Jaco Greeff
f07d66562b
* Remove default exports * Cleanup tests * Exports in util * Single secp256k1 instance * Length check * format check * encoded lengths
36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
// Copyright 2017-2020 @polkadot/util-crypto authors & contributors
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// SPDX-License-Identifier: Apache-2.0
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import { assert } from '@polkadot/util';
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import { BASE58_ALPHABET } from './bs58';
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interface CheckConfig {
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alphabet: string;
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ipfsChar: string;
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type: string;
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}
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const BASE_CONFIG = { alphabet: BASE58_ALPHABET, ipfsChar: 'z', type: 'base58' };
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export function validateChars ({ alphabet, ipfsChar, type }: CheckConfig, value?: string | null, ipfsCompat?: boolean): true {
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assert(value, `Expected non-null, non-empty ${type} input`);
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assert(!ipfsCompat || value[0] === ipfsChar, `Expected ${type} to start with '${ipfsChar}'`);
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for (let i = (ipfsCompat ? 1 : 0); i < value.length; i++) {
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assert(alphabet.includes(value[i]), `Invalid ${type} character "${value[i]}" (0x${value.charCodeAt(i).toString(16)}) at index ${i}`);
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}
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return true;
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}
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/**
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* @name base58Validate
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* @summary Validates a base58 value.
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* @description
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* Validates the the supplied value is valid base58
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*/
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export function base58Validate (value?: string | null, ipfsCompat?: boolean): true {
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return validateChars(BASE_CONFIG, value, ipfsCompat);
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}
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