mirror of
https://github.com/binwiederhier/ntfy.git
synced 2024-12-23 02:02:33 +01:00
120 lines
3.3 KiB
Go
120 lines
3.3 KiB
Go
package server
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import (
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"context"
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"encoding/json"
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firebase "firebase.google.com/go"
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"firebase.google.com/go/messaging"
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"fmt"
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"google.golang.org/api/option"
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"heckel.io/ntfy/auth"
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"strings"
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)
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const (
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fcmMessageLimit = 4000
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)
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// maybeTruncateFCMMessage performs best-effort truncation of FCM messages.
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// The docs say the limit is 4000 characters, but during testing it wasn't quite clear
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// what fields matter; so we're just capping the serialized JSON to 4000 bytes.
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func maybeTruncateFCMMessage(m *messaging.Message) *messaging.Message {
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s, err := json.Marshal(m)
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if err != nil {
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return m
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}
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if len(s) > fcmMessageLimit {
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over := len(s) - fcmMessageLimit + 16 // = len("truncated":"1",), sigh ...
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message, ok := m.Data["message"]
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if ok && len(message) > over {
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m.Data["truncated"] = "1"
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m.Data["message"] = message[:len(message)-over]
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}
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}
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return m
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}
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func createFirebaseSubscriber(credentialsFile string, auther auth.Auther) (subscriber, error) {
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fb, err := firebase.NewApp(context.Background(), nil, option.WithCredentialsFile(credentialsFile))
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if err != nil {
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return nil, err
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}
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msg, err := fb.Messaging(context.Background())
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if err != nil {
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return nil, err
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}
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return func(m *message) error {
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fbm, err := toFirebaseMessage(m, auther)
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if err != nil {
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return err
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}
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_, err = msg.Send(context.Background(), fbm)
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return err
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}, nil
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}
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func toFirebaseMessage(m *message, auther auth.Auther) (*messaging.Message, error) {
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var data map[string]string // Mostly matches https://ntfy.sh/docs/subscribe/api/#json-message-format
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switch m.Event {
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case keepaliveEvent, openEvent:
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data = map[string]string{
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"id": m.ID,
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"time": fmt.Sprintf("%d", m.Time),
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"event": m.Event,
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"topic": m.Topic,
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}
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case messageEvent:
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allowForward := true
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if auther != nil {
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allowForward = auther.Authorize(nil, m.Topic, auth.PermissionRead) == nil
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}
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if allowForward {
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data = map[string]string{
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"id": m.ID,
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"time": fmt.Sprintf("%d", m.Time),
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"event": m.Event,
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"topic": m.Topic,
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"priority": fmt.Sprintf("%d", m.Priority),
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"tags": strings.Join(m.Tags, ","),
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"click": m.Click,
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"title": m.Title,
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"message": m.Message,
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"encoding": m.Encoding,
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}
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if len(m.Actions) > 0 {
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actions, err := json.Marshal(m.Actions)
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if err != nil {
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return nil, err
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}
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data["actions"] = string(actions)
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}
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if m.Attachment != nil {
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data["attachment_name"] = m.Attachment.Name
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data["attachment_type"] = m.Attachment.Type
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data["attachment_size"] = fmt.Sprintf("%d", m.Attachment.Size)
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data["attachment_expires"] = fmt.Sprintf("%d", m.Attachment.Expires)
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data["attachment_url"] = m.Attachment.URL
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}
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} else {
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// If anonymous read for a topic is not allowed, we cannot send the message along
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// via Firebase. Instead, we send a "poll_request" message, asking the client to poll.
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data = map[string]string{
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"id": m.ID,
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"time": fmt.Sprintf("%d", m.Time),
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"event": pollRequestEvent,
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"topic": m.Topic,
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}
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}
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}
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var androidConfig *messaging.AndroidConfig
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if m.Priority >= 4 {
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androidConfig = &messaging.AndroidConfig{
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Priority: "high",
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}
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}
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return maybeTruncateFCMMessage(&messaging.Message{
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Topic: m.Topic,
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Data: data,
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Android: androidConfig,
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}), nil
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}
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