initial commit

auth/auth.go

@@ -0,0 +1,28 @@
+package auth
+
+// Authenticator is an interface for user authentication.
+type Authenticator interface {
+	Authenticate(user, password string) bool
+}
+
+// authenticator is an Authenticator that authenticates client by key-value pairs.
+type authenticator struct {
+	kvs map[string]string
+}
+
+// NewAuthenticator creates an Authenticator that authenticates client by pre-defined user mapping.
+func NewAuthenticator(kvs map[string]string) Authenticator {
+	return &authenticator{
+		kvs: kvs,
+	}
+}
+
+// Authenticate checks the validity of the provided user-password pair.
+func (au *authenticator) Authenticate(user, password string) bool {
+	if au == nil || len(au.kvs) == 0 {
+		return true
+	}
+
+	v, ok := au.kvs[user]
+	return ok && (v == "" || password == v)
+}