Update JwtBearerTokenFlow.java

[borisovkalin]

Added additional setter for an opaque token responses.

[cla-assistant]

All committers have signed the CLA.

[finkmanAtSap]

Hi Kalin, thanks for your contribution.

Can you please make the following changes?

• change method to "setOpaqueTokenFormat(boolean opaque)" that allows both enabling or disabling the opaque format similiar to disableCache(boolean) that is already there.
• add a unit test here

  cloud-security-services-integration-library/token-client/src/test/java/com/sap/cloud/security/xsuaa/tokenflows/JwtBearerTokenFlowTest.java

  Line 129 in dd16f75

  @Test

  for the new method that verifies that the optionalParameters contains the correct setting after using the method
• add a constant for "token_format" similar to "token_type" here: https://github.com/SAP/cloud-security-xsuaa-integration/blob/e5f4196a9f88d207b43664e421f88bbf56969d06/token-client/src/main/java/com/sap/cloud/security/xsuaa/client/OAuth2TokenServiceConstants.java#L17
• use the constant in your code and in addition in the two places where "token_format" has been hard-coded before: https://github.com/SAP/cloud-security-xsuaa-integration/blob/e5f4196a9f88d207b43664e421f88bbf56969d06/token-client/src/test/java/com/sap/cloud/security/xsuaa/client/XsuaaOAuth2TokenServiceJwtBearerTokenTest.java#L131
  https://github.com/SAP/cloud-security-xsuaa-integration/blob/e5f4196a9f88d207b43664e421f88bbf56969d06/token-client/src/test/java/com/sap/cloud/security/xsuaa/client/XsuaaOAuth2TokenServicePasswordTest.java#L146

Thanks!
Manuel

[finkmanAtSap]

Thanks for your changes. Looks very good. Just one small thing. Then I would like to merge it:
Can you please add one more assertion to the unit test that by default (if setOpaqueTokenFormat was not called yet), it does not contain the token_format key = opaque entry?
And likewise, at the end of the method, add the same assertion after calling setOpaqueTokenFormat(false) after having called setOpaqueTokenFormat(true) before?

[finkmanAtSap]

Perfect, thank you for the adjustments!