Fix checkstyle issues and android compatibility

smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/crypto/PainlessOpenPgpProvider.java

@@ -65,7 +65,7 @@ public class PainlessOpenPgpProvider implements OpenPgpProvider {
         }
 
         EncryptionStream cipherStream = PGPainless.createEncryptor().onOutputStream(cipherText)
-                .toRecipients(recipientKeys.toArray(new PGPPublicKeyRingCollection[]{}))
+                .toRecipients(recipientKeys.toArray(new PGPPublicKeyRingCollection[] {}))
                 .andToSelf(self.getAnnouncedPublicKeys())
                 .usingSecureAlgorithms()
                 .signWith(store.getKeyRingProtector(), self.getSigningKeyRing())
@@ -115,7 +115,7 @@ public class PainlessOpenPgpProvider implements OpenPgpProvider {
         }
 
         EncryptionStream cipherStream = PGPainless.createEncryptor().onOutputStream(cipherText)
-                .toRecipients(recipientKeys.toArray(new PGPPublicKeyRingCollection[]{}))
+                .toRecipients(recipientKeys.toArray(new PGPPublicKeyRingCollection[] {}))
                 .andToSelf(self.getAnnouncedPublicKeys())
                 .usingSecureAlgorithms()
                 .doNotSign()

smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/crypto/package-info.java

@@ -0,0 +1,20 @@
+/**
+ *
+ * Copyright 2018 Paul Schaub.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * Crypto Providers for XEP-0373: OpenPGP for XMPP using Bouncycastle.
+ */
+package org.jivesoftware.smackx.ox.crypto;

smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/selection_strategy/AnnouncedKeys.java

@@ -18,10 +18,7 @@ package org.jivesoftware.smackx.ox.selection_strategy;
 
 import java.util.Date;
 import java.util.Map;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
-import org.bouncycastle.openpgp.PGPException;
 import org.bouncycastle.openpgp.PGPPublicKeyRing;
 import org.bouncycastle.openpgp.PGPSecretKeyRing;
 import org.pgpainless.pgpainless.key.OpenPgpV4Fingerprint;
@@ -32,31 +29,17 @@ public class AnnouncedKeys {
 
     public static class PubKeyRingSelectionStrategy extends PublicKeyRingSelectionStrategy<Map<OpenPgpV4Fingerprint, Date>> {
 
-        private static final Logger LOGGER = Logger.getLogger(PubKeyRingSelectionStrategy.class.getName());
-
         @Override
         public boolean accept(Map<OpenPgpV4Fingerprint, Date> announcedKeys, PGPPublicKeyRing publicKeys) {
-            try {
             return announcedKeys.keySet().contains(new OpenPgpV4Fingerprint(publicKeys));
-            } catch (PGPException e) {
-                LOGGER.log(Level.WARNING, "Key might be damaged.", e);
-                return false;
-            }
         }
     }
 
     public static class SecKeyRingSelectionStrategy extends SecretKeyRingSelectionStrategy<Map<OpenPgpV4Fingerprint, Date>> {
 
-        private static final Logger LOGGER = Logger.getLogger(SecKeyRingSelectionStrategy.class.getName());
-
         @Override
         public boolean accept(Map<OpenPgpV4Fingerprint, Date> announcedKeys, PGPSecretKeyRing secretKeys) {
-            try {
             return announcedKeys.keySet().contains(new OpenPgpV4Fingerprint(secretKeys));
-            } catch (PGPException e) {
-                LOGGER.log(Level.WARNING, "Key might be damaged.", e);
-                return false;
-            }
         }
     }
 }

smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/store/filebased/FileBasedOpenPgpMetadataStore.java

@@ -20,7 +20,10 @@ import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.IOException;
-import java.nio.file.Files;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
 import java.text.ParseException;
 import java.util.Date;
 import java.util.HashMap;
@@ -29,9 +32,9 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import org.jivesoftware.smackx.ox.store.abstr.AbstractOpenPgpMetadataStore;
+import org.jivesoftware.smackx.ox.util.FileUtils;
 import org.jivesoftware.smackx.ox.util.Util;
 
-import org.bouncycastle.openpgp.PGPException;
 import org.jxmpp.jid.BareJid;
 import org.jxmpp.util.XmppDateTime;
 import org.pgpainless.pgpainless.key.OpenPgpV4Fingerprint;
@@ -68,7 +71,9 @@ public class FileBasedOpenPgpMetadataStore extends AbstractOpenPgpMetadataStore
 
         BufferedReader reader = null;
         try {
-            reader = Files.newBufferedReader(source.toPath(), Util.UTF8);
+            InputStream inputStream = FileUtils.prepareFileInputStream(source);
+            InputStreamReader isr = new InputStreamReader(inputStream, Util.UTF8);
+            reader = new BufferedReader(isr);
             Map<OpenPgpV4Fingerprint, Date> fingerprintDateMap = new HashMap<>();
 
             String line; int lineNr = 0;
@@ -86,7 +91,7 @@ public class FileBasedOpenPgpMetadataStore extends AbstractOpenPgpMetadataStore
                     OpenPgpV4Fingerprint fingerprint = new OpenPgpV4Fingerprint(split[0]);
                     Date date = XmppDateTime.parseXEP0082Date(split[1]);
                     fingerprintDateMap.put(fingerprint, date);
-                } catch (PGPException | ParseException e) {
+                } catch (IllegalArgumentException | ParseException e) {
                     LOGGER.log(Level.WARNING, "Error parsing fingerprint/date touple in line " + lineNr +
                             " of file " + source.getAbsolutePath(), e);
                 }
@@ -127,7 +132,9 @@ public class FileBasedOpenPgpMetadataStore extends AbstractOpenPgpMetadataStore
 
         BufferedWriter writer = null;
         try {
-            writer = Files.newBufferedWriter(destination.toPath(), Util.UTF8);
+            OutputStream outputStream = FileUtils.prepareFileOutputStream(destination);
+            OutputStreamWriter osw = new OutputStreamWriter(outputStream, Util.UTF8);
+            writer = new BufferedWriter(osw);
             for (OpenPgpV4Fingerprint fingerprint : data.keySet()) {
                 Date date = data.get(fingerprint);
                 String line = fingerprint.toString() + " " +

smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/store/filebased/FileBasedOpenPgpTrustStore.java

@@ -21,11 +21,15 @@ import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.IOException;
-import java.nio.file.Files;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
 import org.jivesoftware.smackx.ox.store.abstr.AbstractOpenPgpTrustStore;
+import org.jivesoftware.smackx.ox.util.FileUtils;
 import org.jivesoftware.smackx.ox.util.Util;
 
 import org.jxmpp.jid.BareJid;
@@ -50,7 +54,9 @@ public class FileBasedOpenPgpTrustStore extends AbstractOpenPgpTrustStore {
         File file = getTrustPath(owner, fingerprint);
         BufferedReader reader = null;
         try {
-            reader = Files.newBufferedReader(file.toPath(), Util.UTF8);
+            InputStream inputStream = FileUtils.prepareFileInputStream(file);
+            InputStreamReader isr = new InputStreamReader(inputStream, Util.UTF8);
+            reader = new BufferedReader(isr);
 
             Trust trust = null;
             String line; int lineNr = 0;
@@ -98,7 +104,10 @@ public class FileBasedOpenPgpTrustStore extends AbstractOpenPgpTrustStore {
 
         BufferedWriter writer = null;
         try {
-            writer = Files.newBufferedWriter(file.toPath(), Util.UTF8);
+            OutputStream outputStream = FileUtils.prepareFileOutputStream(file);
+            OutputStreamWriter osw = new OutputStreamWriter(outputStream, Util.UTF8);
+            writer = new BufferedWriter(osw);
+
             writer.write(trust.toString());
             writer.flush();
             writer.close();