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metadata.go
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metadata.go
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/*
Copyright 2023 The Dapr Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package mqtt
import (
"encoding/pem"
"errors"
"fmt"
"strconv"
"time"
"github.com/dapr/components-contrib/bindings"
"github.com/dapr/components-contrib/internal/utils"
"github.com/dapr/kit/logger"
)
const (
// Keys.
mqttURL = "url"
mqttTopic = "topic"
mqttQOS = "qos" // This key is deprecated
mqttRetain = "retain"
mqttClientID = "consumerID"
mqttCleanSession = "cleanSession"
mqttCACert = "caCert"
mqttClientCert = "clientCert"
mqttClientKey = "clientKey"
mqttBackOffMaxRetries = "backOffMaxRetries"
// Defaults.
defaultQOS = 1
defaultRetain = false
defaultWait = 10 * time.Second
defaultCleanSession = false
)
type metadata struct {
tlsCfg
url string
clientID string
qos byte
retain bool
cleanSession bool
backOffMaxRetries int
topic string
}
type tlsCfg struct {
caCert string
clientCert string
clientKey string
}
func parseMQTTMetaData(md bindings.Metadata, log logger.Logger) (metadata, error) {
m := metadata{}
// required configuration settings
if val, ok := md.Properties[mqttURL]; ok && val != "" {
m.url = val
} else {
return m, errors.New("missing url")
}
if val, ok := md.Properties[mqttTopic]; ok && val != "" {
m.topic = val
} else {
return m, errors.New("missing topic")
}
// optional configuration settings
m.retain = defaultRetain
if val, ok := md.Properties[mqttRetain]; ok && val != "" {
m.retain = utils.IsTruthy(val)
}
if val, ok := md.Properties[mqttClientID]; ok && val != "" {
m.clientID = val
} else {
return m, errors.New("missing consumerID")
}
m.cleanSession = defaultCleanSession
if val, ok := md.Properties[mqttCleanSession]; ok && val != "" {
m.cleanSession = utils.IsTruthy(val)
}
if val, ok := md.Properties[mqttCACert]; ok && val != "" {
if !isValidPEM(val) {
return m, errors.New("invalid ca certificate")
}
m.tlsCfg.caCert = val
}
if val, ok := md.Properties[mqttClientCert]; ok && val != "" {
if !isValidPEM(val) {
return m, errors.New("invalid client certificate")
}
m.tlsCfg.clientCert = val
}
if val, ok := md.Properties[mqttClientKey]; ok && val != "" {
if !isValidPEM(val) {
return m, errors.New("invalid client certificate key")
}
m.tlsCfg.clientKey = val
}
if val, ok := md.Properties[mqttBackOffMaxRetries]; ok && val != "" {
backOffMaxRetriesInt, err := strconv.Atoi(val)
if err != nil {
return m, fmt.Errorf("invalid backOffMaxRetries %s: %v", val, err)
}
m.backOffMaxRetries = backOffMaxRetriesInt
}
// Deprecated options
m.qos = defaultQOS
if val, ok := md.Properties[mqttQOS]; ok && val != "" {
log.Warn("Metadata property 'qos' has been deprecated and is ignored; qos is set to 1")
}
return m, nil
}
// isValidPEM validates the provided input has PEM formatted block.
func isValidPEM(val string) bool {
block, _ := pem.Decode([]byte(val))
return block != nil
}