{ stdenv, fetchurl, writeText, checkEnv, phpPackages, php, which }:
let
  wallabag = rec {
    varDir = "/var/lib/wallabag";
    parameters =
      assert checkEnv "NIXOPS_WALLABAG_SQL_PASSWORD";
      assert checkEnv "NIXOPS_WALLABAG_SECRET";
      assert checkEnv "NIXOPS_WALLABAG_LDAP_PASSWORD";
    writeText "parameters.yml" ''
      # This file is auto-generated during the composer install
      parameters:
          database_driver: pdo_pgsql
          database_driver_class: Wallabag\CoreBundle\Doctrine\DBAL\Driver\CustomPostgreSQLDriver
          database_host: db-1.immae.eu
          database_port: null
          database_name: webapps
          database_user: wallabag
          database_password: ${builtins.getEnv "NIXOPS_WALLABAG_SQL_PASSWORD"}
          database_path: null
          database_table_prefix: wallabag_
          database_socket: null
          database_charset: utf8
          domain_name: https://tools.immae.eu/wallabag
          mailer_transport: smtp
          mailer_host: mail.immae.eu
          mailer_user: null
          mailer_password: null
          locale: fr
          secret: ${builtins.getEnv "NIXOPS_WALLABAG_SECRET"}
          twofactor_auth: true
          twofactor_sender: wallabag@immae.eu
          fosuser_registration: false
          fosuser_confirmation: true
          from_email: wallabag@immae.eu
          rss_limit: 50
          rabbitmq_host: localhost
          rabbitmq_port: 5672
          rabbitmq_user: guest
          rabbitmq_password: guest
          rabbitmq_prefetch_count: 10
          redis_scheme: tcp
          redis_host: localhost
          redis_port: 6379
          redis_path: null
          redis_password: null
          sites_credentials: {  }
          ldap_enabled: true
          ldap_host: ldap.immae.eu
          ldap_port: 636
          ldap_tls: false
          ldap_ssl: true
          ldap_bind_requires_dn: true
          ldap_base: 'dc=immae,dc=eu'
          ldap_manager_dn: 'cn=wallabag,ou=services,dc=immae,dc=eu'
          ldap_manager_pw: ${builtins.getEnv "NIXOPS_WALLABAG_LDAP_PASSWORD"}
          ldap_filter: '(&(memberOf=cn=users,cn=wallabag,ou=services,dc=immae,dc=eu))'
          ldap_admin_filter: '(&(memberOf=cn=admins,cn=wallabag,ou=services,dc=immae,dc=eu)(uid=%s))'
          ldap_username_attribute: uid
          ldap_email_attribute: mail
          ldap_name_attribute: cn
          ldap_enabled_attribute: null
      '';
    webappDir = stdenv.mkDerivation rec {
      # Beware when upgrading, I probably messed up with the migrations table
      # (due to a psql bug in wallabag)
      version = "2.3.2";
      name = "wallabag-${version}";
      src = fetchurl {
        url = "https://static.wallabag.org/releases/wallabag-release-${version}.tar.gz";
        sha256 = "17yczdvgl43j6wa7hksxi2b51afvyd56vdya6hbbv68iiba4jyh4";
      };
      patches = [ ./wallabag_ldap.patch ];
      dontBuild = "true";
      installPhase = ''
        cp -a . $out
        cd $out
        export SYMFONY_ENV=prod
        php -d memory_limit=-1 ${phpPackages.composer}/libexec/composer/composer.phar require --update-no-dev -o --prefer-dist fr3d/ldap-bundle
        rm -rf web/assets var/cache app/config/parameters.yml data
        mv var var_old
        ln -sf ${parameters} app/config/parameters.yml
        ln -sf ../../../../../${varDir}/var var
        ln -sf ../../../../../${varDir}/data data
        ln -sf ../../../../../../${varDir}/assets web/assets
      '';
      buildInputs = [ php phpPackages.composer ];
    };
    activationScript = ''
      install -m 0755 -o ${apache.user} -g ${apache.group} -d ${varDir} \
        ${varDir}/var ${varDir}/data/db ${varDir}/assets/images
      if [ ! -f "${varDir}/currentWebappDir" -o \
          "${webappDir}" != "$(cat ${varDir}/currentWebappDir 2>/dev/null)" ]; then
        pushd ${webappDir} > /dev/null
        $wrapperDir/sudo -u wwwrun ./bin/console --env=prod doctrine:migrations:migrate --no-interaction
        $wrapperDir/sudo -u wwwrun ./bin/console --env=prod cache:clear
        popd > /dev/null
        echo -n "${webappDir}" > ${varDir}/currentWebappDir
      fi
      '';
    webRoot = "${webappDir}/web";
    apache = {
      user = "wwwrun";
      group = "wwwrun";
      modules = [ "proxy_fcgi" ];
      vhostConf = ''
        # FIXME
        Alias /assets "${varDir}/assets"
        Alias /wallabag "${webRoot}"
        <Directory "${webRoot}">
          AllowOverride None
          Require all granted
          # For OAuth (apps)
          CGIPassAuth On

          <FilesMatch "\.php$">
            SetHandler "proxy:unix:${phpFpm.socket}|fcgi://localhost"
          </FilesMatch>

          <IfModule mod_rewrite.c>
            Options -MultiViews
            RewriteEngine On
            RewriteCond %{REQUEST_FILENAME} !-f
            RewriteRule ^(.*)$ app.php [QSA,L]
          </IfModule>
        </Directory>
        <Directory "${webRoot}/bundles">
          <IfModule mod_rewrite.c>
            RewriteEngine Off
          </IfModule>
        </Directory>
        <Directory "${varDir}/assets">
          AllowOverride None
          Require all granted
        </Directory>
        '';
    };
    phpFpm = rec {
      basedir = builtins.concatStringsSep ":" [ webappDir parameters varDir ];
      socket = "/var/run/phpfpm/wallabag.sock";
      pool = ''
        listen = ${socket}
        user = ${apache.user}
        group = ${apache.group}
        listen.owner = ${apache.user}
        listen.group = ${apache.group}
        pm = dynamic
        pm.max_children = 60
        pm.start_servers = 2
        pm.min_spare_servers = 1
        pm.max_spare_servers = 10

        ; Needed to avoid clashes in browser cookies (same domain)
        php_value[session.name] = WallabagPHPSESSID
        php_admin_value[open_basedir] = "${basedir}:/tmp"
        php_value[max_execution_time] = 300
        '';
    };
  };
in
  wallabag