88 lines
2.9 KiB
JavaScript
88 lines
2.9 KiB
JavaScript
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"use strict";
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import { BigNumber } from "@ethersproject/bignumber";
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import { arrayify, concat, hexlify, zeroPad } from "@ethersproject/bytes";
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import { keccak256 as hashKeccak256 } from "@ethersproject/keccak256";
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import { sha256 as hashSha256 } from "@ethersproject/sha2";
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import { toUtf8Bytes } from "@ethersproject/strings";
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const regexBytes = new RegExp("^bytes([0-9]+)$");
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const regexNumber = new RegExp("^(u?int)([0-9]*)$");
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const regexArray = new RegExp("^(.*)\\[([0-9]*)\\]$");
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const Zeros = "0000000000000000000000000000000000000000000000000000000000000000";
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function _pack(type, value, isArray) {
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switch (type) {
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case "address":
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if (isArray) {
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return zeroPad(value, 32);
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}
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return arrayify(value);
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case "string":
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return toUtf8Bytes(value);
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case "bytes":
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return arrayify(value);
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case "bool":
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value = (value ? "0x01" : "0x00");
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if (isArray) {
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return zeroPad(value, 32);
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}
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return arrayify(value);
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}
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let match = type.match(regexNumber);
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if (match) {
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//let signed = (match[1] === "int")
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let size = parseInt(match[2] || "256");
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if ((size % 8 != 0) || size === 0 || size > 256) {
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throw new Error("invalid number type - " + type);
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}
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if (isArray) {
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size = 256;
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}
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value = BigNumber.from(value).toTwos(size);
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return zeroPad(value, size / 8);
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}
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match = type.match(regexBytes);
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if (match) {
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let size = parseInt(match[1]);
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if (String(size) != match[1] || size === 0 || size > 32) {
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throw new Error("invalid number type - " + type);
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}
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if (arrayify(value).byteLength !== size) {
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throw new Error("invalid value for " + type);
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}
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if (isArray) {
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return arrayify((value + Zeros).substring(0, 66));
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}
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return value;
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}
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match = type.match(regexArray);
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if (match && Array.isArray(value)) {
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let baseType = match[1];
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let count = parseInt(match[2] || String(value.length));
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if (count != value.length) {
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throw new Error("invalid value for " + type);
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}
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let result = [];
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value.forEach(function (value) {
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result.push(_pack(baseType, value, true));
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});
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return concat(result);
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}
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throw new Error("unknown type - " + type);
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}
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// @TODO: Array Enum
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export function pack(types, values) {
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if (types.length != values.length) {
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throw new Error("type/value count mismatch");
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}
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let tight = [];
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types.forEach(function (type, index) {
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tight.push(_pack(type, values[index]));
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});
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return hexlify(concat(tight));
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}
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export function keccak256(types, values) {
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return hashKeccak256(pack(types, values));
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}
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export function sha256(types, values) {
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return hashSha256(pack(types, values));
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}
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