// Copyright 2025 Stefan Prodan.
// SPDX-License-Identifier: AGPL-3.0
package web
import (
"io/fs"
"path/filepath"
"strings"
)
// FileSystem wraps an embedded filesystem to handle SPA routing.
// It serves index.html for all non-existent file requests (404s).
type FileSystem struct {
fs fs.FS
}
// NewFileSystem creates a new filesystem handler for SPA routing.
func NewFileSystem(efs fs.FS) *FileSystem {
return &FileSystem{fs: efs}
}
// Open implements fs.FS interface for SPA routing.
func (w *FileSystem) Open(name string) (fs.File, error) {
// Normalize path
name = strings.TrimPrefix(name, "/")
// Try to open the requested file
f, err := w.fs.Open(filepath.Join("dist", name))
if err == nil {
// File exists, return it
return f, nil
}
// If it's not a directory request and the file doesn't exist,
// serve index.html for SPA routing
if !strings.HasSuffix(name, "/") {
indexPath := filepath.Join("dist", "index.html")
f, err := w.fs.Open(indexPath)
if err == nil {
return f, nil
}
}
// Return original error if we can't fall back to index.html
return nil, err
}
