<?php
if (!function_exists('json_decode')) {
	require_once('JSON.php');
	function json_decode($var) {
		$JSON = new Services_JSON;
		return (array)($JSON->decode($var));
	}
}

if (!function_exists('json_encode')) {
	require_once('JSON.php');
	function json_encode($var) {
		$JSON = new Services_JSON;
		return $JSON->encodeUnsafe($var);
	}
}

//<Auto-loading>
function classAutoloader($class) {
	if (strpos($class, 'FreshRSS') === 0) {
		$components = explode('_', $class);
		switch (count($components)) {
			case 1:
				include(APP_PATH . '/' . $components[0] . '.php');
				return;
			case 2:
				include(APP_PATH . '/Models/' . $components[1] . '.php');
				return;
			case 3:	//Controllers, Exceptions
				@include(APP_PATH . '/' . $components[2] . 's/' . $components[1] . $components[2] . '.php');
				return;
		}
	} elseif (strpos($class, 'Minz') === 0) {
		include(LIB_PATH . '/' . str_replace('_', '/', $class) . '.php');
	} elseif (strpos($class, 'SimplePie') === 0) {
		include(LIB_PATH . '/SimplePie/' . str_replace('_', '/', $class) . '.php');
	}
}

spl_autoload_register('classAutoloader');
//</Auto-loading>

function checkUrl($url) {
	if (empty ($url)) {
		return '';
	}
	if (!preg_match ('#^https?://#i', $url)) {
		$url = 'http://' . $url;
	}
	if (filter_var($url, FILTER_VALIDATE_URL) ||
		(version_compare(PHP_VERSION, '5.3.3', '<') && (strpos($url, '-') > 0) &&	//PHP bug #51192
		 ($url === filter_var($url, FILTER_SANITIZE_URL)))) {
		return $url;
	} else {
		return false;
	}
}

function formatNumber($n, $precision = 0) {
	return str_replace(' ', ' ',	//Espace insécable	//TODO: remplacer par une espace _fine_ insécable
		number_format($n, $precision, '.', ' '));	//number_format does not seem to be Unicode-compatible
}

function formatBytes($bytes, $precision = 2, $system = 'IEC') {
	if ($system === 'IEC') {
		$base = 1024;
		$units = array('B', 'KiB', 'MiB', 'GiB', 'TiB');
	} elseif ($system === 'SI') {
		$base = 1000;
		$units = array('B', 'KB', 'MB', 'GB', 'TB');
	}
	$bytes = max(intval($bytes), 0);
	$pow = $bytes === 0 ? 0 : floor(log($bytes) / log($base));
	$pow = min($pow, count($units) - 1);
	$bytes /= pow($base, $pow);
	return formatNumber($bytes, $precision) . ' ' . $units[$pow];
}

function timestamptodate ($t, $hour = true) {
	$month = Minz_Translate::t (date('M', $t));
	if ($hour) {
		$date = Minz_Translate::t ('format_date_hour', $month);
	} else {
		$date = Minz_Translate::t ('format_date', $month);
	}

	return @date ($date, $t);
}

function html_only_entity_decode($text) {
	static $htmlEntitiesOnly = null;
	if ($htmlEntitiesOnly === null) {
		if (version_compare(PHP_VERSION, '5.3.4') >= 0) {
			$htmlEntitiesOnly = array_flip(array_diff(
				get_html_translation_table(HTML_ENTITIES, ENT_NOQUOTES, 'UTF-8'),	//Decode HTML entities
				get_html_translation_table(HTML_SPECIALCHARS, ENT_NOQUOTES, 'UTF-8')	//Preserve XML entities
			));
		} else {
			$htmlEntitiesOnly = array_map('utf8_encode', array_flip(array_diff(
				get_html_translation_table(HTML_ENTITIES, ENT_NOQUOTES),	//Decode HTML entities
				get_html_translation_table(HTML_SPECIALCHARS, ENT_NOQUOTES)	//Preserve XML entities
			)));
		}
	}
	return strtr($text, $htmlEntitiesOnly);
}

function customSimplePie() {
	$simplePie = new SimplePie();
	$simplePie->set_useragent(Minz_Translate::t('freshrss') . '/' . FRESHRSS_VERSION . ' (' . PHP_OS . '; ' . FRESHRSS_WEBSITE . ') ' . SIMPLEPIE_NAME . '/' . SIMPLEPIE_VERSION);
	$simplePie->set_cache_location(CACHE_PATH);
	$simplePie->set_cache_duration(800);
	$simplePie->strip_htmltags(array(
		'base', 'blink', 'body', 'doctype', 'embed',
		'font', 'form', 'frame', 'frameset', 'html',
		'link', 'input', 'marquee', 'meta', 'noscript',
		'object', 'param', 'plaintext', 'script', 'style',
	));
	$simplePie->strip_attributes(array_merge($simplePie->strip_attributes, array(
		'autoplay', 'onload', 'onunload', 'onclick', 'ondblclick', 'onmousedown', 'onmouseup',
		'onmouseover', 'onmousemove', 'onmouseout', 'onfocus', 'onblur',
		'onkeypress', 'onkeydown', 'onkeyup', 'onselect', 'onchange', 'seamless')));
	$simplePie->add_attributes(array(
		'img' => array('lazyload' => '', 'postpone' => ''),	//http://www.w3.org/TR/resource-priorities/
		'audio' => array('lazyload' => '', 'postpone' => '', 'preload' => 'none'),
		'iframe' => array('lazyload' => '', 'postpone' => '', 'sandbox' => 'allow-scripts allow-same-origin'),
		'video' => array('lazyload' => '', 'postpone' => '', 'preload' => 'none'),
	));
	$simplePie->set_url_replacements(array(
		'a' => 'href',
		'area' => 'href',
		'audio' => 'src',
		'blockquote' => 'cite',
		'del' => 'cite',
		'form' => 'action',
		'iframe' => 'src',
		'img' => array(
			'longdesc',
			'src'
		),
		'input' => 'src',
		'ins' => 'cite',
		'q' => 'cite',
		'source' => 'src',
		'track' => 'src',
		'video' => array(
			'poster',
			'src',
		),
	));
	return $simplePie;
}

function sanitizeHTML($data, $base = '') {
	static $simplePie = null;
	if ($simplePie == null) {
		$simplePie = customSimplePie();
		$simplePie->init();
	}
	return html_only_entity_decode($simplePie->sanitize->sanitize($data, SIMPLEPIE_CONSTRUCT_HTML, $base));
}

/* permet de récupérer le contenu d'un article pour un flux qui n'est pas complet */
function get_content_by_parsing ($url, $path) {
	require_once (LIB_PATH . '/lib_phpQuery.php');

	syslog(LOG_INFO, 'FreshRSS GET ' . $url);
	$html = file_get_contents ($url);

	if ($html) {
		$doc = phpQuery::newDocument ($html);
		$content = $doc->find ($path);
		return sanitizeHTML($content->__toString(), $url);
	} else {
		throw new Exception ();
	}
}

/**
 * Add support of image lazy loading
 * Move content from src attribute to data-original
 * @param content is the text we want to parse
 */
function lazyimg($content) {
	return preg_replace(
		'/<((?:img|iframe)[^>]+?)src=[\'"]([^"\']+)[\'"]([^>]*)>/i',
		'<$1src="' . Minz_Url::display('/themes/icons/grey.gif') . '" data-original="$2"$3>',
		$content
	);
}

function uTimeString() {
	$t = @gettimeofday();
	return $t['sec'] . str_pad($t['usec'], 6, '0');
}

function uSecString() {
	$t = @gettimeofday();
	return str_pad($t['usec'], 6, '0');
}

function invalidateHttpCache() {
	Minz_Session::_param('touch', uTimeString());
	return touch(LOG_PATH . '/' . Minz_Session::param('currentUser', '_') . '.log');
}

function usernameFromPath($userPath) {
	if (preg_match('%/([A-Za-z0-9]{1,16})_user\.php$%', $userPath, $matches)) {
		return $matches[1];
	} else {
		return '';
	}
}

function listUsers() {
	return array_map('usernameFromPath', glob(DATA_PATH . '/*_user.php'));
}

function httpAuthUser() {
	return isset($_SERVER['REMOTE_USER']) ? $_SERVER['REMOTE_USER'] : '';
}

function cryptAvailable() {
	if (version_compare(PHP_VERSION, '5.3.3', '>=')) {
		try {
			$hash = '$2y$04$usesomesillystringfore7hnbRJHxXVLeakoG8K30oukPsA.ztMG';
			return $hash === @crypt('password', $hash);
		} catch (Exception $e) {
		}
	}
	return false;
}

function is_referer_from_same_domain() {
	if (empty($_SERVER['HTTP_REFERER'])) {
		return false;
	}
	$host = parse_url(((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on') ? 'https://' : 'http://') .
		(empty($_SERVER['HTTP_HOST']) ? $_SERVER['SERVER_NAME'] : $_SERVER['HTTP_HOST']));
	$referer = parse_url($_SERVER['HTTP_REFERER']);
	if (empty($host['scheme']) || empty($referer['scheme']) || $host['scheme'] !== $referer['scheme'] ||
	    empty($host['host']) || empty($referer['host']) || $host['host'] !== $referer['host']) {
		return false;
	}
	return (isset($host['port']) ? $host['port'] : 0) === (isset($referer['port']) ? $referer['port'] : 0);
}