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sns.go
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sns.go
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package notification
import (
"encoding/json"
"log"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sns"
)
// AWSPublisher is a AWS SNS implementation of the `Service` interface
type AWSPublisher struct {
PlatformApplicationArn string
SNS *sns.SNS
}
type snsMessage struct {
Default string `json:"default"`
APNS string `json:"APNS"`
APNSSandbox string `json:"APNS_SANDBOX"`
GCM string `json:"GCM"`
ADM string `json:"ADM"`
}
type apns struct {
Aps aps `json:"aps"`
}
type aps struct {
Alert alert `json:"alert"`
}
type alert struct {
Title string `json:"title"`
Body string `json:"body"`
}
type gcm struct {
Data data `json:"data"`
}
type adm struct {
Data data `json:"data"`
}
type data struct {
Message string `json:"message"`
URL string `json:"url"`
}
// NewAWS is a contructor of the `AWSPublisher`
func NewAWS(
accessKey string,
secretKey string,
arn string,
) AWSPublisher {
sess := session.Must(session.NewSession(&aws.Config{
Credentials: credentials.NewStaticCredentials(
accessKey, secretKey, "",
),
Region: aws.String("ap-northeast-1"),
}))
svc := sns.New(sess)
return AWSPublisher{
PlatformApplicationArn: arn,
SNS: svc,
}
}
// Send a notification by using AWS SNS
func (a AWSPublisher) Send(input Input) error {
log.Println(input)
edarn, err := a.createEndpoint(input.DeviceToken)
if err != nil {
return err
}
msg, err := a.newMessage(input.Title, input.Message, input.URL)
if err != nil {
return err
}
log.Println(msg)
return a.publish(edarn, msg)
}
func (a AWSPublisher) publish(targetArn string, message string) error {
ipt := &sns.PublishInput{
MessageStructure: aws.String("json"),
TargetArn: aws.String(targetArn),
Message: aws.String(message),
}
_, err := a.SNS.Publish(ipt)
return err
}
func (a AWSPublisher) newMessage(title, message, url string) (string, error) {
apnsdata := apns{
Aps: aps{
Alert: alert{
Title: title,
Body: message,
},
},
}
apnsmsg, err := json.Marshal(apnsdata)
if err != nil {
return "", err
}
gcmdata := gcm{
Data: data{
Message: message,
URL: url,
},
}
gcmmsg, err := json.Marshal(gcmdata)
if err != nil {
return "", err
}
admdata := adm{
Data: data{
Message: message,
URL: url,
},
}
admmsg, err := json.Marshal(admdata)
if err != nil {
return "", err
}
snsmsg := snsMessage{
Default: message,
APNS: string(apnsmsg),
APNSSandbox: string(apnsmsg),
GCM: string(gcmmsg),
ADM: string(admmsg),
}
msg, err := json.Marshal(snsmsg)
if err != nil {
return "", err
}
return string(msg), nil
}
func (a AWSPublisher) createEndpoint(deviceToken string) (string, error) {
ipt := &sns.CreatePlatformEndpointInput{
PlatformApplicationArn: &a.PlatformApplicationArn,
Token: &deviceToken,
}
output, err := a.SNS.CreatePlatformEndpoint(ipt)
if err != nil {
return "", err
}
eparn := output.EndpointArn
return *eparn, err
}