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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
import { AbiDefinition, AbiType, ContractAbi, DataItem, MethodAbi } from 'ethereum-types';
import * as ethers from 'ethers';
import * as _ from 'lodash';
import { BigNumber } from './configured_bignumber';
// Note(albrow): This function is unexported in ethers.js. Copying it here for
// now.
// Source: https://github.com/ethers-io/ethers.js/blob/884593ab76004a808bf8097e9753fb5f8dcc3067/contracts/interface.js#L30
function parseEthersParams(params: DataItem[]): { names: ethers.ParamName[]; types: string[] } {
const names: ethers.ParamName[] = [];
const types: string[] = [];
params.forEach((param: DataItem) => {
if (param.components != null) {
let suffix = '';
const arrayBracket = param.type.indexOf('[');
if (arrayBracket >= 0) {
suffix = param.type.substring(arrayBracket);
}
const result = parseEthersParams(param.components);
names.push({ name: param.name || null, names: result.names });
types.push('tuple(' + result.types.join(',') + ')' + suffix);
} else {
names.push(param.name || null);
types.push(param.type);
}
});
return {
names,
types,
};
}
// returns true if x is equal to y and false otherwise. Performs some minimal
// type conversion and data massaging for x and y, depending on type. name and
// type should typically be derived from parseEthersParams.
function isAbiDataEqual(name: ethers.ParamName, type: string, x: any, y: any): boolean {
if (_.isUndefined(x) && _.isUndefined(y)) {
return true;
} else if (_.isUndefined(x) && !_.isUndefined(y)) {
return false;
} else if (!_.isUndefined(x) && _.isUndefined(y)) {
return false;
}
if (_.endsWith(type, '[]')) {
// For array types, we iterate through the elements and check each one
// individually. Strangely, name does not need to be changed in this
// case.
if (x.length !== y.length) {
return false;
}
const newType = _.trimEnd(type, '[]');
for (let i = 0; i < x.length; i++) {
if (!isAbiDataEqual(name, newType, x[i], y[i])) {
return false;
}
}
return true;
}
if (_.startsWith(type, 'tuple(')) {
if (_.isString(name)) {
throw new Error('Internal error: type was tuple but names was a string');
} else if (_.isNull(name)) {
throw new Error('Internal error: type was tuple but names was null');
}
// For tuples, we iterate through the underlying values and check each
// one individually.
const types = splitTupleTypes(type);
if (types.length !== name.names.length) {
throw new Error(
`Internal error: parameter types/names length mismatch (${types.length} != ${name.names.length})`,
);
}
for (let i = 0; i < types.length; i++) {
// For tuples, name is an object with a names property that is an
// array. As an example, for orders, name looks like:
//
// {
// name: 'orders',
// names: [
// 'makerAddress',
// // ...
// 'takerAssetData'
// ]
// }
//
const nestedName = _.isString(name.names[i])
? (name.names[i] as string)
: ((name.names[i] as ethers.NestedParamName).name as string);
if (!isAbiDataEqual(name.names[i], types[i], x[nestedName], y[nestedName])) {
return false;
}
}
return true;
} else if (type === 'address' || type === 'bytes') {
// HACK(albrow): ethers.js returns the checksummed address even when
// initially passed in a non-checksummed address. To account for that,
// we convert to lowercase before comparing.
return _.isEqual(_.toLower(x), _.toLower(y));
} else if (_.startsWith(type, 'uint') || _.startsWith(type, 'int')) {
return new BigNumber(x).eq(new BigNumber(y));
}
return _.isEqual(x, y);
}
// splitTupleTypes splits a tuple type string (of the form `tuple(X)` where X is
// any other type or list of types) into its component types. It works with
// nested tuples, so, e.g., `tuple(tuple(uint256,address),bytes32)` will yield:
// `['tuple(uint256,address)', 'bytes32']`. It expects exactly one tuple type as
// an argument (not an array).
function splitTupleTypes(type: string): string[] {
if (_.endsWith(type, '[]')) {
throw new Error('Internal error: array types are not supported');
} else if (!_.startsWith(type, 'tuple(')) {
throw new Error('Internal error: expected tuple type but got non-tuple type: ' + type);
}
// Trim the outtermost tuple().
const trimmedType = type.substring('tuple('.length, type.length - 1);
const types: string[] = [];
let currToken = '';
let parenCount = 0;
// Tokenize the type string while keeping track of parentheses.
for (const char of trimmedType) {
switch (char) {
case '(':
parenCount += 1;
currToken += char;
break;
case ')':
parenCount -= 1;
currToken += char;
break;
case ',':
if (parenCount === 0) {
types.push(currToken);
currToken = '';
break;
} else {
currToken += char;
break;
}
default:
currToken += char;
break;
}
}
types.push(currToken);
return types;
}
export const abiUtils = {
parseEthersParams,
isAbiDataEqual,
splitTupleTypes,
parseFunctionParam(param: DataItem): string {
if (param.type === 'tuple') {
// Parse out tuple types into {type_1, type_2, ..., type_N}
const tupleComponents = param.components;
const paramString = _.map(tupleComponents, component => abiUtils.parseFunctionParam(component));
const tupleParamString = `{${paramString}}`;
return tupleParamString;
}
return param.type;
},
getFunctionSignature(methodAbi: MethodAbi): string {
const functionName = methodAbi.name;
const parameterTypeList = _.map(methodAbi.inputs, (param: DataItem) => abiUtils.parseFunctionParam(param));
const functionSignature = `${functionName}(${parameterTypeList})`;
return functionSignature;
},
/**
* Solidity supports function overloading whereas TypeScript does not.
* See: https://solidity.readthedocs.io/en/v0.4.21/contracts.html?highlight=overload#function-overloading
* In order to support overloaded functions, we suffix overloaded function names with an index.
* This index should be deterministic, regardless of function ordering within the smart contract. To do so,
* we assign indexes based on the alphabetical order of function signatures.
*
* E.g
* ['f(uint)', 'f(uint,byte32)']
* Should always be renamed to:
* ['f1(uint)', 'f2(uint,byte32)']
* Regardless of the order in which these these overloaded functions are declared within the contract ABI.
*/
renameOverloadedMethods(inputContractAbi: ContractAbi): ContractAbi {
const contractAbi = _.cloneDeep(inputContractAbi);
const methodAbis = contractAbi.filter((abi: AbiDefinition) => abi.type === AbiType.Function) as MethodAbi[];
// Sort method Abis into alphabetical order, by function signature
const methodAbisOrdered = _.sortBy(methodAbis, [
(methodAbi: MethodAbi) => {
const functionSignature = abiUtils.getFunctionSignature(methodAbi);
return functionSignature;
},
]);
// Group method Abis by name (overloaded methods will be grouped together, in alphabetical order)
const methodAbisByName: { [key: string]: MethodAbi[] } = {};
_.each(methodAbisOrdered, methodAbi => {
(methodAbisByName[methodAbi.name] || (methodAbisByName[methodAbi.name] = [])).push(methodAbi);
});
// Rename overloaded methods to overloadedMethodName1, overloadedMethodName2, ...
_.each(methodAbisByName, methodAbisWithSameName => {
_.each(methodAbisWithSameName, (methodAbi, i: number) => {
if (methodAbisWithSameName.length > 1) {
const overloadedMethodId = i + 1;
const sanitizedMethodName = `${methodAbi.name}${overloadedMethodId}`;
const indexOfExistingAbiWithSanitizedMethodNameIfExists = _.findIndex(
methodAbis,
currentMethodAbi => currentMethodAbi.name === sanitizedMethodName,
);
if (indexOfExistingAbiWithSanitizedMethodNameIfExists >= 0) {
const methodName = methodAbi.name;
throw new Error(
`Failed to rename overloaded method '${methodName}' to '${sanitizedMethodName}'. A method with this name already exists.`,
);
}
methodAbi.name = sanitizedMethodName;
}
});
});
return contractAbi;
},
};
|
