services: nginx: Virtual hosts are first-class configuration items.

* gnu/services/web.scm (<nginx-vhost-configuration>): New record type.
(config-domain-strings): New procedure.
(config-index-strings): New procedure.
(default-nginx-vhost-config): New procedure.
(default-nginx-config): Add vhost support and temporary directories
(nginx-activation): Create temporary directories
(nginx-service): Add vhost-list key.
* doc/guix.texi (Web Services): Document 'nginx-vhost-configuration'.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

doc/guix.texi

@@ -27,7 +27,8 @@ Copyright @copyright{} 2016 Chris Marusich@*
 Copyright @copyright{} 2016 Efraim Flashner@*
 Copyright @copyright{} 2016 John Darrington@*
 Copyright @copyright{} 2016 ng0@*
-Copyright @copyright{} 2016 Jan Nieuwenhuizen
+Copyright @copyright{} 2016 Jan Nieuwenhuizen@*
+Copyright @copyright{} 2016 Julien Lepiller
 
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -10397,6 +10398,7 @@ The @code{(gnu services web)} module provides the following service:
 @deffn {Scheme Procedure} nginx-service [#:nginx nginx] @
        [#:log-directory ``/var/log/nginx''] @
        [#:run-directory ``/var/run/nginx''] @
+       [#:vhost-list (list (nginx-vhost-configuration))] @
        [#:config-file]
 
 Return a service that runs @var{nginx}, the nginx web server.
@@ -10407,8 +10409,54 @@ files are written to @var{run-directory}.  For proper operation, these
 arguments should match what is in @var{config-file} to ensure that the
 directories are created when the service is activated.
 
+As an alternative to using a @var{config-file}, @var{vhost-list} can be
+used to specify the list of @dfn{virtual hosts} required on the host.  For
+this to work, use the default value for @var{config-file}.
+
 @end deffn
 
+@deftp {Data Type} nginx-vhost-configuration
+Data type representing the configuration of an nginx virtual host.
+This type has the following parameters:
+
+@table @asis
+@item @code{http-port} (default: @code{80})
+Nginx will listen for HTTP connection on this port.  Set it at @code{#f} if
+nginx should not listen for HTTP (non secure) connection for this
+@dfn{virtual host}.
+
+@item @code{https-port} (default: @code{443})
+Nginx will listen for HTTPS connection on this port.  Set it at @code{#f} if
+nginx should not listen for HTTPS (secure) connection for this @dfn{virtual host}.
+
+Note that nginx can listen for HTTP and HTTPS connections in the same
+@dfn{virtual host}.
+
+@item @code{server-name} (default: @code{(list 'default)})
+A list of server names this vhost represents. @code{'default} represents the
+default vhost for connections matching no other vhost.
+
+@item @code{root} (default: @code{"/srv/http"})
+Root of the website nginx will serve.
+
+@item @code{index} (default: @code{(list "index.html")})
+Index files to look for when clients ask for a directory.  If it cannot be found,
+Nginx will send the list of files in the directory.
+
+@item @code{ssl-certificate} (default: @code{"/etc/nginx/cert.pem"})
+Where to find the certificate for secure connections.  Set it to @code{#f} if
+you don't have a certificate or you don't want to use HTTPS.
+
+@item @code{ssl-certificate-key} (default: @code{"/etc/nginx/key.pem"})
+Where to find the private key for secure connections.  Set it to @code{#f} if
+you don't have a key or you don't want to use HTTPS.
+
+@item @code{server-tokens?} (default: @code{#f})
+Whether the server should add its configuration to response.
+
+@end table
+@end deftp
+
 @node Network File System
 @subsubsection Network File System
 @cindex NFS

gnu/services/web.scm

@@ -2,6 +2,7 @@
 ;;; Copyright © 2015 David Thompson <davet@gnu.org>
 ;;; Copyright © 2015, 2016 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2016 ng0 <ng0@we.make.ritual.n0.is>
+;;; Copyright © 2016 Julien Lepiller <julien@lepiller.eu>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -29,6 +30,8 @@
   #:use-module (ice-9 match)
   #:export (nginx-configuration
             nginx-configuration?
+            nginx-vhost-configuration
+            nginx-vhost-configuration?
             nginx-service
             nginx-service-type))
 
@@ -38,6 +41,26 @@
 ;;;
 ;;; Code:
 
+(define-record-type* <nginx-vhost-configuration>
+  nginx-vhost-configuration make-nginx-vhost-configuration
+  nginx-vhost-configuration?
+  (http-port           nginx-vhost-configuration-http-port
+                       (default 80))
+  (https-port          nginx-vhost-configuration-https-port
+                       (default 443))
+  (server-name         nginx-vhost-configuration-server-name
+                       (default (list 'default)))
+  (root                nginx-vhost-configuration-root
+                       (default "/srv/http"))
+  (index               nginx-vhost-configuration-index
+                       (default (list "index.html")))
+  (ssl-certificate     nginx-vhost-configuration-ssl-certificate
+                       (default "/etc/nginx/cert.pem"))
+  (ssl-certificate-key nginx-vhost-configuration-ssl-certificate-key
+                       (default "/etc/nginx/key.pem"))
+  (server-tokens?      nginx-vhost-configuration-server-tokens?
+                       (default #f)))
+
 (define-record-type* <nginx-configuration>
   nginx-configuration make-nginx-configuration
   nginx-configuration?
@@ -46,16 +69,70 @@
   (run-directory nginx-configuration-run-directory) ;string
   (file          nginx-configuration-file))         ;string | file-like
 
-(define (default-nginx-config log-directory run-directory)
+(define (config-domain-strings names)
+ "Return a string denoting the nginx config representation of NAMES, a list
+of domain names."
+ (string-concatenate
+  (map (match-lambda
+        ('default "_")
+        ((? string? str) str))
+       names)))
+
+(define (config-index-strings names)
+ "Return a string denoting the nginx config representation of NAMES, a list
+of index files."
+ (string-concatenate
+  (map (match-lambda
+        ((? string? str) str))
+       names)))
+
+(define (default-nginx-vhost-config vhost)
+  (string-append
+   "    server {\n"
+   (if (nginx-vhost-configuration-http-port vhost)
+       (string-append "      listen "
+                      (number->string (nginx-vhost-configuration-http-port vhost))
+                      ";\n")
+       "")
+   (if (nginx-vhost-configuration-https-port vhost)
+       (string-append "      listen "
+                      (number->string (nginx-vhost-configuration-https-port vhost))
+                      " ssl;\n")
+       "")
+   "      server_name " (config-domain-strings
+                         (nginx-vhost-configuration-server-name vhost))
+                        ";\n"
+   (if (nginx-vhost-configuration-ssl-certificate vhost)
+       (string-append "      ssl_certificate "
+                      (nginx-vhost-configuration-ssl-certificate vhost) ";\n")
+       "")
+   (if (nginx-vhost-configuration-ssl-certificate-key vhost)
+       (string-append "      ssl_certificate_key "
+                      (nginx-vhost-configuration-ssl-certificate-key vhost) ";\n")
+       "")
+   "      root " (nginx-vhost-configuration-root vhost) ";\n"
+   "      index " (config-index-strings (nginx-vhost-configuration-index vhost)) ";\n"
+   "      server_tokens " (if (nginx-vhost-configuration-server-tokens? vhost)
+                              "on" "off") ";\n"
+   "    }\n"))
+
+(define (default-nginx-config log-directory run-directory vhost-list)
   (plain-file "nginx.conf"
               (string-append
                "user nginx nginx;\n"
                "pid " run-directory "/pid;\n"
                "error_log " log-directory "/error.log info;\n"
                "http {\n"
+               "    client_body_temp_path " run-directory "/client_body_temp;\n"
+               "    proxy_temp_path " run-directory "/proxy_temp;\n"
+               "    fastcgi_temp_path " run-directory "/fastcgi_temp;\n"
+               "    uwsgi_temp_path " run-directory "/uwsgi_temp;\n"
+               "    scgi_temp_path " run-directory "/scgi_temp;\n"
                "    access_log " log-directory "/access.log;\n"
-               "    root /var/www;\n"
+               (let ((http (map default-nginx-vhost-config vhost-list)))
-               "    server {}\n"
+                 (do ((http http (cdr http))
+                      (block "" (string-append (car http) "\n" block )))
+                     ((null? http) block)))
                "}\n"
                "events {}\n")))
 
@@ -79,6 +156,12 @@
          (mkdir-p #$log-directory)
          (format #t "creating nginx run directory '~a'~%" #$run-directory)
          (mkdir-p #$run-directory)
+         (format #t "creating nginx temp directories '~a/{client_body,proxy,fastcgi,uwsgi,scgi}_temp'~%" #$run-directory)
+         (mkdir-p (string-append #$run-directory "/client_body_temp"))
+         (mkdir-p (string-append #$run-directory "/proxy_temp"))
+         (mkdir-p (string-append #$run-directory "/fastcgi_temp"))
+         (mkdir-p (string-append #$run-directory "/uwsgi_temp"))
+         (mkdir-p (string-append #$run-directory "/scgi_temp"))
          ;; Check configuration file syntax.
          (system* (string-append #$nginx "/sbin/nginx")
                   "-c" #$config-file "-t")))))
@@ -114,8 +197,9 @@
 (define* (nginx-service #:key (nginx nginx)
                         (log-directory "/var/log/nginx")
                         (run-directory "/var/run/nginx")
+                        (vhost-list (list (nginx-vhost-configuration)))
                         (config-file
-                         (default-nginx-config log-directory run-directory)))
+                         (default-nginx-config log-directory run-directory vhost-list)))
   "Return a service that runs NGINX, the nginx web server.
 
 The nginx daemon loads its runtime configuration from CONFIG-FILE, stores log