Add openai codex support

internal/auth/codex/token.go

@@ -0,0 +1,51 @@
+package codex
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path"
+)
+
+// CodexTokenStorage extends the existing GeminiTokenStorage for OpenAI-specific data
+// It maintains compatibility with the existing auth system while adding OpenAI-specific fields
+type CodexTokenStorage struct {
+	// IDToken is the JWT ID token containing user claims
+	IDToken string `json:"id_token"`
+	// AccessToken is the OAuth2 access token for API access
+	AccessToken string `json:"access_token"`
+	// RefreshToken is used to obtain new access tokens
+	RefreshToken string `json:"refresh_token"`
+	// AccountID is the OpenAI account identifier
+	AccountID string `json:"account_id"`
+	// LastRefresh is the timestamp of the last token refresh
+	LastRefresh string `json:"last_refresh"`
+	// Email is the OpenAI account email
+	Email string `json:"email"`
+	// Type indicates the type (gemini, chatgpt, claude) of token storage.
+	Type string `json:"type"`
+	// Expire is the timestamp of the token expire
+	Expire string `json:"expired"`
+}
+
+// SaveTokenToFile serializes the token storage to a JSON file.
+func (ts *CodexTokenStorage) SaveTokenToFile(authFilePath string) error {
+	ts.Type = "codex"
+	if err := os.MkdirAll(path.Dir(authFilePath), 0700); err != nil {
+		return fmt.Errorf("failed to create directory: %v", err)
+	}
+
+	f, err := os.Create(authFilePath)
+	if err != nil {
+		return fmt.Errorf("failed to create token file: %w", err)
+	}
+	defer func() {
+		_ = f.Close()
+	}()
+
+	if err = json.NewEncoder(f).Encode(ts); err != nil {
+		return fmt.Errorf("failed to write token to file: %w", err)
+	}
+	return nil
+
+}