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<?php
/**
* This file is part of RSS-Bridge, a PHP project capable of generating RSS and
* Atom feeds for websites that don't have one.
*
* For the full license information, please view the UNLICENSE file distributed
* with this source code.
*
* @package Core
* @license http://unlicense.org/ UNLICENSE
* @link https://github.com/rss-bridge/rss-bridge
*/
class DisplayAction extends ActionAbstract {
public function execute() {
$bridge = array_key_exists('bridge', $this->userData) ? $this->userData['bridge'] : null;
$format = $this->userData['format']
or returnClientError('You must specify a format!');
$bridgeFac = new \BridgeFactory();
$bridgeFac->setWorkingDir(PATH_LIB_BRIDGES);
// whitelist control
if(!$bridgeFac->isWhitelisted($bridge)) {
throw new \Exception('This bridge is not whitelisted', 401);
die;
}
// Data retrieval
$bridge = $bridgeFac->create($bridge);
$noproxy = array_key_exists('_noproxy', $this->userData)
&& filter_var($this->userData['_noproxy'], FILTER_VALIDATE_BOOLEAN);
if(defined('PROXY_URL') && PROXY_BYBRIDGE && $noproxy) {
define('NOPROXY', true);
}
// Cache timeout
$cache_timeout = -1;
if(array_key_exists('_cache_timeout', $this->userData)) {
if(!CUSTOM_CACHE_TIMEOUT) {
unset($this->userData['_cache_timeout']);
$uri = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH) . '?' . http_build_query($this->userData);
header('Location: ' . $uri, true, 301);
die();
}
$cache_timeout = filter_var($this->userData['_cache_timeout'], FILTER_VALIDATE_INT);
} else {
$cache_timeout = $bridge->getCacheTimeout();
}
// Remove parameters that don't concern bridges
$bridge_params = array_diff_key(
$this->userData,
array_fill_keys(
array(
'action',
'bridge',
'format',
'_noproxy',
'_cache_timeout',
'_error_time'
), '')
);
// Remove parameters that don't concern caches
$cache_params = array_diff_key(
$this->userData,
array_fill_keys(
array(
'action',
'format',
'_noproxy',
'_cache_timeout',
'_error_time'
), '')
);
// Initialize cache
$cacheFac = new CacheFactory();
$cacheFac->setWorkingDir(PATH_LIB_CACHES);
$cache = $cacheFac->create(Configuration::getConfig('cache', 'type'));
$cache->setScope('');
$cache->purgeCache(86400); // 24 hours
$cache->setKey($cache_params);
$items = array();
$infos = array();
$mtime = $cache->getTime();
if($mtime !== false
&& (time() - $cache_timeout < $mtime)
&& !Debug::isEnabled()) { // Load cached data
// Send "Not Modified" response if client supports it
// Implementation based on https://stackoverflow.com/a/10847262
if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
$stime = strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']);
if($mtime <= $stime) { // Cached data is older or same
header('Last-Modified: ' . gmdate('D, d M Y H:i:s ', $mtime) . 'GMT', true, 304);
die();
}
}
$cached = $cache->loadData();
if(isset($cached['items']) && isset($cached['extraInfos'])) {
foreach($cached['items'] as $item) {
$items[] = new \FeedItem($item);
}
$infos = $cached['extraInfos'];
}
} else { // Collect new data
try {
$bridge->setDatas($bridge_params);
$bridge->collectData();
$items = $bridge->getItems();
// Transform "legacy" items to FeedItems if necessary.
// Remove this code when support for "legacy" items ends!
if(isset($items[0]) && is_array($items[0])) {
$feedItems = array();
foreach($items as $item) {
$feedItems[] = new \FeedItem($item);
}
$items = $feedItems;
}
$infos = array(
'name' => $bridge->getName(),
'uri' => $bridge->getURI(),
'icon' => $bridge->getIcon()
);
} catch(Error $e) {
error_log($e);
$item = new \FeedItem();
// Create "new" error message every 24 hours
$this->userData['_error_time'] = urlencode((int)(time() / 86400));
// Error 0 is a special case (i.e. "trying to get property of non-object")
if($e->getCode() === 0) {
$item->setTitle(
'Bridge encountered an unexpected situation! ('
. $this->userData['_error_time']
. ')'
);
} else {
$item->setTitle(
'Bridge returned error '
. $e->getCode()
. '! ('
. $this->userData['_error_time']
. ')'
);
}
$item->setURI(
(isset($_SERVER['REQUEST_URI']) ? parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH) : '')
. '?'
. http_build_query($this->userData)
);
$item->setTimestamp(time());
$item->setContent(buildBridgeException($e, $bridge));
$items[] = $item;
} catch(Exception $e) {
error_log($e);
$item = new \FeedItem();
// Create "new" error message every 24 hours
$this->userData['_error_time'] = urlencode((int)(time() / 86400));
$item->setURI(
(isset($_SERVER['REQUEST_URI']) ? parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH) : '')
. '?'
. http_build_query($this->userData)
);
$item->setTitle(
'Bridge returned error '
. $e->getCode()
. '! ('
. $this->userData['_error_time']
. ')'
);
$item->setTimestamp(time());
$item->setContent(buildBridgeException($e, $bridge));
$items[] = $item;
}
// Store data in cache
$cache->saveData(array(
'items' => array_map(function($i){ return $i->toArray(); }, $items),
'extraInfos' => $infos
));
}
// Data transformation
try {
$formatFac = new FormatFactory();
$formatFac->setWorkingDir(PATH_LIB_FORMATS);
$format = $formatFac->create($format);
$format->setItems($items);
$format->setExtraInfos($infos);
$format->setLastModified($cache->getTime());
$format->display();
} catch(Error $e) {
error_log($e);
header('Content-Type: text/html', true, $e->getCode());
die(buildTransformException($e, $bridge));
} catch(Exception $e) {
error_log($e);
header('Content-Type: text/html', true, $e->getCode());
die(buildTransformException($e, $bridge));
}
}
}
|
