Added STS Endpoint Variable

Author: maliankurh

common/etc/nginx/include/s3gateway.js

@@ -405,10 +405,12 @@ function redirectToS3(r) {
     var isDirectoryListing = allow_listing && _isDirectory(uriPath);
 
     if (isDirectoryListing && r.method === 'GET') {
+        _debug_log(r, 'Redirecting to S3Listing..')
         r.internalRedirect("@s3Listing");
     } else if (!isDirectoryListing && uriPath === '/') {
         r.internalRedirect("@error404");
     } else {
+        _debug_log(r, 'Redirecting to S3..')
         r.internalRedirect("@s3");
     }
 }
@@ -1013,11 +1015,12 @@ async function _fetchEC2RoleCredentials() {
 async function _fetchWebIdentityCredentials(r) {
     var arn   = process.env['AWS_ROLE_ARN'];
     var name  = process.env['HOSTNAME'] || 'nginx-s3-gateway';
+    var sts_endpoint = process.env['STS_ENDPOINT'] || 'https://sts.amazonaws.com';
     var token = fs.readFileSync(process.env['AWS_WEB_IDENTITY_TOKEN_FILE']);
 
     var params = "Version=2011-06-15&Action=AssumeRoleWithWebIdentity&RoleArn=" + arn + "&RoleSessionName=" + name + "&WebIdentityToken=" + token;
 
-    var response = await ngx.fetch("https://sts.us-east-1.amazonaws.com?" + params, {
+    var response = await ngx.fetch(sts_endpoint + "?" + params, {
         headers: {
             "Accept": "application/json"
         },