added EtherscanTransactionChecker

Author: albertopeam

Sources/Web3Core/KeystoreManager/EtherscanTransactionChecker.swift

@@ -0,0 +1,49 @@
+//
+//  EtherscanTransactionChecker.swift
+//  Created by albertopeam on 28/12/22.
+//
+
+import Foundation
+import _Concurrency
+
+public struct EtherscanTransactionChecker: TransactionChecker {
+    private let urlSession: URLSessionProxy
+    private let apiKey: String
+    
+    public init(urlSession: URLSessionProxy, apiKey: String) {
+        self.urlSession = urlSession
+        self.apiKey = apiKey
+    }
+    
+    public func hasTransactions(address: String) async throws -> Bool {
+        let urlString = "https://api.etherscan.io/api?module=account&action=txlist&address=\(address)&startblock=0&page=1&offset=1&sort=asc&apikey=\(apiKey)"
+        guard let url = URL(string: urlString) else {
+            throw EtherscanTransactionCheckerError.invalidUrl
+        }
+        let request = URLRequest(url: url)
+        let result = try await urlSession.data(request: request)
+        let response = try JSONDecoder().decode(Response.self, from: result.0)
+        return !response.result.isEmpty
+    }
+}
+
+extension EtherscanTransactionChecker {
+    struct Response: Codable {
+        let result: [Transaction]
+    }
+    struct Transaction: Codable {}
+}
+
+public enum EtherscanTransactionCheckerError: Error {
+    case invalidUrl
+}
+
+public protocol URLSessionProxy {
+    func data(request: URLRequest) async throws -> (Data, HTTPURLResponse)
+}
+
+extension URLSession: URLSessionProxy {
+    public func data(request: URLRequest) async throws -> (Data, HTTPURLResponse) {
+        return try await data(for: request)
+    }
+}

Tests/web3swiftTests/localTests/BIP44Tests.swift

@@ -7,7 +7,7 @@ import XCTest
 import Web3Core
 @testable import web3swift
 
-final class BIP44Tests: LocalTestCase {
+final class BIP44Tests: XCTestCase {
     private var accountZeroScannedAddresses: [String]!
     private var accountZeroAndOneScannedAddresses: [String]!
     private var mockTransactionChecker: MockTransactionChecker!

Tests/web3swiftTests/remoteTests/EtherscanTransactionCheckerTests.swift

@@ -0,0 +1,77 @@
+//
+//  EtherscanTransactionCheckerTests.swift
+//  Created by albertopeam on 28/12/22.
+//
+
+import XCTest
+@testable import Web3Core
+
+final class EtherscanTransactionCheckerTests: XCTestCase {
+    private var testApiKey: String!
+    private var vitaliksAddress: String!
+    private var emptyAddress: String!
+    
+    override func setUpWithError() throws {
+        try super.setUpWithError()
+        testApiKey = "4HVPVMV1PN6NGZDFXZIYKEZRP53IA41KVC"
+        vitaliksAddress = "0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B"
+        emptyAddress = "0x1BeY3KhtHpfATH5Yqxz9d8Z1XbqZFSXtK7"
+    }
+    
+    override func tearDownWithError() throws {
+        try super.tearDownWithError()
+        testApiKey = nil
+        vitaliksAddress = nil
+        emptyAddress = nil
+    }
+
+    func testHasTransactions() async throws {
+        let sut = EtherscanTransactionChecker(urlSession: URLSession.shared, apiKey: testApiKey)
+        
+        let result = try await sut.hasTransactions(address: vitaliksAddress)
+        
+        XCTAssertTrue(result)
+    }
+    
+    func testHasNotTransactions() async throws {
+        let sut = EtherscanTransactionChecker(urlSession: URLSession.shared, apiKey: testApiKey)
+        
+        let result = try await sut.hasTransactions(address: emptyAddress)
+        
+        XCTAssertFalse(result)
+    }
+    
+    func testNetworkError() async throws {
+        do {
+            let urlSessionMock = URLSessionMock()
+            urlSessionMock.response = (Data(), try XCTUnwrap(HTTPURLResponse(url: try XCTUnwrap(URL(string: "https://")), statusCode: 500, httpVersion: nil, headerFields: nil)))
+            let sut = EtherscanTransactionChecker(urlSession: urlSessionMock, apiKey: testApiKey)
+            
+            _ = try await sut.hasTransactions(address: vitaliksAddress)
+            
+            XCTFail()
+        } catch {
+            XCTAssertTrue(true)
+        }
+    }
+    
+    func testWrongApiKey() async throws {
+        do {
+            let sut = EtherscanTransactionChecker(urlSession: URLSession.shared, apiKey: "")
+            
+            _ = try await sut.hasTransactions(address: "")
+            
+            XCTFail()
+        } catch DecodingError.typeMismatch {
+            XCTAssertTrue(true)
+        }
+    }
+}
+
+final class URLSessionMock: URLSessionProxy {
+    var response: (Data, HTTPURLResponse) = (Data(), HTTPURLResponse())
+    
+    func data(request: URLRequest) async throws -> (Data, HTTPURLResponse) {
+        return response
+    }
+}