clanModules: Add vaultwarden module. Add nginx module. Make matrix-synapse subdomain configurable

clanModules/nginx/README.md

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+---
+description = "Good defaults for the nginx webserver"
+---

clanModules/nginx/default.nix

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+{ config, lib, ... }:
+
+{
+
+  imports = [
+    (lib.mkRemovedOptionModule [
+      "clan"
+      "nginx"
+      "enable"
+    ] "Importing the module will already enable the service.")
+
+  ];
+  config = {
+
+    clan.core.facts.services."nginx-acme-email" = {
+      public."nginx-acme-email" = { };
+      generator.prompt = "Please enter your email address for Let's Encrypt certificate generation";
+
+      generator.script = ''
+        echo -n "$prompt_value" | tr -d "\n" > "$facts"/nginx-acme-email
+      '';
+    };
+    security.acme.acceptTerms = true;
+    security.acme.defaults.email =
+      lib.mkDefault
+        config.clan.core.facts.services."nginx-acme-email".public."nginx-acme-email".value;
+
+    networking.firewall.allowedTCPPorts = [
+      443
+      80
+    ];
+
+    services.nginx = {
+      enable = true;
+
+      statusPage = lib.mkDefault true;
+      recommendedBrotliSettings = lib.mkDefault true;
+      recommendedGzipSettings = lib.mkDefault true;
+      recommendedOptimisation = lib.mkDefault true;
+      recommendedProxySettings = lib.mkDefault true;
+      recommendedTlsSettings = lib.mkDefault true;
+      recommendedZstdSettings = lib.mkDefault true;
+
+      # Nginx sends all the access logs to /var/log/nginx/access.log by default.
+      # instead of going to the journal!
+      commonHttpConfig = "access_log syslog:server=unix:/dev/log;";
+
+      resolver.addresses =
+        let
+          isIPv6 = addr: builtins.match ".*:.*:.*" addr != null;
+          escapeIPv6 = addr: if isIPv6 addr then "[${addr}]" else addr;
+          cloudflare = [
+            "1.1.1.1"
+            "2606:4700:4700::1111"
+          ];
+          resolvers =
+            if config.networking.nameservers == [ ] then cloudflare else config.networking.nameservers;
+        in
+        map escapeIPv6 resolvers;
+
+      sslDhparam = config.security.dhparams.params.nginx.path;
+    };
+
+    security.dhparams = {
+      enable = true;
+      params.nginx = { };
+    };
+  };
+
+}