Implement access to lang lists in the (current) app settings

app/boot_levels.go

@@ -32,6 +32,7 @@ import (
 	"github.com/cortezaproject/corteza-server/pkg/scheduler"
 	"github.com/cortezaproject/corteza-server/pkg/seeder"
 	"github.com/cortezaproject/corteza-server/pkg/sentry"
+	"github.com/cortezaproject/corteza-server/pkg/slice"
 	"github.com/cortezaproject/corteza-server/pkg/websocket"
 	"github.com/cortezaproject/corteza-server/store"
 	sysService "github.com/cortezaproject/corteza-server/system/service"
@@ -491,6 +492,8 @@ func (app *CortezaApp) Activate(ctx context.Context) (err error) {
 		updateAuthSettings(app.AuthService, appSettings)
 	})
 
+	updateLocaleSettings()
+
 	app.AuthService.Watch(ctx)
 
 	// messagebus reloader and consumer listeners
@@ -589,3 +592,60 @@ func updateAuthSettings(svc authServicer, current *types.AppSettings) {
 func updateFederationSettings(opt options.FederationOpt, current *types.AppSettings) {
 	current.Federation.Enabled = opt.Enabled
 }
+
+// Sanitizes application (current) settings with languages from options
+//
+// It updates ui.languages and resource-translations.languages slices
+//
+// # ui.languages
+// These need to be a subset of LOCALE_LANGUAGES (we'll use the list of parsed languages)
+//
+// # resource-translations.languages
+// These do not need to be subset of LOCALE_LANGUAGES but need to be valid language tags!
+func updateLocaleSettings() {
+	configuredLanguages := func() []string {
+		tt := locale.Global().Tags()
+		out := make([]string, len(tt))
+		for t := range tt {
+			out[t] = tt[t].String()
+		}
+
+		return out
+	}
+
+	updateUILanguages := func(appSettings *types.AppSettings) {
+		if len(appSettings.UI.Languages) == 0 {
+			appSettings.UI.Languages = configuredLanguages()
+		} else {
+			appSettings.UI.Languages = slice.IntersectStrings(configuredLanguages(), appSettings.UI.Languages)
+		}
+	}
+
+	updateResourceLanguages := func(appSettings *types.AppSettings) {
+		if len(appSettings.UI.Languages) == 0 {
+			appSettings.ResourceTranslations.Languages = configuredLanguages()
+		} else {
+			appSettings.ResourceTranslations.Languages = slice.IntersectStrings(configuredLanguages(), appSettings.UI.Languages)
+		}
+	}
+
+	updateUILanguages(sysService.CurrentSettings)
+	sysService.DefaultSettings.Register("ui.languages", func(ctx context.Context, current interface{}, _ types.SettingValueSet) {
+		appSettings, is := current.(*types.AppSettings)
+		if !is {
+			return
+		}
+
+		updateUILanguages(appSettings)
+	})
+
+	updateResourceLanguages(sysService.CurrentSettings)
+	sysService.DefaultSettings.Register("resource-translations.languages", func(ctx context.Context, current interface{}, _ types.SettingValueSet) {
+		appSettings, is := current.(*types.AppSettings)
+		if !is {
+			return
+		}
+
+		updateResourceLanguages(appSettings)
+	})
+}

system/rest/settings.go

@@ -98,8 +98,6 @@ func (ctrl *Settings) Set(ctx context.Context, r *request.SettingsSet) (interfac
 // Current settings, structured
 //
 // This is available to all authenticated users
-//
-// @todo selectively apply subset of user's own settings (like ui.one.panes.*)
 func (ctrl *Settings) Current(ctx context.Context, r *request.SettingsCurrent) (interface{}, error) {
 	return service.CurrentSettings, nil
 }

system/types/app_settings.go

@@ -12,7 +12,7 @@ const (
 type (
 	// AppSettings type is structured representation of all application settings
 	//
-	// Raw settings keys are hypen (kebab) case, separated with a dot (.) that indicates sub-level
+	// Raw settings keys are hyphen (kebab) case, separated with a dot (.) that indicates sub-level
 	// JSON properties for settings are NOT converted (lower-cased, etc...)
 	// Use `json:"-"` tag to hide settings on REST endpoint
 	AppSettings struct {
@@ -172,7 +172,34 @@ type (
 		UI struct {
 			MainLogo string `kv:"main-logo" json:"mainLogo"`
 			IconLogo string `kv:"icon-logo" json:"iconLogo"`
+
+			// List of all languages (UI translations) enabled and available
+			//
+			// Always a subset of all languages available
+			// in Corteza instance (LOCALE_LANGUAGES)
+			//
+			// 1st language in the set is also a default one
+			//
+			// Empty slice defaults to LOCALE_LANGUAGES
+			Languages []string `kv:"languages" json:"languages"`
 		} `kv:"ui" json:"ui"`
+
+		ResourceTranslations struct {
+			// List of all languages (resource translations) enabled and
+			// available for resource translations (these are module names,
+			// field labels, descriptions, ...)
+
+			// Always a subset of all languages available
+			// in Corteza instance (LOCALE_LANGUAGES)
+			//
+			// Note: later, we will enable this to contain languages
+			//       that are not part of LOCALE_LANGUAGES
+			//
+			// 1st language in the set is also a default one
+			//
+			// Empty slice defaults to LOCALE_LANGUAGES
+			Languages []string `kv:"languages" json:"languages"`
+		} `kv:"resource-translations" json:"resourceTranslations"`
 	}
 
 	ExternalAuthProviderSet []*ExternalAuthProvider