fix: code style

src/main/java/com/apple/itunes/storekit/client/AppStoreServerAPIClient.java

@@ -22,7 +22,6 @@
 import com.apple.itunes.storekit.model.TransactionHistoryRequest;
 import com.apple.itunes.storekit.model.TransactionInfoResponse;
 import com.fasterxml.jackson.annotation.JsonAutoDetect;
-import com.fasterxml.jackson.core.JsonParseException;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import okhttp3.Call;
@@ -39,6 +38,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 public class AppStoreServerAPIClient {
@@ -79,7 +79,7 @@ private Response makeRequest(String path, String method, Map<String, List<String
         requestBuilder.addHeader("User-Agent", USER_AGENT);
         requestBuilder.addHeader("Authorization", "Bearer " + bearerTokenAuthenticator.generateToken());
         requestBuilder.addHeader("Accept", "application/json");
-        HttpUrl.Builder urlBuilder = urlBase.resolve(path).newBuilder();
+        HttpUrl.Builder urlBuilder = Objects.requireNonNull(urlBase.resolve(path)).newBuilder();
         for (Map.Entry<String, List<String>> entry : queryParameters.entrySet()) {
             for (String queryValue : entry.getValue()) {
                 urlBuilder.addQueryParameter(entry.getKey(), queryValue);

src/main/java/com/apple/itunes/storekit/client/BearerTokenAuthenticator.java

@@ -14,7 +14,6 @@
 import java.time.temporal.ChronoUnit;
 import java.util.Base64;
 import java.util.Map;
-import java.util.stream.Collectors;
 
 public class BearerTokenAuthenticator {
     private static final String APP_STORE_CONNECT_AUDIENCE = "appstoreconnect-v1";

src/main/java/com/apple/itunes/storekit/model/AppTransaction.java

@@ -12,7 +12,6 @@
  Information that represents the customer’s purchase of the app, cryptographically signed by the App Store.
 
  @see <a href="https://developer.apple.com/documentation/storekit/apptransaction">AppTransaction</a>
-
  */
 public class AppTransaction implements DecodedSignedData {
 
@@ -253,7 +252,6 @@ public AppTransaction deviceVerificationNonce(UUID deviceVerificationNonce) {
 
      @see <a href="https://developer.apple.com/documentation/storekit/apptransaction/4013175-preorderdate">preorderDate</a>
      */
-
     public Long getPreorderDate() {
         return preorderDate;
     }

src/test/java/com/apple/itunes/storekit/client/AppStoreServerAPIClientTest.java

@@ -78,7 +78,7 @@ public void testExtendRenewalDateForAllActiveSubscribers() throws IOException, A
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }
-            Map<String, Object> root = null;
+            Map<String, Object> root;
             try {
                 root = new ObjectMapper().readValue(buffer.readUtf8(), Map.class);
             } catch (JsonProcessingException e) {
@@ -118,7 +118,7 @@ public void testExtendSubscriptionRenewalDate() throws IOException, APIException
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }
-            Map<String, Object> root = null;
+            Map<String, Object> root;
             try {
                 root = new ObjectMapper().readValue(buffer.readUtf8(), Map.class);
             } catch (JsonProcessingException e) {
@@ -259,7 +259,7 @@ public void testGetNotificationHistory() throws APIException, IOException {
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }
-            Map<String, Object> root = null;
+            Map<String, Object> root;
             try {
                 root = new ObjectMapper().readValue(buffer.readUtf8(), Map.class);
             } catch (JsonProcessingException e) {
@@ -412,7 +412,7 @@ public void testSendConsumptionData() throws APIException, IOException {
             } catch (IOException e) {
                 throw new RuntimeException(e);
             }
-            Map<String, Object> root = null;
+            Map<String, Object> root;
             try {
                 root = new ObjectMapper().readValue(buffer.readUtf8(), Map.class);
             } catch (JsonProcessingException e) {
@@ -573,6 +573,7 @@ private AppStoreServerAPIClient getAppStoreServerAPIClient(String body, Consumer
 
     private AppStoreServerAPIClient getAppStoreServerAPIClient(String body, Consumer<Request> requestVerifier, int statusCode) throws IOException {
         try (InputStream key = this.getClass().getClassLoader().getResourceAsStream("certs/testSigningKey.p8")) {
+            Assertions.assertNotNull(key);
             return new AppStoreServerAPIClient(new String(key.readAllBytes()), "keyId", "issuerId", "com.example", Environment.LOCAL_TESTING) {
                 @Override
                 protected Response getResponse(Request request) {

src/test/java/com/apple/itunes/storekit/client/BearerTokenAuthenticatorTest.java

@@ -12,6 +12,7 @@ class BearerTokenAuthenticatorTest {
     @Test
     void testCreatingToken() throws Exception {
         try (InputStream key = this.getClass().getClassLoader().getResourceAsStream("certs/testSigningKey.p8")) {
+            Assertions.assertNotNull(key);
             var tokenGenerator = new BearerTokenAuthenticator(new String(key.readAllBytes()), "keyId", "issuerId", "bundleId");
             String token = tokenGenerator.generateToken();
             Assertions.assertNotNull(token);

src/test/java/com/apple/itunes/storekit/model/JWSRenewalInfoDecodedPayloadTest.java

@@ -10,12 +10,11 @@
 
 import java.io.IOException;
 import java.security.NoSuchAlgorithmException;
-import java.security.spec.InvalidKeySpecException;
 
 public class JWSRenewalInfoDecodedPayloadTest {
 
     @Test
-    public void testRenewalInfoDecoding() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException, VerificationException {
+    public void testRenewalInfoDecoding() throws IOException, NoSuchAlgorithmException, VerificationException {
         String signedRenewalInfo = SignedDataCreator.createSignedDataFromJson("models/signedRenewalInfo.json");
 
         JWSRenewalInfoDecodedPayload renewalInfo = TestingUtility.getSignedPayloadVerifier().verifyAndDecodeRenewalInfo(signedRenewalInfo);

src/test/java/com/apple/itunes/storekit/model/JWSTransactionDecodedPayloadTest.java

@@ -10,13 +10,12 @@
 
 import java.io.IOException;
 import java.security.NoSuchAlgorithmException;
-import java.security.spec.InvalidKeySpecException;
 import java.util.UUID;
 
 public class JWSTransactionDecodedPayloadTest {
 
     @Test
-    public void testTransactionDecoding() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException, VerificationException {
+    public void testTransactionDecoding() throws IOException, NoSuchAlgorithmException, VerificationException {
         String signedTransaction = SignedDataCreator.createSignedDataFromJson("models/signedTransaction.json");
 
         JWSTransactionDecodedPayload transaction = TestingUtility.getSignedPayloadVerifier().verifyAndDecodeTransaction(signedTransaction);

src/test/java/com/apple/itunes/storekit/model/ResponseBodyV2DecodedPayloadTest.java

@@ -12,14 +12,13 @@
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.security.NoSuchAlgorithmException;
-import java.security.spec.InvalidKeySpecException;
 import java.util.List;
 import java.util.Set;
 
 public class ResponseBodyV2DecodedPayloadTest {
 
     @Test
-    public void testNotificationDecoding() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException, VerificationException {
+    public void testNotificationDecoding() throws IOException, NoSuchAlgorithmException, VerificationException {
         String signedNotification = SignedDataCreator.createSignedDataFromJson("models/signedNotification.json");
 
         ResponseBodyV2DecodedPayload notification = TestingUtility.getSignedPayloadVerifier().verifyAndDecodeNotification(signedNotification);
@@ -46,7 +45,7 @@ public void testNotificationDecoding() throws IOException, NoSuchAlgorithmExcept
     }
 
     @Test
-    public void testSummaryNotificationDecoding() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException, VerificationException {
+    public void testSummaryNotificationDecoding() throws IOException, NoSuchAlgorithmException, VerificationException {
         String signedNotification = SignedDataCreator.createSignedDataFromJson("models/signedSummaryNotification.json");
 
         ResponseBodyV2DecodedPayload notification = TestingUtility.getSignedPayloadVerifier().verifyAndDecodeNotification(signedNotification);
@@ -73,12 +72,12 @@ public void testSummaryNotificationDecoding() throws IOException, NoSuchAlgorith
     }
 
     @Test
-    public void testExternalPurchaseTokenNotificationDecoding() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException, VerificationException {
+    public void testExternalPurchaseTokenNotificationDecoding() throws IOException, NoSuchAlgorithmException, VerificationException {
         String signedNotification = SignedDataCreator.createSignedDataFromJson("models/signedExternalPurchaseTokenNotification.json");
 
         SignedDataVerifier verifier = new SignedDataVerifier(Set.of(new ByteArrayInputStream(TestingUtility.readBytes("certs/testCA.der"))), "com.example", 1234L, Environment.LOCAL_TESTING, false) {
             @Override
-            protected void verifyNotification(String bundleId, Long appAppleId, Environment notificationEnv) throws VerificationException {
+            protected void verifyNotification(String bundleId, Long appAppleId, Environment notificationEnv) {
                 Assertions.assertEquals("com.example", bundleId);
                 Assertions.assertEquals(55555, appAppleId);
                 Assertions.assertEquals(Environment.PRODUCTION, notificationEnv);
@@ -104,12 +103,12 @@ protected void verifyNotification(String bundleId, Long appAppleId, Environment
     }
 
     @Test
-    public void testExternalPurchaseTokenSandboxNotificationDecoding() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException, VerificationException {
+    public void testExternalPurchaseTokenSandboxNotificationDecoding() throws IOException, NoSuchAlgorithmException, VerificationException {
         String signedNotification = SignedDataCreator.createSignedDataFromJson("models/signedExternalPurchaseTokenSandboxNotification.json");
 
         SignedDataVerifier verifier = new SignedDataVerifier(Set.of(new ByteArrayInputStream(TestingUtility.readBytes("certs/testCA.der"))), "com.example", 1234L, Environment.LOCAL_TESTING, false) {
             @Override
-            protected void verifyNotification(String bundleId, Long appAppleId, Environment notificationEnv) throws VerificationException {
+            protected void verifyNotification(String bundleId, Long appAppleId, Environment notificationEnv) {
                 Assertions.assertEquals("com.example", bundleId);
                 Assertions.assertEquals(55555, appAppleId);
                 Assertions.assertEquals(Environment.SANDBOX, notificationEnv);

src/test/java/com/apple/itunes/storekit/offers/PromotionalOfferSignatureCreatorTest.java

@@ -13,6 +13,7 @@ class PromotionalOfferSignatureCreatorTest {
     @Test
     void testSignatureCreator() throws Exception {
         try (InputStream key = this.getClass().getClassLoader().getResourceAsStream("certs/testSigningKey.p8")) {
+            Assertions.assertNotNull(key);
             PromotionalOfferSignatureCreator signatureCreator = new PromotionalOfferSignatureCreator(new String(key.readAllBytes()), "keyId", "bundleId");
             String signature = signatureCreator.createSignature("productId", "offerId", "applicationUsername", UUID.fromString("20fba8a0-2b80-4a7d-a17f-85c1854727f8"), 1698148900000L);
             Assertions.assertNotNull(signature);

src/test/java/com/apple/itunes/storekit/util/SignedDataCreator.java

@@ -4,19 +4,11 @@
 
 import com.auth0.jwt.JWT;
 import com.auth0.jwt.algorithms.Algorithm;
-import com.auth0.jwt.interfaces.ECDSAKeyProvider;
 
 import java.io.IOException;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.security.KeyFactory;
 import java.security.KeyPairGenerator;
 import java.security.NoSuchAlgorithmException;
 import java.security.interfaces.ECPrivateKey;
-import java.security.spec.InvalidKeySpecException;
-import java.security.spec.PKCS8EncodedKeySpec;
-import java.util.Base64;
-import java.util.Map;
 
 public class SignedDataCreator {
 

src/test/java/com/apple/itunes/storekit/util/TestingUtility.java

@@ -4,6 +4,7 @@
 
 import com.apple.itunes.storekit.model.Environment;
 import com.apple.itunes.storekit.verification.SignedDataVerifier;
+import org.junit.jupiter.api.Assertions;
 
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
@@ -19,6 +20,7 @@ public static String readFile(String file) throws IOException {
 
     public static byte[] readBytes(String file) throws IOException {
         try (InputStream stream = TestingUtility.class.getClassLoader().getResourceAsStream(file)) {
+            Assertions.assertNotNull(stream);
             return stream.readAllBytes();
         }
     }