maxObjectSize and minObjectSize limitation added at putObjectHandler()

Put() replies back with

   - EntityTooLarge with > 5GB in single PUT operation
   - EntityTooSmall with < 1B in single PUT operation
   - IncompleteBody with ho Content-Length found in HTTP request header

pkg/api/api_object_handlers.go

@@ -139,7 +139,7 @@ func (server *minioAPI) putObjectHandler(w http.ResponseWriter, req *http.Reques
 		return
 	}
 
-	// handle PublicRead ACL here
+	// handle ACL's here at bucket level
 	if !server.isValidOp(w, req, acceptsContentType) {
 		return
 	}
@@ -155,6 +155,19 @@ func (server *minioAPI) putObjectHandler(w http.ResponseWriter, req *http.Reques
 		writeErrorResponse(w, req, InvalidDigest, acceptsContentType, req.URL.Path)
 		return
 	}
+	size := req.Header.Get("Content-Length")
+	if size == "" {
+		writeErrorResponse(w, req, IncompleteBody, acceptsContentType, req.URL.Path)
+		return
+	}
+	if isMaxObjectSize(size) {
+		writeErrorResponse(w, req, EntityTooLarge, acceptsContentType, req.URL.Path)
+		return
+	}
+	if isMinObjectSize(size) {
+		writeErrorResponse(w, req, EntityTooSmall, acceptsContentType, req.URL.Path)
+		return
+	}
 	err := server.driver.CreateObject(bucket, object, "", md5, req.Body)
 	switch err := iodine.ToError(err).(type) {
 	case nil:

pkg/api/utils.go

@@ -1,10 +1,28 @@
+/*
+ * Minimalist Object Storage, (C) 2015 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package api
 
 import (
 	"encoding/base64"
+	"strconv"
 	"strings"
 )
 
+// isValidMD5 - verify if valid md5
 func isValidMD5(md5 string) bool {
 	if md5 == "" {
 		return true
@@ -15,3 +33,35 @@ func isValidMD5(md5 string) bool {
 	}
 	return true
 }
+
+// these should be configurable?
+const (
+	// maximum object size per PUT request is 5GB
+	maxObjectSize = 1024 * 1024 * 1024 * 5
+	// minimum object size per PUT request is 1B
+	minObjectSize = 1
+)
+
+// isMaxObjectSize - verify if max object size
+func isMaxObjectSize(size string) bool {
+	i, err := strconv.ParseInt(size, 10, 64)
+	if err != nil {
+		return true
+	}
+	if i > maxObjectSize {
+		return true
+	}
+	return false
+}
+
+// isMinObjectSize - verify if min object size
+func isMinObjectSize(size string) bool {
+	i, err := strconv.ParseInt(size, 10, 64)
+	if err != nil {
+		return true
+	}
+	if i < minObjectSize {
+		return true
+	}
+	return false
+}