add send articles message builder

common/src/main/java/cn/wildfirechat/messagecontentbuilder/ArticlesContentBuilder.java

@@ -0,0 +1,83 @@
+package cn.wildfirechat.messagecontentbuilder;
+
+import cn.wildfirechat.pojos.MessagePayload;
+import cn.wildfirechat.proto.ProtoConstants;
+import io.netty.util.internal.StringUtil;
+import org.json.simple.JSONArray;
+import org.json.simple.JSONObject;
+
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Base64;
+import java.util.List;
+import java.util.function.Consumer;
+
+public class ArticlesContentBuilder extends MessageContentBuilder{
+    public static class Article {
+        public String id;
+        public String cover;
+        public String title;
+        public String url;
+        public boolean readReport;
+    }
+    public Article topArticle;
+    public List<Article> subArticles;
+
+    public static ArticlesContentBuilder newBuilder(String id, String cover, String title, String url, boolean readReport) {
+        ArticlesContentBuilder builder = new ArticlesContentBuilder();
+        builder.topArticle = new Article();
+        builder.topArticle.id = id;
+        builder.topArticle.cover = cover;
+        builder.topArticle.title = title;
+        builder.topArticle.url = url;
+        builder.topArticle.readReport = readReport;
+        return builder;
+    }
+
+    public ArticlesContentBuilder addSubArticle(String id, String cover, String title, String url, boolean readReport) {
+        Article article = new Article();
+        article.id = id;
+        article.cover = cover;
+        article.title = title;
+        article.url = url;
+        article.readReport = readReport;
+        if(subArticles == null) {
+            subArticles = new ArrayList<>();
+        }
+        subArticles.add(article);
+        return this;
+    }
+
+    private static JSONObject toJSON(Article article) {
+        JSONObject top = new JSONObject();
+        if(!StringUtil.isNullOrEmpty(article.id))
+            top.put("id", article.id);
+        if(!StringUtil.isNullOrEmpty(article.cover))
+            top.put("cover", article.cover);
+        if(!StringUtil.isNullOrEmpty(article.title))
+            top.put("title", article.title);
+        if(!StringUtil.isNullOrEmpty(article.url))
+            top.put("url", article.url);
+        if(article.readReport)
+            top.put("rr", article.readReport);
+        return top;
+    }
+
+    @Override
+    public MessagePayload build() {
+        MessagePayload payload = encodeBase();
+        payload.setType(ProtoConstants.ContentType.Articles);
+        payload.setPersistFlag(ProtoConstants.PersistFlag.Persist_And_Count);
+        payload.setSearchableContent(topArticle.title);
+        JSONObject jsonObject = new JSONObject();
+        jsonObject.put("top", toJSON(topArticle));
+        if(subArticles != null && !subArticles.isEmpty()) {
+            JSONArray jsonArray = new JSONArray();
+            subArticles.forEach(article -> jsonArray.add(toJSON(article)));
+            jsonObject.put("subArticles", jsonArray);
+        }
+
+        payload.setBase64edData(Base64.getEncoder().encodeToString(jsonObject.toJSONString().getBytes(StandardCharsets.UTF_8)));
+        return payload;
+    }
+}

common/src/main/java/cn/wildfirechat/proto/ProtoConstants.java

@@ -89,6 +89,7 @@ public interface ContentType {
         int Name_Card = 10;
         int Composited = 11;
         int Rich_Notification = 12;
+        int Articles = 13;
         int Enter_Channel_Chat = 71;
         int Leave_Channel_Chat = 72;
         int Recall = 80;