Add helper/schema.Provider.UserAgent helper.

Add a helper function to generate the suggested User-Agent header for
provider requests.

Author: paddycarver

helper/schema/provider.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/hashicorp/terraform-plugin-sdk/v2/diag"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/internal/configs/configschema"
+	"github.com/hashicorp/terraform-plugin-sdk/v2/meta"
 	"github.com/hashicorp/terraform-plugin-sdk/v2/terraform"
 )
 
@@ -426,3 +427,12 @@ func (p *Provider) DataSources() []terraform.DataSource {
 
 	return result
 }
+
+// UserAgent returns a string suitable for use in the User-Agent header of
+// requests generated by the provider. The generated string contains the
+// version of Terraform, the Plugin SDK, and the provider used to generate the
+// request. `name` should be the hyphen-separated reporting name of the
+// provider, and `version` should be the version of the provider.
+func (p *Provider) UserAgent(name, version string) string {
+	return fmt.Sprintf("Terraform/%s (+https://www.terraform.io) Terraform-Plugin-SDK/%s %s/%s", p.TerraformVersion, meta.SDKVersionString(), name, version)
+}