thor-devkit
Version:
Typescript library to aid DApp development on VeChain Thor
235 lines • 19 kB
JavaScript
import BigNumber from 'bignumber.js';
import * as rlp from 'rlp';
import { Buffer } from 'buffer';
export class RLP {
constructor(profile) {
this.profile = profile;
}
/**
* encode data according to profile
* @param data the structured data to be encoded
*/
encode(data) {
const packed = pack(data, this.profile, '');
return rlp.encode(packed);
}
/**
* decode buffer according to profile
* @param buf rlp encoded data
*/
decode(buf) {
const packed = rlp.decode(buf);
return unpack(packed, this.profile, '');
}
}
(function (RLP) {
/** base class of scalar kind */
class ScalarKind {
}
RLP.ScalarKind = ScalarKind;
/** a buffer kind to keep buffer type */
class BufferKind extends ScalarKind {
data(data, ctx) {
assert(Buffer.isBuffer(data), ctx, 'expected buffer');
return { encode() { return data; } };
}
buffer(buf, ctx) {
return { decode() { return buf; } };
}
}
RLP.BufferKind = BufferKind;
/** a scalar kind to presents number */
class NumericKind extends ScalarKind {
/**
* create a numeric kind
* @param maxBytes up limit of data in bytes
*/
constructor(maxBytes) {
super();
this.maxBytes = maxBytes;
}
data(data, ctx) {
assert(typeof data === 'string' || typeof data === 'number', ctx, 'expected string or number');
if (typeof data === 'string') {
const isHex = isHexString(data);
const isDec = isDecString(data);
assert(isHex || isDec, ctx, 'expected non-negative integer in hex or dec string');
if (isHex) {
assert(data.length > 2, ctx, 'expected valid hex string');
}
}
else {
assert(Number.isSafeInteger(data) && data >= 0, ctx, 'expected non-negative safe integer');
}
const bn = new BigNumber(data);
if (bn.isZero()) {
return {
encode() {
return Buffer.alloc(0);
}
};
}
let hex = bn.toString(16);
if (hex.length % 2 !== 0) {
hex = '0' + hex;
}
assert(this.maxBytes ? hex.length <= this.maxBytes * 2 : true, ctx, `expected number in ${this.maxBytes} bytes`);
return {
encode() {
return Buffer.from(hex, 'hex');
}
};
}
buffer(buf, ctx) {
assert(this.maxBytes ? buf.length <= this.maxBytes : true, ctx, `expected less than ${this.maxBytes} bytes`);
assert(buf.length === 0 || buf[0] !== 0, ctx, 'expected canonical integer (no leading zero bytes)');
return {
decode() {
if (buf.length === 0) {
return 0;
}
const bn = new BigNumber(buf.toString('hex'), 16);
const num = bn.toNumber();
return Number.isSafeInteger(num) ? num : '0x' + bn.toString(16);
}
};
}
}
RLP.NumericKind = NumericKind;
/** a scalar kind to present blob */
class BlobKind extends ScalarKind {
data(data, ctx) {
assert(isHexString(data), ctx, 'expected hex string');
assert(data.length % 2 === 0, ctx, 'expected even length hex');
return {
encode() {
return Buffer.from(data.slice(2), 'hex');
}
};
}
buffer(buf, ctx) {
return {
decode() {
return '0x' + buf.toString('hex');
}
};
}
}
RLP.BlobKind = BlobKind;
/** fixed length blob */
class FixedBlobKind extends BlobKind {
constructor(bytes) {
super();
this.bytes = bytes;
}
data(data, ctx) {
const encoder = super.data(data, ctx);
assert(data.length === this.bytes * 2 + 2, ctx, `expected hex string presents ${this.bytes} bytes`);
return encoder;
}
buffer(buf, ctx) {
const decoder = super.buffer(buf, ctx);
assert(buf.length === this.bytes, ctx, `expected ${this.bytes} bytes`);
return decoder;
}
}
RLP.FixedBlobKind = FixedBlobKind;
/** fixed length blob allowing null */
class NullableFixedBlobKind extends FixedBlobKind {
data(data, ctx) {
if (!data) {
return {
encode() {
return Buffer.alloc(0);
}
};
}
return super.data(data, ctx);
}
buffer(buf, ctx) {
if (buf.length === 0) {
return { decode() { return null; } };
}
return super.buffer(buf, ctx);
}
}
RLP.NullableFixedBlobKind = NullableFixedBlobKind;
/** fixed length blob kind that will remove leading zero on encoding and pad zero on decoding */
class CompactFixedBlobKind extends FixedBlobKind {
data(data, ctx) {
const buf = super.data(data, ctx).encode();
return {
encode() {
const nzIndex = buf.findIndex(v => v !== 0);
if (nzIndex >= 0) {
return buf.slice(nzIndex);
}
return Buffer.alloc(0);
}
};
}
buffer(buf, ctx) {
assert(buf.length <= this.bytes, ctx, `expected less than ${this.bytes} bytes`);
assert(buf.length === 0 || buf[0] !== 0, ctx, 'expected no leading zero bytes');
const bytes = this.bytes;
return {
decode() {
const zeros = '0'.repeat((bytes - buf.length) * 2);
return '0x' + zeros + buf.toString('hex');
}
};
}
}
RLP.CompactFixedBlobKind = CompactFixedBlobKind;
})(RLP || (RLP = {}));
function pack(obj, profile, ctx) {
ctx = ctx ? ctx + '.' + profile.name : profile.name;
const kind = profile.kind;
if (kind instanceof RLP.ScalarKind) {
return kind.data(obj, ctx).encode();
}
if (Array.isArray(kind)) {
return kind.map(k => pack(obj[k.name], k, ctx));
}
assert(Array.isArray(obj), ctx, 'expected array');
const item = kind.item;
return obj.map((part, i) => pack(part, { name: '#' + i, kind: item }, ctx));
}
function unpack(packed, profile, ctx) {
ctx = ctx ? ctx + '.' + profile.name : profile.name;
const kind = profile.kind;
if (kind instanceof RLP.ScalarKind) {
assert(Buffer.isBuffer(packed), ctx, 'expected Buffer');
return kind.buffer(packed, ctx).decode();
}
if (Array.isArray(kind)) {
assert(Array.isArray(packed), ctx, 'expected array');
const parts = packed;
assert(parts.length === kind.length, ctx, `expected ${kind.length} items, but got ${parts.length}`);
return kind.reduce((o, p, i) => {
o[p.name] = unpack(parts[i], p, ctx);
return o;
}, {});
}
assert(Array.isArray(packed), ctx, 'expected array');
const item = kind.item;
return packed.map((part, i) => unpack(part, { name: '#' + i, kind: item }, ctx));
}
function assert(cond, ctx, msg) {
if (!cond) {
throw new RLPError(`${ctx}: ${msg}`);
}
}
function isHexString(str) {
return /^0x[0-9a-f]*$/i.test(str);
}
function isDecString(str) {
return /^\d+$/.test(str);
}
class RLPError extends Error {
constructor(msg) {
super(msg);
this.name = RLPError.name;
}
}
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