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secret_manager.go
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secret_manager.go
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package gcp
import (
"encoding/base64"
"fmt"
"io"
secretmanager "cloud.google.com/go/secretmanager/apiv1"
log "github.com/sirupsen/logrus"
"github.com/urfave/cli/v2"
"google.golang.org/api/option"
secretmanagerpb "google.golang.org/genproto/googleapis/cloud/secretmanager/v1"
"github.com/markeissler/injector/pkg/stringutil"
)
// FetchSecretDocument retrieves the secret manager document specified in cli arguments and writes the contents to the
// specified io.Writer. The `latest` version will be retrieved if no version has been specified.
func FetchSecretDocument(ctx *cli.Context, writer io.Writer) error {
var client *secretmanager.Client
var err error
// Set the secret manager Client option for reading credentials from a file.
clientOptions := make([]option.ClientOption, 0)
if !stringutil.IsBlank(ctx.String("key-file")) {
clientOptions = append(clientOptions, option.WithCredentialsFile(ctx.String("key-file")))
} else if !stringutil.IsBlank(ctx.String("key-value")) {
var jsonBytes []byte
jsonBytes, err = base64.StdEncoding.DecodeString(ctx.String("key-value"))
if err != nil {
return fmt.Errorf("failed to decode secretmanager service account key value: %v", err)
}
clientOptions = append(clientOptions, option.WithCredentialsJSON(jsonBytes))
}
// Create the secret manager Client.
if client, err = secretmanager.NewClient(ctx.Context, clientOptions...); err != nil {
return fmt.Errorf("failed to create secretmanager client: %v", err)
}
defer func() {
if err = client.Close(); err != nil {
log.Println("error encountered while cleaning up secretManager.Client")
}
}()
// Build the request.
secretVersion := "latest"
if !stringutil.IsBlank(ctx.String("secret-version")) {
secretVersion = ctx.String("secret-version")
}
secretName := fmt.Sprintf("projects/%s/secrets/%s/versions/%s", ctx.String("project"), ctx.String("secret-name"), secretVersion)
request := &secretmanagerpb.AccessSecretVersionRequest{
Name: secretName,
}
// Call the API.
var result *secretmanagerpb.AccessSecretVersionResponse
if result, err = client.AccessSecretVersion(ctx.Context, request); err != nil {
return fmt.Errorf("failed to access secret version: %v", err)
}
// Write the contents to the io.Writer.
if _, err = fmt.Fprintf(writer, "%s\n", string(result.Payload.Data)); err != nil {
return err
}
return nil
}