12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485 |
- // Copyright (c) 2012-2014 Jeremy Latt
- // Copyright (c) 2014-2015 Edmund Huber
- // Copyright (c) 2016-2017 Daniel Oaks <daniel@danieloaks.net>
- // released under the MIT license
-
- package irc
-
- import (
- "errors"
- "strings"
-
- "golang.org/x/text/secure/precis"
- )
-
- const (
- casemappingName = "rfc7613"
- )
-
- var (
- errInvalidCharacter = errors.New("Invalid character")
- errEmpty = errors.New("String is empty")
- )
-
- // Casefold returns a casefolded string, without doing any name or channel character checks.
- func Casefold(str string) (string, error) {
- return precis.UsernameCaseMapped.CompareKey(str)
- }
-
- // CasefoldChannel returns a casefolded version of a channel name.
- func CasefoldChannel(name string) (string, error) {
- lowered, err := Casefold(name)
-
- if err != nil {
- return "", err
- } else if len(lowered) == 0 {
- return "", errEmpty
- }
-
- if lowered[0] != '#' {
- return "", errInvalidCharacter
- }
-
- // space can't be used
- // , is used as a separator
- // * is used in mask matching
- // ? is used in mask matching
- if strings.Contains(lowered, " ") || strings.Contains(lowered, ",") ||
- strings.Contains(lowered, "*") || strings.Contains(lowered, "?") {
- return "", errInvalidCharacter
- }
-
- return lowered, err
- }
-
- // CasefoldName returns a casefolded version of a nick/user name.
- func CasefoldName(name string) (string, error) {
- lowered, err := Casefold(name)
-
- if err != nil {
- return "", err
- } else if len(lowered) == 0 {
- return "", errEmpty
- }
-
- // space can't be used
- // , is used as a separator
- // * is used in mask matching
- // ? is used in mask matching
- // . denotes a server name
- // ! separates nickname from username
- // @ separates username from hostname
- // : means trailing
- // # is a channel prefix
- // ~&@%+ are channel membership prefixes
- // - I feel like disallowing
- if strings.Contains(lowered, " ") || strings.Contains(lowered, ",") ||
- strings.Contains(lowered, "*") || strings.Contains(lowered, "?") ||
- strings.Contains(lowered, ".") || strings.Contains(lowered, "!") ||
- strings.Contains(lowered, "@") ||
- strings.Contains("#~&@%+-", string(lowered[0])) {
- return "", errInvalidCharacter
- }
-
- return lowered, err
- }
|