depreciate e712 w/ provider signing

lib/Permit.js

@@ -1,6 +1,6 @@
-const { EIP712Signer } = require('@ticket721/e712')
+import { concatSig } from 'eth-sig-util'
 
-const Permit = [
+const PermitType = [
   { name: 'owner', type: 'address' },
   { name: 'spender', type: 'address' },
   { name: 'value', type: 'uint256' },
@@ -8,36 +8,53 @@ const Permit = [
   { name: 'deadline', type: 'uint256' }
 ]
 
-class PermitSigner extends EIP712Signer {
+const EIP712DomainType = [
+  { name: 'name', type: 'string' },
+  { name: 'version', type: 'string' },
+  { name: 'chainId', type: 'uint256' },
+  { name: 'verifyingContract', type: 'address' }
+]
+
+export default class PermitSigner {
   constructor(_domain, _permitArgs) {
-    super(_domain, ['Permit', Permit])
     this.permitArgs = _permitArgs
+    this.domain = _domain
   }
 
-  // Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)
   setPermitInfo(_permitArgs) {
     this.permitArgs = _permitArgs
   }
 
-  getPayload() {
-    return this.generatePayload(this.permitArgs, 'Permit')
-  }
-
-  async getSignature(privateKey) {
-    const payload = this.getPayload()
-    const { hex, v, r, s } = await this.sign(privateKey, payload)
+  getReqPayload() {
     return {
-      hex,
-      v,
-      r: '0x' + r,
-      s: '0x' + s
+      domain: this.domain,
+      primaryType: 'Permit',
+      types: {
+        Permit: PermitType,
+        EIP712Domain: EIP712DomainType
+      },
+      message: this.permitArgs
     }
   }
 
-  getSignerAddress(permitArgs, signature) {
-    const originalPayload = this.generatePayload(permitArgs, 'Permit')
-    return this.verify(originalPayload, signature)
+  getSignature(response) {
+    response = response.substring(2)
+
+    const r = '0x' + response.substring(0, 64)
+    const s = '0x' + response.substring(64, 128)
+
+    let v = parseInt(response.substring(128, 130), 16)
+
+    // fix ledger sign
+    if (v === 0 || v === 1) {
+      v = v + 27
+    }
+
+    return {
+      hex: concatSig(v, r, s),
+      v,
+      r,
+      s
+    }
   }
 }
-
-module.exports = { PermitSigner }