UPDATE: Outh2 google

pkg/constants/provider.go

@@ -0,0 +1,14 @@
+package constants
+
+type ProviderType string
+
+const (
+	GoogleProvider   ProviderType = "google"
+	GithubProvider   ProviderType = "github"
+	FacebookProvider ProviderType = "facebook"
+	LocalProvider    ProviderType = "local"
+)
+
+func (p ProviderType) String() string {
+	return string(p)
+}