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using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Threading.Tasks;
using Timeline.Entities;
using Timeline.Models.Validation;
using Timeline.Services.Token;
namespace Timeline.Services.User
{
public class UserService : BasicUserService, IUserService
{
private readonly ILogger<UserService> _logger;
private readonly IClock _clock;
private readonly DatabaseContext _databaseContext;
private readonly IPasswordService _passwordService;
private readonly IUserTokenService _userTokenService;
private readonly UsernameValidator _usernameValidator = new UsernameValidator();
private readonly NicknameValidator _nicknameValidator = new NicknameValidator();
public UserService(ILogger<UserService> logger, DatabaseContext databaseContext, IPasswordService passwordService, IUserTokenService userTokenService, IClock clock) : base(databaseContext)
{
_logger = logger;
_databaseContext = databaseContext;
_passwordService = passwordService;
_userTokenService = userTokenService;
_clock = clock;
}
private void CheckUsernameFormat(string username, string? paramName)
{
if (!_usernameValidator.Validate(username, out var message))
{
throw new ArgumentException(string.Format(CultureInfo.CurrentCulture, Resource.ExceptionUsernameBadFormat, message), paramName);
}
}
private static void CheckPasswordFormat(string password, string? paramName)
{
if (password.Length == 0)
{
throw new ArgumentException(Resource.ExceptionPasswordEmpty, paramName);
}
}
private void CheckNicknameFormat(string nickname, string? paramName)
{
if (!_nicknameValidator.Validate(nickname, out var message))
{
throw new ArgumentException(string.Format(CultureInfo.CurrentCulture, Resource.ExceptionNicknameBadFormat, message), paramName);
}
}
private static EntityAlreadyExistException CreateUsernameConflictException(string username)
{
throw new EntityAlreadyExistException(EntityTypes.User,
new Dictionary<string, object> { ["username"] = username });
}
public async Task<UserEntity> GetUserAsync(long id)
{
var user = await _databaseContext.Users.Where(u => u.Id == id).SingleOrDefaultAsync();
if (user is null)
throw CreateUserNotExistException(id);
return user;
}
public async Task<List<UserEntity>> GetUsersAsync()
{
return await _databaseContext.Users.ToListAsync();
}
public async Task<UserEntity> CreateUserAsync(CreateUserParams param)
{
if (param is null)
throw new ArgumentNullException(nameof(param));
if (param.Username is null)
throw new ArgumentException(Resource.ExceptionUsernameNull, nameof(param));
if (param.Password is null)
throw new ArgumentException(Resource.ExceptionPasswordNull, nameof(param));
CheckUsernameFormat(param.Username, nameof(param));
CheckPasswordFormat(param.Password, nameof(param));
if (param.Nickname is not null)
CheckNicknameFormat(param.Nickname, nameof(param));
var conflict = await _databaseContext.Users.AnyAsync(u => u.Username == param.Username);
if (conflict)
throw CreateUsernameConflictException(param.Username);
var newEntity = new UserEntity
{
Username = param.Username,
Password = _passwordService.HashPassword(param.Password),
Nickname = param.Nickname,
Version = 1
};
_databaseContext.Users.Add(newEntity);
await _databaseContext.SaveChangesAsync();
_logger.LogInformation(Resource.LogUserCreated, param.Username, newEntity.Id);
return newEntity;
}
public async Task<UserEntity> ModifyUserAsync(long id, ModifyUserParams? param)
{
if (param is not null)
{
if (param.Username is not null)
CheckUsernameFormat(param.Username, nameof(param));
if (param.Password is not null)
CheckPasswordFormat(param.Password, nameof(param));
if (param.Nickname is not null)
CheckNicknameFormat(param.Nickname, nameof(param));
}
var entity = await _databaseContext.Users.Where(u => u.Id == id).SingleOrDefaultAsync();
if (entity is null)
throw CreateUserNotExistException(id);
if (param is not null)
{
var now = _clock.GetCurrentTime();
bool updateLastModified = false;
var username = param.Username;
if (username is not null && username != entity.Username)
{
var conflict = await _databaseContext.Users.AnyAsync(u => u.Username == username);
if (conflict)
throw CreateUsernameConflictException(username);
entity.Username = username;
entity.UsernameChangeTime = now;
updateLastModified = true;
}
var password = param.Password;
if (password is not null)
{
entity.Password = _passwordService.HashPassword(password);
entity.Version += 1;
}
var nickname = param.Nickname;
if (nickname is not null && nickname != entity.Nickname)
{
entity.Nickname = nickname;
updateLastModified = true;
}
if (updateLastModified)
{
entity.LastModified = now;
}
await _databaseContext.SaveChangesAsync();
_logger.LogInformation(Resource.LogUserModified, entity.Username, id);
if (password is not null)
{
await _userTokenService.RevokeAllTokenByUserIdAsync(id);
}
}
return entity;
}
public async Task<long> VerifyCredential(string username, string password)
{
if (username is null)
throw new ArgumentNullException(nameof(username));
if (password is null)
throw new ArgumentNullException(nameof(password));
CheckUsernameFormat(username, nameof(username));
CheckPasswordFormat(password, nameof(password));
var entity = await _databaseContext.Users.Where(u => u.Username == username).Select(u => new { u.Id, u.Password }).SingleOrDefaultAsync();
if (entity is null)
{
_logger.LogInformation(Resource.LogVerifyCredentialsUsernameBad, username);
throw CreateUserNotExistException(username);
}
if (!_passwordService.VerifyPassword(entity.Password, password))
{
_logger.LogInformation(Resource.LogVerifyCredentialsPasswordBad, username);
throw new BadPasswordException(password);
}
return entity.Id;
}
public async Task ChangePassword(long id, string oldPassword, string newPassword)
{
if (oldPassword == null)
throw new ArgumentNullException(nameof(oldPassword));
if (newPassword == null)
throw new ArgumentNullException(nameof(newPassword));
CheckPasswordFormat(oldPassword, nameof(oldPassword));
CheckPasswordFormat(newPassword, nameof(newPassword));
var entity = await _databaseContext.Users.Where(u => u.Id == id).SingleOrDefaultAsync();
if (entity is null)
throw CreateUserNotExistException(id);
if (!_passwordService.VerifyPassword(entity.Password, oldPassword))
throw new BadPasswordException(oldPassword);
entity.Password = _passwordService.HashPassword(newPassword);
entity.Version += 1;
await _databaseContext.SaveChangesAsync();
_logger.LogInformation(Resource.LogChangePassowrd, entity.Username, id);
await _userTokenService.RevokeAllTokenByUserIdAsync(id);
}
}
}
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