Add POA-GNO merge warning (#223)

README.md

@@ -3,7 +3,6 @@
 ## Base supported networks
 
 - Core POA network (RPC endpoint: `https://core.poa.network`)
-- xDai chain (RPC endpoint: `https://dai.poa.network`)
 - Sokol testnet (RPC endpoint: `https://sokol.poa.network`)
 - Kovan testnet (RPC endpoint: `https://kovan.infura.io/`)
 
@@ -24,7 +23,7 @@ Please check related posts in wiki [Governance Overview](https://github.com/poan
 ## Configuration
 Governance DApp is configured with [POA Network governance contracts](https://github.com/poanetwork/poa-network-consensus-contracts)
 
-There are contracts' addresses for [Sokol](https://github.com/poanetwork/poa-chain-spec/blob/sokol/contracts.json), [Core](https://github.com/poanetwork/poa-chain-spec/blob/core/contracts.json), [xDai](https://github.com/poanetwork/poa-chain-spec/blob/dai/contracts.json), and [Kovan](https://github.com/poanetwork/poa-chain-spec/blob/kovan/contracts.json).
+There are contracts' addresses for [Sokol](https://github.com/poanetwork/poa-chain-spec/blob/sokol/contracts.json), [Core](https://github.com/poanetwork/poa-chain-spec/blob/core/contracts.json), and [Kovan](https://github.com/poanetwork/poa-chain-spec/blob/kovan/contracts.json).
 
 
 ## Building from source

src/index.js

@@ -17,6 +17,7 @@ import { RouterStore, syncHistoryWithStore } from 'mobx-react-router'
 import { constants } from './utils/constants'
 import { getContractsAddresses } from './contracts/addresses'
 import { getNetworkBranch } from './utils/utils'
+import messages from './utils/messages'
 
 const browserHistory = createBrowserHistory()
 const routingStore = new RouterStore()
@@ -42,6 +43,15 @@ class AppMainRouter extends Component {
       .then(async web3Config => {
         await this.initialize(web3Config)
         commonStore.hideLoading()
+        if (web3Config.netId === 99) {
+          // if it's POA Core network
+          const currentTimestamp = Math.floor(Date.now() / 1000)
+          swal({
+            title: 'Attention',
+            html: generateElement(currentTimestamp < 1651698000 ? messages.poaGnoMerging : messages.poaGnoMerged),
+            type: 'warning'
+          })
+        }
       })
       .catch(error => {
         console.error(error.message)

src/utils/messages.js

@@ -51,4 +51,10 @@ messages.networkMatchError = function(netId) {
   return `Networks in DApp and MetaMask do not match. Switch MetaMask to <b>${networkName}</b> or change the network in DApp.`
 }
 
+messages.poaGnoMerging =
+  'POA is joining the Gnosis Chain ecosystem, and token holders can now swap POA for STAKE and then STAKE for GNO on the Gnosis Chain! More info and instructions <a href="https://www.poa.network/" target="_blank">here</a>.'
+
+messages.poaGnoMerged =
+  'POA Network merged with the Gnosis Chain.<br /><a href="https://www.poa.network/" target="_blank">More information</a> about the merger.'
+
 export default messages