ngnix.conf

server {
    listen 80;

    # Load environment variables from a file created on container start (it might be empty)
    include "/GH_OAUTH_CLIENT.conf";  # This file may be empty or missing values

    # Default to empty strings if CLIENT_ID or CLIENT_SECRET are not set
    set $client_id "";
    set $client_secret "";

    # Check if environment variables were set, otherwise default to empty
    if ($CLIENT_ID) {
        set $client_id "client_id=${CLIENT_ID}";
    }
    if ($CLIENT_SECRET) {
        set $client_secret "client_secret=${CLIENT_SECRET}";
    }

    # Reverse proxy to GitHub OAuth access token
    location = /auth {
        # Handle query arguments
        set $token "";
        if ($is_args) {
            set $token "&";
        }

        # Concatenate the query arguments with client_id and client_secret, if set
        set $args "${args}${token}${client_id}&${client_secret}";

        # Proxy request to GitHub OAuth access token endpoint
        proxy_pass https://github.com/login/oauth/access_token$is_args$args;
        proxy_set_header Accept "application/json";
    }

    # Serve Vue.js application and handle optional URL rewrites
    location / {
        root /usr/share/nginx/html;
        index index.html;
        try_files $uri $uri/ /index.html;

        # Optional: Redirect requests that lack a trailing slash to add one
        rewrite ^([^.]*[^/])$ $1/ permanent;
    }
}