➕ Class for requesting the access token for the API (read & return)

Sources/GameAtlas/Models/API/AuthService.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Net.Http.Json;
+using System.Text;
+using System.Text.Json;
+using Microsoft.Extensions.Options;
+using System.Threading.Tasks;
+
+namespace Models.API
+{
+    public class AuthService
+    {
+        private readonly HttpClient _httpClient;
+
+        public AuthService(HttpClient httpClient)
+        {
+            _httpClient = httpClient;
+        }
+
+        public async Task<OAuthResponse> GetAccessTokenAsync(string clientId, string clientSecret)
+        {
+            var request = new HttpRequestMessage(HttpMethod.Post, "https://id.twitch.tv/oauth2/token");
+            request.Content = new FormUrlEncodedContent(new[]
+            {
+                new KeyValuePair<string, string>("client_id", clientId),
+                new KeyValuePair<string, string>("client_secret", clientSecret),
+                new KeyValuePair<string, string>("grant_type", "client_credentials")
+            });
+
+            var response = await _httpClient.SendAsync(request);
+
+            if (!response.IsSuccessStatusCode)
+            {
+                var errorContent = await response.Content.ReadAsStringAsync();
+                Console.WriteLine($"Request error: {response.StatusCode}, Content: {errorContent}");
+                throw new HttpRequestException($"Response status code does not indicate success: {response.StatusCode} ({errorContent})");
+            }
+
+            var responseContent = await response.Content.ReadAsStringAsync();
+            var oauthResponse = JsonSerializer.Deserialize<OAuthResponse>(responseContent);
+            return oauthResponse;
+        }
+    }
+}