1 files changed, 33 insertions, 0 deletions
diff --git a/Timeline/Services/UserService.cs b/Timeline/Services/UserService.cs
new file mode 100644
index 00000000..b3d76e3e
--- /dev/null
+++ b/Timeline/Services/UserService.cs
@@ -0,0 +1,33 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Timeline.Entities;
+
+namespace Timeline.Services
+{
+    public interface IUserService
+    {
+        /// <summary>
+        /// Try to anthenticate with the given username and password.
+        /// </summary>
+        /// <param name="username">The username of the user to be anthenticated.</param>
+        /// <param name="password">The password of the user to be anthenticated.</param>
+        /// <returns><c>null</c> if anthentication failed.
+        /// An instance of <see cref="User"/> if anthentication succeeded.</returns>
+        User Authenticate(string username, string password);
+    }
+
+    public class UserService : IUserService
+    {
+        private readonly IList<User> _users = new List<User>{
+            new User { Id = 0, Username = "hello", Password = "crupest" },
+            new User { Id = 1, Username = "test", Password = "test"}
+        };
+
+        public User Authenticate(string username, string password)
+        {
+            return _users.FirstOrDefault(user => user.Username == username && user.Password == password);
+        }
+    }
+}