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Basic EIP712 encoder

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This commit is contained in:
Jacob Evans
2018-06-07 16:03:14 -07:00
parent a59e9f024e
commit a8d328bfc9
3 changed files with 61 additions and 40 deletions
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61
packages/order-utils/src/eip712_utils.ts
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@@ -2,6 +2,7 @@ import { BigNumber } from '@0xproject/utils';
import ethUtil = require('ethereumjs-util');
import * as _ from 'lodash';
import { assetProxyUtils } from './asset_proxy_utils';
import { crypto } from './crypto';
import { EIP712Schema } from './types';
@@ -19,6 +20,14 @@ const EIP712_DOMAIN_SCHEMA: EIP712Schema = {
],
};
enum EIP712Types {
String = 'string',
Bytes = 'bytes',
Address = 'address',
Bytes32 = 'bytes32',
Uint256 = 'uint256',
}
export const EIP712Utils = {
/**
* Compiles the EIP712Schema and returns the hash of the schema.
@@ -26,9 +35,7 @@ export const EIP712Utils = {
* @return The hash of the compiled schema
*/
compileSchema(schema: EIP712Schema): Buffer {
const namedTypes = _.map(schema.parameters, parameter => `${parameter.type} ${parameter.name}`);
const namedTypesJoined = namedTypes.join(',');
const eip712Schema = `${schema.name}(${namedTypesJoined})`;
const eip712Schema = EIP712Utils._encodeType(schema);
const eip712SchemaHashBuffer = crypto.solSHA3([eip712Schema]);
return eip712SchemaHashBuffer;
},
@@ -57,14 +64,44 @@ export const EIP712Utils = {
},
_getDomainSeparatorHashBuffer(exchangeAddress: string): Buffer {
const domainSeparatorSchemaBuffer = EIP712Utils._getDomainSeparatorSchemaBuffer();
const nameHash = crypto.solSHA3([EIP712_DOMAIN_NAME]);
const versionHash = crypto.solSHA3([EIP712_DOMAIN_VERSION]);
const domainSeparatorHashBuff = crypto.solSHA3([
domainSeparatorSchemaBuffer,
nameHash,
versionHash,
EIP712Utils.pad32Address(exchangeAddress),
]);
return domainSeparatorHashBuff;
const encodedData = EIP712Utils._encodeData(EIP712_DOMAIN_SCHEMA, {
name: EIP712_DOMAIN_NAME,
version: EIP712_DOMAIN_VERSION,
contract: exchangeAddress,
});
const domainSeparatorHashBuff2 = crypto.solSHA3([domainSeparatorSchemaBuffer, ...encodedData]);
return domainSeparatorHashBuff2;
},
_encodeType(schema: EIP712Schema): string {
const namedTypes = _.map(schema.parameters, ({ name, type }) => `${type} ${name}`);
const namedTypesJoined = namedTypes.join(',');
const encodedType = `${schema.name}(${namedTypesJoined})`;
return encodedType;
},
_encodeData(schema: EIP712Schema, data: { [key: string]: any }): any {
const encodedTypes = [];
const encodedValues = [];
for (const parameter of schema.parameters) {
const value = data[parameter.name];
if (parameter.type === EIP712Types.String || parameter.type === EIP712Types.Bytes) {
encodedTypes.push(EIP712Types.Bytes32);
encodedValues.push(crypto.solSHA3([ethUtil.toBuffer(value)]));
} else if (parameter.type === EIP712Types.Uint256) {
encodedTypes.push(EIP712Types.Uint256);
encodedValues.push(value);
} else if (parameter.type === EIP712Types.Address) {
encodedTypes.push(EIP712Types.Address);
encodedValues.push(EIP712Utils.pad32Address(value));
} else {
throw new Error(`Unable to encode ${parameter.type}`);
}
}
return encodedValues;
},
structHash(schema: EIP712Schema, data: { [key: string]: any }): Buffer {
const encodedData = EIP712Utils._encodeData(schema, data);
const schemaHash = EIP712Utils.compileSchema(schema);
const hashBuffer = crypto.solSHA3([schemaHash, ...encodedData]);
return hashBuffer;
},
};