Exceptions handling

SchengenVisaApi/ApplicationLayer/DataAccessingServices/Locations/RequestHandlers/AdminRequests/EditLocationsRequestsHandler.cs

@@ -18,7 +18,7 @@ namespace ApplicationLayer.DataAccessingServices.Locations.RequestHandlers.Admin
 
             if (request.Cities.Distinct().Count() < request.Cities.Length)
             {
-                throw new MultipleIdenticalCitiesInCountry();
+                throw new MultipleIdenticalCitiesInCountryException();
             }
 
             var country = new Country

SchengenVisaApi/ApplicationLayer/DataAccessingServices/Locations/RequestHandlers/AdminRequests/Exceptions/MultipleIdenticalCitiesInCountryException.cs

@@ -2,5 +2,5 @@
 
 namespace ApplicationLayer.DataAccessingServices.Locations.RequestHandlers.AdminRequests.Exceptions
 {
-    public class MultipleIdenticalCitiesInCountry() : ApiException("There are multiple cities with one name in the country.");
+    public class MultipleIdenticalCitiesInCountryException() : ApiException("There are multiple cities with one name in the country.");
 }

SchengenVisaApi/Infrastructure/Database/GeneralExceptions/EntityNotFoundByIdException.cs

@@ -5,5 +5,5 @@ namespace Infrastructure.Database.GeneralExceptions;
 /// Exception to throw when entity not found
 /// <param name="id">Identifier of entity</param>
 /// <typeparam name="T">Type of entity</typeparam>
-public class EntityNotFoundByIdException<T>(Guid id) : EntityNotFoundException<T>($"Entity {typeof(T).Name} with id {id} not found.")
-    where T : class, IEntity;
+public class EntityNotFoundByIdException<T>(Guid id) : EntityNotFoundException<T>($"{typeof(T).Name} with id {id} not found.")
+    where T : class, IEntity;

SchengenVisaApi/SchengenVisaApi/DependencyInjection.cs

@@ -10,6 +10,7 @@ using Microsoft.AspNetCore.Authorization;
 using Microsoft.Extensions.Options;
 using Microsoft.IdentityModel.Tokens;
 using SchengenVisaApi.Common;
+using SchengenVisaApi.ExceptionFilters;
 using Swashbuckle.AspNetCore.SwaggerGen;
 
 namespace SchengenVisaApi;
@@ -39,7 +40,9 @@ public static class DependencyInjection
             services.AddSwagger();
         }
 
-        services.AddControllers();
+        services.AddProblemDetails();
+
+        services.AddControllers(opts => opts.Filters.Add<GlobalExceptionsFilter>());
     }
 
     /// Adds authentication, authorization and token generator

SchengenVisaApi/SchengenVisaApi/ExceptionFilters/GlobalExceptionsFilter.cs

@@ -0,0 +1,63 @@
+using ApplicationLayer.DataAccessingServices.AuthServices.LoginService.Exceptions;
+using ApplicationLayer.DataAccessingServices.Locations.RequestHandlers.AdminRequests.Exceptions;
+using ApplicationLayer.GeneralExceptions;
+using Domains;
+using Infrastructure.Database.GeneralExceptions;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.Filters;
+
+namespace SchengenVisaApi.ExceptionFilters
+{
+    /// Handles <see cref="ApiException"/>
+    public class GlobalExceptionsFilter : IAsyncExceptionFilter
+    {
+        /// <inheritdoc cref="IExceptionFilter.OnException"/>
+        public async Task OnExceptionAsync(ExceptionContext context)
+        {
+            var exception = context.Exception;
+            var problemDetails = new ProblemDetails();
+
+            if (exception is ApiException)
+            {
+                problemDetails.Detail = exception.Message;
+                switch (exception)
+                {
+                    case EntityNotFoundException<IEntity>:
+                        problemDetails.Status = StatusCodes.Status404NotFound;
+                        problemDetails.Title = "Requested entity not found";
+                        problemDetails.Type = "https://datatracker.ietf.org/doc/html/rfc7231#section-6.5.4";
+                        break;
+                    case IncorrectLoginDataException:
+                        problemDetails.Status = StatusCodes.Status403Forbidden;
+                        problemDetails.Title = "Auth failed";
+                        problemDetails.Type = "https://datatracker.ietf.org/doc/html/rfc7231#section-6.5.3";
+                        break;
+                    case AlreadyExistsException:
+                        problemDetails.Status = StatusCodes.Status409Conflict;
+                        problemDetails.Title = "Already exists";
+                        problemDetails.Type = "https://datatracker.ietf.org/doc/html/rfc7231#section-6.5.8";
+                        break;
+                    case MultipleIdenticalCitiesInCountryException:
+                        problemDetails.Status = StatusCodes.Status400BadRequest;
+                        problemDetails.Title = "Can not add cities with one name to one country";
+                        problemDetails.Type = "https://datatracker.ietf.org/doc/html/rfc7231#section-6.5.1";
+                        break;
+                    default:
+                        problemDetails.Status = StatusCodes.Status400BadRequest;
+                        problemDetails.Title = "Bad request";
+                        problemDetails.Type = "https://datatracker.ietf.org/doc/html/rfc7231#section-6.5.1";
+                        break;
+                }
+            }
+            else
+            {
+                problemDetails.Status = StatusCodes.Status500InternalServerError;
+                problemDetails.Title = "An unhandled error occured";
+                problemDetails.Type = "https://datatracker.ietf.org/doc/html/rfc7231#section-6.6.1";
+            }
+
+            await Results.Problem(problemDetails).ExecuteAsync(context.HttpContext);
+            context.ExceptionHandled = true;
+        }
+    }
+}

SchengenVisaApi/SchengenVisaApi/RequestPipeline.cs

@@ -11,6 +11,8 @@ public static class PipelineRequest
 
         app.UseHttpsRedirection();
 
+        app.UseStatusCodePages();
+
         app.UseAuthentication()
             .UseAuthorization();