Support for GCP secret manager

[jbialy]

Gomplate supports reading from the AWS parameter store using theaws+smp datasource. It would be great to also support the GCP secret manager, https://cloud.google.com/secret-manager/docs/managing-secrets.

[dontlaugh]

I had to implement a version of this that only fetches the latest version of a secret. I don't have time to pick this up, but I'll leave this here in case it helps anyone.

package secret

import (
	"context"
	"fmt"

	secretmanager "cloud.google.com/go/secretmanager/apiv1"
	secretmanagerpb "google.golang.org/genproto/googleapis/cloud/secretmanager/v1"
)

// Get ...
func Get(ctx context.Context, projectID, secretName string) ([]byte, error) {

	// Create the client.
	client, err := secretmanager.NewClient(ctx)
	if err != nil {
		return nil, err
	}

	vreq := secretmanagerpb.GetSecretVersionRequest{
		Name: fmt.Sprintf("projects/%s/secrets/%s/versions/latest", projectID, secretName),
	}
	v, err := client.GetSecretVersion(ctx, &vreq)
	if err != nil {
		return nil, err
	}

	req := secretmanagerpb.AccessSecretVersionRequest{
		Name: v.Name,
	}

	s, err := client.AccessSecretVersion(ctx, &req)
	if err != nil {
		return nil, err
	}

	return s.Payload.Data, nil
}

I think you have to get version metadata first. versions/latest is an alias to the latest version. With that fully-qualified name you can use AccessSecretVersion get the secret's contents as bytes.

[hairyhenderson]

Thanks @dontlaugh, that looks super helpful! 😁

[vtatarin]

@dontlaugh thank you for the snippet!
Waiting for Secret Manager to be added in the upcoming releases:)

[sthomson-wyn]

I'm going to take a crack at adding this, if that's OK

[github-actions]

This issue is stale because it has been open for 60 days with no activity. Remove stale label or comment or this will be automatically closed in a few days.

[hairyhenderson]

Relevant: #1633 (comment) - in short, I think GCP secret manager support should be added to https://github.com/hairyhenderson/go-fsimpl instead

[github-actions]

This issue is stale because it has been open for 60 days with no
activity. If it is no longer relevant or necessary, please close it.
Given no action, it will be closed in 14 days.

If it's still relevant, one of the following will remove the stale
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[hairyhenderson]

I've filed hairyhenderson/go-fsimpl#364, and when that's implemented (contributions accepted!) support will be available in gomplate. As no further action is necessary in gomplate, I'll close this issue.