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); } 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 image() { ob_end_clean(); $hash = basename($_REQUEST["hash"]); if ($hash) { $filename = $this->cache_dir . "/" . $hash . '.png'; if (file_exists($filename)) { /* See if we can use X-Sendfile */ $xsendfile = false; if (function_exists('apache_get_modules') && array_search('mod_xsendfile', apache_get_modules())) $xsendfile = true; if ($xsendfile) { header("X-Sendfile: $filename"); header("Content-type: application/octet-stream"); header('Content-Disposition: attachment; filename="' . basename($filename) . '"'); } else { header("Content-type: image/png"); $stamp = gmdate("D, d M Y H:i:s", filemtime($filename)). " GMT"; header("Last-Modified: $stamp", true); readfile($filename); } } else { header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found"); echo "File not found."; } } } function hook_house_keeping() { $files = glob($this->cache_dir . "/*.png"); $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; $article_id = db_escape_string($article_id); $result = db_query("SELECT id FROM ttrss_entries WHERE id = " . $article_id); $article_exists = db_num_rows($result) > 0; } if (!$article_exists) { unlink($file); } } } function hook_sanitize($doc, $site_url, $allowed_elements, $disallowed_attributes, $article_id) { $xpath = new DOMXpath($doc); if ($article_id) { $entries = $xpath->query('(//img[@src])'); foreach ($entries as $entry) { if ($entry->hasAttribute('src')) { $src = rewrite_relative_url($site_url, $entry->getAttribute('src')); $local_filename = $this->cache_dir . $article_id . "-" . sha1($src) . ".png"; if (file_exists($local_filename)) { $entry->setAttribute("src", get_self_url_prefix() . "/backend.php?op=pluginhandler&plugin=cache_starred_images&method=image&hash=" . $article_id . "-" . sha1($src)); } } } } return $doc; } function hook_update_task() { $result = db_query("SELECT content, ttrss_user_entries.owner_uid, link, site_url, ttrss_entries.id, plugin_data FROM ttrss_entries, ttrss_user_entries LEFT JOIN ttrss_feeds ON (ttrss_user_entries.feed_id = ttrss_feeds.id) WHERE ref_id = ttrss_entries.id AND marked = true AND UPPER(content) LIKE '%cache_article_images($line["content"], $line["site_url"], $line["owner_uid"], $line["id"]); if ($success) { $plugin_data = db_escape_string("starred_cache_images,${line['owner_uid']}:" . $line["plugin_data"]); db_query("UPDATE ttrss_entries SET plugin_data = '$plugin_data' WHERE id = " . $line["id"]); } } } } function cache_article_images($content, $site_url, $owner_uid, $article_id) { libxml_use_internal_errors(true); $charset_hack = ' '; $doc = new DOMDocument(); $doc->loadHTML($charset_hack . $content); $xpath = new DOMXPath($doc); $entries = $xpath->query('(//img[@src])'); $success = false; $has_images = false; foreach ($entries as $entry) { if ($entry->hasAttribute('src')) { $has_images = true; $src = rewrite_relative_url($site_url, $entry->getAttribute('src')); $local_filename = $this->cache_dir . $article_id . "-" . sha1($src) . ".png"; //_debug("cache_images: downloading: $src to $local_filename"); if (!file_exists($local_filename)) { $file_content = fetch_file_contents($src); if ($file_content && strlen($file_content) > 0) { file_put_contents($local_filename, $file_content); $success = true; } } else { $success = true; } } } return $success || !$has_images; } function api_version() { return 2; } } ?>