import from google reader

src/main/java/com/commafeed/frontend/pages/GoogleImportCallbackPage.java

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+package com.commafeed.frontend.pages;
+
+import javax.inject.Inject;
+import javax.servlet.http.HttpServletRequest;
+
+import org.apache.wicket.markup.html.WebPage;
+import org.apache.wicket.request.Url;
+import org.apache.wicket.request.UrlRenderer;
+import org.apache.wicket.request.cycle.RequestCycle;
+import org.apache.wicket.request.mapper.parameter.PageParameters;
+
+import com.commafeed.backend.dao.ApplicationSettingsService;
+import com.commafeed.backend.dao.UserService;
+import com.commafeed.backend.feeds.OPMLImporter;
+import com.commafeed.backend.model.ApplicationSettings;
+import com.commafeed.frontend.utils.WicketUtils;
+import com.commafeed.frontend.utils.exception.DisplayException;
+import com.google.api.client.auth.oauth2.AuthorizationCodeResponseUrl;
+import com.google.api.client.auth.oauth2.AuthorizationCodeTokenRequest;
+import com.google.api.client.auth.oauth2.BearerToken;
+import com.google.api.client.auth.oauth2.TokenResponse;
+import com.google.api.client.http.GenericUrl;
+import com.google.api.client.http.HttpRequest;
+import com.google.api.client.http.HttpTransport;
+import com.google.api.client.http.javanet.NetHttpTransport;
+import com.google.api.client.json.jackson2.JacksonFactory;
+
+@SuppressWarnings("serial")
+public class GoogleImportCallbackPage extends WebPage {
+
+	@Inject
+	ApplicationSettingsService applicationSettingsService;
+
+	@Inject
+	OPMLImporter importer;
+	@Inject
+	UserService userService;
+
+	private static final String TOKEN_URL = "https://accounts.google.com/o/oauth2/token";
+	private static final String EXPORT_URL = "https://www.google.com/reader/subscriptions/export";
+
+	public static String getCallbackUrl() {
+		RequestCycle cycle = RequestCycle.get();
+		UrlRenderer renderer = cycle.getUrlRenderer();
+		return renderer.renderFullUrl(Url.parse(cycle.urlFor(
+				GoogleImportCallbackPage.class, null).toString()));
+	}
+
+	public GoogleImportCallbackPage(PageParameters params) {
+
+		HttpServletRequest request = WicketUtils.getHttpServletRequest();
+		StringBuffer urlBuffer = request.getRequestURL();
+		if (request.getQueryString() != null) {
+			urlBuffer.append('?').append(request.getQueryString());
+		}
+		AuthorizationCodeResponseUrl responseUrl = new AuthorizationCodeResponseUrl(
+				urlBuffer.toString());
+		String code = responseUrl.getCode();
+
+		if (responseUrl.getError() != null) {
+			throw new DisplayException(responseUrl.getError());
+		} else if (code == null) {
+			throw new DisplayException("Missing authorization code");
+		} else {
+			ApplicationSettings settings = applicationSettingsService.get();
+			String redirectUri = getCallbackUrl();
+			String clientId = settings.getGoogleClientId();
+			String clientSecret = settings.getGoogleClientSecret();
+
+			HttpTransport httpTransport = new NetHttpTransport();
+			JacksonFactory jsonFactory = new JacksonFactory();
+
+			AuthorizationCodeTokenRequest tokenRequest = new AuthorizationCodeTokenRequest(
+					httpTransport, jsonFactory, new GenericUrl(TOKEN_URL), code);
+			tokenRequest.setRedirectUri(redirectUri);
+			tokenRequest.put("client_id", clientId);
+			tokenRequest.put("client_secret", clientSecret);
+			tokenRequest.setGrantType("authorization_code");
+
+			try {
+				TokenResponse tokenResponse = tokenRequest.execute();
+				String accessToken = tokenResponse.getAccessToken();
+
+				HttpRequest httpRequest = httpTransport.createRequestFactory()
+						.buildGetRequest(new GenericUrl(EXPORT_URL));
+				BearerToken.authorizationHeaderAccessMethod().intercept(
+						httpRequest, accessToken);
+				String opml = httpRequest.execute().parseAsString();
+				String state = responseUrl.getState();
+				importer.importOpml(userService.findById(Long.valueOf(state)),
+						opml);
+			} catch (Exception e) {
+				throw new DisplayException(e);
+			}
+		}
+		setResponsePage(getApplication().getHomePage());
+	}
+}

src/main/java/com/commafeed/frontend/pages/GoogleImportRedirectPage.java

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+package com.commafeed.frontend.pages;
+
+import java.net.URISyntaxException;
+
+import javax.inject.Inject;
+
+import org.apache.http.client.utils.URIBuilder;
+import org.apache.wicket.markup.html.WebPage;
+import org.apache.wicket.request.flow.RedirectToUrlException;
+import org.jboss.logging.Logger;
+
+import com.commafeed.backend.dao.ApplicationSettingsService;
+import com.commafeed.backend.model.ApplicationSettings;
+import com.commafeed.frontend.CommaFeedSession;
+
+@SuppressWarnings("serial")
+public class GoogleImportRedirectPage extends WebPage {
+
+	private static Logger log = Logger
+			.getLogger(GoogleImportRedirectPage.class);
+
+	private static final String SCOPE = "https://www.google.com/reader/subscriptions/export";
+	private static final String AUTH_URL = "https://accounts.google.com/o/oauth2/auth";
+
+	@Inject
+	ApplicationSettingsService applicationSettingsService;
+
+	public GoogleImportRedirectPage() {
+
+		ApplicationSettings settings = applicationSettingsService.get();
+
+		String clientId = settings.getGoogleClientId();
+
+		String redirectUri = GoogleImportCallbackPage.getCallbackUrl();
+		try {
+			URIBuilder builder = new URIBuilder(AUTH_URL);
+
+			builder.addParameter("redirect_uri", redirectUri);
+			builder.addParameter("response_type", "code");
+			builder.addParameter("scope", SCOPE);
+			builder.addParameter("approval_prompt", "force");
+			builder.addParameter("client_id", clientId);
+			builder.addParameter("state",
+					String.valueOf(CommaFeedSession.get().getUser().getId()));
+
+			throw new RedirectToUrlException(builder.build().toString());
+		} catch (URISyntaxException e) {
+			log.error(e.getMessage(), e);
+		}
+
+	}
+}