@latentflip/xmpp-jid
v1.2.2
Published
Parse XMPP URIs
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XMPP-JID
Parse and Create XMPP JIDs
What is this?
The xmpp-jid
module is for both parsing and creating XMPP addresses, which are called JIDs.
A JID often looks a lot like an email address with a user@host
form, but there's more to it:
full JID
/ \
[local@]domain[/resource]
\ /
bare JID
A JID can be composed of a local part, a domain part, and a resource part. The domain part is mandatory for all JIDs, and can even stand alone (e.g., as the address for a server).
The combination of a local (user) part and a domain is called a "bare JID", and it is used to identitfy a particular account at a server.
A JID that includes a resource is called a "full JID", and it is used to identify a particular client connection (i.e., a specific connection for the associated "bare JID" account).
Installing
$ npm install xmpp-jid
Building bundled/minified version (for AMD, etc)
$ make
The bundled and minified files will be in the generated build
directory.
Usage
var jid = require('xmpp-jid');
var res = new jid.JID('[email protected]');
// or jid.create('[email protected]/res');
//
// res == {
// local: 'user',
// domain: 'example.com',
// resource: 'res',
// bare: '[email protected]',
// full: '[email protected]/res',
// unescapedLocal: 'user',
// unescapedBare: '[email protected]',
// unescapedFull: '[email protected]/res',
// prepped: true
// }
StringPrep
Correctly working with JIDs can be slightly tricky thanks to Unicode, which requires us
to use StringPrep to normalize the individual parts of a JID so that we can safely use
them in comparisons. Unfortunately, we don't have access to StringPrep in browsers, so
all JID
objects are marked with a prepped
attribute indicating if StringPrep has
been applied.
Comparisons between JIDs should only be trusted if both JIDs have prepped
set to true
.
The provided equal
function can be used to reliably check that two JIDs are equivalent,
with an optional parameter to disable the prepped
flag check.
jid.equal('[email protected]/res', '[email protected]/res');
// true, if StringPrep is available
jid.equal('[email protected]/res', '[email protected]/res', false);
// true
jid.equal('[email protected]/res1', '[email protected]/res2');
// false, full JIDs don't match
The same applies for the provided equalBare
function, which checks that two
JIDs have the same "bare JID" form (i.e., it ignores differences in resources).
jid.equal('[email protected]/resource1', '[email protected]/resource2');
// true, if StringPrep is available
jid.equal('[email protected]/resource1', '[email protected]/resource2', false);
// true
jid.equal('[email protected]/resource1', '[email protected]/resource2', false);
// false, bare JIDs don't match
Even in the browser, there are ways to ensure that StringPrep is applied by getting
your XMPP server to do the prepping for you. This is already done for the standard
stanza routing attributes ("to"
and "from"
), and other places where the server
can reliably ensure that the JIDs are prepped (e.g., roster entries).
In other cases, you may need to use XEP-0328: JID Prep to explicity ask your server to prep a given JID.
JID Escaping
XEP-0106: JID Escaping allows you to create JIDs
using characters typically prohibited in the local part: "' <:>&@
When creating a new JID by specifying the local part separately (e.g. new JID('localpart', 'domain')
),
the local part will be automatically escaped where necessary.
(Using new JID('local@domain')
will not
escape the local part, as that is assumed to already be the escaped form.)
These fields on the resulting JID
object yield the human-presentable, unescaped forms:
unescapedLocal
unescapedBare
unescapedFull
If you show the unescaped forms anywhere to a user, you should do so everywhere to be consistent and prevent potential security issues related to JID spoofing.
License
MIT
Created By
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