adds logic to upload compressed files with right mime type and right content encoding

Author: sprockow

README.md

@@ -211,6 +211,8 @@ Headers may be specified globally for all files in the bucket by adding a `name`
 
 Headers with more specificity will take precedence over more general ones. For instance, if 'Cache-Control' was set to 'max-age=100' in `ALL_OBJECTS` and to 'max-age=500' in `my/folder/`, the files in `my/folder/` would get a header of 'Cache-Control: max-age=500'.
 
+'Content-Type' is autmomatically inferred from the file extension and added to the header collection. If the file is compressed and has the additional extension `.gz` or `br`, a 'Content-Encoding' header will be added as well to describe the object as gzip or brotli encoded.
+
 ---
 
 **redirectAllRequestsTo**

lib/upload.js

@@ -62,7 +62,7 @@ function uploadFile(aws, bucketName, filePath, fileKey, headers, sse) {
     Bucket: bucketName,
     Key: fileKey,
     Body: fileBuffer,
-    ContentType: mime.getType(filePath)
+    ...getMimeTypeAndContentEncoding(filePath)
   };
 
   if (sse) {
@@ -180,4 +180,24 @@ function groupFilesByOrder(files, orderSpec) {
   return [unmatchedFiles].concat(matchedFiles);
 }
 
+const ContentEncodingMap = {
+  gz: 'gzip',
+  br: 'br'
+};
+
+function getMimeTypeAndContentEncoding(filePath) {
+  const match = /(.+\..+)\.(gz|br)$/.exec(filePath);
+
+  if (match) {
+    const [fullMatch, strippedFilePath, encodingFileEnding] = match;
+
+    return {
+      ContentType: mime.getType(strippedFilePath),
+      ContentEncoding: ContentEncodingMap[encodingFileEnding]
+    };
+  }
+
+  return { ContentType: mime.getType(filePath) };
+}
+
 module.exports = uploadDirectory;