[#3] feat: kakao oauth 구현

src/main/java/com/gongjakso/server/global/security/kakao/KakaoClient.java

@@ -1,19 +1,72 @@
 package com.gongjakso.server.global.security.kakao;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.gongjakso.server.global.exception.ApplicationException;
+import com.gongjakso.server.global.security.kakao.dto.KakaoToken;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.MediaType;
 import org.springframework.stereotype.Component;
+import org.springframework.web.client.RestTemplate;
+import org.springframework.web.reactive.function.client.WebClient;
 
 @Slf4j
 @Component
 @RequiredArgsConstructor
 public class KakaoClient {
 
+    @Value("${spring.security.oauth2.client.provider.kakao.client-id}")
+    private String kakaoClientId;
+
+    @Value("${spring.security.oauth2.client.provider.kakao.client-secret}")
+    private String kakaoClientSecret;
+
+    @Value("${spring.security.oauth2.client.registration.authorization-grant-type")
+    private String kakaoGrantType;
+
+    @Value("${spring.security.oauth2.client.registration.clien}")
+
     @Value("${spring.security.oauth2.client.provider.kakao.authorization-uri}")
     private String kakaoAuthorizationUri;
 
-    public String getMemberInfo() {
+    @Value("${spring.security.oauth2.client.registration.redirect-uri}")
+    private String redirectUri;
+
+    public String getKakaoAccessToken() {
+        String accessToken = "";
 
+        WebClient webClient = WebClient.builder()
+                .baseUrl(kakaoAuthorizationUri) // 요청 할 API Url
+                .defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_FORM_URLENCODED_VALUE) // 헤더 설정
+                .build();
+
+        String response = webClient.post()
+                .uri(uriBuilder -> uriBuilder
+                        .queryParam("grant_type", kakaoGrantType)
+                        .queryParam("client_id", kakaoClientId)
+                        .queryParam("client_secret", kakaoClientSecret)
+                        .queryParam("redirect_uri", redirectUri)
+                        .queryParam("code", "code")
+                        .build())
+                .retrieve() // 데이터 받는 방식, 스프링에서는 exchange는 메모리 누수 가능성 때문에 retrieve 권장
+                .bodyToMono(String.class) // Mono 객체로 데이터를 받음 , Mono는 단일 데이터, Flux는 복수 데이터
+                .block();// 비동기 방식으로 데이터를 받아옴
+
+        ObjectMapper objectMapper = new ObjectMapper();
+
+        try {
+            KakaoToken kakaoToken = objectMapper.readValue(response, KakaoToken.class);
+        } catch (Exception e) {
+            throw new ApplicationException(E)
+        }
+
+        return null;
+    }
+    public String getMemberInfo() {
+        return null;
     }
 }
+//https://velog.io/@dab2in/Spring-boot-%EC%B9%B4%EC%B9%B4%EC%98%A4-%EC%86%8C%EC%85%9C-%EB%A1%9C%EA%B7%B8%EC%9D%B8

src/main/java/com/gongjakso/server/global/security/kakao/dto/KakaoMemberInfo.java

@@ -0,0 +1,4 @@
+package com.gongjakso.server.global.security.kakao.dto;
+
+public class KakaoMemberInfo {
+}

src/main/java/com/gongjakso/server/global/security/kakao/dto/KakaoToken.java

@@ -0,0 +1,7 @@
+package com.gongjakso.server.global.security.kakao.dto;
+
+import lombok.Builder;
+
+@Builder
+public record KakaoToken() {
+}