add tokenSource support for auth configuration (#4865)

pkg/config/v1/client_test.go

@@ -15,6 +15,8 @@
 package v1
 
 import (
+	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/samber/lo"
@@ -24,7 +26,8 @@ import (
 func TestClientConfigComplete(t *testing.T) {
 	require := require.New(t)
 	c := &ClientConfig{}
-	c.Complete()
+	err := c.Complete()
+	require.NoError(err)
 
 	require.EqualValues("token", c.Auth.Method)
 	require.Equal(true, lo.FromPtr(c.Transport.TCPMux))
@@ -33,3 +36,70 @@ func TestClientConfigComplete(t *testing.T) {
 	require.Equal(true, lo.FromPtr(c.Transport.TLS.DisableCustomTLSFirstByte))
 	require.NotEmpty(c.NatHoleSTUNServer)
 }
+
+func TestAuthClientConfig_Complete(t *testing.T) {
+	// Create a temporary file for testing
+	tmpDir := t.TempDir()
+	testFile := filepath.Join(tmpDir, "test_token")
+	testContent := "client-token-value"
+	err := os.WriteFile(testFile, []byte(testContent), 0o600)
+	require.NoError(t, err)
+
+	tests := []struct {
+		name        string
+		config      AuthClientConfig
+		expectToken string
+		expectPanic bool
+	}{
+		{
+			name: "tokenSource resolved to token",
+			config: AuthClientConfig{
+				Method: AuthMethodToken,
+				TokenSource: &ValueSource{
+					Type: "file",
+					File: &FileSource{
+						Path: testFile,
+					},
+				},
+			},
+			expectToken: testContent,
+			expectPanic: false,
+		},
+		{
+			name: "direct token unchanged",
+			config: AuthClientConfig{
+				Method: AuthMethodToken,
+				Token:  "direct-token",
+			},
+			expectToken: "direct-token",
+			expectPanic: false,
+		},
+		{
+			name: "invalid tokenSource should panic",
+			config: AuthClientConfig{
+				Method: AuthMethodToken,
+				TokenSource: &ValueSource{
+					Type: "file",
+					File: &FileSource{
+						Path: "/non/existent/file",
+					},
+				},
+			},
+			expectPanic: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.expectPanic {
+				err := tt.config.Complete()
+				require.Error(t, err)
+			} else {
+				err := tt.config.Complete()
+				require.NoError(t, err)
+				require.Equal(t, tt.expectToken, tt.config.Token)
+				require.Nil(t, tt.config.TokenSource, "TokenSource should be cleared after resolution")
+			}
+		})
+	}
+}