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fcm.go
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fcm.go
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package delivery
import (
"context"
"encoding/base64"
firebase "firebase.google.com/go/v4"
"firebase.google.com/go/v4/messaging"
"github.com/pkg/errors"
"github.com/xmtp/example-notification-server-go/pkg/interfaces"
"github.com/xmtp/example-notification-server-go/pkg/options"
"go.uber.org/zap"
"google.golang.org/api/option"
)
type FcmDelivery struct {
logger *zap.Logger
client *messaging.Client
}
func NewFcmDelivery(ctx context.Context, logger *zap.Logger, opts options.FcmOptions) (*FcmDelivery, error) {
creds := option.WithCredentialsJSON([]byte(opts.CredentialsJson))
app, err := firebase.NewApp(ctx, &firebase.Config{
ProjectID: opts.ProjectId,
}, creds)
if err != nil {
return nil, errors.Wrap(err, "failed to initialize firebase app")
}
// Use the auth method to validate the credentials
_, err = app.Auth(ctx)
if err != nil {
return nil, errors.Wrap(err, "firebase credentials failed to validate")
}
messaging, err := app.Messaging(ctx)
if err != nil {
return nil, err
}
return &FcmDelivery{
logger: logger,
client: messaging,
}, nil
}
func (f FcmDelivery) CanDeliver(req interfaces.SendRequest) bool {
return req.Installation.DeliveryMechanism.Kind == interfaces.FCM && req.Installation.DeliveryMechanism.Token != ""
}
func (f FcmDelivery) Send(ctx context.Context, req interfaces.SendRequest) error {
if req.Message == nil {
return errors.New("missing message")
}
message := base64.StdEncoding.EncodeToString(req.Message.Message)
topic := req.Message.ContentTopic
data := map[string]string{
"topic": topic,
"encryptedMessage": message,
"messageType": string(req.MessageContext.MessageType),
}
apnsHeaders := map[string]string{}
androidPriority := "high"
if req.Subscription.IsSilent {
apnsHeaders["apns-push-type"] = "background"
apnsHeaders["apns-priority"] = "5"
androidPriority = "normal"
}
_, err := f.client.Send(ctx, &messaging.Message{
Token: req.Installation.DeliveryMechanism.Token,
Data: data,
Android: &messaging.AndroidConfig{
Data: data,
Priority: androidPriority,
},
Webpush: &messaging.WebpushConfig{
Data: data,
Notification: &messaging.WebpushNotification{
Title: "New message from XMTP",
},
},
APNS: &messaging.APNSConfig{
Headers: apnsHeaders,
Payload: &messaging.APNSPayload{
CustomData: map[string]interface {
}{
"topic": topic,
"encryptedMessage": message,
"messageType": string(req.MessageContext.MessageType),
},
Aps: &messaging.Aps{
ContentAvailable: req.Subscription.IsSilent,
MutableContent: !req.Subscription.IsSilent,
},
},
},
})
return err
}