Resolve issue where Dates passed as input that contain a microsecond portion would cause API exceptions

Author: alexanderjordanbaker

Sources/AppStoreServerLibrary/Utility.swift

@@ -19,7 +19,11 @@ internal func getJsonDecoder() -> JSONDecoder  {
 }
 
 internal func getJsonEncoder() -> JSONEncoder  {
-    let decoder = JSONEncoder()
-    decoder.dateEncodingStrategy = .millisecondsSince1970
-    return decoder
+    let encoder = JSONEncoder()
+    encoder.dateEncodingStrategy = .custom({ date, e in
+        // To encode the same as millisecondsSince1970, however truncating the decimal part
+        var container = e.singleValueContainer()
+        try container.encode((date.timeIntervalSince1970 * 1000.0).rounded(.towardZero))
+    })
+    return encoder
 }

Tests/AppStoreServerLibraryTests/AppStoreServerAPIClientTests.swift

@@ -246,6 +246,25 @@ final class AppStoreServerAPIClientTests: XCTestCase {
         TestingUtility.confirmCodableInternallyConsistent(notificationHistoryResponse)
     }
 
+    public func testGetNotificationHistoryWithMicrosecondValues() async throws {
+        let client = try getClientWithBody("resources/models/getNotificationHistoryResponse.json") { request, body in
+            let decodedJson = try! JSONSerialization.jsonObject(with: body!) as! [String: Any]
+            XCTAssertEqual(1698148900000, decodedJson["startDate"] as! Int)
+            XCTAssertEqual(1698148950000, decodedJson["endDate"] as! Int)
+        }
+
+        let notificationHistoryRequest = NotificationHistoryRequest(
+            startDate: Date(timeIntervalSince1970: 1698148900).advanced(by: 0.000_9), // 900 microseconds
+            endDate: Date(timeIntervalSince1970: 1698148950).advanced(by: 0.000_001), // 1 microsecond
+            notificationType: NotificationTypeV2.subscribed,
+            notificationSubtype: Subtype.initialBuy,
+            transactionId: "999733843",
+            onlyFailures: true
+        )
+
+        let _ = await client.getNotificationHistory(paginationToken: "a036bc0e-52b8-4bee-82fc-8c24cb6715d6", notificationHistoryRequest: notificationHistoryRequest)
+    }
+    
     public func testGetTransactionHistoryV1() async throws {
         let client = try getClientWithBody("resources/models/transactionHistoryResponse.json") { request, body in
             XCTAssertEqual(.GET, request.method)

Tests/AppStoreServerLibraryTests/XcodeSignedDataVerifierTests.swift

@@ -30,7 +30,7 @@ final class XcodeSignedDataVerifierTests: XCTestCase {
         XCTAssertNil(appTransaction.preorderDate)
         XCTAssertEqual(.xcode, appTransaction.receiptType)
         XCTAssertEqual("Xcode", appTransaction.rawReceiptType)
-        TestingUtility.confirmCodableInternallyConsistent(appTransaction)
+        confirmCodableInternallyConsistentForXcode(appTransaction)
     }
 
     public func testXcodeSignedTransaction() async throws {
@@ -72,7 +72,7 @@ final class XcodeSignedDataVerifierTests: XCTestCase {
         XCTAssertEqual("143441", transaction.storefrontId)
         XCTAssertEqual(TransactionReason.purchase, transaction.transactionReason)
         XCTAssertEqual("PURCHASE", transaction.rawTransactionReason)
-        TestingUtility.confirmCodableInternallyConsistent(transaction)
+        confirmCodableInternallyConsistentForXcode(transaction)
     }
 
     public func testXcodeSignedRenewalInfo() async throws {
@@ -102,7 +102,7 @@ final class XcodeSignedDataVerifierTests: XCTestCase {
         XCTAssertEqual("Xcode", renewalInfo.rawEnvironment)
         compareXcodeDates(Date(timeIntervalSince1970: 1697679936.049), renewalInfo.recentSubscriptionStartDate)
         compareXcodeDates(Date(timeIntervalSince1970: 1700358336.049), renewalInfo.renewalDate)
-        TestingUtility.confirmCodableInternallyConsistent(renewalInfo)
+        confirmCodableInternallyConsistentForXcode(renewalInfo)
     }
 
     public func testXcodeSignedAppTransactionWithProductionEnvironment() async throws {
@@ -122,4 +122,13 @@ final class XcodeSignedDataVerifierTests: XCTestCase {
     private func compareXcodeDates(_ first: Date, _ second: Date?) {
         XCTAssertEqual(floor((first.timeIntervalSince1970 * 1000)), floor(((second?.timeIntervalSince1970 ?? 0.0) * 1000)))
     }
+    
+    private func confirmCodableInternallyConsistentForXcode<T>(_ codable: T) where T : Codable, T : Equatable {
+        let type = type(of: codable)
+        let encoder = JSONEncoder()
+        // Xcode receipts contain a decimal value, we encode the value as encoded in those receipts
+        encoder.dateEncodingStrategy = .millisecondsSince1970
+        let parsedValue = try! getJsonDecoder().decode(type, from: encoder.encode(codable))
+        XCTAssertEqual(parsedValue, codable)
+    }
 }