From 46c66debb231d8949f72c1dfc96268590d500ff5 Mon Sep 17 00:00:00 2001
From: Max <max@privatevoid.net>
Date: Sun, 17 Oct 2021 00:22:17 +0200
Subject: [PATCH] modules/backports: secret file support for coturn

---
 .../coturn-static-auth-secret-file.nix        | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 modules/backports/coturn-static-auth-secret-file.nix

diff --git a/modules/backports/coturn-static-auth-secret-file.nix b/modules/backports/coturn-static-auth-secret-file.nix
new file mode 100644
index 0000000..89d1eb1
--- /dev/null
+++ b/modules/backports/coturn-static-auth-secret-file.nix
@@ -0,0 +1,76 @@
+# based on https://github.com/NixOS/nixpkgs/pull/129059
+# FIXME: this module does not verify duplicate settings
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  cfg = config.services.coturn;
+  pidfile = "/run/turnserver/turnserver.pid";
+  # unfortunately, we need to re-render the entire config file ourselves
+  configFile = pkgs.writeText "turnserver.conf" ''
+listening-port=${toString cfg.listening-port}
+tls-listening-port=${toString cfg.tls-listening-port}
+alt-listening-port=${toString cfg.alt-listening-port}
+alt-tls-listening-port=${toString cfg.alt-tls-listening-port}
+${concatStringsSep "\n" (map (x: "listening-ip=${x}") cfg.listening-ips)}
+${concatStringsSep "\n" (map (x: "relay-ip=${x}") cfg.relay-ips)}
+min-port=${toString cfg.min-port}
+max-port=${toString cfg.max-port}
+${lib.optionalString cfg.lt-cred-mech "lt-cred-mech"}
+${lib.optionalString cfg.no-auth "no-auth"}
+${lib.optionalString cfg.use-auth-secret "use-auth-secret"}
+${lib.optionalString (cfg.static-auth-secret != null) ("static-auth-secret=${cfg.static-auth-secret}")}
+realm=${cfg.realm}
+${lib.optionalString cfg.no-udp "no-udp"}
+${lib.optionalString cfg.no-tcp "no-tcp"}
+${lib.optionalString cfg.no-tls "no-tls"}
+${lib.optionalString cfg.no-dtls "no-dtls"}
+${lib.optionalString cfg.no-udp-relay "no-udp-relay"}
+${lib.optionalString cfg.no-tcp-relay "no-tcp-relay"}
+${lib.optionalString (cfg.cert != null) "cert=${cfg.cert}"}
+${lib.optionalString (cfg.pkey != null) "pkey=${cfg.pkey}"}
+${lib.optionalString (cfg.dh-file != null) ("dh-file=${cfg.dh-file}")}
+no-stdout-log
+syslog
+pidfile=${pidfile}
+${lib.optionalString cfg.secure-stun "secure-stun"}
+${lib.optionalString cfg.no-cli "no-cli"}
+cli-ip=${cfg.cli-ip}
+cli-port=${toString cfg.cli-port}
+${lib.optionalString (cfg.cli-password != null) ("cli-password=${cfg.cli-password}")}
+${cfg.extraConfig}
+'';
+in
+{
+  options = {
+    services.coturn = {
+      static-auth-secret-file = mkOption {
+        type = types.nullOr types.str;
+        default = null;
+        description = ''
+          Path to the file containing the static authentication secret.
+        '';
+      };
+    };
+  };
+  config = mkIf cfg.enable {
+    systemd.services.coturn = let
+      runConfig = "/run/coturn/turnserver.cfg";
+    in {
+      preStart = ''
+        cat ${configFile} > ${runConfig}
+        ${optionalString (cfg.static-auth-secret-file != null) ''
+          STATIC_AUTH_SECRET="$(head -n1 ${cfg.static-auth-secret-file} || :)"
+          echo "static-auth-secret=$STATIC_AUTH_SECRET" >> ${runConfig}
+        '' }
+        chmod 640 ${runConfig}
+      '';
+
+      serviceConfig = {
+        ExecStart = mkForce "${pkgs.coturn}/bin/turnserver -c ${runConfig}";
+      };
+    };
+    systemd.tmpfiles.rules = [
+      "d  /run/coturn 0700 turnserver turnserver - -"
+    ];
+  };
+}