Add "Forbidden: bot is not a member of the channel chat" exception

[karb0f0s]

From @tuscen on March 14, 2018 18:59

HTTP code: 403
Error message: Forbidden: bot is not a member of the channel chat

Copied from original issue: TelegramBots/Telegram.Bot#648

[karb0f0s]

How do you get this? Send message to some public channel when you are not its member?

[karb0f0s]

From @tuscen on April 2, 2018 10:23

Either public or private, doesn't matter.

[karb0f0s]

I was able to test this exception in supergroup and channel, it is not thrown for regular group - ChatNotFoundException is thrown instead

[karb0f0s]

Add BotIsNotMemberException

[karb0f0s]

anyone can think of better a name?

[karb0f0s]

From @tuscen on April 4, 2018 13:56

It should somehow include word "channel" because it is thrown only for channels.

[karb0f0s]

From @pouladpld on April 4, 2018 14:12

If such errors happen for other chats, we could use general base and derived subclasses.

[karb0f0s]

@tuscen actually it is not true. I have test cases for both channel and supergroup: "bot is not a member of the (supergroup|channel) chat". It is possible to make two different exceptions, but I think it's too much

[karb0f0s]

From @tuscen on April 4, 2018 14:27

@karb0f0s yeah, makes sense to have single type if it can be thrown with slightly different error message for other chats.