V2 alpha - initial version (#172)

Initial alpha codebase for version 2 of WireGuard Portal.
This version is considered unstable and incomplete (for example, no public REST API)! 
Use with care!


Fixes/Implements the following issues:
 - OAuth support #154, #1 
 - New Web UI with internationalisation support #98, #107, #89, #62
 - Postgres Support #49 
 - Improved Email handling #47, #119 
 - DNS Search Domain support #46 
 - Bugfixes #94, #48 

---------

Co-authored-by: Fabian Wechselberger <wechselbergerf@hotmail.com>

internal/adapters/filesystem.go

@@ -0,0 +1,54 @@
+package adapters
+
+import (
+	"fmt"
+	"github.com/sirupsen/logrus"
+	"io"
+	"os"
+	"path/filepath"
+)
+
+type FilesystemRepo struct {
+	basePath string
+}
+
+func NewFileSystemRepository(basePath string) (*FilesystemRepo, error) {
+	if basePath == "" {
+		return nil, nil // no path, return empty repository
+	}
+
+	r := &FilesystemRepo{basePath: basePath}
+
+	if err := os.MkdirAll(r.basePath, os.ModePerm); err != nil {
+		return nil, fmt.Errorf("failed to create base directory %s: %w", basePath, err)
+	}
+
+	return r, nil
+}
+
+func (r *FilesystemRepo) WriteFile(path string, contents io.Reader) error {
+	filePath := filepath.Join(r.basePath, path)
+	parentDirectory := filepath.Dir(filePath)
+
+	if err := os.MkdirAll(parentDirectory, os.ModePerm); err != nil {
+		return fmt.Errorf("failed to create parent directory %s: %w", parentDirectory, err)
+	}
+
+	file, err := os.OpenFile(filePath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, os.ModePerm)
+	if err != nil {
+		return fmt.Errorf("failed to open file %s: %w", file.Name(), err)
+	}
+	defer func(file *os.File) {
+		if err := file.Close(); err != nil {
+			logrus.Errorf("failed to close file %s: %v", file.Name(), err)
+		}
+	}(file)
+
+	_, err = io.Copy(file, contents)
+	if err != nil {
+		return fmt.Errorf("failed to write file contents: %w", err)
+	}
+
+	return nil
+
+}