Some testing and SubkeyLookup mechanism

pgp-cert-d-java/src/main/java/pgp/cert_d/BaseDirectoryProvider.java

@@ -5,6 +5,7 @@
 package pgp.cert_d;
 
 import java.io.File;
+import java.nio.file.Paths;
 
 public class BaseDirectoryProvider {
 
@@ -18,29 +19,28 @@ public class BaseDirectoryProvider {
         // return OS-specific default dir
         String osName = System.getProperty("os.name", "generic")
                 .toLowerCase();
-        return getDefaultBaseDirForOS(osName, File.separator);
+        return getDefaultBaseDirForOS(osName);
     }
 
-    public static File getDefaultBaseDirForOS(String osName, String separator) {
+    public static File getDefaultBaseDirForOS(String osName) {
         String STORE_NAME = "pgp.cert.d";
         if (osName.contains("win")) {
-            String appData = System.getenv("APPDATA");
-            String roaming = appData + separator + "Roaming";
-            return new File(roaming, STORE_NAME);
+            // %APPDATA%\Roaming\pgp.cert.d
+            return Paths.get(System.getenv("APPDATA"), "Roaming", STORE_NAME).toFile();
         }
 
         if (osName.contains("nux")) {
+            // $XDG_DATA_HOME/pgp.cert.d
             String xdg_data_home = System.getenv("XDG_DATA_HOME");
-            String rootPath = xdg_data_home;
-            if (xdg_data_home == null) {
-                rootPath = System.getProperty("user.home") + separator + ".local" + separator + "share";
+            if (xdg_data_home != null) {
+                return Paths.get(xdg_data_home, STORE_NAME).toFile();
             }
-            return new File(rootPath, STORE_NAME);
+            // $HOME/.local/share/pgp.cert.d
+            return Paths.get(System.getProperty("user.home"), ".local", "share", STORE_NAME).toFile();
         }
 
         if (osName.contains("mac")) {
-            String home = System.getenv("HOME");
-            return new File(home + separator + "Library" + separator + "Application Support", STORE_NAME);
+            return Paths.get(System.getenv("HOME"), "Library", "Application Support", STORE_NAME).toFile();
         }
 
         throw new IllegalArgumentException("Unknown OS " + osName);

pgp-cert-d-java/src/main/java/pgp/cert_d/CachingSharedPGPCertificateDirectoryWrapper.java

@@ -75,6 +75,11 @@ public class CachingSharedPGPCertificateDirectoryWrapper
         tagMap.clear();
     }
 
+    @Override
+    public LockingMechanism getLock() {
+        return underlyingCertificateDirectory.getLock();
+    }
+
     @Override
     public Certificate getByFingerprint(String fingerprint)
             throws IOException, BadNameException, BadDataException {

pgp-cert-d-java/src/main/java/pgp/cert_d/InMemorySubkeyLookup.java

@@ -0,0 +1,23 @@
+package pgp.cert_d;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class InMemorySubkeyLookup implements SubkeyLookup {
+
+    private static final Map<Long, String> subkeyMap = new HashMap<>();
+
+    @Override
+    public String getIdentifierForSubkeyId(long subkeyId) {
+        return subkeyMap.get(subkeyId);
+    }
+
+    @Override
+    public void storeIdentifierForSubkeyId(long subkeyId, String identifier) {
+        subkeyMap.put(subkeyId, identifier);
+    }
+
+    public void clear() {
+        subkeyMap.clear();
+    }
+}

pgp-cert-d-java/src/main/java/pgp/cert_d/SharedPGPCertificateDirectory.java

@@ -15,6 +15,8 @@ import pgp.certificate_store.MergeCallback;
 
 public interface SharedPGPCertificateDirectory {
 
+    LockingMechanism getLock();
+
     Certificate getByFingerprint(String fingerprint)
             throws IOException, BadNameException, BadDataException;
 

pgp-cert-d-java/src/main/java/pgp/cert_d/SharedPGPCertificateDirectoryImpl.java

@@ -69,6 +69,11 @@ public class SharedPGPCertificateDirectoryImpl implements SharedPGPCertificateDi
         }
     }
 
+    @Override
+    public LockingMechanism getLock() {
+        return writeLock;
+    }
+
     @Override
     public Certificate getByFingerprint(String fingerprint)
             throws IOException, BadNameException, BadDataException {

pgp-cert-d-java/src/main/java/pgp/cert_d/SubkeyLookup.java

@@ -0,0 +1,25 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package pgp.cert_d;
+
+public interface SubkeyLookup {
+
+    /**
+     * Lookup the identifier of the certificate that contains the given subkey.
+     * If no record is found, return null.
+     *
+     * @param subkeyId subkey id
+     * @return identifier (fingerprint or special name) of the certificate
+     */
+    String getIdentifierForSubkeyId(long subkeyId);
+
+    /**
+     * Store a record of the subkey id that points to the identifier.
+     *
+     * @param subkeyId subkey id
+     * @param identifier fingerprint or special name of the certificate
+     */
+    void storeIdentifierForSubkeyId(long subkeyId, String identifier);
+}

pgp-cert-d-java/src/main/java/pgp/cert_d/SubkeyLookupImpl.java

@@ -0,0 +1,19 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package pgp.cert_d;
+
+public class SubkeyLookupImpl implements SubkeyLookup {
+
+    @Override
+    public String getIdentifierForSubkeyId(long subkeyId) {
+        return null;
+    }
+
+    @Override
+    public void storeIdentifierForSubkeyId(long subkeyId, String identifier) {
+
+    }
+
+}