fork from 1.3

FreeSR.Database.Account/AccountDatabase.cs

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+namespace FreeSR.Database.Account
+{
+    using FreeSR.Database.Account.Model;
+    using FreeSR.Database.Account.Util;
+    using FreeSR.Database.Mongo;
+    using MongoDB.Driver;
+
+    public class AccountDatabase : SRMongoDatabase<AccountModel>
+    {
+        private int _maxUid;
+
+        public AccountDatabase(IMongoDatabase database, string collectionName) : base(database, collectionName)
+        {
+            // AccountDatabase.
+        }
+
+        public async Task<AccountModel> Create(string name, string password)
+        {
+            if (_maxUid == 0)
+                _maxUid = await FetchMaxUid();
+
+            if (await GetByName(name) != null)
+                return null;
+
+            var model = new AccountModel
+            {
+                Uid = Interlocked.Increment(ref _maxUid),
+                Name = name,
+                Password = password,
+                CreationDateUtc = DateTime.UtcNow,
+                Token = AccountTokenUtil.Generate()
+            };
+
+            await Insert(model);
+            return model;
+        }
+
+        public async Task<AccountModel> GetByUid(int uid)
+        {
+            return await FindOne(account => account.Uid == uid);
+        }
+
+        public async Task<AccountModel> GetByName(string name)
+        {
+            return await FindOne(account => account.Name == name);
+        }
+
+        public async Task Update(AccountModel account)
+        {
+            await Update(model => model.Uid == account.Uid, account);
+        }
+
+        private async Task<int> FetchMaxUid()
+        {
+            var maxUidAccount = await FindMax(account => account.Uid);
+            return maxUidAccount?.Uid ?? 0;
+        }
+    }
+}

FreeSR.Database.Account/FreeSR.Database.Account.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>disable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\FreeSR.Database\FreeSR.Database.csproj" />
+  </ItemGroup>
+
+</Project>

FreeSR.Database.Account/Model/AccountModel.cs

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+namespace FreeSR.Database.Account.Model
+{
+    using MongoDB.Bson.Serialization.Attributes;
+
+    [BsonIgnoreExtraElements]
+    public class AccountModel
+    {
+        public int Uid { get; set; }
+        public string Name { get; set; }
+        public string Password { get; set; }
+        public string Token { get; set; }
+        public DateTime CreationDateUtc { get; set; }
+    }
+}

FreeSR.Database.Account/Util/AccountTokenUtil.cs

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+namespace FreeSR.Database.Account.Util
+{
+    using FreeSR.Database.Account.Model;
+
+    public static class AccountTokenUtil
+    {
+        private const int AccountTokenLength = 128;
+        private const string TokenCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+
+        private static Random s_random;
+
+        static AccountTokenUtil()
+        {
+            s_random = new Random();
+        }
+
+        public static string Generate()
+        {
+            var token = "";
+
+            for (int i = 0; i < AccountTokenLength; i++)
+            {
+                token += TokenCharacters[s_random.Next(TokenCharacters.Length)];
+            }
+
+            return token;
+        }
+
+        public static bool Verify(AccountModel accountModel, string clientToken)
+        {
+            if (accountModel == null)
+                return false;
+
+            return string.Equals(accountModel.Token, clientToken);
+        }
+    }
+}