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authorcrupest <crupest@outlook.com>2020-01-30 20:26:52 +0800
committercrupest <crupest@outlook.com>2020-01-30 20:26:52 +0800
commit79ab2b304d93b1029515bd3f954db4e5a73f4168 (patch)
tree538ceea06640f501d2a950cac813c10561036e4d /Timeline/Services/DatabaseExtensions.cs
parentdd0097af5c4ccbe25a1faca2286d729c93fd4116 (diff)
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-rw-r--r--Timeline/Services/DatabaseExtensions.cs36
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diff --git a/Timeline/Services/DatabaseExtensions.cs b/Timeline/Services/DatabaseExtensions.cs
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-using Microsoft.EntityFrameworkCore;
-using System;
-using System.Linq;
-using System.Threading.Tasks;
-using Timeline.Entities;
-using Timeline.Models.Validation;
-
-namespace Timeline.Services
-{
- internal static class DatabaseExtensions
- {
- private static readonly UsernameValidator usernameValidator = new UsernameValidator();
-
- /// <summary>
- /// Check the existence and get the id of the user.
- /// </summary>
- /// <param name="username">The username of the user.</param>
- /// <returns>The user id.</returns>
- /// <exception cref="ArgumentNullException">Thrown if <paramref name="username"/> is null.</exception>
- /// <exception cref="UsernameBadFormatException">Thrown if <paramref name="username"/> is of bad format.</exception>
- /// <exception cref="UserNotExistException">Thrown if user does not exist.</exception>
- internal static async Task<long> CheckAndGetUser(DbSet<UserEntity> userDbSet, string? username)
- {
- if (username == null)
- throw new ArgumentNullException(nameof(username));
- var (result, message) = usernameValidator.Validate(username);
- if (!result)
- throw new UsernameBadFormatException(username, message);
-
- var userId = await userDbSet.Where(u => u.Username == username).Select(u => u.Id).SingleOrDefaultAsync();
- if (userId == 0)
- throw new UserNotExistException(username);
- return userId;
- }
- }
-}