internal/policy/topic.go

 1package policy
 2
 3import (
 4	"fmt"
 5	"regexp"
 6)
 7
 8// MaxTopics caps topics per repository.
 9const MaxTopics = 20
10
11var topicPat = regexp.MustCompile(`^[a-z0-9][a-z0-9-]{0,34}$`)
12
13// ValidateTopic checks a repository topic: lowercase alphanumerics and
14// dashes, must start with an alphanumeric, max 35 chars.
15func ValidateTopic(topic string) error {
16	if !topicPat.MatchString(topic) {
17		return fmt.Errorf("invalid topic %q: lowercase letters, digits, and '-' only; must start with a letter or digit; max 35 chars", topic)
18	}
19	return nil
20}