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add interface cmd to hardhat #277

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add interface cmd to hardhat #277

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1 change: 1 addition & 0 deletions hardhat.config.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ const exec = promisify(_exec)
// hardhat actions
import './tasks/accounts'
import './tasks/archive_scan'
import './tasks/interface'
import './tasks/save'
import './tasks/seed'

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17 changes: 17 additions & 0 deletions tasks/interface.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
import { Interface } from 'ethers/lib/utils'
import { task } from 'hardhat/config'

const { makeInterfaceId } = require('@openzeppelin/test-helpers')

function computeInterfaceId(iface: Interface) {
return makeInterfaceId.ERC165(
Object.values(iface.functions).map((frag) => frag.format('sighash')),
)
}

task('interface', 'Prints the EIP165 interface ID of a contract')
.addPositionalParam('contract', 'The contract to print the interface ID of')
.setAction(async ({ contract }, hre) => {
const artifact = await hre.artifacts.readArtifact(contract)
console.log(computeInterfaceId(new Interface(artifact.abi)))
})
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