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import * as _ from 'lodash';
import * as BigNumber from 'bignumber.js';
import * as Web3 from 'web3';
import {Web3Wrapper} from '../web3_wrapper';
import {SchemaValidator, Schema} from '0x-json-schemas';
const HEX_REGEX = /^0x[0-9A-F]*$/i;
export const assert = {
isBigNumber(variableName: string, value: BigNumber.BigNumber): void {
const isBigNumber = _.isObject(value) && value.isBigNumber;
this.assert(isBigNumber, this.typeAssertionMessage(variableName, 'BigNumber', value));
},
isUndefined(value: any, variableName?: string): void {
this.assert(_.isUndefined(value), this.typeAssertionMessage(variableName, 'undefined', value));
},
isString(variableName: string, value: string): void {
this.assert(_.isString(value), this.typeAssertionMessage(variableName, 'string', value));
},
isFunction(variableName: string, value: any): void {
this.assert(_.isFunction(value), this.typeAssertionMessage(variableName, 'function', value));
},
isHexString(variableName: string, value: string): void {
this.assert(_.isString(value) && HEX_REGEX.test(value),
this.typeAssertionMessage(variableName, 'HexString', value));
},
isETHAddressHex(variableName: string, value: string): void {
const web3 = new Web3();
this.assert(web3.isAddress(value), this.typeAssertionMessage(variableName, 'ETHAddressHex', value));
this.assert(
web3.isAddress(value) && !web3.isChecksumAddress(value),
`Checksummed addresses are not supported. Convert ${variableName} to lower case before passing`,
);
},
doesBelongToStringEnum(variableName: string, value: string,
stringEnum: any /* There is no base type for every string enum */): void {
const doesBelongToStringEnum = !_.isUndefined(stringEnum[value]);
const enumValues = _.keys(stringEnum);
const enumValuesAsStrings = _.map(enumValues, enumValue => `'${enumValue}'`);
const enumValuesAsString = enumValuesAsStrings.join(', ');
assert.assert(
doesBelongToStringEnum,
`Expected ${variableName} to be one of: ${enumValuesAsString}, encountered: ${value}`,
);
},
async isSenderAddressAsync(variableName: string, senderAddressHex: string,
web3Wrapper: Web3Wrapper): Promise<void> {
assert.isETHAddressHex(variableName, senderAddressHex);
const isSenderAddressAvailable = await web3Wrapper.isSenderAddressAvailableAsync(senderAddressHex);
assert.assert(isSenderAddressAvailable,
`Specified ${variableName} ${senderAddressHex} isn't available through the supplied web3 provider`,
);
},
async isUserAddressAvailableAsync(web3Wrapper: Web3Wrapper): Promise<void> {
const availableAddresses = await web3Wrapper.getAvailableAddressesAsync();
this.assert(!_.isEmpty(availableAddresses), 'No addresses were available on the provided web3 provider');
},
hasAtMostOneUniqueValue(value: any[], errMsg: string): void {
this.assert(_.uniq(value).length <= 1, errMsg);
},
isNumber(variableName: string, value: number): void {
this.assert(_.isFinite(value), this.typeAssertionMessage(variableName, 'number', value));
},
isBoolean(variableName: string, value: boolean): void {
this.assert(_.isBoolean(value), this.typeAssertionMessage(variableName, 'boolean', value));
},
isWeb3Provider(variableName: string, value: Web3.Provider): void {
const isWeb3Provider = _.isFunction((value as any).send) || _.isFunction((value as any).sendAsync);
this.assert(isWeb3Provider, this.typeAssertionMessage(variableName, 'Web3.Provider', value));
},
doesConformToSchema(variableName: string, value: any, schema: Schema): void {
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): void {
if (!condition) {
throw new Error(message);
}
},
typeAssertionMessage(variableName: string, type: string, value: any): string {
return `Expected ${variableName} to be of type ${type}, encountered: ${value}`;
},
};
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