fetch method to fetch events from nip19 codes and relay hints.

fetch.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/nbd-wtf/go-nostr"
+	"github.com/nbd-wtf/go-nostr/nip19"
+	"github.com/urfave/cli/v2"
+)
+
+var fetch = &cli.Command{
+	Name:        "fetch",
+	Usage:       "fetches events related to the given nip19 code from the included relay hints",
+	Description: ``,
+	Flags:       []cli.Flag{},
+	ArgsUsage:   "[nip19code]",
+	Action: func(c *cli.Context) error {
+		filter := nostr.Filter{}
+		code := c.Args().First()
+
+		prefix, value, err := nip19.Decode(code)
+		if err != nil {
+			return err
+		}
+
+		var relays []string
+		switch prefix {
+		case "nevent":
+			v := value.(nostr.EventPointer)
+			filter.IDs = append(filter.IDs, v.ID)
+			if v.Author != "" {
+				// TODO fetch relays from nip65
+			}
+			relays = v.Relays
+		case "naddr":
+			v := value.(nostr.EntityPointer)
+			filter.Tags = nostr.TagMap{"d": []string{v.Identifier}}
+			filter.Kinds = append(filter.Kinds, v.Kind)
+			filter.Authors = append(filter.Authors, v.PublicKey)
+			// TODO fetch relays from nip65
+			relays = v.Relays
+		case "nprofile":
+			v := value.(nostr.ProfilePointer)
+			filter.Authors = append(filter.Authors, v.PublicKey)
+			// TODO fetch relays from nip65
+			relays = v.Relays
+		}
+
+		if len(relays) == 0 {
+			return fmt.Errorf("no relay hints found")
+		}
+
+		pool := nostr.NewSimplePool(c.Context)
+		for ie := range pool.SubManyEose(c.Context, relays, nostr.Filters{filter}) {
+			fmt.Println(ie.Event)
+		}
+
+		return nil
+	},
+}

main.go

@@ -14,6 +14,7 @@ func main() {
 		Commands: []*cli.Command{
 			req,
 			count,
+			fetch,
 			event,
 			decode,
 			encode,