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Identifying DIRECT_MESSAGE, CHANNEL_MESSAGE, & GROUP_MESSAGE in Slack API Event

A simply way to determine if a message is a DM or not; if a channel ID begins with a:

• C, it's a public channel
• D, it's a DM with the user
• G, it's either a private channel or multi-person DM

However, these values aren't set in stone and could change at some point, or be added to.

So if that syntax goes away, another way to detect a DM to use both channels.info and groups.info. If they both return “false” for the “ok” field, then you know it’s a DM.

Note:

• channels.info is for public channels only
• groups.info is for private channels and multi-person DMs only

Bonus info: Once you detect a that a message is a DM, use either the user ID or channel ID and search for it in the results of im.list; if you find it, then you’ll know it’s a DM to the bot.

• “id” from im.list is the channel ID
• “user” from im.list is the user ID from the person DM’ing with the bot
• You don’t pass in the bot’s user ID, because it’s extracted from the token

Note :
Private channel is 'W

Source :
https://stackoverflow.com/questions/41111227/how-can-a-slack-bot-detect-a-direct-message-vs-a-message-in-a-channel

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