Add project files.

ConfigurationPannel/Services/UserService.cs

@@ -0,0 +1,39 @@
+using System.Text.Json;
+
+namespace ConfigurationPannel.Services;
+
+public class UserService
+{
+    private readonly string _usersFilePath;
+
+    public UserService(IWebHostEnvironment env)
+    {
+        _usersFilePath = Path.Combine(env.ContentRootPath, "users.json");
+    }
+
+    public async Task<bool> ValidateCredentialsAsync(string username, string password)
+    {
+        if (!File.Exists(_usersFilePath))
+            return false;
+
+        var json = await File.ReadAllTextAsync(_usersFilePath);
+        var userStore = JsonSerializer.Deserialize<UserStore>(json, new JsonSerializerOptions(){PropertyNameCaseInsensitive = true});
+        var user = userStore?.Users.FirstOrDefault(u => u.Username == username);
+
+        if (user == null)
+            return false;
+
+        return user.Password==password;
+    }
+}
+
+public class UserStore
+{
+    public List<User> Users { get; set; } = new();
+}
+
+public class User
+{
+    public string Username { get; set; } = string.Empty;
+    public string Password { get; set; } = string.Empty;
+}