如何使我的Android应用使用“服务帐户”访问共享的Google日历？
作者：互联网
我认为答案是肯定的,但我不确定该怎么做.我一直在使用API从存储在设备上的日历中获取事件.例如
public static ArrayList<MINCalendarEvent> queryEvents(long startMillis, long endMillis) throws MINPermissionException
{
if ( ContextCompat.checkSelfPermission(MINMainActivity.getSharedInstance(), Manifest.permission.WRITE_CALENDAR) != PackageManager.PERMISSION_GRANTED )
{
throw new MINPermissionException(NO_PERMISSION);
}
else
{
ArrayList<MINCalendarEvent> eventArray = new ArrayList<MINCalendarEvent>();
Cursor cur = CalendarContract.Instances.query(MINMainActivity.getSharedInstance().getContentResolver(), EVENT_PROJECTION, startMillis, endMillis);
int numItems = cur.getCount();
Log.d("MINCalendarUtils.queryEvents", "Number of events retrieved: " + numItems);
while (cur.moveToNext())
{
MINCalendarEvent event = new MINCalendarEvent();
event.calendarID = cur.getLong(EVENT_PROJECTION_CALENDAR_ID);
event.organizer = cur.getString(EVENT_PROJECTION_ORGANIZER);
event.title = cur.getString(EVENT_PROJECTION_TITLE);
event.eventLocation = cur.getString(EVENT_PROJECTION_EVENT_LOCATION);
event.description = cur.getString(EVENT_PROJECTION_DESCRIPTION);
event.dtStart = cur.getLong(EVENT_PROJECTION_DTSTART);
event.dtEnd = cur.getLong(EVENT_PROJECTION_DTEND);
event.eventTimeZone = cur.getString(EVENT_PROJECTION_EVENT_TIMEZONE);
event.eventEndTimeZone = cur.getString(EVENT_PROJECTION_EVENT_END_TIMEZONE);
event.duration = cur.getString(EVENT_PROJECTION_DURATION);
event.allDay = (cur.getInt(EVENT_PROJECTION_ALL_DAY) != 0);
event.rRule = cur.getString(EVENT_PROJECTION_RRULE);
event.rDate = cur.getString(EVENT_PROJECTION_RDATE);
event.availability = cur.getInt(EVENT_PROJECTION_AVAILABILITY);
event.guestsCanModify = (cur.getInt(EVENT_PROJECTION_GUESTS_CAN_MODIFY) != 0);
event.guestsCanInviteOthers = (cur.getInt(EVENT_PROJECTION_GUESTS_CAN_INVITE_OTHERS) != 0);
event.guestsCanSeeGuests = (cur.getInt(EVENT_PROJECTION_GUESTS_CAN_SEE_GUESTS) != 0);
eventArray.add(event);
}
return eventArray;
}
}
这很好.问题是我需要查询用户也没有权限的服务器上存储的共享日历.我的应用程序创建了一个本地日历.我需要访问用户也将没有权限的共享,并将存储在共享日历中的事件与本地日历同步(不同步).我假设我可以使用服务帐户来访问共享日历.
我已经成功创建了一个服务帐户并将该帐户添加到共享日历中.怎么办？？？？
似乎有几种使用服务帐户访问日历事件的方法,但我完全感到困惑.显然,我想使用我一直在使用的API,但我认为它仅适用于与设备同步的日历.
我已经使用“ GoogleCredentials”进行了调查,但是我需要一些示例源代码来完成这项工作.首先,当我创建服务帐户时,我使用JSON而不是p12导出了该帐户.我看不到如何使用它.该API似乎需要p12.拥有凭证后,我也对如何使用凭证感到完全困惑.这是我开始的示例源：
//String emailAddress = "123456789000-abc123def456@developer.gserviceaccount.com";
GoogleCredential credential = null;
JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();
HttpTransport httpTransport = null;
try
{
httpTransport = GoogleNetHttpTransport.newTrustedTransport();
credential = new GoogleCredential.Builder()
.setTransport(httpTransport)
.setJsonFactory(JSON_FACTORY)
.setServiceAccountId(emailAddress)
.setServiceAccountPrivateKeyFromP12File(new File("MyProject.p12"))
.setServiceAccountScopes(Collections.singleton(SQLAdminScopes.SQLSERVICE_ADMIN))
.build();
}
catch (GeneralSecurityException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
有几个问题. 1)我无法将其编译.我似乎无法使导入工作：
import com.google.api.services.sqladmin.SQLAdminScopes;
假设我可以克服这个问题,那么现在.我不确定如何使用凭据访问远程日历.我需要从共享日历中获取事件列表.
我也一直在通过以下链接查看源代码中的说明,但未使用服务帐户：https://developers.google.com/google-apps/calendar/quickstart/android
此外,是否有办法将更改挂接到基于服务器的共享日历上,以便在共享日历发生更改时可以ping通？
有帮助吗？？？
编辑-工作代码
根据Andres的回答,我整理了以下代码：
public static void calendarAuthenticate()
{
Thread thread = new Thread(new Runnable()
{
@Override
public void run()
{
try
{
MINAppConfiguration appConfig = MINAppConfiguration.getSharedInstance();
// Application Name
appName = appConfig.getCurrentAppInfo().appName;
// Directory to store user credentials for this application;
//dataStoreDir = new File(appConfig.appDirectoryOnDevice);
// Instance of the JSON factory
jsonFactory = JacksonFactory.getDefaultInstance();
// Instance of the scopes required
scopes = new ArrayList<String>();
scopes.add(CalendarScopes.CALENDAR_READONLY);
// Http transport creation
httpTransport = AndroidHttp.newCompatibleTransport();
java.io.File licenseFile = getSecretFile();
GoogleCredential credential = new GoogleCredential.Builder()
.setTransport(httpTransport)
.setJsonFactory(jsonFactory)
.setServiceAccountId("account-1@handy-contact-762.iam.gserviceaccount.com")
.setServiceAccountScopes(scopes)
.setServiceAccountPrivateKeyFromP12File(licenseFile)
.build();
com.google.api.services.calendar.Calendar.Builder builder = new com.google.api.services.calendar.Calendar.Builder(httpTransport, jsonFactory, credential);
builder.setApplicationName(appName);
com.google.api.services.calendar.Calendar client = builder.build();
// List the next 10 events from the target calendar.
DateTime now = new DateTime(System.currentTimeMillis());
com.google.api.services.calendar.Calendar.Events.List list = client.events().list("mobilityinitiative.com_qfvbdrk368f9la06hacb4bduos@group.calendar.google.com");
list.setMaxAttendees(10);
list.setTimeMin(now);
list.setOrderBy("startTime");
list.setSingleEvents(true);
Events events = list.execute();
List<Event> items = events.getItems();
if (items.size() == 0)
{
Log.d(TAG, "No upcoming events found.");
}
else
{
Log.d(TAG, "Upcoming events");
for (Event event : items) {
DateTime start = event.getStart().getDateTime();
if (start == null) {
start = event.getStart().getDate();
}
Log.d(TAG, event.getSummary() + " (" + start + ")\n");
}
}
}
catch (GeneralSecurityException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
});
thread.start();
}
public static java.io.File getSecretFile()
{
File f = new File(MINMainActivity.getSharedInstance().getCacheDir()+ "/" +"google_calendar_secret.p12");
if (f.exists())
{
f.delete();
}
try
{
InputStream is = MINMainActivity.getSharedInstance().getAssets().open("google_calendar_secret.p12");
int size = is.available();
byte[] buffer = new byte[size];
is.read(buffer);
is.close();
FileOutputStream fos = new FileOutputStream(f);
fos.write(buffer);
fos.close();
}
catch (Exception e)
{
throw new RuntimeException(e);
}
return f;
}
一些注意事项：
>确保您正确创建了服务帐户,并且该帐户具有适当的权限：https://developers.google.com/identity/protocols/OAuth2ServiceAccount#delegatingauthority
>确保在后台线程中进行呼叫.如果尝试使用UI线程进行调用,它将失败.
>确保您将项目添加到日历,以便知道它正在工作:)
解决方法:
我不是Android专家,但是以下两种方法均适用于您的用例.
>您的方法：使用服务帐户,将避免让用户对您的应用程序进行身份验证.您可能需要阅读有关“ Delegating domain-wide authority”的信息,这将使您的应用程序可以以您域中的用户(也称为“模拟”用户)进行API调用.我还发现此SO会有所帮助.
>另一种方法：使用Acl.Insert资源.每次用户登录到您的应用程序时,这都需要用户身份验证.这是有关如何实现此功能的example.
从上面的示例源中,将范围设置为Calendar范围而不是SQL Admin,如下所示：
GoogleCredential credential = new GoogleCredential.Builder()
...
.setServiceAccountScopes(CalendarScopes.CALENDAR)
.setServiceAccountPrivateKeyFromP12File(xxxx)
.build();
希望这会有所帮助,祝你好运！
标签：google-calendar-api,android 来源： https://codeday.me/bug/20191027/1946031.html