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Decode NULL as false

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This commit is contained in:
Greg Hysen
2019-02-04 16:25:00 -08:00
parent 74293d5bc8
commit db900d180c
3 changed files with 29 additions and 1 deletions
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9
packages/utils/CHANGELOG.json
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@@ -1,4 +1,13 @@
[
{
"version": "4.0.1",
"changes": [
{
"note": "ABI Decode NULL as False"
"pr": 1582
}
]
},
{
"version": "4.0.0",
"changes": [

3
packages/utils/src/abi_encoder/evm_data_types/bool.ts
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@@ -36,7 +36,8 @@ export class BoolDataType extends AbstractBlobDataType {
public decodeValue(calldata: RawCalldata): boolean {
const valueBuf = calldata.popWord();
const valueHex = ethUtil.bufferToHex(valueBuf);
const valueNumber = new BigNumber(valueHex, constants.HEX_BASE);
// Hack @hysz: there are some cases where `false` is encoded as 0x instead of 0x0.
const valueNumber = valueHex === '0x' ? new BigNumber(0) : new BigNumber(valueHex, constants.HEX_BASE);
if (!(valueNumber.isEqualTo(0) || valueNumber.isEqualTo(1))) {
throw new Error(`Failed to decode boolean. Expected 0x0 or 0x1, got ${valueHex}`);
}

18
packages/utils/test/abi_encoder/evm_data_types_test.ts
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@@ -489,6 +489,24 @@ describe('ABI Encoder: EVM Data Type Encoding/Decoding', () => {
const argsEncodedFromSignature = dataTypeFromSignature.encode(args);
expect(argsEncodedFromSignature).to.be.deep.equal(expectedEncodedArgs);
});
it('Null should decode as False', async () => {
// Hack @hysz: there are some cases where `false` is encoded as 0x instead of 0x0.
// Create DataType object
const testDataItem = { name: 'Boolean', type: 'bool' };
const dataType = new AbiEncoder.Bool(testDataItem);
// Construct args to be encoded
const args = false;
// Encode Args and validate result
const encodedArgs = '0x';
const expectedEncodedArgs = '0x0000000000000000000000000000000000000000000000000000000000000000';
// Decode Encoded Args and validate result
const decodedArgs = dataType.decode(encodedArgs);
expect(decodedArgs).to.be.deep.equal(args);
// Validate signature
const dataTypeFromSignature = AbiEncoder.create(dataType.getSignature(true));
const argsEncodedFromSignature = dataTypeFromSignature.encode(args);
expect(argsEncodedFromSignature).to.be.deep.equal(expectedEncodedArgs);
});
});
describe('Integer', () => {