69 lines
1.8 KiB
TypeScript
69 lines
1.8 KiB
TypeScript
// Copyright 2017-2020 @polkadot/react-hooks authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import type { ApiPromise } from '@polkadot/api';
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import type { LedgerTypes } from '@polkadot/hw-ledger/types';
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import { useCallback, useMemo } from 'react';
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import { Ledger } from '@polkadot/hw-ledger';
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import networks from '@polkadot/networks';
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import uiSettings from '@polkadot/ui-settings';
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import { assert } from '@polkadot/util';
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import { useApi } from './useApi';
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interface StateBase {
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isLedgerCapable: boolean;
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isLedgerEnabled: boolean;
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}
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interface State extends StateBase {
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getLedger: () => Ledger;
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}
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const EMPTY_STATE: StateBase = {
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isLedgerCapable: false,
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isLedgerEnabled: false
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};
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const hasWebUsb = !!(window as unknown as { USB?: unknown }).USB;
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let ledger: Ledger | null = null;
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const ledgerChains = networks.filter((network) => network.hasLedgerSupport);
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function retrieveLedger (api: ApiPromise): Ledger {
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if (!ledger) {
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const genesisHex = api.genesisHash.toHex();
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const def = ledgerChains.find(({ genesisHash }) => genesisHash[0] === genesisHex);
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assert(def, `Unable to find supported chain for ${genesisHex}`);
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ledger = new Ledger(uiSettings.ledgerConn as LedgerTypes, def.network);
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}
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return ledger;
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}
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function getState (api: ApiPromise): StateBase {
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const isLedgerCapable = hasWebUsb && ledgerChains.map(({ genesisHash }) => genesisHash[0]).includes(api.genesisHash.toHex());
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return {
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isLedgerCapable,
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isLedgerEnabled: isLedgerCapable && uiSettings.ledgerConn !== 'none'
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};
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}
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export function useLedger (): State {
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const { api, isApiReady } = useApi();
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const getLedger = useCallback(
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() => retrieveLedger(api),
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[api]
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);
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return useMemo(
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() => ({ ...(isApiReady ? getState(api) : EMPTY_STATE), getLedger }),
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[api, getLedger, isApiReady]
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);
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}
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