45 lines
1.2 KiB
TypeScript
45 lines
1.2 KiB
TypeScript
// Copyright 2017-2020 @polkadot/react-api authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import { KUSAMA_GENESIS, POLKADOT_GENESIS } from '@polkadot/apps-config';
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import { Ledger } from '@polkadot/ui-keyring';
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import uiSettings from '@polkadot/ui-settings';
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import { assert } from '@polkadot/util';
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import { api } from './Api';
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const ALLOWED_CHAINS: [string, 'kusama' | 'polkadot'][] = [
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[KUSAMA_GENESIS, 'kusama'],
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[POLKADOT_GENESIS, 'polkadot']
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];
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let ledger: Ledger | null = null;
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export function isLedgerCapable (): boolean {
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try {
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return !!(window as unknown as { USB?: unknown }).USB && !!api && ALLOWED_CHAINS.map(([g]) => g).includes(api.genesisHash.toHex());
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} catch (error) {
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return false;
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}
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}
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export function isLedger (): boolean {
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return isLedgerCapable() && uiSettings.ledgerConn !== 'none';
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}
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export function clearLedger (): void {
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ledger = null;
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}
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export function getLedger (): Ledger {
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if (!ledger) {
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const def = api && ALLOWED_CHAINS.find(([g]) => g === api.genesisHash.toHex());
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assert(def, `Unable to find supported chain for ${api.genesisHash.toHex()}`);
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ledger = new Ledger(uiSettings.ledgerConn as 'u2f', def[1]);
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}
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return ledger;
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}
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