Add lookup function to EtherscanVerifier

apps/contract-verification/src/app/Verifiers/EtherscanVerifier.ts

@@ -1,6 +1,6 @@
 import { CompilerAbstract } from '@remix-project/remix-solidity'
 import { AbstractVerifier } from './AbstractVerifier'
-import { SubmittedContract, VerificationResponse, VerificationStatus } from '../types/VerificationTypes'
+import { LookupResponse, SubmittedContract, VerificationResponse, VerificationStatus } from '../types/VerificationTypes'
 
 interface EtherscanVerificationRequest {
   chainId?: string
@@ -12,7 +12,7 @@ interface EtherscanVerificationRequest {
   constructorArguements?: string
 }
 
-interface EtherscanVerificationResponse {
+interface EtherscanRpcResponse {
   status: '0' | '1'
   message: string
   result: string
@@ -69,7 +69,7 @@ export class EtherscanVerifier extends AbstractVerifier {
       throw new Error(responseText)
     }
 
-    const verificationResponse: EtherscanVerificationResponse = await response.json()
+    const verificationResponse: EtherscanRpcResponse = await response.json()
 
     if (verificationResponse.status !== '1' || verificationResponse.message !== 'OK') {
       console.error('Error on Etherscan API verification at ' + this.apiUrl + '\nStatus: ' + verificationResponse.status + '\nMessage: ' + verificationResponse.message + '\nResult: ' + verificationResponse.result)
@@ -89,9 +89,7 @@ export class EtherscanVerifier extends AbstractVerifier {
       url.searchParams.append('apikey', this.apiKey)
     }
 
-    const response = await fetch(url.href, {
-      method: 'GET',
-    })
+    const response = await fetch(url.href, { method: 'GET' })
 
     if (!response.ok) {
       const responseText = await response.text()
@@ -125,13 +123,32 @@ export class EtherscanVerifier extends AbstractVerifier {
     return status
   }
 
-  async lookup(): Promise<any> {
-    // TODO type
-    // Implement the lookup logic here
-    console.log('Etherscan lookup started')
-    // Placeholder logic for lookup
-    const lookupResult = {} // Replace with actual lookup logic
-    console.log('Etherscan lookup completed')
-    return lookupResult
+  async lookup(contractAddress: string, chainId: string): Promise<LookupResponse> {
+    const url = new URL('api', this.apiUrl)
+    url.searchParams.append('module', 'contract')
+    url.searchParams.append('action', 'getabi')
+    url.searchParams.append('address', contractAddress)
+    if (this.apiKey) {
+      url.searchParams.append('apikey', this.apiKey)
+    }
+
+    const response = await fetch(url.href, { method: 'GET' })
+
+    if (!response.ok) {
+      const responseText = await response.text()
+      console.error('Error on Etherscan API lookup at ' + this.apiUrl + '\nStatus: ' + response.status + '\nResponse: ' + responseText)
+      throw new Error(responseText)
+    }
+
+    const lookupResponse: EtherscanRpcResponse = await response.json()
+
+    if (lookupResponse.result === 'Contract source code not verified') {
+      return { status: 'not verified' }
+    } else if (lookupResponse.status !== '1' || !lookupResponse.message.startsWith('OK')) {
+      console.error('Error on Etherscan API lookup at ' + this.apiUrl + '\nStatus: ' + lookupResponse.status + '\nMessage: ' + lookupResponse.message + '\nResult: ' + lookupResponse.result)
+      throw new Error(lookupResponse.result)
+    }
+
+    return { status: 'verified' }
   }
 }