listen: Add support for HEAD/GET bucket events (minio#634)

Author: vadmeste

bucket-notification.go

@@ -28,10 +28,13 @@ type NotificationEventType string
 // 	http://docs.aws.amazon.com/AmazonS3/latest/dev/NotificationHowTo.html#notification-how-to-event-types-and-destinations
 const (
 	ObjectCreatedAll                     NotificationEventType = "s3:ObjectCreated:*"
-	ObjectCreatePut                                            = "s3:ObjectCreated:Put"
+	ObjectCreatedPut                                           = "s3:ObjectCreated:Put"
 	ObjectCreatedPost                                          = "s3:ObjectCreated:Post"
 	ObjectCreatedCopy                                          = "s3:ObjectCreated:Copy"
-	ObjectCreatedCompleteMultipartUpload                       = "sh:ObjectCreated:CompleteMultipartUpload"
+	ObjectCreatedCompleteMultipartUpload                       = "s3:ObjectCreated:CompleteMultipartUpload"
+	ObjectAccessedGet                                          = "s3:ObjectAccessed:Get"
+	ObjectAccessedHead                                         = "s3:ObjectAccessed:Head"
+	ObjectAccessedAll                                          = "s3:ObjectAccessed:*"
 	ObjectRemovedAll                                           = "s3:ObjectRemoved:*"
 	ObjectRemovedDelete                                        = "s3:ObjectRemoved:Delete"
 	ObjectRemovedDeleteMarkerCreated                           = "s3:ObjectRemoved:DeleteMarkerCreated"

docs/API.md

@@ -1229,6 +1229,7 @@ defer close(doneCh)
 // Listen for bucket notifications on "mybucket" filtered by prefix, suffix and events.
 for notificationInfo := range minioClient.ListenBucketNotification("YOUR-BUCKET", "PREFIX", "SUFFIX", []string{
     "s3:ObjectCreated:*",
+    "s3:ObjectAccessed:*",
     "s3:ObjectRemoved:*",
     }, doneCh) {
     if notificationInfo.Err != nil {

examples/minio/listenbucketnotification.go

@@ -49,6 +49,7 @@ func main() {
 	// Listen for bucket notifications on "mybucket" filtered by prefix, suffix and events.
 	for notificationInfo := range minioClient.ListenBucketNotification("YOUR-BUCKET", "PREFIX", "SUFFIX", []string{
 		"s3:ObjectCreated:*",
+		"s3:ObjectAccessed:*",
 		"s3:ObjectRemoved:*",
 	}, doneCh) {
 		if notificationInfo.Err != nil {