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nixpkgs/nixos/modules/services/web-apps/wordpress.nix
2020-04-18 14:04:37 +02:00

367 lines
13 KiB
Nix

{ config, pkgs, lib, ... }:
let
inherit (lib) mkDefault mkEnableOption mkForce mkIf mkMerge mkOption types;
inherit (lib) any attrValues concatMapStringsSep flatten literalExample;
inherit (lib) mapAttrs mapAttrs' mapAttrsToList nameValuePair optional optionalAttrs optionalString;
eachSite = config.services.wordpress;
user = "wordpress";
group = config.services.httpd.group;
stateDir = hostName: "/var/lib/wordpress/${hostName}";
pkg = hostName: cfg: pkgs.stdenv.mkDerivation rec {
pname = "wordpress-${hostName}";
version = src.version;
src = cfg.package;
installPhase = ''
mkdir -p $out
cp -r * $out/
# symlink the wordpress config
ln -s ${wpConfig hostName cfg} $out/share/wordpress/wp-config.php
# symlink uploads directory
ln -s ${cfg.uploadsDir} $out/share/wordpress/wp-content/uploads
# https://github.com/NixOS/nixpkgs/pull/53399
#
# Symlinking works for most plugins and themes, but Avada, for instance, fails to
# understand the symlink, causing its file path stripping to fail. This results in
# requests that look like: https://example.com/wp-content//nix/store/...plugin/path/some-file.js
# Since hard linking directories is not allowed, copying is the next best thing.
# copy additional plugin(s) and theme(s)
${concatMapStringsSep "\n" (theme: "cp -r ${theme} $out/share/wordpress/wp-content/themes/${theme.name}") cfg.themes}
${concatMapStringsSep "\n" (plugin: "cp -r ${plugin} $out/share/wordpress/wp-content/plugins/${plugin.name}") cfg.plugins}
'';
};
wpConfig = hostName: cfg: pkgs.writeText "wp-config-${hostName}.php" ''
<?php
define('DB_NAME', '${cfg.database.name}');
define('DB_HOST', '${cfg.database.host}:${if cfg.database.socket != null then cfg.database.socket else toString cfg.database.port}');
define('DB_USER', '${cfg.database.user}');
${optionalString (cfg.database.passwordFile != null) "define('DB_PASSWORD', file_get_contents('${cfg.database.passwordFile}'));"}
define('DB_CHARSET', 'utf8');
$table_prefix = '${cfg.database.tablePrefix}';
require_once('${stateDir hostName}/secret-keys.php');
# wordpress is installed onto a read-only file system
define('DISALLOW_FILE_EDIT', true);
define('AUTOMATIC_UPDATER_DISABLED', true);
${cfg.extraConfig}
if ( !defined('ABSPATH') )
define('ABSPATH', dirname(__FILE__) . '/');
require_once(ABSPATH . 'wp-settings.php');
?>
'';
secretsVars = [ "AUTH_KEY" "SECURE_AUTH_KEY" "LOOGGED_IN_KEY" "NONCE_KEY" "AUTH_SALT" "SECURE_AUTH_SALT" "LOGGED_IN_SALT" "NONCE_SALT" ];
secretsScript = hostStateDir: ''
if ! test -e "${hostStateDir}/secret-keys.php"; then
umask 0177
echo "<?php" >> "${hostStateDir}/secret-keys.php"
${concatMapStringsSep "\n" (var: ''
echo "define('${var}', '`tr -dc a-zA-Z0-9 </dev/urandom | head -c 64`');" >> "${hostStateDir}/secret-keys.php"
'') secretsVars}
echo "?>" >> "${hostStateDir}/secret-keys.php"
chmod 440 "${hostStateDir}/secret-keys.php"
fi
'';
siteOpts = { lib, name, ... }:
{
options = {
package = mkOption {
type = types.package;
default = pkgs.wordpress;
description = "Which WordPress package to use.";
};
uploadsDir = mkOption {
type = types.path;
default = "/var/lib/wordpress/${name}/uploads";
description = ''
This directory is used for uploads of pictures. The directory passed here is automatically
created and permissions adjusted as required.
'';
};
plugins = mkOption {
type = types.listOf types.path;
default = [];
description = ''
List of path(s) to respective plugin(s) which are copied from the 'plugins' directory.
<note><para>These plugins need to be packaged before use, see example.</para></note>
'';
example = ''
# Wordpress plugin 'embed-pdf-viewer' installation example
embedPdfViewerPlugin = pkgs.stdenv.mkDerivation {
name = "embed-pdf-viewer-plugin";
# Download the theme from the wordpress site
src = pkgs.fetchurl {
url = "https://downloads.wordpress.org/plugin/embed-pdf-viewer.2.0.3.zip";
sha256 = "1rhba5h5fjlhy8p05zf0p14c9iagfh96y91r36ni0rmk6y891lyd";
};
# We need unzip to build this package
buildInputs = [ pkgs.unzip ];
# Installing simply means copying all files to the output directory
installPhase = "mkdir -p $out; cp -R * $out/";
};
And then pass this theme to the themes list like this:
plugins = [ embedPdfViewerPlugin ];
'';
};
themes = mkOption {
type = types.listOf types.path;
default = [];
description = ''
List of path(s) to respective theme(s) which are copied from the 'theme' directory.
<note><para>These themes need to be packaged before use, see example.</para></note>
'';
example = ''
# Let's package the responsive theme
responsiveTheme = pkgs.stdenv.mkDerivation {
name = "responsive-theme";
# Download the theme from the wordpress site
src = pkgs.fetchurl {
url = "https://downloads.wordpress.org/theme/responsive.3.14.zip";
sha256 = "0rjwm811f4aa4q43r77zxlpklyb85q08f9c8ns2akcarrvj5ydx3";
};
# We need unzip to build this package
buildInputs = [ pkgs.unzip ];
# Installing simply means copying all files to the output directory
installPhase = "mkdir -p $out; cp -R * $out/";
};
And then pass this theme to the themes list like this:
themes = [ responsiveTheme ];
'';
};
database = {
host = mkOption {
type = types.str;
default = "localhost";
description = "Database host address.";
};
port = mkOption {
type = types.port;
default = 3306;
description = "Database host port.";
};
name = mkOption {
type = types.str;
default = "wordpress";
description = "Database name.";
};
user = mkOption {
type = types.str;
default = "wordpress";
description = "Database user.";
};
passwordFile = mkOption {
type = types.nullOr types.path;
default = null;
example = "/run/keys/wordpress-dbpassword";
description = ''
A file containing the password corresponding to
<option>database.user</option>.
'';
};
tablePrefix = mkOption {
type = types.str;
default = "wp_";
description = ''
The $table_prefix is the value placed in the front of your database tables.
Change the value if you want to use something other than wp_ for your database
prefix. Typically this is changed if you are installing multiple WordPress blogs
in the same database.
See <link xlink:href='https://codex.wordpress.org/Editing_wp-config.php#table_prefix'/>.
'';
};
socket = mkOption {
type = types.nullOr types.path;
default = null;
defaultText = "/run/mysqld/mysqld.sock";
description = "Path to the unix socket file to use for authentication.";
};
createLocally = mkOption {
type = types.bool;
default = true;
description = "Create the database and database user locally.";
};
};
virtualHost = mkOption {
type = types.submodule (import ../web-servers/apache-httpd/vhost-options.nix);
example = literalExample ''
{
adminAddr = "webmaster@example.org";
forceSSL = true;
enableACME = true;
}
'';
description = ''
Apache configuration can be done by adapting <option>services.httpd.virtualHosts</option>.
'';
};
poolConfig = mkOption {
type = with types; attrsOf (oneOf [ str int bool ]);
default = {
"pm" = "dynamic";
"pm.max_children" = 32;
"pm.start_servers" = 2;
"pm.min_spare_servers" = 2;
"pm.max_spare_servers" = 4;
"pm.max_requests" = 500;
};
description = ''
Options for the WordPress PHP pool. See the documentation on <literal>php-fpm.conf</literal>
for details on configuration directives.
'';
};
extraConfig = mkOption {
type = types.lines;
default = "";
description = ''
Any additional text to be appended to the wp-config.php
configuration file. This is a PHP script. For configuration
settings, see <link xlink:href='https://codex.wordpress.org/Editing_wp-config.php'/>.
'';
example = ''
define( 'AUTOSAVE_INTERVAL', 60 ); // Seconds
'';
};
};
config.virtualHost.hostName = mkDefault name;
};
in
{
# interface
options = {
services.wordpress = mkOption {
type = types.attrsOf (types.submodule siteOpts);
default = {};
description = "Specification of one or more WordPress sites to serve via Apache.";
};
};
# implementation
config = mkIf (eachSite != {}) {
assertions = mapAttrsToList (hostName: cfg:
{ assertion = cfg.database.createLocally -> cfg.database.user == user;
message = "services.wordpress.${hostName}.database.user must be ${user} if the database is to be automatically provisioned";
}
) eachSite;
services.mysql = mkIf (any (v: v.database.createLocally) (attrValues eachSite)) {
enable = true;
package = mkDefault pkgs.mariadb;
ensureDatabases = mapAttrsToList (hostName: cfg: cfg.database.name) eachSite;
ensureUsers = mapAttrsToList (hostName: cfg:
{ name = cfg.database.user;
ensurePermissions = { "${cfg.database.name}.*" = "ALL PRIVILEGES"; };
}
) eachSite;
};
services.phpfpm.pools = mapAttrs' (hostName: cfg: (
nameValuePair "wordpress-${hostName}" {
inherit user group;
settings = {
"listen.owner" = config.services.httpd.user;
"listen.group" = config.services.httpd.group;
} // cfg.poolConfig;
}
)) eachSite;
services.httpd = {
enable = true;
extraModules = [ "proxy_fcgi" ];
virtualHosts = mapAttrs (hostName: cfg: mkMerge [ cfg.virtualHost {
documentRoot = mkForce "${pkg hostName cfg}/share/wordpress";
extraConfig = ''
<Directory "${pkg hostName cfg}/share/wordpress">
<FilesMatch "\.php$">
<If "-f %{REQUEST_FILENAME}">
SetHandler "proxy:unix:${config.services.phpfpm.pools."wordpress-${hostName}".socket}|fcgi://localhost/"
</If>
</FilesMatch>
# standard wordpress .htaccess contents
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
DirectoryIndex index.php
Require all granted
Options +FollowSymLinks
</Directory>
# https://wordpress.org/support/article/hardening-wordpress/#securing-wp-config-php
<Files wp-config.php>
Require all denied
</Files>
'';
} ]) eachSite;
};
systemd.tmpfiles.rules = flatten (mapAttrsToList (hostName: cfg: [
"d '${stateDir hostName}' 0750 ${user} ${group} - -"
"d '${cfg.uploadsDir}' 0750 ${user} ${group} - -"
"Z '${cfg.uploadsDir}' 0750 ${user} ${group} - -"
]) eachSite);
systemd.services = mkMerge [
(mapAttrs' (hostName: cfg: (
nameValuePair "wordpress-init-${hostName}" {
wantedBy = [ "multi-user.target" ];
before = [ "phpfpm-wordpress-${hostName}.service" ];
after = optional cfg.database.createLocally "mysql.service";
script = secretsScript (stateDir hostName);
serviceConfig = {
Type = "oneshot";
User = user;
Group = group;
};
})) eachSite)
(optionalAttrs (any (v: v.database.createLocally) (attrValues eachSite)) {
httpd.after = [ "mysql.service" ];
})
];
users.users.${user} = {
group = group;
isSystemUser = true;
};
};
}