Function IsValidUsername

author/author.go:109–136

IsValidUsername returns true if a given username is neither reserved nor of the correct format.

(cfg *config.Config, username string)

// IsValidUsername returns true if a given username is neither reserved nor
// of the correct format.
func IsValidUsername(cfg *config.Config, username string) bool {
	// Username has to be above a character limit
	if len(username) < cfg.App.MinUsernameLen {
		return false
	}
	// Username is invalid if page with the same name exists. So traverse
	// available pages, adding them to reservedUsernames map that'll be checked
	// later.
	err := filepath.Walk(filepath.Join(cfg.Server.PagesParentDir, "pages"), func(path string, i os.FileInfo, err error) error {
		if err != nil {
			return err
		}
		reservedUsernames[i.Name()] = true
		return nil
	})
	if err != nil {
		log.Error("[IMPORTANT WARNING]: Could not determine IsValidUsername! %s", err)
		return false
	}

	// Username is invalid if it is reserved!
	if _, reserved := reservedUsernames[username]; reserved {
		return false
	}

	// TODO: use correct regexp function here
	return len(validUsernameReg.FindStringSubmatch(username)) > 0
}