S2OJ/web/app/controllers/user_msg.php

<?php
	if ($myUser == null) {
		redirectToLogin();
	}

	function handleMsgPost() {
			global $myUser;
			if (!isset($_POST['receiver'])) {
				return 'fail';
			}
			if (!isset($_POST['message'])) {
				return 'fail';
			}
			if (0 > strlen($_POST['message']) || strlen($_POST['message']) > 65535) {
				return 'fail';
			}
			$receiver = $_POST['receiver'];
			$esc_message = DB::escape($_POST['message']);
			$sender = $myUser['username'];

			if (!validateUsername($receiver) || !queryUser($receiver)) {
				return 'fail';
			}

			DB::query("insert into user_msg (sender, receiver, message, send_time) values ('$sender', '$receiver', '$esc_message', now())");
			return "ok";
	}

	function getConversations() {
			global $myUser;
			$username = $myUser['username'];
			$result = DB::query( "select * from user_msg where sender = '$username' or receiver = '$username' order by send_time DESC" );
			$ret = array();
			while ($msg = DB::fetch($result)) {
					if ($msg['sender'] !== $username) {
							if (isset($ret[$msg['sender']])) {
									$ret[$msg['sender']][1] |= ($msg['read_time'] == null);
									continue;
							}
							$ret[$msg['sender']] = array($msg['send_time'], ($msg['read_time'] == null));
					} else {
							if (isset($ret[$msg['receiver']])) continue;
							$ret[$msg['receiver']] = array($msg['send_time'], 0);
					}
			}
			$res = [];
			foreach ($ret as $name => $con) {
				$res[] = [$con[0], $con[1], $name];
			}
			usort($res, function($a, $b) { return -strcmp($a[0], $b[0]); });
			return json_encode($res);
	}

	function getHistory() {
		global $myUser;
		$username = $myUser['username'];
		if (!isset($_GET['conversationName']) || !validateUsername($_GET['conversationName'])) {
			return '[]';
		}
		if (!isset($_GET['pageNumber']) || !validateUInt($_GET['pageNumber'])) {
			return '[]';
		}

		$conversationName = $_GET['conversationName'];
		$pageNumber = ($_GET['pageNumber'] - 1) * 10;
		DB::query("update user_msg set read_time = now() where sender = '$conversationName'  and  receiver = '$username' and read_time is null");

		$result = DB::query("select * from user_msg where (sender = '$username' and receiver = '$conversationName') or (sender = '$conversationName' and receiver = '$username')	order by send_time DESC limit $pageNumber, 11");
		$ret = array();
		while ($msg = DB::fetch($result)) {
			$ret[] = array($msg['message'], $msg['send_time'], $msg['read_time'], $msg['id'], ($msg['sender'] == $username));
		}
		return json_encode($ret);
	}

/*
function deleteMsg($msgId) {
    return 1;
    $str = <<<EOD
select * from user_msg
where id = $msgId
and read_time is null
EOD;
    $result = DB::query($str);
    if (DB::fetch($result)) {
        $str = <<<EOD
delete from user_msg
where id = $msgId
EOD;
        DB::query($str);
        return 1;
    }
    return 0;
}
*/

	if (isset($_POST['user_msg'])) {
			die(handleMsgPost());
	} elseif (isset($_GET['getConversations'])) {
			die(getConversations());
	} elseif (isset($_GET['getHistory'])) {
			die(getHistory());
	} 
?>

<?php echoUOJPageHeader('私信') ?>

<h1 class="page-header">私信</h1>

<div id="conversations">
</div>

<div id="history" style="display:none">
	<div class="panel panel-primary">
		<div class="panel-heading">
			<button type="button" id="goBack" class="btn btn-info btn-xs" style="position:absolute">返回</button>
			<div id="conversation-name" class="text-center"></div>
		</div>
		<div class="panel-body">
			<ul class="pager top-buffer-no">
				<li class="previous"><a href="#" id="pageLeft">&larr; 更早的消息</a></li>
				<li class="text-center" id="pageShow" style="line-height:32px"></li>
				<li class="next"><a href="#" id="pageRight">更新的消息 &rarr;</a></li>
			</ul>
			<div id="history-list" style="min-height: 200px;">
			</div>
			<ul class="pager bot-buffer-no">
				<li class="previous"><a href="#history" id="pageLeft2">&larr; 更早的消息</a></li>
				<li class="next"><a href="#history" id="pageRight2">更新的消息 &rarr;</a></li>
			</ul>
			<hr />
			<form id="form-message">
				<div class="form-group" id="form-group-message">
					<textarea id="input-message" class="form-control"></textarea>
					<span id="help-message" class="help-block"></span>
				</div>
				<div class="text-right">
					<button type="submit" id="message-submit" class="btn btn-info btn-md">发送</button>
				</div>
			</form>
		</div>
	</div>
</div>

<script type="text/javascript">
$(document).ready(function() {
	$.ajaxSetup({async:false});
	refreshConversations();
	<?php if (isset($_GET['enter'])): ?>
	enterConversation("<?= $_GET['enter'] ?>");
	<?php endif ?>
});
</script>

<script type="text/javascript">
function addButton(conversationName, send_time, type) {
	$("#conversations").append(
		'<div class="row top-buffer-sm">' +
			'<div class="col-sm-3">' +
				'<button type="button" class="btn btn-' + ( type ? 'warning' : 'primary' ) + ' btn-block" ' +
					'onclick="enterConversation(\'' + conversationName + '\')">' +
					conversationName +
				'</button>' +
			'</div>' +
			'<div class="col-sm-9" style="line-height:34px">' +
				'最后发送时间：' + send_time +
			'</div>' +
		'</div>'
	);
}

function addBubble(content, send_time, read_time, msgId, conversation, page, type) {
	$("#history-list").append(
			'<div style=' + (type ? "margin-left:0%;margin-right:20%;" : "margin-left:20%;margin-right:0%;") + '>' +
				'<div class="panel panel-info">' +
					'<div class="panel-body" style="background:#afeeee; word-break: break-all">' +
						'<div style="white-space:pre-wrap">' +
							htmlspecialchars(content) +
						'</div>' +
					'</div>' +
					'<div>' +
						'<div class="row">' +
							'<div class="col-sm-6">' +
								'发送时间：' + send_time +
							'</div>' +
							'<div class="col-sm-6 text-right">' +
								 '查看时间：' + (read_time == null ? '<strong>未查看</strong>' : read_time) +
							'</div>' +
						'</div>' +
					'</div>' +
				'</div>' +
			'</div>'
	);
}

function submitMessagePost(conversationName) {
		if ($('#input-message').val().length == 0  ||  $('#input-message').val().length >= 65536) {
				$('#help-message').text('私信长度必须在1~65535之间。');
				$('#form-group-message').addClass('has-error');
				return;
		}
		$('#help-message').text('');
		$('#form-group-message').removeClass('has-error');

		$.post('/user/msg', {
				user_msg : 1,
				receiver : conversationName,
				message : $('#input-message').val()
    }, function(msg) {
				$('#input-message').val("");
		});
}

function refreshHistory(conversation, page) {
		$("#history-list").empty();
		var ret = false;
		$('#conversation-name').text(conversation);
		$('#pageShow').text("第" + page.toString() + "页");
		$.get('/user/msg', {
				getHistory : '',
				conversationName : conversation,
				pageNumber : page
		}, function(msg) {
				var result = JSON.parse(msg);
				var cnt = 0, flag = 0, F = 0;
				if (result.length == 11) flag = 1, F = 1;
				result.reverse();
				for (msg in result) {
						if (flag) {flag = 0; continue;}
						var message = result[msg];
						addBubble(message[0], message[1], message[2], message[3], conversation, page, message[4]);
						if ((++cnt) + 1 == result.length  &&  F) break;
				}
				if (result.length == 11) ret = true;
		});
		return ret;
}

function refreshConversations() {
	$("#conversations").empty();
    $.get('/user/msg', {
			getConversations : ""
		}, function(msg) {
			var result = JSON.parse(msg);
			for (i in result) {
				var conversation = result[i];
				if (conversation[1] == 1) {
					addButton(conversation[2], conversation[0], conversation[1]);
				}
			}
			for (i in result) {
				var conversation = result[i];
				if (conversation[1] == 0) {
					addButton(conversation[2], conversation[0], conversation[1]);
				}
			}
		}
	);
}

function enterConversation(conversationName) {
	var slideTime = 300;
	var page = 1;
	$("#conversations").hide(slideTime);
    var changeAble = refreshHistory(conversationName, page);
	$("#history").slideDown(slideTime);
	$('#form-message').unbind("submit").submit(function() {
		submitMessagePost(conversationName);
		page = 1;
		changeAble = refreshHistory(conversationName, page);
		refreshConversations();
		return false;
	});
	$('#goBack').unbind("click").click(function() {
		refreshConversations();
		$("#history").slideUp(slideTime);
		$("#conversations").show(slideTime);
		return;
	});
	$('#pageLeft').unbind("click").click(function() {
		if (changeAble) page++;
		changeAble = refreshHistory(conversationName, page);
		return false;
	});
	$('#pageLeft2').unbind("click").click(function() {
		if (changeAble) page++;
		changeAble = refreshHistory(conversationName, page);
	});
	$('#pageRight').unbind("click").click(function() {
		if (page > 1) page--;
		changeAble = refreshHistory(conversationName, page);
		return false;
	});
	$('#pageRight2').unbind("click").click(function() {
		if (page > 1) page--;
		changeAble = refreshHistory(conversationName, page);
	});
}

</script>

<?php echoUOJPageFooter() ?>