From 7cefe2d82530d4d2d9f05c8eccd89d2e3558a16e Mon Sep 17 00:00:00 2001
From: lanvent <lanvent@qq.com>
Date: Fri, 21 Apr 2023 21:03:38 +0800
Subject: [PATCH] fix: split long text messages into multiple parts in
 wechatmp_service

---
 channel/wechatmp/common.py           | 2 +-
 channel/wechatmp/wechatmp_channel.py | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/channel/wechatmp/common.py b/channel/wechatmp/common.py
index 5481eae..712c5f3 100644
--- a/channel/wechatmp/common.py
+++ b/channel/wechatmp/common.py
@@ -51,7 +51,7 @@ def split_string_by_utf8_length(string, max_length, max_split=0):
         if max_split > 0 and len(result) >= max_split:
             result.append(encoded[start:].decode("utf-8"))
             break
-        end = start + max_length
+        end = min(start + max_length, len(encoded))
         # 如果当前字节不是 UTF-8 编码的开始字节，则向前查找直到找到开始字节为止
         while end < len(encoded) and (encoded[end] & 0b11000000) == 0b10000000:
             end -= 1
diff --git a/channel/wechatmp/wechatmp_channel.py b/channel/wechatmp/wechatmp_channel.py
index 1768475..e59cd7e 100644
--- a/channel/wechatmp/wechatmp_channel.py
+++ b/channel/wechatmp/wechatmp_channel.py
@@ -130,7 +130,11 @@ class WechatMPChannel(ChatChannel):
         else:
             if reply.type == ReplyType.TEXT or reply.type == ReplyType.INFO or reply.type == ReplyType.ERROR:
                 reply_text = reply.content
-                self.client.message.send_text(receiver, reply_text)
+                texts = split_string_by_utf8_length(reply_text, MAX_UTF8_LEN)
+                if len(texts)>1:
+                    logger.info("[wechatmp] text too long, split into {} parts".format(len(texts)))
+                for text in texts:
+                    self.client.message.send_text(receiver, text)
                 logger.info("[wechatmp] Do send text to {}: {}".format(receiver, reply_text))
             elif reply.type == ReplyType.VOICE:
                 try: