# resolve

XMPP connection methods resolution for JavaScript

`@xmpp/resolve` retrieves and sorts possible XMPP endpoints using DNS and HTTP Web Host Metadata.

## Install

```
npm install @xmpp/resolve
```

## Usage

```javascript
const resolve = require("@xmpp/resolve/resolve");

// optional
const options = {
  srv: [{ service: "xmpp-client", protocol: "tcp" }], // SRV records
  family: undefined, // IP version; 4, 6 or undefined for both
};

resolve("jabberfr.org", options).then(console.log).catch(console.error);
```

```javascript
[
  {
    address: "93.113.206.189",
    family: 4,
    name: "xmppjs.org",
    port: 5222,
    priority: 5,
    weight: 0,
  },
  {
    address: "2a03:75c0:39:3458::1",
    family: 6,
    name: "xmppjs.org",
    port: 5222,
    priority: 5,
    weight: 0,
  },
  { address: "93.113.206.189", family: 4 },
  { address: "2a03:75c0:39:3458::1", family: 6 },
  {
    attribute: "_xmpp-client-websocket",
    uri: "wss://xmppjs.org:443/websocket",
  },
  {
    attribute: "_xmpp-client-xbosh",
    uri: "https://xmppjs.org:443/bosh",
  },
];
```

## References

- [RFC 6120 Resolution of Fully Qualified Domain Names](https://xmpp.org/rfcs/rfc6120.html#tcp-resolution)
- [XEP-0156: Discovering Alternative XMPP Connection Methods](https://xmpp.org/extensions/xep-0156.html)
- [XEP-0368: SRV records for XMPP over TLS](https://xmpp.org/extensions/xep-0368.html)
- [RFC 6415 Web Host Metadata](https://tools.ietf.org/html/rfc6415)
- [DNS configuration in Jabber/XMPP](https://prosody.im/doc/dns)
- [https://wiki.xmpp.org/web/SRV_Records](https://wiki.xmpp.org/web/SRV_Records)