Я использую код из Документов Google для управления календарем Google следующим образом.
public class CalendarQuickstart {
private static final String APPLICATION_NAME = "Google Calendar API Java Quickstart";
private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
private static final String CREDENTIALS_FOLDER = "credentials"; // Directory to store user credentials.
/**
* Global instance of the scopes required by this quickstart.
* If modifying these scopes, delete your previously saved credentials/ folder.
*/
private static final List<String> SCOPES = Collections.singletonList(CalendarScopes.CALENDAR_READONLY);
private static final String CLIENT_SECRET_DIR = "client_secret.json";
/**
* Creates an authorized Credential object.
* @param HTTP_TRANSPORT The network HTTP Transport.
* @return An authorized Credential object.
* @throws IOException If there is no client_secret.
*/
private static Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws IOException {
// Load client secrets.
InputStream in = CalendarQuickstart.class.getResourceAsStream(CLIENT_SECRET_DIR);
GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));
// Build flow and trigger user authorization request.
GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
.setDataStoreFactory(new FileDataStoreFactory(new java.io.File(CREDENTIALS_FOLDER)))
.setAccessType("offline")
.build();
return new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");
}
public static void main(String... args) throws IOException, GeneralSecurityException {
// Build a new authorized API client service.
final NetHttpTransport HTTP_TRANSPORT = GoogleNetHttpTransport.newTrustedTransport();
Calendar service = new Calendar.Builder(HTTP_TRANSPORT, JSON_FACTORY, getCredentials(HTTP_TRANSPORT))
.setApplicationName(APPLICATION_NAME)
.build();
// List the next 10 events from the primary calendar.
DateTime now = new DateTime(System.currentTimeMillis());
Events events = service.events().list("primary")
.setMaxResults(10)
.setTimeMin(now)
.setOrderBy("startTime")
.setSingleEvents(true)
.execute();
List<Event> items = events.getItems();
if (items.isEmpty()) {
System.out.println("No upcoming events found.");
} else {
System.out.println("Upcoming events");
for (Event event : items) {
DateTime start = event.getStart().getDateTime();
if (start == null) {
start = event.getStart().getDate();
}
System.out.printf("%s (%s)\n", event.getSummary(), start);
}
}
}
}
Я взял это и поместил в приложение Java на Google App Engine.Однако приложение не может записать учетные данные в каталог credentials, поскольку App Engine не разрешает запись на диск.
Один из способов преодолеть это - написать пользовательскую реализацию FileDataStoreFactory и сохранить учетные данные в Google Bucket.Это рекомендуемый appoarch?Насколько это безопасно?Есть ли лучшая альтернатива?