MessagePayload: derive signed from signedBy

simulator/src/main/java/byzzbench/simulator/transport/MessagePayload.java

@@ -1,40 +1,40 @@
 package byzzbench.simulator.transport;
 
-import java.io.Serializable;
-
 import lombok.Getter;
 
+import java.io.Serializable;
+
 /**
  * Interface for the payload of a {@link MessageEvent}.
  */
 @Getter
 public abstract class MessagePayload implements Serializable {
-  // Could be removed as we can just check
-  // signedBy != null
-  private boolean signed;
-  private String signedBy;
-
-  /**
-   * A string representation of the message type.
-   */
-  public abstract String getType();
-
-
-  /*
-  * Dummy function to validate the signature of the
-  * message instance. Returns true if the message was
-  * signed by @param id.
-  */
-  public boolean isSignedBy(String id) {
-    return this.signed && this.signedBy.equals(id);
-  }
-
-  /*
-  * Dummy function to sign the message with the public
-  * key of the @param sender.
-  */
-  public void sign(String sender) {
-    this.signed = true;
-    this.signedBy = sender;
-  }
+    private String signedBy;
+
+    /**
+     * A string representation of the message type.
+     */
+    public abstract String getType();
+
+
+    /*
+     * Dummy function to validate the signature of the
+     * message instance. Returns true if the message was
+     * signed by @param id.
+     */
+    public boolean isSignedBy(String id) {
+        return this.isSigned() && this.signedBy.equals(id);
+    }
+
+    /*
+     * Dummy function to sign the message with the public
+     * key of the @param sender.
+     */
+    public void sign(String sender) {
+        this.signedBy = sender;
+    }
+
+    public boolean isSigned() {
+        return this.signedBy != null;
+    }
 }