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{
  config,
  inputs,
  lib,
  libNginx,
  this,
  ...
}:
with lib;
let
  cfg = config.nixfiles.modules.ipfs;

  gatewayDefaultPort = 6001;
  apiDefaultPort = 5001;
  swarmDefaultPort = 4001;
in
{
  options.nixfiles.modules.ipfs = {
    enable = mkEnableOption "IPFS daemon";

    domain = mkOption {
      description = "Domain name sans protocol scheme.";
      type = with types; str;
      default = "ipfs.${config.networking.fqdn}";
    };

    gatewayBind = mkOption {
      description = "Gateway bind.";
      type = with types; str;
      default = "127.0.0.1";
    };
    gatewayPort = mkOption {
      description = "Gateway port.";
      type = with types; port;
      default = if this.isHeadless then gatewayDefaultPort + 990 else gatewayDefaultPort;
    };

    apiBind = mkOption {
      description = "API bind.";
      type = with types; str;
      default = "127.0.0.1";
    };
    apiPort = mkOption {
      description = "API port.";
      type = with types; port;
      default = if this.isHeadless then apiDefaultPort + 990 else apiDefaultPort;
    };

    swarmPort = mkOption {
      description = "Swarm port.";
      type = with types; port;
      default = swarmDefaultPort;
    };
  };

  config = mkIf cfg.enable (mkMerge [
    {
      services.kubo = {
        enable = true;

        user = my.username;
        inherit (config.my) group;

        dataDir = "${config.dirs.data}/ipfs";

        autoMigrate = true;
        autoMount = true;
        emptyRepo = true;
        enableGC = true;

        # https://github.com/ipfs/kubo/blob/master/docs/config.md
        settings = mkMerge [
          (
            let
              filterAddresses =
                [
                  "/ip4/100.64.0.0/ipcidr/10"
                  "/ip4/169.254.0.0/ipcidr/16"
                  "/ip4/172.16.0.0/ipcidr/12"
                  "/ip4/192.0.0.0/ipcidr/24"
                  "/ip4/192.0.2.0/ipcidr/24"
                  "/ip4/192.168.0.0/ipcidr/16"
                  "/ip4/198.18.0.0/ipcidr/15"
                  "/ip4/198.51.100.0/ipcidr/24"
                  "/ip4/203.0.113.0/ipcidr/24"
                  "/ip4/240.0.0.0/ipcidr/4"
                  "/ip6/100::/ipcidr/64"
                  "/ip6/2001:2::/ipcidr/48"
                  "/ip6/2001:db8::/ipcidr/32"
                  "/ip6/fe80::/ipcidr/10"
                ]
                ++ optionals (!hasAttr "wireguard" this) [
                  "/ip4/10.0.0.0/ipcidr/8"
                  "/ip6/fc00::/ipcidr/7"
                ];
            in
            {
              Addresses = {
                API = "/ip4/${cfg.apiBind}/tcp/${toString cfg.apiPort}";
                Gateway = "/ip4/${cfg.gatewayBind}/tcp/${toString cfg.gatewayPort}";
                Swarm =
                  let
                    port = toString cfg.swarmPort;
                  in
                  [
                    "/ip4/0.0.0.0/tcp/${port}"
                    "/ip6/::/tcp/${port}"
                    "/ip4/0.0.0.0/udp/${port}/quic"
                    "/ip4/0.0.0.0/udp/${port}/quic-v1"
                    "/ip4/0.0.0.0/udp/${port}/quic-v1/webtransport"
                    "/ip6/::/udp/${port}/quic"
                    "/ip6/::/udp/${port}/quic-v1"
                    "/ip6/::/udp/${port}/quic-v1/webtransport"
                  ];

                NoAnnounce = filterAddresses;
              };

              Swarm.AddrFilters = filterAddresses;

              API.HTTPHeaders = {
                Access-Control-Allow-Origin = [
                  "http://127.0.0.1:5001"
                  "http://webui.ipfs.io.ipns.localhost:6001"
                ];
                Access-Control-Allow-Methods = [
                  "PUT"
                  "POST"
                ];
              };

              Experimental.FilestoreEnabled = true;
            }
          )
        ];

        localDiscovery = true;

        startWhenNeeded = true;
      };

      networking.firewall = rec {
        allowedTCPPorts = [ swarmDefaultPort ];
        allowedUDPPorts = allowedTCPPorts;
      };

      boot.kernel.sysctl = {
        "net.core.rmem_max" = 7500000;
        "net.core.wmem_max" = 7500000;
      };

      topology = with cfg; {
        nodes.${this.hostname}.services.ipfs-kubo = {
          name = "IPFS Kubo";
          icon = "${inputs.homelab-svg-assets}/assets/ipfs.svg";
          details.listen.text = ''
            ${gatewayBind}:${toString gatewayPort}
            ${apiBind}:${toString apiPort}
          '';
        };
      };
    }
    (mkIf this.isHeadless {
      nixfiles.modules.nginx = {
        enable = true;
        upstreams = with cfg; {
          kubo_gateway.servers."${gatewayBind}:${toString gatewayPort}" = { };
          kubo_api.servers."${apiBind}:${toString apiPort}" = { };
        };
        virtualHosts = {
          ${cfg.domain} = {
            locations."/".proxyPass = "http://kubo_gateway";
            extraConfig = libNginx.config.internalOnly;
          };
          "api.${cfg.domain}" = {
            locations = {
              "/".proxyPass = "http://kubo_api";
              "~ ^/$".return =
                "301 http${optionalString config.nixfiles.modules.acme.enable "s"}://api.${cfg.domain}/webui";
            };
            extraConfig = libNginx.config.internalOnly;
          };
        };
      };

      topology.nodes.${this.hostname}.services.ipfs-kubo.info = cfg.domain;
    })
  ]);
}

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