Carry certificate of the update center mirror (#115)

* Carry certificate of the update center mirror

* Add redirect button

src/main/java/io/jenkins/plugins/localization_zh_cn/UpdateCenterAction.java

+package io.jenkins.plugins.localization_zh_cn;
+
+import hudson.Extension;
+import hudson.model.RootAction;
+import jenkins.model.Jenkins;
+import org.apache.commons.io.IOUtils;
+import org.kohsuke.stapler.StaplerResponse;
+import org.kohsuke.stapler.interceptor.RequirePOST;
+
+import javax.annotation.CheckForNull;
+import javax.servlet.http.HttpServletResponse;
+import java.io.*;
+
+@Extension
+public class UpdateCenterAction implements RootAction {
+    private final String CRT = "mirror-adapter.crt";
+
+    @RequirePOST
+    public void doUse(StaplerResponse response) throws IOException {
+        if (!Jenkins.get().hasPermission(Jenkins.ADMINISTER)) {
+            response.sendError(HttpServletResponse.SC_FORBIDDEN);
+            return;
+        }
+
+        try (InputStream input = this.getClass().getResourceAsStream("/" + CRT);
+             OutputStream output = new FileOutputStream(new File(Jenkins.get().getRootDir(),
+                     "/war/WEB-INF/update-center-rootCAs/" + CRT))) {
+            if (input == null) {
+                return;
+            }
+
+            IOUtils.copy(input, output);
+        }
+        response.sendRedirect(Jenkins.get().getRootUrl() + "/chinese");
+    }
+
+    @RequirePOST
+    public void doRemove(StaplerResponse response) throws IOException {
+        if (!Jenkins.get().hasPermission(Jenkins.ADMINISTER)) {
+            response.sendError(HttpServletResponse.SC_FORBIDDEN);
+            return;
+        }
+
+        File crtFile = new File(Jenkins.get().getRootDir(),
+                "/war/WEB-INF/update-center-rootCAs/" + CRT);
+        if(crtFile.isFile()) {
+            crtFile.delete();
+        }
+        response.sendRedirect(Jenkins.get().getRootUrl() + "/chinese");
+    }
+
+    @CheckForNull
+    @Override
+    public String getIconFileName() {
+        return null;
+    }
+
+    @CheckForNull
+    @Override
+    public String getDisplayName() {
+        return "Use mirror of update center";
+    }
+
+    @CheckForNull
+    @Override
+    public String getUrlName() {
+        return "/update-center-mirror";
+    }
+}

src/main/resources/io/jenkins/plugins/localization_zh_cn/CommunityPage/index.jelly

@@ -15,6 +15,20 @@
         <li>版本更新发布</li>
         <img width="300px" height="300px" src="${rootURL}/plugin/localization-zh-cn/images/jenkins-wechat.png" alt="Jenkins 微信公众号二维码"/>
       </div>
+
+      <h2>更新中心镜像设置</h2>
+
+      修改更新中心的地址为
+      https://jenkins-zh.gitee.io/update-center-mirror/tsinghua/update-center.json
+
+      <f:form method="post" action="/update-center-mirror/use">
+        <f:submit name="reload" value="使用"/>
+      </f:form>
+      <f:form method="post" action="/update-center-mirror/remove">
+        <f:submit name="reload" value="移除"/>
+      </f:form>
+
+      <a href="${rootURL}/pluginManager/advanced">设置更新中心地址</a>
     </l:main-panel>
   </l:layout>
 </j:jelly>
\ No newline at end of file

src/main/resources/mirror-adapter.crt

+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----