From 2e850e668971a802d229d4675abb450e7a94393e Mon Sep 17 00:00:00 2001
From: Uxio Fuentefria <uxio@gnosis.pm>
Date: Mon, 21 Oct 2019 16:40:11 +0200
Subject: [PATCH] Support Safes with old proxy (payingProxy)

- Version of the Safe has to be at least v1.0.0
- Closes #213
---
 src/logic/contracts/safeContracts.js          | 25 +++++++++++++++++++
 .../load/components/DetailsForm/index.jsx     | 14 +++--------
 2 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/src/logic/contracts/safeContracts.js b/src/logic/contracts/safeContracts.js
index 30a005ed..9f8e039a 100644
--- a/src/logic/contracts/safeContracts.js
+++ b/src/logic/contracts/safeContracts.js
@@ -2,6 +2,7 @@
 import contract from 'truffle-contract'
 import ProxyFactorySol from '@gnosis.pm/safe-contracts/build/contracts/ProxyFactory.json'
 import GnosisSafeSol from '@gnosis.pm/safe-contracts/build/contracts/GnosisSafe.json'
+import SafeProxy from '@gnosis.pm/safe-contracts/build/contracts/Proxy.json'
 import { ensureOnce } from '~/utils/singleton'
 import { getWeb3 } from '~/logic/wallets/getWeb3'
 import { calculateGasOf, calculateGasPrice } from '~/logic/wallets/ethTransactions'
@@ -99,3 +100,27 @@ export const getGnosisSafeInstanceAt = async (safeAddress: string) => {
 
   return gnosisSafe
 }
+
+const cleanByteCodeMetadata = (bytecode: string): string => {
+  const metaData = 'a165'
+  return bytecode.substring(0, bytecode.lastIndexOf(metaData))
+}
+
+export const validateProxy = async (safeAddress: string): boolean => {
+  // https://solidity.readthedocs.io/en/latest/metadata.html#usage-for-source-code-verification
+  const web3 = getWeb3()
+  const code = await web3.eth.getCode(safeAddress)
+  const codeWithoutMetadata = cleanByteCodeMetadata(code)
+  const supportedProxies = [SafeProxy]
+  for (let i = 0; i < supportedProxies.length; i += 1) {
+    const proxy = supportedProxies[i]
+    const proxyCode = proxy.deployedBytecode
+    const proxyCodeWithoutMetadata = cleanByteCodeMetadata(proxyCode)
+    if (codeWithoutMetadata === proxyCodeWithoutMetadata) {
+      return true
+    }
+  }
+  // Old PayingProxyCode
+  const oldProxyCode = '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'
+  return codeWithoutMetadata === oldProxyCode
+}
diff --git a/src/routes/load/components/DetailsForm/index.jsx b/src/routes/load/components/DetailsForm/index.jsx
index da0f8fd3..8c0d2374 100644
--- a/src/routes/load/components/DetailsForm/index.jsx
+++ b/src/routes/load/components/DetailsForm/index.jsx
@@ -1,7 +1,6 @@
 // @flow
 import * as React from 'react'
 import { withStyles } from '@material-ui/core/styles'
-import SafeProxy from '@gnosis.pm/safe-contracts/build/contracts/Proxy.json'
 import InputAdornment from '@material-ui/core/InputAdornment'
 import CheckCircle from '@material-ui/icons/CheckCircle'
 import Field from '~/components/forms/Field'
@@ -15,7 +14,7 @@ import Paragraph from '~/components/layout/Paragraph'
 import OpenPaper from '~/components/Stepper/OpenPaper'
 import { FIELD_LOAD_NAME, FIELD_LOAD_ADDRESS } from '~/routes/load/components/fields'
 import { getWeb3 } from '~/logic/wallets/getWeb3'
-import { getSafeMasterContract } from '~/logic/contracts/safeContracts'
+import { getSafeMasterContract, validateProxy } from '~/logic/contracts/safeContracts'
 import { secondary } from '~/theme/variables'
 
 type Props = {
@@ -56,15 +55,8 @@ export const safeFieldsValidation = async (values: Object) => {
     return errors
   }
 
-  // https://solidity.readthedocs.io/en/latest/metadata.html#usage-for-source-code-verification
-  const metaData = 'a165'
-
-  const code = await web3.eth.getCode(safeAddress)
-  const codeWithoutMetadata = code.substring(0, code.lastIndexOf(metaData))
-  const proxyCode = SafeProxy.deployedBytecode
-  const proxyCodeWithoutMetadata = proxyCode.substring(0, proxyCode.lastIndexOf(metaData))
-  const safeInstance = codeWithoutMetadata === proxyCodeWithoutMetadata
-  if (!safeInstance) {
+  const isValidProxy = await validateProxy(safeAddress)
+  if (!isValidProxy) {
     errors[FIELD_LOAD_ADDRESS] = SAFE_INSTANCE_ERROR
     return errors
   }