#
# You can find a documented example of configuration in ./docs/proxies/nginx.md.
#
worker_processes  1;
events {
    worker_connections  1024;
}

http {
    server {
        listen 8080 ssl;
        server_name ~^login\.example([0-9])*\.com$;

        resolver 127.0.0.11 ipv6=off;
        set $frontend_endpoint http://authelia-frontend:3000;
        set $backend_endpoint https://authelia-backend:9091;
        set $metrics_endpoint http://authelia-backend:9959;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Frame-Options "SAMEORIGIN";

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        # Serve the backend API for the portal.
        location /api {
            proxy_set_header  X-Real-IP $remote_addr;

            # Required by Authelia because "trust proxy" option is used.
            # See https://expressjs.com/en/guide/behind-proxies.html
            proxy_set_header  X-Forwarded-Proto $scheme;

            # Required by Authelia to build correct links for identity validation.
            proxy_set_header  X-Forwarded-Host $http_host;
            proxy_set_header  X-Forwarded-URI $request_uri;

            # Needed for network ACLs to work. It appends the IP of the client to the list of IPs
            # and allows Authelia to use it to match the network-based ACLs.
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_intercept_errors on;

            proxy_pass        $backend_endpoint;
        }

        location /.well-known {
            # Required by Authelia because "trust proxy" option is used.
            # See https://expressjs.com/en/guide/behind-proxies.html
            proxy_set_header  X-Forwarded-Proto $scheme;

            # Required by Authelia to build correct links for identity validation.
            proxy_set_header  X-Forwarded-Host $http_host;
            proxy_set_header  X-Forwarded-URI $request_uri;

            # Needed for network ACLs to work. It appends the IP of the client to the list of IPs
            # and allows Authelia to use it to match the network-based ACLs.
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_intercept_errors on;

            proxy_pass        $backend_endpoint;
        }

        location /locales {
            # Required by Authelia because "trust proxy" option is used.
            # See https://expressjs.com/en/guide/behind-proxies.html
            proxy_set_header  X-Forwarded-Proto $scheme;

            # Required by Authelia to build correct links for identity validation.
            proxy_set_header  X-Forwarded-Host $http_host;
            proxy_set_header  X-Forwarded-URI $request_uri;

            # Needed for network ACLs to work. It appends the IP of the client to the list of IPs
            # and allows Authelia to use it to match the network-based ACLs.
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_intercept_errors on;

            proxy_pass        $backend_endpoint;
        }

        location /jwks.json {
            # Required by Authelia because "trust proxy" option is used.
            # See https://expressjs.com/en/guide/behind-proxies.html
            proxy_set_header  X-Forwarded-Proto $scheme;

            # Required by Authelia to build correct links for identity validation.
            proxy_set_header  X-Forwarded-Host $http_host;
            proxy_set_header  X-Forwarded-URI $request_uri;

            # Needed for network ACLs to work. It appends the IP of the client to the list of IPs
            # and allows Authelia to use it to match the network-based ACLs.
            proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;

            proxy_intercept_errors on;

            proxy_pass        $backend_endpoint;
        }

        location /metrics {
            proxy_pass        $metrics_endpoint;
        }

        # Serves the portal application.
        location / {
            # Allow websockets for webpack to auto-reload.
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "Upgrade";
            proxy_set_header Host $host:$server_port;

            proxy_pass        $frontend_endpoint;
        }

        # Proxies requests to backend for dev workflow.
        location /devworkflow {
            proxy_pass        $backend_endpoint;
        }
    }

    # Serves the home page.
    server {
        listen 8080 ssl;
        server_name ~^home\.example([0-9])*\.com$;

        resolver 127.0.0.11 ipv6=off;
        set $upstream_endpoint http://nginx-backend;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Frame-Options "SAMEORIGIN";

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        location / {
            proxy_set_header  Host $http_host;
            proxy_pass        $upstream_endpoint;
        }
    }

    # Example configuration of domains protected by Authelia.
    server {
        listen 8080 ssl;
        server_name ~^(public|admin|secure|dev|singlefactor|mx[1-2])(\.mail)?\.(?<basedomain>example([0-9])*\.com)$;

        resolver 127.0.0.11 ipv6=off;
        set $upstream_authelia https://authelia-backend:9091/api/authz/auth-request;
        set $upstream_endpoint http://nginx-backend;
        set $upstream_headers http://httpbin:8000/headers;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Frame-Options "SAMEORIGIN";

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        # Reverse proxy to the backend. It is protected by Authelia by forwarding authorization checks
        # to the virtual endpoint introduced by nginx and declared in the next block.
        location / {
			## Send a subrequest to Authelia to verify if the user is authenticated and has permission to access the resource.
			auth_request /internal/authelia/authz;

			## Set the $target_url variable based on the original request.
			set $target_url $scheme://$http_host$request_uri;

			## Save the upstream authorization response headers from Authelia to variables.
			auth_request_set $authorization $upstream_http_authorization;
			auth_request_set $proxy_authorization $upstream_http_proxy_authorization;

			## Inject the authorization response headers from the variables into the request made to the backend.
			proxy_set_header Authorization $authorization;
			proxy_set_header Proxy-Authorization $proxy_authorization;

			## Save the upstream metadata response headers from Authelia to variables.
			auth_request_set $user $upstream_http_remote_user;
			auth_request_set $groups $upstream_http_remote_groups;
			auth_request_set $name $upstream_http_remote_name;
			auth_request_set $email $upstream_http_remote_email;

			## Inject the metadata response headers from the variables into the request made to the backend.
			proxy_set_header Remote-User $user;
			proxy_set_header Remote-Groups $groups;
			proxy_set_header Remote-Email $email;
			proxy_set_header Remote-Name $name;

			## Include the Set-Cookie header if present.
			auth_request_set $cookie $upstream_http_set_cookie;
			add_header Set-Cookie $cookie;

			## If the subreqest returns 200 pass to the backend, if the subrequest returns 401 redirect to the portal.
			error_page 401 =302 https://login.$basedomain:8080/?rd=$target_url;

            # Authelia relies on Proxy-Authorization header to authenticate in basic auth.
            # but for the sake of simplicity (because Authorization in supported in most
            # clients) we take Authorization from the frontend and rewrite it to
            # Proxy-Authorization before sending it to Authelia.
            proxy_set_header            Proxy-Authorization $http_authorization;

            # Route the request to the correct virtual host in the backend.
            proxy_set_header            Host $http_host;

            proxy_pass                  $upstream_endpoint;
        }

        # Virtual endpoint forwarding requests to Authelia server.
        location /internal/authelia/authz {
			## Essential Proxy Configuration
			internal;
			proxy_pass $upstream_authelia;

            # Provide either X-Original-URL and X-Forwarded-Proto or
            # X-Forwarded-Proto, X-Forwarded-Host and X-Forwarded-URI or both.
            # Those headers will be used by Authelia to deduce the target url of the user.
            #
            # X-Forwarded-Proto is mandatory since Authelia uses the "trust proxy" option.
            # See https://expressjs.com/en/guide/behind-proxies.html
            proxy_set_header X-Original-Method $request_method;
            proxy_set_header X-Original-URL    $scheme://$http_host$request_uri;
            proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
			proxy_set_header Content-Length    "";
			proxy_set_header Connection        "";

            # Authelia can receive Proxy-Authorization to authenticate however most of the clients
            # support Authorization instead. Therefore we rewrite Authorization into Proxy-Authorization.
            proxy_set_header            Proxy-Authorization $http_authorization;

			## Basic Proxy Configuration
			proxy_pass_request_body off;
			proxy_next_upstream error timeout invalid_header http_500 http_502 http_503; # Timeout if the real server is dead
			proxy_redirect http:// $scheme://;
			proxy_http_version 1.1;
			proxy_cache_bypass $cookie_session;
			proxy_no_cache $cookie_session;
			proxy_buffers 4 32k;
			client_body_buffer_size 128k;

			## Advanced Proxy Configuration
			send_timeout 5m;
			proxy_read_timeout 240;
			proxy_send_timeout 240;
			proxy_connect_timeout 240;
        }

        # Used by suites to test the forwarded users and groups headers produced by Authelia.
        location /headers {
			## Send a subrequest to Authelia to verify if the user is authenticated and has permission to access the resource.
			auth_request /internal/authelia/authz;

			## Set the $target_url variable based on the original request.
			set $target_url $scheme://$http_host$request_uri;

			## Save the upstream authorization response headers from Authelia to variables.
			auth_request_set $authorization $upstream_http_authorization;
			auth_request_set $proxy_authorization $upstream_http_proxy_authorization;

			## Inject the authorization response headers from the variables into the request made to the backend.
			proxy_set_header Authorization $authorization;
			proxy_set_header Proxy-Authorization $proxy_authorization;

			## Save the upstream metadata response headers from Authelia to variables.
			auth_request_set $user $upstream_http_remote_user;
			auth_request_set $groups $upstream_http_remote_groups;
			auth_request_set $name $upstream_http_remote_name;
			auth_request_set $email $upstream_http_remote_email;

			## Inject the metadata response headers from the variables into the request made to the backend.
			proxy_set_header Remote-User $user;
			proxy_set_header Remote-Groups $groups;
			proxy_set_header Remote-Email $email;
			proxy_set_header Remote-Name $name;

			## Include the Set-Cookie header if present.
			auth_request_set $cookie $upstream_http_set_cookie;
			add_header Set-Cookie $cookie;

			## If the subreqest returns 200 pass to the backend, if the subrequest returns 401 redirect to the portal.
			error_page 401 =302 https://login.$basedomain:8080/?rd=$target_url;

            proxy_pass                  $upstream_headers;
        }
    }

    # Example configuration of domains protected by Authelia.
    server {
        listen 8080 ssl;
        server_name ~^oidc(-public)?\.(?<basedomain>example([0-9])*\.com)$;

        resolver 127.0.0.11 ipv6=off;
        set $upstream_authelia https://authelia-backend:9091/api/authz/auth-request;
        set $upstream_endpoint http://oidc-client:8080;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Frame-Options "SAMEORIGIN";

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        # Reverse proxy to the backend. It is protected by Authelia by forwarding authorization checks
        # to the virtual endpoint introduced by nginx and declared in the next block.
        location / {
			## Send a subrequest to Authelia to verify if the user is authenticated and has permission to access the resource.
			auth_request /internal/authelia/authz;

			## Set the $target_url variable based on the original request.
			set $target_url $scheme://$http_host$request_uri;

			## Save the upstream authorization response headers from Authelia to variables.
			auth_request_set $authorization $upstream_http_authorization;
			auth_request_set $proxy_authorization $upstream_http_proxy_authorization;

			## Inject the authorization response headers from the variables into the request made to the backend.
			proxy_set_header Authorization $authorization;
			proxy_set_header Proxy-Authorization $proxy_authorization;

			## Save the upstream metadata response headers from Authelia to variables.
			auth_request_set $user $upstream_http_remote_user;
			auth_request_set $groups $upstream_http_remote_groups;
			auth_request_set $name $upstream_http_remote_name;
			auth_request_set $email $upstream_http_remote_email;

			## Inject the metadata response headers from the variables into the request made to the backend.
			proxy_set_header Remote-User $user;
			proxy_set_header Remote-Groups $groups;
			proxy_set_header Remote-Email $email;
			proxy_set_header Remote-Name $name;

			## Include the Set-Cookie header if present.
			auth_request_set $cookie $upstream_http_set_cookie;
			add_header Set-Cookie $cookie;

			## If the subreqest returns 200 pass to the backend, if the subrequest returns 401 redirect to the portal.
			error_page 401 =302 https://login.$basedomain:8080/?rd=$target_url;

            # Route the request to the correct virtual host in the backend.
            proxy_set_header            Host $http_host;

            proxy_pass                  $upstream_endpoint;
        }

        # Virtual endpoint forwarding requests to Authelia server.
        location /internal/authelia/authz {
			## Essential Proxy Configuration
			internal;
			proxy_pass $upstream_authelia;

            # Provide either X-Original-URL and X-Forwarded-Proto or
            # X-Forwarded-Proto, X-Forwarded-Host and X-Forwarded-URI or both.
            # Those headers will be used by Authelia to deduce the target url of the user.
            #
            # X-Forwarded-Proto is mandatory since Authelia uses the "trust proxy" option.
            proxy_set_header X-Original-Method $request_method;
            proxy_set_header X-Original-URL    $scheme://$http_host$request_uri;
            proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
			proxy_set_header Content-Length    "";
			proxy_set_header Connection        "";

            # Authelia can receive Proxy-Authorization to authenticate however most of the clients
            # support Authorization instead. Therefore we rewrite Authorization into Proxy-Authorization.
            proxy_set_header            Proxy-Authorization $http_authorization;

			## Basic Proxy Configuration
			proxy_pass_request_body off;
			proxy_next_upstream error timeout invalid_header http_500 http_502 http_503; # Timeout if the real server is dead
			proxy_redirect http:// $scheme://;
			proxy_http_version 1.1;
			proxy_cache_bypass $cookie_session;
			proxy_no_cache $cookie_session;
			proxy_buffers 4 32k;
			client_body_buffer_size 128k;

			## Advanced Proxy Configuration
			send_timeout 5m;
			proxy_read_timeout 240;
			proxy_send_timeout 240;
			proxy_connect_timeout 240;
        }
    }

    # Fake Web Mail used to receive emails sent by Authelia.
    server {
        listen 8080 ssl;
        server_name ~^mail\.example([0-9])*\.com$;

        resolver 127.0.0.11 ipv6=off;
        set $upstream_endpoint http://smtp:1080;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Frame-Options "SAMEORIGIN";

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        location / {
            proxy_set_header  Host $http_host;
            proxy_pass        $upstream_endpoint;
        }
    }

    # Fake API emulating Duo behavior
    server {
        listen 443 ssl;
        server_name ~^duo\.example([0-9])*\.com$;

        resolver 127.0.0.11 ipv6=off;
        set $upstream_endpoint http://duo-api:3000;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Frame-Options "SAMEORIGIN";

        error_page 497 301 =307 https://$host:$server_port$request_uri;

        location / {
            proxy_set_header  Host $http_host;
            proxy_pass        $upstream_endpoint;
        }
    }

    # Matches all domains. It redirects to the home page.
    server {
	    listen 8080 ssl;
	    server_name _;

        ssl_certificate     /pki/public.chain.pem;
        ssl_certificate_key /pki/private.pem;

	    return 301 https://home.example.com:8080/;
    }
}