blob: a3763ef68aee27cc0ada236c3dcfe138ce204b9e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
using Microsoft.EntityFrameworkCore;
using System;
using System.Linq;
using System.Threading.Tasks;
using Timeline.Entities;
using Timeline.Models.Validation;
namespace Timeline.Services.User
{
/// <summary>
/// This service provide some basic user features, which should be used internally for other services.
/// </summary>
public interface IBasicUserService
{
/// <summary>
/// Check if a user exists.
/// </summary>
/// <param name="id">The id of the user.</param>
/// <returns>True if exists. Otherwise false.</returns>
Task<bool> CheckUserExistence(long id);
/// <summary>
/// Get the user id of given username.
/// </summary>
/// <param name="username">Username of the user.</param>
/// <returns>The id of the user.</returns>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="username"/> is null.</exception>
/// <exception cref="ArgumentException">Thrown when <paramref name="username"/> is of bad format.</exception>
/// <exception cref="UserNotExistException">Thrown when the user with given username does not exist.</exception>
Task<long> GetUserIdByUsername(string username);
/// <summary>
/// Get the username modified time of a user.
/// </summary>
/// <param name="userId">User id.</param>
/// <returns>The time.</returns>
/// <exception cref="UserNotExistException">Thrown when user does not exist.</exception>
Task<DateTime> GetUsernameLastModifiedTime(long userId);
}
public class BasicUserService : IBasicUserService
{
private readonly DatabaseContext _database;
private readonly UsernameValidator _usernameValidator = new UsernameValidator();
public BasicUserService(DatabaseContext database)
{
_database = database;
}
public async Task<bool> CheckUserExistence(long id)
{
return await _database.Users.AnyAsync(u => u.Id == id);
}
public async Task<long> GetUserIdByUsername(string username)
{
if (username == null)
throw new ArgumentNullException(nameof(username));
if (!_usernameValidator.Validate(username, out var message))
throw new ArgumentException(message);
var entity = await _database.Users.Where(user => user.Username == username).Select(u => new { u.Id }).SingleOrDefaultAsync();
if (entity == null)
throw new UserNotExistException(username);
return entity.Id;
}
public async Task<DateTime> GetUsernameLastModifiedTime(long userId)
{
var entity = await _database.Users.Where(u => u.Id == userId).Select(u => new { u.UsernameChangeTime }).SingleOrDefaultAsync();
if (entity is null)
throw new UserNotExistException(userId);
return entity.UsernameChangeTime;
}
}
public static class BasicUserServiceExtensions
{
public static async Task ThrowIfUserNotExist(this IBasicUserService service, long userId)
{
if (!await service.CheckUserExistence(userId))
{
throw new UserNotExistException(userId);
}
}
}
}
|
