thor-devkit
Version:
Typescript library to aid DApp development on VeChain Thor
223 lines • 16.7 kB
JavaScript
import { AbiCoder, Fragment, ParamType } from 'ethers';
import { keccak256 } from './keccak';
import { Buffer } from 'buffer';
const _coder = new AbiCoder();
function processDecoded(type, value) {
if (type.baseType === 'address')
return value.toLowerCase();
if (type.baseType.startsWith('uint') || type.baseType.startsWith('int'))
return value.toString();
if (type.baseType === 'array')
return value.map((v) => processDecoded(type.arrayChildren, v));
if (type.baseType === 'tuple') {
const processed = value.map((v, i) => processDecoded(type.components[i], v));
type.components.forEach((comp, i) => {
if (comp.name) {
processed[comp.name] = processed[i];
}
});
return processed;
}
return value;
}
function toParamType(t) {
return typeof t === 'string'
? ParamType.from(t)
: ParamType.from({ name: t.name, type: t.type, components: t.components });
}
function encodeValues(types, values) {
var _a;
try {
return _coder.encode(types.map(toParamType), values);
}
catch (err) {
throw new Error((_a = err.message) !== null && _a !== void 0 ? _a : String(err));
}
}
function decodeValues(types, data) {
var _a;
if (types.length === 0)
return [];
try {
const pts = types.map(toParamType);
const raw = _coder.decode(pts, data);
return pts.map((pt, i) => processDecoded(pt, raw[i]));
}
catch (err) {
throw new Error((_a = err.message) !== null && _a !== void 0 ? _a : String(err));
}
}
function formatSignature(fragment) {
var _a;
try {
return Fragment.from(fragment).format('sighash');
}
catch (err) {
throw new Error((_a = err.message) !== null && _a !== void 0 ? _a : String(err));
}
}
/** encode/decode parameters of contract function call, event log, according to ABI JSON */
export var abi;
(function (abi) {
/**
* encode single parameter
* @param type type of the parameter
* @param value value of the parameter
* @returns encoded value in hex string
*/
function encodeParameter(type, value) {
return encodeValues([type], [value]);
}
abi.encodeParameter = encodeParameter;
/**
* decode single parameter
* @param type type of the parameter
* @param data encoded parameter in hex string
* @returns decoded value
*/
function decodeParameter(type, data) {
return decodeValues([type], data)[0];
}
abi.decodeParameter = decodeParameter;
/**
* encode a group of parameters
* @param types type array
* @param values value array
* @returns encoded values in hex string
*/
function encodeParameters(types, values) {
return encodeValues(types, values);
}
abi.encodeParameters = encodeParameters;
/**
* decode a group of parameters
* @param types type array
* @param data encoded values in hex string
* @returns decoded object
*/
function decodeParameters(types, data) {
const result = decodeValues(types, data);
const decoded = {};
types.forEach((t, i) => {
decoded[i] = result[i];
if (t.name) {
decoded[t.name] = result[i];
}
});
return decoded;
}
abi.decodeParameters = decodeParameters;
/** for contract function */
class Function {
/**
* create a function object
* @param definition abi definition of the function
*/
constructor(definition) {
this.definition = definition;
this.canonicalName = formatSignature(definition);
this.signature = '0x' + keccak256(this.canonicalName).slice(0, 4).toString('hex');
}
/**
* encode input parameters into call data
* @param args arguments for the function
*/
encode(...args) {
return this.signature + encodeParameters(this.definition.inputs, args).slice(2);
}
/**
* decode output data
* @param outputData output data to decode
*/
decode(outputData) {
return decodeParameters(this.definition.outputs, outputData);
}
}
abi.Function = Function;
/** for contract event */
class Event {
/** for contract event */
constructor(definition) {
this.definition = definition;
this.canonicalName = formatSignature(definition);
this.signature = '0x' + keccak256(this.canonicalName).toString('hex');
}
/**
* encode an object of indexed keys into topics.
* @param indexed an object contains indexed keys
*/
encode(indexed) {
const topics = [];
if (!this.definition.anonymous) {
topics.push(this.signature);
}
for (const input of this.definition.inputs) {
if (!input.indexed) {
continue;
}
const value = indexed[input.name];
if (value === undefined || value === null) {
topics.push(null);
}
else {
let topic;
// https://docs.soliditylang.org/en/v0.8.11/abi-spec.html#encoding-of-indexed-event-parameters
if (isValueType(input.type)) {
topic = encodeParameter(input.type, value);
}
else {
if (input.type === 'string') {
topic = '0x' + keccak256(value).toString('hex');
}
else if (typeof value === 'string' &&
/^0x[0-9a-f]+$/i.test(value) && value.length % 2 === 0) {
// value is encoded
topic = '0x' + keccak256(Buffer.from(value.slice(2), 'hex')).toString('hex');
}
else {
throw new Error(`event.encode: invalid ${input.type} value`);
}
}
topics.push(topic);
}
}
return topics;
}
/**
* decode event log
* @param data data in event output
* @param topics topics in event
*/
decode(data, topics) {
if (!this.definition.anonymous) {
topics = topics.slice(1);
}
if (this.definition.inputs.filter(t => t.indexed).length !== topics.length) {
throw new Error('invalid topics count');
}
const decodedNonIndexed = decodeValues(this.definition.inputs.filter(t => !t.indexed), data);
const decoded = {};
this.definition.inputs.forEach((t, i) => {
if (t.indexed) {
const topic = topics.shift();
decoded[i] = isValueType(t.type) ? decodeParameter(t.type, topic) : topic;
}
else {
decoded[i] = decodedNonIndexed.shift();
}
if (t.name) {
decoded[t.name] = decoded[i];
}
});
return decoded;
}
}
abi.Event = Event;
function isValueType(type) {
return (type === 'address' ||
type === 'bool' ||
/^(u?int)(\d*)$/.test(type) ||
/^bytes(\d+)$/.test(type));
}
})(abi || (abi = {}));
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