fix: service account impersonation with workforce credentials #770
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oauth2_http/java/com/google/auth/oauth2/IdentityPoolCredentials.java
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oauth2_http/javatests/com/google/auth/oauth2/ExternalAccountCredentialsTest.java
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oauth2_http/java/com/google/auth/oauth2/IdentityPoolCredentials.java
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🤖 I have created a release \*beep\* \*boop\* --- ## [1.3.0](https://www.github.com/googleapis/google-auth-library-java/compare/v1.2.2...v1.3.0) (2021-11-10) ### Features * next release from main branch is 1.3.0 ([#780](https://www.github.com/googleapis/google-auth-library-java/issues/780)) ([1149581](https://www.github.com/googleapis/google-auth-library-java/commit/1149581e63267e3553c74ba2114d849c5b24f27b)) ### Bug Fixes * **java:** java 17 dependency arguments ([#1266](https://www.github.com/googleapis/google-auth-library-java/issues/1266)) ([#779](https://www.github.com/googleapis/google-auth-library-java/issues/779)) ([9160a53](https://www.github.com/googleapis/google-auth-library-java/commit/9160a53e6507c1c938795e181c65ad80db1bcf11)) * service account impersonation with workforce credentials ([#770](https://www.github.com/googleapis/google-auth-library-java/issues/770)) ([6449ef0](https://www.github.com/googleapis/google-auth-library-java/commit/6449ef0922053121a6732933ab9e246965fde3b7)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).
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While service account impersonation is not commonly used with workforce
pool configurations, there is a bug where the workforcePoolUserProject is not being set on the source credential.
This also lets us align with other languages who added the workforcePoolUserProject to the base class, instead of IdentityPoolCredentials (though it is the only one that currently supports it).
The bug itself is fixed by the refactor. By moving workforcePoolUserProject to be set in the base constructor, it is set before initializeImpersonatedCredentials() is called. A copy of the source credential is then made that has the workforcePoolUserProject set. Prior to this it was not set and the impersonation call resulted in a 403.