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const allowedMessageTarget = 'metamask'
const allowedMessageType = 'addUnconfirmedTx'
// inject in-page script
var scriptTag = document.createElement('script')
scriptTag.src = chrome.extension.getURL('scripts/inpage.js')
scriptTag.onload = function() { this.parentNode.removeChild(this) }
var container = document.head || document.documentElement
container.appendChild(scriptTag)
// setup connection with background
var metamaskPlugin = chrome.runtime.connect({name: 'metamask'})
// forward messages from inpage to background
window.addEventListener('message', receiveMessage, false);
function receiveMessage(event){
var msg = event.data
// validate message type
if (typeof msg !== 'object') return
if (msg.to !== allowedMessageTarget) return
if (msg.type !== allowedMessageType) return
// forward message
metamaskPlugin.postMessage(msg)
}
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