Change:
<ins> { config, lib, pkgs, ... }: let cfg = config.services.cryptpad; inherit (lib) mkIf mkMerge mkOption strings types ; # The Cryptpad configuration file isn't JSON, but a JavaScript source file that assigns a JSON value # to a variable. cryptpadConfigFile = builtins.toFile "cryptpad_config.js" '' module.exports = ${builtins.toJSON cfg.settings} ''; # Derive domain names for Nginx configuration from Cryptpad configuration mainDomain = strings.removePrefix "https://" cfg.settings.httpUnsafeOrigin; sandboxDomain = if cfg.settings.httpSafeOrigin == null then mainDomain else strings.removePrefix "https://" cfg.settings.httpSafeOrigin; in { options.services.cryptpad = { enable = lib.mkEnableOption "cryptpad"; package = lib.mkPackageOption pkgs "cryptpad" { }; configureNginx = mkOption { description = '' Configure Nginx as a reverse proxy for Cryptpad. Note that this makes some assumptions on your setup, and sets settings that will affect other virtualHosts running on your Nginx instance, if any. Alternatively you can configure a reverse-proxy of your choice. ''; type = types.bool; default = false; }; settings = mkOption { description = '' Cryptpad configuration settings. See https://github.com/cryptpad/cryptpad/blob/main/config/config.example.js for a more extensive reference documentation. Test your deployed instance through `https://<domain>/checkup/`. ''; type = types.submodule { freeformType = (pkgs.formats.json { }).type; options = { httpUnsafeOrigin = mkOption { type = types.str; example = "https://cryptpad.example.com"; default = ""; description = "This is the URL that users will enter to load your instance"; }; httpSafeOrigin = mkOption { type = types.nullOr types.str; example = "https://cryptpad-ui.example.com. Apparently optional but recommended."; description = "Cryptpad sandbox URL"; }; httpAddress = mkOption { type = types.str; default = "127.0.0.1"; description = "Address on which the Node.js server should listen"; }; httpPort = mkOption { type = types.int; default = 3000; description = "Port on which the Node.js server should listen"; }; websocketPort = mkOption { type = types.int; default = 3003; description = "Port for the websocket that needs to be separate"; }; maxWorkers = mkOption { type = types.nullOr types.int; default = null; description = "Number of child processes, defaults to number of cores available"; }; adminKeys = mkOption { type = types.listOf types.str; default = [ ]; description = "List of public signing keys of users that can access the admin panel"; example = [ "[cryptpad-user1@my.awesome.website/YZgXQxKR0Rcb6r6CmxHPdAGLVludrAF2lEnkbx1vVOo=]" ]; }; logToStdout = mkOption { type = types.bool; default = true; description = "Controls whether log output should go to stdout of the systemd service"; }; logLevel = mkOption { type = types.str; default = "info"; description = "Controls log level"; }; blockDailyCheck = mkOption { type = types.bool; default = true; description = '' Disable telemetry. This setting is only effective if the 'Disable server telemetry' setting in the admin menu has been untouched, and will be ignored by cryptpad once that option is set either way. Note that due to the service confinement, just enabling the option in the admin menu will not be able to resolve DNS and fail; this setting must be set as well. ''; }; installMethod = mkOption { type = types.str; default = "nixos"; description = '' Install method is listed in telemetry if you agree to it through the consentToContact setting in the admin panel. ''; }; }; }; }; }; config = mkIf cfg.enable (mkMerge [ { systemd.services.cryptpad = { description = "Cryptpad service"; wantedBy = [ "multi-user.target" ]; after = [ "networking.target" ]; serviceConfig = { BindReadOnlyPaths = [ cryptpadConfigFile # apparently needs proc for workers management "/proc" "/dev/urandom" ]; DynamicUser = true; Environment = [ "CRYPTPAD_CONFIG=${cryptpadConfigFile}" "HOME=%S/cryptpad" ]; ExecStart = lib.getExe cfg.package; Restart = "always"; StateDirectory = "cryptpad"; WorkingDirectory = "%S/cryptpad"; # security way too many numerous options, from the systemd-analyze security output # at end of test: block everything except # - SystemCallFiters=@resources is required for node # - MemoryDenyWriteExecute for node JIT # - RestrictAddressFamilies=~AF_(INET|INET6) / PrivateNetwork to bind to sockets # - IPAddressDeny likewise allow localhost if binding to localhost or any otherwise # - PrivateUsers somehow service doesn't start with that # - DeviceAllow (char-rtc r added by ProtectClock) AmbientCapabilities = ""; CapabilityBoundingSet = ""; DeviceAllow = ""; LockPersonality = true; NoNewPrivileges = true; PrivateDevices = true; PrivateTmp = true; ProcSubset = "pid"; ProtectClock = true; ProtectControlGroups = true; ProtectHome = true; ProtectHostname = true; ProtectKernelLogs = true; ProtectKernelModules = true; ProtectKernelTunables = true; ProtectProc = "invisible"; ProtectSystem = "strict"; RemoveIPC = true; RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ]; RestrictNamespaces = true; RestrictRealtime = true; RestrictSUIDSGID = true; RuntimeDirectoryMode = "700"; SocketBindAllow = [ "tcp:${builtins.toString cfg.settings.httpPort}" "tcp:${builtins.toString cfg.settings.websocketPort}" ]; SocketBindDeny = [ "any" ]; StateDirectoryMode = "0700"; SystemCallArchitectures = "native"; SystemCallFilter = [ "@pkey" "@system-service" "~@chown" "~@keyring" "~@memlock" "~@privileged" "~@resources" "~@setuid" "~@timer" ]; UMask = "0077"; }; confinement = { enable = true; binSh = null; mode = "chroot-only"; }; }; } # block external network access if not phoning home and # binding to localhost (default) (mkIf ( cfg.settings.blockDailyCheck && (builtins.elem cfg.settings.httpAddress [ "127.0.0.1" "::1" ]) ) { systemd.services.cryptpad = { serviceConfig = { IPAddressAllow = [ "localhost" ]; IPAddressDeny = [ "any" ]; }; }; } ) # .. conversely allow DNS & TLS if telemetry is explicitly enabled (mkIf (!cfg.settings.blockDailyCheck) { systemd.services.cryptpad = { serviceConfig = { BindReadOnlyPaths = [ "-/etc/resolv.conf" "-/run/systemd" "/etc/hosts" "/etc/ssl/certs/ca-certificates.crt" ]; }; }; }) (mkIf cfg.configureNginx { assertions = [ { assertion = cfg.settings.httpUnsafeOrigin != ""; message = "services.cryptpad.settings.httpUnsafeOrigin is required"; } { assertion = strings.hasPrefix "https://" cfg.settings.httpUnsafeOrigin; message = "services.cryptpad.settings.httpUnsafeOrigin must start with https://"; } { assertion = cfg.settings.httpSafeOrigin == null || strings.hasPrefix "https://" cfg.settings.httpSafeOrigin; message = "services.cryptpad.settings.httpSafeOrigin must start with https:// (or be unset)"; } ]; services.nginx = { enable = true; recommendedTlsSettings = true; recommendedProxySettings = true; recommendedOptimisation = true; recommendedGzipSettings = true; virtualHosts = mkMerge [ { "${mainDomain}" = { serverAliases = lib.optionals (cfg.settings.httpSafeOrigin != null) [ sandboxDomain ]; enableACME = lib.mkDefault true; forceSSL = true; locations."/" = { proxyPass = "http://${cfg.settings.httpAddress}:${builtins.toString cfg.settings.httpPort}"; extraConfig = '' client_max_body_size 150m; ''; }; locations."/cryptpad_websocket" = { proxyPass = "http://${cfg.settings.httpAddress}:${builtins.toString cfg.settings.websocketPort}"; proxyWebsockets = true; }; }; } ]; }; }) ]); } </ins>

Discussion:
Project description CryptPad is a collaborative office suite that is end-to-end encrypted and open-source. Enable this a service for NixOS. Metadata homepage URL: source URL: license: agpl2 platforms: unix, linux, darwin, ...
CryptPad used to be included in nixpkgs, but it was removed because there weren't enough maintainers. The removal occurred with the commits and .
Not quite true: it was removed because they had a strong dependency on out-of-date software. . Now, there is an ongoing effort to re-introduce it in : .