Add basic and bypass auth methods

auth/basic/basic.go

@@ -0,0 +1,44 @@
+package basic
+
+import (
+	"errors"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+// To generate bcrypt hashed password from Python,
+// python3 -c 'import bcrypt; print(bcrypt.hashpw(b"PASSWORD", bcrypt.gensalt(rounds=15)).decode("ascii"))'
+
+// Options holds package configuration
+type Options struct {
+	// Username: hashedPassword
+	Credentials map[string]string
+}
+
+// Basic authentification backend
+type Basic struct {
+	Cfg *Options
+}
+
+// Login hashs password and compare
+// Returns (true, nil) if success
+func (a Basic) Login(username string, password string) (bool, error) {
+	hash, ok := a.Cfg.Credentials[username]
+	if !ok {
+		return false, errors.New("User not found in credentials")
+	}
+	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+
+	// Login succeeded if no error
+	return err == nil, err
+}
+
+// Close has no connection to close
+func (a Basic) Close() {
+}
+
+// New instanciates a new Basic authentification backend
+func New(cfg *Options) (Basic, error) {
+	backend := Basic{Cfg: cfg}
+	return backend, nil
+}