0.3.03

server/internal/config/remote_config.go

@@ -56,8 +56,9 @@ type RemoteConfigFeatures struct {
 }
 
 type RemoteConfigPresentation struct {
-	NavigationRailExpandedWidthDp int `json:"navigationRailExpandedWidthDp"`
-	NavigationContentShiftDp      int `json:"navigationContentShiftDp"`
+	NavigationRailExpandedWidthDp int    `json:"navigationRailExpandedWidthDp"`
+	NavigationContentShiftDp      int    `json:"navigationContentShiftDp"`
+	FontFamily                    string `json:"fontFamily"`
 }
 
 // The remainder of the document is deliberately declarative. A new server-side row or
@@ -160,6 +161,7 @@ func DefaultRemoteConfig() RemoteConfig {
 		Presentation: RemoteConfigPresentation{
 			NavigationRailExpandedWidthDp: 184,
 			NavigationContentShiftDp:      112,
+			FontFamily:                    "system",
 		},
 		Home: RemoteHomeConfig{
 			Sections:           []string{"continue", "for-you", "favorites", "latest-movies"},
@@ -262,6 +264,9 @@ func validateRemoteConfig(document RemoteConfig) error {
 	if shift < 80 || shift > 160 || shift >= width {
 		return fmt.Errorf("navigationContentShiftDp must be between 80 and 160 and less than the rail width")
 	}
+	if document.Presentation.FontFamily != "system" && document.Presentation.FontFamily != "inter" {
+		return fmt.Errorf("fontFamily must be system or inter")
+	}
 	if err := validateRemoteConfigSections(document); err != nil {
 		return err
 	}

server/internal/config/remote_config_test.go

@@ -19,6 +19,9 @@ func TestRemoteConfigDefaultsAreComplete(t *testing.T) {
 	if !document.ContinueWatching.IncludeNextUp || len(document.Home.Sections) == 0 {
 		t.Fatalf("central defaults are incomplete: %+v", document)
 	}
+	if document.Presentation.FontFamily != "system" {
+		t.Fatalf("font family = %q, want system", document.Presentation.FontFamily)
+	}
 }
 
 func TestRemoteConfigDefaultsMissingNewSectionsForOlderDocuments(t *testing.T) {
@@ -47,6 +50,16 @@ func TestRemoteConfigRejectsMalformedAndUnsafeDocuments(t *testing.T) {
 		t.Fatal("unknown fields were accepted")
 	}
 
+	document = DefaultRemoteConfig()
+	document.Presentation.FontFamily = "comic-sans"
+	raw, err = json.Marshal(document)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := loadRemoteConfig(string(raw)); err == nil {
+		t.Fatal("unknown font family was accepted")
+	}
+
 	document = DefaultRemoteConfig()
 	document.MinimumAppVersion = "0.3.0"
 	document.MaximumAppVersion = "0.2.54"