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116 lines
3.2 KiB
116 lines
3.2 KiB
import createAsyncMiddleware from 'json-rpc-engine/src/createAsyncMiddleware'
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import { ethErrors } from 'eth-json-rpc-errors'
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/**
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* Create middleware for handling certain methods and preprocessing permissions requests.
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*/
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export default function createMethodMiddleware ({
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addDomainMetadata,
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getAccounts,
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getUnlockPromise,
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hasPermission,
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notifyAccountsChanged,
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requestAccountsPermission,
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}) {
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let isProcessingRequestAccounts = false
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return createAsyncMiddleware(async (req, res, next) => {
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let responseHandler
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switch (req.method) {
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// Intercepting eth_accounts requests for backwards compatibility:
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// The getAccounts call below wraps the rpc-cap middleware, and returns
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// an empty array in case of errors (such as 4100:unauthorized)
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case 'eth_accounts':
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res.result = await getAccounts()
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return
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case 'eth_requestAccounts':
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if (isProcessingRequestAccounts) {
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res.error = ethErrors.rpc.resourceUnavailable(
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'Already processing eth_requestAccounts. Please wait.',
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)
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return
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}
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if (hasPermission('eth_accounts')) {
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isProcessingRequestAccounts = true
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await getUnlockPromise()
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isProcessingRequestAccounts = false
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}
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// first, just try to get accounts
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let accounts = await getAccounts()
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if (accounts.length > 0) {
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res.result = accounts
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return
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}
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// if no accounts, request the accounts permission
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try {
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await requestAccountsPermission()
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} catch (err) {
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res.error = err
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return
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}
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// get the accounts again
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accounts = await getAccounts()
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/* istanbul ignore else: too hard to induce, see below comment */
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if (accounts.length > 0) {
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res.result = accounts
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} else {
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// this should never happen, because it should be caught in the
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// above catch clause
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res.error = ethErrors.rpc.internal(
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'Accounts unexpectedly unavailable. Please report this bug.',
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)
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}
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return
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// custom method for getting metadata from the requesting domain,
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// sent automatically by the inpage provider when it's initialized
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case 'wallet_sendDomainMetadata':
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if (typeof req.domainMetadata?.name === 'string') {
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addDomainMetadata(req.origin, req.domainMetadata)
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}
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res.result = true
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return
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// register return handler to send accountsChanged notification
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case 'wallet_requestPermissions':
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if ('eth_accounts' in req.params?.[0]) {
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responseHandler = async () => {
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if (Array.isArray(res.result)) {
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for (const permission of res.result) {
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if (permission.parentCapability === 'eth_accounts') {
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notifyAccountsChanged(await getAccounts())
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}
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}
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}
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}
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}
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break
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default:
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break
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}
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// when this promise resolves, the response is on its way back
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await next()
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if (responseHandler) {
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responseHandler()
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}
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})
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}
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