add support for metadata passthru

README.md

@@ -228,6 +228,13 @@ Useful when deploying applications to [fake-s3](https://github.com/jubos/fake-s3
 
 *Default:* `0`
 
+### metadata
+
+Metadata to be sent with the files. This should be an object that will be passed directly to the `Metadata` key in the `putObject` call of the AWS S3 SDK. Keys will be automatically prefixed with `x-amz-meta-` by the AWS SDK. Note that the AWS SDK treats all metadata values as strings. You should typecast your values to strings for explicit control.
+
+*Example value*: `{ 'release-id': process.env.RELEASE_ID }`
+
+*Default:* `null`
 
 ### signatureVersion
 

index.js

@@ -25,6 +25,7 @@ module.exports = {
         expires: EXPIRE_IN_2030,
         dotFolders: false,
         batchSize: 0,
+        metadata: null,
         defaultMimeType: 'application/octet-stream',
         distDir: function(context) {
           return context.distDir;
@@ -68,6 +69,7 @@ module.exports = {
         var dotFolders            = this.readConfig('dotFolders');
         var serverSideEncryption  = this.readConfig('serverSideEncryption');
         var batchSize             = this.readConfig('batchSize');
+        var metadata              = this.readConfig('metadata');
         var defaultMimeType       = this.readConfig('defaultMimeType');
 
         var filesToUpload = distFiles.filter(minimatch.filter(filePattern, { matchBase: true, dot: dotFolders }));
@@ -98,6 +100,7 @@ module.exports = {
           cacheControl: cacheControl,
           expires: expires,
           batchSize: batchSize,
+          metadata: metadata,
           defaultMimeType: defaultMimeType
         };
 

lib/s3.js

@@ -141,6 +141,7 @@ module.exports = CoreObject.extend({
     var brotliCompressedFilePaths = options.brotliCompressedFilePaths || [];
     var cacheControl              = options.cacheControl;
     var expires                   = options.expires;
+    var metadata                  = options.metadata;
     var serverSideEncryption      = options.serverSideEncryption;
 
     var defaultType = options.defaultMimeType || mime.getType('bin');
@@ -187,6 +188,10 @@ module.exports = CoreObject.extend({
       params.ServerSideEncryption = serverSideEncryption;
     }
 
+    if (metadata) {
+      params.Metadata = metadata;
+    }
+
     if (isGzipped) {
       params.ContentEncoding = 'gzip';
     }

tests/index-test.js

@@ -131,7 +131,7 @@ describe('s3 plugin', function() {
         return previous;
       }, []);
 
-      assert.equal(messages.length, 8);
+      assert.equal(messages.length, 9);
     });
 
     describe('required config', function() {

tests/lib/s3-test.js

@@ -149,6 +149,26 @@ describe('s3', function() {
         });
       });
 
+      it('sets Metadata using metadata', function() {
+        var s3Params;
+        s3Client.putObject = function(params, cb) {
+          s3Params = params;
+          cb();
+        };
+
+        var options = {
+          filePaths: ['app.css'],
+          cwd: process.cwd() + '/tests/fixtures/dist',
+          prefix: 'js-app',
+          metadata: { 'test-key': 'test-value' }
+        };
+
+        return assert.isFulfilled(subject.upload(options))
+          .then(function() {
+            assert.deepEqual(s3Params.Metadata, { 'test-key': 'test-value' });
+          });
+      });
+
       it('sends the correct content type params for gzipped files with .gz extension', function() {
         var s3Params;
         s3Client.putObject = function(params, cb) {