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Просмотр файла: abiParameters.js
import * as AbiParameters from '../AbiParameters.js';
import * as Address from '../Address.js';
import * as Bytes from '../Bytes.js';
import * as Errors from '../Errors.js';
import * as Hex from '../Hex.js';
import { integerRegex } from '../Solidity.js';
/** @internal */
export function decodeParameter(cursor, param, options) {
const { checksumAddress, staticPosition } = options;
const arrayComponents = getArrayComponents(param.type);
if (arrayComponents) {
const [length, type] = arrayComponents;
return decodeArray(cursor, { ...param, type }, { checksumAddress, length, staticPosition });
}
if (param.type === 'tuple')
return decodeTuple(cursor, param, {
checksumAddress,
staticPosition,
});
if (param.type === 'address')
return decodeAddress(cursor, { checksum: checksumAddress });
if (param.type === 'bool')
return decodeBool(cursor);
if (param.type.startsWith('bytes'))
return decodeBytes(cursor, param, { staticPosition });
if (param.type.startsWith('uint') || param.type.startsWith('int'))
return decodeNumber(cursor, param);
if (param.type === 'string')
return decodeString(cursor, { staticPosition });
throw new AbiParameters.InvalidTypeError(param.type);
}
const sizeOfLength = 32;
const sizeOfOffset = 32;
/** @internal */
export function decodeAddress(cursor, options = {}) {
const { checksum = false } = options;
const value = cursor.readBytes(32);
const wrap = (address) => checksum ? Address.checksum(address) : address;
return [wrap(Hex.fromBytes(Bytes.slice(value, -20))), 32];
}
/** @internal */
export function decodeArray(cursor, param, options) {
const { checksumAddress, length, staticPosition } = options;
// If the length of the array is not known in advance (dynamic array),
// this means we will need to wonder off to the pointer and decode.
if (!length) {
// Dealing with a dynamic type, so get the offset of the array data.
const offset = Bytes.toNumber(cursor.readBytes(sizeOfOffset));
// Start is the static position of current slot + offset.
const start = staticPosition + offset;
const startOfData = start + sizeOfLength;
// Get the length of the array from the offset.
cursor.setPosition(start);
const length = Bytes.toNumber(cursor.readBytes(sizeOfLength));
// Check if the array has any dynamic children.
const dynamicChild = hasDynamicChild(param);
let consumed = 0;
const value = [];
for (let i = 0; i < length; ++i) {
// If any of the children is dynamic, then all elements will be offset pointer, thus size of one slot (32 bytes).
// Otherwise, elements will be the size of their encoding (consumed bytes).
cursor.setPosition(startOfData + (dynamicChild ? i * 32 : consumed));
const [data, consumed_] = decodeParameter(cursor, param, {
checksumAddress,
staticPosition: startOfData,
});
consumed += consumed_;
value.push(data);
}
// As we have gone wondering, restore to the original position + next slot.
cursor.setPosition(staticPosition + 32);
return [value, 32];
}
// If the length of the array is known in advance,
// and the length of an element deeply nested in the array is not known,
// we need to decode the offset of the array data.
if (hasDynamicChild(param)) {
// Dealing with dynamic types, so get the offset of the array data.
const offset = Bytes.toNumber(cursor.readBytes(sizeOfOffset));
// Start is the static position of current slot + offset.
const start = staticPosition + offset;
const value = [];
for (let i = 0; i < length; ++i) {
// Move cursor along to the next slot (next offset pointer).
cursor.setPosition(start + i * 32);
const [data] = decodeParameter(cursor, param, {
checksumAddress,
staticPosition: start,
});
value.push(data);
}
// As we have gone wondering, restore to the original position + next slot.
cursor.setPosition(staticPosition + 32);
return [value, 32];
}
// If the length of the array is known in advance and the array is deeply static,
// then we can just decode each element in sequence.
let consumed = 0;
const value = [];
for (let i = 0; i < length; ++i) {
const [data, consumed_] = decodeParameter(cursor, param, {
checksumAddress,
staticPosition: staticPosition + consumed,
});
consumed += consumed_;
value.push(data);
}
return [value, consumed];
}
/** @internal */
export function decodeBool(cursor) {
return [Bytes.toBoolean(cursor.readBytes(32), { size: 32 }), 32];
}
/** @internal */
export function decodeBytes(cursor, param, { staticPosition }) {
const [_, size] = param.type.split('bytes');
if (!size) {
// Dealing with dynamic types, so get the offset of the bytes data.
const offset = Bytes.toNumber(cursor.readBytes(32));
// Set position of the cursor to start of bytes data.
cursor.setPosition(staticPosition + offset);
const length = Bytes.toNumber(cursor.readBytes(32));
// If there is no length, we have zero data.
if (length === 0) {
// As we have gone wondering, restore to the original position + next slot.
cursor.setPosition(staticPosition + 32);
return ['0x', 32];
}
const data = cursor.readBytes(length);
// As we have gone wondering, restore to the original position + next slot.
cursor.setPosition(staticPosition + 32);
return [Hex.fromBytes(data), 32];
}
const value = Hex.fromBytes(cursor.readBytes(Number.parseInt(size, 10), 32));
return [value, 32];
}
/** @internal */
export function decodeNumber(cursor, param) {
const signed = param.type.startsWith('int');
const size = Number.parseInt(param.type.split('int')[1] || '256', 10);
const value = cursor.readBytes(32);
return [
size > 48
? Bytes.toBigInt(value, { signed })
: Bytes.toNumber(value, { signed }),
32,
];
}
/** @internal */
export function decodeTuple(cursor, param, options) {
const { checksumAddress, staticPosition } = options;
// Tuples can have unnamed components (i.e. they are arrays), so we must
// determine whether the tuple is named or unnamed. In the case of a named
// tuple, the value will be an object where each property is the name of the
// component. In the case of an unnamed tuple, the value will be an array.
const hasUnnamedChild = param.components.length === 0 || param.components.some(({ name }) => !name);
// Initialize the value to an object or an array, depending on whether the
// tuple is named or unnamed.
const value = hasUnnamedChild ? [] : {};
let consumed = 0;
// If the tuple has a dynamic child, we must first decode the offset to the
// tuple data.
if (hasDynamicChild(param)) {
// Dealing with dynamic types, so get the offset of the tuple data.
const offset = Bytes.toNumber(cursor.readBytes(sizeOfOffset));
// Start is the static position of referencing slot + offset.
const start = staticPosition + offset;
for (let i = 0; i < param.components.length; ++i) {
const component = param.components[i];
cursor.setPosition(start + consumed);
const [data, consumed_] = decodeParameter(cursor, component, {
checksumAddress,
staticPosition: start,
});
consumed += consumed_;
value[hasUnnamedChild ? i : component?.name] = data;
}
// As we have gone wondering, restore to the original position + next slot.
cursor.setPosition(staticPosition + 32);
return [value, 32];
}
// If the tuple has static children, we can just decode each component
// in sequence.
for (let i = 0; i < param.components.length; ++i) {
const component = param.components[i];
const [data, consumed_] = decodeParameter(cursor, component, {
checksumAddress,
staticPosition,
});
value[hasUnnamedChild ? i : component?.name] = data;
consumed += consumed_;
}
return [value, consumed];
}
/** @internal */
export function decodeString(cursor, { staticPosition }) {
// Get offset to start of string data.
const offset = Bytes.toNumber(cursor.readBytes(32));
// Start is the static position of current slot + offset.
const start = staticPosition + offset;
cursor.setPosition(start);
const length = Bytes.toNumber(cursor.readBytes(32));
// If there is no length, we have zero data (empty string).
if (length === 0) {
cursor.setPosition(staticPosition + 32);
return ['', 32];
}
const data = cursor.readBytes(length, 32);
const value = Bytes.toString(Bytes.trimLeft(data));
// As we have gone wondering, restore to the original position + next slot.
cursor.setPosition(staticPosition + 32);
return [value, 32];
}
/** @internal */
export function prepareParameters({ checksumAddress, parameters, values, }) {
const preparedParameters = [];
for (let i = 0; i < parameters.length; i++) {
preparedParameters.push(prepareParameter({
checksumAddress,
parameter: parameters[i],
value: values[i],
}));
}
return preparedParameters;
}
/** @internal */
export function prepareParameter({ checksumAddress = false, parameter: parameter_, value, }) {
const parameter = parameter_;
const arrayComponents = getArrayComponents(parameter.type);
if (arrayComponents) {
const [length, type] = arrayComponents;
return encodeArray(value, {
checksumAddress,
length,
parameter: {
...parameter,
type,
},
});
}
if (parameter.type === 'tuple') {
return encodeTuple(value, {
checksumAddress,
parameter: parameter,
});
}
if (parameter.type === 'address') {
return encodeAddress(value, {
checksum: checksumAddress,
});
}
if (parameter.type === 'bool') {
return encodeBoolean(value);
}
if (parameter.type.startsWith('uint') || parameter.type.startsWith('int')) {
const signed = parameter.type.startsWith('int');
const [, , size = '256'] = integerRegex.exec(parameter.type) ?? [];
return encodeNumber(value, {
signed,
size: Number(size),
});
}
if (parameter.type.startsWith('bytes')) {
return encodeBytes(value, { type: parameter.type });
}
if (parameter.type === 'string') {
return encodeString(value);
}
throw new AbiParameters.InvalidTypeError(parameter.type);
}
/** @internal */
export function encode(preparedParameters) {
// 1. Compute the size of the static part of the parameters.
let staticSize = 0;
for (let i = 0; i < preparedParameters.length; i++) {
const { dynamic, encoded } = preparedParameters[i];
if (dynamic)
staticSize += 32;
else
staticSize += Hex.size(encoded);
}
// 2. Split the parameters into static and dynamic parts.
const staticParameters = [];
const dynamicParameters = [];
let dynamicSize = 0;
for (let i = 0; i < preparedParameters.length; i++) {
const { dynamic, encoded } = preparedParameters[i];
if (dynamic) {
staticParameters.push(Hex.fromNumber(staticSize + dynamicSize, { size: 32 }));
dynamicParameters.push(encoded);
dynamicSize += Hex.size(encoded);
}
else {
staticParameters.push(encoded);
}
}
// 3. Concatenate static and dynamic parts.
return Hex.concat(...staticParameters, ...dynamicParameters);
}
/** @internal */
export function encodeAddress(value, options) {
const { checksum = false } = options;
Address.assert(value, { strict: checksum });
return {
dynamic: false,
encoded: Hex.padLeft(value.toLowerCase()),
};
}
/** @internal */
export function encodeArray(value, options) {
const { checksumAddress, length, parameter } = options;
const dynamic = length === null;
if (!Array.isArray(value))
throw new AbiParameters.InvalidArrayError(value);
if (!dynamic && value.length !== length)
throw new AbiParameters.ArrayLengthMismatchError({
expectedLength: length,
givenLength: value.length,
type: `${parameter.type}[${length}]`,
});
let dynamicChild = false;
const preparedParameters = [];
for (let i = 0; i < value.length; i++) {
const preparedParam = prepareParameter({
checksumAddress,
parameter,
value: value[i],
});
if (preparedParam.dynamic)
dynamicChild = true;
preparedParameters.push(preparedParam);
}
if (dynamic || dynamicChild) {
const data = encode(preparedParameters);
if (dynamic) {
const length = Hex.fromNumber(preparedParameters.length, { size: 32 });
return {
dynamic: true,
encoded: preparedParameters.length > 0 ? Hex.concat(length, data) : length,
};
}
if (dynamicChild)
return { dynamic: true, encoded: data };
}
return {
dynamic: false,
encoded: Hex.concat(...preparedParameters.map(({ encoded }) => encoded)),
};
}
/** @internal */
export function encodeBytes(value, { type }) {
const [, parametersize] = type.split('bytes');
const bytesSize = Hex.size(value);
if (!parametersize) {
let value_ = value;
// If the size is not divisible by 32 bytes, pad the end
// with empty bytes to the ceiling 32 bytes.
if (bytesSize % 32 !== 0)
value_ = Hex.padRight(value_, Math.ceil((value.length - 2) / 2 / 32) * 32);
return {
dynamic: true,
encoded: Hex.concat(Hex.padLeft(Hex.fromNumber(bytesSize, { size: 32 })), value_),
};
}
if (bytesSize !== Number.parseInt(parametersize, 10))
throw new AbiParameters.BytesSizeMismatchError({
expectedSize: Number.parseInt(parametersize, 10),
value,
});
return { dynamic: false, encoded: Hex.padRight(value) };
}
/** @internal */
export function encodeBoolean(value) {
if (typeof value !== 'boolean')
throw new Errors.BaseError(`Invalid boolean value: "${value}" (type: ${typeof value}). Expected: \`true\` or \`false\`.`);
return { dynamic: false, encoded: Hex.padLeft(Hex.fromBoolean(value)) };
}
/** @internal */
export function encodeNumber(value, { signed, size }) {
if (typeof size === 'number') {
const max = 2n ** (BigInt(size) - (signed ? 1n : 0n)) - 1n;
const min = signed ? -max - 1n : 0n;
if (value > max || value < min)
throw new Hex.IntegerOutOfRangeError({
max: max.toString(),
min: min.toString(),
signed,
size: size / 8,
value: value.toString(),
});
}
return {
dynamic: false,
encoded: Hex.fromNumber(value, {
size: 32,
signed,
}),
};
}
/** @internal */
export function encodeString(value) {
const hexValue = Hex.fromString(value);
const partsLength = Math.ceil(Hex.size(hexValue) / 32);
const parts = [];
for (let i = 0; i < partsLength; i++) {
parts.push(Hex.padRight(Hex.slice(hexValue, i * 32, (i + 1) * 32)));
}
return {
dynamic: true,
encoded: Hex.concat(Hex.padRight(Hex.fromNumber(Hex.size(hexValue), { size: 32 })), ...parts),
};
}
/** @internal */
export function encodeTuple(value, options) {
const { checksumAddress, parameter } = options;
let dynamic = false;
const preparedParameters = [];
for (let i = 0; i < parameter.components.length; i++) {
const param_ = parameter.components[i];
const index = Array.isArray(value) ? i : param_.name;
const preparedParam = prepareParameter({
checksumAddress,
parameter: param_,
value: value[index],
});
preparedParameters.push(preparedParam);
if (preparedParam.dynamic)
dynamic = true;
}
return {
dynamic,
encoded: dynamic
? encode(preparedParameters)
: Hex.concat(...preparedParameters.map(({ encoded }) => encoded)),
};
}
/** @internal */
export function getArrayComponents(type) {
const matches = type.match(/^(.*)\[(\d+)?\]$/);
return matches
? // Return `null` if the array is dynamic.
[matches[2] ? Number(matches[2]) : null, matches[1]]
: undefined;
}
/** @internal */
export function hasDynamicChild(param) {
const { type } = param;
if (type === 'string')
return true;
if (type === 'bytes')
return true;
if (type.endsWith('[]'))
return true;
if (type === 'tuple')
return param.components?.some(hasDynamicChild);
const arrayComponents = getArrayComponents(param.type);
if (arrayComponents &&
hasDynamicChild({
...param,
type: arrayComponents[1],
}))
return true;
return false;
}
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