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| author | crupest <crupest@outlook.com> | 2021-04-25 21:20:04 +0800 |
|---|---|---|
| committer | crupest <crupest@outlook.com> | 2021-04-25 21:20:04 +0800 |
| commit | a4a75188bd17e31b39a02511bbd6d628bab5c909 (patch) | |
| tree | f2f9c63eb5beabb7a1a2f2605c2d5022f6a72c08 /BackEnd/Timeline/Services/User/BasicUserService.cs | |
| parent | 434be212c77bdade04722046e92c3dac25d0aff3 (diff) | |
| download | timeline-a4a75188bd17e31b39a02511bbd6d628bab5c909.tar.gz timeline-a4a75188bd17e31b39a02511bbd6d628bab5c909.tar.bz2 timeline-a4a75188bd17e31b39a02511bbd6d628bab5c909.zip | |
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Diffstat (limited to 'BackEnd/Timeline/Services/User/BasicUserService.cs')
| -rw-r--r-- | BackEnd/Timeline/Services/User/BasicUserService.cs | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/BackEnd/Timeline/Services/User/BasicUserService.cs b/BackEnd/Timeline/Services/User/BasicUserService.cs new file mode 100644 index 00000000..a3763ef6 --- /dev/null +++ b/BackEnd/Timeline/Services/User/BasicUserService.cs @@ -0,0 +1,94 @@ +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);
+ }
+ }
+ }
+}
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