From eb271793ad910d426aa2052ea310b68ae2c95da1 Mon Sep 17 00:00:00 2001
From: shept <sheptikhinv@gmail.com>
Date: Fri, 18 Apr 2025 14:50:01 +0500
Subject: [PATCH] add custom exceptions and start using them in every service

---
 .../Exceptions/ConflictException.cs                    | 10 ++++++++++
 .../Exceptions/ServiceException.cs                     | 10 ++++++++++
 .../Exceptions/UnauthorizedException.cs                | 10 ++++++++++
 .../Services/AuthorizationService.cs                   |  5 +++--
 4 files changed, 33 insertions(+), 2 deletions(-)
 create mode 100644 SurveyBackend/SurveyBackend.Services/Exceptions/ConflictException.cs
 create mode 100644 SurveyBackend/SurveyBackend.Services/Exceptions/ServiceException.cs
 create mode 100644 SurveyBackend/SurveyBackend.Services/Exceptions/UnauthorizedException.cs

diff --git a/SurveyBackend/SurveyBackend.Services/Exceptions/ConflictException.cs b/SurveyBackend/SurveyBackend.Services/Exceptions/ConflictException.cs
new file mode 100644
index 0000000..12d14ce
--- /dev/null
+++ b/SurveyBackend/SurveyBackend.Services/Exceptions/ConflictException.cs
@@ -0,0 +1,10 @@
+namespace SurveyBackend.Services.Exceptions;
+
+public class ConflictException : ServiceException
+{
+    public override int StatusCode => 409;
+
+    public ConflictException(string message) : base(message)
+    {
+    }
+}
\ No newline at end of file
diff --git a/SurveyBackend/SurveyBackend.Services/Exceptions/ServiceException.cs b/SurveyBackend/SurveyBackend.Services/Exceptions/ServiceException.cs
new file mode 100644
index 0000000..30fb016
--- /dev/null
+++ b/SurveyBackend/SurveyBackend.Services/Exceptions/ServiceException.cs
@@ -0,0 +1,10 @@
+namespace SurveyBackend.Services.Exceptions;
+
+public abstract class ServiceException : Exception
+{
+    public abstract int StatusCode { get; }
+
+    protected ServiceException(string message) : base(message)
+    {
+    }
+}
\ No newline at end of file
diff --git a/SurveyBackend/SurveyBackend.Services/Exceptions/UnauthorizedException.cs b/SurveyBackend/SurveyBackend.Services/Exceptions/UnauthorizedException.cs
new file mode 100644
index 0000000..58ea510
--- /dev/null
+++ b/SurveyBackend/SurveyBackend.Services/Exceptions/UnauthorizedException.cs
@@ -0,0 +1,10 @@
+namespace SurveyBackend.Services.Exceptions;
+
+public class UnauthorizedException : ServiceException
+{
+    public override int StatusCode => 401;
+
+    public UnauthorizedException(string message) : base(message)
+    {
+    }
+}
\ No newline at end of file
diff --git a/SurveyBackend/SurveyBackend.Services/Services/AuthorizationService.cs b/SurveyBackend/SurveyBackend.Services/Services/AuthorizationService.cs
index 0e9907f..05acef2 100644
--- a/SurveyBackend/SurveyBackend.Services/Services/AuthorizationService.cs
+++ b/SurveyBackend/SurveyBackend.Services/Services/AuthorizationService.cs
@@ -1,5 +1,6 @@
 using SurveyBackend.Core.Models;
 using SurveyBackend.Core.Services;
+using SurveyBackend.Services.Exceptions;
 using SurveyBackend.Services.Helpers;
 
 namespace SurveyBackend.Services.Services;
@@ -20,7 +21,7 @@ public class AuthorizationService : IAuthorizationService
         var user = await _userService.GetUserByEmail(email);
         if (user is null || !_passwordHasher.Verify(password, user.Password))
         {
-            return null;
+            throw new UnauthorizedException("Email or password is incorrect.");
         }
 
         var token = TokenHelper.GetAuthToken(user);
@@ -32,7 +33,7 @@ public class AuthorizationService : IAuthorizationService
         var existingUser = await _userService.GetUserByEmail(user.Email);
         if (existingUser is not null)
         {
-            throw new Exception("Email already exists");
+            throw new ConflictException("Email already exists");
         }
 
         user.Password = _passwordHasher.HashPassword(user.Password);