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;; disfluid, implementation of the Solid specification
;; Copyright (C) 2020, 2021  Vivien Kraus

;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU Affero General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.

;; This program 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 Affero General Public License for more details.

;; You should have received a copy of the GNU Affero General Public License
;; along with this program.  If not, see <https://www.gnu.org/licenses/>.

(define-module (vkraus services disfluid)
  #:use-module (gnu services)
  #:use-module (gnu services shepherd)
  #:use-module (gnu services admin)
  #:use-module (gnu services web)
  #:use-module (gnu system shadow)
  #:use-module (gnu packages admin)
  #:use-module (vkraus packages disfluid)
  #:use-module (guix gexp)
  #:use-module (guix modules)
  #:use-module (guix records)
  #:use-module (ice-9 match)
  #:use-module (ice-9 optargs))

(define-record-type* <disfluid-configuration>
  disfluid-configuration
  make-disfluid-configuration
  disfluid-configuration?
  (disfluid disfluid-configuration-disfluid
            (default disfluid))
  (complete-corresponding-source
   disfluid-configuration-complete-corresponding-source)
  (configuration disfluid-configuration-configuration)
  (port disfluid-issuer-configuration-port (default 8088))
  (extra-options
   disfluid-issuer-configuration-extra-options
   (default '())))

(export <disfluid-configuration>
        disfluid-configuration
        make-disfluid-configuration
        disfluid-configuration?
        disfluid-configuration-disfluid
        disfluid-configuration-complete-corresponding-source
        disfluid-configuration-configuration
        disfluid-issuer-configuration-port
        disfluid-issuer-configuration-extra-options)

(define configuration->shepherd-service
  (match-lambda
    (($ <disfluid-configuration>
        disfluid ccs configuration port extra-options)
     `(,(shepherd-service
         (provision (list "disfluid"))
         (documentation (format #f "Run disfluid"))
         (requirement '(user-processes))
         (modules '((gnu build shepherd)
                    (gnu system file-systems)))
         (start
          (with-imported-modules
              (source-module-closure
               '((gnu build shepherd)
                 (gnu system file-systems)))
            #~(begin
                (let* ((user (getpwnam "disfluid"))
                       (prepare-directory
                        (lambda (dir)
                          (mkdir-p dir)
                          (chown dir (passwd:uid user) (passwd:gid user))
                          (chmod dir #o700))))
                  (prepare-directory "/var/log/disfluid")
                  (prepare-directory "/var/lib/disfluid")
                  (prepare-directory "/var/cache/disfluid"))
                (make-forkexec-constructor
                 (list
                  (string-append #$disfluid "/bin/disfluid")
                  "-S" #$ccs
                  "-c" #$configuration
                  "-p" (with-output-to-string (lambda () (display #$port)))
                  "-l" "server.log"
                  "-e" "server.err"
                  #$@extra-options)
                 #:user "disfluid"
                 #:group "disfluid"
                 #:directory "/var/log/disfluid"
                 #:environment-variables
                 '("XDG_DATA_HOME=/var/lib/disfluid"
                   "XDG_CACHE_HOME=/var/cache/disfluid")))))
         (stop #~(make-kill-destructor)))))))

(define %disfluid-accounts
  (list (user-group (name "disfluid")
                    (system? #t))
        (user-account
         (name "disfluid")
         (group "disfluid")
         (system? #t)
         (comment "The user that runs the disfluid servers.")
         (home-directory "/var/empty")
         (shell (file-append shadow "/sbin/nologin")))))

(define configuration->log-rotation
  (match-lambda
    (($ <disfluid-configuration>
        disfluid ccs configuration port extra-options)
     `(,(log-rotation
         (frequency 'daily)
         (files
          (map (lambda (ext)
                 (format #f "/var/log/disfluid/server.~a" ext))
               '("log err")))
         (options '("sharedscripts" "storedir /var/log/disfluid")))))))

(define-public disfluid-service-type
  (service-type
   (name 'disfluid)
   (extensions
    (list
     (service-extension account-service-type
                        (const %disfluid-accounts))
     (service-extension rottlog-service-type
                        configuration->log-rotation)
     (service-extension
      shepherd-root-service-type
      configuration->shepherd-service)))))

(define-public disfluid-website
  (nginx-server-configuration
   (server-name '("disfluid.planete-kraus.eu" "webid-oidc.planete-kraus.eu"))
   (listen '("443 ssl" "[::]:443 ssl"))
   (ssl-certificate "/etc/letsencrypt/live/planete-kraus.eu/fullchain.pem")
   (ssl-certificate-key "/etc/letsencrypt/live/planete-kraus.eu/privkey.pem")
   (root disfluid:website)
   (locations
    (list
     (nginx-location-configuration
      (uri "/project")
      (body
       (list "default_type text/turtle ;")))))))