[3.x] Bot API 6.0 (#890)

* Base implementation

* Bump license

* Revert re-generated tests

* Fix tests, improved docs

* Remove TODO

* Removed unreachable code

* Changed type of `last_synchronization_error_date`

* Fixed wrongly cleaned code

examples/web_app/routes.py

@@ -0,0 +1,64 @@
+from pathlib import Path
+
+from aiohttp.web_fileresponse import FileResponse
+from aiohttp.web_request import Request
+from aiohttp.web_response import json_response
+
+from aiogram import Bot
+from aiogram.types import (
+    InlineKeyboardButton,
+    InlineKeyboardMarkup,
+    InlineQueryResultArticle,
+    InputTextMessageContent,
+    WebAppInfo,
+)
+from aiogram.utils.web_app import check_webapp_signature, safe_parse_webapp_init_data
+
+
+async def demo_handler(request: Request):
+    return FileResponse(Path(__file__).parent.resolve() / "demo.html")
+
+
+async def check_data_handler(request: Request):
+    bot: Bot = request.app["bot"]
+
+    data = await request.post()
+    if check_webapp_signature(bot.token, data["_auth"]):
+        return json_response({"ok": True})
+    return json_response({"ok": False, "err": "Unauthorized"}, status=401)
+
+
+async def send_message_handler(request: Request):
+    bot: Bot = request.app["bot"]
+    data = await request.post()
+    try:
+        web_app_init_data = safe_parse_webapp_init_data(token=bot.token, init_data=data["_auth"])
+    except ValueError:
+        return json_response({"ok": False, "err": "Unauthorized"}, status=401)
+
+    print(data)
+    reply_markup = None
+    if data["with_webview"] == "1":
+        reply_markup = InlineKeyboardMarkup(
+            inline_keyboard=[
+                [
+                    InlineKeyboardButton(
+                        text="Open",
+                        web_app=WebAppInfo(url=str(request.url.with_scheme("https"))),
+                    )
+                ]
+            ]
+        )
+    await bot.answer_web_app_query(
+        web_app_query_id=web_app_init_data.query_id,
+        result=InlineQueryResultArticle(
+            id=web_app_init_data.query_id,
+            title="Demo",
+            input_message_content=InputTextMessageContent(
+                message_text="Hello, World!",
+                parse_mode=None,
+            ),
+            reply_markup=reply_markup,
+        ),
+    )
+    return json_response({"ok": True})