// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package notify

import (
	"context"
	"crypto/tls"
	"crypto/x509"
	"errors"
	"net/http"
	"strconv"
	"strings"
	"time"

	"github.com/minio/minio/internal/config"
	"github.com/minio/minio/internal/event"
	"github.com/minio/minio/internal/event/target"
	"github.com/minio/minio/internal/logger"
	xnet "github.com/minio/minio/internal/net"
	"github.com/minio/pkg/env"
)

const (
	formatNamespace = "namespace"
)

// ErrTargetsOffline - Indicates single/multiple target failures.
var ErrTargetsOffline = errors.New("one or more targets are offline. Please use `mc admin info --json` to check the offline targets")

// TestNotificationTargets is similar to GetNotificationTargets()
// avoids explicit registration.
func TestNotificationTargets(ctx context.Context, cfg config.Config, transport *http.Transport, targetIDs []event.TargetID) error {
	test := true
	returnOnTargetError := true
	targets, err := RegisterNotificationTargets(ctx, cfg, transport, targetIDs, test, returnOnTargetError)
	if err == nil {
		// Close all targets since we are only testing connections.
		for _, t := range targets.TargetMap() {
			_ = t.Close()
		}
	}

	return err
}

// GetNotificationTargets registers and initializes all notification
// targets, returns error if any.
func GetNotificationTargets(ctx context.Context, cfg config.Config, transport *http.Transport, test bool) (*event.TargetList, error) {
	returnOnTargetError := false
	return RegisterNotificationTargets(ctx, cfg, transport, nil, test, returnOnTargetError)
}

// RegisterNotificationTargets - returns TargetList which contains enabled targets in serverConfig.
// A new notification target is added like below
// * Add a new target in pkg/event/target package.
// * Add newly added target configuration to serverConfig.Notify.<TARGET_NAME>.
// * Handle the configuration in this function to create/add into TargetList.
func RegisterNotificationTargets(ctx context.Context, cfg config.Config, transport *http.Transport, targetIDs []event.TargetID, test bool, returnOnTargetError bool) (*event.TargetList, error) {
	targetList, err := FetchRegisteredTargets(ctx, cfg, transport, test, returnOnTargetError)
	if err != nil {
		return targetList, err
	}

	if test {
		// Verify if user is trying to disable already configured
		// notification targets, based on their target IDs
		for _, targetID := range targetIDs {
			if !targetList.Exists(targetID) {
				return nil, config.Errorf(
					"Unable to disable configured targets '%v'",
					targetID)
			}
		}
	}

	return targetList, nil
}

// FetchRegisteredTargets - Returns a set of configured TargetList
// If `returnOnTargetError` is set to true, The function returns when a target initialization fails
// Else, the function will return a complete TargetList irrespective of errors
func FetchRegisteredTargets(ctx context.Context, cfg config.Config, transport *http.Transport, test bool, returnOnTargetError bool) (_ *event.TargetList, err error) {
	targetList := event.NewTargetList()
	var targetsOffline bool

	defer func() {
		// Automatically close all connections to targets when an error occur.
		// Close all the targets if returnOnTargetError is set
		// Else, close only the failed targets
		if err != nil && returnOnTargetError {
			for _, t := range targetList.TargetMap() {
				_ = t.Close()
			}
		}
	}()

	if err = checkValidNotificationKeys(cfg); err != nil {
		return nil, err
	}

	amqpTargets, err := GetNotifyAMQP(cfg[config.NotifyAMQPSubSys])
	if err != nil {
		return nil, err
	}

	esTargets, err := GetNotifyES(cfg[config.NotifyESSubSys], transport)
	if err != nil {
		return nil, err
	}

	kafkaTargets, err := GetNotifyKafka(cfg[config.NotifyKafkaSubSys])
	if err != nil {
		return nil, err
	}

	mqttTargets, err := GetNotifyMQTT(cfg[config.NotifyMQTTSubSys], transport.TLSClientConfig.RootCAs)
	if err != nil {
		return nil, err
	}

	mysqlTargets, err := GetNotifyMySQL(cfg[config.NotifyMySQLSubSys])
	if err != nil {
		return nil, err
	}

	natsTargets, err := GetNotifyNATS(cfg[config.NotifyNATSSubSys], transport.TLSClientConfig.RootCAs)
	if err != nil {
		return nil, err
	}

	nsqTargets, err := GetNotifyNSQ(cfg[config.NotifyNSQSubSys])
	if err != nil {
		return nil, err
	}

	postgresTargets, err := GetNotifyPostgres(cfg[config.NotifyPostgresSubSys])
	if err != nil {
		return nil, err
	}

	redisTargets, err := GetNotifyRedis(cfg[config.NotifyRedisSubSys])
	if err != nil {
		return nil, err
	}

	webhookTargets, err := GetNotifyWebhook(cfg[config.NotifyWebhookSubSys], transport)
	if err != nil {
		return nil, err
	}

	for id, args := range amqpTargets {
		if !args.Enable {
			continue
		}
		newTarget, err := target.NewAMQPTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
		if err != nil {
			targetsOffline = true
			if returnOnTargetError {
				return nil, err
			}
			_ = newTarget.Close()
		}

		if err = targetList.Add(newTarget); err != nil {
			logger.LogIf(context.Background(), err)
			if returnOnTargetError {
				return nil, err
			}
		}
	}

	for id, args := range esTargets {
		if !args.Enable {
			continue
		}
		newTarget, err := target.NewElasticsearchTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
		if err != nil {
			targetsOffline = true
			if returnOnTargetError {
				return nil, err
			}
			_ = newTarget.Close()
		}
		if err = targetList.Add(newTarget); err != nil {
			logger.LogIf(context.Background(), err)
			if returnOnTargetError {
				return nil, err
			}
		}
	}

	for id, args := range kafkaTargets {
		if !args.Enable {
			continue
		}
		args.TLS.RootCAs = transport.TLSClientConfig.RootCAs
		newTarget, err := target.NewKafkaTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
		if err != nil {
			targetsOffline = true
			if returnOnTargetError {
				return nil, err
			}
			_ = newTarget.Close()
		}
		if err = targetList.Add(newTarget); err != nil {
			logger.LogIf(context.Background(), err)
			if returnOnTargetError {
				return nil, err
			}
		}
	}

	for id, args := range mqttTargets {
		if !args.Enable {
			continue
		}
		args.RootCAs = transport.TLSClientConfig.RootCAs
		newTarget, err := target.NewMQTTTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
		if err != nil {
			targetsOffline = true
			if returnOnTargetError {
				return nil, err
			}
			_ = newTarget.Close()
		}
		if err = targetList.Add(newTarget); err != nil {
			logger.LogIf(context.Background(), err)
			if returnOnTargetError {
				return nil, err
			}
		}
	}

	for id, args := range mysqlTargets {
		if !args.Enable {
			continue
		}
		newTarget, err := target.NewMySQLTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
		if err != nil {
			targetsOffline = true
			if returnOnTargetError {
				return nil, err
			}
			_ = newTarget.Close()
		}
		if err = targetList.Add(newTarget); err != nil {
			logger.LogIf(context.Background(), err)
			if returnOnTargetError {
				return nil, err
			}
		}
	}

	for id, args := range natsTargets {
		if !args.Enable {
			continue
		}
		newTarget, err := target.NewNATSTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
		if err != nil {
			targetsOffline = true
			if returnOnTargetError {
				return nil, err
			}
			_ = newTarget.Close()
		}
		if err = targetList.Add(newTarget); err != nil {
			logger.LogIf(context.Background(), err)
			if returnOnTargetError {
				return nil, err
			}
		}
	}

	for id, args := range nsqTargets {
		if !args.Enable {
			continue
		}
		newTarget, err := target.NewNSQTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
		if err != nil {
			targetsOffline = true
			if returnOnTargetError {
				return nil, err
			}
			_ = newTarget.Close()
		}
		if err = targetList.Add(newTarget); err != nil {
			logger.LogIf(context.Background(), err)
			if returnOnTargetError {
				return nil, err
			}
		}
	}

	for id, args := range postgresTargets {
		if !args.Enable {
			continue
		}
		newTarget, err := target.NewPostgreSQLTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
		if err != nil {
			targetsOffline = true
			if returnOnTargetError {
				return nil, err
			}
			_ = newTarget.Close()
		}
		if err = targetList.Add(newTarget); err != nil {
			logger.LogIf(context.Background(), err)
			if returnOnTargetError {
				return nil, err
			}
		}
	}

	for id, args := range redisTargets {
		if !args.Enable {
			continue
		}
		newTarget, err := target.NewRedisTarget(id, args, ctx.Done(), logger.LogOnceIf, test)
		if err != nil {
			targetsOffline = true
			if returnOnTargetError {
				return nil, err
			}
			_ = newTarget.Close()
		}
		if err = targetList.Add(newTarget); err != nil {
			logger.LogIf(context.Background(), err)
			if returnOnTargetError {
				return nil, err
			}
		}
	}

	for id, args := range webhookTargets {
		if !args.Enable {
			continue
		}
		newTarget, err := target.NewWebhookTarget(ctx, id, args, logger.LogOnceIf, transport, test)
		if err != nil {
			targetsOffline = true
			if returnOnTargetError {
				return nil, err
			}
			_ = newTarget.Close()
		}
		if err = targetList.Add(newTarget); err != nil {
			logger.LogIf(context.Background(), err)
			if returnOnTargetError {
				return nil, err
			}
		}
	}

	if targetsOffline {
		return targetList, ErrTargetsOffline
	}

	return targetList, nil
}

// DefaultNotificationKVS - default notification list of kvs.
var (
	DefaultNotificationKVS = map[string]config.KVS{
		config.NotifyAMQPSubSys:     DefaultAMQPKVS,
		config.NotifyKafkaSubSys:    DefaultKafkaKVS,
		config.NotifyMQTTSubSys:     DefaultMQTTKVS,
		config.NotifyMySQLSubSys:    DefaultMySQLKVS,
		config.NotifyNATSSubSys:     DefaultNATSKVS,
		config.NotifyNSQSubSys:      DefaultNSQKVS,
		config.NotifyPostgresSubSys: DefaultPostgresKVS,
		config.NotifyRedisSubSys:    DefaultRedisKVS,
		config.NotifyWebhookSubSys:  DefaultWebhookKVS,
		config.NotifyESSubSys:       DefaultESKVS,
	}
)

func checkValidNotificationKeys(cfg config.Config) error {
	for subSys, tgt := range cfg {
		validKVS, ok := DefaultNotificationKVS[subSys]
		if !ok {
			continue
		}
		for tname, kv := range tgt {
			subSysTarget := subSys
			if tname != config.Default {
				subSysTarget = subSys + config.SubSystemSeparator + tname
			}
			if v, ok := kv.Lookup(config.Enable); ok && v == config.EnableOn {
				if err := config.CheckValidKeys(subSysTarget, kv, validKVS); err != nil {
					return err
				}
			}
		}
	}
	return nil
}

func mergeTargets(cfgTargets map[string]config.KVS, envname string, defaultKVS config.KVS) map[string]config.KVS {
	newCfgTargets := make(map[string]config.KVS)
	for _, e := range env.List(envname) {
		tgt := strings.TrimPrefix(e, envname+config.Default)
		if tgt == envname {
			tgt = config.Default
		}
		newCfgTargets[tgt] = defaultKVS
	}
	for tgt, kv := range cfgTargets {
		newCfgTargets[tgt] = kv
	}
	return newCfgTargets
}

// DefaultKakfaKVS - default KV for kafka target
var (
	DefaultKafkaKVS = config.KVS{
		config.KV{
			Key:   config.Enable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.KafkaTopic,
			Value: "",
		},
		config.KV{
			Key:   target.KafkaBrokers,
			Value: "",
		},
		config.KV{
			Key:   target.KafkaSASLUsername,
			Value: "",
		},
		config.KV{
			Key:   target.KafkaSASLPassword,
			Value: "",
		},
		config.KV{
			Key:   target.KafkaSASLMechanism,
			Value: "plain",
		},
		config.KV{
			Key:   target.KafkaClientTLSCert,
			Value: "",
		},
		config.KV{
			Key:   target.KafkaClientTLSKey,
			Value: "",
		},
		config.KV{
			Key:   target.KafkaTLSClientAuth,
			Value: "0",
		},
		config.KV{
			Key:   target.KafkaSASL,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.KafkaTLS,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.KafkaTLSSkipVerify,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.KafkaQueueLimit,
			Value: "0",
		},
		config.KV{
			Key:   target.KafkaQueueDir,
			Value: "",
		},
		config.KV{
			Key:   target.KafkaVersion,
			Value: "",
		},
	}
)

// GetNotifyKafka - returns a map of registered notification 'kafka' targets
func GetNotifyKafka(kafkaKVS map[string]config.KVS) (map[string]target.KafkaArgs, error) {
	kafkaTargets := make(map[string]target.KafkaArgs)
	for k, kv := range mergeTargets(kafkaKVS, target.EnvKafkaEnable, DefaultKafkaKVS) {
		enableEnv := target.EnvKafkaEnable
		if k != config.Default {
			enableEnv = enableEnv + config.Default + k
		}
		enabled, err := config.ParseBool(env.Get(enableEnv, kv.Get(config.Enable)))
		if err != nil {
			return nil, err
		}
		if !enabled {
			continue
		}
		var brokers []xnet.Host
		brokersEnv := target.EnvKafkaBrokers
		if k != config.Default {
			brokersEnv = brokersEnv + config.Default + k
		}
		kafkaBrokers := env.Get(brokersEnv, kv.Get(target.KafkaBrokers))
		if len(kafkaBrokers) == 0 {
			return nil, config.Errorf("kafka 'brokers' cannot be empty")
		}
		for _, s := range strings.Split(kafkaBrokers, config.ValueSeparator) {
			var host *xnet.Host
			host, err = xnet.ParseHost(s)
			if err != nil {
				break
			}
			brokers = append(brokers, *host)
		}
		if err != nil {
			return nil, err
		}

		queueLimitEnv := target.EnvKafkaQueueLimit
		if k != config.Default {
			queueLimitEnv = queueLimitEnv + config.Default + k
		}
		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.KafkaQueueLimit)), 10, 64)
		if err != nil {
			return nil, err
		}

		clientAuthEnv := target.EnvKafkaTLSClientAuth
		if k != config.Default {
			clientAuthEnv = clientAuthEnv + config.Default + k
		}
		clientAuth, err := strconv.Atoi(env.Get(clientAuthEnv, kv.Get(target.KafkaTLSClientAuth)))
		if err != nil {
			return nil, err
		}

		topicEnv := target.EnvKafkaTopic
		if k != config.Default {
			topicEnv = topicEnv + config.Default + k
		}

		queueDirEnv := target.EnvKafkaQueueDir
		if k != config.Default {
			queueDirEnv = queueDirEnv + config.Default + k
		}

		versionEnv := target.EnvKafkaVersion
		if k != config.Default {
			versionEnv = versionEnv + config.Default + k
		}

		kafkaArgs := target.KafkaArgs{
			Enable:     enabled,
			Brokers:    brokers,
			Topic:      env.Get(topicEnv, kv.Get(target.KafkaTopic)),
			QueueDir:   env.Get(queueDirEnv, kv.Get(target.KafkaQueueDir)),
			QueueLimit: queueLimit,
			Version:    env.Get(versionEnv, kv.Get(target.KafkaVersion)),
		}

		tlsEnableEnv := target.EnvKafkaTLS
		if k != config.Default {
			tlsEnableEnv = tlsEnableEnv + config.Default + k
		}
		tlsSkipVerifyEnv := target.EnvKafkaTLSSkipVerify
		if k != config.Default {
			tlsSkipVerifyEnv = tlsSkipVerifyEnv + config.Default + k
		}

		tlsClientTLSCertEnv := target.EnvKafkaClientTLSCert
		if k != config.Default {
			tlsClientTLSCertEnv = tlsClientTLSCertEnv + config.Default + k
		}

		tlsClientTLSKeyEnv := target.EnvKafkaClientTLSKey
		if k != config.Default {
			tlsClientTLSKeyEnv = tlsClientTLSKeyEnv + config.Default + k
		}

		kafkaArgs.TLS.Enable = env.Get(tlsEnableEnv, kv.Get(target.KafkaTLS)) == config.EnableOn
		kafkaArgs.TLS.SkipVerify = env.Get(tlsSkipVerifyEnv, kv.Get(target.KafkaTLSSkipVerify)) == config.EnableOn
		kafkaArgs.TLS.ClientAuth = tls.ClientAuthType(clientAuth)

		kafkaArgs.TLS.ClientTLSCert = env.Get(tlsClientTLSCertEnv, kv.Get(target.KafkaClientTLSCert))
		kafkaArgs.TLS.ClientTLSKey = env.Get(tlsClientTLSKeyEnv, kv.Get(target.KafkaClientTLSKey))

		saslEnableEnv := target.EnvKafkaSASLEnable
		if k != config.Default {
			saslEnableEnv = saslEnableEnv + config.Default + k
		}
		saslUsernameEnv := target.EnvKafkaSASLUsername
		if k != config.Default {
			saslUsernameEnv = saslUsernameEnv + config.Default + k
		}
		saslPasswordEnv := target.EnvKafkaSASLPassword
		if k != config.Default {
			saslPasswordEnv = saslPasswordEnv + config.Default + k
		}
		saslMechanismEnv := target.EnvKafkaSASLMechanism
		if k != config.Default {
			saslMechanismEnv = saslMechanismEnv + config.Default + k
		}
		kafkaArgs.SASL.Enable = env.Get(saslEnableEnv, kv.Get(target.KafkaSASL)) == config.EnableOn
		kafkaArgs.SASL.User = env.Get(saslUsernameEnv, kv.Get(target.KafkaSASLUsername))
		kafkaArgs.SASL.Password = env.Get(saslPasswordEnv, kv.Get(target.KafkaSASLPassword))
		kafkaArgs.SASL.Mechanism = env.Get(saslMechanismEnv, kv.Get(target.KafkaSASLMechanism))

		if err = kafkaArgs.Validate(); err != nil {
			return nil, err
		}

		kafkaTargets[k] = kafkaArgs
	}

	return kafkaTargets, nil
}

// DefaultMQTTKVS - default MQTT config
var (
	DefaultMQTTKVS = config.KVS{
		config.KV{
			Key:   config.Enable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.MqttBroker,
			Value: "",
		},
		config.KV{
			Key:   target.MqttTopic,
			Value: "",
		},
		config.KV{
			Key:   target.MqttPassword,
			Value: "",
		},
		config.KV{
			Key:   target.MqttUsername,
			Value: "",
		},
		config.KV{
			Key:   target.MqttQoS,
			Value: "0",
		},
		config.KV{
			Key:   target.MqttKeepAliveInterval,
			Value: "0s",
		},
		config.KV{
			Key:   target.MqttReconnectInterval,
			Value: "0s",
		},
		config.KV{
			Key:   target.MqttQueueDir,
			Value: "",
		},
		config.KV{
			Key:   target.MqttQueueLimit,
			Value: "0",
		},
	}
)

// GetNotifyMQTT - returns a map of registered notification 'mqtt' targets
func GetNotifyMQTT(mqttKVS map[string]config.KVS, rootCAs *x509.CertPool) (map[string]target.MQTTArgs, error) {
	mqttTargets := make(map[string]target.MQTTArgs)
	for k, kv := range mergeTargets(mqttKVS, target.EnvMQTTEnable, DefaultMQTTKVS) {
		enableEnv := target.EnvMQTTEnable
		if k != config.Default {
			enableEnv = enableEnv + config.Default + k
		}

		enabled, err := config.ParseBool(env.Get(enableEnv, kv.Get(config.Enable)))
		if err != nil {
			return nil, err
		}
		if !enabled {
			continue
		}

		brokerEnv := target.EnvMQTTBroker
		if k != config.Default {
			brokerEnv = brokerEnv + config.Default + k
		}

		brokerURL, err := xnet.ParseURL(env.Get(brokerEnv, kv.Get(target.MqttBroker)))
		if err != nil {
			return nil, err
		}

		reconnectIntervalEnv := target.EnvMQTTReconnectInterval
		if k != config.Default {
			reconnectIntervalEnv = reconnectIntervalEnv + config.Default + k
		}
		reconnectInterval, err := time.ParseDuration(env.Get(reconnectIntervalEnv,
			kv.Get(target.MqttReconnectInterval)))
		if err != nil {
			return nil, err
		}

		keepAliveIntervalEnv := target.EnvMQTTKeepAliveInterval
		if k != config.Default {
			keepAliveIntervalEnv = keepAliveIntervalEnv + config.Default + k
		}
		keepAliveInterval, err := time.ParseDuration(env.Get(keepAliveIntervalEnv,
			kv.Get(target.MqttKeepAliveInterval)))
		if err != nil {
			return nil, err
		}

		queueLimitEnv := target.EnvMQTTQueueLimit
		if k != config.Default {
			queueLimitEnv = queueLimitEnv + config.Default + k
		}
		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.MqttQueueLimit)), 10, 64)
		if err != nil {
			return nil, err
		}

		qosEnv := target.EnvMQTTQoS
		if k != config.Default {
			qosEnv = qosEnv + config.Default + k
		}

		// Parse uint8 value
		qos, err := strconv.ParseUint(env.Get(qosEnv, kv.Get(target.MqttQoS)), 10, 8)
		if err != nil {
			return nil, err
		}

		topicEnv := target.EnvMQTTTopic
		if k != config.Default {
			topicEnv = topicEnv + config.Default + k
		}

		usernameEnv := target.EnvMQTTUsername
		if k != config.Default {
			usernameEnv = usernameEnv + config.Default + k
		}

		passwordEnv := target.EnvMQTTPassword
		if k != config.Default {
			passwordEnv = passwordEnv + config.Default + k
		}

		queueDirEnv := target.EnvMQTTQueueDir
		if k != config.Default {
			queueDirEnv = queueDirEnv + config.Default + k
		}

		mqttArgs := target.MQTTArgs{
			Enable:               enabled,
			Broker:               *brokerURL,
			Topic:                env.Get(topicEnv, kv.Get(target.MqttTopic)),
			QoS:                  byte(qos),
			User:                 env.Get(usernameEnv, kv.Get(target.MqttUsername)),
			Password:             env.Get(passwordEnv, kv.Get(target.MqttPassword)),
			MaxReconnectInterval: reconnectInterval,
			KeepAlive:            keepAliveInterval,
			RootCAs:              rootCAs,
			QueueDir:             env.Get(queueDirEnv, kv.Get(target.MqttQueueDir)),
			QueueLimit:           queueLimit,
		}

		if err = mqttArgs.Validate(); err != nil {
			return nil, err
		}
		mqttTargets[k] = mqttArgs
	}
	return mqttTargets, nil
}

// DefaultMySQLKVS - default KV for MySQL
var (
	DefaultMySQLKVS = config.KVS{
		config.KV{
			Key:   config.Enable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.MySQLFormat,
			Value: formatNamespace,
		},
		config.KV{
			Key:   target.MySQLDSNString,
			Value: "",
		},
		config.KV{
			Key:   target.MySQLTable,
			Value: "",
		},
		config.KV{
			Key:   target.MySQLQueueDir,
			Value: "",
		},
		config.KV{
			Key:   target.MySQLQueueLimit,
			Value: "0",
		},
		config.KV{
			Key:   target.MySQLMaxOpenConnections,
			Value: "2",
		},
	}
)

// GetNotifyMySQL - returns a map of registered notification 'mysql' targets
func GetNotifyMySQL(mysqlKVS map[string]config.KVS) (map[string]target.MySQLArgs, error) {
	mysqlTargets := make(map[string]target.MySQLArgs)
	for k, kv := range mergeTargets(mysqlKVS, target.EnvMySQLEnable, DefaultMySQLKVS) {
		enableEnv := target.EnvMySQLEnable
		if k != config.Default {
			enableEnv = enableEnv + config.Default + k
		}

		enabled, err := config.ParseBool(env.Get(enableEnv, kv.Get(config.Enable)))
		if err != nil {
			return nil, err
		}
		if !enabled {
			continue
		}

		queueLimitEnv := target.EnvMySQLQueueLimit
		if k != config.Default {
			queueLimitEnv = queueLimitEnv + config.Default + k
		}
		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.MySQLQueueLimit)), 10, 64)
		if err != nil {
			return nil, err
		}

		formatEnv := target.EnvMySQLFormat
		if k != config.Default {
			formatEnv = formatEnv + config.Default + k
		}

		dsnStringEnv := target.EnvMySQLDSNString
		if k != config.Default {
			dsnStringEnv = dsnStringEnv + config.Default + k
		}

		tableEnv := target.EnvMySQLTable
		if k != config.Default {
			tableEnv = tableEnv + config.Default + k
		}

		queueDirEnv := target.EnvMySQLQueueDir
		if k != config.Default {
			queueDirEnv = queueDirEnv + config.Default + k
		}

		maxOpenConnectionsEnv := target.EnvMySQLMaxOpenConnections
		if k != config.Default {
			maxOpenConnectionsEnv = maxOpenConnectionsEnv + config.Default + k
		}

		maxOpenConnections, cErr := strconv.Atoi(env.Get(maxOpenConnectionsEnv, kv.Get(target.MySQLMaxOpenConnections)))
		if cErr != nil {
			return nil, cErr
		}

		mysqlArgs := target.MySQLArgs{
			Enable:             enabled,
			Format:             env.Get(formatEnv, kv.Get(target.MySQLFormat)),
			DSN:                env.Get(dsnStringEnv, kv.Get(target.MySQLDSNString)),
			Table:              env.Get(tableEnv, kv.Get(target.MySQLTable)),
			QueueDir:           env.Get(queueDirEnv, kv.Get(target.MySQLQueueDir)),
			QueueLimit:         queueLimit,
			MaxOpenConnections: maxOpenConnections,
		}
		if err = mysqlArgs.Validate(); err != nil {
			return nil, err
		}
		mysqlTargets[k] = mysqlArgs
	}
	return mysqlTargets, nil
}

// DefaultNATSKVS - NATS KV for nats config.
var (
	DefaultNATSKVS = config.KVS{
		config.KV{
			Key:   config.Enable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.NATSAddress,
			Value: "",
		},
		config.KV{
			Key:   target.NATSSubject,
			Value: "",
		},
		config.KV{
			Key:   target.NATSUsername,
			Value: "",
		},
		config.KV{
			Key:   target.NATSPassword,
			Value: "",
		},
		config.KV{
			Key:   target.NATSToken,
			Value: "",
		},
		config.KV{
			Key:   target.NATSTLS,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.NATSTLSSkipVerify,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.NATSCertAuthority,
			Value: "",
		},
		config.KV{
			Key:   target.NATSClientCert,
			Value: "",
		},
		config.KV{
			Key:   target.NATSClientKey,
			Value: "",
		},
		config.KV{
			Key:   target.NATSPingInterval,
			Value: "0",
		},
		config.KV{
			Key:   target.NATSStreaming,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.NATSStreamingAsync,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.NATSStreamingMaxPubAcksInFlight,
			Value: "0",
		},
		config.KV{
			Key:   target.NATSStreamingClusterID,
			Value: "",
		},
		config.KV{
			Key:   target.NATSQueueDir,
			Value: "",
		},
		config.KV{
			Key:   target.NATSQueueLimit,
			Value: "0",
		},
	}
)

// GetNotifyNATS - returns a map of registered notification 'nats' targets
func GetNotifyNATS(natsKVS map[string]config.KVS, rootCAs *x509.CertPool) (map[string]target.NATSArgs, error) {
	natsTargets := make(map[string]target.NATSArgs)
	for k, kv := range mergeTargets(natsKVS, target.EnvNATSEnable, DefaultNATSKVS) {
		enableEnv := target.EnvNATSEnable
		if k != config.Default {
			enableEnv = enableEnv + config.Default + k
		}

		enabled, err := config.ParseBool(env.Get(enableEnv, kv.Get(config.Enable)))
		if err != nil {
			return nil, err
		}
		if !enabled {
			continue
		}

		addressEnv := target.EnvNATSAddress
		if k != config.Default {
			addressEnv = addressEnv + config.Default + k
		}

		address, err := xnet.ParseHost(env.Get(addressEnv, kv.Get(target.NATSAddress)))
		if err != nil {
			return nil, err
		}

		pingIntervalEnv := target.EnvNATSPingInterval
		if k != config.Default {
			pingIntervalEnv = pingIntervalEnv + config.Default + k
		}

		pingInterval, err := strconv.ParseInt(env.Get(pingIntervalEnv, kv.Get(target.NATSPingInterval)), 10, 64)
		if err != nil {
			return nil, err
		}

		queueLimitEnv := target.EnvNATSQueueLimit
		if k != config.Default {
			queueLimitEnv = queueLimitEnv + config.Default + k
		}

		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.NATSQueueLimit)), 10, 64)
		if err != nil {
			return nil, err
		}

		tlsEnv := target.EnvNATSTLS
		if k != config.Default {
			tlsEnv = tlsEnv + config.Default + k
		}

		tlsSkipVerifyEnv := target.EnvNATSTLSSkipVerify
		if k != config.Default {
			tlsSkipVerifyEnv = tlsSkipVerifyEnv + config.Default + k
		}

		subjectEnv := target.EnvNATSSubject
		if k != config.Default {
			subjectEnv = subjectEnv + config.Default + k
		}

		usernameEnv := target.EnvNATSUsername
		if k != config.Default {
			usernameEnv = usernameEnv + config.Default + k
		}

		passwordEnv := target.EnvNATSPassword
		if k != config.Default {
			passwordEnv = passwordEnv + config.Default + k
		}

		tokenEnv := target.EnvNATSToken
		if k != config.Default {
			tokenEnv = tokenEnv + config.Default + k
		}

		queueDirEnv := target.EnvNATSQueueDir
		if k != config.Default {
			queueDirEnv = queueDirEnv + config.Default + k
		}

		certAuthorityEnv := target.EnvNATSCertAuthority
		if k != config.Default {
			certAuthorityEnv = certAuthorityEnv + config.Default + k
		}

		clientCertEnv := target.EnvNATSClientCert
		if k != config.Default {
			clientCertEnv = clientCertEnv + config.Default + k
		}

		clientKeyEnv := target.EnvNATSClientKey
		if k != config.Default {
			clientKeyEnv = clientKeyEnv + config.Default + k
		}

		natsArgs := target.NATSArgs{
			Enable:        true,
			Address:       *address,
			Subject:       env.Get(subjectEnv, kv.Get(target.NATSSubject)),
			Username:      env.Get(usernameEnv, kv.Get(target.NATSUsername)),
			Password:      env.Get(passwordEnv, kv.Get(target.NATSPassword)),
			CertAuthority: env.Get(certAuthorityEnv, kv.Get(target.NATSCertAuthority)),
			ClientCert:    env.Get(clientCertEnv, kv.Get(target.NATSClientCert)),
			ClientKey:     env.Get(clientKeyEnv, kv.Get(target.NATSClientKey)),
			Token:         env.Get(tokenEnv, kv.Get(target.NATSToken)),
			TLS:           env.Get(tlsEnv, kv.Get(target.NATSTLS)) == config.EnableOn,
			TLSSkipVerify: env.Get(tlsSkipVerifyEnv, kv.Get(target.NATSTLSSkipVerify)) == config.EnableOn,
			PingInterval:  pingInterval,
			QueueDir:      env.Get(queueDirEnv, kv.Get(target.NATSQueueDir)),
			QueueLimit:    queueLimit,
			RootCAs:       rootCAs,
		}

		streamingEnableEnv := target.EnvNATSStreaming
		if k != config.Default {
			streamingEnableEnv = streamingEnableEnv + config.Default + k
		}

		streamingEnabled := env.Get(streamingEnableEnv, kv.Get(target.NATSStreaming)) == config.EnableOn
		if streamingEnabled {
			asyncEnv := target.EnvNATSStreamingAsync
			if k != config.Default {
				asyncEnv = asyncEnv + config.Default + k
			}
			maxPubAcksInflightEnv := target.EnvNATSStreamingMaxPubAcksInFlight
			if k != config.Default {
				maxPubAcksInflightEnv = maxPubAcksInflightEnv + config.Default + k
			}
			maxPubAcksInflight, err := strconv.Atoi(env.Get(maxPubAcksInflightEnv,
				kv.Get(target.NATSStreamingMaxPubAcksInFlight)))
			if err != nil {
				return nil, err
			}
			clusterIDEnv := target.EnvNATSStreamingClusterID
			if k != config.Default {
				clusterIDEnv = clusterIDEnv + config.Default + k
			}
			natsArgs.Streaming.Enable = streamingEnabled
			natsArgs.Streaming.ClusterID = env.Get(clusterIDEnv, kv.Get(target.NATSStreamingClusterID))
			natsArgs.Streaming.Async = env.Get(asyncEnv, kv.Get(target.NATSStreamingAsync)) == config.EnableOn
			natsArgs.Streaming.MaxPubAcksInflight = maxPubAcksInflight
		}

		if err = natsArgs.Validate(); err != nil {
			return nil, err
		}

		natsTargets[k] = natsArgs
	}
	return natsTargets, nil
}

// DefaultNSQKVS - NSQ KV for config
var (
	DefaultNSQKVS = config.KVS{
		config.KV{
			Key:   config.Enable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.NSQAddress,
			Value: "",
		},
		config.KV{
			Key:   target.NSQTopic,
			Value: "",
		},
		config.KV{
			Key:   target.NSQTLS,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.NSQTLSSkipVerify,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.NSQQueueDir,
			Value: "",
		},
		config.KV{
			Key:   target.NSQQueueLimit,
			Value: "0",
		},
	}
)

// GetNotifyNSQ - returns a map of registered notification 'nsq' targets
func GetNotifyNSQ(nsqKVS map[string]config.KVS) (map[string]target.NSQArgs, error) {
	nsqTargets := make(map[string]target.NSQArgs)
	for k, kv := range mergeTargets(nsqKVS, target.EnvNSQEnable, DefaultNSQKVS) {
		enableEnv := target.EnvNSQEnable
		if k != config.Default {
			enableEnv = enableEnv + config.Default + k
		}

		enabled, err := config.ParseBool(env.Get(enableEnv, kv.Get(config.Enable)))
		if err != nil {
			return nil, err
		}
		if !enabled {
			continue
		}

		addressEnv := target.EnvNSQAddress
		if k != config.Default {
			addressEnv = addressEnv + config.Default + k
		}
		nsqdAddress, err := xnet.ParseHost(env.Get(addressEnv, kv.Get(target.NSQAddress)))
		if err != nil {
			return nil, err
		}
		tlsEnableEnv := target.EnvNSQTLS
		if k != config.Default {
			tlsEnableEnv = tlsEnableEnv + config.Default + k
		}
		tlsSkipVerifyEnv := target.EnvNSQTLSSkipVerify
		if k != config.Default {
			tlsSkipVerifyEnv = tlsSkipVerifyEnv + config.Default + k
		}

		queueLimitEnv := target.EnvNSQQueueLimit
		if k != config.Default {
			queueLimitEnv = queueLimitEnv + config.Default + k
		}
		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.NSQQueueLimit)), 10, 64)
		if err != nil {
			return nil, err
		}

		topicEnv := target.EnvNSQTopic
		if k != config.Default {
			topicEnv = topicEnv + config.Default + k
		}
		queueDirEnv := target.EnvNSQQueueDir
		if k != config.Default {
			queueDirEnv = queueDirEnv + config.Default + k
		}

		nsqArgs := target.NSQArgs{
			Enable:      enabled,
			NSQDAddress: *nsqdAddress,
			Topic:       env.Get(topicEnv, kv.Get(target.NSQTopic)),
			QueueDir:    env.Get(queueDirEnv, kv.Get(target.NSQQueueDir)),
			QueueLimit:  queueLimit,
		}
		nsqArgs.TLS.Enable = env.Get(tlsEnableEnv, kv.Get(target.NSQTLS)) == config.EnableOn
		nsqArgs.TLS.SkipVerify = env.Get(tlsSkipVerifyEnv, kv.Get(target.NSQTLSSkipVerify)) == config.EnableOn

		if err = nsqArgs.Validate(); err != nil {
			return nil, err
		}

		nsqTargets[k] = nsqArgs
	}
	return nsqTargets, nil
}

// DefaultPostgresKVS - default Postgres KV for server config.
var (
	DefaultPostgresKVS = config.KVS{
		config.KV{
			Key:   config.Enable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.PostgresFormat,
			Value: formatNamespace,
		},
		config.KV{
			Key:   target.PostgresConnectionString,
			Value: "",
		},
		config.KV{
			Key:   target.PostgresTable,
			Value: "",
		},
		config.KV{
			Key:   target.PostgresQueueDir,
			Value: "",
		},
		config.KV{
			Key:   target.PostgresQueueLimit,
			Value: "0",
		},
		config.KV{
			Key:   target.PostgresMaxOpenConnections,
			Value: "2",
		},
	}
)

// GetNotifyPostgres - returns a map of registered notification 'postgres' targets
func GetNotifyPostgres(postgresKVS map[string]config.KVS) (map[string]target.PostgreSQLArgs, error) {
	psqlTargets := make(map[string]target.PostgreSQLArgs)
	for k, kv := range mergeTargets(postgresKVS, target.EnvPostgresEnable, DefaultPostgresKVS) {
		enableEnv := target.EnvPostgresEnable
		if k != config.Default {
			enableEnv = enableEnv + config.Default + k
		}

		enabled, err := config.ParseBool(env.Get(enableEnv, kv.Get(config.Enable)))
		if err != nil {
			return nil, err
		}
		if !enabled {
			continue
		}

		queueLimitEnv := target.EnvPostgresQueueLimit
		if k != config.Default {
			queueLimitEnv = queueLimitEnv + config.Default + k
		}

		queueLimit, err := strconv.Atoi(env.Get(queueLimitEnv, kv.Get(target.PostgresQueueLimit)))
		if err != nil {
			return nil, err
		}

		formatEnv := target.EnvPostgresFormat
		if k != config.Default {
			formatEnv = formatEnv + config.Default + k
		}

		connectionStringEnv := target.EnvPostgresConnectionString
		if k != config.Default {
			connectionStringEnv = connectionStringEnv + config.Default + k
		}

		tableEnv := target.EnvPostgresTable
		if k != config.Default {
			tableEnv = tableEnv + config.Default + k
		}

		queueDirEnv := target.EnvPostgresQueueDir
		if k != config.Default {
			queueDirEnv = queueDirEnv + config.Default + k
		}

		maxOpenConnectionsEnv := target.EnvPostgresMaxOpenConnections
		if k != config.Default {
			maxOpenConnectionsEnv = maxOpenConnectionsEnv + config.Default + k
		}

		maxOpenConnections, cErr := strconv.Atoi(env.Get(maxOpenConnectionsEnv, kv.Get(target.PostgresMaxOpenConnections)))
		if cErr != nil {
			return nil, cErr
		}

		psqlArgs := target.PostgreSQLArgs{
			Enable:             enabled,
			Format:             env.Get(formatEnv, kv.Get(target.PostgresFormat)),
			ConnectionString:   env.Get(connectionStringEnv, kv.Get(target.PostgresConnectionString)),
			Table:              env.Get(tableEnv, kv.Get(target.PostgresTable)),
			QueueDir:           env.Get(queueDirEnv, kv.Get(target.PostgresQueueDir)),
			QueueLimit:         uint64(queueLimit),
			MaxOpenConnections: maxOpenConnections,
		}
		if err = psqlArgs.Validate(); err != nil {
			return nil, err
		}
		psqlTargets[k] = psqlArgs
	}

	return psqlTargets, nil
}

// DefaultRedisKVS - default KV for redis config
var (
	DefaultRedisKVS = config.KVS{
		config.KV{
			Key:   config.Enable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.RedisFormat,
			Value: formatNamespace,
		},
		config.KV{
			Key:   target.RedisAddress,
			Value: "",
		},
		config.KV{
			Key:   target.RedisKey,
			Value: "",
		},
		config.KV{
			Key:   target.RedisPassword,
			Value: "",
		},
		config.KV{
			Key:   target.RedisQueueDir,
			Value: "",
		},
		config.KV{
			Key:   target.RedisQueueLimit,
			Value: "0",
		},
	}
)

// GetNotifyRedis - returns a map of registered notification 'redis' targets
func GetNotifyRedis(redisKVS map[string]config.KVS) (map[string]target.RedisArgs, error) {
	redisTargets := make(map[string]target.RedisArgs)
	for k, kv := range mergeTargets(redisKVS, target.EnvRedisEnable, DefaultRedisKVS) {
		enableEnv := target.EnvRedisEnable
		if k != config.Default {
			enableEnv = enableEnv + config.Default + k
		}

		enabled, err := config.ParseBool(env.Get(enableEnv, kv.Get(config.Enable)))
		if err != nil {
			return nil, err
		}
		if !enabled {
			continue
		}

		addressEnv := target.EnvRedisAddress
		if k != config.Default {
			addressEnv = addressEnv + config.Default + k
		}
		addr, err := xnet.ParseHost(env.Get(addressEnv, kv.Get(target.RedisAddress)))
		if err != nil {
			return nil, err
		}
		queueLimitEnv := target.EnvRedisQueueLimit
		if k != config.Default {
			queueLimitEnv = queueLimitEnv + config.Default + k
		}
		queueLimit, err := strconv.Atoi(env.Get(queueLimitEnv, kv.Get(target.RedisQueueLimit)))
		if err != nil {
			return nil, err
		}
		formatEnv := target.EnvRedisFormat
		if k != config.Default {
			formatEnv = formatEnv + config.Default + k
		}
		passwordEnv := target.EnvRedisPassword
		if k != config.Default {
			passwordEnv = passwordEnv + config.Default + k
		}
		keyEnv := target.EnvRedisKey
		if k != config.Default {
			keyEnv = keyEnv + config.Default + k
		}
		queueDirEnv := target.EnvRedisQueueDir
		if k != config.Default {
			queueDirEnv = queueDirEnv + config.Default + k
		}
		redisArgs := target.RedisArgs{
			Enable:     enabled,
			Format:     env.Get(formatEnv, kv.Get(target.RedisFormat)),
			Addr:       *addr,
			Password:   env.Get(passwordEnv, kv.Get(target.RedisPassword)),
			Key:        env.Get(keyEnv, kv.Get(target.RedisKey)),
			QueueDir:   env.Get(queueDirEnv, kv.Get(target.RedisQueueDir)),
			QueueLimit: uint64(queueLimit),
		}
		if err = redisArgs.Validate(); err != nil {
			return nil, err
		}
		redisTargets[k] = redisArgs
	}
	return redisTargets, nil
}

// DefaultWebhookKVS - default KV for webhook config
var (
	DefaultWebhookKVS = config.KVS{
		config.KV{
			Key:   config.Enable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.WebhookEndpoint,
			Value: "",
		},
		config.KV{
			Key:   target.WebhookAuthToken,
			Value: "",
		},
		config.KV{
			Key:   target.WebhookQueueLimit,
			Value: "0",
		},
		config.KV{
			Key:   target.WebhookQueueDir,
			Value: "",
		},
		config.KV{
			Key:   target.WebhookClientCert,
			Value: "",
		},
		config.KV{
			Key:   target.WebhookClientKey,
			Value: "",
		},
	}
)

// GetNotifyWebhook - returns a map of registered notification 'webhook' targets
func GetNotifyWebhook(webhookKVS map[string]config.KVS, transport *http.Transport) (
	map[string]target.WebhookArgs, error) {
	webhookTargets := make(map[string]target.WebhookArgs)
	for k, kv := range mergeTargets(webhookKVS, target.EnvWebhookEnable, DefaultWebhookKVS) {
		enableEnv := target.EnvWebhookEnable
		if k != config.Default {
			enableEnv = enableEnv + config.Default + k
		}
		enabled, err := config.ParseBool(env.Get(enableEnv, kv.Get(config.Enable)))
		if err != nil {
			return nil, err
		}
		if !enabled {
			continue
		}
		urlEnv := target.EnvWebhookEndpoint
		if k != config.Default {
			urlEnv = urlEnv + config.Default + k
		}
		url, err := xnet.ParseHTTPURL(env.Get(urlEnv, kv.Get(target.WebhookEndpoint)))
		if err != nil {
			return nil, err
		}
		queueLimitEnv := target.EnvWebhookQueueLimit
		if k != config.Default {
			queueLimitEnv = queueLimitEnv + config.Default + k
		}
		queueLimit, err := strconv.Atoi(env.Get(queueLimitEnv, kv.Get(target.WebhookQueueLimit)))
		if err != nil {
			return nil, err
		}
		queueDirEnv := target.EnvWebhookQueueDir
		if k != config.Default {
			queueDirEnv = queueDirEnv + config.Default + k
		}
		authEnv := target.EnvWebhookAuthToken
		if k != config.Default {
			authEnv = authEnv + config.Default + k
		}
		clientCertEnv := target.EnvWebhookClientCert
		if k != config.Default {
			clientCertEnv = clientCertEnv + config.Default + k
		}

		clientKeyEnv := target.EnvWebhookClientKey
		if k != config.Default {
			clientKeyEnv = clientKeyEnv + config.Default + k
		}

		webhookArgs := target.WebhookArgs{
			Enable:     enabled,
			Endpoint:   *url,
			Transport:  transport,
			AuthToken:  env.Get(authEnv, kv.Get(target.WebhookAuthToken)),
			QueueDir:   env.Get(queueDirEnv, kv.Get(target.WebhookQueueDir)),
			QueueLimit: uint64(queueLimit),
			ClientCert: env.Get(clientCertEnv, kv.Get(target.WebhookClientCert)),
			ClientKey:  env.Get(clientKeyEnv, kv.Get(target.WebhookClientKey)),
		}
		if err = webhookArgs.Validate(); err != nil {
			return nil, err
		}
		webhookTargets[k] = webhookArgs
	}
	return webhookTargets, nil
}

// DefaultESKVS - default KV config for Elasticsearch target
var (
	DefaultESKVS = config.KVS{
		config.KV{
			Key:   config.Enable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.ElasticURL,
			Value: "",
		},
		config.KV{
			Key:   target.ElasticFormat,
			Value: formatNamespace,
		},
		config.KV{
			Key:   target.ElasticIndex,
			Value: "",
		},
		config.KV{
			Key:   target.ElasticQueueDir,
			Value: "",
		},
		config.KV{
			Key:   target.ElasticQueueLimit,
			Value: "0",
		},
		config.KV{
			Key:   target.ElasticUsername,
			Value: "",
		},
		config.KV{
			Key:   target.ElasticPassword,
			Value: "",
		},
	}
)

// GetNotifyES - returns a map of registered notification 'elasticsearch' targets
func GetNotifyES(esKVS map[string]config.KVS, transport *http.Transport) (map[string]target.ElasticsearchArgs, error) {
	esTargets := make(map[string]target.ElasticsearchArgs)
	for k, kv := range mergeTargets(esKVS, target.EnvElasticEnable, DefaultESKVS) {
		enableEnv := target.EnvElasticEnable
		if k != config.Default {
			enableEnv = enableEnv + config.Default + k
		}
		enabled, err := config.ParseBool(env.Get(enableEnv, kv.Get(config.Enable)))
		if err != nil {
			return nil, err
		}
		if !enabled {
			continue
		}

		urlEnv := target.EnvElasticURL
		if k != config.Default {
			urlEnv = urlEnv + config.Default + k
		}

		url, err := xnet.ParseHTTPURL(env.Get(urlEnv, kv.Get(target.ElasticURL)))
		if err != nil {
			return nil, err
		}

		queueLimitEnv := target.EnvElasticQueueLimit
		if k != config.Default {
			queueLimitEnv = queueLimitEnv + config.Default + k
		}

		queueLimit, err := strconv.Atoi(env.Get(queueLimitEnv, kv.Get(target.ElasticQueueLimit)))
		if err != nil {
			return nil, err
		}

		formatEnv := target.EnvElasticFormat
		if k != config.Default {
			formatEnv = formatEnv + config.Default + k
		}

		indexEnv := target.EnvElasticIndex
		if k != config.Default {
			indexEnv = indexEnv + config.Default + k
		}

		queueDirEnv := target.EnvElasticQueueDir
		if k != config.Default {
			queueDirEnv = queueDirEnv + config.Default + k
		}

		usernameEnv := target.EnvElasticUsername
		if k != config.Default {
			usernameEnv = usernameEnv + config.Default + k
		}

		passwordEnv := target.EnvElasticPassword
		if k != config.Default {
			passwordEnv = passwordEnv + config.Default + k
		}

		esArgs := target.ElasticsearchArgs{
			Enable:     enabled,
			Format:     env.Get(formatEnv, kv.Get(target.ElasticFormat)),
			URL:        *url,
			Index:      env.Get(indexEnv, kv.Get(target.ElasticIndex)),
			QueueDir:   env.Get(queueDirEnv, kv.Get(target.ElasticQueueDir)),
			QueueLimit: uint64(queueLimit),
			Transport:  transport,
			Username:   env.Get(usernameEnv, kv.Get(target.ElasticUsername)),
			Password:   env.Get(passwordEnv, kv.Get(target.ElasticPassword)),
		}
		if err = esArgs.Validate(); err != nil {
			return nil, err
		}
		esTargets[k] = esArgs
	}
	return esTargets, nil
}

// DefaultAMQPKVS - default KV for AMQP config
var (
	DefaultAMQPKVS = config.KVS{
		config.KV{
			Key:   config.Enable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.AmqpURL,
			Value: "",
		},
		config.KV{
			Key:   target.AmqpExchange,
			Value: "",
		},
		config.KV{
			Key:   target.AmqpExchangeType,
			Value: "",
		},
		config.KV{
			Key:   target.AmqpRoutingKey,
			Value: "",
		},
		config.KV{
			Key:   target.AmqpMandatory,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.AmqpDurable,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.AmqpNoWait,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.AmqpInternal,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.AmqpAutoDeleted,
			Value: config.EnableOff,
		},
		config.KV{
			Key:   target.AmqpDeliveryMode,
			Value: "0",
		},
		config.KV{
			Key:   target.AmqpQueueLimit,
			Value: "0",
		},
		config.KV{
			Key:   target.AmqpQueueDir,
			Value: "",
		},
	}
)

// GetNotifyAMQP - returns a map of registered notification 'amqp' targets
func GetNotifyAMQP(amqpKVS map[string]config.KVS) (map[string]target.AMQPArgs, error) {
	amqpTargets := make(map[string]target.AMQPArgs)
	for k, kv := range mergeTargets(amqpKVS, target.EnvAMQPEnable, DefaultAMQPKVS) {
		enableEnv := target.EnvAMQPEnable
		if k != config.Default {
			enableEnv = enableEnv + config.Default + k
		}
		enabled, err := config.ParseBool(env.Get(enableEnv, kv.Get(config.Enable)))
		if err != nil {
			return nil, err
		}
		if !enabled {
			continue
		}
		urlEnv := target.EnvAMQPURL
		if k != config.Default {
			urlEnv = urlEnv + config.Default + k
		}
		url, err := xnet.ParseURL(env.Get(urlEnv, kv.Get(target.AmqpURL)))
		if err != nil {
			return nil, err
		}
		deliveryModeEnv := target.EnvAMQPDeliveryMode
		if k != config.Default {
			deliveryModeEnv = deliveryModeEnv + config.Default + k
		}
		deliveryMode, err := strconv.Atoi(env.Get(deliveryModeEnv, kv.Get(target.AmqpDeliveryMode)))
		if err != nil {
			return nil, err
		}
		exchangeEnv := target.EnvAMQPExchange
		if k != config.Default {
			exchangeEnv = exchangeEnv + config.Default + k
		}
		routingKeyEnv := target.EnvAMQPRoutingKey
		if k != config.Default {
			routingKeyEnv = routingKeyEnv + config.Default + k
		}
		exchangeTypeEnv := target.EnvAMQPExchangeType
		if k != config.Default {
			exchangeTypeEnv = exchangeTypeEnv + config.Default + k
		}
		mandatoryEnv := target.EnvAMQPMandatory
		if k != config.Default {
			mandatoryEnv = mandatoryEnv + config.Default + k
		}
		immediateEnv := target.EnvAMQPImmediate
		if k != config.Default {
			immediateEnv = immediateEnv + config.Default + k
		}
		durableEnv := target.EnvAMQPDurable
		if k != config.Default {
			durableEnv = durableEnv + config.Default + k
		}
		internalEnv := target.EnvAMQPInternal
		if k != config.Default {
			internalEnv = internalEnv + config.Default + k
		}
		noWaitEnv := target.EnvAMQPNoWait
		if k != config.Default {
			noWaitEnv = noWaitEnv + config.Default + k
		}
		autoDeletedEnv := target.EnvAMQPAutoDeleted
		if k != config.Default {
			autoDeletedEnv = autoDeletedEnv + config.Default + k
		}
		queueDirEnv := target.EnvAMQPQueueDir
		if k != config.Default {
			queueDirEnv = queueDirEnv + config.Default + k
		}
		queueLimitEnv := target.EnvAMQPQueueLimit
		if k != config.Default {
			queueLimitEnv = queueLimitEnv + config.Default + k
		}
		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.AmqpQueueLimit)), 10, 64)
		if err != nil {
			return nil, err
		}
		amqpArgs := target.AMQPArgs{
			Enable:       enabled,
			URL:          *url,
			Exchange:     env.Get(exchangeEnv, kv.Get(target.AmqpExchange)),
			RoutingKey:   env.Get(routingKeyEnv, kv.Get(target.AmqpRoutingKey)),
			ExchangeType: env.Get(exchangeTypeEnv, kv.Get(target.AmqpExchangeType)),
			DeliveryMode: uint8(deliveryMode),
			Mandatory:    env.Get(mandatoryEnv, kv.Get(target.AmqpMandatory)) == config.EnableOn,
			Immediate:    env.Get(immediateEnv, kv.Get(target.AmqpImmediate)) == config.EnableOn,
			Durable:      env.Get(durableEnv, kv.Get(target.AmqpDurable)) == config.EnableOn,
			Internal:     env.Get(internalEnv, kv.Get(target.AmqpInternal)) == config.EnableOn,
			NoWait:       env.Get(noWaitEnv, kv.Get(target.AmqpNoWait)) == config.EnableOn,
			AutoDeleted:  env.Get(autoDeletedEnv, kv.Get(target.AmqpAutoDeleted)) == config.EnableOn,
			QueueDir:     env.Get(queueDirEnv, kv.Get(target.AmqpQueueDir)),
			QueueLimit:   queueLimit,
		}
		if err = amqpArgs.Validate(); err != nil {
			return nil, err
		}
		amqpTargets[k] = amqpArgs
	}
	return amqpTargets, nil
}