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1x 1x 1x 1x 554x 554x 554x 554x 554x 554x 10x 10x 10x 10x 10x 10x 10x 10x 50x 50x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 32x 32x 32x 32x 32x 32x 22x 22x 10x 10x 32x 32x 32x 10x 10x 32x 10x 10x 10x 554x 1x 1x 1x 1x 1x | //import { TypedDataDomain, TypedDataField } from "@ethersproject/providerabstract-signer";
import { getAddress } from "../address/index.js";
import { keccak256 } from "../crypto/index.js";
import { recoverAddress } from "../transaction/index.js";
import {
concat, defineProperties, getBigInt, getBytes, hexlify, isHexString, mask, toBeHex, toQuantity, toTwos, zeroPadValue,
assertArgument
} from "../utils/index.js";
import { id } from "./id.js";
import type { SignatureLike } from "../crypto/index.js";
import type { BigNumberish, BytesLike } from "../utils/index.js";
const padding = new Uint8Array(32);
padding.fill(0);
const BN__1 = BigInt(-1);
const BN_0 = BigInt(0);
const BN_1 = BigInt(1);
const BN_MAX_UINT256 = BigInt("0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
// @TODO: in v7, verifyingContract should be an AddressLike and use resolveAddress
/**
* The domain for an [[link-eip-712]] payload.
*/
export interface TypedDataDomain {
/**
* The human-readable name of the signing domain.
*/
name?: null | string;
/**
* The major version of the signing domain.
*/
version?: null | string;
/**
* The chain ID of the signing domain.
*/
chainId?: null | BigNumberish;
/**
* The the address of the contract that will verify the signature.
*/
verifyingContract?: null | string;
/**
* A salt used for purposes decided by the specific domain.
*/
salt?: null | BytesLike;
};
/**
* A specific field of a structured [[link-eip-712]] type.
*/
export interface TypedDataField {
/**
* The field name.
*/
name: string;
/**
* The type of the field.
*/
type: string;
};
function hexPadRight(value: BytesLike): string {
const bytes = getBytes(value);
const padOffset = bytes.length % 32
if (padOffset) {
return concat([ bytes, padding.slice(padOffset) ]);
}
return hexlify(bytes);
}
const hexTrue = toBeHex(BN_1, 32);
const hexFalse = toBeHex(BN_0, 32);
const domainFieldTypes: Record<string, string> = {
name: "string",
version: "string",
chainId: "uint256",
verifyingContract: "address",
salt: "bytes32"
};
const domainFieldNames: Array<string> = [
"name", "version", "chainId", "verifyingContract", "salt"
];
function checkString(key: string): (value: any) => string {
return function (value: any){
assertArgument(typeof(value) === "string", `invalid domain value for ${ JSON.stringify(key) }`, `domain.${ key }`, value);
return value;
}
}
const domainChecks: Record<string, (value: any) => any> = {
name: checkString("name"),
version: checkString("version"),
chainId: function(_value: any) {
const value = getBigInt(_value, "domain.chainId");
assertArgument(value >= 0, "invalid chain ID", "domain.chainId", _value);
if (Number.isSafeInteger(value)) { return Number(value); }
return toQuantity(value);
},
verifyingContract: function(value: any) {
try {
return getAddress(value).toLowerCase();
} catch (error) { }
assertArgument(false, `invalid domain value "verifyingContract"`, "domain.verifyingContract", value);
},
salt: function(value: any) {
const bytes = getBytes(value, "domain.salt");
assertArgument(bytes.length === 32, `invalid domain value "salt"`, "domain.salt", value);
return hexlify(bytes);
}
}
function getBaseEncoder(type: string): null | ((value: any) => string) {
// intXX and uintXX
{
const match = type.match(/^(u?)int(\d+)$/);
if (match) {
const signed = (match[1] === "");
const width = parseInt(match[2]);
assertArgument(width % 8 === 0 && width !== 0 && width <= 256 && match[2] === String(width), "invalid numeric width", "type", type);
const boundsUpper = mask(BN_MAX_UINT256, signed ? (width - 1): width);
const boundsLower = signed ? ((boundsUpper + BN_1) * BN__1): BN_0;
return function(_value: BigNumberish) {
const value = getBigInt(_value, "value");
assertArgument(value >= boundsLower && value <= boundsUpper, `value out-of-bounds for ${ type }`, "value", value);
return toBeHex(signed ? toTwos(value, 256): value, 32);
};
}
}
// bytesXX
{
const match = type.match(/^bytes(\d+)$/);
if (match) {
const width = parseInt(match[1]);
assertArgument(width !== 0 && width <= 32 && match[1] === String(width), "invalid bytes width", "type", type);
return function(value: BytesLike) {
const bytes = getBytes(value);
assertArgument(bytes.length === width, `invalid length for ${ type }`, "value", value);
return hexPadRight(value);
};
}
}
switch (type) {
case "address": return function(value: string) {
return zeroPadValue(getAddress(value), 32);
};
case "bool": return function(value: boolean) {
return ((!value) ? hexFalse: hexTrue);
};
case "bytes": return function(value: BytesLike) {
return keccak256(value);
};
case "string": return function(value: string) {
return id(value);
};
}
return null;
}
function encodeType(name: string, fields: Array<TypedDataField>): string {
return `${ name }(${ fields.map(({ name, type }) => (type + " " + name)).join(",") })`;
}
type ArrayResult = {
base: string; // The base type
index?: string; // the full Index (if any)
array?: { // The Array... (if index)
base: string; // ...base type (same as above)
prefix: string; // ...sans the final Index
count: number; // ...the final Index (-1 for dynamic)
}
};
// foo[][3] => { base: "foo", index: "[][3]", array: {
// base: "foo", prefix: "foo[]", count: 3 } }
function splitArray(type: string): ArrayResult {
const match = type.match(/^([^\x5b]*)((\x5b\d*\x5d)*)(\x5b(\d*)\x5d)$/);
if (match) {
return {
base: match[1],
index: (match[2] + match[4]),
array: {
base: match[1],
prefix: (match[1] + match[2]),
count: (match[5] ? parseInt(match[5]): -1),
}
};
}
return { base: type };
}
/**
* A **TypedDataEncode** prepares and encodes [[link-eip-712]] payloads
* for signed typed data.
*
* This is useful for those that wish to compute various components of a
* typed data hash, primary types, or sub-components, but generally the
* higher level [[Signer-signTypedData]] is more useful.
*/
export class TypedDataEncoder {
/**
* The primary type for the structured [[types]].
*
* This is derived automatically from the [[types]], since no
* recursion is possible, once the DAG for the types is consturcted
* internally, the primary type must be the only remaining type with
* no parent nodes.
*/
readonly primaryType!: string;
readonly #types: string;
/**
* The types.
*/
get types(): Record<string, Array<TypedDataField>> {
return JSON.parse(this.#types);
}
readonly #fullTypes: Map<string, string>
readonly #encoderCache: Map<string, (value: any) => string>;
/**
* Create a new **TypedDataEncoder** for %%types%%.
*
* This performs all necessary checking that types are valid and
* do not violate the [[link-eip-712]] structural constraints as
* well as computes the [[primaryType]].
*/
constructor(_types: Record<string, Array<TypedDataField>>) {
this.#fullTypes = new Map();
this.#encoderCache = new Map();
// Link struct types to their direct child structs
const links: Map<string, Set<string>> = new Map();
// Link structs to structs which contain them as a child
const parents: Map<string, Array<string>> = new Map();
// Link all subtypes within a given struct
const subtypes: Map<string, Set<string>> = new Map();
const types: Record<string, Array<TypedDataField>> = { };
Object.keys(_types).forEach((type) => {
types[type] = _types[type].map(({ name, type }) => {
// Normalize the base type (unless name conflict)
let { base, index } = splitArray(type);
if (base === "int" && !_types["int"]) { base = "int256"; }
if (base === "uint" && !_types["uint"]) { base = "uint256"; }
return { name, type: (base + (index || "")) };
});
links.set(type, new Set());
parents.set(type, [ ]);
subtypes.set(type, new Set());
});
this.#types = JSON.stringify(types);
for (const name in types) {
const uniqueNames: Set<string> = new Set();
for (const field of types[name]) {
// Check each field has a unique name
assertArgument(!uniqueNames.has(field.name), `duplicate variable name ${ JSON.stringify(field.name) } in ${ JSON.stringify(name) }`, "types", _types);
uniqueNames.add(field.name);
// Get the base type (drop any array specifiers)
const baseType = splitArray(field.type).base;
assertArgument(baseType !== name, `circular type reference to ${ JSON.stringify(baseType) }`, "types", _types);
// Is this a base encoding type?
const encoder = getBaseEncoder(baseType);
if (encoder) { continue; }
assertArgument(parents.has(baseType), `unknown type ${ JSON.stringify(baseType) }`, "types", _types);
// Add linkage
(parents.get(baseType) as Array<string>).push(name);
(links.get(name) as Set<string>).add(baseType);
}
}
// Deduce the primary type
const primaryTypes = Array.from(parents.keys()).filter((n) => ((parents.get(n) as Array<string>).length === 0));
assertArgument(primaryTypes.length !== 0, "missing primary type", "types", _types);
assertArgument(primaryTypes.length === 1, `ambiguous primary types or unused types: ${ primaryTypes.map((t) => (JSON.stringify(t))).join(", ") }`, "types", _types);
defineProperties<TypedDataEncoder>(this, { primaryType: primaryTypes[0] });
// Check for circular type references
function checkCircular(type: string, found: Set<string>) {
assertArgument(!found.has(type), `circular type reference to ${ JSON.stringify(type) }`, "types", _types);
found.add(type);
for (const child of (links.get(type) as Set<string>)) {
if (!parents.has(child)) { continue; }
// Recursively check children
checkCircular(child, found);
// Mark all ancestors as having this decendant
for (const subtype of found) {
(subtypes.get(subtype) as Set<string>).add(child);
}
}
found.delete(type);
}
checkCircular(this.primaryType, new Set());
// Compute each fully describe type
for (const [ name, set ] of subtypes) {
const st = Array.from(set);
st.sort();
this.#fullTypes.set(name, encodeType(name, types[name]) + st.map((t) => encodeType(t, types[t])).join(""));
}
}
/**
* Returnthe encoder for the specific %%type%%.
*/
getEncoder(type: string): (value: any) => string {
let encoder = this.#encoderCache.get(type);
if (!encoder) {
encoder = this.#getEncoder(type);
this.#encoderCache.set(type, encoder);
}
return encoder;
}
#getEncoder(type: string): (value: any) => string {
// Basic encoder type (address, bool, uint256, etc)
{
const encoder = getBaseEncoder(type);
if (encoder) { return encoder; }
}
// Array
const array = splitArray(type).array;
if (array) {
const subtype = array.prefix;
const subEncoder = this.getEncoder(subtype);
return (value: Array<any>) => {
assertArgument(array.count === -1 || array.count === value.length, `array length mismatch; expected length ${ array.count }`, "value", value);
let result = value.map(subEncoder);
if (this.#fullTypes.has(subtype)) {
result = result.map(keccak256);
}
return keccak256(concat(result));
};
}
// Struct
const fields = this.types[type];
if (fields) {
const encodedType = id(this.#fullTypes.get(type) as string);
return (value: Record<string, any>) => {
const values = fields.map(({ name, type }) => {
const result = this.getEncoder(type)(value[name]);
if (this.#fullTypes.has(type)) { return keccak256(result); }
return result;
});
values.unshift(encodedType);
return concat(values);
}
}
assertArgument(false, `unknown type: ${ type }`, "type", type);
}
/**
* Return the full type for %%name%%.
*/
encodeType(name: string): string {
const result = this.#fullTypes.get(name);
assertArgument(result, `unknown type: ${ JSON.stringify(name) }`, "name", name);
return result;
}
/**
* Return the encoded %%value%% for the %%type%%.
*/
encodeData(type: string, value: any): string {
return this.getEncoder(type)(value);
}
/**
* Returns the hash of %%value%% for the type of %%name%%.
*/
hashStruct(name: string, value: Record<string, any>): string {
return keccak256(this.encodeData(name, value));
}
/**
* Return the fulled encoded %%value%% for the [[types]].
*/
encode(value: Record<string, any>): string {
return this.encodeData(this.primaryType, value);
}
/**
* Return the hash of the fully encoded %%value%% for the [[types]].
*/
hash(value: Record<string, any>): string {
return this.hashStruct(this.primaryType, value);
}
/**
* @_ignore:
*/
_visit(type: string, value: any, callback: (type: string, data: any) => any): any {
// Basic encoder type (address, bool, uint256, etc)
{
const encoder = getBaseEncoder(type);
if (encoder) { return callback(type, value); }
}
// Array
const array = splitArray(type).array;
if (array) {
assertArgument(array.count === -1 || array.count === value.length, `array length mismatch; expected length ${ array.count }`, "value", value);
return value.map((v: any) => this._visit(array.prefix, v, callback));
}
// Struct
const fields = this.types[type];
if (fields) {
return fields.reduce((accum, { name, type }) => {
accum[name] = this._visit(type, value[name], callback);
return accum;
}, <Record<string, any>>{});
}
assertArgument(false, `unknown type: ${ type }`, "type", type);
}
/**
* Call %%calback%% for each value in %%value%%, passing the type and
* component within %%value%%.
*
* This is useful for replacing addresses or other transformation that
* may be desired on each component, based on its type.
*/
visit(value: Record<string, any>, callback: (type: string, data: any) => any): any {
return this._visit(this.primaryType, value, callback);
}
/**
* Create a new **TypedDataEncoder** for %%types%%.
*/
static from(types: Record<string, Array<TypedDataField>>): TypedDataEncoder {
return new TypedDataEncoder(types);
}
/**
* Return the primary type for %%types%%.
*/
static getPrimaryType(types: Record<string, Array<TypedDataField>>): string {
return TypedDataEncoder.from(types).primaryType;
}
/**
* Return the hashed struct for %%value%% using %%types%% and %%name%%.
*/
static hashStruct(name: string, types: Record<string, Array<TypedDataField>>, value: Record<string, any>): string {
return TypedDataEncoder.from(types).hashStruct(name, value);
}
/**
* Return the domain hash for %%domain%%.
*/
static hashDomain(domain: TypedDataDomain): string {
const domainFields: Array<TypedDataField> = [ ];
for (const name in domain) {
if ((<Record<string, any>>domain)[name] == null) { continue; }
const type = domainFieldTypes[name];
assertArgument(type, `invalid typed-data domain key: ${ JSON.stringify(name) }`, "domain", domain);
domainFields.push({ name, type });
}
domainFields.sort((a, b) => {
return domainFieldNames.indexOf(a.name) - domainFieldNames.indexOf(b.name);
});
return TypedDataEncoder.hashStruct("EIP712Domain", { EIP712Domain: domainFields }, domain);
}
/**
* Return the fully encoded [[link-eip-712]] %%value%% for %%types%% with %%domain%%.
*/
static encode(domain: TypedDataDomain, types: Record<string, Array<TypedDataField>>, value: Record<string, any>): string {
return concat([
"0x1901",
TypedDataEncoder.hashDomain(domain),
TypedDataEncoder.from(types).hash(value)
]);
}
/**
* Return the hash of the fully encoded [[link-eip-712]] %%value%% for %%types%% with %%domain%%.
*/
static hash(domain: TypedDataDomain, types: Record<string, Array<TypedDataField>>, value: Record<string, any>): string {
return keccak256(TypedDataEncoder.encode(domain, types, value));
}
// Replaces all address types with ENS names with their looked up address
/**
* Resolves to the value from resolving all addresses in %%value%% for
* %%types%% and the %%domain%%.
*/
static async resolveNames(domain: TypedDataDomain, types: Record<string, Array<TypedDataField>>, value: Record<string, any>, resolveName: (name: string) => Promise<string>): Promise<{ domain: TypedDataDomain, value: any }> {
// Make a copy to isolate it from the object passed in
domain = Object.assign({ }, domain);
// Allow passing null to ignore value
for (const key in domain) {
if ((<Record<string, any>>domain)[key] == null) {
delete (<Record<string, any>>domain)[key];
}
}
// Look up all ENS names
const ensCache: Record<string, string> = { };
// Do we need to look up the domain's verifyingContract?
if (domain.verifyingContract && !isHexString(domain.verifyingContract, 20)) {
ensCache[domain.verifyingContract] = "0x";
}
// We are going to use the encoder to visit all the base values
const encoder = TypedDataEncoder.from(types);
// Get a list of all the addresses
encoder.visit(value, (type: string, value: any) => {
if (type === "address" && !isHexString(value, 20)) {
ensCache[value] = "0x";
}
return value;
});
// Lookup each name
for (const name in ensCache) {
ensCache[name] = await resolveName(name);
}
// Replace the domain verifyingContract if needed
if (domain.verifyingContract && ensCache[domain.verifyingContract]) {
domain.verifyingContract = ensCache[domain.verifyingContract];
}
// Replace all ENS names with their address
value = encoder.visit(value, (type: string, value: any) => {
if (type === "address" && ensCache[value]) { return ensCache[value]; }
return value;
});
return { domain, value };
}
/**
* Returns the JSON-encoded payload expected by nodes which implement
* the JSON-RPC [[link-eip-712]] method.
*/
static getPayload(domain: TypedDataDomain, types: Record<string, Array<TypedDataField>>, value: Record<string, any>): any {
// Validate the domain fields
TypedDataEncoder.hashDomain(domain);
// Derive the EIP712Domain Struct reference type
const domainValues: Record<string, any> = { };
const domainTypes: Array<{ name: string, type:string }> = [ ];
domainFieldNames.forEach((name) => {
const value = (<any>domain)[name];
if (value == null) { return; }
domainValues[name] = domainChecks[name](value);
domainTypes.push({ name, type: domainFieldTypes[name] });
});
const encoder = TypedDataEncoder.from(types);
// Get the normalized types
types = encoder.types;
const typesWithDomain = Object.assign({ }, types);
assertArgument(typesWithDomain.EIP712Domain == null, "types must not contain EIP712Domain type", "types.EIP712Domain", types);
typesWithDomain.EIP712Domain = domainTypes;
// Validate the data structures and types
encoder.encode(value);
return {
types: typesWithDomain,
domain: domainValues,
primaryType: encoder.primaryType,
message: encoder.visit(value, (type: string, value: any) => {
// bytes
if (type.match(/^bytes(\d*)/)) {
return hexlify(getBytes(value));
}
// uint or int
if (type.match(/^u?int/)) {
return getBigInt(value).toString();
}
switch (type) {
case "address":
return value.toLowerCase();
case "bool":
return !!value;
case "string":
assertArgument(typeof(value) === "string", "invalid string", "value", value);
return value;
}
assertArgument(false, "unsupported type", "type", type);
})
};
}
}
/**
* Compute the address used to sign the typed data for the %%signature%%.
*/
export function verifyTypedData(domain: TypedDataDomain, types: Record<string, Array<TypedDataField>>, value: Record<string, any>, signature: SignatureLike): string {
return recoverAddress(TypedDataEncoder.hash(domain, types, value), signature);
}
|