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/*global Web3*/
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cleanContextForImports ( )
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require ( 'web3/dist/web3.min.js' )
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const log = require ( 'loglevel' )
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const LocalMessageDuplexStream = require ( 'post-message-stream' )
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const setupDappAutoReload = require ( './lib/auto-reload.js' )
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const MetamaskInpageProvider = require ( 'metamask-inpage-provider' )
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restoreContextAfterImports ( )
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log . setDefaultLevel ( process . env . METAMASK _DEBUG ? 'debug' : 'warn' )
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console . warn ( 'ATTENTION: In an effort to improve user privacy, MetaMask will ' +
'stop exposing user accounts to dapps by default beginning November 2nd, 2018. ' +
'Dapps should call provider.enable() in order to view and use accounts. Please see ' +
'https://bit.ly/2QQHXvF for complete information and up-to-date example code.' )
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//
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// setup plugin communication
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//
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// setup background connection
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var metamaskStream = new LocalMessageDuplexStream ( {
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name : 'inpage' ,
target : 'contentscript' ,
} )
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// compose the inpage provider
var inpageProvider = new MetamaskInpageProvider ( metamaskStream )
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// set a high max listener count to avoid unnecesary warnings
inpageProvider . setMaxListeners ( 100 )
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// Augment the provider with its enable method
inpageProvider . enable = function ( options = { } ) {
return new Promise ( ( resolve , reject ) => {
if ( options . mockRejection ) {
reject ( 'User rejected account access' )
} else {
inpageProvider . sendAsync ( { method : 'eth_accounts' , params : [ ] } , ( error , response ) => {
if ( error ) {
reject ( error )
} else {
resolve ( response . result )
}
} )
}
} )
}
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// Work around for web3@1.0 deleting the bound `sendAsync` but not the unbound
// `sendAsync` method on the prototype, causing `this` reference issues with drizzle
const proxiedInpageProvider = new Proxy ( inpageProvider , {
// straight up lie that we deleted the property so that it doesnt
// throw an error in strict mode
deleteProperty : ( ) => true ,
} )
window . ethereum = proxiedInpageProvider
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//
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// setup web3
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//
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if ( typeof window . web3 !== 'undefined' ) {
throw new Error ( ` MetaMask detected another web3.
MetaMask will not work reliably with another web3 extension .
This usually happens if you have two MetaMasks installed ,
or MetaMask and another web3 extension . Please remove one
and try again . ` )
}
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var web3 = new Web3 ( proxiedInpageProvider )
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web3 . setProvider = function ( ) {
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log . debug ( 'MetaMask - overrode web3.setProvider' )
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}
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log . debug ( 'MetaMask - injected web3' )
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setupDappAutoReload ( web3 , inpageProvider . publicConfigStore )
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// export global web3, with usage-detection and deprecation warning
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/ * T O D O : U n c o m m e n t t h i s a r e a o n c e a u t o - r e l o a d . j s h a s b e e n d e p r e c a t e d :
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let hasBeenWarned = false
global . web3 = new Proxy ( web3 , {
get : ( _web3 , key ) => {
// show warning once on web3 access
if ( ! hasBeenWarned && key !== 'currentProvider' ) {
console . warn ( 'MetaMask: web3 will be deprecated in the near future in favor of the ethereumProvider \nhttps://github.com/MetaMask/faq/blob/master/detecting_metamask.md#web3-deprecation' )
hasBeenWarned = true
}
// return value normally
return _web3 [ key ]
} ,
set : ( _web3 , key , value ) => {
// set value normally
_web3 [ key ] = value
} ,
} )
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* /
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// set web3 defaultAccount
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inpageProvider . publicConfigStore . subscribe ( function ( state ) {
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web3 . eth . defaultAccount = state . selectedAddress
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} )
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// need to make sure we aren't affected by overlapping namespaces
// and that we dont affect the app with our namespace
// mostly a fix for web3's BigNumber if AMD's "define" is defined...
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var _ _define
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/ * *
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* Caches reference to global define object and deletes it to
* avoid conflicts with other global define objects , such as
* AMD ' s define function
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* /
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function cleanContextForImports ( ) {
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_ _define = global . define
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try {
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global . define = undefined
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} catch ( _ ) {
console . warn ( 'MetaMask - global.define could not be deleted.' )
}
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}
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/ * *
* Restores global define object from cached reference
* /
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function restoreContextAfterImports ( ) {
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try {
global . define = _ _define
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} catch ( _ ) {
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console . warn ( 'MetaMask - global.define could not be overwritten.' )
}
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}