CkAuthGoogle Java Reference Documentation


Current Version:

Provides functionality for authenticating calls to the Google Cloud Platform API and Google Apps API using a service account.

Object Creation

CkAuthGoogle obj = new CkAuthGoogle();


void get_AccessToken(CkString str);
String accessToken();
void put_AccessToken(String newVal);
Introduced in version

The access token to be used in Google API requests. This property is set on a successful call to ObtainAccessToken.

<b>Important:</b> This class is used for authenticating calls to the Google Cloud Platform API and Google Apps API using a <b>service account.</b>. 
For 3-legged OAuth2, where a browser must be used to interactively get permission from the Google account owner, use the Chilkat OAuth2 class/object.

void get_DebugLogFilePath(CkString str);
String debugLogFilePath();
void put_DebugLogFilePath(String newVal);

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

void get_EmailAddress(CkString str);
String emailAddress();
void put_EmailAddress(String newVal);
Introduced in version

The client email address of the service account. If a JSON key is used, then the client_email should already be specified within the JSON key, and this property is unused. This property must be set if using a P12 key.

int get_ExpireNumSeconds();
void put_ExpireNumSeconds(int newVal);
Introduced in version

The expiration time, in seconds, of the access token to be requested. The maximum value is 1 hour (3600 seconds). The default value is 3600.

int get_Iat();
void put_Iat(int newVal);
Introduced in version

This property can be set to override the default current date/time value for the "iat" claim of the JWT. It can be set to a value indicating the number of seconds from 1970-01-01T00:00:00Z UTC.

The default value is 0, which indicates to use the iat value for the current system date/time. Unless explicitly needed, always leave this property at the default value.

void get_JsonKey(CkString str);
String jsonKey();
void put_JsonKey(String newVal);
Introduced in version

The JSON key for obtaining an access token. An application must set either the P12 or JSON private key, but not both.

void get_LastErrorHtml(CkString str);
String lastErrorHtml();

Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

void get_LastErrorText(CkString str);
String lastErrorText();

Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

void get_LastErrorXml(CkString str);
String lastErrorXml();

Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

boolean get_LastMethodSuccess();
void put_LastMethodSuccess(boolean newVal);
Introduced in version

Indicate whether the last method call succeeded or failed. A value of true indicates success, a value of false indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

  • Any method that returns a string.
  • Any method returning a Chilkat object, binary bytes, or a date/time.
  • Any method returning a standard boolean status value where success = true and failure = false.
  • Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to true. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

int get_NumSecondsRemaining();
Introduced in version

If the access token is valid, contains the number of seconds remaining until it expires. A value of 0 indicates an invalid or expired access token.

void get_Scope(CkString str);
String scope();
void put_Scope(String newVal);
Introduced in version

A space-delimited list of the permissions that the application requests.

void get_SubEmailAddress(CkString str);
String subEmailAddress();
void put_SubEmailAddress(String newVal);
Introduced in version

The email address of the user for which the application is requesting delegated access.

boolean get_Valid();
Introduced in version

true if the AccessToken property contains a valid non-expired access token obtained via the call to ObtainAccessToken.

boolean get_VerboseLogging();
void put_VerboseLogging(boolean newVal);

If set to true, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is false. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

void get_Version(CkString str);
String version();

Version of the component/library, such as ""



CkPfx GetP12();
Introduced in version

Returns the private key in a PFX (P12) object. This is only possible if the private key was previously set by calling SetP12.

Returns nil on failure

boolean ObtainAccessToken(CkSocket connection);
Introduced in version

Sends the HTTP request to fetch the access token. When this method completes successfully, the access token is available in the AccessToken property. The connection is an existing connection to

Important: Make sure your computer's date/time is accurately set to the current date/time, otherwise you'll get a 400 response status code with this error: "Invalid JWT: Token must be a short-lived token (60 minutes) and in a reasonable timeframe. Check your iat and exp values and use a clock with skew to account for clock differences between systems.".

Returns true for success, false for failure.

ObtainAccessTokenAsync (Android™) (Java)
CkTask ObtainAccessTokenAsync(CkSocket connection);
Introduced in version

Creates an asynchronous task to call the ObtainAccessToken method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns nil on failure

boolean SaveLastError(String path);

Saves the last-error information (the contents of LastErrorXml) to an XML formatted file.

Returns true for success, false for failure.

boolean SetP12(CkPfx key);
Introduced in version

Sets the P12 private key to be used for obtaining an access token. An application must set either the P12 or JSON private key, but not both.

Returns true for success, false for failure.



Chilkat supports event callbacks in Java (including Android) starting in version To implement an event callback, your application would define and implement a class that derives from CkBaseProgress. Your application can implement methods to override some or all of the default/empty method implementations of the CkBaseProgress base class.

For example:

// Install an event callback handler to get progress events.
MyBaseProgress authgoogleProgress = new MyBaseProgress();

MyBaseProgress example:

import com.chilkatsoft.CkBaseProgress;
import com.chilkatsoft.CkTask;

public class MyBaseProgress extends CkBaseProgress 
  public boolean AbortCheck()
    // Return true to abort, false to allow the method to continue.
    return false;
  // pctDone is a value from 0 to 100
  // (it is actually value from 0 to the PercentDoneScale property setting)
  public boolean PercentDone(int pctDone)
    // Return true to abort, false to allow the method to continue.
    // Note: A PercentDone event is the equivalent of an AbortCheck.  
    // When PercentDone events are frequently firing, AbortCheck events are suppressed.
    // AbortCheck events will fire when the time between PercentDone events is longer 
    // than the HeartbeatMs property setting.
    return false;
  public void ProgressInfo(String name, String value)
    System.out.println(name + ": " + value);
  public void TaskCompleted(CkTask task)
     System.out.println("task completed!");
public boolean AbortCheck();

Provides the opportunity for a method call to be aborted. The AbortCheck event is fired periodically based on the value of the HeartbeatMs property. If HeartbeatMs is 0, then no AbortCheck events will fire. As an example, to fire 5 AbortCheck events per second, set the HeartbeatMs property equal to 200. Return true to abort; return false to continue (not abort)

public boolean PercentDone(int pctDone);

Provides the percentage completed for any method that involves network communications or time-consuming processing (assuming it is a method where a percentage completion can be measured). This event is only fired when it is possible to know a percentage completion, and when it makes sense to express the operation as a percentage completed. The pctDone argument will have a value from 1 to 100. For operations (Chilkat method calls) that complete very quickly, the number of PercentDone callbacks will vary, but the final callback should have a value of 100. For long running operations, no more than one callback per percentage point will occur (for example: 1, 2, 3, ... 98, 99, 100).

The PercentDone callback counts as an AbortCheck event. For method calls that complete quickly such that PercentDone events fire, it may be that AbortCheck events don't fire because the opportunity to abort is already provided in the PercentDone callback. For time consuming operations, where the amount of time between PercentDone callbacks are long, AbortCheck callbacks may be used to allow for the operation to be aborted in a more responsive manner.

Return true to abort; return false to continue (not abort)

public void ProgressInfo(String name, String value);

A general name/value event that provides information about what is happening during a method call. To find out what information is available, write code to handle this event and log the name/value pairs. Most are self-explanatory.

public void TaskCompleted(CkTask task);

Called in the background thread when an asynchronous task completes.