fix getPresignedObjectUrl() to use available session token (#1147)

Fixes #1146

Author: balamurugana

api/src/main/java/io/minio/MinioClient.java

@@ -1550,10 +1550,14 @@ public String getPresignedObjectUrl(GetPresignedObjectUrlArgs args)
     if (args.versionId() != null) queryParams.put("versionId", args.versionId());
 
     String region = getRegion(args.bucket(), args.region());
-    HttpUrl url = buildUrl(args.method(), args.bucket(), args.object(), region, queryParams);
-    if (provider == null) return url.toString();
+    if (provider == null) {
+      HttpUrl url = buildUrl(args.method(), args.bucket(), args.object(), region, queryParams);
+      return url.toString();
+    }
 
     Credentials creds = provider.fetch();
+    if (creds.sessionToken() != null) queryParams.put("X-Amz-Security-Token", creds.sessionToken());
+    HttpUrl url = buildUrl(args.method(), args.bucket(), args.object(), region, queryParams);
     Request request =
         createRequest(
             url,

api/src/main/java/io/minio/Signer.java

@@ -78,7 +78,8 @@ public class Signer {
           "user-agent",
           "content-md5",
           "x-amz-content-sha256",
-          "x-amz-date");
+          "x-amz-date",
+          "x-amz-security-token");
 
   private Request request;
   private String contentSha256;