Separate out key directory

sqlite_directory/sqlite_directory.go

@@ -0,0 +1,35 @@
+package sqlite_directory
+
+import (
+	"context"
+	"crypto/ed25519"
+	"fmt"
+
+	"github.com/common-fate/httpsig/alg_ed25519"
+	"github.com/common-fate/httpsig/verifier"
+
+	"crispbyte.dev/sig-auth/keydirectory"
+)
+
+type InMemoryDirectory struct {
+	records map[string]keydirectory.KeyEntry
+}
+
+func (dir InMemoryDirectory) GetKey(ctx context.Context, keyId string, _ string) (verifier.Algorithm, error) {
+	entry := dir.records[keyId]
+
+	var alg verifier.Algorithm
+	var err error
+
+	switch entry.Alg {
+	case "ed25519":
+		alg = alg_ed25519.Ed25519{
+			PublicKey: entry.PublicKey.(ed25519.PublicKey),
+			Attrs:     entry.UserId,
+		}
+	default:
+		err = fmt.Errorf("unknown algoritm: %s", entry.Alg)
+	}
+
+	return alg, err
+}