Create identity and access packages for IAM

iam/identity/adapter.go

@@ -0,0 +1,89 @@
+package identity
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"sync"
+
+	"github.com/datarhei/core/v16/io/fs"
+	"github.com/datarhei/core/v16/log"
+)
+
+type Adapter interface {
+	LoadIdentities() ([]User, error)
+	SaveIdentities(user []User) error
+}
+
+type fileAdapter struct {
+	fs       fs.Filesystem
+	filePath string
+	logger   log.Logger
+	lock     sync.Mutex
+}
+
+func NewJSONAdapter(fs fs.Filesystem, filePath string, logger log.Logger) (Adapter, error) {
+	a := &fileAdapter{
+		fs:       fs,
+		filePath: filePath,
+		logger:   logger,
+	}
+
+	if a.fs == nil {
+		return nil, fmt.Errorf("a filesystem must be provided")
+	}
+
+	if a.filePath == "" {
+		return nil, fmt.Errorf("invalid file path, file path cannot be empty")
+	}
+
+	if a.logger == nil {
+		a.logger = log.New("")
+	}
+
+	return a, nil
+}
+
+func (a *fileAdapter) LoadIdentities() ([]User, error) {
+	a.lock.Lock()
+	defer a.lock.Unlock()
+
+	if _, err := a.fs.Stat(a.filePath); os.IsNotExist(err) {
+		return nil, nil
+	}
+
+	data, err := a.fs.ReadFile(a.filePath)
+	if err != nil {
+		return nil, err
+	}
+
+	users := []User{}
+
+	err = json.Unmarshal(data, &users)
+	if err != nil {
+		return nil, err
+	}
+
+	a.logger.Debug().WithField("path", a.filePath).Log("Identity file loaded")
+
+	return users, nil
+}
+
+func (a *fileAdapter) SaveIdentities(user []User) error {
+	a.lock.Lock()
+	defer a.lock.Unlock()
+
+	jsondata, err := json.MarshalIndent(user, "", "    ")
+	if err != nil {
+		return err
+	}
+
+	_, _, err = a.fs.WriteFileSafe(a.filePath, jsondata)
+	if err != nil {
+		return err
+	}
+
+	a.logger.Debug().WithField("path", a.filePath).Log("Identity file save")
+
+	return nil
+}