start working on struct validation for gtsmodel

internal/util/regexes.go

@@ -90,6 +90,7 @@ var (
 	followPathRegex = regexp.MustCompile(followPathRegexString)
 
 	ulidRegexString = `[0123456789ABCDEFGHJKMNPQRSTVWXYZ]{26}`
+	ulidRegex = regexp.MustCompile(fmt.Sprintf(`^%s$`, ulidRegexString))
 
 	likedPathRegexString = fmt.Sprintf(`^/?%s/(%s)/%s$`, UsersPath, usernameRegexString, LikedPath)
 	// likedPathRegex parses a path that validates and captures the username part from eg /users/example_username/liked

internal/util/validation.go

@@ -171,3 +171,8 @@ func ValidateSiteTerms(t string) error {
 
 	return nil
 }
+
+// ValidateULID returns true if the passed string is a valid ULID.
+func ValidateULID(i string) bool {
+	return ulidRegex.MatchString(i)
+}