allow Buffer as an input image for vision (#1488)

* allow Buffer as an input image for vision

* fix linting issues

* remove process.nextTick

Author: calibr

packages/google-cloud-vision/src/index.js

@@ -1269,6 +1269,12 @@ Vision.findImages_ = function(images, callback) {
   images = arrify(images);
 
   function findImage(image, callback) {
+    if (Buffer.isBuffer(image)) {
+      callback(null, {
+        content: image.toString('base64')
+      });
+      return;
+    }
     if (image instanceof Storage.File) {
       callback(null, {
         source: {

packages/google-cloud-vision/system-test/vision.js

@@ -66,6 +66,20 @@ describe('Vision', function() {
     });
   });
 
+  it('should detect from a Buffer', function(done) {
+    var buffer = fs.readFileSync(IMAGES.logo);
+    vision.detect(buffer, ['logos'], function(err, logos) {
+      assert.ifError(err);
+
+      var expected = ['Google'];
+      expected.errors = [];
+
+      assert.deepEqual(logos, expected);
+
+      done();
+    });
+  });
+
   describe('single image', function() {
     var TYPES = ['faces', 'labels', 'safeSearch'];
 

packages/google-cloud-vision/test/index.js

@@ -949,6 +949,22 @@ describe('Vision', function() {
       });
     });
 
+
+    it('should get content from a buffer', function(done) {
+      var base64String = 'aGVsbG8gd29ybGQ=';
+      var buffer = new Buffer(base64String, 'base64');
+
+      Vision.findImages_(buffer, function(err, images) {
+        assert.ifError(err);
+        assert.deepEqual(images, [
+          {
+            content: base64String
+          }
+        ]);
+        done();
+      });
+    });
+
     it('should return an error when file cannot be found', function(done) {
       Vision.findImages_('./not-real-file.png', function(err) {
         assert.strictEqual(err.code, 'ENOENT');