From 9b59418edf754f2f202572521b819871f8da84c8 Mon Sep 17 00:00:00 2001
From: BigUstad <priyank.raj@gatech.edu>
Date: Tue, 3 Dec 2019 13:27:13 -0800
Subject: [PATCH] Validate bucket name, object name. Fixes #819

---
 api/src/main/java/io/minio/MinioClient.java | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/api/src/main/java/io/minio/MinioClient.java b/api/src/main/java/io/minio/MinioClient.java
index 73ac0287e..542f11b48 100755
--- a/api/src/main/java/io/minio/MinioClient.java
+++ b/api/src/main/java/io/minio/MinioClient.java
@@ -1547,8 +1547,24 @@ public ObjectStat statObject(String bucketName, String objectName, ServerSideEnc
       headers = sse.headers();
     }
 
+    checkBucketName(bucketName);
+    String errorMessage = "";
+    if ( objectName == null ) {
+      errorMessage += " Object name cannot be null.";
+    } else if ( objectName.equals("") ) {
+      errorMessage += " Object name cannot be empty.";
+    }
+    if ( !errorMessage.equals("") ) {
+      throw new InvalidArgumentException("Invalid Stat Object Argument(s)." + errorMessage);
+    }
     HttpResponse response = executeHead(bucketName, objectName, headers);
     ResponseHeader header = response.header();
+    if ( header.contentLength() == 0
+        && header.contentType() == null
+        && header.statusCode() == null ) {
+      throw new InvalidArgumentException("Invalid Stat Object Arguments.");
+    }
+
     Map<String,List<String>> httpHeaders = response.httpHeaders();
     ObjectStat objectStat = new ObjectStat(bucketName, objectName, header, httpHeaders);
     return objectStat;