bugfix: estimateUserOperationGas gas values are overridden by the default values (#119)

default values are for missing values, and should not override user-specified values.
(reported by: https://t.me/sherifabdelmoatty)

* update node version

.github/workflows/build.yml

@@ -19,7 +19,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: '14'
+          node-version: '18'
       - uses: actions/checkout@v1
       - uses: actions/cache@v2
         with:
@@ -33,7 +33,7 @@ jobs:
     steps:
       - uses: actions/setup-node@v1
         with:
-          node-version: '14'
+          node-version: '18'
       - uses: actions/checkout@v1
       - uses: actions/cache@v2
         with:

packages/bundler/localconfig/bundler.config.json

@@ -1,7 +1,7 @@
 {
   "gasFactor": "1",
   "port": "3000",
-  "network": "http://localhost:8545",
+  "network": "http://127.0.0.1:8545",
   "entryPoint": "0x5FF137D4b0FDCD49DcA30c7CF57E578a026d2789",
   "beneficiary": "0xd21934eD8eAf27a67f0A70042Af50A1D6d195E81",
   "minBalance": "1",

packages/bundler/src/UserOpMethodHandler.ts

@@ -94,18 +94,18 @@ export class UserOpMethodHandler {
 
   /**
    * eth_estimateUserOperationGas RPC api.
-   * @param userOp1
+   * @param userOp1 input userOp (may have gas fields missing, so they can be estimated)
    * @param entryPointInput
    */
   async estimateUserOperationGas (userOp1: UserOperationStruct, entryPointInput: string): Promise<EstimateUserOpGasResult> {
     const userOp = {
-      ...await resolveProperties(userOp1),
       // default values for missing fields.
       paymasterAndData: '0x',
       maxFeePerGas: 0,
       maxPriorityFeePerGas: 0,
       preVerificationGas: 0,
-      verificationGasLimit: 10e6
+      verificationGasLimit: 10e6,
+      ...await resolveProperties(userOp1) as any
     }
 
     // todo: checks the existence of parameters, but since we hexlify the inputs, it fails to validate

packages/bundler/test/UserOpMethodHandler.test.ts

@@ -111,11 +111,19 @@ describe('UserOpMethodHandler', function () {
       })
     })
     it('estimateUserOperationGas should estimate even without eth', async () => {
+      // fail without gas
       const op = await smartAccountAPI.createSignedUserOp({
         target,
         data: '0xdeadface'
       })
-      const ret = await methodHandler.estimateUserOperationGas(await resolveHexlify(op), entryPoint.address)
+      expect(await methodHandler.estimateUserOperationGas(await resolveHexlify(op), entryPoint.address).catch(e => e.message)).to.eql('AA21 didn\'t pay prefund')
+      // should estimate with gasprice=0
+      const op1 = await smartAccountAPI.createSignedUserOp({
+        maxFeePerGas: 0,
+        target,
+        data: '0xdeadface'
+      })
+      const ret = await methodHandler.estimateUserOperationGas(await resolveHexlify(op1), entryPoint.address)
       // verification gas should be high - it creates this wallet
       expect(ret.verificationGasLimit).to.be.closeTo(300000, 100000)
       // execution should be quite low.