Slack OAuth2 integration

This is simple FastAPI that integrates Slack's OAuth2 for user authentication and authorization

How to run development

Rename the .env.sample file to .env and add slack app client_id and client_secret
Create and activate virtualenv and run pip install requirements.dev.txt or Run poetry init and poetry install --with dev
Run docker-compose up -d --build

Slack only allows https redirects for it's OAuth redirect endpoint In testing the application ngrok was used.

Authorize endpoint {BASE_URL}/slack/oauth builds and return slack authorization url using the client_secret, client_id and the necessary scopes
Copy and past the url into a browser to authorize the app. This will call the post_authorize endpoint and returns acces_token, id_token and other information about the authorized user
Get users page endpoint {BASE_URL}/users return a paginated list of users
Get app_per_users {BASE_URL}/users/apps was partially implemented
Run enpoint {BASE_URL}/run returns aggregated results from get_app_per_user and get_users page
Verify endpoint {BASE_URL}/verify To test the verify endpoint, pass the access_token as an authorization header to the endpoint.