Timezone feature (#8185)

* Add supported timezones into config

Remove Timezone list creation in favor of timezone from configs

Add Timezone field to Users table

Clean up format of SupportedTimezones in config

* Remove unwanted change

* Add test for updating user timezone

* Add empty map[string]string if Timezone is null

* Add EnableTimezoneSelection config

* Revert back to map[string]string for ClientConfig

* Refactor SupportedTimezones into timezones.json

* Include timezones.json in TestConfigFlag

* Add timezone api endpoint

* Bump varchar size to 256 and setMaxSize in user_store

* Refactor LoadConfig to LoadConfig and LoadTimezoneConfig

* Remove unnecessary argument in LoadConfig, mail_test

* Add test for timezone endpoint

* Add license header

* Refactor timezones endpoint to system.go

* Add system base route to timezone endpoint

* db timezone upgrade in db v4.9

* Avoid saving SupportedTimezones to config.json

* Add timezonePath support in config

* Remove EnableTimezoneSelection from config

* Use return statement without return parameter

* Refactor test for SupportedTimezones

* Check for supportedTimezone != nil instead of using len

* Decouple SupportedTimezones out of Config

* Fix failing test

* Add LastTeamIconUpdate back in upgrade.go

* Write timezone config in config_flag_test

* Add code fallback for default timezone support

store/sqlstore/upgrade.go

@@ -4,6 +4,7 @@
 package sqlstore
 
 import (
+	"encoding/json"
 	"os"
 	"strings"
 	"time"
@@ -376,6 +377,12 @@ func UpgradeDatabaseToVersion49(sqlStore SqlStore) {
 	//TODO: Uncomment the following condition when version 4.9.0 is released
 	//if shouldPerformUpgrade(sqlStore, VERSION_4_8_0, VERSION_4_9_0) {
 	sqlStore.CreateColumnIfNotExists("Teams", "LastTeamIconUpdate", "bigint", "bigint", "0")
+	defaultTimezone := model.DefaultUserTimezone()
+	defaultTimezoneValue, err := json.Marshal(defaultTimezone)
+	if err != nil {
+		l4g.Critical(err)
+	}
+	sqlStore.CreateColumnIfNotExists("Users", "Timezone", "varchar(256)", "varchar(256)", string(defaultTimezoneValue))
 	//	saveSchemaVersion(sqlStore, VERSION_4_9_0)
 	//}
 }

store/sqlstore/user_store.go

@@ -79,6 +79,7 @@ func NewSqlUserStore(sqlStore SqlStore, metrics einterfaces.MetricsInterface) st
 		table.ColMap("Locale").SetMaxSize(5)
 		table.ColMap("MfaSecret").SetMaxSize(128)
 		table.ColMap("Position").SetMaxSize(128)
+		table.ColMap("Timezone").SetMaxSize(256)
 	}
 
 	return us