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/* tslint:disable prefer-function-over-method */
import { DataItem } from 'ethereum-types';
import * as ethUtil from 'ethereumjs-util';
import * as _ from 'lodash';
import { DataTypeFactory, PayloadDataType } from '../abstract_data_types';
import { RawCalldata } from '../calldata';
import * as Constants from '../constants';
export class Address extends PayloadDataType {
public static ERROR_MESSAGE_ADDRESS_MUST_START_WITH_0X = "Address must start with '0x'";
public static ERROR_MESSAGE_ADDRESS_MUST_BE_20_BYTES = 'Address must be 20 bytes';
private static readonly _SIZE_KNOWN_AT_COMPILE_TIME: boolean = true;
private static readonly _ADDRESS_SIZE_IN_BYTES = 20;
private static readonly _DECODED_ADDRESS_OFFSET_IN_BYTES = Constants.EVM_WORD_WIDTH_IN_BYTES -
Address._ADDRESS_SIZE_IN_BYTES;
public static matchType(type: string): boolean {
return type === 'address';
}
public constructor(dataItem: DataItem, dataTypeFactory: DataTypeFactory) {
super(dataItem, dataTypeFactory, Address._SIZE_KNOWN_AT_COMPILE_TIME);
if (!Address.matchType(dataItem.type)) {
throw new Error(`Tried to instantiate Address with bad input: ${dataItem}`);
}
}
public getSignature(): string {
return 'address';
}
public encodeValue(value: string): Buffer {
if (!value.startsWith('0x')) {
throw new Error(Address.ERROR_MESSAGE_ADDRESS_MUST_START_WITH_0X);
}
const valueAsBuffer = ethUtil.toBuffer(value);
if (valueAsBuffer.byteLength !== Address._ADDRESS_SIZE_IN_BYTES) {
throw new Error(Address.ERROR_MESSAGE_ADDRESS_MUST_BE_20_BYTES);
}
const encodedValueBuf = ethUtil.setLengthLeft(valueAsBuffer, Constants.EVM_WORD_WIDTH_IN_BYTES);
return encodedValueBuf;
}
public decodeValue(calldata: RawCalldata): string {
const paddedValueBuf = calldata.popWord();
const valueBuf = paddedValueBuf.slice(Address._DECODED_ADDRESS_OFFSET_IN_BYTES);
const value = ethUtil.bufferToHex(valueBuf);
return value;
}
}
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