import * as _ from 'lodash'; import * as BigNumber from 'bignumber.js'; import Web3 = require('web3'); import {SchemaValidator} from './schema_validator'; const HEX_REGEX = /^0x([0-9A-F]{2})*$/i; export const assert = { isBigNumber(variableName: string, value: BigNumber.BigNumber) { const isBigNumber = _.isObject(value) && value.isBigNumber; this.assert(isBigNumber, this.typeAssertionMessage(variableName, 'BigNumber', value)); }, isString(variableName: string, value: string) { this.assert(_.isString(value), this.typeAssertionMessage(variableName, 'string', value)); }, isHexString(variableName: string, value: string) { this.assert(_.isString(value) && HEX_REGEX.test(value), this.typeAssertionMessage(variableName, 'HexString', value)); }, isETHAddressHex(variableName: string, value: ETHAddressHex) { const web3 = new Web3(); this.assert(web3.isAddress(value), this.typeAssertionMessage(variableName, 'ETHAddressHex', value)); }, isNumber(variableName: string, value: number) { this.assert(_.isFinite(value), this.typeAssertionMessage(variableName, 'number', value)); }, doesConformToSchema(variableName: string, value: object, schema: Schema) { const schemaValidator = new SchemaValidator(); const validationResult = schemaValidator.validate(value, schema); const hasValidationErrors = validationResult.errors.length > 0; const msg = `Expected ${variableName} to conform to schema ${schema.id} Encountered: ${JSON.stringify(value, null, '\t')} Validation errors: ${validationResult.errors.join(', ')}`; this.assert(!hasValidationErrors, msg); }, assert(condition: boolean, message: string) { if (!condition) { throw new Error(message); } }, typeAssertionMessage(variableName: string, type: string, value: any) { return `Expected ${variableName} to be of type ${type}, encountered: ${value}`; }, };