Upload file to slack using the slack files.upload API.

upload_to_slack.py

import requests
from decouple import (
    config,
)  # decouple is a library that allows you to store your secrets in a .env file

SLACK_FILE_UPLOAD_URL = "https://slack.com/api/files.upload"


def upload_file_to_slack(file_path) -> dict:
    """Uploads a file to slack using the slack api
    Read more about the slack api here: https://api.slack.com/methods/files.upload

    Args:
        file_path (str): The path to the file you want to upload

    Returns:
        dict: The 'file' response from the slack API.
    """

    payload = {
        "filename": "filename.html",
        "filetype": "html",
        "initial_comment": "Initial comment",
        "title": "File title",
        "channels": "Comma, separated, list, of, channels",  # Optional
    }
    files = {"file": (file_path, open(file_path, "rb"), "html")}
    bot_token = config(
        "SLACK_BOT_TOKEN"
    )  # value from https://api.slack.com/apps/<APP_ID>/oauth
    headers = {"Authorization": f"Bearer {bot_token}"}

    response = requests.request(
        "POST",
        SLACK_FILE_UPLOAD_URL,
        headers=headers,
        data=payload,
        files=files,
    )
    try:
        return response.json().get("file")
    except Exception as e:
        return {"error": str(e), "status_code": response.status_code}


if __name__ == "__main__":
    file_path = "path/to/file.html"
    print(upload_file_to_slack(file_path))