/// <summary>
/// 验证验证码
/// </summary>
/// <param name="captchaId">验证码ID</param>
/// <param name="captchaText">验证码文本</param>
/// <returns>表示异步验证验证码的任务，如果验证码错误，返回错误信息</returns>
private async Task <string> ValidateCaptchaAsync(string captchaId, string captchaText)
{
// 如果用户直接请求该接口
if (string.IsNullOrEmpty(captchaId) || string.IsNullOrEmpty(captchaText))
{
return(_msg.GetMessage("E007", "验证码"));
}
Captcha captcha = await _dbContext.Captcha.FindAsync(captchaId);
if (captcha == null)
{
// 验证码已失效
return(_msg.GetMessage("E011"));
}
else
{
// 及时将验证码删除
_dbContext.Remove(captcha);
await _dbContext.SaveChangesAsync();
if (captcha.Text != captchaText.ToUpper())
{
// 验证码错误
return(_msg.GetMessage("E001", "验证码"));
}
}
return(null);
}
/// <summary>
/// 获取用户上一次登录时所在的房间ID
/// </summary>
/// <param name="uid">用户ID</param>
/// <returns>表示获取用户上一次登录时所在的房间ID的任务</returns>
public async Task <string> GetPreviousRoomIdAsync(int uid)
{
var connection = await _dbContext.Connection
.Where(conn => conn.UserId == uid && !conn.IsDeleted.Value)
.FirstOrDefaultAsync();
// 连接信息没找到
if (connection == null)
{
return(null);
}
var room = await _dbContext.ChatRoom.FindAsync(connection.RoomId);
if (room == null)
{
// 如果房间没找到，但连接信息却找到了，说明之前的数据有问题
// 删除连接信息
_dbContext.Remove(connection);
await _dbContext.SaveChangesAsync();
return(null);
}
return(HashidsHelper.Encode(connection.RoomId));
}
public async Task RemoveMemberAsync(string roomHashid, string memberHashid)
{
int roomId = HashidsHelper.Decode(roomHashid);
int userId = HashidsHelper.Decode(Context.User.FindFirst("uid").Value);
// 判断用户是否为房主，只有房主才有删除成员的权限
var count = await _dbContext.ChatRoom
.CountAsync(room => room.Id == roomId && room.OwnerId == userId);
if (count == 0)
{
return;
}
int memberId = HashidsHelper.Decode(memberHashid);
var connection = await _dbContext.Connection
.FirstOrDefaultAsync(conn => conn.UserId == memberId);
// 从数据库中删除
_dbContext.Remove(connection);
await _dbContext.SaveChangesAsync();
// 通知被删除的用户
await Clients.Client(connection.ConnectionId)
.InvokeAsync("onRemoved",
_msg.GetMessage("I005", "你"));
// 通知房间内其他用户
await Clients.Group(roomHashid)
.InvokeAsync("receiveSystemMessage",
_msg.GetMessage("I005", connection.Username));
// 刷新成员列表
await RefreshMemberListAsync(roomHashid, roomId);
await Groups.RemoveAsync(connection.ConnectionId, roomHashid);
}