Slack bot permission to post on any channel by any user

Question

I have created a slash command on Slack and it works fine if I execute it on any channel. I can't figure out if there is a permission through which any user can post on any channel using the slash command.

Is there a way where any user can post anywhere in the channel ?

Basically I want to pass * to Post to option so that they are not restricted to a private slackbot group only.

EDITED:

Answer 1

Your app does not need any additional permissions for replying to the slash command of a user in any channel.

There are two ways on how to post into a channel as response to a slash command executed by a user:

• Directly respond to the slash request within 3 seconds. e.g. if you are using Flask you are responding to a request by calling return in your @route function

• Send a request to the request_url which you find the slash command request within 30 seconds

The "Post To" property you are showing has nothing to do with slash commands. It's for incoming-webhooks, which is used by non Slack apps to send message to Slack.

Code

Here is an example for both types of response using Flask:

from flask import Flask, json, request
import requests

app = Flask(__name__) #create the Flask app

@app.route('/slash', methods=['POST'])
def slash_response_direct():                
    """Direct response"""
    message = {        
        "text": "Hi there"
    }
    return json.jsonify(message)


#@app.route('/slash', methods=['POST'])
def slash_response_indirect():
    """responding to slash command via response URL"""

    response_url = request.form["response_url"]    
    message = {        
        "text": "Hi"
    }
    res = requests.post(response_url, json=message)

    return ""


if __name__ == '__main__':
    app.run(debug=True, port=8000) #run app in debug mode on port 8000