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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /* Sourced from 0x.js */ | ||
|
|
||
| import { assert as sharedAssert } from "@0x/assert"; | ||
| // We need those two unused imports because they're actually used by sharedAssert which gets injected here | ||
| // eslint-disable-next-line @typescript-eslint/no-unused-vars | ||
| import { schemas } from "@0x/json-schemas"; | ||
| // eslint-disable-next-line @typescript-eslint/no-unused-vars | ||
| import { BigNumber } from "@0x/utils"; | ||
| import { Web3Wrapper } from "@0x/web3-wrapper"; | ||
| import * as ethUtil from "ethereumjs-util"; | ||
| import * as _ from "lodash"; | ||
| import { ECSignature } from "../types"; | ||
|
|
||
| /* Sourced from: https://github.com/ProjectOpenSea/wyvern-js/blob/master/src/utils/assert.ts */ | ||
| export const assert = { | ||
| ...sharedAssert, | ||
| isValidSignature( | ||
| orderHash: string, | ||
| ecSignature: ECSignature, | ||
| signerAddress: string | ||
| ) { | ||
| const isValidSignature = signatureUtils.isValidSignature( | ||
| orderHash, | ||
| ecSignature, | ||
| signerAddress | ||
| ); | ||
| this.assert( | ||
| isValidSignature, | ||
| `Expected order with hash '${orderHash}' to have a valid signature` | ||
| ); | ||
| }, | ||
| async isSenderAddressAsync( | ||
| variableName: string, | ||
| senderAddressHex: string, | ||
| web3Wrapper: Web3Wrapper | ||
| ): Promise<void> { | ||
| sharedAssert.isETHAddressHex(variableName, senderAddressHex); | ||
| const isSenderAddressAvailable = | ||
| await web3Wrapper.isSenderAddressAvailableAsync(senderAddressHex); | ||
| sharedAssert.assert( | ||
| isSenderAddressAvailable, | ||
| `Specified ${variableName} ${senderAddressHex} isn't available through the supplied web3 provider` | ||
| ); | ||
| }, | ||
| async isUserAddressAvailableAsync(web3Wrapper: Web3Wrapper): Promise<void> { | ||
| const availableAddresses = await web3Wrapper.getAvailableAddressesAsync(); | ||
| this.assert( | ||
| !_.isEmpty(availableAddresses), | ||
| "No addresses were available on the provided web3 provider" | ||
| ); | ||
| }, | ||
| }; | ||
|
|
||
| /* Sourced from https://github.com/ProjectOpenSea/wyvern-js/blob/master/src/utils/signature_utils.ts */ | ||
| const signatureUtils = { | ||
| isValidSignature( | ||
| data: string, | ||
| signature: ECSignature, | ||
| signerAddress: string | ||
| ): boolean { | ||
| const dataBuff = ethUtil.toBuffer(data); | ||
| // const msgHashBuff = ethUtil.hashPersonalMessage(dataBuff); | ||
| const msgHashBuff = dataBuff; | ||
| try { | ||
| const pubKey = ethUtil.ecrecover( | ||
| msgHashBuff, | ||
| signature.v, | ||
| ethUtil.toBuffer(signature.r), | ||
| ethUtil.toBuffer(signature.s) | ||
| ); | ||
| const retrievedAddress = ethUtil.bufferToHex( | ||
| ethUtil.pubToAddress(pubKey) | ||
| ); | ||
| return retrievedAddress === signerAddress; | ||
| } catch (err) { | ||
| return false; | ||
| } | ||
| }, | ||
| parseSignatureHexAsVRS(signatureHex: string): ECSignature { | ||
| const signatureBuffer = ethUtil.toBuffer(signatureHex); | ||
| let v = +ethUtil.bufferToHex(signatureBuffer.slice(0, 1)); | ||
| if (v < 27) { | ||
| v += 27; | ||
| } | ||
| const r = signatureBuffer.slice(1, 33); | ||
| const s = signatureBuffer.slice(33, 65); | ||
| const ecSignature: ECSignature = { | ||
| v, | ||
| r: ethUtil.bufferToHex(r), | ||
| s: ethUtil.bufferToHex(s), | ||
| }; | ||
| return ecSignature; | ||
| }, | ||
| parseSignatureHexAsRSV(signatureHex: string): ECSignature { | ||
| const { v, r, s } = ethUtil.fromRpcSig(signatureHex); | ||
| const ecSignature: ECSignature = { | ||
| v, | ||
| r: ethUtil.bufferToHex(r), | ||
| s: ethUtil.bufferToHex(s), | ||
| }; | ||
| return ecSignature; | ||
| }, | ||
| }; |
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