verify.go

package main

import (
	"context"
	"encoding/json"

	"github.com/fiatjaf/cli/v3"
	"github.com/nbd-wtf/go-nostr"
)

var verify = &cli.Command{
	Name:  "verify",
	Usage: "checks the hash and signature of an event given through stdin",
	Description: `example:
		echo '{"id":"a889df6a387419ff204305f4c2d296ee328c3cd4f8b62f205648a541b4554dfb","pubkey":"c6047f9441ed7d6d3045406e95c07cd85c778e4b8cef3ca7abac09b95c709ee5","created_at":1698623783,"kind":1,"tags":[],"content":"hello from the nostr army knife","sig":"84876e1ee3e726da84e5d195eb79358b2b3eaa4d9bd38456fde3e8a2af3f1cd4cda23f23fda454869975b3688797d4c66e12f4c51c1b43c6d2997c5e61865661"}' | nak verify

it outputs nothing if the verification is successful.`,
	DisableSliceFlagSeparator: true,
	Action: func(ctx context.Context, c *cli.Command) error {
		for stdinEvent := range getStdinLinesOrArguments(c.Args()) {
			evt := nostr.Event{}
			if stdinEvent != "" {
				if err := json.Unmarshal([]byte(stdinEvent), &evt); err != nil {
					ctx = lineProcessingError(ctx, "invalid event: %s", err)
					continue
				}
			}

			if evt.GetID() != evt.ID {
				ctx = lineProcessingError(ctx, "invalid .id, expected %s, got %s", evt.GetID(), evt.ID)
				continue
			}

			if ok, err := evt.CheckSignature(); !ok {
				ctx = lineProcessingError(ctx, "invalid signature: %v", err)
				continue
			}
		}

		exitIfLineProcessingError(ctx)
		return nil
	},
}