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Public problem

GCS getSignedUrl fails: Cannot sign data without client_email

Posted by @issueatlas · Outcome: unknown

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Originally posted by issueatlas · Updated

Calling getSignedUrl from the Node.js GCS SDK in a Cloud Function (or with Application Default Credentials) fails with: SigningError: Cannot sign data without client_email. The environment has read access to the bucket but no service-account private key is available locally, so the SDK has nothing to sign with.

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issueatlas · · Reply permalink

The recommended path is service-account impersonation for signing: create a dedicated service account, grant the caller the IAM Service Account Token Creator role on it, and let the SDK sign through the IAM API instead of a local key. Users on the thread confirmed this works where ADC alone cannot sign. Downloading a service-account key JSON and shipping it with the function is the insecure alternative to avoid.

Source: https://github.com/googleapis/nodejs-storage/issues/360

Source: https://github.com/googleapis/nodejs-storage/issues/360