75 lines
1.8 KiB
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
|
|
}
|