Provide a path for not existing key in exception in offline mode

src/main/java/org/simplify4u/plugins/AbstractPGPMojo.java

@@ -155,6 +155,7 @@ protected void setupMojo() throws MojoFailureException {
                 .keyServers(pgpKeyServer)
                 .loadBalance(pgpKeyServerLoadBalance)
                 .notFoundRefreshHours(keyNotFoundRefreshHour)
+                .offLine(session.isOffline())
                 .build();
 
         try {

src/main/java/org/simplify4u/plugins/keyserver/KeyCacheSettings.java

@@ -34,4 +34,6 @@ public class KeyCacheSettings {
     boolean loadBalance;
 
     int notFoundRefreshHours;
+
+    boolean offLine;
 }

src/main/java/org/simplify4u/plugins/keyserver/KeyServerClientSettings.java

@@ -60,8 +60,4 @@ public Optional<Proxy> getProxy() {
                 .filter(proxy -> proxyName.equalsIgnoreCase(proxy.getId()))
                 .findFirst();
     }
-
-    public boolean isOffline() {
-        return mavenSession.isOffline();
-    }
 }

src/main/java/org/simplify4u/plugins/keyserver/PGPKeysCache.java

@@ -66,6 +66,7 @@ public class PGPKeysCache {
     private File cachePath;
     private int notFoundRefreshHours;
     private KeyServerList keyServerList;
+    private boolean offLine;
 
     PGPKeysCache() {
     }
@@ -89,6 +90,7 @@ void init(KeyCacheSettings cacheSettings, List<PGPKeysServerClient> pgpKeysServe
         this.cachePath = cacheSettings.getCachePath();
         this.notFoundRefreshHours = cacheSettings.getNotFoundRefreshHours();
         this.keyServerList = createKeyServerList(pgpKeysServerClients, cacheSettings.isLoadBalance());
+        this.offLine = cacheSettings.isOffLine();
 
         LOGGER.info("Key server(s) - {}", keyServerList);
 
@@ -167,7 +169,9 @@ public PGPPublicKeyRing getKeyRing(KeyId keyID) throws IOException {
 
         synchronized (LOCK) {
 
-            checkNotFoundCache(path);
+            if (!offLine) {
+                checkNotFoundCache(path);
+            }
 
             if (keyFile.exists()) {
                 // load from cache
@@ -177,6 +181,11 @@ public PGPPublicKeyRing getKeyRing(KeyId keyID) throws IOException {
                 }
             }
 
+            if (offLine) {
+                throw new IOException("Key " + keyID + " not exits in cache under path: " + keyFile
+                        + " it is not possible to download in offline mode");
+            }
+
             // key not exists in cache or something wrong with cache, so receive from servers
             return Try.of(() -> keyServerList.execute(keysServerClient -> receiveKey(keyFile, keyID, keysServerClient)))
                     .onFailure(PGPKeyNotFound.class, e -> writeNotFoundCache(path))

src/main/java/org/simplify4u/plugins/keyserver/PGPKeysServerClient.java

@@ -193,9 +193,6 @@ void copyKeyToOutputStream(KeyId keyId, OutputStream outputStream, OnRetryConsum
             throws IOException {
 
         final URI keyUri = getUriForGetKey(keyId);
-        if (keyServerClientSettings.isOffline()) {
-            throw new IOException("Not possible to download key: " + keyUri + " in offline mode.");
-        }
 
         final HttpUriRequest request = new HttpGet(keyUri);
 

src/test/java/org/simplify4u/plugins/keyserver/PGPKeysCacheTest.java

@@ -44,11 +44,9 @@
 
 import com.google.common.io.ByteStreams;
 import com.google.common.io.MoreFiles;
-import com.google.common.io.RecursiveDeleteOption;
 import org.bouncycastle.openpgp.PGPPublicKeyRing;
-import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.extension.ExtendWith;
+import org.junit.jupiter.api.io.TempDir;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.mockito.InjectMocks;
@@ -69,6 +67,7 @@ class PGPKeysCacheTest {
 
     public static final KeyId KEY_ID_1 = KeyId.from(1L);
 
+    @TempDir
     private Path cachePath;
 
     @Spy
@@ -108,16 +107,6 @@ private List<PGPKeysServerClient> prepareKeyServerClientWithNotFound() throws IO
         return Collections.singletonList(keysServerClient);
     }
 
-    @BeforeEach
-    void setup() throws IOException {
-        cachePath = Files.createTempDirectory("cache-path-test");
-    }
-
-    @AfterEach
-    void cleanup() throws IOException {
-        MoreFiles.deleteRecursively(cachePath, RecursiveDeleteOption.ALLOW_INSECURE);
-    }
-
     @Test
     void emptyCacheDirShouldBeCreated() throws IOException {
 
@@ -218,6 +207,31 @@ void notFoundKeyFromCache() throws IOException {
         verify(keysServerClients.get(0)).copyKeyToOutputStream(eq(keyId), any(), any());
     }
 
+    @Test
+    void notFoundKeyFromCacheInOfflineMode() throws IOException {
+
+        KeyCacheSettings cacheSettings = KeyCacheSettings.builder()
+                .cachePath(cachePath.toFile())
+                .offLine(true)
+                .build();
+
+        pgpKeysCache.init(cacheSettings, Collections.singletonList(keysServerClient));
+
+        KeyId keyId = KeyId.from(0x1234567890L);
+
+        assertThatCode(() -> pgpKeysCache.getKeyRing(keyId))
+                .isExactlyInstanceOf(IOException.class)
+                .hasMessageContainingAll("not exits in cache under path", "it is not possible to download in offline mode");
+
+
+        File notFoundCache = new File(cachePath.toFile(), keyId.getHashPath() + ".404");
+
+        assertThat(notFoundCache).doesNotExist();
+
+        // client was not call at all
+        verifyNoInteractions(keysServerClient);
+    }
+
     @Test
     void notFoundKeyCacheShouldBeEvicted() throws IOException {
         List<PGPKeysServerClient> keysServerClients = prepareKeyServerClientWithNotFound();

src/test/java/org/simplify4u/plugins/keyserver/PGPKeysServerClientTest.java

@@ -116,24 +116,6 @@ private void runProxyConfig(Proxy proxy) {
         verify(clientBuilder).build();
     }
 
-    @Test
-    void offLineModeShouldThrowIOException() throws URISyntaxException {
-
-        URI uri = new URI("https://localhost/");
-
-        when(mavenSession.isOffline()).thenReturn(true);
-
-        KeyServerClientSettings clientSettings = KeyServerClientSettings.builder()
-                .mavenSession(mavenSession)
-                .build();
-
-        PGPKeysServerClient pgpKeysServerClient = new PGPKeysServerClient(uri, clientSettings);
-
-        assertThatThrownBy(() -> pgpKeysServerClient.copyKeyToOutputStream(KeyId.from(0x0123456789ABCDEFL), null, null))
-                .isExactlyInstanceOf(IOException.class)
-                .hasMessage("Not possible to download key: https://localhost/pks/lookup?op=get&options=mr&search=0x0123456789ABCDEF in offline mode.");
-    }
-
     @Test
     void unsupportedProtocolShouldThrowIOException() throws IOException {
         assertThatThrownBy(() -> PGPKeysServerClient.getClient("abc://loclahost", null))