Interface additions and global changes to allow config to be modified

src/nodash/core/NoConfigDefault.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright 2014 David Horscroft
+ *
+ * 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.
+ * 
+ * The NoConfig is a means to store the server secret key, database address
+ * and other configs.
+ */
+
+package nodash.core;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.security.NoSuchAlgorithmException;
+
+import javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+
+import nodash.exceptions.NoDashFatalException;
+
+public class NoConfigDefault implements Serializable, NoConfigInterface {
+	private static final long serialVersionUID = -8498303909736017075L;
+
+	private static final String CONFIG_FILENAME = "noconfig.cfg";
+	
+	private SecretKey secretKey;
+	
+	private boolean saveDatabase = true;
+	private String databaseFileName = "nodatabase.hash";
+	private boolean saveByteSets = false;
+	
+	@Override
+	public void construct() {
+		try {
+			KeyGenerator keyGenerator = KeyGenerator.getInstance(NoUtil.CIPHER_KEY_SPEC);
+			keyGenerator.init(NoUtil.AES_STRENGTH);
+			this.secretKey = keyGenerator.generateKey();
+		} catch (NoSuchAlgorithmException e) {
+			throw new NoDashFatalException("Value for CIPHER_KEY_SPEC not valid.");
+		}
+	}
+
+	@Override
+	public SecretKey getSecretKey() {
+		return secretKey;
+	}
+
+	@Override
+	public boolean saveDatabase() {
+		return saveDatabase;
+	}
+	
+	public String getDatabaseName() {
+		return databaseFileName;
+	}
+
+	@Override
+	public boolean saveByteSets() {
+		return saveByteSets;
+	}
+
+	@Override
+	public void saveNoConfig() {
+		try {
+			File file = new File(NoConfigDefault.CONFIG_FILENAME);
+			ByteArrayOutputStream baos = new ByteArrayOutputStream();
+			ObjectOutputStream oos = new ObjectOutputStream(baos);
+			oos.writeObject(this);
+			byte[] data = baos.toByteArray();
+		
+			Files.write(file.toPath(), data, StandardOpenOption.CREATE_NEW);
+		} catch (IOException e) {
+			throw new NoDashFatalException("Unable to save config, including generated secret key.");
+		}
+	}
+
+	@Override
+	public NoConfigInterface loadNoConfig() throws IOException {
+		File file = new File(NoConfigDefault.CONFIG_FILENAME);
+		byte[] data = Files.readAllBytes(file.toPath());
+		ByteArrayInputStream bais = new ByteArrayInputStream(data);
+		ObjectInputStream ois = new ObjectInputStream(bais);
+		NoConfigInterface noConfig;
+		try {
+			noConfig = (NoConfigDefault) ois.readObject();
+		} catch (ClassNotFoundException e) {
+			throw new NoDashFatalException("Given bytestream does not compile into a configuration object.");
+		}
+		return noConfig;
+	}
+}