refactor(auth): Centralize logging for saving credentials

The logic for logging the path where credentials are saved was duplicated across several client implementations.

This commit refactors this behavior by creating a new centralized function, `misc.LogSavingCredentials`, to handle this logging. The `SaveTokenToFile` method in each authentication token storage struct now calls this new function, ensuring consistent logging and reducing code duplication.

The redundant logging statements in the client-level `SaveTokenToFile` methods have been removed.

internal/auth/claude/token.go

@@ -8,6 +8,8 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+
+	"github.com/luispater/CLIProxyAPI/v5/internal/misc"
 )
 
 // ClaudeTokenStorage stores OAuth2 token information for Anthropic Claude API authentication.
@@ -46,6 +48,7 @@ type ClaudeTokenStorage struct {
 // Returns:
 //   - error: An error if the operation fails, nil otherwise
 func (ts *ClaudeTokenStorage) SaveTokenToFile(authFilePath string) error {
+	misc.LogSavingCredentials(authFilePath)
 	ts.Type = "claude"
 
 	// Create directory structure if it doesn't exist

internal/auth/codex/token.go

@@ -8,6 +8,8 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+
+	"github.com/luispater/CLIProxyAPI/v5/internal/misc"
 )
 
 // CodexTokenStorage stores OAuth2 token information for OpenAI Codex API authentication.
@@ -42,6 +44,7 @@ type CodexTokenStorage struct {
 // Returns:
 //   - error: An error if the operation fails, nil otherwise
 func (ts *CodexTokenStorage) SaveTokenToFile(authFilePath string) error {
+	misc.LogSavingCredentials(authFilePath)
 	ts.Type = "codex"
 	if err := os.MkdirAll(filepath.Dir(authFilePath), 0700); err != nil {
 		return fmt.Errorf("failed to create directory: %v", err)

internal/auth/gemini/gemini-web_token.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/luispater/CLIProxyAPI/v5/internal/misc"
 	log "github.com/sirupsen/logrus"
 )
 
@@ -21,6 +22,7 @@ type GeminiWebTokenStorage struct {
 
 // SaveTokenToFile serializes the Gemini Web token storage to a JSON file.
 func (ts *GeminiWebTokenStorage) SaveTokenToFile(authFilePath string) error {
+	misc.LogSavingCredentials(authFilePath)
 	ts.Type = "gemini-web"
 	if err := os.MkdirAll(filepath.Dir(authFilePath), 0700); err != nil {
 		return fmt.Errorf("failed to create directory: %v", err)

internal/auth/gemini/gemini_token.go

@@ -9,6 +9,7 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/luispater/CLIProxyAPI/v5/internal/misc"
 	log "github.com/sirupsen/logrus"
 )
 
@@ -45,6 +46,7 @@ type GeminiTokenStorage struct {
 // Returns:
 //   - error: An error if the operation fails, nil otherwise
 func (ts *GeminiTokenStorage) SaveTokenToFile(authFilePath string) error {
+	misc.LogSavingCredentials(authFilePath)
 	ts.Type = "gemini"
 	if err := os.MkdirAll(filepath.Dir(authFilePath), 0700); err != nil {
 		return fmt.Errorf("failed to create directory: %v", err)

internal/auth/qwen/qwen_token.go

@@ -8,6 +8,8 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+
+	"github.com/luispater/CLIProxyAPI/v5/internal/misc"
 )
 
 // QwenTokenStorage stores OAuth2 token information for Alibaba Qwen API authentication.
@@ -40,6 +42,7 @@ type QwenTokenStorage struct {
 // Returns:
 //   - error: An error if the operation fails, nil otherwise
 func (ts *QwenTokenStorage) SaveTokenToFile(authFilePath string) error {
+	misc.LogSavingCredentials(authFilePath)
 	ts.Type = "qwen"
 	if err := os.MkdirAll(filepath.Dir(authFilePath), 0700); err != nil {
 		return fmt.Errorf("failed to create directory: %v", err)

internal/client/gemini-cli_client.go

@@ -831,7 +831,6 @@ func (c *GeminiCLIClient) GetProjectList(ctx context.Context) (*interfaces.GCPPr
 //   - error: An error if the save operation fails, nil otherwise.
 func (c *GeminiCLIClient) SaveTokenToFile() error {
 	fileName := filepath.Join(c.cfg.AuthDir, fmt.Sprintf("%s-%s.json", c.tokenStorage.(*geminiAuth.GeminiTokenStorage).Email, c.tokenStorage.(*geminiAuth.GeminiTokenStorage).ProjectID))
-	log.Infof("Saving credentials to %s", fileName)
 	return c.tokenStorage.SaveTokenToFile(fileName)
 }
 

internal/client/gemini-web_client.go

@@ -842,7 +842,6 @@ func (c *GeminiWebClient) SaveTokenToFile() error {
 		}
 		return ts.SaveTokenToFile(c.tokenFilePath)
 	}
-	log.Debugf("Saving Gemini Web cookie snapshot to %s", filepath.Base(util.CookieSnapshotPath(c.tokenFilePath)))
 	return c.snapshotManager.Persist()
 }
 

internal/misc/credentials.go

@@ -0,0 +1,16 @@
+package misc
+
+import (
+	"path/filepath"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// LogSavingCredentials emits a consistent log message when persisting auth material.
+func LogSavingCredentials(path string) {
+	if path == "" {
+		return
+	}
+	// Use filepath.Clean so logs remain stable even if callers pass redundant separators.
+	log.Infof("Saving credentials to %s", filepath.Clean(path))
+}

internal/util/cookie_snapshot.go

@@ -6,15 +6,19 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+
+	"github.com/luispater/CLIProxyAPI/v5/internal/misc"
 )
 
+const cookieSnapshotExt = ".cookie"
+
 // CookieSnapshotPath derives the cookie snapshot file path from the main token JSON path.
-// It replaces the .json suffix with .cookies, or appends .cookies if missing.
+// It replaces the .json suffix with .cookie, or appends .cookie if missing.
 func CookieSnapshotPath(mainPath string) string {
 	if strings.HasSuffix(mainPath, ".json") {
-		return strings.TrimSuffix(mainPath, ".json") + ".cookies"
+		return strings.TrimSuffix(mainPath, ".json") + cookieSnapshotExt
 	}
-	return mainPath + ".cookies"
+	return mainPath + cookieSnapshotExt
 }
 
 // IsRegularFile reports whether the given path exists and is a regular file.
@@ -66,9 +70,8 @@ func RemoveFile(path string) error {
 	return nil
 }
 
-// TryReadCookieSnapshotInto tries to read a cookie snapshot into v.
-// It attempts the .cookies suffix; returns (true, nil) when found and decoded,
-// or (false, nil) when none exists.
+// TryReadCookieSnapshotInto tries to read a cookie snapshot into v using the .cookie suffix.
+// Returns (true, nil) when a snapshot was decoded, or (false, nil) when none exists.
 func TryReadCookieSnapshotInto(mainPath string, v any) (bool, error) {
 	snap := CookieSnapshotPath(mainPath)
 	if err := ReadJSON(snap, v); err != nil {
@@ -80,13 +83,20 @@ func TryReadCookieSnapshotInto(mainPath string, v any) (bool, error) {
 	return true, nil
 }
 
-// WriteCookieSnapshot writes v to the snapshot path derived from mainPath using the .cookies suffix.
+// WriteCookieSnapshot writes v to the snapshot path derived from mainPath using the .cookie suffix.
 func WriteCookieSnapshot(mainPath string, v any) error {
-	return WriteJSON(CookieSnapshotPath(mainPath), v)
+	path := CookieSnapshotPath(mainPath)
+	misc.LogSavingCredentials(path)
+	if err := WriteJSON(path, v); err != nil {
+		return err
+	}
+	return nil
 }
 
-// RemoveCookieSnapshots removes both modern and legacy snapshot files.
-func RemoveCookieSnapshots(mainPath string) { _ = RemoveFile(CookieSnapshotPath(mainPath)) }
+// RemoveCookieSnapshots removes the snapshot file if it exists.
+func RemoveCookieSnapshots(mainPath string) {
+	_ = RemoveFile(CookieSnapshotPath(mainPath))
+}
 
 // Hooks provide customization points for snapshot lifecycle operations.
 type Hooks[T any] struct {

internal/watcher/watcher.go

@@ -9,6 +9,7 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
+	"errors"
 	"io/fs"
 	"net/http"
 	"os"
@@ -141,7 +142,7 @@ func (w *Watcher) handleEvent(event fsnotify.Event) {
 	isConfigEvent := event.Name == w.configPath && (event.Op&fsnotify.Write == fsnotify.Write || event.Op&fsnotify.Create == fsnotify.Create)
 	isAuthJSON := strings.HasPrefix(event.Name, w.authDir) && strings.HasSuffix(event.Name, ".json")
 	if !isConfigEvent && !isAuthJSON {
-		// Ignore unrelated files (e.g., cookie snapshots *.cookies) and other noise.
+		// Ignore unrelated files (e.g., cookie snapshots *.cookie) and other noise.
 		return
 	}
 
@@ -417,9 +418,10 @@ func (w *Watcher) clientsToSlice(clientMap map[string]interfaces.Client) []inter
 // readAuthFileWithRetry attempts to read the auth file multiple times to work around
 // short-lived locks on Windows while token files are being written.
 func readAuthFileWithRetry(path string, attempts int, delay time.Duration) ([]byte, error) {
+	read := func(target string) ([]byte, error) {
 		var lastErr error
 		for i := 0; i < attempts; i++ {
-		data, err := os.ReadFile(path)
+			data, err := os.ReadFile(target)
 			if err == nil {
 				return data, nil
 			}
@@ -431,6 +433,27 @@ func readAuthFileWithRetry(path string, attempts int, delay time.Duration) ([]by
 		return nil, lastErr
 	}
 
+	candidates := []string{
+		util.CookieSnapshotPath(path),
+		path,
+	}
+
+	for idx, candidate := range candidates {
+		data, err := read(candidate)
+		if err == nil {
+			return data, nil
+		}
+		if errors.Is(err, os.ErrNotExist) {
+			if idx < len(candidates)-1 {
+				continue
+			}
+		}
+		return nil, err
+	}
+
+	return nil, os.ErrNotExist
+}
+
 // addOrUpdateClient handles the addition or update of a single client.
 func (w *Watcher) addOrUpdateClient(path string) {
 	data, errRead := readAuthFileWithRetry(path, authFileReadMaxAttempts, authFileReadRetryDelay)