Init commit

add security encryption and hashing: WIP
add endpoints: register user, get and save resources
add db main operations, User entity

Azaion.Services/UserService.cs

@@ -0,0 +1,56 @@
+using Azaion.Common;
+using Azaion.Common.Database;
+using Azaion.Common.Entities;
+using Azaion.Common.Requests;
+using LinqToDB;
+
+namespace Azaion.Services;
+
+public interface IUserService
+{
+    Task RegisterUser(RegisterUserRequest request, CancellationToken cancellationToken = default);
+    Task<User?> ValidateUser(GetResourceRequest request, CancellationToken cancellationToken = default);
+}
+
+public class UserService(IDbFactory dbFactory) : IUserService
+{
+    public async Task RegisterUser(RegisterUserRequest request, CancellationToken cancellationToken = default)
+    {
+        await dbFactory.Run(async db =>
+        {
+            var existingUser = await db.Users.FirstOrDefaultAsync(u => u.Username == request.Email, token: cancellationToken);
+            if (existingUser != null)
+                throw new BusinessException(ExceptionEnum.UserExists, "User already exists");
+
+            await db.InsertAsync(new User
+            {
+                Username = request.Email,
+                PasswordHash = request.Password.ToHash(),
+                Role = request.Role
+            }, token: cancellationToken);
+        });
+    }
+
+    public async Task<User?> ValidateUser(GetResourceRequest request, CancellationToken cancellationToken = default) =>
+        await dbFactory.Run(async db =>
+        {
+            var user = await db.Users.FirstOrDefaultAsync(x => x.Username == request.Username, token: cancellationToken);
+            if (user == null)
+                throw new BusinessException(ExceptionEnum.NoUserFound, "No user found");
+
+            if (request.Password.ToHash() != user.PasswordHash)
+                throw new BusinessException(ExceptionEnum.PasswordIncorrect, "Passwords do not match");
+
+            //If user's hardware Id is empty (usually on the first time login), then write down user
+            if (string.IsNullOrEmpty(user.HardwareId))
+                await db.Users.UpdateAsync(x => x.Username == request.Username, u => new User{HardwareId = request.HardwareId}, token: cancellationToken);
+            else
+            {
+                //But if hardware Id exists, it should match with request
+                if (user.HardwareId != request.HardwareId)
+                    throw new BusinessException(ExceptionEnum.HardwareIdMismatch, "Hardware id mismatch");
+            }
+
+            return user;
+        });
+}