Support to setting community link for a user

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

@@ -2,6 +2,7 @@ package io.jenkins.plugins.localization_zh_cn;
 
 import hudson.Extension;
 import hudson.model.PageDecorator;
+import hudson.model.User;
 import org.kohsuke.stapler.Stapler;
 import org.kohsuke.stapler.StaplerRequest;
 
@@ -23,4 +24,31 @@ public class CommunityDecorator extends PageDecorator {
 
         return false;
     }
+
+    public boolean showCommunityLink() {
+        boolean isCurrentLanguage = isCurrentLanguage();
+        User user = User.current();
+        if(user == null) {
+            return isCurrentLanguage;
+        }
+
+        UserCommunityProperty communityProperty = user.getProperty(UserCommunityProperty.class);
+        if(communityProperty == null) {
+            return isCurrentLanguage;
+        }
+
+        String conditionName = communityProperty.getShowCondition();
+        UserCommunityProperty.ShowConditions condition =
+                UserCommunityProperty.ShowConditions.valueOf(conditionName);
+        switch (condition) {
+            case Always:
+                return true;
+            case Never:
+                return false;
+            case Chinese:
+                return isCurrentLanguage;
+        }
+
+        return isCurrentLanguage;
+    }
 }

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

+package io.jenkins.plugins.localization_zh_cn;
+
+import hudson.Extension;
+import hudson.model.User;
+import hudson.model.UserProperty;
+import hudson.model.UserPropertyDescriptor;
+import org.kohsuke.stapler.DataBoundConstructor;
+import org.kohsuke.stapler.DataBoundSetter;
+
+import javax.annotation.Nonnull;
+
+public class UserCommunityProperty extends UserProperty {
+    private String showCondition;
+
+    @DataBoundConstructor
+    public UserCommunityProperty(){}
+
+    public String getShowCondition() {
+        return showCondition;
+    }
+
+    @DataBoundSetter
+    public void setShowCondition(String showCondition) {
+        this.showCondition = showCondition;
+    }
+
+    @Extension
+    public static final class DescriptorImpl extends UserPropertyDescriptor {
+
+        @Override
+        public UserProperty newInstance(User user) {
+            return new UserCommunityProperty();
+        }
+
+        @Nonnull
+        @Override
+        public String getDisplayName() {
+            return "Chinese Community";
+        }
+    }
+
+    public ShowConditions[] getAllConditions() {
+        return ShowConditions.values();
+    }
+
+    public String getConditionDisplay(ShowConditions conditions) {
+        return conditions.getDisplay();
+    }
+
+    enum ShowConditions {
+        Chinese("Only in Chinese"), Always("Always"), Never("Never");
+        private String display;
+        ShowConditions(String display) {
+            this.display = display;
+        }
+
+        public String getDisplay() {
+            return display;
+        }
+    }
+}

src/main/resources/io/jenkins/plugins/localization_zh_cn/CommunityDecorator/footer.jelly

 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:f="/lib/form" xmlns:st="jelly:stapler">
-    <j:if test="${it.isCurrentLanguage()}">
+    <j:if test="${it.showCommunityLink()}">
         <span>
           <a href="${rootURL}/chinese">Jenkins 中文社区</a>
         </span>

src/main/resources/io/jenkins/plugins/localization_zh_cn/UserCommunityProperty/config.jelly

+<?jelly escape-by-default='true'?>
+<j:jelly xmlns:j="jelly:core" xmlns:f="/lib/form">
+  <f:entry title="${%Community Link}" field="showCondition">
+    <select name="showCondition">
+        <j:forEach var="condition" items="${instance.getAllConditions()}">
+            <j:choose>
+               <j:when test="${condition.name() == instance.showCondition}">
+                 <option value="${condition.name()}" selected="true">${instance.getConditionDisplay(condition)}</option>
+               </j:when>
+               <j:otherwise>
+                 <option value="${condition.name()}">${instance.getConditionDisplay(condition)}</option>
+               </j:otherwise>
+            </j:choose>
+        </j:forEach>
+    </select>
+  </f:entry>
+</j:jelly>