Initial backend api

backend/internal/filesystem/filesystem.go

@@ -0,0 +1,37 @@
+package filesystem
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+type FileSystem struct {
+	RootDir string
+}
+
+func New(rootDir string) *FileSystem {
+	return &FileSystem{RootDir: rootDir}
+}
+
+func (fs *FileSystem) ListFilesRecursively() ([]string, error) {
+	var files []string
+
+	err := filepath.Walk(fs.RootDir, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+		if !info.IsDir() {
+			relPath, _ := filepath.Rel(fs.RootDir, path)
+			files = append(files, relPath)
+		}
+		return nil
+	})
+
+	return files, err
+}
+
+func (fs *FileSystem) GetFileContent(filePath string) ([]byte, error) {
+	fullPath := filepath.Join(fs.RootDir, filePath)
+	return ioutil.ReadFile(fullPath)
+}