Merge pull request #177 from Wiewiogr/148-secret-key

Add secret key generator #148

Server/src/main/java/net/simon987/server/GameServer.java

@@ -1,12 +1,12 @@
 package net.simon987.server;
 
-
 import com.mongodb.MongoClient;
 import com.mongodb.client.MongoCollection;
 import com.mongodb.client.MongoCursor;
 import com.mongodb.client.MongoDatabase;
 import com.mongodb.client.model.ReplaceOptions;
 import net.simon987.server.crypto.CryptoProvider;
+import net.simon987.server.crypto.SecretKeyGenerator;
 import net.simon987.server.event.GameEvent;
 import net.simon987.server.event.GameEventDispatcher;
 import net.simon987.server.event.TickEvent;
@@ -54,6 +54,8 @@ public class GameServer implements Runnable {
 
     private GameRegistry gameRegistry;
 
+    private String secretKey;
+
     public GameServer() {
         this.config = new ServerConfiguration("config.properties");
 
@@ -76,6 +78,13 @@ public class GameServer implements Runnable {
 
         dayNightCycle = new DayNightCycle();
 
+        SecretKeyGenerator keyGenerator = new SecretKeyGenerator();
+        secretKey = config.getString("secret_key");
+        if (secretKey == null) {
+            secretKey = keyGenerator.generate();
+            config.setString("secret_key", secretKey);
+        }
+
         //Load all plugins in plugins folder, if it doesn't exist, create it
         File pluginDir = new File("plugins/");
         File[] pluginDirListing = pluginDir.listFiles();
@@ -176,12 +185,10 @@ public class GameServer implements Runnable {
                     user.getControlledUnit().getCpu().reset();
                     int cost = user.getControlledUnit().getCpu().execute(timeout);
                     user.getControlledUnit().spendEnergy(cost);
-
                 } catch (Exception e) {
                     LogManager.LOGGER.severe("Error executing " + user.getUsername() + "'s code");
                     e.printStackTrace();
                 }
-
             }
         }
 
@@ -312,4 +319,13 @@ public class GameServer implements Runnable {
     public GameRegistry getRegistry() {
         return gameRegistry;
     }
+
+    public String getSecretKey() {
+        return secretKey;
+    }
+
+    public void setSecretKey(String secretKey) {
+        this.secretKey = secretKey;
+        config.setString("secret_key", secretKey);
+    }
 }

Server/src/main/java/net/simon987/server/crypto/SecretKeyGenerator.java

@@ -0,0 +1,27 @@
+package net.simon987.server.crypto;
+
+import javax.crypto.KeyGenerator;
+import javax.crypto.SecretKey;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+import java.util.Base64;
+
+public class SecretKeyGenerator {
+
+    private static final String KEY_GENERATION_ALGORITHM = "HmacSHA1";
+    private KeyGenerator keyGen;
+
+    public SecretKeyGenerator() {
+        try {
+            keyGen = KeyGenerator.getInstance(KEY_GENERATION_ALGORITHM);
+        } catch (NoSuchAlgorithmException e) {
+            throw new RuntimeException("Error creating Key generator", e);
+        }
+        keyGen.init(new SecureRandom(SecureRandom.getSeed(32)));
+    }
+
+    public String generate() {
+        SecretKey secretKey = keyGen.generateKey();
+        return Base64.getEncoder().encodeToString(secretKey.getEncoded());
+    }
+}

Server/src/main/resources/config.properties

@@ -83,3 +83,6 @@ electric_box_damage=5
 electric_box_energy_given=70
 #RadioactiveObstacle
 radioactive_obstacle_corruption_block_size=10
+
+#SecretKey
+secret_key=<your_secret_key>