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import { Schema, SchemaValidator } from '@0xproject/json-schemas';
import { addressUtils, BigNumber } from '@0xproject/utils';
import * as _ from 'lodash';
import * as validUrl from 'valid-url';
const HEX_REGEX = /^0x[0-9A-F]*$/i;
export const assert = {
isBigNumber(variableName: string, value: BigNumber): void {
const isBigNumber = _.isObject(value) && (value as any).isBigNumber;
this.assert(isBigNumber, this.typeAssertionMessage(variableName, 'BigNumber', value));
},
isValidBaseUnitAmount(variableName: string, value: BigNumber) {
assert.isBigNumber(variableName, value);
const isNegative = value.lessThan(0);
this.assert(!isNegative, `${variableName} cannot be a negative number, found value: ${value.toNumber()}`);
const hasDecimals = value.decimalPlaces() !== 0;
this.assert(
!hasDecimals,
`${variableName} should be in baseUnits (no decimals), found value: ${value.toNumber()}`,
);
},
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 {
this.assert(addressUtils.isAddress(value), this.typeAssertionMessage(variableName, 'ETHAddressHex', value));
this.assert(
addressUtils.isAddress(value) && value.toLowerCase() === 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}`,
);
},
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: any): void {
const isWeb3Provider = _.isFunction(value.send) || _.isFunction(value.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);
},
isHttpUrl(variableName: string, value: any): void {
const isValidUrl = !_.isUndefined(validUrl.isWebUri(value));
this.assert(isValidUrl, this.typeAssertionMessage(variableName, 'http url', value));
},
isUri(variableName: string, value: any): void {
const isValidUri = !_.isUndefined(validUrl.isUri(value));
this.assert(isValidUri, this.typeAssertionMessage(variableName, 'uri', value));
},
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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