Implement test server

server/key_directory.go

@@ -0,0 +1,40 @@
+package server
+
+import (
+	"context"
+	"crypto"
+	"crypto/ed25519"
+	"fmt"
+
+	"github.com/common-fate/httpsig/alg_ed25519"
+	"github.com/common-fate/httpsig/verifier"
+)
+
+type KeyEntry struct {
+	alg       string
+	publicKey crypto.PublicKey
+	userId    string
+}
+
+type InMemoryDirectory struct {
+	records map[string]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
+}