chore: nginx config auth point to envoy

nginx/nginx.conf

@@ -5,8 +5,53 @@ server {
     root   /usr/share/nginx/html;
     index  index.html index.htm;
     try_files $uri $uri/ /index.html;
+
+    ##############################
+    # authentik-specific config
+    ##############################
+    auth_request     /outpost.goauthentik.io/auth/envoy;
+    error_page       401 = @goauthentik_proxy_signin;
+    auth_request_set $auth_cookie $upstream_http_set_cookie;
+    add_header       Set-Cookie $auth_cookie;
+
+    # translate headers from the outposts back to the actual upstream
+    auth_request_set $authentik_username $upstream_http_x_authentik_username;
+    auth_request_set $authentik_groups $upstream_http_x_authentik_groups;
+    auth_request_set $authentik_email $upstream_http_x_authentik_email;
+    auth_request_set $authentik_name $upstream_http_x_authentik_name;
+    auth_request_set $authentik_uid $upstream_http_x_authentik_uid;
+
+    proxy_set_header X-authentik-username $authentik_username;
+    proxy_set_header X-authentik-groups $authentik_groups;
+    proxy_set_header X-authentik-email $authentik_email;
+    proxy_set_header X-authentik-name $authentik_name;
+    proxy_set_header X-authentik-uid $authentik_uid;
   }
 
+  # all requests to /outpost.goauthentik.io must be accessible without authentication
+    location /outpost.goauthentik.io {
+        proxy_pass              https://auth.staging.graphpolaris.com/outpost.goauthentik.io;
+        # ensure the host of this vserver matches your external URL you've configured
+        # in authentik
+        proxy_ssl_server_name   on;
+        proxy_set_header        Host $host;
+        proxy_set_header        X-Original-URL $scheme://$http_host$request_uri;
+        add_header              Set-Cookie $auth_cookie;
+        auth_request_set        $auth_cookie $upstream_http_set_cookie;
+        proxy_pass_request_body off;
+        proxy_set_header        Content-Length "";
+    }
+
+    # Special location for when the /auth endpoint returns a 401,
+    # redirect to the /start URL which initiates SSO
+    location @goauthentik_proxy_signin {
+        internal;
+        add_header Set-Cookie $auth_cookie;
+        return 302 /outpost.goauthentik.io/start?rd=$request_uri;
+        # For domain level, use the below error_page to redirect to your authentik server with the full redirect path
+        # return 302 https://authentik.company/outpost.goauthentik.io/start?rd=$scheme://$http_host$request_uri;
+    }
+
   error_page 500 502 503 504 /50x.html;
 
   location = /50x.html {