fix: Message.getCommand() might return null if text of MessageEntity objects is not computed yet (#1602)

* fix(richtext): serialize RichTextPlain as a bare JSON string

The Bot API defines RichText as "either a String for plain text, an Array
of RichText, or any of the following types" - there is no "plain" type on
the wire. RichTextPlain exists only to give plain text a place in the Java
RichText hierarchy.

RichTextDeserializer already mapped a bare JSON string to RichTextPlain on
the way in, but nothing handled the way out: RichTextPlain had no custom
serializer, so Jackson wrote it as {"type":"plain","text":...}. Telegram
rejected such payloads with:

    Bad Request: Can't parse PageBlockTableCell: Unsupported rich text type

Add RichTextPlainSerializer, mirroring the existing RichTextConcatSerializer
for the other library-only pseudo-type. It writes the bare string and
overrides serializeWithType so the @JsonTypeInfo machinery on the RichText
interface cannot re-wrap it in a type envelope.

Reading {"type":"plain",...} keeps working, so JSON persisted by the old
serializer still deserializes.

Fixes #1599

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

* Bug fixing v10.2.1

* fix: compute text of MessageEntity objects on Message.getCommand()

---------

Co-authored-by: ruben <rberlopez@gmail.com>
Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-authored-by: Ruben Bermudez <rubenlagus@users.noreply.github.com>

Author: 3 people

telegrambots-meta/src/main/java/org/telegram/telegrambots/meta/api/objects/MessageEntity.java

@@ -127,6 +127,9 @@ public class MessageEntity implements BotApiObject {
 
     public void computeText(String message) {
         if (message != null) {
+            if (text != null) {
+                return;
+            }
             text = message.substring(offset, offset + length);
         }
     }

telegrambots-meta/src/main/java/org/telegram/telegrambots/meta/api/objects/message/Message.java

@@ -1098,7 +1098,7 @@ public boolean isCommand() {
     @JsonIgnore
     public String getCommand() {
         if (hasText() && hasEntities()) {
-            for (var entity : entities) {
+            for (var entity : getEntities()) {
                 if (entity != null && NumberUtils.INTEGER_ZERO.equals(entity.getOffset())) {
                     if (EntityType.BOTCOMMAND.equals(entity.getType())) {
                         return entity.getText();

telegrambots-meta/src/test/java/org/telegram/telegrambots/meta/test/TelegramBotsHelper.java

@@ -196,4 +196,8 @@ public static String GetSetGameScoreBooleanResponse() {
     public static String GetSetGameScoreMessageResponse() {
         return "{\"ok\": true,\"result\": {\"date\": 1441645532,\"chat\": {\"last_name\": \"Test Lastname\",\"id\": 1111111,\"type\": \"private\",\"first_name\": \"Test Firstname\",\"username\": \"Testusername\"},\"message_id\": 1365,\"from\": {\"last_name\": \"Test Lastname\",\"id\": 1111111,\"first_name\": \"Test Firstname\",\"username\": \"Testusername\",\"is_bot\": false},\"text\": \"Original\"}}";
     }
+
+    public static String GetCommandMessage() {
+        return "{\"message_id\": 1, \"date\": 1, \"text\": \"/debug\", \"entities\": [{\"type\": \"bot_command\", \"offset\": 0, \"length\": 6}]}";
+    }
 }

telegrambots-meta/src/test/java/org/telegram/telegrambots/meta/test/TestDeserialization.java

@@ -458,6 +458,12 @@ void TestUpdateDeserialization() throws Exception {
         assertUpdate(update);
     }
 
+    @Test
+    void TestMessageEntityTextComputedOnDeserialization() throws Exception {
+        Message message = mapper.readValue(TelegramBotsHelper.GetCommandMessage(), Message.class);
+        assertNotNull(message.getCommand());
+    }
+
     @Test
     void TestUpdateDeserializationWithInlineKeyboard() throws Exception {
         Update update = mapper.readValue(TelegramBotsHelper.GetUpdateWithMessageInCallbackQuery(), Update.class);
@@ -631,4 +637,4 @@ private void assertChannelChat(Chat chat) {
         assertTrue(chat.isChannelChat());
         assertEquals("Test channel", chat.getTitle());
     }
-}
+}