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fcm.go
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fcm.go
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// Copyright 2015-present Oursky Ltd.
//
// 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 push
import (
"context"
"errors"
"fmt"
firebase "firebase.google.com/go"
"firebase.google.com/go/messaging"
"github.com/mitchellh/mapstructure"
"github.com/sirupsen/logrus"
"github.com/skygeario/skygear-server/pkg/server/skydb"
"google.golang.org/api/option"
)
type fcmPushClient interface {
Send(message interface{}) (interface{}, error)
}
type fcmHTTPPushClient struct {
ctx context.Context
fcmMessagingClient *messaging.Client
}
func newFCMHTTPPushClient(serviceAccountKey string) (fcmPushClient, error) {
ctx := context.Background()
opt := option.WithCredentialsJSON([]byte(serviceAccountKey))
app, err := firebase.NewApp(ctx, nil, opt)
if err != nil {
return nil, err
}
client, err := app.Messaging(ctx)
if err != nil {
return nil, err
}
return &fcmHTTPPushClient{
ctx: ctx,
fcmMessagingClient: client,
}, nil
}
func (c *fcmHTTPPushClient) Send(message interface{}) (interface{}, error) {
fcmMessage, _ := message.(*messaging.Message)
return c.fcmMessagingClient.Send(c.ctx, fcmMessage)
}
var createFCMHTTPPushClient = newFCMHTTPPushClient
var isRegistrationTokenNotRegistered = messaging.IsRegistrationTokenNotRegistered
// FCMPusher sends push notifications via FCM.
type FCMPusher struct {
conn skydb.Conn
ServiceAccountKey string
}
func NewFCMPusher(connOpener func() (skydb.Conn, error), serviceAccountKey string) (*FCMPusher, error) {
conn, err := connOpener()
if err != nil {
return nil, err
}
return &FCMPusher{
conn: conn,
ServiceAccountKey: serviceAccountKey,
}, nil
}
// Send sends the dictionary represented by m to device.
func (p *FCMPusher) Send(m Mapper, device skydb.Device) error {
if device.Token == "" {
return fmt.Errorf("fcm: empty device token: %v", device.ID)
}
androidConfig := messaging.AndroidConfig{}
if err := mapFCMMessage(m, &androidConfig); err != nil {
log.Errorf("fcm: failed to convert fcm message: %v", err)
return err
}
message := messaging.Message{
Token: device.Token,
Android: &androidConfig,
}
client, err := createFCMHTTPPushClient(p.ServiceAccountKey)
if err != nil {
log.Errorf("fcm: failed to init fcm push client: %v", err)
return err
}
response, err := client.Send(&message)
if err != nil {
log.Errorf("fcm: failed to call message api: %v", err)
p.handleFailedNotification(device, err)
return err
}
log.Info("fcm: push notification is sent: %v", response)
return nil
}
func (p *FCMPusher) handleFailedNotification(device skydb.Device, err error) {
if isRegistrationTokenNotRegistered(err) {
log.WithFields(logrus.Fields{
"deviceID": device.ID,
"deviceToken": device.Token,
"error": err,
}).Info("fcm: delete device token")
if err := p.conn.DeleteDevice(device.ID); err != nil && err != skydb.ErrDeviceNotFound {
log.WithFields(logrus.Fields{
"deviceID": device.ID,
"deviceToken": device.Token,
"error": err,
}).Error("fcm: failed to delete device token")
return
}
}
return
}
func mapFCMMessage(mapper Mapper, msg interface{}) error {
m := mapper.Map()
var fcmMap map[string]interface{}
fcmMap, ok := m["fcm"].(map[string]interface{})
if !ok {
fcmMap, _ = m["gcm"].(map[string]interface{})
}
if fcmMap == nil {
return errors.New("fcm: payload has no fcm dictionary")
}
config := mapstructure.DecoderConfig{
TagName: "json",
Result: msg,
}
// NewDecoder only returns error when DecoderConfig.Result
// is not a pointer.
decoder, err := mapstructure.NewDecoder(&config)
if err != nil {
panic(err)
}
err = decoder.Decode(fcmMap)
return err
}