Parse metadata.Name before creating tpr resource (#284)

controller/tpr.go

@@ -17,6 +17,9 @@ limitations under the License.
 package controller
 
 import (
+	"errors"
+	"regexp"
+
 	"github.com/fission/fission/tpr"
 )
 
@@ -27,3 +30,11 @@ func makeTPRBackedAPI() (*API, error) {
 	}
 	return &API{fissionClient: fissionClient}, nil
 }
+
+func validateResourceName(name string) error {
+	re := regexp.MustCompile(`[a-z0-9]([-a-z0-9]*[a-z0-9])?`)
+	if len(re.FindString(name)) != len(name) {
+		return errors.New("Name must consist of lower case alphanumeric characters or '-', and must start and end with an alphanumeric character (e.g. 'my-name',  or '123-abc', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?'")
+	}
+	return nil
+}