From df3be1718a351df2bfa3ec8e2d592faabb62515e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jaros=C5=82aw=20Wygoda?= <jaroslaw@wygoda.me>
Date: Tue, 13 Apr 2021 12:33:04 +0000
Subject: [PATCH] grafana: add google oauth2 config

Grafana supports Google OAuth2.
https://grafana.com/docs/grafana/latest/auth/google/
---
 nixos/modules/services/monitoring/grafana.nix | 59 ++++++++++++++-----
 1 file changed, 44 insertions(+), 15 deletions(-)

diff --git a/nixos/modules/services/monitoring/grafana.nix b/nixos/modules/services/monitoring/grafana.nix
index 86e306ab404a..4ebde6f9b107 100644
--- a/nixos/modules/services/monitoring/grafana.nix
+++ b/nixos/modules/services/monitoring/grafana.nix
@@ -42,6 +42,9 @@ let
     AUTH_ANONYMOUS_ENABLED = boolToString cfg.auth.anonymous.enable;
     AUTH_ANONYMOUS_ORG_NAME = cfg.auth.anonymous.org_name;
     AUTH_ANONYMOUS_ORG_ROLE = cfg.auth.anonymous.org_role;
+    AUTH_GOOGLE_ENABLED = boolToString cfg.auth.google.enable;
+    AUTH_GOOGLE_ALLOW_SIGN_UP = boolToString cfg.auth.google.allowSignUp;
+    AUTH_GOOGLE_CLIENT_ID = cfg.auth.google.clientId;
 
     ANALYTICS_REPORTING_ENABLED = boolToString cfg.analytics.reporting.enable;
 
@@ -528,23 +531,46 @@ in {
       };
     };
 
-    auth.anonymous = {
-      enable = mkOption {
-        description = "Whether to allow anonymous access.";
-        default = false;
-        type = types.bool;
+    auth = {
+      anonymous = {
+        enable = mkOption {
+          description = "Whether to allow anonymous access.";
+          default = false;
+          type = types.bool;
+        };
+        org_name = mkOption {
+          description = "Which organization to allow anonymous access to.";
+          default = "Main Org.";
+          type = types.str;
+        };
+        org_role = mkOption {
+          description = "Which role anonymous users have in the organization.";
+          default = "Viewer";
+          type = types.str;
+        };
       };
-      org_name = mkOption {
-        description = "Which organization to allow anonymous access to.";
-        default = "Main Org.";
-        type = types.str;
+      google = {
+        enable = mkOption {
+          description = "Whether to allow Google OAuth2.";
+          default = false;
+          type = types.bool;
+        };
+        allowSignUp = mkOption {
+          description = "Whether to allow sign up with Google OAuth2.";
+          default = false;
+          type = types.bool;
+        };
+        clientId = mkOption {
+          description = "Google OAuth2 client ID.";
+          default = "";
+          type = types.str;
+        };
+        clientSecretFile = mkOption {
+          description = "Google OAuth2 client secret.";
+          default = null;
+          type = types.nullOr types.path;
+        };
       };
-      org_role = mkOption {
-        description = "Which role anonymous users have in the organization.";
-        default = "Viewer";
-        type = types.str;
-      };
-
     };
 
     analytics.reporting = {
@@ -609,6 +635,9 @@ in {
         QT_QPA_PLATFORM = "offscreen";
       } // mapAttrs' (n: v: nameValuePair "GF_${n}" (toString v)) envOptions;
       script = ''
+        ${optionalString (cfg.auth.google.clientSecretFile != null) ''
+          export GF_AUTH_GOOGLE_CLIENT_SECRET="$(cat ${escapeShellArg cfg.auth.google.clientSecretFile})"
+        ''}
         ${optionalString (cfg.database.passwordFile != null) ''
           export GF_DATABASE_PASSWORD="$(cat ${escapeShellArg cfg.database.passwordFile})"
         ''}