From 6513755670892983db88a6633b8c1ea6019c03d1 Mon Sep 17 00:00:00 2001
From: Ben Sima <ben@bsima.me>
Date: Fri, 15 Nov 2024 14:55:37 -0500
Subject: Re-namespace some stuff to Omni

I was getting confused about what is a product and what is internal
infrastructure; I think it is good to keep those things separate. So I moved a
bunch of stuff to an Omni namespace, actually most stuff went there. Only things
that are explicitly external products are still in the Biz namespace.
---
 Omni/Cloud/Chat.nix | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 Omni/Cloud/Chat.nix

(limited to 'Omni/Cloud/Chat.nix')

diff --git a/Omni/Cloud/Chat.nix b/Omni/Cloud/Chat.nix
new file mode 100644
index 0000000..7f86621
--- /dev/null
+++ b/Omni/Cloud/Chat.nix
@@ -0,0 +1,94 @@
+{ config, pkgs, ... }:
+#
+# a homeserver for matrix.org.
+#
+# this uses the config.networking.domain as the ACME host. be sure to add the
+# fqdn and element subdomains to security.acme.certs.<name>.extraDomainNames
+#
+# - nixos manual: https://nixos.org/nixos/manual/index.html#module-services-matrix
+#
+# to create new users:
+#
+#     nix run nixpkgs.matrix-synapse
+#     register_new_matrix_user -k <registration_shared_secret> http://localhost:<matrix_port>
+#
+let
+  fqdn = "matrix.${config.networking.domain}";
+  element = "chat.${config.networking.domain}";
+  matrix_port = 8448;
+in {
+  # matrix-synapse server. for what the settings mean, see:
+  # https://nixos.org/nixos/manual/index.html#module-services-matrix
+  #
+  services.matrix-synapse = {
+    enable = false;
+    settings.server_name = config.networking.domain;
+    #registration_shared_secret = "AkGRWSQLga3RoKRFnHhKoeCEIeZzu31y4TRzMRkMyRbBnETkVTSxilf24qySLzQn";
+    settings.listeners = [{
+      port = matrix_port;
+      bind_address = "::1";
+      type = "http";
+      tls = false;
+      x_forwarded = true;
+      resources = [{
+        names = [ "client" "federation" ];
+        compress = false;
+      }];
+    }];
+  };
+  # matrix needs a database
+  #
+  services.postgresql.enable = true;
+  # web proxy for the matrix server
+  #
+  services.nginx = {
+    enable = true;
+    recommendedTlsSettings = true;
+    recommendedOptimisation = true;
+    recommendedGzipSettings = true;
+    recommendedProxySettings = true;
+    virtualHosts = {
+      # route to matrix-synapse
+      "${config.networking.domain}" = {
+        locations."= /.well-known/matrix/server".extraConfig =
+          let server = { "m.server" = "${fqdn}:443"; };
+          in ''
+            add_header Content-Type application/json;
+            return 200 '${builtins.toJSON server}';
+          '';
+        locations."= /.well-known/matrix/client".extraConfig = let
+          client = {
+            "m.homeserver" = { "base_url" = "https://${fqdn}"; };
+            "m.identity_server" = { "base_url" = "https://vector.im"; };
+          };
+        in ''
+          add_header Content-Type application/json;
+          add_header Access-Control-Allow-Origin *;
+          return 200 '${builtins.toJSON client}';
+        '';
+      };
+      # reverse proxy for matrix client-server and server-server communication
+      "${fqdn}" = {
+        forceSSL = true;
+        useACMEHost = config.networking.domain;
+        locations."/".extraConfig = ''
+          return 404;
+        '';
+        locations."/_matrix" = {
+          proxyPass = "http://[::1]:${toString matrix_port}";
+        };
+      };
+    };
+  };
+  # matrix client, available at chat.simatime.com
+  #
+  # note that element and matrix-synapse must be on separate fqdn's to
+  # protect from XSS attacks:
+  # https://github.com/vector-im/element-web#important-security-note
+  #
+  services.nginx.virtualHosts."${element}" = {
+    useACMEHost = config.networking.domain;
+    forceSSL = true;
+    root = pkgs.element-web;
+  };
+}
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