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<?php
class Cache_Starred_Images extends Plugin {
private $host;
private $cache_dir;
function about() {
return array(1.0,
"Automatically cache images in Starred articles",
"fox",
true);
}
function init($host) {
$this->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)) {
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() {
$hash = basename($_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: $stamp", true);
ob_clean(); // discard any data in the output buffer (if possible)
flush(); // flush headers (if possible)
readfile($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() {
$result = db_query("SELECT content, ttrss_user_entries.owner_uid, link, site_url, ttrss_entries.id, plugin_data
FROM ttrss_entries, ttrss_user_entries LEFT JOIN ttrss_feeds ON
(ttrss_user_entries.feed_id = ttrss_feeds.id)
WHERE ref_id = ttrss_entries.id AND
marked = true AND
UPPER(content) LIKE '%<IMG%' AND
site_url != '' AND
plugin_data NOT LIKE '%starred_cache_images%'
ORDER BY ".sql_random_function()." LIMIT 100");
while ($line = db_fetch_assoc($result)) {
if ($line["site_url"]) {
$success = $this->cache_article_images($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 = '<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
</head>';
$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;
}
}
?>
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