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;; SPDX-License-Identifier: CC0-1.0

;; Copyright (C) 2022 Wojtek Kosior <koszko@koszko.org>
;;
;; Available under the terms of Creative Commons Zero v1.0 Universal.

(use-modules (gnu)
             (koszko-org-website)
             (hydrilla-website)
             (hydrilla-json-schemas)
             (hydrilla)
             ;; The following 4 are needed to construct GUIX_PYTHONPATH for
             ;; Hydrilla WSGI scripts.
             (guix build-system python)
             (guix packages)
             (guix search-paths)
             (guix modules))
(use-package-modules web)
(use-package-modules python)
(use-service-modules web)
(use-service-modules shepherd)

(define %here
  (getcwd))

(define* (simple-wsgi-alias-gexp package wsgi-path #:key (aliased-path "/"))
  #~(let* ((wsgi-file (string-append #$package #$wsgi-path)))
      (format #f
              "\
              <Files ~s>
                  Require all granted
              </Files>
              WSGIScriptAlias ~a ~a
              "
              wsgi-file #$aliased-path wsgi-file)))

(define %koszko-org-virtualhost
  (httpd-virtualhost
   "*:80"
   (list "\
         ServerName koszko.org
         ServerAlias www.koszko.org
         DocumentRoot /srv/http/koszko.org
         ServerAdmin koszko@koszko.org

         <If \"%{HTTP_HOST} != 'koszko.org'\">
             Redirect permanent / http://koszko.org/
         </If>

         Alias /sideload /srv/http/koszko.org

         WSGIScriptReloading On
         "
         (simple-wsgi-alias-gexp koszko-org-website
                                 "/share/koszko-org-website/wsgi.py"))))

(define %koszkonutek-tmp-virtualhost
  (httpd-virtualhost
   "*:80"
   '("\
     ServerName koszkonutek-tmp.pl.eu.org
     ServerAlias www.koszkonutek-tmp.pl.eu.org

     Redirect permanent / http://koszko.org/
     ")))

(define %hydrillabugs-virtualhost
  (httpd-virtualhost
   "*:80"
   '("\
    ServerName hydrillabugs.koszko.org
    ServerAlias www.hydrillabugs.koszko.org
    ServerAdmin koszko@koszko.org

    <Proxy *>
        Redirect permanent /projects/hachette /projects/haketilo

        # I don't remember why I added the following line so I'm keeping it just
        # in case.
        RequestHeader unset Accept-Encoding
    </Proxy>

    ProxyPass /projects/haketilo http://10.207.87.1:21011/projects/hachette
    ProxyPassReverse /projects/haketilo http://10.207.87.1:21011/projects/hachette

    ProxyPass / http://10.207.87.1:21011/
    ProxyPassReverse / http://10.207.87.1:21011/
    ")))

(define %hachettebugs-virtualhost
  (httpd-virtualhost
   "*:80"
   '("\
     ServerName hachettebugs.koszko.org
     ServerAlias www.hachettebugs.koszko.org

     Redirect permanent / http://hydrillabugs.org/
     ")))

(define %haketilo-virtualhost
  (httpd-virtualhost
   "*:80"
   (list "\
         ServerName haketilo.koszko.org
         ServerAlias www.haketilo.koszko.org
         ServerAdmin koszko@koszko.org

         <If \"%{HTTP_HOST} != 'haketilo.koszko.org'\">
             Redirect permanent / http://haketilo.koszko.org/
         </If>

         WSGIScriptReloading On
         "
         (simple-wsgi-alias-gexp hydrilla-website
                                 "/share/hydrilla-website/wsgi.py"))))

(define %python-path-spec-sexp
   (search-path-specification->sexp
    (guix-pythonpath-search-path (package-version (default-python)))))

(define %hydrilla-pythonpath-inputs
  (cons hydrilla (map cadr (package-transitive-target-inputs hydrilla))))

(define %hydrilla-pythonpath-gexp
  (with-imported-modules (source-module-closure '((guix search-paths)))
    #~(begin
        (use-modules (guix search-paths))
        (let ((evaluated-list (evaluate-search-paths
                      (list (sexp->search-path-specification
                             '#$%python-path-spec-sexp))
                      '#$%hydrilla-pythonpath-inputs)))
          (cdar evaluated-list)))))

(define %hydrilla-wsgi-regex
  "^/api_v[^/]+/((resource|mapping)/[^/]+[.]json|query|list_all)$")

(define %hydrilla-virtualhost
  (httpd-virtualhost
   "*:80"
   (list "\
         ServerName hydrilla.koszko.org
         ServerAlias www.hydrilla.koszko.org
         ServerAdmin koszko@koszko.org

         <If \"%{HTTP_HOST} != 'hydrilla.koszko.org'\">
             Redirect permanent / http://hydrilla.koszko.org/
         </If>
         "
         #~(format #f "Alias /schemas ~a\n"
                   (string-append #$hydrilla-json-schemas
                                  "/share/hydrilla-json-schemas"))
         "\

         DocumentRoot /var/lib/hydrilla/malcontent_dirs
         <Location ~ \"^/api_v[^/]+/(resource|mapping)/\">
             ForceType application/json
         </Location>

         WSGIScriptReloading On
         "
         (format #f "SetEnvIf Request_URI ~s MALCONENT_DIR=~a\n"
                 "^/(api_v[0-9]+)/"
                 "/var/lib/hydrilla/malcontent_dirs/$1")
         #~(format #f "SetEnvIf Request_URI ~s HYDRILLA_GUIX_PYTHONPATH=~a\n"
                   "^/api_v[0-9]+/"
                   #$%hydrilla-pythonpath-gexp)
         #~(format #f "WSGIScriptAliasMatch ~s ~a\n"
                   #$%hydrilla-wsgi-regex
                   (string-append
                    #$(local-file (string-append %here "/hydrilla-wsgi.py"))
                    "/$1")))))

(define %wsgi-module
  (httpd-module
   (name "wsgi_module")
   (file (file-append mod-wsgi "/modules/mod_wsgi.so"))))

(define %proxy-http-modules
  (list (httpd-module
         (name "proxy_module")
         (file (file-append httpd "/modules/mod_proxy.so")))
        (httpd-module
         (name "proxy_http_module")
         (file (file-append httpd "/modules/mod_proxy_http.so")))))

;; logio is needed for the '%O' log format directive
(define %logio-module
  (httpd-module
   (name "logio_module")
   (file (file-append httpd "/modules/mod_logio.so"))))

(define %logformat-combined
  "\"%h %l %u %t \\\"%r\\\" %>s %O \\\"%{Referer}i\\\" \\\"%{User-Agent}i\\\"\"")

(define %koszko-httpd-service
  (service
   httpd-service-type
   (httpd-configuration
    (config
     (httpd-config-file
      (server-name "koszko.org")
      (error-log "/var/log/httpd/error.log")
      (modules `(,%wsgi-module
                 ,@%proxy-http-modules
                 ,%logio-module
                 ,@%default-httpd-modules))
      (extra-config
       (list
        (string-join `("LogFormat" ,%logformat-combined "combined")) "\n"
        "CustomLog /var/log/httpd/access.log combined" "\n"
        )))))))

(operating-system
  (host-name "koszko")
  (timezone "Europe/Warsaw")
  (groups (cons* (user-group
                  ;; The `httpd` group must have an explicit id so that the host
                  ;; can provide files that are readable by Apache and not
                  ;; readable by the world.
                  (name "httpd")
                  (id 133)
                  (system? #t))
                 %base-groups))
  (file-systems (cons (file-system
                        (device (file-system-label "does-not-matter"))
                        (mount-point "/")
                        (type "ext4"))
                      %base-file-systems))
  (bootloader (bootloader-configuration
               (bootloader grub-bootloader)
               (targets '("/dev/sdDOES-NOT-MATTER"))))
  (services
   (cons* %koszko-httpd-service
          (simple-service 'koszko-org-website httpd-service-type
                          (list %koszko-org-virtualhost
                                %koszkonutek-tmp-virtualhost
                                %hydrillabugs-virtualhost
                                %hachettebugs-virtualhost
                                %haketilo-virtualhost
                                %hydrilla-virtualhost))
          (service
           (shepherd-service-type
            'dummy-network
            (const
             (shepherd-service
              (documentation "Provide 'networking' without actually doing anything")
              (provision '(networking))
              (start #~(const #t))
              (stop #~(const #t))
              (respawn? #f)))
            (description "Make other services assume network is there."))
           #f)
          %base-services)))