Add support for CLOUD_SDK_ACCESS_TOKEN_PATH #775
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This commit adds support for configuring the collector to authenticate with a token source that comes from a file defined by the CLOUD_SDK_ACCESS_TOKEN_PATH environment variable. When the token expires, the token source will refresh by reading the file again. Optionally the user can set CLOUD_SDK_ACCESS_TOKEN_EARLY_EXPIRY to control when the refresh occurs. The gcloud CLI has support for authenticating with user-supplied access tokens. See: https://issuetracker.google.com/issues/134539464#comment12 This is useful when credentials need to be generated dynamically from some centralized system that passes these scoped short-lived credentials to untrusted systems which use them to authenticate with GCP services (instead of having the untrusted system generate the credentals with some base/root credentials).
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This commit adds support for configuring the collector to authenticate with a token source that comes from a file defined by the CLOUD_SDK_ACCESS_TOKEN_PATH environment variable.
When the token expires, the token source will refresh by reading the file again. Optionally the user can set CLOUD_SDK_ACCESS_TOKEN_EARLY_EXPIRY to control when the refresh occurs.
The gcloud CLI has support for authenticating with user-supplied access tokens. See: https://issuetracker.google.com/issues/134539464#comment12
This is useful when credentials need to be generated dynamically from some centralized system that passes these scoped short-lived credentials to untrusted systems which use them to authenticate with GCP services (instead of having the untrusted system generate the credentals with some base/root credentials).