Function idFromCert

internal/credentials/spiffe/spiffe.go:94–107

idFromCert parses the SPIFFE ID from the x509.Certificate. If the certificate does not have a valid SPIFFE ID, returns an error.

(cert *x509.Certificate)

// idFromCert parses the SPIFFE ID from the x509.Certificate. If the certificate
// does not have a valid SPIFFE ID, returns an error.
func idFromCert(cert *x509.Certificate) (*spiffeid.ID, error) {
	if cert == nil {
		return nil, fmt.Errorf("input cert is nil")
	}
	// A valid SPIFFE Certificate should have exactly one URI.
	if len(cert.URIs) != 1 {
		return nil, fmt.Errorf("input cert has %v URIs but should have 1", len(cert.URIs))
	}
	id, err := spiffeid.FromURI(cert.URIs[0])
	if err != nil {
		return nil, fmt.Errorf("invalid spiffeid: %v", err)
	}
	return &id, nil
}