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;;; guix-forge --- Guix software forge meta-service
;;; Copyright © 2023, 2025–2026 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of guix-forge.
;;;
;;; guix-forge is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published
;;; by the Free Software Foundation, either version 3 of the License,
;;; or (at your option) any later version.
;;;
;;; guix-forge is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with guix-forge.  If not, see
;;; <https://www.gnu.org/licenses/>.

(define-module (forge nginx)
  #:use-module (forge acme)
  #:use-module (forge socket)
  #:use-module ((gnu packages admin) #:select (shepherd))
  #:use-module (gnu services)
  #:use-module (gnu services web)
  #:use-module (guix gexp)
  #:use-module (guix records)
  #:use-module (ice-9 match)
  #:use-module (srfi srfi-1)
  #:export (<forge-nginx-configuration>
            forge-nginx-configuration
            forge-nginx-configuration?
            forge-nginx-configuration-http-listen
            forge-nginx-configuration-https-listen
            forge-nginx-configuration-proxy-protocol-listen
            forge-nginx-configuration-acme-state-directory
            forge-nginx-configuration-acme-challenge-directory
            forge-nginx-configuration-server-blocks

            <forge-nginx-server-configuration>
            forge-nginx-server-configuration
            forge-nginx-server-configuration?
            forge-nginx-server-configuration-server-name
            forge-nginx-server-configuration-root
            forge-nginx-server-configuration-locations
            forge-nginx-server-configuration-index
            forge-nginx-server-configuration-try-files
            forge-nginx-server-configuration-raw-content

            nginx-socket->string
            socket->nginx-proxy-pass
            forge-nginx-service-type))

(define-record-type* <forge-nginx-configuration>
  forge-nginx-configuration make-forge-nginx-configuration
  forge-nginx-configuration?
  (http-listen forge-nginx-configuration-http-listen
               (default (forge-ip-socket
                         (ip "0.0.0.0")
                         (port 80))))
  (https-listen forge-nginx-configuration-https-listen
                (default (forge-ip-socket
                          (ip "0.0.0.0")
                          (port 443))))
  (proxy-protocol-listen forge-nginx-configuration-proxy-protocol-listen
                         (default #f))
  (acme-state-directory forge-nginx-configuration-acme-state-directory
                        (default "/var/lib/acme"))
  (acme-challenge-directory forge-nginx-configuration-acme-challenge-directory
                            (default "/var/run/acme/acme-challenge"))
  (server-blocks forge-nginx-configuration-server-blocks
                 (default '())))

(define-record-type* <forge-nginx-server-configuration>
  forge-nginx-server-configuration make-forge-nginx-server-configuration
  forge-nginx-server-configuration?
  (server-name forge-nginx-server-configuration-server-name
               (default (list 'default)))
  (root forge-nginx-server-configuration-root
        (default "/srv/http"))
  (locations forge-nginx-server-configuration-locations
             (default '()))
  (index forge-nginx-server-configuration-index
         (default (list "index.html")))
  (try-files forge-nginx-server-configuration-try-files
             (default '()))
  (raw-content forge-nginx-server-configuration-raw-content
               (default '())))

(define (nginx-socket->string socket)
  "Serialize @var{socket} to a string as expected by nginx
configuration (for example, in the @code{listen} and
@code{fastcgi_pass} directives)."
  (match socket
    (($ <forge-host-socket> hostname port)
     (string-append hostname ":" (number->string port)))
    (($ <forge-ip-socket> (or "0.0.0.0" "::") port)
     (number->string port))
    (($ <forge-ip-socket> (? ipv4-address? ip) port)
     (string-append ip ":" (number->string port)))
    (($ <forge-ip-socket> (? ipv6-address? ip) port)
     (string-append "[" ip "]" ":" (number->string port)))
    (($ <forge-unix-socket> path)
     (string-append "unix:" path))))

(define (socket->nginx-proxy-pass socket)
  "Serialize @var{socket}, a forge socket, to an nginx @code{proxy_pass}
directive."
  (string-append
   "proxy_pass "
   (match socket
     (($ <forge-host-socket> hostname port)
      (string-append "http://" hostname ":" (number->string port)))
     (($ <forge-ip-socket> (? ipv4-address? ip) port)
      (string-append "http://" ip ":" (number->string port)))
     (($ <forge-ip-socket> (? ipv6-address? ip) port)
      (string-append "http://[" ip "]:" (number->string port)))
     (($ <forge-unix-socket> path)
      (string-append "http://unix:" path ":")))
   ";"))

(define (forge-nginx-configuration-coerced-server-blocks config)
  "Return server blocks in @code{forge-nginx-configuration} @var{config}, all
coerced into @code{<forge-nginx-server-configuration>} objects."
  (map (lambda (server)
         (if (nginx-server-configuration? server)
             (forge-nginx-server-configuration
              (server-name (nginx-server-configuration-server-name server))
              (root (nginx-server-configuration-root server))
              (locations (nginx-server-configuration-locations server))
              (index (nginx-server-configuration-index server))
              (try-files (nginx-server-configuration-try-files server))
              (raw-content (nginx-server-configuration-raw-content server)))
             server))
       (forge-nginx-configuration-server-blocks config)))

(define (forge-nginx-server-blocks config)
  "Return list of nginx server blocks to provision for forge-web service
specified by @var{config}."
  (match-record config <forge-nginx-configuration>
    (http-listen https-listen proxy-protocol-listen acme-state-directory acme-challenge-directory)
    (cons (nginx-server-configuration
           (listen (list (nginx-socket->string http-listen)))
           (locations
            (list (nginx-location-configuration
                   (uri "/.well-known/acme-challenge/")
                   ;; Without a trailing slash, an alias of /var/foo
                   ;; would lookup /bar at /var/foobar, not
                   ;; /var/foo/bar. So, a trailing slash is
                   ;; significant. Append it if not already
                   ;; present. Likewise, the trailing slash in
                   ;; "/.well-known/acme-challenge/" is also
                   ;; significant.
                   (body (list (string-append "alias "
                                              (string-trim-right acme-challenge-directory #\/)
                                              "/;"))))
                  (nginx-location-configuration
                   (uri "/")
                   ;; HTTP Strict Transport Security (HSTS) header as
                   ;; recommended by https://hstspreload.org
                   (body (list "add_header Strict-Transport-Security \"max-age=63072000; includeSubdomains; preload\";"
                               "return 301 https://$host$request_uri;"))))))
          (map (match-record-lambda <forge-nginx-server-configuration>
                 (server-name root locations index try-files anubis-uri-prefix raw-content)
                 (match server-name
                   ((name _ ...)
                    (nginx-server-configuration
                      (listen (cons (string-append (nginx-socket->string https-listen)
                                                   " ssl")
                                    (if proxy-protocol-listen
                                        (list (string-append (nginx-socket->string proxy-protocol-listen)
                                                             " ssl proxy_protocol"))
                                        (list))))
                      (server-name server-name)
                      (root root)
                      (locations locations)
                      (index index)
                      (try-files try-files)
                      (ssl-certificate (string-append acme-state-directory
                                                      "/" name "/cert.pem"))
                      (ssl-certificate-key (string-append acme-state-directory
                                                          "/private/" name "/key.pem"))
                      (raw-content raw-content)))))
               (forge-nginx-configuration-coerced-server-blocks config)))))

(define %deploy-hook-gexp
  (with-imported-modules '((guix build utils))
    #~(begin
        (use-modules (guix build utils))

        ;; Restart nginx.
        ;; We cannot refer to sudo in the store since that sudo does
        ;; not have the setuid bit set. See "(guix) Setuid Programs".
        (invoke "/run/setuid-programs/sudo"
                #$(file-append shepherd "/bin/herd")
                "restart"
                "nginx"))))

(define (forge-nginx-acme-certificates config)
  "Return list of @code{<acme-certificate>} blocks to provision for
forge-nginx service specified by @var{config}."
  (map (lambda (server)
         (acme-certificate
          (domains (forge-nginx-server-configuration-server-name server))
          (deploy-hook (program-file "forge-nginx-acme-deploy-hook"
                                     %deploy-hook-gexp))))
       (forge-nginx-configuration-coerced-server-blocks config)))

(define forge-nginx-service-type
  (service-type
   (name 'forge-nginx)
   (description "Run the forge-nginx web server.")
   (extensions (list (service-extension nginx-service-type
                                        forge-nginx-server-blocks)
                     (service-extension acme-service-type
                                        forge-nginx-acme-certificates)))
   (compose concatenate)
   (extend (lambda (config server-blocks)
             (forge-nginx-configuration
              (inherit config)
              (server-blocks (append (forge-nginx-configuration-server-blocks config)
                                     server-blocks)))))
   (default-value (forge-nginx-configuration))))