contentType handled properly

Author: premchandars

lib/s3.js

@@ -125,14 +125,14 @@ module.exports = CoreObject.extend({
     var isBrotliCompressed = brotliCompressedFilePaths.indexOf(filePath) !== -1;
 
     if (isGzipped && path.extname(basePath) === '.gz') {
-      var basePathUngzipped = path.basename(basePath, '.gz');
+      var basePathUngzipped = filePath.slice(0, -3);
       if (filePaths && filePaths.indexOf(basePathUngzipped) !== -1) {
         contentType = mime.lookup(basePathUngzipped);
         encoding = mime.charsets.lookup(contentType);
       }
     }
     if (isBrotliCompressed) {
-      var basePathUncompressed = path.basename(basePath, '.br');
+      var basePathUncompressed = filePath.slice(0, -3);
       if (filePaths && filePaths.indexOf(basePathUncompressed) !== -1) {
         contentType = mime.lookup(basePathUncompressed);
         encoding = mime.charsets.lookup(contentType);