From efc1f271711fbbbf06543c1d4883f377019f8c84 Mon Sep 17 00:00:00 2001
From: Florian Forster <ff@octo.it>
Date: Mon, 29 Jan 2018 10:27:16 +0100
Subject: [PATCH] Read runtime configuration from datastore.

---
 app/config.go    | 28 ++++++++++++++++++++++++++++
 fitbit/fitbit.go |  4 ++--
 gfit/gfit.go     |  8 ++++----
 kraftakt.go      |  6 +++++-
 4 files changed, 39 insertions(+), 7 deletions(-)
 create mode 100644 app/config.go

diff --git a/app/config.go b/app/config.go
new file mode 100644
index 0000000..f05a9e6
--- /dev/null
+++ b/app/config.go
@@ -0,0 +1,28 @@
+package app
+
+import (
+	"context"
+
+	"google.golang.org/appengine/datastore"
+	"google.golang.org/appengine/log"
+)
+
+var Config struct {
+	ProjectNumber string
+
+	FitbitClientID       string
+	FitbitClientSecret   string
+	FitbitSubscriberCode string
+
+	GoogleClientID     string
+	GoogleClientSecret string
+}
+
+func LoadConfig(ctx context.Context) error {
+	key := datastore.NewKey(ctx, "Config", "Production", 0, nil)
+	if err := datastore.Get(ctx, key, &Config); err != nil {
+		log.Errorf(ctx, `datastore.Get("Config", "Production") = %v`, err)
+		return err
+	}
+	return nil
+}
diff --git a/fitbit/fitbit.go b/fitbit/fitbit.go
index 90457d2..5c967b1 100644
--- a/fitbit/fitbit.go
+++ b/fitbit/fitbit.go
@@ -18,8 +18,8 @@ import (
 )
 
 var oauth2Config = &oauth2.Config{
-	ClientID:     "@FITBIT_CLIENT_ID@",
-	ClientSecret: "@FITBIT_CLIENT_SECRET@",
+	ClientID:     app.Config.FitbitClientID,
+	ClientSecret: app.Config.FitbitClientSecret,
 	Endpoint:     oauth2fitbit.Endpoint,
 	RedirectURL:  "https://kraftakt.octo.it/fitbit/grant",
 	Scopes: []string{
diff --git a/gfit/gfit.go b/gfit/gfit.go
index 69308a7..1599799 100644
--- a/gfit/gfit.go
+++ b/gfit/gfit.go
@@ -29,8 +29,8 @@ const (
 )
 
 var oauthConfig = &oauth2.Config{
-	ClientID:     "@GOOGLE_CLIENT_ID@",
-	ClientSecret: "@GOOGLE_CLIENT_SECRET@",
+	ClientID:     app.Config.GoogleClientID,
+	ClientSecret: app.Config.GoogleClientSecret,
 	Endpoint:     oauth2google.Endpoint,
 	RedirectURL:  "https://kraftakt.octo.it/google/grant",
 	Scopes: []string{
@@ -42,7 +42,7 @@ var oauthConfig = &oauth2.Config{
 
 func Application(ctx context.Context) *fitness.Application {
 	return &fitness.Application{
-		Name:       "Fitbit to Google Fit sync",
+		Name:       "Kraftakt",
 		Version:    appengine.VersionID(ctx),
 		DetailsUrl: "", // optional
 	}
@@ -89,7 +89,7 @@ func DataStreamID(dataSource *fitness.DataSource) string {
 	fields := []string{
 		dataSource.Type,
 		dataSource.DataType.Name,
-		"@PROJECT_NUMBER@", // FIXME
+		app.Config.ProjectNumber,
 	}
 
 	if dev := dataSource.Device; dev != nil {
diff --git a/kraftakt.go b/kraftakt.go
index e0ad321..69815c2 100644
--- a/kraftakt.go
+++ b/kraftakt.go
@@ -28,6 +28,10 @@ func init() {
 	http.HandleFunc("/google/setup", googleSetupHandler)
 	http.Handle("/google/grant", AuthenticatedHandler(googleGrantHandler))
 	http.Handle("/", AuthenticatedHandler(indexHandler))
+
+	if err := app.LoadConfig(context.Background()); err != nil {
+		panic(err)
+	}
 }
 
 // ContextHandler implements http.Handler
@@ -171,7 +175,7 @@ func fitbitNotifyHandler(ctx context.Context, w http.ResponseWriter, r *http.Req
 	// this is used when setting up a new subscriber in the UI. Once set
 	// up, this code path should not be triggered.
 	if verify := r.FormValue("verify"); verify != "" {
-		if verify == "@FITBIT_SUBSCRIBER_CODE@" {
+		if verify == app.Config.FitbitSubscriberCode {
 			w.WriteHeader(http.StatusNoContent)
 		} else {
 			w.WriteHeader(http.StatusNotFound)
-- 
2.11.0