You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
1.8 KiB
56 lines
1.8 KiB
const Duplex = require('readable-stream').Duplex
|
|
const inherits = require('util').inherits
|
|
|
|
module.exports = LocalMessageDuplexStream
|
|
|
|
inherits(LocalMessageDuplexStream, Duplex)
|
|
|
|
function LocalMessageDuplexStream (opts) {
|
|
Duplex.call(this, {
|
|
objectMode: true,
|
|
})
|
|
|
|
// this._origin = opts.origin
|
|
this._name = opts.name
|
|
this._target = opts.target
|
|
|
|
// console.log('LocalMessageDuplexStream ('+this._name+') - initialized...')
|
|
window.addEventListener('message', this._onMessage.bind(this), false)
|
|
}
|
|
|
|
// private
|
|
|
|
LocalMessageDuplexStream.prototype._onMessage = function (event) {
|
|
var msg = event.data
|
|
// console.log('LocalMessageDuplexStream ('+this._name+') - heard message...', event)
|
|
// validate message
|
|
if (event.origin !== location.origin) return // console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (event.origin !== location.origin) ')
|
|
if (typeof msg !== 'object') return // console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (typeof msg !== "object") ')
|
|
if (msg.target !== this._name) return // console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (msg.target !== this._name) ', msg.target, this._name)
|
|
if (!msg.data) return // console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (!msg.data) ')
|
|
// console.log('LocalMessageDuplexStream ('+this._name+') - accepted', msg.data)
|
|
// forward message
|
|
try {
|
|
this.push(msg.data)
|
|
} catch (err) {
|
|
this.emit('error', err)
|
|
}
|
|
}
|
|
|
|
// stream plumbing
|
|
|
|
LocalMessageDuplexStream.prototype._read = noop
|
|
|
|
LocalMessageDuplexStream.prototype._write = function (data, encoding, cb) {
|
|
// console.log('LocalMessageDuplexStream ('+this._name+') - sending message...')
|
|
var message = {
|
|
target: this._target,
|
|
data: data,
|
|
}
|
|
window.postMessage(message, location.origin)
|
|
cb()
|
|
}
|
|
|
|
// util
|
|
|
|
function noop () {}
|
|
|