Docs in server.yml, schemaVersion table, refactoring

cmd/webpush.go

@@ -0,0 +1,50 @@
+//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:      "webpush",
+	Usage:     "Generate keys, in the future manage web push subscriptions",
+	UsageText: "ntfy web-push [generate-keys]",
+	Category:  categoryServer,
+
+	Subcommands: []*cli.Command{
+		{
+			Action:    generateWebPushKeys,
+			Name:      "keys",
+			Usage:     "Generate VAPID keys to enable browser background push notifications",
+			UsageText: "ntfy web-push generate-keys",
+			Category:  categoryServer,
+		},
+	},
+}
+
+func generateWebPushKeys(c *cli.Context) error {
+	privateKey, publicKey, err := webpush.GenerateVAPIDKeys()
+	if err != nil {
+		return err
+	}
+
+	fmt.Fprintf(c.App.ErrWriter, `Web Push keys generated. Add the following lines to your config file:
+
+web-push-public-key: %s
+web-push-private-key: %s
+web-push-subscriptions-file: /var/cache/ntfy/webpush.db # or similar
+web-push-email-address: <email address>
+
+See https://ntfy.sh/docs/config/#web-push for details.
+`, publicKey, privateKey)
+
+	return nil
+}