server {
    listen 80;
    server_name _;

    large_client_header_buffers 4 16k;

    location = /health {
        access_log off;
        default_type text/plain;
        return 200 "ok\n";
    }

    location = /oauth2/auth {
        internal;
        proxy_pass http://oauth2-proxy:4180;
        proxy_pass_request_body off;
        proxy_set_header Content-Length "";
        proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Host $http_host;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Uri $request_uri;
    }

    location /oauth2/ {
        proxy_pass http://oauth2-proxy:4180;
        proxy_http_version 1.1;
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Host $http_host;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Auth-Request-Redirect $scheme://$http_host$request_uri;
    }

    location = /api/edge {
        auth_request /oauth2/auth;
        error_page 401 = @api_unauthorized;

        auth_request_set $auth_user $upstream_http_x_auth_request_user;
        auth_request_set $auth_email $upstream_http_x_auth_request_email;
        auth_request_set $auth_cookie $upstream_http_set_cookie;
        add_header Set-Cookie $auth_cookie always;

        proxy_pass http://app:8081/edge/me;
        proxy_set_header X-Auth-Request-User $auth_user;
        proxy_set_header X-Auth-Request-Email $auth_email;
        proxy_set_header X-Internal-Auth-Token "${INTERNAL_AUTH_TOKEN}";
    }

    location / {
        auth_request /oauth2/auth;
        error_page 401 = @oauth2_signin;

        auth_request_set $auth_user $upstream_http_x_auth_request_user;
        auth_request_set $auth_email $upstream_http_x_auth_request_email;
        auth_request_set $auth_cookie $upstream_http_set_cookie;
        add_header Set-Cookie $auth_cookie always;

        proxy_pass http://app:8081/edge/me;
        proxy_set_header X-Auth-Request-User $auth_user;
        proxy_set_header X-Auth-Request-Email $auth_email;
        proxy_set_header X-Internal-Auth-Token "${INTERNAL_AUTH_TOKEN}";
    }

    location @oauth2_signin {
        return 302 $scheme://$http_host/oauth2/start?rd=$scheme://$http_host$request_uri;
    }

    location @api_unauthorized {
        default_type application/json;
        return 401 '{"error":"authentication required"}';
    }
}