well-goknown/vendor/github.com/nbd-wtf/go-nostr/nip42/nip42.go

75 lines
1.8 KiB
Go

package nip42
import (
"net/url"
"strings"
"time"
"github.com/nbd-wtf/go-nostr"
)
// CreateUnsignedAuthEvent creates an event which should be sent via an "AUTH" command.
// If the authentication succeeds, the user will be authenticated as pubkey.
func CreateUnsignedAuthEvent(challenge, pubkey, relayURL string) nostr.Event {
return nostr.Event{
PubKey: pubkey,
CreatedAt: nostr.Now(),
Kind: nostr.KindClientAuthentication,
Tags: nostr.Tags{
nostr.Tag{"relay", relayURL},
nostr.Tag{"challenge", challenge},
},
Content: "",
}
}
// helper function for ValidateAuthEvent.
func parseURL(input string) (*url.URL, error) {
return url.Parse(
strings.ToLower(
strings.TrimSuffix(input, "/"),
),
)
}
// ValidateAuthEvent checks whether event is a valid NIP-42 event for given challenge and relayURL.
// The result of the validation is encoded in the ok bool.
func ValidateAuthEvent(event *nostr.Event, challenge string, relayURL string) (pubkey string, ok bool) {
if event.Kind != nostr.KindClientAuthentication {
return "", false
}
if event.Tags.GetFirst([]string{"challenge", challenge}) == nil {
return "", false
}
expected, err := parseURL(relayURL)
if err != nil {
return "", false
}
found, err := parseURL(event.Tags.GetFirst([]string{"relay", ""}).Value())
if err != nil {
return "", false
}
if expected.Scheme != found.Scheme ||
expected.Host != found.Host ||
expected.Path != found.Path {
return "", false
}
now := time.Now()
if event.CreatedAt.Time().After(now.Add(10*time.Minute)) || event.CreatedAt.Time().Before(now.Add(-10*time.Minute)) {
return "", false
}
// save for last, as it is most expensive operation
// no need to check returned error, since ok == true implies err == nil.
if ok, _ := event.CheckSignature(); !ok {
return "", false
}
return event.PubKey, true
}