Add deprecation warnings to Bot properties

Three properties of the Bot class - parse_mode, disable_web_page_preview, and protect_content - have been marked as deprecated with proper warning messages. The associated tests have also been added to confirm the working of these deprecation warnings. Users are advised to use the updated alternatives specified in the warning messages.

aiogram/client/bot.py

@@ -297,6 +297,36 @@ class Bot:
         self.__token = token
         self._me: Optional[User] = None
 
+    @property
+    def parse_mode(self) -> Optional[str]:
+        warnings.warn(
+            "Accessing `parse_mode` from Bot instance is deprecated. This attribute will be removed in 3.5.0 version\n"
+            "Use `bot.default.parse_mode` instead.",
+            category=DeprecationWarning,
+            stacklevel=2,
+        )
+        return self.default.parse_mode
+
+    @property
+    def disable_web_page_preview(self) -> Optional[bool]:
+        warnings.warn(
+            "Accessing `disable_web_page_preview` from Bot instance is deprecated. This attribute will be removed in 3.5.0 version\n"
+            "Use `bot.default.link_preview_is_disabled` instead.",
+            category=DeprecationWarning,
+            stacklevel=2,
+        )
+        return self.default.link_preview_is_disabled
+
+    @property
+    def protect_content(self) -> Optional[bool]:
+        warnings.warn(
+            "Accessing `protect_content` from Bot instance is deprecated. This attribute will be removed in 3.5.0 version\n"
+            "Use `bot.default.protect_content` instead.",
+            category=DeprecationWarning,
+            stacklevel=2,
+        )
+        return self.default.protect_content
+
     @property
     def token(self) -> str:
         return self.__token

tests/test_api/test_client/test_bot.py

@@ -49,6 +49,30 @@ class TestBot:
         ):
             bot = Bot(token="42:Test", parse_mode="HTML")
 
+    def test_deprecated_parse_mode(self):
+        with check_deprecated(
+            max_version="3.5.0",
+            exception=AttributeError,
+        ):
+            bot = Bot(token="42:Test", parse_mode="HTML")
+            assert bot.parse_mode == "HTML"
+
+    def test_disable_web_page_preview(self):
+        with check_deprecated(
+            max_version="3.5.0",
+            exception=TypeError,
+        ):
+            bot = Bot(token="42:Test", disable_web_page_preview=True)
+            assert bot.disable_web_page_preview is True
+
+    def test_deprecated_protect_content(self):
+        with check_deprecated(
+            max_version="3.5.0",
+            exception=AttributeError,
+        ):
+            bot = Bot(token="42:Test", protect_content=True)
+            assert bot.protect_content is True
+
     def test_hashable(self):
         bot = Bot("42:TEST")
         assert hash(bot) == hash("42:TEST")