57 lines
1.8 KiB
JavaScript
57 lines
1.8 KiB
JavaScript
const Duplex = require('readable-stream').Duplex
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const inherits = require('util').inherits
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module.exports = LocalMessageDuplexStream
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inherits(LocalMessageDuplexStream, Duplex)
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function LocalMessageDuplexStream (opts) {
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Duplex.call(this, {
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objectMode: true,
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})
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// this._origin = opts.origin
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this._name = opts.name
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this._target = opts.target
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// console.log('LocalMessageDuplexStream ('+this._name+') - initialized...')
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window.addEventListener('message', this._onMessage.bind(this), false)
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}
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// private
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LocalMessageDuplexStream.prototype._onMessage = function (event) {
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var msg = event.data
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// console.log('LocalMessageDuplexStream ('+this._name+') - heard message...', event)
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// validate message
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if (event.origin !== location.origin) return // console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (event.origin !== location.origin) ')
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if (typeof msg !== 'object') return // console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (typeof msg !== "object") ')
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if (msg.target !== this._name) return // console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (msg.target !== this._name) ', msg.target, this._name)
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if (!msg.data) return // console.log('LocalMessageDuplexStream ('+this._name+') - rejected - (!msg.data) ')
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// console.log('LocalMessageDuplexStream ('+this._name+') - accepted', msg.data)
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// forward message
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try {
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this.push(msg.data)
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} catch (err) {
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this.emit('error', err)
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}
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}
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// stream plumbing
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LocalMessageDuplexStream.prototype._read = noop
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LocalMessageDuplexStream.prototype._write = function (data, encoding, cb) {
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// console.log('LocalMessageDuplexStream ('+this._name+') - sending message...')
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var message = {
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target: this._target,
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data: data,
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}
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window.postMessage(message, location.origin)
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cb()
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}
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// util
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function noop () {}
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