bot to save a pdf uploaded by the user to host computer

Hello. I would like to create a bot that can read in an uploaded file (pdf) uploaded by the user and save it to a server (for now on the host computer). I am thinking the files.info method might work, but I am not sure how to get to the specific file. Could you post an example of how to do this?

import os
from slack_bolt import App

app = App(
    token= os.environ.get('SLACK_BOT_TOKEN'),
    signing_secret=os.environ.get("SLACK_SIGNING_SECRET")
)


# # # LISTENING FUNCTIONS # # # 
# This will matc h any message that contains "Hi!"
@app.message("Hi!")
def initial_message_func(message, say):
	say("please upload your pdf")


@app.message("")
def message_to_sam_func(client,message):
    client.file.info(file = file_ID)    #not sure how to get file_ID
                                        

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[mae5357]

Thank you for the help. Posted final code in case others had issues

@app.event("file_shared")
def file_func(payload, client, ack):
    ack()

    #get the file id every time someone uploads a pdf
    my_file = payload.get('file').get('id')
    
    #get the json using files_info
    url = client.files_info(file = my_file).get('file').get('url_private')
    file_name = client.files_info(file = my_file).get('file').get('title')

    # save file
    resp = requests.get(url, headers={'Authorization': 'Bearer %s' % token})
    save_file = Path(file_name)
    save_file.write_bytes(resp.content)

[mauriciogracia]

In case you need your slack bot to recieve a file shared by DM here a starting point

@app.event("message")
def handle_message_events(body, logger):
    # Unhandled request({'type': 'event_callback', 'event': {'type': 'message', 'subtype': 'file_share'}})
    logging.warning(body)

You need ngrok to be running (when in development mode) and you need to enable Event Subscriptions and configure it with the URL that ngrok generates automatically.

Keep in mind that if you restart ngrok a new URL will be generated

If you want a stable URL you need to pay for ngrok or set another type of forwarding - https://ngrok.com/docs