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90 lines
2.2 KiB
90 lines
2.2 KiB
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const createAsyncMiddleware = require('json-rpc-engine/src/createAsyncMiddleware')
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const { ethErrors } = require('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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module.exports = function createMethodMiddleware ({
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store, storeKey, getAccounts, requestAccountsPermission,
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}) {
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return createAsyncMiddleware(async (req, res, next) => {
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if (typeof req.method !== 'string') {
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res.error = ethErrors.rpc.invalidRequest({ data: req})
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return
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}
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switch (req.method) {
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// intercepting eth_accounts requests for backwards compatibility,
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// i.e. return an empty array instead of an error
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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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// 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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if (accounts.length > 0) {
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res.result = accounts
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} else {
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// this should never happen
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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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case 'wallet_sendDomainMetadata':
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const storeState = store.getState()[storeKey]
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const extensionId = storeState[req.origin]
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? storeState[req.origin].extensionId
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: undefined
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if (
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req.domainMetadata &&
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typeof req.domainMetadata.name === 'string'
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) {
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store.updateState({
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[storeKey]: {
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...storeState,
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[req.origin]: {
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extensionId,
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...req.domainMetadata,
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},
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},
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})
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}
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res.result = true
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return
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default:
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break
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}
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next()
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})
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}
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