add default language admin ui functionality

roomdb/interface.go

@@ -20,6 +20,8 @@ import (
 type RoomConfig interface {
 	GetPrivacyMode(context.Context) (PrivacyMode, error)
 	SetPrivacyMode(context.Context, PrivacyMode) error
+	GetDefaultLanguage(context.Context) (string, error)
+	SetDefaultLanguage(context.Context, string) error
 }
 
 // AuthFallbackService allows password authentication which might be helpful for scenarios

roomdb/sqlite/migrations/03-config.sql

@@ -1,18 +1,20 @@
 -- +migrate Up
--- the configuration settings for this room, currently only privacy modes
+-- the configuration settings for this room, currently privacy mode settings and the default translation for the room
 CREATE TABLE config (
     id integer NOT NULL PRIMARY KEY,
     privacyMode integer NOT NULL,    -- open, community, restricted
+    defaultLanguage TEXT NOT NULL,   -- a language tag, e.g. en, sv, de
 
     CHECK (id == 0) -- should only ever store one row
 );
 
 -- the config table will only ever contain one row: the rooms current settings
 -- we update that row whenever the config changes.
 -- to have something to update, we insert the first and only row at id 0
-INSERT INTO config (id, privacyMode) VALUES (
-    0,  -- the constant id we will query
-    2   -- community is the default mode unless overridden
+INSERT INTO config (id, privacyMode, defaultLanguage) VALUES (
+    0,     -- the constant id we will query
+    2,     -- community is the default mode unless overridden
+    "en"   -- english is the default language for all installs
 );
 
 -- +migrate Down

roomdb/sqlite/roomconfig.go

@@ -40,7 +40,6 @@ func (c Config) SetPrivacyMode(ctx context.Context, pm roomdb.PrivacyMode) error
 		return err
 	}
 
-	// cblgh: a walkthrough of this step (again, now that i have some actual context) would be real good :)
 	err = transact(c.db, func(tx *sql.Tx) error {
 		// get the settings row
 		config, err := models.FindConfig(ctx, tx, configRowID)
@@ -68,3 +67,46 @@ func (c Config) SetPrivacyMode(ctx context.Context, pm roomdb.PrivacyMode) error
 
 	return nil // alles gut!!
 }
+
+// TODO: use proper language tag from "golang.org/x/text/language"?
+func (c Config) GetDefaultLanguage(ctx context.Context) (string, error) {
+	config, err := models.FindConfig(ctx, c.db, configRowID)
+	if err != nil {
+		return "", err
+	}
+
+	return config.DefaultLanguage, nil
+}
+
+func (c Config) SetDefaultLanguage(ctx context.Context, langTag string) error {
+	if len(langTag) == 0 {
+		return fmt.Errorf("language tag cannot be empty")
+	}
+
+	err := transact(c.db, func(tx *sql.Tx) error {
+		// get the settings row
+		config, err := models.FindConfig(ctx, tx, configRowID)
+		if err != nil {
+			return err
+		}
+
+		// set the new language tag
+		config.DefaultLanguage = langTag
+		// issue update stmt
+		rowsAffected, err := config.Update(ctx, tx, boil.Infer())
+		if err != nil {
+			return err
+		}
+		if rowsAffected == 0 {
+			return fmt.Errorf("setting default language should have update the settings row, instead 0 rows were updated")
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		return err
+	}
+
+	return nil // alles gut!!
+}

web/handlers/admin/handler.go

@@ -22,6 +22,7 @@ import (
 	"github.com/ssb-ngi-pointer/go-ssb-room/web"
 	weberrors "github.com/ssb-ngi-pointer/go-ssb-room/web/errors"
 	"github.com/ssb-ngi-pointer/go-ssb-room/web/router"
+	"github.com/ssb-ngi-pointer/go-ssb-room/web/i18n"
 )
 
 // HTMLTemplates define the list of files the template system should load.
@@ -65,6 +66,7 @@ func Handler(
 	r *render.Renderer,
 	roomState *roomstate.Manager,
 	fh *weberrors.FlashHelper,
+	locHelper *i18n.Helper,
 	dbs Databases,
 ) http.Handler {
 	mux := &http.ServeMux{}
@@ -84,11 +86,12 @@ func Handler(
 	var sh = settingsHandler{
 		r:     r,
 		urlTo: urlTo,
-
 		db: dbs.Config,
+		loc: locHelper,
 	}
 	mux.HandleFunc("/settings", r.HTML("admin/settings.tmpl", sh.overview))
 	mux.HandleFunc("/settings/set-privacy", sh.setPrivacy)
+	mux.HandleFunc("/settings/set-language", sh.setLanguage)
 
 	mux.HandleFunc("/menu", r.HTML("admin/menu.tmpl", func(w http.ResponseWriter, req *http.Request) (interface{}, error) {
 		return map[string]interface{}{}, nil