[🐛] 추가 안한 Scope 코드 제거

Program.cs

@@ -127,7 +127,7 @@ builder.Services.AddScoped<IRepositoryService, RepositoryService>();
 builder.Services.AddScoped<IHeaderConfig, HeaderConfigRepository>();
 
 builder.Services.AddScoped<IUserService, UserService>();
-builder.Services.AddScoped<IKakaoService, KakaoService>();
+// builder.Services.AddScoped<IKakaoService, KakaoService>();
 builder.Services.AddScoped<IUserRepository, UserRepository>();
 
 builder.Services.AddScoped<IAppService, AppService>();

Program/Services/V1/Interfaces/IKakaoService.cs

@@ -0,0 +1,12 @@
+using Back.Program.Common.Model;
+
+namespace Back.Program.Services.V1.Interfaces;
+
+public interface IKakaoService
+{
+    Task<string> GetAccessToken(string code);
+    Task<string> GetAuthorizationUrl(string scope);
+    Task<(bool Success, string Response)> Redirect(string code);
+    Task<(bool Success, string Response)> Logout(string accessToken);
+    Task<(bool Success, string Response)> Unlink(string accessToken);
+}

Program/Services/V1/KakaoService.cs

@@ -0,0 +1,135 @@
+using System.Text.Json;
+using System.Net.Http.Headers;
+
+using Back.Program.Services.V1.Interfaces;
+
+namespace Back.Program.Services.V1;
+
+public class KakaoService: IKakaoService
+{
+    private readonly HttpClient _httpClient;
+    private const string KAKAO_API_BASE_URL = "https://kapi.kakao.com";
+    private const string KAKAO_AUTH_BASE_URL = "https://kauth.kakao.com";
+    private readonly string _clientId;
+    private readonly string _clientSecret;
+    private readonly string _redirectUri;
+    
+    public KakaoService(HttpClient httpClient, IConfiguration configuration)
+    {
+        _httpClient = httpClient;
+        _clientId = configuration["Kakao:ClientId"] ?? throw new InvalidOperationException("Kakao:ClientId not configured");
+        _redirectUri = configuration["Kakao:RedirectUri"] ?? throw new InvalidOperationException("Kakao:RedirectUri not configured");
+        _clientSecret = configuration["Kakao:ClientSecret"] ?? throw new InvalidOperationException("Kakao:ClientSecret not configured");
+    }
+    
+    private void SetHeaders(string accessToken)
+    {
+        _httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
+        _httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
+    }
+    private async Task<string> Call(HttpMethod method, string url, HttpContent? content = null)
+    {
+        try
+        {
+            var request = new HttpRequestMessage(method, url);
+            if (content != null)
+            {
+                request.Content = content;
+            }
+
+            var response = await _httpClient.SendAsync(request);
+            var responseContent = await response.Content.ReadAsStringAsync();
+
+            if (!response.IsSuccessStatusCode)
+            {
+                return JsonSerializer.Serialize(new { error = $"HTTP {(int)response.StatusCode}: {responseContent}" });
+            }
+
+            return responseContent;
+        }
+        catch (Exception ex)
+        {
+            return JsonSerializer.Serialize(new { error = ex.Message });
+        }
+    }
+    
+    public async Task<string> GetAccessToken(string code)
+    {
+        var content = new FormUrlEncodedContent(new[]
+        {
+            new KeyValuePair<string, string>("grant_type", "authorization_code"),
+            new KeyValuePair<string, string>("client_id", _clientId),
+            new KeyValuePair<string, string>("redirect_uri", _redirectUri),
+            new KeyValuePair<string, string>("code", code),
+            new KeyValuePair<string, string>("client_secret", _clientSecret)
+        });
+        content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
+
+        var response = await Call(HttpMethod.Post, $"{KAKAO_AUTH_BASE_URL}/oauth/token", content);
+        var responseData = JsonSerializer.Deserialize<JsonElement>(response);
+            
+        if (responseData.TryGetProperty("error", out var error))
+        {
+            return response;
+        }
+
+        if (!responseData.TryGetProperty("access_token", out var accessToken))
+        {
+            return JsonSerializer.Serialize(new { error = "Access token is missing from response" });
+        }
+                
+        return JsonSerializer.Serialize(new { access_token = accessToken.GetString() });
+    }
+    
+    public Task<string> GetAuthorizationUrl(string scope)
+    {
+        var authUrl = $"{KAKAO_AUTH_BASE_URL}/oauth/authorize?client_id={_clientId}&redirect_uri={_redirectUri}&response_type=code";
+        if (!string.IsNullOrEmpty(scope))
+        {
+            authUrl += $"&scope={scope}";
+        }
+        return Task.FromResult(authUrl);
+    }
+    
+    public async Task<(bool Success, string Response)> Redirect(string code)
+    {
+        if (string.IsNullOrEmpty(code))
+            return (false, JsonSerializer.Serialize(new { error = "Authorization code not found" }));
+
+        var response = await GetAccessToken(code);
+        var responseData = JsonSerializer.Deserialize<JsonElement>(response);
+            
+        if (responseData.TryGetProperty("error", out var error))
+        {
+            return (false, response);
+        }
+
+        var accessToken = responseData.GetProperty("access_token").GetString();
+        if (string.IsNullOrEmpty(accessToken))
+        {
+            return (false, response);
+        }
+
+        return (true, accessToken);
+    }
+
+    public async Task<(bool Success, string Response)> Logout(string accessToken)
+    {
+        if (string.IsNullOrEmpty(accessToken))
+            return (false, JsonSerializer.Serialize(new { error = "Not logged in" }));
+
+        SetHeaders(accessToken);
+        var response = await Call(HttpMethod.Post, $"{KAKAO_API_BASE_URL}/v1/user/logout");
+        return (true, response);
+    }
+
+    public async Task<(bool Success, string Response)> Unlink(string accessToken)
+    {
+        if (string.IsNullOrEmpty(accessToken))
+            return (false, JsonSerializer.Serialize(new { error = "Not logged in" }));
+
+        SetHeaders(accessToken);
+        var response = await Call(HttpMethod.Post, $"{KAKAO_API_BASE_URL}/v1/user/unlink");
+        return (true, response);
+    }
+}