Add PWA, service worker and Web Push

- Use new notification request/opt-in flow for push
- Implement unsubscribing
- Implement muting
- Implement emojis in title
- Add iOS specific PWA warning
- Don’t use websockets when web push is enabled
- Fix duplicate notifications
- Implement default web push setting
- Implement changing subscription type
- Implement web push subscription refresh
- Implement web push notification click

cmd/serve.go

@@ -94,6 +94,11 @@ var flagsServe = append(
 	altsrc.NewBoolFlag(&cli.BoolFlag{Name: "enable-metrics", Aliases: []string{"enable_metrics"}, EnvVars: []string{"NTFY_ENABLE_METRICS"}, Value: false, Usage: "if set, Prometheus metrics are exposed via the /metrics endpoint"}),
 	altsrc.NewStringFlag(&cli.StringFlag{Name: "metrics-listen-http", Aliases: []string{"metrics_listen_http"}, EnvVars: []string{"NTFY_METRICS_LISTEN_HTTP"}, Usage: "ip:port used to expose the metrics endpoint (implicitly enables metrics)"}),
 	altsrc.NewStringFlag(&cli.StringFlag{Name: "profile-listen-http", Aliases: []string{"profile_listen_http"}, EnvVars: []string{"NTFY_PROFILE_LISTEN_HTTP"}, Usage: "ip:port used to expose the profiling endpoints (implicitly enables profiling)"}),
+	altsrc.NewBoolFlag(&cli.BoolFlag{Name: "web-push-enabled", Aliases: []string{"web_push_enabled"}, EnvVars: []string{"NTFY_WEB_PUSH_ENABLED"}, Usage: "enable web push (requires public and private key)"}),
+	altsrc.NewStringFlag(&cli.StringFlag{Name: "web-push-public-key", Aliases: []string{"web_push_public_key"}, EnvVars: []string{"NTFY_WEB_PUSH_PUBLIC_KEY"}, Usage: "public key used for web push notifications"}),
+	altsrc.NewStringFlag(&cli.StringFlag{Name: "web-push-private-key", Aliases: []string{"web_push_private_key"}, EnvVars: []string{"NTFY_WEB_PUSH_PRIVATE_KEY"}, Usage: "private key used for web push notifications"}),
+	altsrc.NewStringFlag(&cli.StringFlag{Name: "web-push-subscriptions-file", Aliases: []string{"web_push_subscriptions_file"}, EnvVars: []string{"NTFY_WEB_PUSH_SUBSCRIPTIONS_FILE"}, Usage: "file used to store web push subscriptions"}),
+	altsrc.NewStringFlag(&cli.StringFlag{Name: "web-push-email-address", Aliases: []string{"web_push_email_address"}, EnvVars: []string{"NTFY_WEB_PUSH_EMAIL_ADDRESS"}, Usage: "e-mail address of sender, required to use browser push services"}),
 )
 
 var cmdServe = &cli.Command{
@@ -129,6 +134,11 @@ func execServe(c *cli.Context) error {
 	keyFile := c.String("key-file")
 	certFile := c.String("cert-file")
 	firebaseKeyFile := c.String("firebase-key-file")
+	webPushEnabled := c.Bool("web-push-enabled")
+	webPushPrivateKey := c.String("web-push-private-key")
+	webPushPublicKey := c.String("web-push-public-key")
+	webPushSubscriptionsFile := c.String("web-push-subscriptions-file")
+	webPushEmailAddress := c.String("web-push-email-address")
 	cacheFile := c.String("cache-file")
 	cacheDuration := c.Duration("cache-duration")
 	cacheStartupQueries := c.String("cache-startup-queries")
@@ -183,6 +193,8 @@ func execServe(c *cli.Context) error {
 	// Check values
 	if firebaseKeyFile != "" && !util.FileExists(firebaseKeyFile) {
 		return errors.New("if set, FCM key file must exist")
+	} else if webPushEnabled && (webPushPrivateKey == "" || webPushPublicKey == "" || webPushSubscriptionsFile == "" || webPushEmailAddress == "" || baseURL == "") {
+		return errors.New("if web push is enabled, web-push-private-key, web-push-public-key, web-push-subscriptions-file, web-push-email-address, and base-url should be set. run 'ntfy web-push-keys' to generate keys")
 	} else if keepaliveInterval < 5*time.Second {
 		return errors.New("keepalive interval cannot be lower than five seconds")
 	} else if managerInterval < 5*time.Second {
@@ -347,6 +359,11 @@ func execServe(c *cli.Context) error {
 	conf.MetricsListenHTTP = metricsListenHTTP
 	conf.ProfileListenHTTP = profileListenHTTP
 	conf.Version = c.App.Version
+	conf.WebPushEnabled = webPushEnabled
+	conf.WebPushPrivateKey = webPushPrivateKey
+	conf.WebPushPublicKey = webPushPublicKey
+	conf.WebPushSubscriptionsFile = webPushSubscriptionsFile
+	conf.WebPushEmailAddress = webPushEmailAddress
 
 	// Set up hot-reloading of config
 	go sigHandlerConfigReload(config)

cmd/web_push.go

@@ -0,0 +1,39 @@
+//go:build !noserver
+
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/SherClockHolmes/webpush-go"
+	"github.com/urfave/cli/v2"
+)
+
+func init() {
+	commands = append(commands, cmdWebPush)
+}
+
+var cmdWebPush = &cli.Command{
+	Name:      "web-push-keys",
+	Usage:     "Generate web push VAPID keys",
+	UsageText: "ntfy web-push-keys",
+	Category:  categoryServer,
+	Action:    generateWebPushKeys,
+}
+
+func generateWebPushKeys(c *cli.Context) error {
+	privateKey, publicKey, err := webpush.GenerateVAPIDKeys()
+	if err != nil {
+		return err
+	}
+
+	fmt.Fprintf(c.App.ErrWriter, `Add the following lines to your config file:
+web-push-enabled: true
+web-push-public-key: %s
+web-push-private-key: %s
+web-push-subscriptions-file: <filename>
+web-push-email-address: <email address>
+`, publicKey, privateKey)
+
+	return nil
+}