CNB Exchange Rate Provider - .Net 8

.gitignore

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-!.gitkeep
-!.gitignore
-!*.dll
-[Oo]bj
-[Bb]in
-*.user
-*.suo
-*.[Cc]ache
-*.bak
-*.ncb
-*.DS_Store
-*.userprefs
-*.iml
-*.ncrunch*
-.*crunch*.local.xml
-.idea
-[Tt]humbs.db
-*.tgz
-*.sublime-*
-
-node_modules
-bower_components
-npm-debug.log
+## A streamlined .gitignore for modern .NET projects
+## including temporary files, build results, and
+## files generated by popular .NET tools. If you are
+## developing with Visual Studio, the VS .gitignore
+## https://github.com/github/gitignore/blob/main/VisualStudio.gitignore
+## has more thorough IDE-specific entries.
+##
+## Get latest from https://github.com/github/gitignore/blob/main/Dotnet.gitignore
+
+# Rider
+.idea/
+*.DotSettings.user
+
+# Build results
+[Dd]ebug/
+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+[Ww][Ii][Nn]32/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+[Ll]ogs/
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# ASP.NET Scaffolding
+ScaffoldingReadMe.txt
+
+# NuGet Packages
+*.nupkg
+# NuGet Symbol Packages
+*.snupkg
+
+# Others
+~$*
+*~
+CodeCoverage/
+
+# MSBuild Binary and Structured Log
+*.binlog
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUnit
+*.VisualState.xml
+TestResult.xml
+nunit-*.xml

jobs/Backend/Task/.dockerignore

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+**/.dockerignore
+**/.env
+**/.git
+**/.gitignore
+**/.project
+**/.settings
+**/.toolstarget
+**/.vs
+**/.vscode
+**/.idea
+**/*.*proj.user
+**/*.dbmdl
+**/*.jfm
+**/azds.yaml
+**/bin
+**/charts
+**/docker-compose*
+**/Dockerfile*
+**/node_modules
+**/npm-debug.log
+**/obj
+**/secrets.dev.yaml
+**/values.dev.yaml
+LICENSE
+README.md

jobs/Backend/Task/Dockerfile

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+FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+USER $APP_UID
+WORKDIR /app
+EXPOSE 8080
+
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+ARG BUILD_CONFIGURATION=Release
+
+WORKDIR /src
+
+COPY ./ExchangeRateUpdater.sln .
+COPY ./Exchange.Api/ ./Exchange.Api/
+COPY ./Exchange.Application/ ./Exchange.Application/
+COPY ./Exchange.ConsoleApp/ ./Exchange.ConsoleApp/
+COPY ./Exchange.Domain/ ./Exchange.Domain/
+COPY ./Exchange.Infrastructure/ ./Exchange.Infrastructure/
+
+COPY ./Exchange.Application.UnitTests ./Exchange.Application.UnitTests
+COPY ./Exchange.Domain.UnitTests ./Exchange.Domain.UnitTests
+COPY ./Exchange.Infrastructure.UnitTests ./Exchange.Infrastructure.UnitTests
+
+RUN dotnet restore ExchangeRateUpdater.sln
+
+COPY . .
+
+# Build API
+WORKDIR /src/Exchange.Api
+RUN dotnet build -c $BUILD_CONFIGURATION -o /app/build
+
+# Build ConsoleApp
+WORKDIR /src/Exchange.ConsoleApp
+RUN dotnet build -c $BUILD_CONFIGURATION -o /app/build
+
+FROM build AS publish
+ARG BUILD_CONFIGURATION=Release
+
+WORKDIR /src/Exchange.Api
+RUN dotnet publish -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false
+
+WORKDIR /src/Exchange.ConsoleApp
+RUN dotnet publish -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app/publish .
+
+CMD [ "dotnet", "Exchange.ConsoleApp.dll" ]

jobs/Backend/Task/Exchange.Api/Dtos/ExchangeRateDto.cs

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+namespace Exchange.Api.Dtos;
+
+public record ExchangeRateDto(string SourceCurrency, string TargetCurrency, decimal Value);

jobs/Backend/Task/Exchange.Api/Exchange.Api.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.8"/>
+        <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0"/>
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Exchange.Application\Exchange.Application.csproj" />
+      <ProjectReference Include="..\Exchange.Infrastructure\Exchange.Infrastructure.csproj" />
+    </ItemGroup>
+
+</Project>

jobs/Backend/Task/Exchange.Api/Middlewares/ExceptionHandlingMiddleware.cs

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+using Exchange.Domain.Abstractions.Exceptions;
+
+namespace Exchange.Api.Middlewares;
+
+public class ExceptionHandlingMiddleware(RequestDelegate next, ILogger<ExceptionHandlingMiddleware> logger)
+{
+    public async Task InvokeAsync(HttpContext context)
+    {
+        try
+        {
+            await next(context);
+        }
+        catch (BadRequestException ex)
+        {
+            logger.LogError(ex, "A bad request occurred");
+            context.Response.StatusCode = StatusCodes.Status400BadRequest;
+            context.Response.ContentType = "application/json";
+            var response = new
+            {
+                error = ex.Message
+            };
+            await context.Response.WriteAsJsonAsync(response);
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "An unhandled exception occurred during request processing");
+
+            context.Response.StatusCode = StatusCodes.Status500InternalServerError;
+            context.Response.ContentType = "application/json";
+
+            var response = new
+            {
+                error = "An internal server error occurred"
+            };
+
+            await context.Response.WriteAsJsonAsync(response);
+        }
+    }
+}

jobs/Backend/Task/Exchange.Api/Middlewares/RequestTimingMiddleware.cs

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+using System.Diagnostics;
+
+namespace Exchange.Api.Middlewares;
+
+public class RequestTimingMiddleware(RequestDelegate next, ILogger<RequestTimingMiddleware> logger)
+{
+    public async Task Invoke(HttpContext context)
+    {
+        var stopwatch = Stopwatch.StartNew();
+
+        await next(context);
+
+        stopwatch.Stop();
+
+        var elapsedMs = stopwatch.ElapsedMilliseconds;
+        var method = context.Request.Method;
+        var path = context.Request.Path;
+        var statusCode = context.Response.StatusCode;
+
+        logger.LogInformation(
+            "Request {Method} {Path} responded {StatusCode} in {Elapsed} ms",
+            method,
+            path,
+            statusCode,
+            elapsedMs
+        );
+    }
+}

jobs/Backend/Task/Exchange.Api/Program.cs

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+using Exchange.Api.Dtos;
+using Exchange.Api.Middlewares;
+using Exchange.Application.Extensions;
+using Exchange.Application.Services;
+using Exchange.Domain.ValueObjects;
+using Exchange.Infrastructure.Extensions.ServiceCollectionExtensions;
+using Microsoft.AspNetCore.Mvc;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSwaggerGen();
+
+builder.Services.AddDateTimeProvider();
+builder.Services.AddCnbApiClient(builder.Configuration);
+builder.Services.AddInMemoryCache(builder.Configuration);
+builder.Services.AddExchangeRateProvider();
+
+var app = builder.Build();
+
+app.UseMiddleware<RequestTimingMiddleware>();
+app.UseMiddleware<ExceptionHandlingMiddleware>();
+
+app.UseSwagger();
+app.UseSwaggerUI();
+
+app.MapGet("/exchange-rates", async (
+        [FromServices] IExchangeRateProvider exchangeRateProvider,
+        [FromQuery] string[] currencyCodes,
+        CancellationToken cancellationToken
+    ) =>
+    {
+        var requestedCurrencies = currencyCodes.Select(Currency.FromCode).ToList();
+
+        var exchangeRates = await exchangeRateProvider.GetExchangeRatesAsync(requestedCurrencies, cancellationToken);
+
+        return exchangeRates.Select(er =>
+            new ExchangeRateDto(
+                er.SourceCurrency.Code,
+                er.TargetCurrency.Code,
+                er.Value)
+        ).ToList();
+    })
+    .WithName("GetExchangeRates")
+    .Produces<IEnumerable<ExchangeRateDto>>()
+    .Produces(StatusCodes.Status400BadRequest)
+    .WithOpenApi();
+
+await app.RunAsync();

jobs/Backend/Task/Exchange.Api/Properties/launchSettings.json

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+{
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "http://localhost:5032",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:7167;http://localhost:5032",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

jobs/Backend/Task/Exchange.Api/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

jobs/Backend/Task/Exchange.Api/appsettings.json

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+{
+  "CnbApi": {
+    "BaseAddress": "https://api.cnb.cz/",
+    "TimeoutInSeconds": 30
+  },
+  "Cache": {
+    "DefaultAbsoluteExpiration": "10"
+  },
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning",
+      "System.Net.Http.HttpClient": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}