fix aws arnrole

lib/get-aws-sts-token.js

@@ -5,27 +5,27 @@ const EXPIRY = 3600;
 
 async function getAwsAuthToken(
   logger, createHash, retrieveHash,
-  awsAccessKeyId, awsSecretAccessKey, awsRegion, roleArn = null) {
+  {accessKeyId, secretAccessKey, region, RoleArn}) {
   logger = logger || noopLogger;
   try {
-    const key = makeAwsKey(roleArn || awsAccessKeyId);
+    const key = makeAwsKey(roleArn || accessKeyId);
     const obj = await retrieveHash(key);
     if (obj) return {...obj, servedFromCache: true};
 
     let data;
-    if (roleArn) {
-      const stsClient = new STSClient({ region: awsRegion});
-      const roleToAssume = { RoleArn: roleArn, RoleSessionName: 'Jambonz_Speech', DurationSeconds: EXPIRY};
+    if (RoleArn) {
+      const stsClient = new STSClient({ region });
+      const roleToAssume = { RoleArn, RoleSessionName: 'Jambonz_Speech', DurationSeconds: EXPIRY};
       const command = new AssumeRoleCommand(roleToAssume);
 
       data = await stsClient.send(command);
     } else {
       /* access token not found in cache, so generate it using STS */
       const stsClient = new STSClient({
-        region: awsRegion,
+        region,
         credentials: {
-          accessKeyId: awsAccessKeyId,
-          secretAccessKey: awsSecretAccessKey,
+          accessKeyId,
+          secretAccessKey,
         }
       });
       const command = new GetSessionTokenCommand({DurationSeconds: EXPIRY});