#! /usr/bin/env bash

# More info at: https://github.com/elitak/nixos-infect

set -e -o pipefail

makeConf() {
  export HASHED_PASSWORD=$( mkpasswd -m sha-512 "$PASSWORD" )
  # Skip everything if main config already present
  [[ -e /etc/nixos/configuration.nix ]] && return 0
  # NB <<"EOF" quotes / $ ` in heredocs, <<EOF does not
  mkdir /etc/nixos
  mkdir -p /etc/nixos/mailserver/system
  mkdir /etc/nixos/mailserver/userdata
  mkdir /etc/nixos/api
  mkdir /etc/nixos/social
  mkdir /etc/nixos/letsencrypt
  mkdir /etc/nixos/backup
  mkdir /etc/nixos/passmgr
  mkdir /etc/nixos/webserver
  mkdir /etc/nixos/git
  mkdir /etc/nixos/nextcloud
  mkdir /etc/nixos/resources
  mkdir /etc/nixos/videomeet
  mkdir /etc/nixos/vpn

  # Prevent grep for sending error code 1 (and halting execution) when no lines are selected : https://www.unix.com/man-page/posix/1P/grep
  local IFS=$'\n' 
  for trypath in /root/.ssh/authorized_keys $HOME/.ssh/authorized_keys; do 
      [[ -r "$trypath" ]] \
      && keys=$(sed -E 's/^.*((ssh|ecdsa)-[^[:space:]]+)[[:space:]]+([^[:space:]]+)([[:space:]]*.*)$/\1 \3\4/' "$trypath") \
      && break
  done
  local network_import=""

  [[ -n "$doNetConf" ]] && network_import="./networking.nix # generated at runtime by nixos-infect"
  cat > /etc/nixos/configuration.nix << EOF
{ pkgs, lib, ... }: 
{
  imports = [
    ./hardware-configuration.nix
    $network_import
    $NIXOS_IMPORT
    ./files.nix
    ./users.nix
    ./mailserver/system/mailserver.nix
    ./mailserver/system/alps.nix
    ./vpn/ocserv.nix
    ./api/api.nix
    ./api/api-module.nix
    ./social/pleroma.nix
    ./letsencrypt/acme.nix
    ./letsencrypt/resolve.nix
    ./backup/restic.nix
    ./passmgr/bitwarden.nix
    ./webserver/nginx.nix
    ./webserver/memcached.nix
    ./nextcloud/nextcloud.nix
    ./resources/limits.nix
    ./videomeet/jitsi.nix
    ./git/gitea.nix
  ];

  boot.cleanTmpDir = true;
  networking = {
    hostName = "$(hostname)";
    firewall = {
      allowedTCPPorts = lib.mkForce [ 22 25 80 143 443 465 587 993 8443 ];
      allowedUDPPorts = lib.mkForce [ 8443 ];
    };
    nameservers = [ "1.1.1.1" "1.0.0.1" ];
  };
  time.timeZone = "Europe/Uzhgorod";
  i18n.defaultLocale = "en_GB.UTF-8";
  users.users.root.openssh.authorizedKeys.keys = [$(while read -r line; do echo -n "
    \"$line\" "; done <<< "$keys")
  ];
  services.openssh = {
    enable = true;
    passwordAuthentication = true;
    permitRootLogin = "yes";
    openFirewall = false;
  };
  programs.ssh = {
    pubkeyAcceptedKeyTypes = [ "ssh-ed25519" ];
    hostKeyAlgorithms = [ "ssh-ed25519" ];
  };
  environment.systemPackages = with pkgs; [
    git
  ];
  environment.variables = {
    DOMAIN = "$DOMAIN";
  };
  system.autoUpgrade.enable = true;
  system.autoUpgrade.allowReboot = false;
  system.autoUpgrade.channel = https://nixos.org/channels/nixos-21.05-small;
  nix = {
    optimise.automatic = true;
    gc = {
      automatic = true;
      options = "--delete-older-than 7d";
    };
  };
  boot.kernel.sysctl = {
    "net.ipv4.ip_forward" = 1;
  };
  swapDevices = [
    {
      device = "/swapfile";
      priority = 0;
      size = 2048;
    }
  ];
  security = {
    sudo = {
      enable = true;
    };
  };
}
EOF
  # If you rerun this later, be sure to prune the filesSystems attr
    cat > /etc/nixos/hardware-configuration.nix << EOF
{ ... }:
{
  imports = [ <nixpkgs/nixos/modules/profiles/qemu-guest.nix> ];
  boot.loader.grub.device = "$grubdev";
  fileSystems = {
    "/" = { device = "$rootfsdev"; fsType = "ext4"; };
    "/var" = { device = "/dev/sdb"; fsType = "ext4"; };
  };
}
EOF

    cat > /etc/nixos/files.nix << EOF
{ pkgs, ... }:
{
  systemd.tmpfiles.rules =
    let
      nextcloudDBPass = builtins.replaceStrings [ "\n" "\"" "\\\" ] [ "\\\n" "\\\\\"" "\\\\\\\\" ] ''
      $PASSWORD
      '';
      nextcloudAdminPass = builtins.replaceStrings [ "\n" "\"" "\\\" ] [ "\\\n" "\\\\\"" "\\\\\\\\" ] ''
      $PASSWORD
      '';
      resticPass = builtins.replaceStrings [ "\n" "\"" "\\\" ] [ "\\\n" "\\\\\"" "\\\\\\\\" ] ''
      $PASSWORD
      '';
      domain = builtins.replaceStrings [ "\n" "\"" "\\\" ] [ "\\\n" "\\\\\"" "\\\\\\\\" ] ''
      $DOMAIN
      '';
      cloudflareCredentials = builtins.replaceStrings [ "\n" "\"" "\\\" ] [ "\\\n" "\\\\\"" "\\\\\\\\" ] ''
      CF_API_KEY=$CF_TOKEN
      CLOUDFLARE_DNS_API_TOKEN=$CF_TOKEN
      CLOUDFLARE_ZONE_API_TOKEN=$CF_TOKEN
      '';
    in
      [
        "d /var/restic 0660 restic - - -"
        "d /var/bitwarden 0777 bitwarden_rs bitwarden_rs -"
        "d /var/bitwarden/backup 0777 bitwarden_rs bitwarden_rs -"
        "d /var/lib/pleroma 0600 pleroma pleroma - -"
        "f /var/lib/pleroma/secrets.exs 0755 pleroma pleroma - -"
        "f /var/domain 0444 selfprivacy-api selfprivacy-api - \${domain}"
        "f /var/restic/restic-repo-password 0660 restic - - \${resticPass}"
        "f /var/nextcloud-db-pass 0440 nextcloud nextcloud - \${nextcloudDBPass}"
        "f /var/nextcloud-admin-pass 0440 nextcloud nextcloud - \${nextcloudAdminPass}"
        "f /var/cloudflareCredentials.ini 0440 nginx acmerecievers - \${cloudflareCredentials}"
      ];
}
EOF

    cat > /etc/nixos/users.nix << EOF
{ pkgs, ... }:
{
  users.mutableUsers = false;
  users = { 
    users = {
      #begin
      "$LUSER" = {
        isNormalUser = true;
        hashedPassword = "$HASHED_PASSWORD";
      };
      #end
    };
  };
}
EOF

    cat > /etc/nixos/mailserver/system/mailserver.nix << EOF
{ config, pkgs, lib, ... }:
{
  imports = [
    (builtins.fetchTarball {
      # Pick a commit from the branch you are interested in
      url = "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/archive/5675b122/nixos-mailserver-5675b122.tar.gz";

      # And set its hash
      sha256 = "1fwhb7a5v9c98nzhf3dyqf3a5ianqh7k50zizj8v5nmj3blxw4pi";
    })
  ];

  services.dovecot2 = {
    enablePAM = lib.mkForce true;
    showPAMFailure = lib.mkForce true;
  };

  users.users = {
    virtualMail = {
      isNormalUser = false;
    };
  };

  mailserver = {
    enable = true;
    fqdn = "$DOMAIN";
    domains = [ "$DOMAIN" ];

    # A list of all login accounts. To create the password hashes, use
    # mkpasswd -m sha-512 "super secret password"
    loginAccounts = {
      "$LUSER@$DOMAIN" = {
        hashedPassword = "$HASHED_PASSWORD";
        catchAll = [ "$DOMAIN" ];
        sieveScript = ''
          require ["fileinto", "mailbox"];
          if header :contains "Chat-Version" "1.0"
          {	
            fileinto :create "DeltaChat";
            stop;
          }
        '';
      };
    };

    extraVirtualAliases = {
      "admin@$DOMAIN" = "$LUSER@$DOMAIN";
    };

    certificateScheme = 1;
    certificateFile = "/var/lib/acme/$DOMAIN/fullchain.pem";
    keyFile = "/var/lib/acme/$DOMAIN/key.pem";

    # Enable IMAP and POP3
    enableImap = true;
    enableImapSsl = true;
    enablePop3 = false;
    enablePop3Ssl = false;
    dkimSelector = "selector";

    # Enable the ManageSieve protocol
    enableManageSieve = true;

    virusScanning = false;
  };
}
EOF

    cat > /etc/nixos/letsencrypt/acme.nix << EOF
{ pkgs, ... }:
{
  users.groups.acmerecievers = {
    members = [ "nginx" "dovecot2" "postfix" "virtualMail" "ocserv" ];
  };
  security.acme = {
    acceptTerms = true;
    email = "$LUSER@$DOMAIN";
    certs = {
      "$DOMAIN" = {
        domain = "*.$DOMAIN";
        extraDomainNames = [ "$DOMAIN" ];
        group = "acmerecievers";
        dnsProvider = "cloudflare";
        credentialsFile = "/var/cloudflareCredentials.ini";
      };
    };
  };
}
EOF
    cat > /etc/nixos/letsencrypt/resolve.nix << EOF
{ pkgs, ... }:
{
  systemd = {
    services = {
      "acme-$DOMAIN" = {
        serviceConfig = {
          StartLimitBurst = 5;
          StartLimitIntervalSec = 5;
          Restart = "on-failure";
        };
      };
      "nginx-config-reload" = {
        serviceConfig = {
          After = [ "acme-$DOMAIN.service" ];
        };
      };
    };
  };
}
EOF

    cat > /etc/nixos/backup/restic.nix << EOF
{ pkgs, ... }:
{
  services.restic.backups = {
    options = {
      passwordFile = "/etc/restic/resticPasswd";
      repository = "s3:s3.anazonaws.com/$S3_BUCKET";
      initialize = true;
      paths = [
        "/var/dkim"
        "/var/vmail"
      ];
      timerConfig = {
        OnCalendar = [ "daily" ];
      };
      user = "restic";
      pruneOpts = [
        "--keep-daily 5"
      ];
    };
  };
  users.users.restic = {
    isNormalUser = false;
    isSystemUser = true;
  };
  environment.etc."restic/resticPasswd".text = ''
$PASSWORD
  '';
  environment.etc."restic/s3Passwd".text = ''
AWS_ACCESS_KEY_ID=$AWS_ACCESS_KEY_ID
AWS_SECRET_ACCESS_KEY=$AWS_SECRET_ACCESS_KEY
  '';
}
EOF
  
    cat > /etc/nixos/passmgr/bitwarden.nix << EOF
{ pkgs, ... }:
{
  services.bitwarden_rs = {
    enable = true;
    dbBackend = "sqlite";
    backupDir = "/var/bitwarden/backup";
    config = {
      domain = "https://password.$DOMAIN/";
      signupsAllowed = true;
      rocketPort = 8222;
    };
  };
}
EOF

    cat > /etc/nixos/webserver/nginx.nix << EOF
{ pkgs, ... }:
{
  services.nginx = {
    enable = true;
    enableReload = true;
    recommendedGzipSettings = true;
    recommendedOptimisation = true;
    recommendedProxySettings = true;
    recommendedTlsSettings = true;
    clientMaxBodySize = "1024m";

    virtualHosts = {
      "$DOMAIN" = {
        sslCertificate = "/var/lib/acme/$DOMAIN/fullchain.pem";
        sslCertificateKey = "/var/lib/acme/$DOMAIN/key.pem";
        forceSSL = true;
      };
      "vpn.$DOMAIN" = {
        sslCertificate = "/var/lib/acme/$DOMAIN/fullchain.pem";
        sslCertificateKey = "/var/lib/acme/$DOMAIN/key.pem";
        forceSSL = true;
      };
      "git.$DOMAIN" = {
        sslCertificate = "/var/lib/acme/$DOMAIN/fullchain.pem";
        sslCertificateKey = "/var/lib/acme/$DOMAIN/key.pem";
        forceSSL = true;
        locations = {
          "/" = {
            proxyPass = "http://127.0.0.1:3000";
          };
        };
      };
      "cloud.$DOMAIN" = {
        sslCertificate = "/var/lib/acme/$DOMAIN/fullchain.pem";
        sslCertificateKey = "/var/lib/acme/$DOMAIN/key.pem";
        forceSSL = true;
        locations = {
          "/" = {
            proxyPass = "http://127.0.0.1:80/";
          };
        };
      };
      "meet.$DOMAIN" = {
        forceSSL = true;
        sslCertificate = "/var/lib/acme/$DOMAIN/fullchain.pem";
        sslCertificateKey = "/var/lib/acme/$DOMAIN/key.pem";
        root = pkgs.jitsi-meet;
        extraConfig = ''
          ssi on;
        '';
        locations = {
          "@root_path" = {
            extraConfig = ''
              rewrite ^/(.*)$ / break;
            '';
          };
          "~ ^/([^/\\\\?&:'\\"]+)$" = {
            tryFiles = "\$uri @root_path";
          };
          "=/http-bind" = {
            proxyPass = "http://localhost:5280/http-bind";
            extraConfig = ''
              proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
              proxy_set_header Host \$host;
            '';
          };
          "=/external_api.js" = {
            alias = "\${pkgs.jitsi-meet}/libs/external_api.min.js";
          };
          "=/config.js" = {
            alias = "\${pkgs.jitsi-meet}/config.js";
          };
          "=/interface_config.js" = {
            alias = "\${pkgs.jitsi-meet}/interface_config.js";
          };
        };
      };
      "password.$DOMAIN" = {
        sslCertificate = "/var/lib/acme/$DOMAIN/fullchain.pem";
        sslCertificateKey = "/var/lib/acme/$DOMAIN/key.pem";
        forceSSL = true;
        locations = {
          "/" = {
            proxyPass = "http://127.0.0.1:8222";
          };
        };
      };
      "api.$DOMAIN" = {
        sslCertificate = "/var/lib/acme/$DOMAIN/fullchain.pem";
        sslCertificateKey = "/var/lib/acme/$DOMAIN/key.pem";
        forceSSL = true;
        locations = {
          "/" = {
            proxyPass = "http://127.0.0.1:5050";
          };
        };
      };
      "social.$DOMAIN" = {
        sslCertificate = "/var/lib/acme/$DOMAIN/fullchain.pem";
        sslCertificateKey = "/var/lib/acme/$DOMAIN/key.pem";
        root = "/var/www/social.$DOMAIN";
        forceSSL = true;
        locations = {
          "/" = {
            proxyPass = "http://127.0.0.1:4000";
          };
        };
        extraConfig = ''
          client_max_body_size 1024m;
        '';
      };
    };
  };
}
EOF

    cat > /etc/nixos/webserver/memcached.nix << EOF
{ pkgs, ... }:
{
  services = {
    memcached = {
      enable = true;
      user = "memcached";
      listen = "127.0.0.1";
      port = 11211;
      maxMemory = 64;
      maxConnections = 1024;
    };
  };
}
EOF

    cat > /etc/nixos/nextcloud/nextcloud.nix << EOF
{ pkgs, ... }:
{
  services.nextcloud = {
    enable = true;
    package = pkgs.nextcloud22;
    hostName = "cloud.$DOMAIN";

    # Use HTTPS for links
    https = true;
    
    # Auto-update Nextcloud Apps
    autoUpdateApps.enable = true;
    # Set what time makes sense for you
    autoUpdateApps.startAt = "05:00:00";

    config = {
      # Further forces Nextcloud to use HTTPS
      overwriteProtocol = "http";

      # Nextcloud PostegreSQL database configuration, recommended over using SQLite
      dbtype = "sqlite";
      dbuser = "nextcloud";
      dbhost = "/run/postgresql"; # nextcloud will add /.s.PGSQL.5432 by itself
      dbname = "nextcloud";
      dbpassFile = "/var/nextcloud-db-pass";

      adminpassFile = "/var/nextcloud-admin-pass";
      adminuser = "admin";
    };
  };
}
EOF

    cat > /etc/nixos/git/gitea.nix << EOF
{ pkgs, ... }:
{
  services = {
    gitea = {
      enable = true;
      stateDir = "/var/lib/gitea";
      log = {
        rootPath = "/var/lib/gitea/log";
        level = "Warn";
      };
      user = "gitea";
      database = {
        type = "sqlite3";
        host = "127.0.0.1";
        name = "gitea";
        user = "gitea";
        path = "/var/lib/gitea/data/gitea.db";
        createDatabase = true;
      };
      ssh = {
        enable = true;
        clonePort = 22;
      };
      lfs = {
        enable = true;
        contentDir = "/var/lib/gitea/lfs";
      };
      appName = "SelfPrivacy git Service";
      repositoryRoot = "/var/lib/gitea/repositories";
      domain = "git.$DOMAIN";
      rootUrl = "https://$DOMAIN/";
      httpAddress = "0.0.0.0";
      httpPort = 3000;
      cookieSecure = true;
      settings = {
        mailer = {
          ENABLED = false;
        };
        ui = {
          DEFAULT_THEME = "arc-green";
        };
        picture = {
          DISABLE_GRAVATAR = true;
        };
        admin = {
          ENABLE_KANBAN_BOARD = true;
        };
        repository = {
          FORCE_PRIVATE = false;
        };
      };
    };
  };
}
EOF

    cat > /etc/nixos/resources/limits.nix << EOF
{ pkgs, ... }:
{
  systemd.services = {
    dovecot2 = {
      serviceConfig = {
        cpuAccounting = true;
        cpuQuota = "20%";
        memoryAccounting = true;
        memoryMax = "256M";
        startLimitIntervalSec = 500;
        startLimitBurst = 5;
        blockIOWeigth = 25;
      };
    };
    postfix = {
      serviceConfig = {
        cpuAccounting = true;
        cpuQuota = "20%";
        memoryAccounting = true;
        memoryMax = "256M";
        startLimitIntervalSec = 500;
        startLimitBurst = 5;
        blockIOWeigth = 25;
      };
    };
    ocserv = {
      serviceConfig = {
        cpuAccounting = true;
        cpuQuota = "70%";
        memoryAccounting = true;
        memoryMax = "512M";
        startLimitIntervalSec = 500;
        startLimitBurst = 5;
      };
    };
    nginx = {
      serviceConfig = {
        cpuAccounting = true;
        cpuQuota = "70%";
        memoryAccounting = true;
        memoryMax = "768M";
        startLimitIntervalSec = 500;
        startLimitBurst = 5;
        blockIOWeigth = 10;
      };	
    };
  };
}
EOF

    cat > /etc/nixos/videomeet/jitsi.nix << EOF
{ pkgs, ... }:
{
  services.jitsi-meet = {
    enable = false;
    hostName = "meet.$DOMAIN";
    nginx.enable = false;
    interfaceConfig = {
      SHOW_JITSI_WATERMARK = false;
      SHOW_WATERMARK_FOR_GUESTS = false;
    };
  };
}
EOF

cat > /etc/nixos/api/api.nix << EOF
{ pkgs, ... }:
{
  services.selfprivacy-api = {
    enable = true;
  };

  users.users."selfprivacy-api" = {
    isNormalUser = false;
    isSystemUser = true;
    extraGroups = [ "opendkim" ];
  };
  users.groups."selfprivacy-api" = {
    members = [ "selfprivacy-api" ];
  };
}
EOF

cat > /etc/nixos/api/api-package.nix << EOF
{ nixpkgs ? import <nixpkgs> {}, pythonPkgs ? nixpkgs.pkgs.python37Packages }:

let
  inherit (nixpkgs) pkgs;
  inherit pythonPkgs;

  selfprivacy-api = { buildPythonPackage, flask, flask-restful, pandas }:
    buildPythonPackage rec {
      pname = "selfprivacy-api";
      version = "1.0";
      src = builtins.fetchGit {
        url = "https://git.selfprivacy.org/ilchub/selfprivacy-rest-api.git";
        rev = "568add06c6d622d417582ce55e3cc960686721ed";
      };
      propagatedBuildInputs = [ flask flask-restful pandas ];
      meta = {
        description = ''
          SelfPrivacy Server Management API
        '';
      };
    };
  drv = pythonPkgs.callPackage selfprivacy-api {};
in
  if pkgs.lib.inNixShell then drv.env else drv
EOF

cat > /etc/nixos/api/api-module.nix << EOF
{ config, lib, pkgs, ... }:

with lib;

let
  selfprivacy-api = pkgs.callPackage ./api-package.nix {};
  cfg = config.services.selfprivacy-api;
  directionArg = if cfg.direction == ""
    then ""
    else "--direction=\${cfg.direction}";
in 
{
  options.services.selfprivacy-api = {
    enable = mkOption {
      default = false;
      type = types.bool;
      description = ''
        Enable SelfPrivacy API service
      '';
    };
  };
  config = lib.mkIf cfg.enable {

    systemd.services.selfprivacy-api = {
      description = "API Server used to control system from the mobile application";
      environment = config.nix.envVars // {
        inherit (config.environment.sessionVariables) NIX_PATH;
        HOME = "/root";
        PYTHONUNBUFFERED = "1";
      } // config.networking.proxy.envVars;
      path = [ "/var/" "/var/dkim/" pkgs.coreutils pkgs.gnutar pkgs.xz.bin pkgs.gzip pkgs.gitMinimal config.nix.package.out pkgs.nixos-rebuild ];
      after = [ "network-online.target" ];
      wantedBy = [ "network-online.target" ];
      serviceConfig = {
        User = "root";
        ExecStart = "\${selfprivacy-api}/bin/main.py";
        Restart = "always";
        RestartSec = "5";
      };
    };
  };
}
EOF

cat > /etc/nixos/vpn/ocserv.nix << EOF
{ pkgs, ...}:
{
  users.groups.ocserv = {
    members = [ "ocserv" ];
  };
  users.users.ocserv = {
    isNormalUser = false;
    isSystemUser = true;
    extraGroups = [ "ocserv" "acmerecievers" ];
  };
  services.ocserv = {
    enable = true;
    config = ''
socket-file = /var/run/ocserv-socket

auth = "pam"

tcp-port = 8443
udp-port = 8443

server-cert = /var/lib/acme/$DOMAIN/fullchain.pem
server-key = /var/lib/acme/$DOMAIN/key.pem

compression = true

max-clients = 0
max-same-clients = 6

try-mtu-discovery = true

idle-timeout=1200
mobile-idle-timeout=2400

default-domain = vpn.$DOMAIN

device = vpn0

ipv4-network = 10.10.10.0
ipv4-netmask = 255.255.255.0

tunnel-all-dns = true
dns = 1.1.1.1
dns = 1.0.0.1

route = default

cisco-client-compat = true

    '';
  };
}
EOF

cat > /etc/nixos/social/pleroma-package.nix << EOF
{ lib
, stdenv
, autoPatchelfHook
, fetchurl
, file
, makeWrapper
, ncurses
, nixosTests
, openssl
, unzip
, zlib
}:
stdenv.mkDerivation {
  pname = "pleroma-otp";
  version = "2.3.0";

  # To find the latest binary release stable link, have a look at
  # the CI pipeline for the latest commit of the stable branch
  # https://git.pleroma.social/pleroma/pleroma/-/tree/stable
  src = {
    aarch64-linux = fetchurl {
      url = "https://git.pleroma.social/pleroma/pleroma/-/jobs/182392/artifacts/download";
      sha256 = "1drpd6xh7m2damxi5impb8jwvjl6m3qv5yxynl12i8g66vi3rbwf";
    };
    x86_64-linux = fetchurl {
      url = "https://git.pleroma.social/pleroma/pleroma/-/jobs/182388/artifacts/download";
      sha256 = "1c6l04gga9iigm249ywwcrjg6wzy8iiid652mws3j9dnl71w2sim";
    };
  }."\${stdenv.hostPlatform.system}";

  nativeBuildInputs = [ unzip ];

  buildInputs = [
    autoPatchelfHook
    file
    makeWrapper
    ncurses
    openssl
    zlib
  ];

  # mkDerivation fails to detect the zip nature of $src due to the
  # missing .zip extension.
  # Let's unpack the archive explicitely.
  unpackCmd = "unzip \$curSrc";

  installPhase = ''
    mkdir \$out
    cp -r * \$out'';

  # Pleroma is using the project's root path (here the store path)
  # as its TMPDIR.
  # Patching it to move the tmp dir to the actual tmpdir
  postFixup = ''
    wrapProgram \$out/bin/pleroma \
      --set-default RELEASE_TMP "/tmp"
    wrapProgram \$out/bin/pleroma_ctl \
      --set-default RELEASE_TMP "/tmp"'';

  passthru.tests = {
    pleroma = nixosTests.pleroma;
  };

  meta = with lib; {
    description = "ActivityPub microblogging server";
    homepage = https://git.pleroma.social/pleroma/pleroma;
    license = licenses.agpl3;
    maintainers = with maintainers; [ ninjatrappeur ];
    platforms = [ "x86_64-linux" "aarch64-linux" ];
  };
}
EOF

cat > /etc/nixos/social/pleroma-module.nix << EOF
{ config, options, lib, pkgs, stdenv, ... }:
let
  cfg = config.services.pleroma;
in {
  options = {
    services.pleroma = with lib; {
      enable = mkEnableOption "pleroma";

      package = mkOption {
        type = types.package;
        default = pkgs.pleroma-otp;
        description = "Pleroma package to use.";
      };

      user = mkOption {
        type = types.str;
        default = "pleroma";
        description = "User account under which pleroma runs.";
      };

      group = mkOption {
        type = types.str;
        default = "pleroma";
        description = "Group account under which pleroma runs.";
      };

      stateDir = mkOption {
        type = types.str;
        default = "/var/lib/pleroma";
        readOnly = true;
        description = "Directory where the pleroma service will save the uploads and static files.";
      };

      configs = mkOption {
        type = with types; listOf str;
        description = ''
          Pleroma public configuration.
          This list gets appended from left to
          right into /etc/pleroma/config.exs. Elixir evaluates its
          configuration imperatively, meaning you can override a
          setting by appending a new str to this NixOS option list.
          <emphasis>DO NOT STORE ANY PLEROMA SECRET
          HERE</emphasis>, use
          <link linkend="opt-services.pleroma.secretConfigFile">services.pleroma.secretConfigFile</link>
          instead.
          This setting is going to be stored in a file part of
          the Nix store. The Nix store being world-readable, it's not
          the right place to store any secret
          Have a look to Pleroma section in the NixOS manual for more
          informations.
          '';
      };

      secretConfigFile = mkOption {
        type = types.str;
        default = "/var/lib/pleroma/secrets.exs";
        description = ''
          Path to the file containing your secret pleroma configuration.
          <emphasis>DO NOT POINT THIS OPTION TO THE NIX
          STORE</emphasis>, the store being world-readable, it'll
          compromise all your secrets.
        '';
      };
    };
  };

  config = lib.mkIf cfg.enable {
    users = {
      users."\${cfg.user}" = {
        description = "Pleroma user";
        home = cfg.stateDir;
        extraGroups = [ cfg.group ];
      };
      groups."\${cfg.group}" = {};
    };

    environment.systemPackages = [ cfg.package ];

    environment.etc."/pleroma/config.exs".text = ''
      \${lib.concatMapStrings (x: "\${x}") cfg.configs}
      # The lau/tzdata library is trying to download the latest
      # timezone database in the OTP priv directory by default.
      # This directory being in the store, it's read-only.
      # Setting that up to a more appropriate location.
      config :tzdata, :data_dir, "/var/lib/pleroma/elixir_tzdata_data"
      import_config "\${cfg.secretConfigFile}"
    '';

    systemd.services.pleroma = {
      description = "Pleroma social network";
      after = [ "network-online.target" "postgresql.service" ];
      wantedBy = [ "multi-user.target" ];
      restartTriggers = [ config.environment.etc."/pleroma/config.exs".source ];
      serviceConfig = {
        User = cfg.user;
        Group = cfg.group;
        Type = "exec";
        WorkingDirectory = "~";
        StateDirectory = "pleroma pleroma/static pleroma/uploads";
        StateDirectoryMode = "700";

        # Checking the conf file is there then running the database
        # migration before each service start, just in case there are
        # some pending ones.
        #
        # It's sub-optimal as we'll always run this, even if pleroma
        # has not been updated. But the no-op process is pretty fast.
        # Better be safe than sorry migration-wise.
        ExecStartPre =
          let preScript = pkgs.writers.writeBashBin "pleromaStartPre"
            "\${cfg.package}/bin/pleroma_ctl migrate";
          in "\${preScript}/bin/pleromaStartPre";

        ExecStart = "\${cfg.package}/bin/pleroma start";
        ExecStop = "\${cfg.package}/bin/pleroma stop";
        ExecReload = "\${pkgs.coreutils}/bin/kill -HUP \$MAINPID";

        # Systemd sandboxing directives.
        # Taken from the upstream contrib systemd service at
        # pleroma/installation/pleroma.service
        PrivateTmp = true;
        ProtectHome = true;
        ProtectSystem = "full";
        PrivateDevices = false;
        NoNewPrivileges = true;
        CapabilityBoundingSet = "~CAP_SYS_ADMIN";
      };
    };

  };
  meta.maintainers = with lib.maintainers; [ ninjatrappeur ];
}
EOF

cat > /etc/nixos/social/pleroma.nix << EOF
{ pkgs, ... }:
{
  nixpkgs.overlays = [(self: super: {
    pleroma-otp = self.callPackage ./pleroma-package.nix {};
  })];
  services = {
    pleroma = {
      enable = true;
      user = "pleroma";
      group = "pleroma";
      configs = [
      (builtins.readFile ./config.exs)
      ];
    };
    postgresql = {
      enable = true;
      package = pkgs.postgresql_12;
      initialScript = "/etc/setup.psql";
    };
  };
  environment.etc."setup.psql".text = ''
CREATE USER pleroma WITH ENCRYPTED PASSWORD '$DB_PASSWORD';
CREATE DATABASE pleroma OWNER pleroma;
\\c pleroma;
--Extensions made by ecto.migrate that need superuser access
CREATE EXTENSION IF NOT EXISTS citext;
CREATE EXTENSION IF NOT EXISTS pg_trgm;
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
  '';
  users.users.pleroma = {
    extraGroups = [ "postgres" ];
  };
}
EOF

cat > /etc/nixos/social/config.exs << EOF
import Config

config :pleroma, Pleroma.Web.Endpoint,
   url: [host: "social.$DOMAIN", scheme: "https", port: 443],
   http: [ip: {127, 0, 0, 1}, port: 4000]
   #secret_key_base: "",
   #signing_salt: ""

config :pleroma, :instance,
  name: "social.$DOMAIN",
  email: "$LUSER@$DOMAIN",
  notify_email: "$LUSER@$DOMAIN",
  limit: 5000,
  upload_limit: 1073741824,
  registrations_open: true

config :pleroma, :media_proxy,
  enabled: false,
  redirect_on_failure: true
  #base_url: "https://cache.pleroma.social"

config :pleroma, Pleroma.Repo,
  adapter: Ecto.Adapters.Postgres,
  username: "pleroma",
  password: "$DB_PASSWORD",
  database: "pleroma",
  hostname: "localhost",
  pool_size: 10

#config :web_push_encryption, :vapid_details,
  #subject: "",
  #public_key: "",
  #private_key: ""

config :pleroma, :database, rum_enabled: false
config :pleroma, :instance, static_dir: "/var/lib/pleroma/static"
config :pleroma, Pleroma.Uploaders.Local, uploads: "/var/lib/pleroma/uploads"

config :pleroma, :http_security,
  sts: true

#config :joken, default_signer: ""

config :pleroma, configurable_from_database: false

EOF

cat > /etc/nixos/mailserver/system/alps.nix << EOF
{ pkgs, lib, fetchgit, buildGoModule, ... }: {
  nixpkgs.overlays =
    [ (self: super: { alps = self.callPackage ./alps-package.nix { }; }) ];

  systemd.services = {
    alps = {
      path = [ pkgs.alps pkgs.coreutils ];
      serviceConfig = {
        ExecStart =
          "\${pkgs.alps}/bin/alps -theme sourcehut imaps://$DOMAIN:993 smtps://$DOMAIN:465";
        WorkingDirectory = "\${pkgs.alps}/bin";
      };
    };
  };
}
EOF

cat > /etc/nixos/mailserver/system/alps-package.nix << EOF
{ lib, fetchgit, buildGoModule, ... }:
buildGoModule rec {
  pname = "alps";
  version = "v1.0.0"; # latest available tag at the moment

  src = fetchGit {
    url = "https://git.selfprivacy.org/ilchub/selfprivacy-alps";
    rev = "dc2109ca2fdabfbda5d924faa4947f5694d5d758";
  };

  vendorSha256 = "0bqg0qjam4mvh07wfil6l5spz32mk5a7kfxxnwfyva805pzmn6dk";

  deleteVendor = false;
  runVend = true;

  buildPhase = ''
    go build ./cmd/alps
  '';

  installPhase = ''
    mkdir -p \$out/bin
    cp -r * \$out/bin
  '';

  meta = with lib; {
    description = "Webmail application for the dovecot/postfix mailserver";
    homepage = "https://git.selfprivacy.org/ilchub/selfprivacy-alps";
    license = licenses.mit;
  };
}
EOF

  [[ -n "$doNetConf" ]] && makeNetworkingConf || true
}

makeNetworkingConf() {
  # XXX It'd be better if we used procfs for all this...
  local IFS=$'\n'
  eth0_name=$(ip address show | grep '^2:' | awk -F': ' '{print $2}')
  eth0_ip4s=$(ip address show dev "$eth0_name" | grep 'inet ' | sed -r 's|.*inet ([0-9.]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|')
  eth0_ip6s=$(ip address show dev "$eth0_name" | grep 'inet6 ' | sed -r 's|.*inet6 ([0-9a-f:]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|' || '')
  gateway=$(ip route show dev "$eth0_name" | grep default | sed -r 's|default via ([0-9.]+).*|\1|')
  gateway6=$(ip -6 route show dev "$eth0_name" | grep default | sed -r 's|default via ([0-9a-f:]+).*|\1|' || true)
  ether0=$(ip address show dev "$eth0_name" | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|')

  eth1_name=$(ip address show | grep '^3:' | awk -F': ' '{print $2}')||true
  if [ -n "$eth1_name" ];then
    eth1_ip4s=$(ip address show dev "$eth1_name" | grep 'inet ' | sed -r 's|.*inet ([0-9.]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|')
    eth1_ip6s=$(ip address show dev "$eth1_name" | grep 'inet6 ' | sed -r 's|.*inet6 ([0-9a-f:]+)/([0-9]+).*|{ address="\1"; prefixLength=\2; }|' || '')
    ether1=$(ip address show dev "$eth1_name" | grep link/ether | sed -r 's|.*link/ether ([0-9a-f:]+) .*|\1|')
    interfaces1=<< EOF
      $eth1_name = {
        ipv4.addresses = [$(for a in "${eth1_ip4s[@]}"; do echo -n "
          $a"; done)
        ];
        ipv6.addresses = [$(for a in "${eth1_ip6s[@]}"; do echo -n "
          $a"; done)
        ];
EOF
    extraRules1="ATTR{address}==\"${ether1}\", NAME=\"${eth1_name}\""
  else
    interfaces1=""
    extraRules1=""
  fi

  readarray nameservers < <(grep ^nameserver /etc/resolv.conf | sed -r 's/^nameserver[[:space:]]+([0-9.a-fA-F]+).*/"\1"/')

  if [[ "$eth0_name" = eth* ]]; then
    predictable_inames="usePredictableInterfaceNames = lib.mkForce false;"
  else
    predictable_inames="usePredictableInterfaceNames = lib.mkForce true;"
  fi
  cat > /etc/nixos/networking.nix << EOF
{ lib, ... }: {
  # This file was populated at runtime with the networking
  # details gathered from the active system.
  networking = {
    nameservers = [ ${nameservers[@]} ];
    defaultGateway = "${gateway}";
    defaultGateway6 = "${gateway6}";
    dhcpcd.enable = false;
    $predictable_inames
    interfaces = {
      $eth0_name = {
        ipv4.addresses = [$(for a in "${eth0_ip4s[@]}"; do echo -n "
          $a"; done)
        ];
        ipv6.addresses = [$(for a in "${eth0_ip6s[@]}"; do echo -n "
          $a"; done)
        ];
        ipv4.routes = [ { address = "${gateway}"; prefixLength = 32; } ];
        ipv6.routes = [ { address = "${gateway6}"; prefixLength = 32; } ];
      };
      $interfaces1
    };
  };
  services.udev.extraRules = ''
    ATTR{address}=="${ether0}", NAME="${eth0_name}"
    $extraRules1
  '';
}
EOF
}

makeSwap() {
  # TODO check currently available swapspace first
  swapFile=$(mktemp /tmp/nixos-infect.XXXXX.swp)
  dd if=/dev/zero "of=$swapFile" bs=1M count=$((1*1024))
  chmod 0600 "$swapFile"
  mkswap "$swapFile"
  swapon -v "$swapFile"
}

removeSwap() {
  swapoff -a
  rm -vf /tmp/nixos-infect.*.swp
}

prepareEnv() {
  # $grubdev is used in makeConf()
  for grubdev in /dev/vda /dev/sda; do [[ -e $grubdev ]] && break; done

  # Retrieve root fs block device
  #                   (get root mount)  (get partition or logical volume)
  rootfsdev=$(mount | grep "on / type" | awk '{print $1;}')

  # DigitalOcean doesn't seem to set USER while running user data
  export USER="root"
  export HOME="/root"

  # Nix installer tries to use sudo regardless of whether we're already uid 0
  #which sudo || { sudo() { eval "$@"; }; export -f sudo; }
  # shellcheck disable=SC2174
  mkdir -p -m 0755 /nix
}

fakeCurlUsingWget() {
  # Use adapted wget if curl is missing
  which wget && { \
    curl() {
      eval "wget $(
        (local isStdout=1
        for arg in "$@"; do
          case "$arg" in
            "-o")
              echo "-O";
              isStdout=0
              ;;
            "-O")
              isStdout=0
              ;;
            "-L")
              ;;
            *)
              echo "$arg"
              ;;
          esac
        done;
        [[ $isStdout -eq 1 ]] && echo "-O-"
        )| tr '\n' ' '
      )"
    }; export -f curl; }
}

req() {
  type "$1" > /dev/null 2>&1 || which "$1" > /dev/null 2>&1
}

checkEnv() {
  # Perform some easy fixups before checking
  # TODO prevent multiple calls to apt-get update
  which dnf && dnf install -y perl-Digest-SHA # Fedora 24
  which bzcat || (which yum && yum install -y bzip2) \
              || (which apt-get && apt-get update && apt-get install -y bzip2) \
              || true
  which xzcat || (which yum && yum install -y xz-utils) \
              || (which apt-get && apt-get update && apt-get install -y xz-utils) \
              || true
  which curl  || fakeCurlUsingWget \
              || (which apt-get && apt-get update && apt-get install -y curl) \
              || true

  [[ "$(whoami)" == "root" ]] || { echo "ERROR: Must run as root"; return 1; }

  req curl || req wget || { echo "ERROR: Missing both curl and wget"; return 1; }
  req bzcat            || { echo "ERROR: Missing bzcat";              return 1; }
  req xzcat            || { echo "ERROR: Missing xzcat";              return 1; }
  req groupadd         || { echo "ERROR: Missing groupadd";           return 1; }
  req useradd          || { echo "ERROR: Missing useradd";            return 1; }
  req ip               || { echo "ERROR: Missing ip";                 return 1; }
  req awk              || { echo "ERROR: Missing awk";                return 1; }
  req cut              || { echo "ERROR: Missing cut";                return 1; }
}

infect() {
  # Add nix build users
  # FIXME run only if necessary, rather than defaulting true
  groupadd nixbld -g 30000 || true
  for i in {1..10}; do
    useradd -c "Nix build user $i" -d /var/empty -g nixbld -G nixbld -M -N -r -s "$(which nologin)" "nixbld$i" || true
  done
  # TODO use addgroup and adduser as fallbacks
  #addgroup nixbld -g 30000 || true
  #for i in {1..10}; do adduser -DH -G nixbld nixbld$i || true; done

  curl -L https://nixos.org/nix/install | $SHELL

  # shellcheck disable=SC1090
  source ~/.nix-profile/etc/profile.d/nix.sh

  [[ -z "$NIX_CHANNEL" ]] && NIX_CHANNEL="nixos-19.09"
  nix-channel --remove nixpkgs
  nix-channel --add "https://nixos.org/channels/$NIX_CHANNEL" nixos
  nix-channel --update

  export NIXOS_CONFIG=/etc/nixos/configuration.nix

  nix-env --set \
    -I nixpkgs=$HOME/.nix-defexpr/channels/nixos \
    -f '<nixpkgs/nixos>' \
    -p /nix/var/nix/profiles/system \
    -A system

  # Remove nix installed with curl | bash
  rm -fv /nix/var/nix/profiles/default*
  /nix/var/nix/profiles/system/sw/bin/nix-collect-garbage

  # Reify resolv.conf
  [[ -L /etc/resolv.conf ]] && mv -v /etc/resolv.conf /etc/resolv.conf.lnk && cat /etc/resolv.conf.lnk > /etc/resolv.conf

  # Stage the Nix coup d'état
  touch /etc/NIXOS
  echo etc/nixos                   > /etc/NIXOS_LUSTRATE
  echo etc/resolv.conf            >> /etc/NIXOS_LUSTRATE
  echo root/.nix-defexpr/channels >> /etc/NIXOS_LUSTRATE

  rm -rf /boot.bak
  mv -v /boot /boot.bak
  /nix/var/nix/profiles/system/bin/switch-to-configuration boot
}

[ "$PROVIDER" = "digitalocean" ] && doNetConf=y # digitalocean requires detailed network config to be generated

apt update
apt install -y git whois
cat > /etc/resolv.conf << EOF
nameserver 1.1.1.1
nameserver 1.0.0.1
EOF
prepareEnv
makeSwap # smallest (512MB) droplet needs extra memory!
checkEnv
makeConf
infect
removeSwap

if [[ -z "$NO_REBOOT" ]]; then
  reboot
fi