broadcast.py

from slack.signature import SignatureVerifier
signature_verifier = SignatureVerifier(os.environ["SLACK_SIGNING_SECRET"])

from flask import Flask, request, make_response
app = Flask(__name__)

@app.route("/slack/events", methods=["POST"])
def slack_app():
  if not signature_verifier.is_valid_request(request.get_data(), request.headers):
    return make_response("invalid request", 403)

  if "payload" in request.form:
    payload = json.loads(request.form["payload"])

    if payload["type"] == "shortcut" \
      and payload["callback_id"] == "open-modal-shortcut":
      # Open a new modal by a global shortcut
      try:
        api_response = client.views_open(
          trigger_id=payload["trigger_id"],
          view={
            "type": "modal",
            "callback_id": "modal-id",
            "title": {
              "type": "plain_text",
              "text": "Awesome Modal"
            },
            "submit": {
              "type": "plain_text",
              "text": "Submit"
            },
            "close": {
              "type": "plain_text",
              "text": "Cancel"
            },
            "blocks": [
              {
                "type": "input",
                "block_id": "b-id",
                "label": {
                  "type": "plain_text",
                  "text": "Input label",
                },
                "element": {
                  "action_id": "a-id",
                  "type": "plain_text_input",
                }
              }
            ]
          }
        )
        return make_response("", 200)
      except SlackApiError as e:
        code = e.response["error"]
        return make_response(f"Failed to open a modal due to {code}", 200)

    if payload["type"] == "view_submission" \
      and payload["view"]["callback_id"] == "modal-id":
      # Handle a data submission request from the modal
      submitted_data = payload["view"]["state"]["values"]
      print(submitted_data)  # {'b-id': {'a-id': {'type': 'plain_text_input', 'value': 'your input'}}}
      return make_response("", 200)

  return make_response("", 404)

if __name__ == "__main__":
  app.run("localhost", 3000)