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package auth
import (
"context"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"fmt"
"time"
"northwest.io/muxstr/internal/nostr"
)
// NostrCredentials implements credentials.PerRPCCredentials for NIP-98 authentication.
// It automatically signs each gRPC request with a Nostr event (kind 27235) and
// attaches it to the Authorization header.
type NostrCredentials struct {
key *nostr.Key
includePayload bool
}
// NewNostrCredentials creates credentials using the provided key.
// Each RPC call will be authenticated with a freshly signed NIP-98 event.
// The key must have a private key (CanSign() must return true).
func NewNostrCredentials(key *nostr.Key) *NostrCredentials {
return &NostrCredentials{
key: key,
includePayload: false,
}
}
// NewNostrCredentialsWithPayload creates credentials that include payload hashes.
// When enabled, a SHA256 hash of the request body is included in the auth event.
func NewNostrCredentialsWithPayload(key *nostr.Key) *NostrCredentials {
return &NostrCredentials{
key: key,
includePayload: true,
}
}
// GetRequestMetadata implements credentials.PerRPCCredentials.
// It creates and signs a NIP-98 auth event for each request.
func (n *NostrCredentials) GetRequestMetadata(ctx context.Context, uri ...string) (map[string]string, error) {
if len(uri) == 0 {
return nil, fmt.Errorf("no URI provided")
}
// Create kind 27235 event (NIP-98 HTTP Auth)
event := &nostr.Event{
PubKey: n.key.Public(),
CreatedAt: time.Now().Unix(),
Kind: 27235, // NIP-98 HTTP Auth
Tags: nostr.Tags{},
Content: "",
}
// Add URL tag
event.Tags = append(event.Tags, nostr.Tag{"u", uri[0]})
// Add method tag - default to POST for gRPC
// The URI contains the method name, e.g., /nostr.v1.NostrRelay/PublishEvent
event.Tags = append(event.Tags, nostr.Tag{"method", "POST"})
// TODO: Add payload hash if includePayload is true
// This requires access to the request body, which isn't available in GetRequestMetadata
// We could use a context key to pass the payload hash from the application
// Sign the event
if err := n.key.Sign(event); err != nil {
return nil, fmt.Errorf("failed to sign auth event: %w", err)
}
// Encode event as base64 JSON
eventJSON, err := json.Marshal(event)
if err != nil {
return nil, fmt.Errorf("failed to marshal auth event: %w", err)
}
authHeader := "Nostr " + base64.StdEncoding.EncodeToString(eventJSON)
return map[string]string{
"authorization": authHeader,
}, nil
}
// RequireTransportSecurity implements credentials.PerRPCCredentials.
// Returns false to allow usage over insecure connections (for development).
// In production, use TLS and set this to true.
func (n *NostrCredentials) RequireTransportSecurity() bool {
return false
}
// SetRequireTLS configures whether TLS is required.
// When true, the credentials will only work over TLS connections.
type NostrCredentialsWithTLS struct {
*NostrCredentials
}
// NewNostrCredentialsWithTLS creates credentials that require TLS.
func NewNostrCredentialsWithTLS(key *nostr.Key) *NostrCredentialsWithTLS {
return &NostrCredentialsWithTLS{
NostrCredentials: NewNostrCredentials(key),
}
}
// RequireTransportSecurity returns true to enforce TLS.
func (n *NostrCredentialsWithTLS) RequireTransportSecurity() bool {
return true
}
// HashPayload creates a SHA256 hash of the payload for inclusion in auth events.
// This can be used to verify request integrity.
func HashPayload(payload []byte) string {
hash := sha256.Sum256(payload)
return fmt.Sprintf("%x", hash)
}
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