Added inline query handler, updated CHANGELOG, added group name validator

src/bot/handler/inlineQueryHandler.py

@@ -0,0 +1,46 @@
+from bot.handler.abstractHandler import AbstractHandler
+from entity.group import Group
+from telegram import InlineQueryResultArticle
+from telegram.ext.callbackcontext import CallbackContext
+from telegram.ext.commandhandler import CommandHandler
+from telegram.ext.inlinequeryhandler import \
+    InlineQueryHandler as CoreInlineQueryHandler
+from telegram.inline.inputtextmessagecontent import InputTextMessageContent
+from telegram.update import Update
+
+
+class InlineQueryHandler(AbstractHandler):
+    bot_handler: CommandHandler
+
+    def __init__(self) -> None:
+        self.bot_handler = CoreInlineQueryHandler(self.handle)
+
+    def handle(self, update: Update, context: CallbackContext) -> None:
+        group_display = update.inline_query.query or Group.default_name
+        group = '' if group_display == Group.default_name else group_display
+
+        results = [
+            InlineQueryResultArticle(
+                id='everyone',
+                title='MENTION',
+                description=f'Mention members in group "{group_display}"',
+                input_message_content=InputTextMessageContent(f'/everyone {group}')
+            ),
+            InlineQueryResultArticle(
+                id='join',
+                title='JOIN',
+                description=f'Joins group "{group_display}"',
+                input_message_content=InputTextMessageContent(f'/join {group}')
+            ),
+            InlineQueryResultArticle(
+                id='leave',
+                title='LEAVE',
+                description=f'Leaves group "{group_display}"',
+                input_message_content=InputTextMessageContent(f'/leave {group}')
+            )
+        ]
+
+        update.inline_query.answer(results, cache_time=4800)
+
+    def get_bot_handler(self) -> CoreInlineQueryHandler:
+        return self.bot_handler