groovy語法校驗和沙盒（sandbox）運行

groovy語法校驗主要解決腳本在編寫時能實時檢查語法是否正確，類似IDE的功能，沙盒運行主要解決系統若嵌入System.exit(0)，會導致整個應用停掉的問題

需要引用的依賴包如下：

<!-- https://mvnrepository.com/artifact/org.codehaus.groovy/groovy-all -->
<dependency>
    <groupId>org.codehaus.groovy</groupId>
    <artifactId>groovy-all</artifactId>
    <version>2.4.7</version>
</dependency>

<!-- https://mvnrepository.com/artifact/org.codehaus.groovy/groovy -->
<dependency>
    <groupId>org.codehaus.groovy</groupId>
    <artifactId>groovy</artifactId>
    <version>2.4.7</version>
</dependency>

<dependency>
    <groupId>org.kohsuke</groupId>
    <artifactId>groovy-sandbox</artifactId>
    <version>1.6</version>
</dependency>

方法很簡單，test類如下：

import groovy.lang.GroovyShell;
import org.codehaus.groovy.control.CompilerConfiguration;
import org.codehaus.groovy.control.ErrorCollector;
import org.codehaus.groovy.control.MultipleCompilationErrorsException;
import org.junit.Test;
import org.kohsuke.groovy.sandbox.GroovyInterceptor;
import org.kohsuke.groovy.sandbox.SandboxTransformer;

/**
 * @author wulongtao
 */
public class GroovyTest {

    /**
     * 語法校驗
     */
    @Test
    public void grammarCheck() {
        try {
            String expression = "if(a==1) return 1;";
            new GroovyShell().parse(expression);
        } catch(MultipleCompilationErrorsException cfe) {
            ErrorCollector errorCollector = cfe.getErrorCollector();
            System.out.println("Errors: "+errorCollector.getErrorCount());
        }
    }


    class NoSystemExitSandbox extends GroovyInterceptor {
        @Override
        public Object onStaticCall(GroovyInterceptor.Invoker invoker, Class receiver, String method, Object... args) throws Throwable {
            if (receiver==System.class && method=="exit")
                throw new SecurityException("No call on System.exit() please");
            return super.onStaticCall(invoker, receiver, method, args);
        }
    }

    class NoRunTimeSandbox extends GroovyInterceptor {
        @Override
        public Object onStaticCall(GroovyInterceptor.Invoker invoker, Class receiver, String method, Object... args) throws Throwable {
            if (receiver==Runtime.class)
                throw new SecurityException("No call on RunTime please");
            return super.onStaticCall(invoker, receiver, method, args);
        }
    }

    /**
     * 沙盒運行
     */
    @Test
    public void sandboxRun() {

        final GroovyShell sh = new GroovyShell(new CompilerConfiguration()
                .addCompilationCustomizers(new SandboxTransformer()));
        new NoSystemExitSandbox().register();
        new NoRunTimeSandbox().register();
        sh.evaluate("System.exit(0)");
    }

}