_WARNING); } } else { user_error("Unable to create starred cache directory.", E_USER_WARNING); } } function cache_starred_images_getimage() { ob_end_clean(); $hash = basename($_REQUEST["hash"]); if ($hash) { $filename = $this->cache_dir . "/" . basename($hash); if (file_exists($filename)) { header("Content-Disposition: attachment; filename=\"$hash\""); send_local_file($filename); } else { header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found"); echo "File not found."; } } } /** * @SuppressWarnings(PHPMD.UnusedLocalVariable) */ function hook_house_keeping() { $files = glob($this->cache_dir . "/*.{png,mp4,status}", GLOB_BRACE); $last_article_id = 0; $article_exists = 1; foreach ($files as $file) { list ($article_id, $hash) = explode("-", basename($file)); if ($article_id != $last_article_id) { $last_article_id = $article_id; $sth = $this->pdo->prepare("SELECT id FROM ttrss_entries WHERE id = ?"); $sth->execute([$article_id]); $article_exists = $sth->fetch(); } if (!$article_exists) { unlink($file); } } } /** * @SuppressWarnings(PHPMD.UnusedFormalParameter) */ function hook_sanitize($doc, $site_url, $allowed_elements, $disallowed_attributes, $article_id) { $xpath = new DOMXpath($doc); if ($article_id) { $entries = $xpath->query('(//img[@src])|(//video/source[@src])'); foreach ($entries as $entry) { if ($entry->hasAttribute('src')) { $src = rewrite_relative_url($site_url, $entry->getAttribute('src')); $extension = $entry->tagName == 'source' ? '.mp4' : '.png'; $local_filename = $this->cache_dir . $article_id . "-" . sha1($src) . $extension; if (file_exists($local_filename)) { $entry->setAttribute("src", get_self_url_prefix() . "/public.php?op=cache_starred_images_getimage&method=image&hash=" . $article_id . "-" . sha1($src) . $extension); } } } } return $doc; } function hook_update_task() { $res = $this->pdo->query("SELECT content, ttrss_user_entries.owner_uid, link, site_url, ttrss_entries.id, plugin_data FROM ttrss_entries, ttrss_user_entries LEFT JOIN ttrss_feeds ON (ttrss_user_entries.feed_id = ttrss_feeds.id) WHERE ref_id = ttrss_entries.id AND marked = true AND (UPPER(content) LIKE '%pdo->prepare("UPDATE ttrss_entries SET plugin_data = ? WHERE id = ?"); while ($line = $res->fetch()) { if ($line["site_url"]) { $success = $this->cache_article_images($line["content"], $line["site_url"], $line["owner_uid"], $line["id"]); if ($success) { $plugin_data = "starred_cache_images,${line['owner_uid']}:" . $line["plugin_data"]; $usth->execute([$plugin_data, $line['id']]); } } } } /** * @SuppressWarnings(PHPMD.UnusedFormalParameter) */ function cache_article_images($content, $site_url, $owner_uid, $article_id) { libxml_use_internal_errors(true); $status_filename = $this->cache_dir . $article_id . "-" . sha1($site_url) . ".status"; Debug::log("status: $status_filename", Debug::$LOG_EXTENDED); if (file_exists($status_filename)) $status = json_decode(file_get_contents($status_filename), true); else $status = []; $status["attempt"] += 1; // only allow several download attempts for article if ($status["attempt"] > $this->max_cache_attempts) { Debug::log("too many attempts for $site_url", Debug::$LOG_VERBOSE); return; } if (!file_put_contents($status_filename, json_encode($status))) { user_error("unable to write status file: $status_filename", E_USER_WARNING); return; } $doc = new DOMDocument(); $doc->loadHTML('' . $content); $xpath = new DOMXPath($doc); $entries = $xpath->query('(//img[@src])|(//video/source[@src])'); $success = false; $has_images = false; foreach ($entries as $entry) { if ($entry->hasAttribute('src') && strpos($entry->getAttribute('src'), "data:") !== 0) { $has_images = true; $src = rewrite_relative_url($site_url, $entry->getAttribute('src')); $extension = $entry->tagName == 'source' ? '.mp4' : '.png'; $local_filename = $this->cache_dir . $article_id . "-" . sha1($src) . $extension; Debug::log("cache_images: downloading: $src to $local_filename", Debug::$LOG_VERBOSE); if (!file_exists($local_filename)) { $file_content = fetch_file_contents(["url" => $src, "max_size" => MAX_CACHE_FILE_SIZE]); if ($file_content) { if (strlen($file_content) > MIN_CACHE_FILE_SIZE) { file_put_contents($local_filename, $file_content); } $success = true; } } else { $success = true; } } } return $success || !$has_images; } function api_version() { return 2; } }