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The Burp Suite Utils project provides developers with APIs for building Burp Suite Extensions.
There is a newer version: 1.2.5
package burp;

/*
 * @(#)IScannerCheck.java
 *
 * Copyright PortSwigger Ltd. All rights reserved.
 *
 * This code may be used to extend the functionality of Burp Suite Free Edition
 * and Burp Suite Professional, provided that this usage does not violate the
 * license terms for those products.
 */
import java.util.List;

/**
 * Extensions can implement this interface and then call
 * IBurpExtenderCallbacks.registerScannerCheck() to register a
 * custom Scanner check. When performing scanning, Burp will ask the check to
 * perform active or passive scanning on the base request, and report any
 * Scanner issues that are identified.
 */
public interface IScannerCheck
{

    /**
     * The Scanner invokes this method for each base request / response that is
     * passively scanned. Note: Extensions should only analyze the
     * HTTP messages provided during passive scanning, and should not make any
     * new HTTP requests of their own.
     *
     * @param baseRequestResponse The base HTTP request / response that should
     * be passively scanned.
     * @return A list of IScanIssue objects, or null
     * if no issues are identified.
     */
    List doPassiveScan(IHttpRequestResponse baseRequestResponse);

    /**
     * The Scanner invokes this method for each insertion point that is actively
     * scanned. Extensions may issue HTTP requests as required to carry out
     * active scanning, and should use the
     * IScannerInsertionPoint object provided to build scan
     * requests for particular payloads.
     * Note:
     * Scan checks should submit raw non-encoded payloads to insertion points,
     * and the insertion point has responsibility for performing any data
     * encoding that is necessary given the nature and location of the insertion
     * point.
     *
     * @param baseRequestResponse The base HTTP request / response that should
     * be actively scanned.
     * @param insertionPoint An IScannerInsertionPoint object that
     * can be queried to obtain details of the insertion point being tested, and
     * can be used to build scan requests for particular payloads.
     * @return A list of IScanIssue objects, or null
     * if no issues are identified.
     */
    List doActiveScan(
            IHttpRequestResponse baseRequestResponse,
            IScannerInsertionPoint insertionPoint);

    /**
     * The Scanner invokes this method when the custom Scanner check has
     * reported multiple issues for the same URL path. This can arise either
     * because there are multiple distinct vulnerabilities, or because the same
     * (or a similar) request has been scanned more than once. The custom check
     * should determine whether the issues are duplicates. In most cases, where
     * a check uses distinct issue names or descriptions for distinct issues,
     * the consolidation process will simply be a matter of comparing these
     * features for the two issues.
     *
     * @param existingIssue An issue that was previously reported by this
     * Scanner check.
     * @param newIssue An issue at the same URL path that has been newly
     * reported by this Scanner check.
     * @return An indication of which issue(s) should be reported in the main
     * Scanner results. The method should return -1 to report the
     * existing issue only, 0 to report both issues, and
     * 1 to report the new issue only.
     */
    int consolidateDuplicateIssues(
            IScanIssue existingIssue,
            IScanIssue newIssue);
}