45 lines
1.1 KiB
JavaScript
45 lines
1.1 KiB
JavaScript
const { EIP712Signer } = require('@ticket721/e712')
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const Permit = [
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{ name: 'owner', type: 'address' },
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{ name: 'spender', type: 'address' },
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{ name: 'value', type: 'uint256' },
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{ name: 'nonce', type: 'uint256' },
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{ name: 'deadline', type: 'uint256' },
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]
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class PermitSigner extends EIP712Signer {
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constructor(_domain, _permitArgs) {
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super(_domain, ['Permit', Permit])
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this.permitArgs = _permitArgs
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}
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// Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)
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setPermitInfo(_permitArgs) {
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this.permitArgs = _permitArgs
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}
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getPayload() {
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return this.generatePayload(this.permitArgs, 'Permit')
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}
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async getSignature(privateKey) {
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let payload = this.getPayload()
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payload.message.owner = payload.message.owner.address
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const { hex, v, r, s } = await this.sign(privateKey, payload)
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return {
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hex,
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v,
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r: '0x' + r,
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s: '0x' + s,
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}
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}
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getSignerAddress(permitArgs, signature) {
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const original_payload = this.generatePayload(permitArgs, 'Permit')
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return this.verify(original_payload, signature)
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}
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}
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module.exports = { PermitSigner }
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