Add photobooth connect codes and uploader scaffold

clients/photobooth-uploader/PhotoboothUploader/Services/PhotoboothConnectClient.cs

@@ -0,0 +1,46 @@
+using System.Net.Http.Json;
+using System.Text.Json;
+using PhotoboothUploader.Models;
+
+namespace PhotoboothUploader.Services;
+
+public sealed class PhotoboothConnectClient
+{
+    private readonly HttpClient _httpClient;
+    private readonly JsonSerializerOptions _jsonOptions = new()
+    {
+        PropertyNameCaseInsensitive = true,
+    };
+
+    public PhotoboothConnectClient(string baseUrl)
+    {
+        _httpClient = new HttpClient
+        {
+            BaseAddress = new Uri(baseUrl),
+        };
+    }
+
+    public async Task<PhotoboothConnectResponse> RedeemAsync(string code, CancellationToken cancellationToken = default)
+    {
+        var response = await _httpClient.PostAsJsonAsync("/api/v1/photobooth/connect", new { code }, cancellationToken);
+        var payload = await response.Content.ReadFromJsonAsync<PhotoboothConnectResponse>(_jsonOptions, cancellationToken);
+
+        if (payload is null)
+        {
+            return new PhotoboothConnectResponse
+            {
+                Message = response.ReasonPhrase ?? "Verbindung fehlgeschlagen.",
+            };
+        }
+
+        if (!response.IsSuccessStatusCode)
+        {
+            return new PhotoboothConnectResponse
+            {
+                Message = payload.Message ?? "Verbindung fehlgeschlagen.",
+            };
+        }
+
+        return payload;
+    }
+}