Dropbox OAuth 2.0 Scribe Java Example

Dropbox OAuthServiceConfig and OAuthServiceProvider Bean

<bean id="dropboxServiceConfig" class="com.example.oauth.OAuthServiceConfig">
		<constructor-arg value="xxx" />
		<constructor-arg value="xxx"/>
		<constructor-arg value="https://www.example.com/oauth/dropbox"/>
		<constructor-arg value="com.example.oauth.DropBoxApi20"/>
	</bean>
	<bean id="dropboxServiceProvider" class="com.example.oauth.OAuthServiceProvider">
		<constructor-arg name="config" ref="dropboxServiceConfig" />
	</bean>

Dropbox OAuth Spring MVC Controller

package com.example.oauth.controller;
import static org.springframework.web.context.request.RequestAttributes.SCOPE_SESSION;
import java.util.Map;
import javax.servlet.http.HttpSession;
import org.scribe.model.Token;
import org.scribe.model.Verifier;
import org.scribe.oauth.OAuthService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.context.request.WebRequest;
import com.example.oauth.OAuthServiceProvider;
@Controller
@RequestMapping("/oauth/dropbox")
public class DropboxController {
	@Autowired
	@Qualifier("dropboxServiceProvider")
	private OAuthServiceProvider dropboxServiceProvider;
	private static final Token EMPTY_TOKEN = null;
	@RequestMapping(value = "/login-dropbox", method = RequestMethod.GET)
	public String loginToDropBox(Map<String, Object> map, WebRequest request) {
		OAuthService service = dropboxServiceProvider.getService();
		String authUrl = service.getAuthorizationUrl(EMPTY_TOKEN);
		System.out.println("RequestToken: " + authUrl);
		return "redirect:" + authUrl;
	}
	@RequestMapping(value = { "" }, method = RequestMethod.GET)
	public String callback(
			@RequestParam(value = "oauth_token", required = false) String oauthToken,
			@RequestParam(value = "code", required = false) String oauthVerifier,
			WebRequest request, Map<String, Object> map) {
		OAuthService service = dropboxServiceProvider.getService();
		// getting access token
		Verifier verifier = new Verifier(oauthVerifier);
		Token accessToken = service.getAccessToken(EMPTY_TOKEN, verifier);
		// store access token as a session attribute
		request.setAttribute("oauthAccessToken", accessToken, SCOPE_SESSION);
		ServletRequestAttributes attr = (ServletRequestAttributes) RequestContextHolder
				.currentRequestAttributes();
		HttpSession session = attr.getRequest().getSession(false); // create a
																	// new
																	// session
		session.setAttribute("accessToken", accessToken);
		return "settings";
	}
}

DropBoxApi20 extends DefaultApi20

package com.example.oauth;
import org.scribe.builder.api.DefaultApi20;
import org.scribe.extractors.AccessTokenExtractor;
import org.scribe.extractors.JsonTokenExtractor;
import org.scribe.model.OAuthConfig;
import org.scribe.model.Verb;
public class DropBoxApi20 extends DefaultApi20 {
	@Override
	public String getAccessTokenEndpoint() {
		return "https://api.dropbox.com/1/oauth2/token?grant_type=authorization_code";
	}
	@Override
	public String getAuthorizationUrl(OAuthConfig config) {
		// TODO Auto-generated method stub
		return String.format("https://www.dropbox.com/1/oauth2/authorize?client_id=%s&response_type=code&redirect_uri=%s", config.getApiKey(), config.getCallback());
	}
	 @Override
	 public Verb getAccessTokenVerb(){
	       return Verb.POST;
	 }
	@Override
    public AccessTokenExtractor getAccessTokenExtractor() {
        return new JsonTokenExtractor();
    }
}