如何为詹金斯申请面包屑发行人

Question

我想使用Jenkins远程API，并且正在寻找安全的解决方案。我碰到了Prevent Cross Site Request Forgery exploits，我想使用它，但是我读到某个地方，你必须提出一个面包屑请求。

如何获得面包屑请求以使API正常工作？

我找到了https://github.com/entagen/jenkins-build-per-branch/pull/20，但仍然不知道如何解决。

我的詹金斯版本是1.50.x。

使用POST请求时，经过身份验证的远程API请求以403响应

Answer 1

我也没有在文档中找到这个。此代码已针对较旧的Jenkins（1.466）进行了测试，但仍可以使用。

要发出面包屑，请使用 crumbIssuer

// left out: you need to authenticate with user & password -> sample below
HttpGet httpGet = new HttpGet(jenkinsUrl + "crumbIssuer/api/json");
String crumbResponse = toString(httpclient, httpGet);
CrumbJson crumbJson = new Gson().fromJson(crumbResponse, CrumbJson.class);

这会给你这样的回应

{"crumb":"fb171d526b9cc9e25afe80b356e12cb7","crumbRequestField":".crumb"}

其中包含您需要的两条信息

1. 您需要传递面包屑的字段名称
2. 面包屑本身

如果您现在想从詹金斯（Jenkins）那里获取东西，请将面包屑添加为标题。在下面的示例中，我获取了最新的构建结果。

HttpPost httpost = new HttpPost(jenkinsUrl + "rssLatest");
httpost.addHeader(crumbJson.crumbRequestField, crumbJson.crumb);

这里是整体示例代码。我正在使用gson
2.2.4
解析响应，其余部分则使用Apache的httpclient
4.2.3
。

import org.apache.http.auth.*;
import org.apache.http.client.*;
import org.apache.http.client.methods.*;
import org.apache.http.impl.client.*;

import com.google.gson.Gson;

public class JenkinsMonitor {

    public static void main(String[] args) throws Exception {

        String protocol = "http";
        String host = "your-jenkins-host.com";
        int port = 8080;
        String usernName = "username";
        String password = "passwort";

        DefaultHttpClient httpclient = new DefaultHttpClient();
        httpclient.getCredentialsProvider().setCredentials(
                new AuthScope(host, port), 
                new UsernamePasswordCredentials(usernName, password));

        String jenkinsUrl = protocol + "://" + host + ":" + port + "/jenkins/";

        try {
            // get the crumb from Jenkins
            // do this only once per HTTP session
            // keep the crumb for every coming request
            System.out.println("... issue crumb");
            HttpGet httpGet = new HttpGet(jenkinsUrl + "crumbIssuer/api/json");
            String crumbResponse= toString(httpclient, httpGet);
            CrumbJson crumbJson = new Gson()
                .fromJson(crumbResponse, CrumbJson.class);

            // add the issued crumb to each request header
            // the header field name is also contained in the json response
            System.out.println("... issue rss of latest builds");
            HttpPost httpost = new HttpPost(jenkinsUrl + "rssLatest");
            httpost.addHeader(crumbJson.crumbRequestField, crumbJson.crumb);
            toString(httpclient, httpost);

        } finally {
            httpclient.getConnectionManager().shutdown();
        }

    }

    // helper construct to deserialize crumb json into 
    public static class CrumbJson {
        public String crumb;
        public String crumbRequestField;
    }

    private static String toString(DefaultHttpClient client, 
        HttpRequestBase request) throws Exception {
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        String responseBody = client.execute(request, responseHandler);
        System.out.println(responseBody + "\n");
        return responseBody;
    }

}