[feat] 모바일 웹 리다이렉트 분리 강화

Back-end/src/main/java/com/example/backend/user/kakao/controller/KakaoController.java

@@ -27,8 +27,10 @@ public class KakaoController {
     )
     @ApiResponse(responseCode = "302", description = "카카오 로그인 페이지로 리디렉션됨")
     @GetMapping("/login")
-    public void redirectToKakao(HttpServletResponse response) throws IOException {
-        String kakaoAuthUrl = kakaoService.getKakaoAuthUrl();
+    public void redirectToKakao(
+            @Parameter(description = "모바일 앱 여부") @RequestParam(value = "mobile", required = false, defaultValue = "false") boolean mobile,
+            HttpServletResponse response) throws IOException {
+        String kakaoAuthUrl = kakaoService.getKakaoAuthUrl(mobile);
         response.sendRedirect(kakaoAuthUrl);
     }
 

Back-end/src/main/java/com/example/backend/user/kakao/service/KakaoService.java

@@ -28,23 +28,32 @@ public class KakaoService {
     @Value("${kakao.redirectUri}")
     private String redirectUri;
 
-    public String getKakaoAuthUrl() {
+    @Value("${kakao.mobileRedirectUri}")
+    private String mobileRedirectUri;
+
+    public String getKakaoAuthUrl(boolean mobile) {
+        String targetRedirectUri = mobile ? mobileRedirectUri : redirectUri;
         return "https://kauth.kakao.com/oauth/authorize?response_type=code"
                 + "&client_id=" + restApiKey
-                + "&redirect_uri=" + redirectUri
+                + "&redirect_uri=" + targetRedirectUri
                 + "&scope=account_email,profile_nickname,profile_image";
     }
 
     public ResponseEntity<KakaoResponse.loginResponse> getUserInfo(String code) {
+        return getUserInfo(code, false);
+    }
+
+    public ResponseEntity<KakaoResponse.loginResponse> getUserInfo(String code, boolean mobile) {
         try {
             RestTemplate restTemplate = new RestTemplate();
+            String targetRedirectUri = mobile ? mobileRedirectUri : redirectUri;
 
             HttpHeaders headers = new HttpHeaders();
             headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
             MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
             params.add("grant_type", "authorization_code");
             params.add("client_id", restApiKey);
-            params.add("redirect_uri", redirectUri);
+            params.add("redirect_uri", targetRedirectUri);
             params.add("code", code);
 
             HttpEntity<MultiValueMap<String, String>> tokenRequest = new HttpEntity<>(params, headers);