Merge pull request #122 from poanetwork/core-metamask-provider-updated

(Fix) Update getWeb3 script according to MetaMask breaking changes

src/utils/getWeb3.js

@@ -5,17 +5,38 @@ import messages from './messages'
 
 const defaultNetId = helpers.netIdByBranch(constants.branches.CORE)
 
+async function getAccounts(web3) {
+  let accounts
+  if (window.ethereum) {
+    accounts = await window.ethereum.request({ method: 'eth_accounts' })
+  } else {
+    accounts = await web3.eth.getAccounts()
+  }
+  return accounts
+}
+
+async function getNetId(web3) {
+  let netId
+  if (window.ethereum) {
+    const { chainId } = window.ethereum
+    netId = web3.utils.isHex(chainId) ? web3.utils.hexToNumber(chainId) : chainId
+  } else {
+    netId = await web3.eth.net.getId()
+  }
+  return netId
+}
+
 export async function enableWallet(onAccountChange) {
   if (window.ethereum) {
     try {
-      await window.ethereum.enable()
+      await window.ethereum.request({ method: 'eth_requestAccounts' })
     } catch (e) {
       await onAccountChange(null)
       throw Error(messages.userDeniedAccessToAccount)
     }
 
     const web3 = new Web3(window.ethereum)
-    const accounts = await web3.eth.getAccounts()
+    const accounts = await getAccounts(web3)
 
     await onAccountChange(accounts[0])
   }
@@ -28,7 +49,11 @@ export default async function getWeb3(netId, onAccountChange) {
   if (window.ethereum) {
     web3 = new Web3(window.ethereum)
     console.log('Injected web3 detected.')
-    window.ethereum.autoRefreshOnNetworkChange = true
+    if (!window.ethereum.autoRefreshOnNetworkChange) {
+      window.ethereum.on('chainChanged', () => {
+        window.location.reload()
+      })
+    }
   } else if (window.web3) {
     web3 = new Web3(window.web3.currentProvider)
     console.log('Injected web3 detected.')
@@ -38,7 +63,7 @@ export default async function getWeb3(netId, onAccountChange) {
     // Load for the first time in the current browser's session
     if (web3) {
       // MetaMask (or another plugin) is injected
-      netId = await web3.eth.net.getId()
+      netId = await getNetId(web3)
       if (!(netId in constants.NETWORKS)) {
         // If plugin's netId is unsupported, try to use
         // the previously chosen netId
@@ -67,25 +92,33 @@ export default async function getWeb3(netId, onAccountChange) {
   let networkMatch = false
 
   if (web3) {
-    const accounts = await web3.eth.getAccounts()
+    const accounts = await getAccounts(web3)
     defaultAccount = accounts[0] || null
 
     if (!defaultAccount) {
-      console.error('Unlock your wallet')
+      console.log('Unlock your wallet')
     }
 
-    if (web3.currentProvider.publicConfigStore) {
-      let currentAccount = defaultAccount ? defaultAccount.toLowerCase() : ''
-      web3.currentProvider.publicConfigStore.on('update', async function(obj) {
-        const account = obj.selectedAddress
-        if (account && account !== currentAccount) {
-          currentAccount = account
-          await onAccountChange(account)
-        }
+    let currentAccount = defaultAccount ? defaultAccount.toLowerCase() : null
+    async function onUpdateAccount(account) {
+      if (account && account !== currentAccount) {
+        currentAccount = account
+        await onAccountChange(account)
+      }
+    }
+    if (window.ethereum) {
+      window.ethereum.on('accountsChanged', async accs => {
+        const account = accs && accs.length > 0 ? accs[0].toLowerCase() : null
+        await onUpdateAccount(account)
+      })
+    } else if (web3.currentProvider.publicConfigStore) {
+      web3.currentProvider.publicConfigStore.on('update', async obj => {
+        const account = obj.selectedAddress ? obj.selectedAddress.toLowerCase() : null
+        await onUpdateAccount(account)
       })
     }
 
-    const web3NetId = await web3.eth.net.getId()
+    const web3NetId = await getNetId(web3)
     if (web3NetId === netId) {
       networkMatch = true
     } else {