Merge branch 'exception-handling-middleware' into 'Milestone-1'

Added exception handler middleware

See merge request !11

Api/Middleware/ExceptionHandlerMiddleware.cs

+using Microsoft.AspNetCore.Diagnostics;
+
+namespace Api.Middleware
+{
+    public class ExceptionHandlerMiddleware : IExceptionHandler
+    {
+        private readonly ILogger<ExceptionHandlerMiddleware> _logger;
+        
+        public ExceptionHandlerMiddleware(ILogger<ExceptionHandlerMiddleware> logger)
+        {
+            _logger = logger;
+        }
+
+        public async ValueTask<bool> TryHandleAsync(HttpContext httpContext, Exception exception, CancellationToken cancellationToken)
+        {
+            httpContext.Response.StatusCode = 500;
+            httpContext.Response.ContentType = "application/json";
+            _logger.LogInformation($"[{DateTimeOffset.Now}] {exception.GetType().Name} at ID {httpContext.TraceIdentifier}, Method {httpContext.Request.Method}: \"{exception.Message}\"");
+
+            var error = new
+            {
+                StatusCode = 500,
+                Message = "The server encountered an unexpected error. Please try again later."
+            };
+            await httpContext.Response.WriteAsJsonAsync(error, cancellationToken: cancellationToken);
+            return true;
+        }
+    }
+}

Api/Program.cs

+using Api.Middleware;
 using DAL.Data;
 using Microsoft.EntityFrameworkCore;
 
@@ -10,6 +11,8 @@ IConfigurationRoot configuration = new ConfigurationBuilder()
     .AddJsonFile($"appsettings.{envName}.json", optional: true, reloadOnChange: true)
     .Build();
 
+builder.Services.AddLogging();
+
 // Add services to the container.
 builder.Services.AddDbContextFactory<RestaurantDBContext>(options =>
     options.UseSqlServer(configuration.GetConnectionString("MSSQL"))
@@ -20,6 +23,7 @@ builder.Services.AddControllers();
 // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
+builder.Services.AddExceptionHandler<ExceptionHandlerMiddleware>();
 
 var app = builder.Build();
 
@@ -28,6 +32,11 @@ if (app.Environment.IsDevelopment())
 {
     app.UseSwagger();
     app.UseSwaggerUI();
+    app.UseDeveloperExceptionPage();
+}
+else
+{
+    app.UseExceptionHandler("/Error");
 }
 
 app.UseHttpsRedirection();