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notification.go
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notification.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"net/http"
"strconv"
"time"
)
// Notification описывает структуру push-уведомления.
type Notification struct {
Token string
ID string
Expiration time.Time
LowPriority bool
Topic string
CollapseID string
Payload interface{}
Sandbox bool
}
// request возвращает сформированный запрос для отправки push-уведомления.
func (n *Notification) Request() (req *http.Request, err error) {
var payload []byte
switch data := n.Payload.(type) {
case []byte:
payload = data
case string:
payload = []byte(data)
case json.RawMessage:
payload = []byte(data)
default:
payload, err = json.Marshal(n.Payload)
if err != nil {
return nil, err
}
}
var host = "https://api.push.apple.com"
if n.Sandbox {
host = "https://api.development.push.apple.com"
}
req, err = http.NewRequest(http.MethodPost,
fmt.Sprintf("%s/3/device/%s", host, n.Token), bytes.NewReader(payload))
if err != nil {
return nil, err
}
req.Header.Set("user-agent", agent)
req.Header.Set("content-type", "application/json")
if n.ID != "" {
req.Header.Set("apns-id", n.ID)
}
if !n.Expiration.IsZero() {
var exp string = "0"
if !n.Expiration.Before(time.Now()) {
exp = strconv.FormatInt(n.Expiration.Unix(), 10)
}
req.Header.Set("apns-expiration", exp)
}
if n.LowPriority {
req.Header.Set("apns-priority", "5")
}
if n.Topic != "" {
req.Header.Set("apns-topic", n.Topic)
}
if n.CollapseID != "" && len(n.CollapseID) <= 64 {
req.Header.Set("apns-collapse-id", n.CollapseID)
}
return req, nil
}