Return nonce header

acme4j-client/src/main/java/org/shredzone/acme4j/connector/Connection.java

@@ -116,12 +116,11 @@ public interface Connection extends AutoCloseable {
     void handleRetryAfter(String message) throws AcmeException;
 
     /**
-     * Updates a {@link Session} by evaluating the HTTP response header.
+     * Gets the nonce from the nonce header.
      *
-     * @param session
+     * @return Nonce, or {@code null} if no nonce header was set
-     *            {@link Session} instance to be updated
      */
-    void updateSession(Session session);
+    byte[] getNonce();
 
     /**
      * Gets a location from the {@code Location} header.

acme4j-client/src/main/java/org/shredzone/acme4j/connector/DefaultConnection.java

@@ -112,11 +112,11 @@ public class DefaultConnection implements Connection {
                 throwAcmeException();
             }
 
-            updateSession(session);
+            byte[] nonce = getNonce();
-
+            if (nonce == null) {
-            if (session.getNonce() == null) {
                 throw new AcmeProtocolException("Server did not provide a nonce");
             }
+            session.setNonce(nonce);
         } catch (IOException ex) {
             throw new AcmeNetworkException(ex);
         } finally {
@@ -241,12 +241,12 @@ public class DefaultConnection implements Connection {
     }
 
     @Override
-    public void updateSession(Session session) {
+    public byte[] getNonce() {
         assertConnectionIsOpen();
 
         String nonceHeader = conn.getHeaderField(REPLAY_NONCE_HEADER);
         if (nonceHeader == null || nonceHeader.trim().isEmpty()) {
-            return;
+            return null;
         }
 
         if (!BASE64URL_PATTERN.matcher(nonceHeader).matches()) {
@@ -255,7 +255,7 @@ public class DefaultConnection implements Connection {
 
         LOG.debug("Replay Nonce: {}", nonceHeader);
 
-        session.setNonce(Base64Url.decode(nonceHeader));
+        return Base64Url.decode(nonceHeader);
     }
 
     @Override
@@ -353,7 +353,7 @@ public class DefaultConnection implements Connection {
 
             logHeaders();
 
-            updateSession(session);
+            session.setNonce(getNonce());
 
             int rc = conn.getResponseCode();
             if ((httpStatus.length == 0 && rc != HttpURLConnection.HTTP_OK)

acme4j-client/src/main/java/org/shredzone/acme4j/provider/AbstractAcmeProvider.java

@@ -53,7 +53,10 @@ public abstract class AbstractAcmeProvider implements AcmeProvider {
             conn.sendRequest(resolve(serverUri), session);
 
             // use nonce header if there is one, saves a HEAD request...
-            conn.updateSession(session);
+            byte[] nonce = conn.getNonce();
+            if (nonce != null) {
+                session.setNonce(nonce);
+            }
 
             return conn.readJsonResponse();
         }

acme4j-client/src/test/java/org/shredzone/acme4j/connector/DefaultConnectionTest.java

@@ -97,9 +97,8 @@ public class DefaultConnectionTest {
         assertThat(session.getNonce(), is(nullValue()));
         try (DefaultConnection conn = new DefaultConnection(mockHttpConnection)) {
             conn.conn = mockUrlConnection;
-            conn.updateSession(session);
+            assertThat(conn.getNonce(), is(nullValue()));
         }
-        assertThat(session.getNonce(), is(nullValue()));
 
         verify(mockUrlConnection).getHeaderField("Replay-Nonce");
         verifyNoMoreInteractions(mockUrlConnection);
@@ -116,9 +115,8 @@ public class DefaultConnectionTest {
 
         try (DefaultConnection conn = new DefaultConnection(mockHttpConnection)) {
             conn.conn = mockUrlConnection;
-            conn.updateSession(session);
+            assertThat(conn.getNonce(), is(TestUtils.DUMMY_NONCE));
         }
-        assertThat(session.getNonce(), is(TestUtils.DUMMY_NONCE));
 
         verify(mockUrlConnection).getHeaderField("Replay-Nonce");
         verifyNoMoreInteractions(mockUrlConnection);
@@ -136,7 +134,7 @@ public class DefaultConnectionTest {
 
         try (DefaultConnection conn = new DefaultConnection(mockHttpConnection)) {
             conn.conn = mockUrlConnection;
-            conn.updateSession(session);
+            conn.getNonce();
             fail("Expected to fail");
         } catch (AcmeProtocolException ex) {
             assertThat(ex.getMessage(), org.hamcrest.Matchers.startsWith("Invalid replay nonce"));
@@ -677,17 +675,18 @@ public class DefaultConnectionTest {
                 } else {
                     fail("unknown nonce");
                 }
-            };
+            }
 
             @Override
-            public void updateSession(Session session) {
+            public byte[] getNonce() {
                 assertThat(session, is(sameInstance(DefaultConnectionTest.this.session)));
                 if (session.getNonce() == nonce1) {
-                    session.setNonce(nonce2);
+                    return nonce2;
                 } else {
                     fail("unknown nonce");
+                    return null;
                 }
-            };
+            }
         }) {
             JSONBuilder cb = new JSONBuilder();
             cb.put("foo", 123).put("bar", "a-string");
@@ -752,17 +751,18 @@ public class DefaultConnectionTest {
                 } else {
                     fail("unknown nonce");
                 }
-            };
+            }
 
             @Override
-            public void updateSession(Session session) {
+            public byte[] getNonce() {
                 assertThat(session, is(sameInstance(DefaultConnectionTest.this.session)));
                 if (session.getNonce() == nonce1) {
-                    session.setNonce(nonce2);
+                    return nonce2;
                 } else {
                     fail("unknown nonce");
+                    return null;
                 }
-            };
+            }
         }) {
             JSONBuilder cb = new JSONBuilder();
             cb.put("foo", 123).put("bar", "a-string");

acme4j-client/src/test/java/org/shredzone/acme4j/connector/DummyConnection.java

@@ -67,7 +67,7 @@ public class DummyConnection implements Connection {
     }
 
     @Override
-    public void updateSession(Session session) {
+    public byte[] getNonce() {
         throw new UnsupportedOperationException();
     }
 

acme4j-client/src/test/java/org/shredzone/acme4j/provider/AbstractAcmeProviderTest.java

@@ -15,7 +15,6 @@ package org.shredzone.acme4j.provider;
 
 import static org.hamcrest.Matchers.*;
 import static org.junit.Assert.*;
-import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.*;
 import static org.shredzone.acme4j.toolbox.TestUtils.getJSON;
 import static uk.co.datumedge.hamcrest.json.SameJSONAs.sameJSONAs;
@@ -110,7 +109,7 @@ public class AbstractAcmeProviderTest {
         assertThat(map.toString(), sameJSONAs(TestUtils.getJSON("directory").toString()));
 
         verify(connection).sendRequest(testResolvedUrl, session);
-        verify(connection).updateSession(any(Session.class));
+        verify(connection).getNonce();
         verify(connection).readJsonResponse();
         verify(connection).close();
         verifyNoMoreInteractions(connection);