<?php
/**
 * [Discuz!] (C)2001-2099 Discuz! Team
 * This is NOT a freeware, use is subject to license terms
 * https://license.discuz.vip
 */

if(!defined('IN_DISCUZ')) {
	exit('Access Denied');
}

function getuploadconfig($uid = 0, $fid = 0, $limit = true) {
	global $_G;

	$notallow = $config = [];
	$config['limit'] = 0;
	$uid = !empty($uid) ? intval($uid) : $_G['uid'];
	$authkey = $_G['config']['security']['authkey'];
	$config['hash'] = md5(substr(md5($authkey), 8).$uid);

	$imageexts = ['jpg', 'jpeg', 'gif', 'png', 'bmp', 'webp'];
	$forumattachextensions = '';
	$fid = intval($fid);
	if($fid) {
		$forum = $fid != $_G['fid'] ? table_forum_forum::t()->fetch_info_by_fid($fid) : $_G['forum'];
		$levelinfo = table_forum_grouplevel::t()->fetch($forum['level']);
		if($forum['status'] == 3 && $forum['level'] && $postpolicy = $levelinfo['postpolicy']) {
			$postpolicy = dunserialize($postpolicy);
			$forumattachextensions = $postpolicy['attachextensions'];
		} else {
			$forumattachextensions = $forum['attachextensions'];
		}
	}
	$extendtype = '';

	loadcache('attachtype');
	$fid = isset($_G['cache']['attachtype'][$fid]) ? $fid : 0;
	$filter = [];
	if(isset($_G['cache']['attachtype'][$fid]) && is_array($_G['cache']['attachtype'][$fid])) {
		foreach($_G['cache']['attachtype'][$fid] as $extension => $maxsize) {
			if($maxsize == 0) {
				$notallow[] = $extension;
			} else {
				$filter[] = "'$extension':$maxsize";
			}
		}
	}
	if(!empty($filter)) {
		$config['filtertype'] = '{'.implode(',', $filter).'}';
	}
	$_G['group']['attachextensions'] = !$forumattachextensions ? $_G['group']['attachextensions'] : $forumattachextensions;

	$config['imageexts'] = ['ext' => '', 'depict' => 'Image File'];
	$config['attachexts'] = ['ext' => '*.*', 'depict' => 'All Support Formats'];

	if($_G['group']['attachextensions'] !== '') {
		$_G['group']['attachextensions'] = str_replace(' ', '', $_G['group']['attachextensions']);
		$exts = explode(',', $_G['group']['attachextensions']);

		$imagext = filterexts(array_intersect($imageexts, $exts), $notallow);
		$config['imageexts']['ext'] = !empty($imagext) ? '*.'.implode(';*.', $imagext) : '';
		$exts = filterexts($exts, $notallow);
		$config['attachexts']['ext'] = !empty($exts) ? '*.'.implode(';*.', $exts) : '';
	} else {
		$imageexts = filterexts($imageexts, $notallow);
		$config['imageexts']['ext'] = !empty($imageexts) ? '*.'.implode(';*.', $imageexts) : '';
	}
	$config['max'] = 0;
	if(!empty($_G['group']['maxattachsize'])) {
		$config['max'] = intval($_G['group']['maxattachsize']);
	} else {
		$config['max'] = getmaxupload();
		$unit = strtolower(substr($config['max'], -1, 1));
		$config['max'] = intval($config['max']);
		if($unit == 'k') {
			$config['max'] = $config['max'] * 1024;
		} elseif($unit == 'm') {
			$config['max'] = $config['max'] * 1024 * 1024;
		} elseif($unit == 'g') {
			$config['max'] = $config['max'] * 1024 * 1024 * 1024;
		}
	}
	$config['max'] = $config['max'] / 1024;

	if($limit) {
		if($_G['group']['maxattachnum']) {
			$todayattachs = getuserprofile('todayattachs');
			$config['maxattachnum'] = (int)$_G['group']['maxattachnum'] - (int)$todayattachs;
			$config['maxattachnum'] = $config['maxattachnum'] > 0 ? $config['maxattachnum'] : -1;
			$config['limit'] = $config['maxattachnum'] > 0 ? $config['maxattachnum'] : 0;
		}
		if($_G['group']['maxsizeperday']) {
			$todayattachsize = (int)getuserprofile('todayattachsize');
			$config['maxsizeperday'] = $_G['group']['maxsizeperday'] - $todayattachsize;
			$config['maxsizeperday'] = $config['maxsizeperday'] > 0 ? $config['maxsizeperday'] : -1;
		}
	}
	return $config;
}

function filterexts($needle, $haystack) {

	foreach($needle as $key => $value) {
		if(in_array($value, $haystack)) {
			unset($needle[$key]);
		}
	}
	return $needle;
}

function getmaxupload() {
	$sizeconv = ['B' => 1, 'KB' => 1024, 'MB' => 1048576, 'GB' => 1073741824];
	$sizes = [];
	$sizes[] = ini_get('upload_max_filesize');
	$sizes[] = ini_get('post_max_size');
	$sizes[] = ini_get('memory_limit');
	if(intval($sizes[1]) === 0) {
		unset($sizes[1]);
	}
	if(intval($sizes[2]) === -1) {
		unset($sizes[2]);
	}
	$sizes = preg_replace_callback(
		'/^(\-?\d+)([KMG]?)$/i',
		function($arg) use ($sizeconv) {
			return (intval($arg[1]) * $sizeconv[strtoupper($arg[2]).'B']).'|'.strtoupper($arg[0]);
		},
		$sizes
	);
	natsort($sizes);
	$output = explode('|', current($sizes));
	if(!empty($output[1])) {
		return $output[1];
	} else {
		return ini_get('upload_max_filesize');
	}
}