nak relay

main.go

@@ -18,6 +18,7 @@ var app = &cli.App{
 		decode,
 		encode,
 		verify,
+		relay,
 	},
 	Flags: []cli.Flag{
 		&cli.BoolFlag{

relay.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/nbd-wtf/go-nostr/nip11"
+	"github.com/urfave/cli/v2"
+)
+
+var relay = &cli.Command{
+	Name:  "relay",
+	Usage: "gets the relay information document for the given relay, as JSON",
+	Description: `example:
+		nak relay nostr.wine
+`,
+	ArgsUsage: "<relay-url>",
+	Action: func(c *cli.Context) error {
+		url := c.Args().First()
+		if url == "" {
+			return fmt.Errorf("specify the <relay-url>")
+		}
+
+		if !strings.HasPrefix(url, "wss://") && !strings.HasPrefix(url, "ws://") {
+			url = "wss://" + url
+		}
+
+		info, err := nip11.Fetch(c.Context, url)
+		if err != nil {
+			return fmt.Errorf("failed to fetch '%s' information document: %w", url, err)
+		}
+
+		pretty, _ := json.MarshalIndent(info, "", "  ")
+		fmt.Println(string(pretty))
+		return nil
+	},
+}