Add HTTP function for invoice validation

ImportAssist.slnx

@@ -3,4 +3,7 @@
     <Project Path="src/ImportAssist.Cli/ImportAssist.Cli.csproj" />
     <Project Path="src/ImportAssist.Core/ImportAssist.Core.csproj" />
   </Folder>
+  <Folder Name="/src/ImportAssist.Functions/">
+    <Project Path="src/ImportAssist.Functions/ImportAssist_Functions.csproj" />
+  </Folder>
 </Solution>

src/ImportAssist.Functions/.gitignore

@@ -0,0 +1,264 @@
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+local.settings.json
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src/ImportAssist.Functions/.vscode/extensions.json

@@ -0,0 +1,5 @@
+{
+    "recommendations": [
+        "ms-azuretools.vscode-azurefunctions"
+    ]
+}

src/ImportAssist.Functions/ImportAssist_Functions.csproj

@@ -0,0 +1,25 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
+    <OutputType>Exe</OutputType>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker" Version="2.52.0" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.OpenTelemetry" Version="1.2.0" />
+    <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.15.3" />
+    <PackageReference Include="Azure.Monitor.OpenTelemetry.Exporter" Version="1.7.0" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.Http.AspNetCore" Version="2.1.0" />
+    <PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="2.0.7" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ImportAssist.Core\ImportAssist.Core.csproj" />
+  </ItemGroup>
+
+</Project>

src/ImportAssist.Functions/Program.cs

@@ -0,0 +1,20 @@
+using Azure.Monitor.OpenTelemetry.Exporter;
+using Microsoft.Azure.Functions.Worker;
+using Microsoft.Azure.Functions.Worker.Builder;
+using Microsoft.Azure.Functions.Worker.OpenTelemetry;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using OpenTelemetry;
+
+var builder = FunctionsApplication.CreateBuilder(args);
+
+builder.ConfigureFunctionsWebApplication();
+
+if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("APPLICATIONINSIGHTS_CONNECTION_STRING")))
+{
+    builder.Services.AddOpenTelemetry()
+        .UseFunctionsWorkerDefaults()
+        .UseAzureMonitorExporter();
+}
+
+builder.Build().Run();

src/ImportAssist.Functions/Properties/launchSettings.json

@@ -0,0 +1,9 @@
+{
+  "profiles": {
+    "ImportAssist_Functions": {
+      "commandName": "Project",
+      "commandLineArgs": "--port 7230",
+      "launchBrowser": false
+    }
+  }
+}

src/ImportAssist.Functions/ValidateInvoice.cs

@@ -0,0 +1,57 @@
+using System.Text.Json;
+using ImportAssist.Core;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Azure.Functions.Worker;
+using Microsoft.Extensions.Logging;
+
+namespace ImportAssist_Functions;
+
+public sealed class ValidateInvoice(ILogger<ValidateInvoice> logger)
+{
+    private static readonly JsonSerializerOptions JsonOptions =
+        new(JsonSerializerDefaults.Web);
+
+    [Function("ValidateInvoice")]
+    public async Task<IActionResult> Run(
+        [HttpTrigger(AuthorizationLevel.Function, "post")] HttpRequest request)
+    {
+        InvoiceRow? row;
+
+        try
+        {
+            row = await JsonSerializer.DeserializeAsync<InvoiceRow>(
+                request.Body,
+                JsonOptions,
+                request.HttpContext.RequestAborted);
+        }
+        catch (JsonException)
+        {
+            return new BadRequestObjectResult(new
+            {
+                error = "Der Request muss ein Rechnungsobjekt mit Textfeldern enthalten."
+            });
+        }
+
+        if (row is null)
+        {
+            return new BadRequestObjectResult(new
+            {
+                error = "Ein Rechnungsobjekt ist erforderlich."
+            });
+        }
+
+        var errors = InvoiceValidator.Validate(row);
+
+        logger.LogInformation(
+            "Rechnungsprüfung abgeschlossen: {ErrorCount} Fehler.",
+            errors.Count);
+
+        return new OkObjectResult(new
+        {
+            invoiceId = row.InvoiceId,
+            isValid = errors.Count == 0,
+            errors
+        });
+    }
+}

src/ImportAssist.Functions/host.json

@@ -0,0 +1,4 @@
+{
+    "version": "2.0",
+    "telemetryMode": "OpenTelemetry"
+}