3e82db2f6f
* Now compiling using truffle 5.
* Migrated some test files, missing BN scientific notation usage.
* Now using BN time values.
* Migrate ERC20 tests.
* Migrate all ERC20 tests.
* Migrate utils, payment and ownership tests.
* All tests save ERC721 migrated.
* Migrated ERC721 tests.
* Fix lint errors.
* Delete old test helpers.
* Fix remaining crowdsale tests.
* Fix signature bouncer tests.
* Update how constants is used.
* Compile script pre-removes the build dir.
* Fix SafeMath tests.
* Revert "Compile script pre-removes the build dir."
This reverts commit 247e745113.
* Fix linter errors.
* Upgrade openzeppelin-test-helpers dependency.
* Update openzeppelin-test-helpers dependency.
* Define math constants globally.
* Remove unnecessary ether unit.
* Roll back reduced ether amounts in tests.
* Remove unnecessary toNumber conversions.
* Delete compile script.
* Fixed failing test.
55 lines
1.8 KiB
JavaScript
55 lines
1.8 KiB
JavaScript
const REAL_SIGNATURE_SIZE = 2 * 65; // 65 bytes in hexadecimal string legnth
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const PADDED_SIGNATURE_SIZE = 2 * 96; // 96 bytes in hexadecimal string length
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const DUMMY_SIGNATURE = `0x${web3.utils.padLeft('', REAL_SIGNATURE_SIZE)}`;
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function toEthSignedMessageHash (messageHex) {
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const messageBuffer = Buffer.from(messageHex.substring(2), 'hex');
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const prefix = Buffer.from(`\u0019Ethereum Signed Message:\n${messageBuffer.length}`);
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return web3.utils.sha3(Buffer.concat([prefix, messageBuffer]));
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}
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// signs message in node (ganache auto-applies "Ethereum Signed Message" prefix)
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const signMessage = (signer, messageHex = '0x') => {
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return web3.eth.sign(messageHex, signer);
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};
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/**
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* Create a signer between a contract and a signer for a voucher of method, args, and redeemer
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* Note that `method` is the web3 method, not the truffle-contract method
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* @param contract TruffleContract
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* @param signer address
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* @param redeemer address
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* @param methodName string
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* @param methodArgs any[]
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*/
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const getSignFor = (contract, signer) => (redeemer, methodName, methodArgs = []) => {
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const parts = [
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contract.address,
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redeemer,
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];
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// if we have a method, add it to the parts that we're signing
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if (methodName) {
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if (methodArgs.length > 0) {
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parts.push(
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contract.contract.methods[methodName](...methodArgs.concat([DUMMY_SIGNATURE])).encodeABI()
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.slice(0, -1 * PADDED_SIGNATURE_SIZE)
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);
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} else {
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const abi = contract.abi.find(abi => abi.name === methodName);
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parts.push(abi.signature);
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}
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}
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// return the signature of the "Ethereum Signed Message" hash of the hash of `parts`
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const messageHex = web3.utils.soliditySha3(...parts);
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return signMessage(signer, messageHex);
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};
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module.exports = {
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signMessage,
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toEthSignedMessageHash,
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getSignFor,
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};
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