[FEATURE] Redis DB Index Selection (#653)

* [FEATURE] Redis DB Number Selection
- Allow users to specify the DB number
- This is so users who use their redis for multiple purposes can have clear demarcation between their data

* revert: import order

* Add default/example to config template with docs

* Set DB Index property name to be more clear

config.template.yml

@@ -223,6 +223,8 @@ session:
     port: 6379
     # This secret can also be set using the env variables AUTHELIA_SESSION_REDIS_PASSWORD
     password: authelia
+    # This is the Redis DB Index https://redis.io/commands/select (sometimes referred to as database number, DB, etc).
+    database_index: 0
 
 # Configuration of the authentication regulation mechanism.
 #

internal/configuration/schema/session.go

@@ -5,6 +5,7 @@ type RedisSessionConfiguration struct {
 	Host          string `mapstructure:"host"`
 	Port          int64  `mapstructure:"port"`
 	Password      string `mapstructure:"password"`
+	DatabaseIndex int    `mapstructure:"database_index"`
 }
 
 // SessionConfiguration represents the configuration related to user sessions.

internal/session/provider_config.go

@@ -46,6 +46,8 @@ func NewProviderConfig(configuration schema.SessionConfiguration) ProviderConfig
 			Host:     configuration.Redis.Host,
 			Port:     configuration.Redis.Port,
 			Password: configuration.Redis.Password,
+			// DbNumber is the fasthttp/session property for the Redis DB Index
+			DbNumber:    configuration.Redis.DatabaseIndex,
 			PoolSize:    8,
 			IdleTimeout: 300,
 			KeyPrefix:   "authelia-session",

internal/session/provider_config_test.go

@@ -54,4 +54,25 @@ func TestShouldCreateRedisSessionProvider(t *testing.T) {
 	assert.Equal(t, "redis.example.com", pConfig.Host)
 	assert.Equal(t, int64(6379), pConfig.Port)
 	assert.Equal(t, "pass", pConfig.Password)
+	// DbNumber is the fasthttp/session property for the Redis DB Index
+	assert.Equal(t, 0, pConfig.DbNumber)
+}
+
+func TestShouldSetDbNumber(t *testing.T) {
+	configuration := schema.SessionConfiguration{}
+	configuration.Domain = "example.com"
+	configuration.Name = "my_session"
+	configuration.Expiration = 40
+	configuration.Redis = &schema.RedisSessionConfiguration{
+		Host:          "redis.example.com",
+		Port:          6379,
+		Password:      "pass",
+		DatabaseIndex: 5,
+	}
+	providerConfig := NewProviderConfig(configuration)
+	assert.Equal(t, "redis", providerConfig.providerName)
+	assert.IsType(t, &redis.Config{}, providerConfig.providerConfig)
+	pConfig := providerConfig.providerConfig.(*redis.Config)
+	// DbNumber is the fasthttp/session property for the Redis DB Index
+	assert.Equal(t, 5, pConfig.DbNumber)
 }