node-xmpp-joap

Jabber Object Access Protocol XEP-0075 library for node-xmpp.

Installation

With package manager npm:

npm install node-xmpp-joap

Usage

import joap from "node-xmpp-joap";
import xmpp from "node-xmpp";

const app = new joap.Application(new xmpp.Component({
  jid       : "mycomponent",
  password  : "secret",
  host      : "127.0.0.1",
  port      : "8888"
}));

app.use((req, res, next) => {
  console.log(`received a ${req.type} request`);
  next();
});

Alias methods

app.read((req, res, next) => {
  console.log("received a read request");
  res.end({ foo: "bar" });
});

is equivalent to

app.use((req, res, next) => {
  if (req.type === 'read') {
    console.log("received a read request");
    res.end({ foo: "bar" });
  } else {
    next();
  }
});

Manager

import xmpp from "node-xmpp";
import joap from "node-xmpp-joap";

const comp = new xmpp.Component({
  jid       : "mycomponent",
  password  : "secret",
  host      : "127.0.0.1",
  port      : "8888"
});

class User {
  constructor(id, options={}){
    this.id = id;
  }
}

// create a new manager instance
const mgr = new joap.Manager(comp);

// add a class
mgr.addClass("User", User, {
  required: ["name", "age"],
  protected: ["id"],
  constructorAttributes: ["id", "options"]
});

// implement the ACL by overriding the method
mgr.hasPermission = (action, next) => {
  if (myACLRules(action)) {
    next(null, action);
  } else {
    next(new joap.Error("You are not allowed to do that :-P"), 403);
  }
};

Client

xmpp = require "node-xmpp"
joap = require "node-xmpp-joap"

comp = new xmpp.Component
  jid       : "mycomponent"
  password  : "secret"
  host      : "127.0.0.1"
  port      : "8888"

# create a new client instance
c = new joap.Client comp

# requesting the server description
c.describe "joap.server.tld", (err, iq, parsedDescription) ->

# requesting a class description
c.describe "user@server.tld", (err, iq, parsedDescription) ->

# creating a new instance
c.add "use@server.tld", { name:"My Name" }, (err, iq, instanceAddress) ->

# reading an instance
c.read "user@server.tld/instanceId", (err, iq, parsedResult) ->

# reading only a few properties of an instance
c.read "user@server.tld/instanceId", ["email", "age"], (err, iq, parsedResult) ->

# modifying properties of an instance
c.edit "user@server.tld/instanceId", { age: 27 }, (err, iq) ->

# deleting an instance
c.delete "user@server.tld/instanceId", (err, iq) ->

# searching for instances
c.search "user@server.tld", {age: 60} , err, iq, arrayOfInstanceIDs) ->

# performing a method call
c.methodCall "myMethod", "user@server.tld/instanceId", ["param1","param2"], (err, iq, result) ->

Persistence

If you want to persist the objects in a database you can simply override the methods saveInstance, loadInstance and deleteInstance. In this example we use nStore.

nStore  = require "nstore"

# create database
users = nStore.new './data/users.db', (err) ->

  if err?
    console.error err
  else

    # override
    mgr.saveInstance = (action, obj, next) ->
      if action.class is "User"
        users.save obj.id, obj, (err) -> next err, action
      else
        next (new Error "Storage for this class is not available"), a

    # override
    mgr.loadInstance = (action, next) ->
      if action.class is "User"
        users.get id, (err, inst) -> next err, action, inst
      else
        next (new Error "Storage for this class is not available"), a

    # override
    mgr.queryInstances = (a, next) ->
      if a.class is "User"
        if a.attributess?
          @users.find a.attributes, (err, res) -> next err, a, (id for id of res)
        else
          @users.all (err, res) -> next err, a, (id for id of res)
      else
        next (new Error "Storage for this class is not available"), a

    # override
    mgr.deleteInstance = (a, next) ->
      if a.class is "User"
        users.remove id, (err) -> next err, a
      else
        next (new Error "Storage for this class is not available"), a

Router

xmpp = require "node-xmpp"
joap = require "node-xmpp-joap"

comp = new xmpp.Component
  jid       : "mycomponent"
  password  : "secret"
  host      : "127.0.0.1"
  port      : "8888"

classes = {}
objects = {}

router = new joap.Router comp

router.on "action", (a) ->
  if a.class? and a.instance? and a.type is "read"
    router.sendResponse a, objects[a.class][a.instance]

router.on "read", (action) ->
  console.log "read iq received"

router.on "edit", (action) ->
  console.log "edit iq received"

router.on "add", (action) ->
  console.log "add iq received"

  if not classes[action.class]?
    router.sendError (new joap.Error "'#{action.class}' does't exists.", 404), action

  # ...

router.on "search", (action) ->

router.on "rpc", (action) ->
  console.log "calling #{action.method} with:"
  for param in actions.params
    console.log param

Running tests

npm install
npm test

JOAP client implementations

• strophe.js plugin

ToDo's

• describe support

License

node-xmpp-joap is licensed under the MIT-Licence (see LICENSE.txt)