103 lines
2.6 KiB
TypeScript
103 lines
2.6 KiB
TypeScript
import qs from 'query-string';
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import has from 'lodash/has';
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import EthTx from 'ethereumjs-tx';
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import { BlockExplorerConfig } from 'types/network';
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interface IObjectValue {
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[key: string]: any;
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}
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export function objectContainsObjectKeys(
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checkingObject: IObjectValue,
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containingObject: IObjectValue
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) {
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const checkingObjectKeys = Object.keys(checkingObject);
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const containsAll = checkingObjectKeys.map(key => has(containingObject, key));
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return containsAll.every(isTrue => isTrue);
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}
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export function getKeyByValue(object: IObjectValue, value: any) {
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return Object.keys(object).find(key => object[key] === value);
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}
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export function getParam(query: { [key: string]: string }, key: string) {
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const keys = Object.keys(query);
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const index = keys.findIndex(k => k.toLowerCase() === key.toLowerCase());
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if (index === -1) {
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return null;
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}
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return query[keys[index]];
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}
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export function getParamFromURL(url: string, param: string): string | undefined {
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return qs.parse(qs.extract(url))[param];
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}
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export function isPositiveInteger(n: number) {
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return Number.isInteger(n) && n > 0;
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}
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export const getValues = (...args: any[]) =>
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args.reduce((acc, currArg) => [...acc, ...Object.values(currArg)], []);
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export function transactionToRLP(tx: EthTx): string {
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const { v, r, s } = tx;
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// Poor man's serialize without signature.
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tx.v = Buffer.from([tx._chainId]);
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tx.r = Buffer.from([0]);
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tx.s = Buffer.from([0]);
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const rlp = '0x' + tx.serialize().toString('hex');
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// Restore previous values
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tx.v = v;
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tx.r = r;
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tx.s = s;
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return rlp;
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}
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export function signTransactionWithSignature(tx: EthTx, signature: string): Buffer {
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const sigBuf = Buffer.from(signature.substr(2), 'hex');
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// Mimicking the way tx.sign() works
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let v = sigBuf[64] + 27;
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if (tx._chainId > 0) {
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v += tx._chainId * 2 + 8;
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}
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tx.r = sigBuf.slice(0, 32);
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tx.s = sigBuf.slice(32, 64);
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tx.v = Buffer.from([v]);
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return tx.serialize();
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}
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interface ExplorerConfig {
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name: string;
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origin: string;
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txPath?: string;
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addressPath?: string;
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blockPath?: string;
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}
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export function makeExplorer(expConfig: ExplorerConfig): BlockExplorerConfig {
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const config: ExplorerConfig = {
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// Defaults
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txPath: 'tx',
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addressPath: 'address',
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blockPath: 'block',
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...expConfig
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};
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return {
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name: config.name,
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origin: config.origin,
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txUrl: hash => `${config.origin}/${config.txPath}/${hash}`,
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addressUrl: address => `${config.origin}/${config.addressPath}/${address}`,
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blockUrl: blockNum => `${config.origin}/${config.blockPath}/${blockNum}`
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};
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}
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