Support GCP authentication

Example/Lambda/go.mod

@@ -1,10 +1,10 @@
-module github.com/akeylesslabs/akeyless-go-cloud-id
+module github.com/akeylesslabs/akeyless-go-cloud-id/example/lambda
 
 go 1.13
 
 require (
+	github.com/akeylesslabs/akeyless-go-cloud-id v0.2.1
 	github.com/akeylesslabs/akeyless-go-sdk v0.1.6
 	github.com/antihax/optional v1.0.0
 	github.com/aws/aws-lambda-go v1.17.0
-	github.com/aws/aws-sdk-go-v2 v0.23.0
 )

Example/Lambda/go.sum

@@ -0,0 +1,46 @@
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+github.com/akeylesslabs/akeyless-go-cloud-id v0.2.1/go.mod h1:5LCtwSIO0gC8r41XkBLtLkWc05JqRQ6/QxECVgcP4T8=
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+github.com/aws/aws-lambda-go v1.17.0 h1:Ogihmi8BnpmCNktKAGpNwSiILNNING1MiosnKUfU8m0=
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cloudprovider/gcp/cloud_id.go

@@ -0,0 +1,27 @@
+package gcp
+
+import (
+	"context"
+	"encoding/base64"
+	"fmt"
+
+	"google.golang.org/api/idtoken"
+)
+
+func GetCloudID(audience string) (string, error) {
+	signedJWT, err := idtoken.NewTokenSource(context.Background(), audience)
+	if err != nil {
+		return "", fmt.Errorf("failed to retrieve signed JWT: %w", err)
+	}
+
+	t, err := signedJWT.Token()
+	if err != nil {
+		return "", fmt.Errorf("signed JWT is not available: %w", err)
+	}
+
+	if !t.Valid() {
+		return "", fmt.Errorf("signed JWT is invalid")
+	}
+
+	return base64.StdEncoding.EncodeToString([]byte(t.AccessToken)), nil
+}

go.mod

@@ -2,4 +2,7 @@ module github.com/akeylesslabs/akeyless-go-cloud-id
 
 go 1.13
 
-require github.com/aws/aws-sdk-go-v2 v0.23.0
+require (
+	github.com/aws/aws-sdk-go-v2 v0.23.0
+	google.golang.org/api v0.45.0
+)