Dashboard: Support configuring default timezone via config file (#27404)

Add a default timezone that the administrator can set in the settings. 
This setting is be used as default for the users timezone preference.
Can be used when creating Grafana instances without administrator 
intervention, in order to give user the correct default timezone.

Fixes #25654

conf/defaults.ini

@@ -823,4 +823,5 @@ interval_year = YYYY
 # Experimental feature
 use_browser_locale = false
 
-
+# Default timezone for user preferences. Options are 'browser' for the browser local timezone or a timezone name from IANA Time Zone database, e.g. 'UTC' or 'Europe/Amsterdam' etc.
+default_timezone = browser

conf/sample.ini

@@ -811,3 +811,6 @@
 
 # Experimental feature
 ;use_browser_locale = false
+
+# Default timezone for user preferences. Options are 'browser' for the browser local timezone or a timezone name from IANA Time Zone database, e.g. 'UTC' or 'Europe/Amsterdam' etc.
+;default_timezone = browser
\ No newline at end of file

docs/sources/administration/configuration.md

@@ -1426,3 +1426,6 @@ interval_year = YYYY
 Set this to `true` to have date formats be automatically be derived from browser locale. Defaults to `false`. This
 is an experimental feature right now with a few problems that remain unsolved.
 
+### default_timezone
+
+Used as the default timezone for user preferences. Can be either `browser` for the browser local timezone or a timezone name from IANA Time Zone database, e.g. `UTC` or `Europe/Amsterdam` etc.
\ No newline at end of file

docs/sources/administration/preferences.md

@@ -32,7 +32,7 @@ Your Grafana preferences include whether uses the dark or light theme, your home
 1. In the Preferences section, you can edit any of the following:
    - **UI Theme -** Click to set the **Dark** or **Light** to select a theme. **Default** is either the dark theme or the theme selected by your Grafana administrator.
    - **Home Dashboard -** Refer to [Set your personal home dashboard]({{< relref "change-home-dashboard.md#set-your-personal-home-dashboard" >}}) for more information.
-   - **Timezone -** Click to select an option in the **Timezone** list. Refer to [Time range controls]({{< relref "../dashboards/time-range-controls.md" >}}) for more information about Grafana time settings.
+   - **Timezone -** Click to select an option in the **Timezone** list. **Default** is either the browser local timezone or the timezone selected by your Grafana administrator. Refer to [Time range controls]({{< relref "../dashboards/time-range-controls.md" >}}) for more information about Grafana time settings.
 1. Click **Save**.
 
 ## View your assigned organizations

pkg/services/sqlstore/preferences.go

@@ -10,13 +10,13 @@ import (
 	"github.com/grafana/grafana/pkg/setting"
 )
 
-func init() {
+func (ss *SqlStore) addPreferencesQueryAndCommandHandlers() {
 	bus.AddHandler("sql", GetPreferences)
-	bus.AddHandler("sql", GetPreferencesWithDefaults)
+	bus.AddHandler("sql", ss.GetPreferencesWithDefaults)
 	bus.AddHandler("sql", SavePreferences)
 }
 
-func GetPreferencesWithDefaults(query *models.GetPreferencesWithDefaultsQuery) error {
+func (ss *SqlStore) GetPreferencesWithDefaults(query *models.GetPreferencesWithDefaultsQuery) error {
 	params := make([]interface{}, 0)
 	filter := ""
 
@@ -43,7 +43,7 @@ func GetPreferencesWithDefaults(query *models.GetPreferencesWithDefaultsQuery) e
 
 	res := &models.Preferences{
 		Theme:           setting.DefaultTheme,
-		Timezone:        "browser",
+		Timezone:        ss.Cfg.DateFormats.DefaultTimezone,
 		HomeDashboardId: 0,
 	}
 

pkg/services/sqlstore/preferences_test.go

@@ -11,14 +11,17 @@ import (
 
 func TestPreferencesDataAccess(t *testing.T) {
 	Convey("Testing preferences data access", t, func() {
-		InitTestDB(t)
+		ss := InitTestDB(t)
 
 		Convey("GetPreferencesWithDefaults with no saved preferences should return defaults", func() {
+			setting.DefaultTheme = "light"
+			ss.Cfg.DateFormats.DefaultTimezone = "UTC"
+
 			query := &models.GetPreferencesWithDefaultsQuery{User: &models.SignedInUser{}}
-			err := GetPreferencesWithDefaults(query)
+			err := ss.GetPreferencesWithDefaults(query)
 			So(err, ShouldBeNil)
-			So(query.Result.Theme, ShouldEqual, setting.DefaultTheme)
-			So(query.Result.Timezone, ShouldEqual, "browser")
+			So(query.Result.Theme, ShouldEqual, "light")
+			So(query.Result.Timezone, ShouldEqual, "UTC")
 			So(query.Result.HomeDashboardId, ShouldEqual, 0)
 		})
 
@@ -29,7 +32,7 @@ func TestPreferencesDataAccess(t *testing.T) {
 			So(err, ShouldBeNil)
 
 			query := &models.GetPreferencesWithDefaultsQuery{User: &models.SignedInUser{OrgId: 1, UserId: 1}}
-			err = GetPreferencesWithDefaults(query)
+			err = ss.GetPreferencesWithDefaults(query)
 			So(err, ShouldBeNil)
 			So(query.Result.HomeDashboardId, ShouldEqual, 4)
 		})
@@ -41,7 +44,7 @@ func TestPreferencesDataAccess(t *testing.T) {
 			So(err, ShouldBeNil)
 
 			query := &models.GetPreferencesWithDefaultsQuery{User: &models.SignedInUser{OrgId: 1, UserId: 2}}
-			err = GetPreferencesWithDefaults(query)
+			err = ss.GetPreferencesWithDefaults(query)
 			So(err, ShouldBeNil)
 			So(query.Result.HomeDashboardId, ShouldEqual, 1)
 		})
@@ -57,7 +60,7 @@ func TestPreferencesDataAccess(t *testing.T) {
 			query := &models.GetPreferencesWithDefaultsQuery{
 				User: &models.SignedInUser{OrgId: 1, Teams: []int64{2, 3}},
 			}
-			err = GetPreferencesWithDefaults(query)
+			err = ss.GetPreferencesWithDefaults(query)
 			So(err, ShouldBeNil)
 			So(query.Result.HomeDashboardId, ShouldEqual, 3)
 		})
@@ -71,7 +74,7 @@ func TestPreferencesDataAccess(t *testing.T) {
 			So(err, ShouldBeNil)
 
 			query := &models.GetPreferencesWithDefaultsQuery{User: &models.SignedInUser{OrgId: 1}}
-			err = GetPreferencesWithDefaults(query)
+			err = ss.GetPreferencesWithDefaults(query)
 			So(err, ShouldBeNil)
 			So(query.Result.HomeDashboardId, ShouldEqual, 1)
 		})
@@ -89,7 +92,7 @@ func TestPreferencesDataAccess(t *testing.T) {
 			query := &models.GetPreferencesWithDefaultsQuery{
 				User: &models.SignedInUser{OrgId: 1, UserId: 1, Teams: []int64{2, 3}},
 			}
-			err = GetPreferencesWithDefaults(query)
+			err = ss.GetPreferencesWithDefaults(query)
 			So(err, ShouldBeNil)
 			So(query.Result.HomeDashboardId, ShouldEqual, 4)
 		})
@@ -107,7 +110,7 @@ func TestPreferencesDataAccess(t *testing.T) {
 			query := &models.GetPreferencesWithDefaultsQuery{
 				User: &models.SignedInUser{OrgId: 1, UserId: 2},
 			}
-			err = GetPreferencesWithDefaults(query)
+			err = ss.GetPreferencesWithDefaults(query)
 			So(err, ShouldBeNil)
 			So(query.Result.HomeDashboardId, ShouldEqual, 1)
 		})

pkg/services/sqlstore/sqlstore.go

@@ -102,6 +102,7 @@ func (ss *SqlStore) Init() error {
 	// Register handlers
 	ss.addUserQueryAndCommandHandlers()
 	ss.addAlertNotificationUidByIdHandler()
+	ss.addPreferencesQueryAndCommandHandlers()
 
 	err = ss.logOrgsNotice()
 	if err != nil {

pkg/setting/date_formats.go

 package setting
 
+import (
+	"time"
+
+	"gopkg.in/ini.v1"
+)
+
 type DateFormats struct {
 	FullDate         string              `json:"fullDate"`
 	UseBrowserLocale bool                `json:"useBrowserLocale"`
 	Interval         DateFormatIntervals `json:"interval"`
+	DefaultTimezone  string              `json:"defaultTimezone"`
 }
 
 type DateFormatIntervals struct {
@@ -15,6 +22,23 @@ type DateFormatIntervals struct {
 	Year   string `json:"year"`
 }
 
+const LocalBrowserTimezone = "browser"
+
+func valueAsTimezone(section *ini.Section, keyName string, defaultValue string) (string, error) {
+	timezone := section.Key(keyName).MustString(defaultValue)
+
+	if timezone == LocalBrowserTimezone {
+		return LocalBrowserTimezone, nil
+	}
+
+	location, err := time.LoadLocation(timezone)
+	if err != nil {
+		return LocalBrowserTimezone, err
+	}
+
+	return location.String(), nil
+}
+
 func (cfg *Cfg) readDateFormats() {
 	dateFormats := cfg.Raw.Section("date_formats")
 	cfg.DateFormats.FullDate = valueAsString(dateFormats, "full_date", "YYYY-MM-DD HH:mm:ss")
@@ -25,4 +49,10 @@ func (cfg *Cfg) readDateFormats() {
 	cfg.DateFormats.Interval.Month = valueAsString(dateFormats, "interval_month", "YYYY-MM")
 	cfg.DateFormats.Interval.Year = "YYYY"
 	cfg.DateFormats.UseBrowserLocale = dateFormats.Key("date_format_use_browser_locale").MustBool(false)
+
+	timezone, err := valueAsTimezone(dateFormats, "default_timezone", LocalBrowserTimezone)
+	if err != nil {
+		cfg.Logger.Warn("Unknown timezone as default_timezone", "err", err)
+	}
+	cfg.DateFormats.DefaultTimezone = timezone
 }

pkg/setting/date_formats_test.go

+package setting
+
+import (
+	"testing"
+
+	"gopkg.in/ini.v1"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValueAsTimezone(t *testing.T) {
+	tests := map[string]struct {
+		output string
+		hasErr bool
+	}{
+		"browser":          {"browser", false},
+		"UTC":              {"UTC", false},
+		"utc":              {"browser", true},
+		"Amsterdam":        {"browser", true},
+		"europe/amsterdam": {"browser", true},
+		"Europe/Amsterdam": {"Europe/Amsterdam", false},
+	}
+
+	sec, err := ini.Empty().NewSection("test")
+	assert.NoError(t, err)
+	key, err := sec.NewKey("test", "")
+	assert.NoError(t, err)
+
+	for input, expected := range tests {
+		key.SetValue(input)
+
+		output, err := valueAsTimezone(sec, "test", "default")
+
+		assert.Equal(t, expected.hasErr, err != nil, "Invalid has err for input: %s err: %v", input, err)
+		assert.Equal(t, expected.output, output, "Invalid output for input: %s", input)
+	}
+}