{ stdenv, fetchurl, env, writeText, lib, phpPackages, php }:
let
  nextcloud = let
    buildApp = { appName, version, url, sha256, installPhase ? "mkdir -p $out && cp -R . $out/" }:
      stdenv.mkDerivation rec {
        name = "nextcloud-app-${appName}-${version}";
        inherit version;
        phases = "unpackPhase installPhase";
        inherit installPhase;
        src = fetchurl { inherit url sha256; };
      };
    apps = {
      audioplayer = buildApp rec {
        appName = "audioplayer";
        version = "2.6.0";
        url = "https://github.com/Rello/${appName}/releases/download/${version}/${appName}-${version}.tar.gz";
        sha256 = "08apm7dhnljagcvq8b1dsqcck4nqwmz60bf3mx44xvbhiaq6nim4";
      };
      bookmarks = buildApp rec {
        appName = "bookmarks";
        version = "0.16.2";
        url = "https://github.com/nextcloud/${appName}/releases/download/v${version}/${appName}-${version}.tar.gz";
        sha256 = "0ghk71iyk5xlqsfahg0d0lpp9lparpdnv2qx11a7j64pc9gzcfl4";
      };
      calendar = buildApp rec {
        appName = "calendar";
        version = "1.6.4";
        url = "https://github.com/nextcloud/${appName}/releases/download/v${version}/${appName}.tar.gz";
        sha256 = "00dijvcvy7snsjslfbyzvpp9anhms22zp1f0zkj89ln33jmana63";
      };
      contacts = buildApp rec {
        appName = "contacts";
        version = "3.0.3";
        url = "https://github.com/nextcloud/${appName}/releases/download/v${version}/${appName}.tar.gz";
        sha256 = "026hfigfzqb1cvq6a7mg9656nkm21c19a6ipqzgv00ycf38qyk95";
      };
      deck = buildApp rec {
        appName = "deck";
        version = "0.5.2";
        url = "https://github.com/nextcloud/${appName}/releases/download/v${version}/${appName}.tar.gz";
        sha256 = "1kygzixxdkp3dbma009p3pw0fj8wgcqcv39n7pay78lh6zi3nic7";
      };
      files_markdown = buildApp rec {
        appName = "files_markdown";
        version = "2.0.5";
        url = "https://github.com/icewind1991/${appName}/releases/download/v${version}/${appName}.tar.gz";
        sha256 = "1dzvy4c6vff2qmkwqw13dx92xdkafaxgnipswjw44mh0ncc2n9ym";
      };
      gpxedit = buildApp rec {
        appName = "gpxedit";
        version = "0.0.10";
        url = "https://gitlab.com/eneiluj/gpxedit-oc/wikis/uploads/33d187268c5f6f6a55350d656305701c/${appName}-${version}.tar.gz";
        sha256 = "0ynpaxm0xhvcj8xax6rm1w0p6j57wbqidhi7bhn268n483gwl2sw";
      };
      gpxpod = buildApp rec {
        appName = "gpxpod";
        version = "3.0.1";
        url = "https://gitlab.com/eneiluj/gpxpod-oc/wikis/uploads/3f5fbc895de15f11f90582c4872839dc/${appName}-${version}.tar.gz";
        sha256 = "1g3602phrdpybamr4bnk5niv1znmwp19lqyw6d8yxmc84lg99dny";
      };
      keeweb = buildApp rec {
        appName = "keeweb";
        version = "0.4.0";
        url = "https://github.com/jhass/nextcloud-keeweb/releases/download/v${version}/${appName}-${version}.tar.gz";
        sha256 = "0453kkb0a8vfivmibpwpx4bvhyn64jhns6cdfjacmnvbm6d75nj1";
        installPhase = ''
          mkdir -p $out
          cp -R . $out/
          sed -i -e 's/max-version="12"/max-version="16"/' $out/appinfo/info.xml
        '';
      };
      music = buildApp rec {
        appName = "music";
        version = "0.9.3";
        url = "https://github.com/owncloud/${appName}/archive/v${version}.tar.gz";
        sha256 = "1x4c2v8hnm9yi3fzjglfwd2brzn99v8zavgfczc5jfj30v3n555z";
      };
      notes = buildApp rec {
        appName = "notes";
        version = "2.5.1";
        url = "https://github.com/nextcloud/${appName}/releases/download/v${version}/${appName}.tar.gz";
        sha256 = "1albzqqsdirzyw8vhvs7r0qm2wqp8vm9vmxm4crhncd85bk01hmh";
      };
      ocsms = buildApp rec {
        appName = "ocsms";
        version = "2.1.1";
        url = "https://github.com/nextcloud/${appName}/releases/download/${version}/${appName}-${version}.tar.gz";
        sha256 = "0sgfbmy1c8rgzjvf9snc7rzgp8aqsc65zfwgi6qcsf2g6gam5n7a";
        installPhase = ''
          sed -i -e "/addScript.*devel/d" -e "s@//\(.*addScript.*app.min\)@\1@" templates/main.php
          mkdir -p $out
          cp -R . $out/
          '';
      };
      passman = buildApp rec {
        appName = "passman";
        version = "2.2.1";
        url = "https://releases.passman.cc/${appName}_${version}.tar.gz";
        sha256 = "064pq9d0pl3y1vcywpi19fg47zy7j4h0jaxy6jklwzwcrmzagbka";
      };
      spreed = buildApp rec {
        appName = "spreed";
        version = "5.0.2";
        url = "https://github.com/nextcloud/${appName}/releases/download/v${version}/${appName}-${version}.tar.gz";
        sha256 = "0z9zhpkq485lhwirc2f04427rd47hzv0r8frz72dkrszb037qjvv";
      };
      tasks = buildApp rec {
        appName = "tasks";
        version = "0.9.8";
        url = "https://github.com/nextcloud/${appName}/releases/download/v${version}/${appName}.tar.gz";
        sha256 = "089m124lfsfk09fqj50x9n7zndq97jp5afgb8s001rpmzym4g6ny";
      };
    };
  in rec {
    varDir = "/var/lib/nextcloud";
    config_php = writeText "config.php" ''
      <?php
      $CONFIG = array (
        // FIXME: change this value when nextcloud starts getting slow
        'instanceid' => '${env.instance_id}1',
        'datadirectory' => '/var/lib/nextcloud/',
        'passwordsalt' => '${env.password_salt}',
        'debug' => false,
        'dbtype' => 'pgsql',
        'version' => '15.0.0.10',
        'dbname' => '${env.postgresql.database}',
        'dbhost' => '${env.postgresql.socket}',
        'dbtableprefix' => 'oc_',
        'dbuser' => '${env.postgresql.user}',
        'dbpassword' => '${env.postgresql.password}',
        'installed' => true,
        'maxZipInputSize' => 0,
        'allowZipDownload' => true,
        'forcessl' => true,
        'theme' => ${"''"},
        'maintenance' => false,
        'trusted_domains' =>
        array (
          0 => 'cloud.immae.eu',
        ),
        'secret' => '${env.secret}',
        'appstoreenabled' => false,
        'appstore.experimental.enabled' => true,
        'loglevel' => 2,
        'trashbin_retention_obligation' => 'auto',
        'htaccess.RewriteBase' => '/',
        'mail_smtpmode' => 'sendmail',
        'mail_smtphost' => '127.0.0.1',
        'mail_smtpname' => ''',
        'mail_smtppassword' => ''',
        'mail_from_address' => 'owncloud',
        'mail_smtpauth' => false,
        'mail_domain' => 'immae.eu',
        'memcache.local' => '\\OC\\Memcache\\APCu',
        'memcache.locking' => '\\OC\\Memcache\\Redis',
        'filelocking.enabled' => true,
        'redis' =>
        array (
          'host' => '${env.redis.socket}',
          'port' => 0,
          'dbindex' => ${env.redis.db_index},
        ),
        'overwrite.cli.url' => 'https://cloud.immae.eu',
        'ldapIgnoreNamingRules' => false,
        'ldapProviderFactory' => '\\OCA\\User_LDAP\\LDAPProviderFactory',
      );
      '';
    config = stdenv.mkDerivation rec {
      name = "nextcloud-config";
      src = ./nextcloud-config;
      phases = "installPhase";
      installPhase = ''
        mkdir -p $out
        cp -r $src/* $out
        cp ${config_php} $out/config.php
      '';
    };
    webRoot = stdenv.mkDerivation rec {
      name = "nextcloud-${version}";
      version = "15.0.4";

      src = fetchurl {
        url = "https://download.nextcloud.com/server/releases/${name}.tar.bz2";
        sha256 = "0xwg7p31y1pkjk1pzygh9shpqxnfkafrab52j7in7xblq53v0zgq";
      };

      installPhase = ''
        mkdir -p $out/
        cp -R . $out/
        rm -r $out/config
        ln -sf ../../../../../${varDir}/config $out/config
        ${builtins.concatStringsSep "\n" (
          lib.attrsets.mapAttrsToList (name: value: "ln -sf ${value} $out/apps/${name}") apps
        )}
      '';

      meta = {
        description = "Sharing solution for files, calendars, contacts and more";
        homepage = https://nextcloud.com;
        maintainers = with lib.maintainers; [ schneefux bachp globin fpletz ];
        license = lib.licenses.agpl3Plus;
        platforms = with lib.platforms; unix;
      };
    };
    activationScript = {
      deps = [ ];
      text = ''
        install -m 0755 -o ${apache.user} -g ${apache.group} -d ${varDir}
        install -m 0750 -o ${apache.user} -g ${apache.group} -d ${varDir}/phpSessions
        if [ ! -e ${varDir}/config ]; then
          cp -a ${config} ${varDir}/config
          chown -R ${apache.user}:${apache.group} ${varDir}/config
          chmod -R u+w ${varDir}/config
        fi
      '';
    };
    apache = {
      user = "wwwrun";
      group = "wwwrun";
      modules = [ "proxy_fcgi" ];
      vhostConf = ''
        SetEnvIf Authorization "(.*)" HTTP_AUTHORIZATION=$1
        <Directory ${webRoot}>
          AcceptPathInfo On
          DirectoryIndex index.php
          Options FollowSymlinks
          Require all granted
          AllowOverride all

          <IfModule mod_headers.c>
            Header always set Strict-Transport-Security "max-age=15552000; includeSubDomains; preload"
          </IfModule>
          <FilesMatch "\.php$">
            CGIPassAuth on
            SetHandler "proxy:unix:${phpFpm.socket}|fcgi://localhost"
          </FilesMatch>

        </Directory>

        '';
    };
    phpFpm = rec {
      basedir = builtins.concatStringsSep ":" (
        [ webRoot varDir config ]
        ++ lib.attrsets.mapAttrsToList (name: value: value) apps);
      socket = "/var/run/phpfpm/nextcloud.sock";
      phpConfig = ''
        extension=${phpPackages.redis}/lib/php/extensions/redis.so
        extension=${phpPackages.apcu}/lib/php/extensions/apcu.so
        zend_extension=${php}/lib/php/extensions/opcache.so
        '';
      pool = ''
        listen = ${socket}
        user = ${apache.user}
        group = ${apache.group}
        listen.owner = ${apache.user}
        listen.group = ${apache.group}
        pm = ondemand
        pm.max_children = 60
        pm.process_idle_timeout = 60

        php_admin_value[output_buffering] = 0
        php_admin_value[max_execution_time] = 1800
        php_admin_value[zend_extension] = "opcache"
        ;already enabled by default?
        ;php_value[opcache.enable] = 1
        php_value[opcache.enable_cli] = 1
        php_value[opcache.interned_strings_buffer] = 8
        php_value[opcache.max_accelerated_files] = 10000
        php_value[opcache.memory_consumption] = 128
        php_value[opcache.save_comments] = 1
        php_value[opcache.revalidate_freq] = 1
        php_admin_value[memory_limit] = 512M

        php_admin_value[open_basedir] = "/run/wrappers/bin/sendmail:${basedir}:/proc/meminfo:/dev/urandom:/proc/self/fd:/tmp"
        php_admin_value[session.save_path] = "${varDir}/phpSessions"
        '';
    };
  };
in
  nextcloud