saepenatus/packages/core/src/chain.ts

Web3-Onboard makes it simple to connect Ethereum hardware and software wallets to your dapp. Features standardised spec compliant web3 providers for all supported wallets, framework agnostic modern javascript UI with code splitting, CSS customization, mul

import { firstValueFrom, Observable } from 'rxjs'
import { filter, map } from 'rxjs/operators'
import { Chain, ProviderRpcErrorCode } from '@web3-onboard/common'
import { addNewChain, switchChain } from './provider.js'
import { state } from './store/index.js'
import { switchChainModal$ } from './streams.js'
import { validateSetChainOptions } from './validation.js'
import type { WalletState } from './types.js'
import { toHexString } from './utils.js'

async function setChain(options: {
  chainId: string | number
  chainNamespace?: string
  wallet?: WalletState['label']
}): Promise<boolean> {
  const error = validateSetChainOptions(options)

  if (error) {
    throw error
  }

  const { wallets, chains } = state.get()
  const { chainId, chainNamespace = 'evm', wallet: walletToSet } = options
  const chainIdHex = toHexString(chainId)

  // validate that chainId has been added to chains
  const chain = chains.find(
    ({ namespace, id }) => namespace === chainNamespace && id === chainIdHex
  )

  if (!chain) {
    throw new Error(
      `Chain with chainId: ${chainId} and chainNamespace: ${chainNamespace} has not been set and must be added when Onboard is initialized.`
    )
  }

  const wallet = walletToSet
    ? wallets.find(({ label }) => label === walletToSet)
    : wallets[0]

  // validate a wallet is connected
  if (!wallet) {
    throw new Error(
      walletToSet
        ? `Wallet with label ${walletToSet} is not connected`
        : 'A wallet must be connected before a chain can be set'
    )
  }

  const [walletConnectedChain] = wallet.chains

  // check if wallet is already connected to chainId
  if (
    walletConnectedChain.namespace === chainNamespace &&
    walletConnectedChain.id === chainIdHex
  ) {
    return true
  }

  try {
    await switchChain(wallet.provider, chainIdHex)
    return true
  } catch (error) {
    const { code } = error as { code: number }
    const switchChainModalClosed$ = switchChainModal$.pipe(
      filter(x => x === null),
      map(() => false)
    )
    if (
      code === ProviderRpcErrorCode.CHAIN_NOT_ADDED ||
      code === ProviderRpcErrorCode.UNRECOGNIZED_CHAIN_ID
    ) {
      // chain has not been added to wallet
      return chainNotInWallet(
        wallet,
        chain,
        switchChainModalClosed$,
        chainIdHex
      )
    }

    if (code === ProviderRpcErrorCode.UNSUPPORTED_METHOD) {
      // method not supported
      switchChainModal$.next({ chain })
      return firstValueFrom(switchChainModalClosed$)
    }
  }

  return false
}

const chainNotInWallet = async (
  wallet: WalletState,
  chain: Chain,
  switchChainModalClosed$: Observable<boolean>,
  chainIdHex: string
): Promise<boolean> => {
  try {
    await addNewChain(wallet.provider, chain)
    await switchChain(wallet.provider, chainIdHex)
    return true
  } catch (error) {
    const { code } = error as { code: number }
    if (code === ProviderRpcErrorCode.ACCOUNT_ACCESS_REJECTED) {
      // add new chain rejected by user
      return false
    }
    // display notification to user to switch chain
    switchChainModal$.next({ chain })
    return firstValueFrom(switchChainModalClosed$)
  }
}

export default setChain