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validators.ts
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validators.ts
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import { prefix, prefixLength, Prefix } from './constants';
const bs58check = require('bs58check');
export enum ValidationResult {
NO_PREFIX_MATCHED,
INVALID_CHECKSUM,
INVALID_LENGTH,
VALID,
}
export function isValidPrefix(value: any): value is Prefix {
if (typeof value !== 'string') {
return false;
}
return value in prefix;
}
function validatePrefixedValue(value: any, prefixes: Prefix[]) {
const match = new RegExp(`^(${prefixes.join('|')})`).exec(value);
if (!match || match.length === 0) {
return ValidationResult.NO_PREFIX_MATCHED;
}
const prefixKey = match[0];
if (!isValidPrefix(prefixKey)) {
return ValidationResult.NO_PREFIX_MATCHED;
}
// decodeUnsafe return undefined if decoding fail
let decoded = bs58check.decodeUnsafe(value);
if (!decoded) {
return ValidationResult.INVALID_CHECKSUM;
}
decoded = decoded.slice(prefix[prefixKey].length);
if (decoded.length !== prefixLength[prefixKey]) {
return ValidationResult.INVALID_LENGTH;
}
return ValidationResult.VALID;
}
const implicitPrefix = [Prefix.TZ1, Prefix.TZ2, Prefix.TZ3];
const contractPrefix = [Prefix.KT1];
const signaturePrefix = [Prefix.EDSIG, Prefix.P2SIG, Prefix.SPSIG, Prefix.SIG];
const pkPrefix = [Prefix.EDPK, Prefix.SPPK, Prefix.P2PK];
export function validateAddress(value: any): ValidationResult {
return validatePrefixedValue(value, [...implicitPrefix, ...contractPrefix]);
}
export function validateChain(value: any): ValidationResult {
return validatePrefixedValue(value, [Prefix.NET]);
}
export function validateContractAddress(value: any): ValidationResult {
return validatePrefixedValue(value, contractPrefix);
}
export function validateKeyHash(value: any): ValidationResult {
return validatePrefixedValue(value, implicitPrefix);
}
export function validateSignature(value: any): ValidationResult {
return validatePrefixedValue(value, signaturePrefix);
}
export function validatePublicKey(value: any): ValidationResult {
return validatePrefixedValue(value, pkPrefix);
}