<?php


require_once('include/security.php');

function nuke_session() {
	unset($_SESSION['authenticated']);
	unset($_SESSION['account_id']);
	unset($_SESSION['uid']);
	unset($_SESSION['visitor_id']);
	unset($_SESSION['administrator']);
	unset($_SESSION['cid']);
	unset($_SESSION['theme']);
	unset($_SESSION['mobile-theme']);
	unset($_SESSION['page_flags']);
	unset($_SESSION['submanage']);
	unset($_SESSION['my_url']);
	unset($_SESSION['my_address']);
	unset($_SESSION['addr']);
	unset($_SESSION['return_url']);
}

/**
 * Verify login credentials
 *
 * Returns account record on success, null on failure
 *
 */

function account_verify_password($email,$pass) {
	$r = q("select * from account where account_email = '%s'",
		dbesc($email)
	);
	if(! ($r && count($r)))
		return null;
	foreach($r as $record) {
		if(($record['account_flags'] == ACCOUNT_OK) || ($record['account_flags'] == ACCOUNT_UNVERIFIED)
			&& (hash('whirlpool',$record['account_salt'] . $pass) === $record['account_password'])) {
			return $record;
		}
	}
	return null;
}


// login/logout 


if((isset($_SESSION)) && (x($_SESSION,'authenticated')) && ((! (x($_POST,'auth-params'))) || ($_POST['auth-params'] !== 'login'))) {

	if(((x($_POST,'auth-params')) && ($_POST['auth-params'] === 'logout')) || ($a->module === 'logout')) {
	
		// process logout request
		call_hooks("logging_out");
		nuke_session();
		info( t('Logged out.') . EOL);
		goaway(z_root());
	}

	if(x($_SESSION,'visitor_id') && (! x($_SESSION,'uid'))) {
		$r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
			intval($_SESSION['visitor_id'])
		);
		if(count($r)) {
			$a->contact = $r[0];
		}
	}

	if(x($_SESSION,'uid') || x($_SESSION,'account_id')) {

		// already logged in user returning

		$check = get_config('system','paranoia');
		// extra paranoia - if the IP changed, log them out
		if($check && ($_SESSION['addr'] != $_SERVER['REMOTE_ADDR'])) {
			logger('Session address changed. Paranoid setting in effect, blocking session. ' 
				. $_SESSION['addr'] . ' != ' . $_SERVER['REMOTE_ADDR']);
			nuke_session();
			goaway(z_root());
		}

		if(x($_SESSION,'account_id')) {
			$r = q("select * from account where account_id = %d limit 1",
				intval($_SESSION['account_id'])
			);
			if(count($r) && (($r[0]['account_flags'] == ACCOUNT_OK) || ($r[0]['account_flags'] == ACCOUNT_UNVERIFIED))) {
				get_app()->account = $r[0];
				authenticate_success($r[0]);
			}
			else {
				$_SESSION['account_id'] = 0;
				nuke_session();
				goaway(z_root());
			}
		}
		else {
				$r = q("SELECT `user`.*, `user`.`pubkey` as `upubkey`, `user`.`prvkey` as `uprvkey` 
					FROM `user` WHERE `uid` = %d AND `blocked` = 0 
					AND `account_expired` = 0 AND `verified` = 1 LIMIT 1",
					intval($_SESSION['uid'])
				);
		}

		if(! count($r)) {
			nuke_session();
			goaway(z_root());
		}

		authenticate_success($r[0]);
	}
}
else {

	if(isset($_SESSION)) {
		nuke_session();
	}

	if((x($_POST,'password')) && strlen($_POST['password']))
		$encrypted = hash('whirlpool',trim($_POST['password']));

	if((x($_POST,'auth-params')) && $_POST['auth-params'] === 'login') {

		$record = null;

		$addon_auth = array(
			'username' => trim($_POST['username']), 
			'password' => trim($_POST['password']),
			'authenticated' => 0,
			'user_record' => null
		);

		/**
		 *
		 * A plugin indicates successful login by setting 'authenticated' to non-zero value and returning a user record
		 * Plugins should never set 'authenticated' except to indicate success - as hooks may be chained
		 * and later plugins should not interfere with an earlier one that succeeded.
		 *
		 */

		call_hooks('authenticate', $addon_auth);

		if(($addon_auth['authenticated']) && (count($addon_auth['user_record']))) {
			$record = $addon_auth['user_record'];
		}
		else {

			$record = get_app()->account = account_verify_password($_POST['username'],$_POST['password']);

			if(get_app()->account) {
				$_SESSION['account_id'] = get_app()->account['account_id'];
			}
			else {
				notice( t('Failed authentication') . EOL);
			}

			logger('authenticate: ' . print_r(get_app()->account,true));


			// process normal login request

//			$r = q("SELECT `user`.*, `user`.`pubkey` as `upubkey`, `user`.`prvkey` as `uprvkey`  
//				FROM `user` WHERE ( `email` = '%s' OR `nickname` = '%s' ) 
//				AND `password` = '%s' AND `blocked` = 0 AND `account_expired` = 0 AND `verified` = 1 LIMIT 1",
//				dbesc(trim($_POST['username'])),
//				dbesc(trim($_POST['username'])),
//				dbesc($encrypted)
//			);
//			if(count($r))
//				$record = $r[0];
		}

		if((! $record) || (! count($record))) {
			logger('authenticate: failed login attempt: ' . notags(trim($_POST['username'])) . ' from IP ' . $_SERVER['REMOTE_ADDR']); 
			notice( t('Login failed.') . EOL );
			goaway(z_root());
  		}

		// if we haven't failed up this point, log them in.

		authenticate_success($record, true, true);
	}
}