From de21486c39afb61b355baa3f2e4787ee7fe11c09 Mon Sep 17 00:00:00 2001
From: Lillian-Violet <git@lillianviolet.dev>
Date: Sun, 21 Jan 2024 22:58:18 +0100
Subject: [PATCH] Add conduit

---
 nixos/hosts/queen/configuration.nix           |   2 +
 .../package-configs/conduit/configuration.nix | 143 ++++++++++++++++++
 2 files changed, 145 insertions(+)
 create mode 100644 nixos/server/package-configs/conduit/configuration.nix

diff --git a/nixos/hosts/queen/configuration.nix b/nixos/hosts/queen/configuration.nix
index d178c9b..c328563 100644
--- a/nixos/hosts/queen/configuration.nix
+++ b/nixos/hosts/queen/configuration.nix
@@ -32,6 +32,7 @@
     ../../server/package-configs/jellyfin/configuration.nix
     ../../server/package-configs/ombi/configuration.nix
     ../../server/package-configs/aria2/configuration.nix
+    ../../server/package-configs/conduit/configuration.nix
   ];
 
   boot.tmp.cleanOnBoot = true;
@@ -89,6 +90,7 @@
     akkoma
     age
     fzf
+    matrix-conduit
     docker
     docker-compose
     git
diff --git a/nixos/server/package-configs/conduit/configuration.nix b/nixos/server/package-configs/conduit/configuration.nix
new file mode 100644
index 0000000..60b25fc
--- /dev/null
+++ b/nixos/server/package-configs/conduit/configuration.nix
@@ -0,0 +1,143 @@
+{
+  inputs,
+  outputs,
+  lib,
+  config,
+  pkgs,
+  ...
+}: let
+  # You'll need to edit these values
+  # The hostname that will appear in your user and room IDs
+  server_name = "matrix.gladtherescake.eu";
+
+  # The hostname that Conduit actually runs on
+  #
+  # This can be the same as `server_name` if you want. This is only necessary
+  # when Conduit is running on a different machine than the one hosting your
+  # root domain. This configuration also assumes this is all running on a single
+  # machine, some tweaks will need to be made if this is not the case.
+  matrix_hostname = "${server_name}";
+
+  # Build a dervation that stores the content of `${server_name}/.well-known/matrix/server`
+  well_known_server = pkgs.writeText "well-known-matrix-server" ''
+    {
+      "m.server": "${matrix_hostname}"
+    }
+  '';
+
+  # Build a dervation that stores the content of `${server_name}/.well-known/matrix/client`
+  well_known_client = pkgs.writeText "well-known-matrix-client" ''
+    {
+      "m.homeserver": {
+        "base_url": "https://${matrix_hostname}"
+      }
+    }
+  '';
+in {
+  # Configure Conduit itself
+  services.matrix-conduit = {
+    enable = true;
+
+    # This causes NixOS to use the flake defined in this repository instead of
+    # the build of Conduit built into nixpkgs.
+    package = flake-inputs.conduit.packages.${pkgs.system}.default;
+
+    settings.global = {
+      inherit server_name;
+    };
+  };
+
+  # ACME data must be readable by the NGINX user
+  users.users.nginx.extraGroups = [
+    "acme"
+  ];
+
+  # Configure NGINX as a reverse proxy
+  services.nginx = {
+    enable = true;
+    recommendedProxySettings = true;
+
+    virtualHosts = {
+      "${matrix_hostname}" = {
+        forceSSL = true;
+        enableACME = true;
+
+        listen = [
+          {
+            addr = "0.0.0.0";
+            port = 443;
+            ssl = true;
+          }
+          {
+            addr = "[::]";
+            port = 443;
+            ssl = true;
+          }
+          {
+            addr = "0.0.0.0";
+            port = 8448;
+            ssl = true;
+          }
+          {
+            addr = "[::]";
+            port = 8448;
+            ssl = true;
+          }
+        ];
+
+        locations."/_matrix/" = {
+          proxyPass = "http://backend_conduit$request_uri";
+          proxyWebsockets = true;
+          extraConfig = ''
+            proxy_set_header Host $host;
+            proxy_buffering off;
+          '';
+        };
+
+        extraConfig = ''
+          merge_slashes off;
+        '';
+      };
+
+      "${server_name}" = {
+        forceSSL = true;
+        enableACME = true;
+
+        locations."=/.well-known/matrix/server" = {
+          # Use the contents of the derivation built previously
+          alias = "${well_known_server}";
+
+          extraConfig = ''
+            # Set the header since by default NGINX thinks it's just bytes
+            default_type application/json;
+          '';
+        };
+
+        locations."=/.well-known/matrix/client" = {
+          # Use the contents of the derivation built previously
+          alias = "${well_known_client}";
+
+          extraConfig = ''
+            # Set the header since by default NGINX thinks it's just bytes
+            default_type application/json;
+
+            # https://matrix.org/docs/spec/client_server/r0.4.0#web-browser-clients
+            add_header Access-Control-Allow-Origin "*";
+          '';
+        };
+      };
+    };
+
+    upstreams = {
+      "backend_conduit" = {
+        servers = {
+          "[::1]:${toString config.services.matrix-conduit.settings.global.port}" = {};
+        };
+      };
+    };
+  };
+
+  # Open firewall ports for HTTP, HTTPS, and Matrix federation
+  networking.firewall.allowedTCPPorts = [80 443 8448];
+  networking.firewall.allowedUDPPorts = [80 443 8448];
+}