1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
import * as ethUtil from 'ethereumjs-util';
import * as ethers from 'ethers';
import { EIP712TypedData, EIP712Types } from '@0xproject/types';
export const signTypedDataUtils = {
/**
* Computes the Sign Typed Data hash
* @param typedData An object that conforms to the EIP712TypedData interface
* @return A Buffer containing the hash of the sign typed data.
*/
signTypedDataHash(typedData: EIP712TypedData): Buffer {
return ethUtil.sha3(
Buffer.concat([
Buffer.from('1901', 'hex'),
signTypedDataUtils._structHash('EIP712Domain', typedData.domain, typedData.types),
signTypedDataUtils._structHash(typedData.primaryType, typedData.message, typedData.types),
]),
);
},
_findDependencies(primaryType: string, types: EIP712Types, found: string[] = []): string[] {
if (found.includes(primaryType) || types[primaryType] === undefined) {
return found;
}
found.push(primaryType);
for (const field of types[primaryType]) {
for (const dep of signTypedDataUtils._findDependencies(field.type, types, found)) {
if (!found.includes(dep)) {
found.push(dep);
}
}
}
return found;
},
_encodeType(primaryType: string, types: EIP712Types): string {
let deps = signTypedDataUtils._findDependencies(primaryType, types);
deps = deps.filter(d => d !== primaryType);
deps = [primaryType].concat(deps.sort());
let result = '';
for (const dep of deps) {
result += `${dep}(${types[dep].map(({ name, type }) => `${type} ${name}`).join(',')})`;
}
return result;
},
_encodeData(primaryType: string, data: any, types: EIP712Types): string {
const encodedTypes = ['bytes32'];
const encodedValues = [signTypedDataUtils._typeHash(primaryType, types)];
for (const field of types[primaryType]) {
let value = data[field.name];
if (field.type === 'string' || field.type === 'bytes') {
value = ethUtil.sha3(value);
encodedTypes.push('bytes32');
encodedValues.push(value);
} else if (types[field.type] !== undefined) {
encodedTypes.push('bytes32');
value = ethUtil.sha3(signTypedDataUtils._encodeData(field.type, value, types));
encodedValues.push(value);
} else if (field.type.lastIndexOf(']') === field.type.length - 1) {
throw new Error('Arrays currently unimplemented in encodeData');
} else {
encodedTypes.push(field.type);
encodedValues.push(value);
}
}
return ethers.utils.defaultAbiCoder.encode(encodedTypes, encodedValues);
},
_typeHash(primaryType: string, types: EIP712Types): Buffer {
return ethUtil.sha3(signTypedDataUtils._encodeType(primaryType, types));
},
_structHash(primaryType: string, data: any, types: EIP712Types): Buffer {
return ethUtil.sha3(signTypedDataUtils._encodeData(primaryType, data, types));
},
};
|
