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43 lines
1.3 KiB
43 lines
1.3 KiB
const mergeMiddleware = require('json-rpc-engine/src/mergeMiddleware')
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const createScaffoldMiddleware = require('json-rpc-engine/src/createScaffoldMiddleware')
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const createAsyncMiddleware = require('json-rpc-engine/src/createAsyncMiddleware')
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const createWalletSubprovider = require('eth-json-rpc-middleware/wallet')
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module.exports = createMetamaskMiddleware
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function createMetamaskMiddleware ({
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version,
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getAccounts,
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processTransaction,
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processEthSignMessage,
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processTypedMessage,
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processPersonalMessage,
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getPendingNonce,
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}) {
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const metamaskMiddleware = mergeMiddleware([
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createScaffoldMiddleware({
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// staticSubprovider
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eth_syncing: false,
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web3_clientVersion: `MetaMask/v${version}`,
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}),
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createWalletSubprovider({
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getAccounts,
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processTransaction,
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processEthSignMessage,
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processTypedMessage,
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processPersonalMessage,
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}),
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createPendingNonceMiddleware({ getPendingNonce }),
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])
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return metamaskMiddleware
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}
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function createPendingNonceMiddleware ({ getPendingNonce }) {
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return createAsyncMiddleware(async (req, res, next) => {
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if (req.method !== 'eth_getTransactionCount') return next()
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const address = req.params[0]
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const blockRef = req.params[1]
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if (blockRef !== 'pending') return next()
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req.result = await getPendingNonce(address)
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})
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}
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