fix: ensure credentials can be of type FetchAuthTokenInterface #2684
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Not directly related to the deprecation of file/string credentials - this is already only supported via ADC or service account / user account credentials in apiary, so there's no security concern.
However, during that audit, I found some issues with our implementation for a few functions - namely
CredentialsLoader
being used whereFetchAuthTokenInterface
should be used, and places where the wrong types could be supplied if used incorrectly (seeGuzzle6AuthHandler
).