refactor: add input length guards for add/edit/import flows

SubMind.py

@@ -252,6 +252,9 @@ EDITABLE_SUB_FIELDS = {
     'renewal_type': 'renewal_type',
     'notes': 'notes'
 }
+MAX_NAME_LEN = 128
+MAX_CATEGORY_LEN = 64
+MAX_NOTES_LEN = 1000
 
 
 def _build_category_callback_data(category_id: int) -> str:
@@ -553,12 +556,18 @@ async def import_upload_received(update: Update, context: CallbackContext):
                 if renewal_type not in valid_renewal_types:
                     raise ValueError(f"无效续费类型: {renewal_type}")
                 notes = str(row['notes']).strip() if pd.notna(row['notes']) else None
+                if notes and len(notes) > MAX_NOTES_LEN:
+                    raise ValueError(f"备注过长（>{MAX_NOTES_LEN}）")
                 name = str(row['name']).strip()
                 category = str(row['category']).strip()
                 if not name:
                     raise ValueError("名称不能为空")
                 if not category:
                     raise ValueError("类别不能为空")
+                if len(name) > MAX_NAME_LEN:
+                    raise ValueError(f"名称过长（>{MAX_NAME_LEN}）")
+                if len(category) > MAX_CATEGORY_LEN:
+                    raise ValueError(f"类别过长（>{MAX_CATEGORY_LEN}）")
                 records.append((
                     user_id, name, cost, currency, category,
                     next_due, frequency_unit, frequency_value, renewal_type, notes
@@ -601,6 +610,9 @@ async def add_name_received(update: Update, context: CallbackContext):
     if not name:
         await update.message.reply_text("订阅名称不能为空。")
         return ADD_NAME
+    if len(name) > MAX_NAME_LEN:
+        await update.message.reply_text(f"订阅名称过长，请控制在 {MAX_NAME_LEN} 个字符以内。")
+        return ADD_NAME
     context.user_data['new_sub_data']['name'] = name
     await update.message.reply_text("第二步：请输入订阅 *费用*", parse_mode='MarkdownV2')
     return ADD_COST
@@ -634,6 +646,9 @@ async def add_category_received(update: Update, context: CallbackContext):
     if not category_name:
         await update.message.reply_text("类别不能为空。")
         return ADD_CATEGORY
+    if len(category_name) > MAX_CATEGORY_LEN:
+        await update.message.reply_text(f"类别名称过长，请控制在 {MAX_CATEGORY_LEN} 个字符以内。")
+        return ADD_CATEGORY
     context.user_data['new_sub_data']['category'] = category_name
     with get_db_connection() as conn:
         cursor = conn.cursor()
@@ -701,6 +716,9 @@ async def add_notes_received(update: Update, context: CallbackContext):
         await update.message.reply_text("发生错误，请重试。")
         return ConversationHandler.END
     note = update.message.text.strip()
+    if len(note) > MAX_NOTES_LEN:
+        await update.message.reply_text(f"备注过长，请控制在 {MAX_NOTES_LEN} 个字符以内。")
+        return ADD_NOTES
     sub_data['notes'] = note if note else None
     save_subscription(update.effective_user.id, sub_data)
     await update.message.reply_text(text=f"✅ 订阅 '{escape_markdown(sub_data.get('name', ''), version=2)}' 已添加！",
@@ -1170,6 +1188,10 @@ async def edit_new_value_received(update: Update, context: CallbackContext):
             if message_to_reply:
                 await message_to_reply.reply_text("类别不能为空。")
             validation_failed = True
+        elif len(new_value) > MAX_CATEGORY_LEN:
+            if message_to_reply:
+                await message_to_reply.reply_text(f"类别名称过长，请控制在 {MAX_CATEGORY_LEN} 个字符以内。")
+            validation_failed = True
         else:
             with get_db_connection() as conn:
                 cursor = conn.cursor()