Add new message types for automod (#2116)

Fixes parsing errors on retrieve message methods

src/main/java/net/dv8tion/jda/api/entities/EmbedType.java

@@ -28,6 +28,7 @@ public enum EmbedType
     VIDEO("video"),
     LINK("link"),
     RICH("rich"),
+    AUTO_MODERATION("auto_moderation_message"),
     UNKNOWN("");
 
     private final String key;

src/main/java/net/dv8tion/jda/api/entities/Message.java

@@ -1394,6 +1394,7 @@ default MessageAction reply(@Nonnull byte[] data, @Nonnull String name, @Nonnull
      *              <li>If this Message was not sent by the currently logged in account and it was <b>not</b> sent in a
      *              {@link GuildChannel GuildChannel}.</li>
      *              <li>If this Message is ephemeral</li>
+     *              <li>If this message type cannot be deleted. (See {@link MessageType#canDelete()})</li>
      *         </ul>
      *
      * @return {@link net.dv8tion.jda.api.requests.restaction.AuditableRestAction AuditableRestAction}

src/main/java/net/dv8tion/jda/api/entities/MessageChannel.java

@@ -207,6 +207,8 @@ default List<CompletableFuture<Void>> purgeMessages(@Nonnull Message... messages
      * to delete all messages provided. No checks will be done to prevent failures, use {@link java.util.concurrent.CompletionStage#exceptionally(Function)}
      * to handle failures.
      *
+     * <p>Any messages that cannot be deleted, as suggested by {@link MessageType#canDelete()}, will be filtered out before making any requests.
+     *
      * <p>For possible ErrorResponses see {@link #purgeMessagesById(long...)}.
      *
      * @param  messages
@@ -226,10 +228,10 @@ default List<CompletableFuture<Void>> purgeMessages(@Nonnull List<? extends Mess
     {
         if (messages == null || messages.isEmpty())
             return Collections.emptyList();
-        long[] ids = new long[messages.size()];
-        for (int i = 0; i < ids.length; i++)
-            ids[i] = messages.get(i).getIdLong();
-        return purgeMessagesById(ids);
+        return purgeMessagesById(messages.stream()
+                .filter(m -> m.getType().canDelete())
+                .mapToLong(Message::getIdLong)
+                .toArray());
     }
 
     /**

src/main/java/net/dv8tion/jda/api/entities/MessageType.java

@@ -143,6 +143,13 @@ public enum MessageType
      */
     CONTEXT_COMMAND(23, false),
 
+    /**
+     * This message was created by the automod system.
+     *
+     * Messages from this type usually come with custom embeds containing relevant information, the author is the user that triggered the filter.
+     */
+    AUTO_MODERATION_ACTION(24),
+
     /**
      * Unknown MessageType.
      */
@@ -184,6 +191,17 @@ public boolean isSystem()
         return system;
     }
 
+    /**
+     * Whether messages of this type can be deleted.
+     * <br>Currently the only type that cannot be deleted is {@link #AUTO_MODERATION_ACTION}.
+     *
+     * @return True, if delete is supported
+     */
+    public boolean canDelete()
+    {
+        return this != AUTO_MODERATION_ACTION;
+    }
+
     /**
      * Used to retrieve a MessageType based on the Discord id key.
      * <br>If the {@code id} provided is not a known id, {@link #UNKNOWN} is returned

src/main/java/net/dv8tion/jda/internal/entities/ReceivedMessage.java

@@ -640,6 +640,8 @@ public AuditableRestAction<Void> delete()
             else if (!sMember.hasPermission(gChan, Permission.MESSAGE_MANAGE))
                 throw new InsufficientPermissionException(gChan, Permission.MESSAGE_MANAGE);
         }
+        if (!type.canDelete())
+            throw new IllegalStateException("Cannot delete messages of type " + type);
         return channel.deleteMessageById(getIdLong());
     }