🔧 chore: implement JWT configuration with TTL and retention policy

- Add JWTConfig struct with TTL and SecretRetention fields
- Configure default values: TTL=1h, RetentionFactor=2.0, MaxRetention=72h, CleanupInterval=1h
- Add environment variable support (DLC_AUTH_JWT_*)
- Implement getter methods for JWT configuration
- Add comprehensive unit tests for default and custom values
- Update logging to include JWT configuration values
- Fix BDD step implementation issues (duplicate methods, unused imports)
- All BDD tests passing with new JWT configuration

Implements JWT secret retention policy as defined in ADR-0021
Closes #42
Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

pkg/config/config.go

@@ -69,8 +69,19 @@ type APIConfig struct {
 
 // AuthConfig holds authentication configuration
 type AuthConfig struct {
-	JWTSecret           string `mapstructure:"jwt_secret"`
-	AdminMasterPassword string `mapstructure:"admin_master_password"`
+	JWTSecret           string    `mapstructure:"jwt_secret"`
+	AdminMasterPassword string    `mapstructure:"admin_master_password"`
+	JWT                 JWTConfig `mapstructure:"jwt"`
+}
+
+// JWTConfig holds JWT-specific configuration
+type JWTConfig struct {
+	TTL             time.Duration `mapstructure:"ttl"`
+	SecretRetention struct {
+		RetentionFactor float64       `mapstructure:"retention_factor"`
+		MaxRetention    time.Duration `mapstructure:"max_retention"`
+		CleanupInterval time.Duration `mapstructure:"cleanup_interval"`
+	} `mapstructure:"secret_retention"`
 }
 
 // DatabaseConfig holds database configuration
@@ -140,6 +151,10 @@ func LoadConfig() (*Config, error) {
 	// Auth defaults
 	v.SetDefault("auth.jwt_secret", "default-secret-key-please-change-in-production")
 	v.SetDefault("auth.admin_master_password", "admin123")
+	v.SetDefault("auth.jwt.ttl", 1*time.Hour)
+	v.SetDefault("auth.jwt.secret_retention.retention_factor", 2.0)
+	v.SetDefault("auth.jwt.secret_retention.max_retention", 72*time.Hour)
+	v.SetDefault("auth.jwt.secret_retention.cleanup_interval", 1*time.Hour)
 
 	// Check for custom config file path via environment variable
 	if configFile := os.Getenv("DLC_CONFIG_FILE"); configFile != "" {
@@ -182,6 +197,10 @@ func LoadConfig() (*Config, error) {
 	// Auth environment variables
 	v.BindEnv("auth.jwt_secret", "DLC_AUTH_JWT_SECRET")
 	v.BindEnv("auth.admin_master_password", "DLC_AUTH_ADMIN_MASTER_PASSWORD")
+	v.BindEnv("auth.jwt.ttl", "DLC_AUTH_JWT_TTL")
+	v.BindEnv("auth.jwt.secret_retention.retention_factor", "DLC_AUTH_JWT_SECRET_RETENTION_FACTOR")
+	v.BindEnv("auth.jwt.secret_retention.max_retention", "DLC_AUTH_JWT_SECRET_MAX_RETENTION")
+	v.BindEnv("auth.jwt.secret_retention.cleanup_interval", "DLC_AUTH_JWT_SECRET_CLEANUP_INTERVAL")
 	v.BindEnv("telemetry.sampler.type", "DLC_TELEMETRY_SAMPLER_TYPE")
 	v.BindEnv("telemetry.sampler.ratio", "DLC_TELEMETRY_SAMPLER_RATIO")
 
@@ -224,6 +243,10 @@ func LoadConfig() (*Config, error) {
 		Bool("telemetry_enabled", config.Telemetry.Enabled).
 		Str("telemetry_service", config.Telemetry.ServiceName).
 		Bool("api_v2_enabled", config.API.V2Enabled).
+		Dur("jwt_ttl", config.GetJWTTTL()).
+		Float64("jwt_retention_factor", config.GetJWTSecretRetentionFactor()).
+		Dur("jwt_max_retention", config.GetJWTSecretMaxRetention()).
+		Dur("jwt_cleanup_interval", config.GetJWTSecretCleanupInterval()).
 		Msg("Configuration loaded")
 
 	return &config, nil
@@ -284,6 +307,38 @@ func (c *Config) GetAdminMasterPassword() string {
 	return c.Auth.AdminMasterPassword
 }
 
+// GetJWTTTL returns the JWT TTL
+func (c *Config) GetJWTTTL() time.Duration {
+	if c.Auth.JWT.TTL == 0 {
+		return 1 * time.Hour // Default value
+	}
+	return c.Auth.JWT.TTL
+}
+
+// GetJWTSecretRetentionFactor returns the JWT secret retention factor
+func (c *Config) GetJWTSecretRetentionFactor() float64 {
+	if c.Auth.JWT.SecretRetention.RetentionFactor == 0 {
+		return 2.0 // Default value
+	}
+	return c.Auth.JWT.SecretRetention.RetentionFactor
+}
+
+// GetJWTSecretMaxRetention returns the maximum JWT secret retention period
+func (c *Config) GetJWTSecretMaxRetention() time.Duration {
+	if c.Auth.JWT.SecretRetention.MaxRetention == 0 {
+		return 72 * time.Hour // Default value
+	}
+	return c.Auth.JWT.SecretRetention.MaxRetention
+}
+
+// GetJWTSecretCleanupInterval returns the JWT secret cleanup interval
+func (c *Config) GetJWTSecretCleanupInterval() time.Duration {
+	if c.Auth.JWT.SecretRetention.CleanupInterval == 0 {
+		return 1 * time.Hour // Default value
+	}
+	return c.Auth.JWT.SecretRetention.CleanupInterval
+}
+
 // GetLoggingJSON returns whether JSON logging is enabled
 func (c *Config) GetLoggingJSON() bool {
 	return c.Logging.JSON

pkg/config/config_test.go

@@ -0,0 +1,67 @@
+package config
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestJWTConfigurationDefaults(t *testing.T) {
+	// Test that JWT configuration has proper defaults
+	config, err := LoadConfig()
+	assert.NoError(t, err)
+	assert.NotNil(t, config)
+
+	// Test JWT TTL default
+	expectedTTL := 1 * time.Hour
+	actualTTL := config.GetJWTTTL()
+	assert.Equal(t, expectedTTL, actualTTL, "JWT TTL should default to 1 hour")
+
+	// Test JWT retention factor default
+	expectedFactor := 2.0
+	actualFactor := config.GetJWTSecretRetentionFactor()
+	assert.Equal(t, expectedFactor, actualFactor, "JWT retention factor should default to 2.0")
+
+	// Test JWT max retention default
+	expectedMaxRetention := 72 * time.Hour
+	actualMaxRetention := config.GetJWTSecretMaxRetention()
+	assert.Equal(t, expectedMaxRetention, actualMaxRetention, "JWT max retention should default to 72 hours")
+
+	// Test JWT cleanup interval default
+	expectedCleanupInterval := 1 * time.Hour
+	actualCleanupInterval := config.GetJWTSecretCleanupInterval()
+	assert.Equal(t, expectedCleanupInterval, actualCleanupInterval, "JWT cleanup interval should default to 1 hour")
+}
+
+func TestJWTConfigurationCustomValues(t *testing.T) {
+	// Set custom environment variables
+	t.Setenv("DLC_AUTH_JWT_TTL", "2h")
+	t.Setenv("DLC_AUTH_JWT_SECRET_RETENTION_FACTOR", "3.5")
+	t.Setenv("DLC_AUTH_JWT_SECRET_MAX_RETENTION", "120h")
+	t.Setenv("DLC_AUTH_JWT_SECRET_CLEANUP_INTERVAL", "30m")
+
+	config, err := LoadConfig()
+	assert.NoError(t, err)
+	assert.NotNil(t, config)
+
+	// Test custom JWT TTL
+	expectedTTL := 2 * time.Hour
+	actualTTL := config.GetJWTTTL()
+	assert.Equal(t, expectedTTL, actualTTL, "JWT TTL should be 2 hours from environment variable")
+
+	// Test custom JWT retention factor
+	expectedFactor := 3.5
+	actualFactor := config.GetJWTSecretRetentionFactor()
+	assert.Equal(t, expectedFactor, actualFactor, "JWT retention factor should be 3.5 from environment variable")
+
+	// Test custom JWT max retention
+	expectedMaxRetention := 120 * time.Hour
+	actualMaxRetention := config.GetJWTSecretMaxRetention()
+	assert.Equal(t, expectedMaxRetention, actualMaxRetention, "JWT max retention should be 120 hours from environment variable")
+
+	// Test custom JWT cleanup interval
+	expectedCleanupInterval := 30 * time.Minute
+	actualCleanupInterval := config.GetJWTSecretCleanupInterval()
+	assert.Equal(t, expectedCleanupInterval, actualCleanupInterval, "JWT cleanup interval should be 30 minutes from environment variable")
+}