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client.go
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client.go
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// Package apns2 is a go Apple Push Notification Service (APNs) provider that
// allows you to send remote notifications to your iOS, tvOS, and OS X
// apps, using the new APNs HTTP/2 network protocol.
package apns2
import (
"bytes"
"crypto/tls"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"net/url"
"time"
"github.com/riftbit/apns2/token"
"golang.org/x/net/http2"
)
// Apple HTTP/2 Development & Production urls
const (
HostDevelopment = "https://api.development.push.apple.com"
HostProduction = "https://api.push.apple.com"
)
// DefaultHost is a mutable var for testing purposes
var DefaultHost = HostDevelopment
var (
// TLSDialTimeout is the maximum amount of time a dial will wait for a connect
// to complete.
TLSDialTimeout = 20 * time.Second
// HTTPClientTimeout specifies a time limit for requests made by the
// HTTPClient. The timeout includes connection time, any redirects,
// and reading the response body.
HTTPClientTimeout = 60 * time.Second
// TCPKeepAlive specifies the keep-alive period for an active network
// connection. If zero, keep-alives are not enabled.
TCPKeepAlive = 60 * time.Second
// IdleConnTimeout specifies the max idle time of the connection
IdleConnTimeout = 300 * time.Second
)
// DialTLS is the default dial function for creating TLS connections for
// non-proxied HTTPS requests.
var DialTLS = func(network, addr string, cfg *tls.Config) (net.Conn, error) {
dialer := &net.Dialer{
Timeout: TLSDialTimeout,
KeepAlive: TCPKeepAlive,
}
return tls.DialWithDialer(dialer, network, addr, cfg)
}
// Client represents a connection with the APNs
type Client struct {
Host string
Certificate tls.Certificate
Token *token.Token
HTTPClient *http.Client
}
type connectionCloser interface {
CloseIdleConnections()
}
// NewClient returns a new Client with an underlying http.Client configured with
// the correct APNs HTTP/2 transport settings. It does not connect to the APNs
// until the first Notification is sent via the Push method.
//
// As per the Apple APNs Provider API, you should keep a handle on this client
// so that you can keep your connections with APNs open across multiple
// notifications; don’t repeatedly open and close connections. APNs treats rapid
// connection and disconnection as a denial-of-service attack.
//
// If your use case involves multiple long-lived connections, consider using
// the ClientManager, which manages clients for you.
func NewClient(certificate tls.Certificate) *Client {
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{certificate},
}
if len(certificate.Certificate) > 0 {
tlsConfig.BuildNameToCertificate()
}
transport := &http2.Transport{
TLSClientConfig: tlsConfig,
DialTLS: DialTLS,
// We want to globally block creating new TCP connections due to how APNs
// does authentication. Their servers will send a
// SETTINGS_MAX_CONCURRENT_STREAMS of 1 and increase it only after the
// first successful authenticated request has gone through.
StrictMaxConcurrentStreams: true,
}
return &Client{
HTTPClient: &http.Client{
Transport: transport,
Timeout: HTTPClientTimeout,
},
Certificate: certificate,
Host: DefaultHost,
}
}
// NewProxyClient returns a new Client with http proxy enabled
// Since the transport of http1.1 does not support DialTLS with http proxy enabled
// The DialTLS (including TLSDialTimeout and TCPKeepAlive) will be disabled if you use this function
// proxyUrl like http://127.0.0.1:8888
func NewProxyClient(certificate tls.Certificate, proxyURL string) *Client {
if proxyURL == "" {
return NewClient(certificate)
}
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{certificate},
}
if len(certificate.Certificate) > 0 {
tlsConfig.BuildNameToCertificate()
}
transport := &http.Transport{
TLSClientConfig: tlsConfig,
Proxy: func(request *http.Request) (*url.URL, error) {
return url.Parse(proxyURL)
},
IdleConnTimeout: IdleConnTimeout,
}
err := http2.ConfigureTransport(transport)
// if configure failed
if err != nil {
return nil
}
return &Client{
HTTPClient: &http.Client{
Transport: transport,
Timeout: HTTPClientTimeout,
},
Certificate: certificate,
Host: DefaultHost,
}
}
// NewTokenClient returns a new Client with an underlying http.Client configured
// with the correct APNs HTTP/2 transport settings. It does not connect to the APNs
// until the first Notification is sent via the Push method.
//
// As per the Apple APNs Provider API, you should keep a handle on this client
// so that you can keep your connections with APNs open across multiple
// notifications; don’t repeatedly open and close connections. APNs treats rapid
// connection and disconnection as a denial-of-service attack.
func NewTokenClient(token *token.Token) *Client {
transport := &http2.Transport{
DialTLS: DialTLS,
// We want to globally block creating new TCP connections due to how APNs
// does authentication. Their servers will send a
// SETTINGS_MAX_CONCURRENT_STREAMS of 1 and increase it only after the
// first successful authenticated request has gone through.
StrictMaxConcurrentStreams: true,
}
return &Client{
Token: token,
HTTPClient: &http.Client{
Transport: transport,
Timeout: HTTPClientTimeout,
},
Host: DefaultHost,
}
}
// Development sets the Client to use the APNs development push endpoint.
func (c *Client) Development() *Client {
c.Host = HostDevelopment
return c
}
// Production sets the Client to use the APNs production push endpoint.
func (c *Client) Production() *Client {
c.Host = HostProduction
return c
}
// Push sends a Notification to the APNs gateway. If the underlying http.Client
// is not currently connected, this method will attempt to reconnect
// transparently before sending the notification. It will return a Response
// indicating whether the notification was accepted or rejected by the APNs
// gateway, or an error if something goes wrong.
//
// Use PushWithContext if you need better cancellation and timeout control.
func (c *Client) Push(n *Notification) (*Response, error) {
return c.PushWithContext(nil, n)
}
// PushWithContext sends a Notification to the APNs gateway. Context carries a
// deadline and a cancellation signal and allows you to close long running
// requests when the context timeout is exceeded. Context can be nil, for
// backwards compatibility.
//
// If the underlying http.Client is not currently connected, this method will
// attempt to reconnect transparently before sending the notification. It will
// return a Response indicating whether the notification was accepted or
// rejected by the APNs gateway, or an error if something goes wrong.
func (c *Client) PushWithContext(ctx Context, n *Notification) (*Response, error) {
return c.PushWithContextAndToken(ctx, nil, n)
}
// PushWithContextAndToken sends a Notification to the APNs gateway. Context carries a
// deadline and a cancellation signal and allows you to close long running
// requests when the context timeout is exceeded. Context can be nil, for
// backwards compatibility.
//
// If the underlying http.Client is not currently connected, this method will
// attempt to reconnect transparently before sending the notification. It will
// return a Response indicating whether the notification was accepted or
// rejected by the APNs gateway, or an error if something goes wrong.
func (c *Client) PushWithContextAndToken(ctx Context, token *token.Token, n *Notification) (*Response, error) {
payload, err := n.MarshalJSON()
if err != nil {
return nil, err
}
url := fmt.Sprintf("%v/3/device/%v", c.Host, n.DeviceToken)
req, _ := http.NewRequest("POST", url, bytes.NewBuffer(payload))
if token != nil {
c.setCustomTokenHeader(token, req)
} else if c.Token != nil {
err = c.setTokenHeader(req)
if err != nil {
return nil, err
}
}
setHeaders(req, n)
httpRes, err := c.requestWithContext(ctx, req)
if err != nil {
return nil, err
}
defer httpRes.Body.Close()
response := &Response{}
response.StatusCode = httpRes.StatusCode
response.ApnsID = httpRes.Header.Get("apns-id")
decoder := json.NewDecoder(httpRes.Body)
if err := decoder.Decode(&response); err != nil && err != io.EOF {
return &Response{}, err
}
return response, nil
}
// CloseIdleConnections closes any underlying connections which were previously
// connected from previous requests but are now sitting idle. It will not
// interrupt any connections currently in use.
func (c *Client) CloseIdleConnections() {
c.HTTPClient.Transport.(connectionCloser).CloseIdleConnections()
}
func (c *Client) setTokenHeader(r *http.Request) error {
_, err := c.Token.GenerateIfExpired()
if err != nil {
return err
}
r.Header.Set("authorization", fmt.Sprintf("bearer %v", c.Token.Bearer))
return nil
}
func (c *Client) setCustomTokenHeader(token *token.Token, r *http.Request) {
r.Header.Set("authorization", fmt.Sprintf("bearer %v", token.Bearer))
}
func setHeaders(r *http.Request, n *Notification) {
r.Header.Set("Content-Type", "application/json; charset=utf-8")
if n.Topic != "" {
r.Header.Set("apns-topic", n.Topic)
}
if n.ApnsID != "" {
r.Header.Set("apns-id", n.ApnsID)
}
if n.CollapseID != "" {
r.Header.Set("apns-collapse-id", n.CollapseID)
}
if n.Priority > 0 {
r.Header.Set("apns-priority", fmt.Sprintf("%v", n.Priority))
}
if !n.Expiration.IsZero() {
r.Header.Set("apns-expiration", fmt.Sprintf("%v", n.Expiration.Unix()))
}
}