[KAKAO] 계정 로그인 API 연동 (2)

1. AccessToken 처리

/**
	 * KAKAO AccessToken 처리
	 * @param authorize_code
	 * @return
	 */
	@Override
	public String getKakaoAccessToken (String authorize_code) {
			
			String access_Token = "";
	        //String refresh_Token = "";
	        String reqURL = "https://kauth.kakao.com/oauth/token";
	        
	        try {
	            URL url = new URL(reqURL);
	            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
	            
	            //POST 요청을 위해 기본값이 false인 setDoOutput을 true로
	            conn.setRequestMethod("POST");
	            conn.setDoOutput(true);
	            //POST 요청에 필요로 요구하는 파라미터 스트림을 통해 전송
	            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(conn.getOutputStream()));
	            StringBuilder sb = new StringBuilder();
	            sb.append("grant_type=authorization_code");
	            sb.append("&client_id=client_id");
	            sb.append("&redirect_uri=redirect_uri");
	            sb.append("&code="+authorize_code);
	            sb.append("&state=url Parameter");
	            bw.write(sb.toString());
	            bw.flush();
	            
	            //결과 코드가 200이라면 성공
	            int responseCode = conn.getResponseCode();
	 
	            //요청을 통해 얻은 JSON타입의 Response 메세지 읽어오기
	            BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
	            String line = "";
	            String result = "";
	            
	            while ((line = br.readLine()) != null) {
	                result += line;
	            }
	            
	            //Gson 라이브러리에 포함된 클래스로 JSON파싱 객체 생성
	            JsonParser parser = new JsonParser();
	            JsonElement element = parser.parse(result);
	            
	            access_Token = element.getAsJsonObject().get("access_token").getAsString();
	            //refresh_Token = element.getAsJsonObject().get("refresh_token").getAsString();
	            
	            br.close();
	            bw.close();
	        } catch (IOException e) {
	            e.printStackTrace();
	        } 
	        
	        return access_Token;
	    }

2. KAKAO 유저정보

/**
	 * KAKAO USER INFO
	 * @param access_Token
	 */
	@Override
	public void getKaKaoUserInfo (String access_Token) {
	    //요청하는 클라이언트마다 가진 정보가 다를 수 있기에 HashMap타입으로 선언
	    HashMap<String, Object> kakaoUserInfo = new HashMap<>();
	    String reqURL = "https://kapi.kakao.com/v2/user/me";
	    try {
	        URL url = new URL(reqURL);
	        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
	        conn.setRequestMethod("POST");
	        
	        //요청에 필요한 Header에 포함될 내용
	        conn.setRequestProperty("Authorization", "Bearer " + access_Token);
	        
	        //int responseCode = conn.getResponseCode();
	        
	        BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));
	        
	        String line = "";
	        String result = "";
	        
	        while ((line = br.readLine()) != null) {
	            result += line;
	        }
	        System.out.println("response body : " + result);
	        
	        JsonParser parser = new JsonParser();
	        JsonElement element = parser.parse(result);
	        
	        JsonObject properties = element.getAsJsonObject().get("properties").getAsJsonObject();
	        JsonObject kakao_account = element.getAsJsonObject().get("kakao_account").getAsJsonObject();
	        
	        String nickname = properties.getAsJsonObject().get("nickname").getAsString();
	        String email = kakao_account.getAsJsonObject().get("email").getAsString();
	        String id = "KAKAO_"+element.getAsJsonObject().get("id").toString();
	        
	        kakaoUserInfo.put("nickname", nickname);
	        kakaoUserInfo.put("email", email);
	        kakaoUserInfo.put("id", id);
	        
		    System.out.println("login Controller : " + kakaoUserInfo);
		    
	    } catch (IOException e) {
	        e.printStackTrace();
	    }
	}

3.Controller

	/** 
    * sns Login 
    */ 
    @RequestMapping( "/index" ) 
    public String view(
    	ModelMap model ) { 
        String kakaoUrl = "https://kauth.kakao.com/oauth/authorize?client_id=client_id&redirect_uri=redorect_uri&response_type=code&state=url_parameter";
        model.addAttribute( "kakaoUrl", kakaoUrl ); 
        return "/index"; 
     }



	/**
	 * KAKAO Login 
	 * @param code
	 * @throws IOException 
	 */
	@RequestMapping( "/kakaoLogin" )
	public void  kakaoLogin(
			@RequestParam("code") String code,
			HttpServletResponse response) throws IOException {
		String access_Token = snsLoginService.getAccessToken(code);
		
		String referer = (String)request.getHeader("REFERER")!=null? (String)request.getHeader("REFERER") : "http://localhost:8080";
		
		snsLoginService.getUserInfo(access_Token);
		
		response.setContentType("text/html; charset=UTF-8");
        PrintWriter out = response.getWriter();
        //Login Popup창 닫고 page referer url로 새로고침
        out.println("<script>window.close(); opener.parent.location="+"'"+referer+"'"+";</script>");
        out.flush();
	}

4. index.jsp

<a id="custom-login-btn" href="javascript:void(0);" onclick="window.open('${kakaoUrl}','kakaoLogin','width=430,height=500,location=no,status=no,scrollbars=yes');"">
	<img src="//mud-kage.kakao.com/14/dn/btqbjxsO6vP/KPiGpdnsubSq3a0PHEGUK1/o.jpg" width="300"/>
</a>