Settings page for analytics ID

appengine/gaemiddleware/settings.go

Index: appengine/gaemiddleware/settings.go
diff --git a/appengine/gaemiddleware/settings.go b/appengine/gaemiddleware/settings.go
index 349e724d8fb57aa038644ba4785348051ae4ba33..0efa118fe6409451917dada9ab32463d26ba989b 100644
--- a/appengine/gaemiddleware/settings.go
+++ b/appengine/gaemiddleware/settings.go
@@ -32,6 +32,10 @@ type gaeSettings struct {
 	// DisableDSCache is true to disable dscache (the memcache layer on top of
 	// the datastore).
 	DisableDSCache settings.YesOrNo `json:"disable_dscache"`
+
+	// AnalyticsID is a Google Analytics ID an admin can set to enable Analytics.
+	// The app must support analytics for this to work.
+	AnalyticsID string `json:"analytics_id"`
 }
 
 // fetchCachedSettings fetches gaeSettings from the settings store or panics.
@@ -54,6 +58,7 @@ func fetchCachedSettings(c context.Context) gaeSettings {
 		return gaeSettings{
 			LoggingLevel:   logging.Debug,
 			DisableDSCache: false,
+			AnalyticsID:    "",
 		}
 	default:
 		panic(fmt.Errorf("could not fetch GAE settings - %s", err))
@@ -100,6 +105,14 @@ dscache documentation</a> for more information. Toggling this on and off has
 consequences: <b>memcache is completely flushed</b>. Do not toy with this
 setting.`,
 		}),
+		{
+			ID:    "AnalyticsID",
+			Title: "Google Analytics Trakcing ID",
+			Type:  settings.UIFieldText,
+			Help: `Tracking ID used for Google Analytics.  Filling this in does not
+by itself add analytics to the app, it must be embedded in the HTML templates
+by calling <TODO: WHAT?>`,
+		},
 	}, nil
 }
 
@@ -112,6 +125,7 @@ func (settingsUIPage) ReadSettings(c context.Context) (map[string]string, error)
 	return map[string]string{
 		"LoggingLevel":   s.LoggingLevel.String(),
 		"DisableDSCache": s.DisableDSCache.String(),
+		"AnalyticsID":    s.AnalyticsID,
 	}, nil
 }
 
@@ -123,6 +137,7 @@ func (settingsUIPage) WriteSettings(c context.Context, values map[string]string,
 	if err := modified.DisableDSCache.Set(values["DisableDSCache"]); err != nil {
 		return err
 	}
+	modified.AnalyticsID = values["AnalyticsID"]
 
 	// When switching dscache back on, wipe memcache.
 	existing := gaeSettings{}