[OAUTH2] 페이스북(facebook) OAuthCallbackListener 샘플

- Access Token 요청 (graph.facebook.com/oauth/access_token)

- 사용자 게시물 피드 조회 : /{user-id}/feed (graph.facebook.com/v2.5/me/feed)

	package com.example;
	import java.io.BufferedReader;
	import java.io.IOException;
	import java.io.InputStreamReader;
	import java.io.Reader;
	import java.net.URLEncoder;
	import java.nio.charset.StandardCharsets;
	import java.util.ArrayList;
	import java.util.List;
	import javax.servlet.ServletException;
	import javax.servlet.http.HttpServlet;
	import javax.servlet.http.HttpServletRequest;
	import javax.servlet.http.HttpServletResponse;
	import org.apache.commons.codec.binary.Base64;
	import org.apache.http.HttpEntity;
	import org.apache.http.HttpResponse;
	import org.apache.http.NameValuePair;
	import org.apache.http.client.entity.UrlEncodedFormEntity;
	import org.apache.http.client.methods.HttpPost;
	import org.apache.http.impl.client.CloseableHttpClient;
	import org.apache.http.impl.client.HttpClients;
	import org.apache.http.message.BasicNameValuePair;
	import org.apache.http.util.EntityUtils;
	import org.json.JSONObject;
	public class OAuthCallbackListener extends HttpServlet {
	private static final long serialVersionUID = 1L;
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {
	// Detect the presence of an authorization code
	String authorizationCode = request.getParameter("code");
	if (authorizationCode != null && authorizationCode.length() > 0) {
	final String TOKEN_ENDPOINT = "https://graph.facebook.com/oauth/access_token";
	final String GRANT_TYPE = "authorization_code";
	final String REDIRECT_URI = "https://www.test.com:8443/callback";
	final String CLIENT_ID = "CLIENT_ID";
	final String CLIENT_SECRET = "CLIENT_SECRET";
	HttpPost httpPost = new HttpPost(TOKEN_ENDPOINT
	+ "?grant_type=" + URLEncoder.encode(GRANT_TYPE, StandardCharsets.UTF_8.name())
	+ "&code=" + URLEncoder.encode(authorizationCode, StandardCharsets.UTF_8.name())
	+ "&redirect_uri=" + URLEncoder.encode(REDIRECT_URI, StandardCharsets.UTF_8.name())
	+ "&client_id=" + URLEncoder.encode(CLIENT_ID, StandardCharsets.UTF_8.name()));
	String clientCredentials = CLIENT_ID + ":" + CLIENT_SECRET;
	String encodedClientCredentials = new String(Base64.encodeBase64(clientCredentials.getBytes()));
	httpPost.setHeader("Authorization", "Basic " + encodedClientCredentials);
	CloseableHttpClient httpClient = HttpClients.createDefault();
	HttpResponse httpResponse = httpClient.execute(httpPost);
	HttpEntity entity = httpResponse.getEntity();
	String line = EntityUtils.toString(entity, "UTF-8");
	JSONObject jObject = new JSONObject(line);
	String accessToken = jObject.getString("access_token");
	System.out.println("accessToken: " + accessToken);
	String requestUrl = "https://graph.facebook.com/v2.5/me/feed?limit=25";
	httpClient = HttpClients.createDefault();
	httpPost = new HttpPost(requestUrl);
	httpPost.addHeader("Authorization", "Bearer " + accessToken);
	List<NameValuePair> urlParameters = new ArrayList<NameValuePair>();
	urlParameters.add(new BasicNameValuePair("method", "get"));
	httpPost.setEntity(new UrlEncodedFormEntity(urlParameters));
	httpResponse = httpClient.execute(httpPost);
	BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(httpResponse.getEntity().getContent()));
	String feedJson = bufferedReader.readLine();
	System.out.println("data: " + feedJson);
	httpClient.close();
	} else {
	}
	}
	}

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