/**
 * Find Security Bugs
 * Copyright (c) Philippe Arteau, All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */
package com.h3xstream.findsecbugs.csrf;

import com.h3xstream.findsecbugs.common.matcher.InvokeMatcherBuilder;
import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.Priorities;
import edu.umd.cs.findbugs.bcel.OpcodeStackDetector;
import org.apache.bcel.Constants;

import static com.h3xstream.findsecbugs.common.matcher.InstructionDSL.invokeInstruction;

/**
 * Detects the disabling of Spring CSRF protection
 *
 * @author Pablo Tamarit
 */
public class SpringCsrfProtectionDisabledDetector extends OpcodeStackDetector {

    private static final String SPRING_CSRF_PROTECTION_DISABLED_TYPE = "SPRING_CSRF_PROTECTION_DISABLED";

    private static final InvokeMatcherBuilder CSRF_CONFIGURER_DISABLE_METHOD = invokeInstruction() //
            .atClass("org/springframework/security/config/annotation/web/configurers/CsrfConfigurer") //
            .atMethod("disable");

    private BugReporter bugReporter;

    public SpringCsrfProtectionDisabledDetector(BugReporter bugReporter) {
        this.bugReporter = bugReporter;
    }

    @Override
    public void sawOpcode(int seen) {

        if (seen == Constants.INVOKEVIRTUAL && CSRF_CONFIGURER_DISABLE_METHOD.matches(this)) {
            bugReporter.reportBug(new BugInstance(this, SPRING_CSRF_PROTECTION_DISABLED_TYPE, Priorities.HIGH_PRIORITY) //
                    .addClass(this).addMethod(this).addSourceLine(this));
        }
    }
}