fix: only import RSA, EC and oct successfully

lib/jwk/import.js

@@ -28,14 +28,17 @@ const importKey = (key, parameters) => {
   }
 
   if (key instanceof KeyObject) {
-    if (key.type === 'private') {
-      privateKey = key
-    } else if (key.type === 'public') {
-      publicKey = key
-    } else if (key.type === 'secret') {
-      secret = key
-    } else {
-      throw new errors.JOSENotSupported()
+    switch (key.type) {
+      case 'private':
+        privateKey = key
+        break
+      case 'public':
+        publicKey = key
+        break
+      case 'secret':
+        secret = key
+        break
+      default:
     }
   } else if ('kty' in key && key.kty === 'oct') { // symmetric key <Object>
     try {
@@ -69,20 +72,23 @@ const importKey = (key, parameters) => {
     } catch (err) {}
   }
 
-  if (!privateKey && !publicKey && !secret) {
-    throw new errors.JWKImportFailed('import failed')
-  }
-
   const keyObject = privateKey || publicKey || secret
 
-  switch (keyObject.asymmetricKeyType) {
-    case 'rsa':
-      return new RSAKey(keyObject, parameters)
-    case 'ec':
-      return new ECKey(keyObject, parameters)
-    default:
-      return new OctKey(keyObject, parameters)
+  if (privateKey || publicKey) {
+    switch (keyObject.asymmetricKeyType) {
+      case 'rsa':
+        return new RSAKey(keyObject, parameters)
+      case 'ec':
+        return new ECKey(keyObject, parameters)
+      default:
+        // TODO: test this branch once https://github.com/nodejs/node/pull/26319 is released
+        throw new errors.JOSENotSupported('only RSA ane EC asymmetric keys are supported')
+    }
+  } else if (secret) {
+    return new OctKey(keyObject, parameters)
   }
+
+  throw new errors.JWKImportFailed('import failed')
 }
 
 module.exports = importKey