URL encode GCS file names

Signed-off-by: Modular Magician <magic-modules@google.com>

google-beta/data_source_google_storage_bucket_object.go

@@ -2,6 +2,8 @@ package google
 
 import (
 	"fmt"
+	"net/url"
+	"strings"
 
 	"github.com/hashicorp/terraform/helper/schema"
 )
@@ -24,6 +26,12 @@ func dataSourceGoogleStorageBucketObjectRead(d *schema.ResourceData, meta interf
 	bucket := d.Get("bucket").(string)
 	name := d.Get("name").(string)
 
+	// URL encode folder names, but to ensure backward compatibility don't url encode
+	// them if they were already encoded manually in config.
+	// see https://github.com/terraform-providers/terraform-provider-google/issues/3176
+	if strings.Contains(name, "/") {
+		name = url.QueryEscape(name)
+	}
 	// Using REST apis because the storage go client doesn't support folders
 	url := fmt.Sprintf("https://www.googleapis.com/storage/v1/b/%s/o/%s", bucket, name)