[linux] Attempt to handle 404

v2/internal/frontend/desktop/common/uri_translate.go

@@ -8,7 +8,7 @@ func TranslateUriToFile(uri string, expectedScheme string, expectedHost string)
 		return "", false, err
 	}
 
-	if url.Scheme != expectedScheme || url.Host != expectedHost {
+	if url.Scheme != expectedScheme || (len(expectedHost) > 0 && url.Host != expectedHost) {
 		return "", false, nil
 	}
 

v2/internal/frontend/desktop/linux/frontend.go

@@ -24,6 +24,7 @@ import "C"
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"log"
 	"os"
 	"strconv"
@@ -342,11 +343,22 @@ func (f *Frontend) processRequest(request unsafe.Pointer) {
 
 	// Load file from asset store
 	content, mimeType, err := f.assets.Load(file)
-	if err != nil {
-		return
-	}
 
 	// TODO How to return 404/500 errors to webkit?
+	if err != nil {
+		if os.IsNotExist(err) {
+			message := C.CString("not found")
+			defer C.free(unsafe.Pointer(message))
+			C.webkit_uri_scheme_request_finish_error(req, C.g_error_new_literal(C.G_FILE_ERROR_NOENT, C.int(404), message))
+		} else {
+			err = fmt.Errorf("Error processing request %s: %w", uri, err)
+			f.logger.Error(err.Error())
+			message := C.CString("internal server error")
+			defer C.free(unsafe.Pointer(message))
+			C.webkit_uri_scheme_request_finish_error(req, C.g_error_new_literal(C.G_FILE_ERROR_NOENT, C.int(500), message))
+		}
+		return
+	}
 
 	cContent := C.CString(string(content))
 	defer C.free(unsafe.Pointer(cContent))