porting - part 4 done

garth/client/auth.go

@@ -0,0 +1,37 @@
+package client
+
+import (
+	"time"
+)
+
+// OAuth1Token represents OAuth 1.0a credentials
+type OAuth1Token struct {
+	Token       string
+	TokenSecret string
+	CreatedAt   time.Time
+}
+
+// Expired checks if token is expired (OAuth1 tokens typically don't expire but we'll implement for consistency)
+func (t *OAuth1Token) Expired() bool {
+	return false // OAuth1 tokens don't typically expire
+}
+
+// OAuth2Token represents OAuth 2.0 credentials
+type OAuth2Token struct {
+	AccessToken  string
+	RefreshToken string
+	TokenType    string
+	ExpiresIn    int
+	ExpiresAt    time.Time
+}
+
+// Expired checks if token is expired
+func (t *OAuth2Token) Expired() bool {
+	return time.Now().After(t.ExpiresAt)
+}
+
+// RefreshIfNeeded refreshes token if expired (implementation pending)
+func (t *OAuth2Token) RefreshIfNeeded(client *Client) error {
+	// Placeholder for token refresh logic
+	return nil
+}