1 files changed, 66 insertions, 0 deletions
diff --git a/sys/web/sites/matrix.nix b/sys/web/sites/matrix.nix
new file mode 100644
index 0000000..d27c00c
--- /dev/null
+++ b/sys/web/sites/matrix.nix
@@ -0,0 +1,66 @@
+{ config, lib, ... }:
+with lib; let
+  cfg = config.local.web.sites.matrix;
+  inherit (config.local) domains;
+in
+{
+  options.local.web.sites.matrix = {
+    enable = mkEnableOption "matrix proxy site";
+
+    proxyUrl = mkOption {
+      type = types.str;
+    };
+  };
+
+  config = mkIf cfg.enable {
+    local.web = {
+      enable = mkDefault true;
+      ownedCerts = [ "matrix" ];
+
+      sites.portal.enable = true;
+    };
+
+    services.nginx.virtualHosts = {
+      ${domains.exdev.www}.locations =
+        let
+          serverConfig."m.server" = "${domains.matrix.main}:443";
+          clientConfig."m.homeserver".base_url = "https://${domains.matrix.main}";
+
+          mkWellKnown = data: ''
+            default_type application/json;
+            add_header Access-Control-Allow-Origin *;
+            return 200 '${builtins.toJSON data}';
+          '';
+        in
+        {
+          "= /.well-known/matrix/server".extraConfig = mkWellKnown serverConfig;
+          "= /.well-known/matrix/client".extraConfig = mkWellKnown clientConfig;
+        };
+
+      ${domains.matrix.main} = {
+        forceSSL = true;
+        useACMEHost = domains.matrix.main;
+
+        locations =
+          let
+            proxyLocation =
+              throwIf (hasSuffix "/" cfg.proxyUrl)
+                "matrix site: a trailing slash *must not* be used here"
+                cfg.proxyUrl;
+          in
+          {
+            "/".extraConfig = ''
+              return 403;
+            '';
+
+            # Forward all Matrix API calls to the synapse Matrix homeserver. A trailing slash
+            # *must not* be used here.
+            "/_matrix".proxyPass = proxyLocation;
+
+            # Forward requests for e.g. SSO and password-resets.
+            "/_synapse/client".proxyPass = proxyLocation;
+          };
+      };
+    };
+  };
+}