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(use-modules (gnu)
             (gnu packages version-control)
             (gnu services certbot)
             (gnu services cgit)
             (gnu services networking)
             (gnu services ssh)
             (gnu services version-control)
             (gnu services web))

(define letsencrypt-cert
  "/etc/letsencrypt/live/dthompson.us/fullchain.pem")
(define letsencrypt-cert-key
  "/etc/letsencrypt/live/dthompson.us/privkey.pem")
(define dave-pub-key (local-file "keys/dave.pub"))
(define git-root "/var/lib/gitolite")
(define fcgiwrap-socket "127.0.0.1:9000")

(define nginx-accounts
  (list (user-group (name "nginx") (system? #t))
        (user-account
         (name "nginx")
         (group "nginx")
         (supplementary-groups '("git"))
         (system? #t)
         (comment "nginx server user")
         (home-directory "/var/empty")
         (shell (file-append (specification->package "shadow")
                             "/sbin/nologin")))))

;; Need to override the default nginx service account configuration so
;; that the nginx user is a member of the git group.
(define nginx-service-type*
  (service-type
   (inherit nginx-service-type)
   (extensions
    (map (lambda (extension)
           (if (eq? (service-extension-target extension)
                    account-service-type)
               (service-extension account-service-type
                                  (const nginx-accounts))
               extension))
         (service-type-extensions nginx-service-type)))))

(define takemi-os
  (operating-system
   (locale "en_US.utf8")
   (timezone "America/New_York")
   (keyboard-layout (keyboard-layout "us"))
   (host-name "takemi")
   (users (cons* (user-account
                  (name "dave")
                  (comment "David Thompson")
                  (group "users")
                  (home-directory "/home/dave")
                  (supplementary-groups
                   '("wheel" "netdev")))
                 (user-account
                  (name "publish")
                  (comment "Web file publisher")
                  (group "publish")
                  (home-directory "/var/www")
                  (system? #t)
                  (create-home-directory? #f))
                 %base-user-accounts))
   (groups (cons* (user-group
                   (name "publish")
                   (system? #t))
                  %base-groups))
   (sudoers-file
    (plain-file "sudoers"
                (string-append (plain-file-content %sudoers-specification)
                               ;; 'guix deploy' requires no password
                               ;; sudo capability.
                               "dave ALL = NOPASSWD: ALL\n")))
   (packages
    (append (map specification->package '("emacs" "nss-certs" "rsync"))
            %base-packages))
   (services
    (append
     (list (service dhcp-client-service-type)
           (service openssh-service-type
                    (openssh-configuration
                     (password-authentication? #f)
                     ;; So I can forward ports from my local host to
                     ;; the server and have the ports accessible from
                     ;; the internet.
                     (gateway-ports? #t)
                     (authorized-keys
                      `(("dave" ,dave-pub-key)
                        ("publish" ,dave-pub-key)))))
           (service gitolite-service-type
                    (gitolite-configuration
                     (admin-pubkey dave-pub-key)
                     (rc-file (gitolite-rc-file
                               ;; Grant read access to git group so
                               ;; cgit will work.
                               (umask #o0027)
                               (git-config-keys "gitweb\\..*")))))
           (service (service-type
                       (inherit certbot-service-type)
                       (extensions
                        ;; Replace original nginx-service-type with
                        ;; our modified one.
                        (map (lambda (extension)
                               (if (eq? (service-extension-target extension)
                                        nginx-service-type)
                                   (service-extension nginx-service-type*
                                                      (@@ (gnu services certbot)
                                                          certbot-nginx-server-configurations))
                                   extension))
                             (service-type-extensions certbot-service-type))))
                    (certbot-configuration
                     (email "dthompson2@worcester.edu")
                     (certificates
                      (list
                       (certificate-configuration
                        (domains '("dthompson.us"
                                   "www.dthompson.us"
                                   "git.dthompson.us"
                                   "files.dthompson.us"
                                   "haunt.dthompson.us"))
                        ;; Send SIGHUP signal to nginx to trigger a
                        ;; configuration reload, thus loading the
                        ;; updated certificates.
                        (deploy-hook (program-file
                                      "nginx-deploy-hook"
                                      #~(let ((pid (call-with-input-file
                                                       "/var/run/nginx/pid"
                                                     read)))
                                          (kill pid SIGHUP)))))))
                     (webroot "/var/www/certbot")))
           (service nginx-service-type*
                    (nginx-configuration
                     (server-blocks
                      (list (nginx-server-configuration
                             (listen '("443 ssl"))
                             (server-name '("www.dthompson.us"))
                             (root "/var/www/blog")
                             (ssl-certificate letsencrypt-cert)
                             (ssl-certificate-key letsencrypt-cert-key))
                            (nginx-server-configuration
                             (listen '("443 ssl"))
                             (server-name '("files.dthompson.us"))
                             (root "/var/www/files")
                             (raw-content '("autoindex on;"))
                             (ssl-certificate letsencrypt-cert)
                             (ssl-certificate-key letsencrypt-cert-key))
                            ;; I used to have the Haunt website under
                            ;; its own subdomain, and some sites still
                            ;; point to it.
                            (nginx-server-configuration
                             (listen '("443 ssl"))
                             (server-name '("haunt.dthompson.us"))
                             (root "/var/www/haunt")
                             (locations
                              (list
                               (nginx-location-configuration
                                (uri "/")
                                (body '("rewrite .* https://dthompson.us/projects/haunt.html permanent;")))))
                             (ssl-certificate letsencrypt-cert)
                             (ssl-certificate-key letsencrypt-cert-key))))))
           (service fcgiwrap-service-type
                    (fcgiwrap-configuration
                     ;; Use git group for read-only access to gitolite
                     ;; repos.
                     (group "git")
                     (socket (string-append "tcp:" fcgiwrap-socket))))
           (let ((cgit (specification->package "cgit")))
             (service (service-type
                       (inherit cgit-service-type)
                       (extensions
                        ;; Replace original nginx-service-type with
                        ;; our modified one.
                        (map (lambda (extension)
                               (if (eq? (service-extension-target extension)
                                        nginx-service-type)
                                   (service-extension nginx-service-type*
                                                      cgit-configuration-nginx-config)
                                   extension))
                             (service-type-extensions cgit-service-type))))
                      (cgit-configuration
                       (project-list (string-append git-root "/projects.list"))
                       (repository-directory (string-append git-root "/repositories"))
                       (root-desc "all i wanted was a pepsi") ; just one pepsi
                       (enable-git-config? #t)
                       ;; Cgit only supports the old HTTP "dumb"
                       ;; protocol, which notably libgit2 won't even
                       ;; entertain supporting.  So, we'll disable
                       ;; that and use Git itself to provide the HTTP
                       ;; "smart" protocol instead.
                       (enable-http-clone? #f)
                       (enable-index-links? #t)
                       (enable-index-owner? #f)
                       (enable-commit-graph? #t)
                       (enable-log-filecount? #t)
                       (enable-log-linecount? #t)
                       (remove-suffix? #t)
                       (clone-url '("https://git.dthompson.us/$CGIT_REPO_URL.git"))
                       ;; Is there a way to avoid this wrapper script?
                       (source-filter (program-file
                                       "cgit-syntax-highlight"
                                       #~(apply execl
                                                (string-append #$cgit "/lib/cgit/filters/syntax-highlighting.py")
                                                (command-line))))
                       (nginx
                        (list (nginx-server-configuration
                               (listen '("443 ssl"))
                               (server-name '("git.dthompson.us"))
                               (root cgit)
                               (locations
                                (list
                                 ;; URI paths with .git are handled by
                                 ;; Git's "smart" HTTP protocol.
                                 (nginx-location-configuration
                                  (uri "~ (/.*\\.git/.*)")
                                  (body
                                   `(("fastcgi_pass " ,fcgiwrap-socket ";")
                                     ("fastcgi_param SCRIPT_FILENAME "
                                      ,git "/libexec/git-core/git-http-backend;")
                                     "fastcgi_param QUERY_STRING $query_string;"
                                     "fastcgi_param REQUEST_METHOD $request_method;"
                                     "fastcgi_param CONTENT_TYPE $content_type;"
                                     "fastcgi_param CONTENT_LENGTH $content_length;"
                                     ("fastcgi_param GIT_PROJECT_ROOT "
                                      ,git-root "/repositories;")
                                     "fastcgi_param PATH_INFO $1;")))
                                 ;; Redirect old URLs to .git pages to
                                 ;; the new .git-less URL.  This
                                 ;; doesn't handle deeper links but
                                 ;; that's okay.
                                 (nginx-location-configuration
                                  (uri "~ (/.*)\\.git")
                                  (body
                                   `("return 301 $1;")))
                                 ;; Serve a static file if one exists,
                                 ;; otherwise send the request to
                                 ;; cgit.
                                 (nginx-location-configuration
                                  (uri "/")
                                  (body
                                   '("try_files $uri @cgit;")))
                                 (nginx-location-configuration
                                  (uri "@cgit")
                                  (body `("fastcgi_param SCRIPT_FILENAME $document_root/lib/cgit/cgit.cgi;"
                                          "fastcgi_param PATH_INFO $uri;"
                                          "fastcgi_param QUERY_STRING $args;"
                                          "fastcgi_param HTTP_HOST $server_name;"
                                          ("fastcgi_pass " ,fcgiwrap-socket ";"))))))
                               (ssl-certificate letsencrypt-cert)
                               (ssl-certificate-key letsencrypt-cert-key))))))))
     (map (lambda (s)
            (if (eq? (service-kind s) guix-service-type)
                (service guix-service-type
                         (guix-configuration
                          (authorized-keys (cons (local-file "keys/signing-key.pub")
                                                 %default-authorized-guix-keys))))
                s))
          %base-services)))
   (bootloader
    (bootloader-configuration
     (bootloader grub-bootloader)
     (targets '("/dev/vda"))
     (keyboard-layout keyboard-layout)))
   (initrd-modules
    (append '("virtio_scsi") %base-initrd-modules))
   (swap-devices (list "/dev/vda2"))
   (file-systems
    (cons* (file-system
            (mount-point "/")
            (device
             (uuid "f99d3ff5-57ea-4b20-bca7-bc2d58b4c364"
                   'ext4))
            (type "ext4"))
           %base-file-systems))))

(define takemi-host-key
  "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOrptBAMgs8dGDerBkcmZQ2W/0nEXtOBCl8nLlEwjKdI")

(list (machine
       (operating-system takemi-os)
       (environment managed-host-environment-type)
       (configuration (machine-ssh-configuration
                       (host-name "dthompson.us")
                       (system "x86_64-linux")
                       (user "dave")
                       (host-key takemi-host-key)))))