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// Copyright 2014 The Mellium Contributors.
// Use of this source code is governed by the BSD-2-clause
// license that can be found in the LICENSE-mellium file.
// Original taken from mellium.im/xmpp/jid (BSD-2-Clause) and adjusted for my needs.
// Copyright Martin Dosch
package main
import (
"fmt"
"strings"
"unicode/utf8"
)
// MarshalJID checks that JIDs include localpart and serverpart
// and return it marshaled. Shamelessly stolen from
// mellium.im/xmpp/jid
func MarshalJID(input string) (string, error) {
var (
err error
localpart string
domainpart string
resourcepart string
)
s := input
// Remove any portion from the first '/' character to the end of the
// string (if there is a '/' character present).
sep := strings.Index(s, "/")
if sep == -1 {
resourcepart = ""
} else {
// If the resource part exists, make sure it isn't empty.
if sep == len(s)-1 {
return input, fmt.Errorf("invalid jid %s: the resourcepart must be larger than 0 bytes", input)
}
resourcepart = s[sep+1:]
s = s[:sep]
}
// Remove any portion from the beginning of the string to the first
// '@' character (if there is an '@' character present).
sep = strings.Index(s, "@")
switch {
case sep == -1:
// There is no @ sign, and therefore no localpart.
domainpart = s
case sep == 0:
// The JID starts with an @ sign (invalid empty localpart)
err = fmt.Errorf("invalid jid: %s", input)
return input, err
default:
domainpart = s[sep+1:]
localpart = s[:sep]
}
// We'll throw out any trailing dots on domainparts, since they're ignored:
//
// If the domainpart includes a final character considered to be a label
// separator (dot) by [RFC1034], this character MUST be stripped from
// the domainpart before the JID of which it is a part is used for the
// purpose of routing an XML stanza, comparing against another JID, or
// constructing an XMPP URI or IRI [RFC5122]. In particular, such a
// character MUST be stripped before any other canonicalization steps
// are taken.
domainpart = strings.TrimSuffix(domainpart, ".")
var jid string
if !utf8.ValidString(localpart) || !utf8.ValidString(domainpart) || !utf8.ValidString(resourcepart) {
return input, fmt.Errorf("invalid jid: %s", input)
}
if domainpart == "" {
return input, fmt.Errorf("invalid jid: %s", input)
}
if localpart == "" {
jid = domainpart
} else {
jid = localpart + "@" + domainpart
}
if resourcepart == "" {
return jid, err
}
return jid + "/" + resourcepart, err
}
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