fs/xl: Combine input checks into re-usable functions. (#3383)

Repeated code around both object layers are moved
and combined into simple re-usable functions.

cmd/bucket-handlers.go

@@ -33,7 +33,7 @@ import (
 // Enforces bucket policies for a bucket for a given tatusaction.
 func enforceBucketPolicy(bucket string, action string, reqURL *url.URL) (s3Error APIErrorCode) {
 	// Verify if bucket actually exists
-	if err := isBucketExist(bucket, newObjectLayerFn()); err != nil {
+	if err := checkBucketExist(bucket, newObjectLayerFn()); err != nil {
 		err = errorCause(err)
 		switch err.(type) {
 		case BucketNameInvalid:

cmd/fs-v1-multipart-common.go

@@ -27,20 +27,6 @@ func (fs fsObjects) isMultipartUpload(bucket, prefix string) bool {
 	return err == nil
 }
 
-// Checks whether bucket exists.
-func (fs fsObjects) isBucketExist(bucket string) bool {
-	// Check whether bucket exists.
-	_, err := fs.storage.StatVol(bucket)
-	if err != nil {
-		if err == errVolumeNotFound {
-			return false
-		}
-		errorIf(err, "Stat failed on bucket "+bucket+".")
-		return false
-	}
-	return true
-}
-
 // isUploadIDExists - verify if a given uploadID exists and is valid.
 func (fs fsObjects) isUploadIDExists(bucket, object, uploadID string) bool {
 	uploadIDPath := path.Join(bucket, object, uploadID)

cmd/fs-v1-multipart-common_test.go

@@ -23,39 +23,6 @@ import (
 	"time"
 )
 
-// TestFSIsBucketExist - complete test of isBucketExist
-func TestFSIsBucketExist(t *testing.T) {
-	// Prepare for testing
-	disk := filepath.Join(os.TempDir(), "minio-"+nextSuffix())
-	defer removeAll(disk)
-
-	obj := initFSObjects(disk, t)
-	fs := obj.(fsObjects)
-	bucketName := "bucket"
-
-	if err := obj.MakeBucket(bucketName); err != nil {
-		t.Fatal("Cannot create bucket, err: ", err)
-	}
-
-	// Test with a valid bucket
-	if found := fs.isBucketExist(bucketName); !found {
-		t.Fatal("isBucketExist should true")
-	}
-
-	// Test with a inexistant bucket
-	if found := fs.isBucketExist("foo"); found {
-		t.Fatal("isBucketExist should false")
-	}
-
-	// Using a faulty disk
-	fsStorage := fs.storage.(*retryStorage)
-	naughty := newNaughtyDisk(fsStorage, nil, errFaultyDisk)
-	fs.storage = naughty
-	if found := fs.isBucketExist(bucketName); found {
-		t.Fatal("isBucketExist should return false because it is wired to a corrupted disk")
-	}
-}
-
 // TestFSIsUploadExists - complete test with valid and invalid cases
 func TestFSIsUploadExists(t *testing.T) {
 	// Prepare for testing

cmd/fs-v1-multipart.go

@@ -26,8 +26,6 @@ import (
 	"path"
 	"strings"
 	"time"
-
-	"github.com/skyrings/skyring-common/tools/uuid"
 )
 
 // listMultipartUploads - lists all multipart uploads.
@@ -172,45 +170,8 @@ func (fs fsObjects) listMultipartUploads(bucket, prefix, keyMarker, uploadIDMark
 // ListMultipartsInfo structure is unmarshalled directly into XML and
 // replied back to the client.
 func (fs fsObjects) ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
-	// Validate input arguments.
-	if !IsValidBucketName(bucket) {
-		return ListMultipartsInfo{}, traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	if !fs.isBucketExist(bucket) {
-		return ListMultipartsInfo{}, traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectPrefix(prefix) {
-		return ListMultipartsInfo{}, traceError(ObjectNameInvalid{Bucket: bucket, Object: prefix})
-	}
-	// Verify if delimiter is anything other than '/', which we do not support.
-	if delimiter != "" && delimiter != slashSeparator {
-		return ListMultipartsInfo{}, traceError(UnsupportedDelimiter{
-			Delimiter: delimiter,
-		})
-	}
-	// Verify if marker has prefix.
-	if keyMarker != "" && !strings.HasPrefix(keyMarker, prefix) {
-		return ListMultipartsInfo{}, traceError(InvalidMarkerPrefixCombination{
-			Marker: keyMarker,
-			Prefix: prefix,
-		})
-	}
-	if uploadIDMarker != "" {
-		if strings.HasSuffix(keyMarker, slashSeparator) {
-			return ListMultipartsInfo{}, traceError(InvalidUploadIDKeyCombination{
-				UploadIDMarker: uploadIDMarker,
-				KeyMarker:      keyMarker,
-			})
-		}
-		id, err := uuid.Parse(uploadIDMarker)
-		if err != nil {
-			return ListMultipartsInfo{}, traceError(err)
-		}
-		if id.IsZero() {
-			return ListMultipartsInfo{}, traceError(MalformedUploadID{
-				UploadID: uploadIDMarker,
-			})
-		}
+	if err := checkListMultipartArgs(bucket, prefix, keyMarker, uploadIDMarker, delimiter, fs); err != nil {
+		return ListMultipartsInfo{}, err
 	}
 	return fs.listMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter, maxUploads)
 }
@@ -256,17 +217,8 @@ func (fs fsObjects) newMultipartUpload(bucket string, object string, meta map[st
 //
 // Implements S3 compatible initiate multipart API.
 func (fs fsObjects) NewMultipartUpload(bucket, object string, meta map[string]string) (string, error) {
-	// Verify if bucket name is valid.
-	if !IsValidBucketName(bucket) {
-		return "", traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify whether the bucket exists.
-	if !fs.isBucketExist(bucket) {
-		return "", traceError(BucketNotFound{Bucket: bucket})
-	}
-	// Verify if object name is valid.
-	if !IsValidObjectName(object) {
-		return "", traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkNewMultipartArgs(bucket, object, fs); err != nil {
+		return "", err
 	}
 	return fs.newMultipartUpload(bucket, object, meta)
 }
@@ -290,16 +242,8 @@ func partToAppend(fsMeta fsMetaV1, fsAppendMeta fsMetaV1) (part objectPartInfo,
 // written to '.minio.sys/tmp' location and safely renamed to
 // '.minio.sys/multipart' for reach parts.
 func (fs fsObjects) PutObjectPart(bucket, object, uploadID string, partID int, size int64, data io.Reader, md5Hex string, sha256sum string) (string, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return "", traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify whether the bucket exists.
-	if !fs.isBucketExist(bucket) {
-		return "", traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return "", traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkPutObjectPartArgs(bucket, object, fs); err != nil {
+		return "", err
 	}
 
 	uploadIDPath := path.Join(bucket, object, uploadID)
@@ -488,16 +432,8 @@ func (fs fsObjects) listObjectParts(bucket, object, uploadID string, partNumberM
 // ListPartsInfo structure is unmarshalled directly into XML and
 // replied back to the client.
 func (fs fsObjects) ListObjectParts(bucket, object, uploadID string, partNumberMarker, maxParts int) (ListPartsInfo, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ListPartsInfo{}, traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify whether the bucket exists.
-	if !fs.isBucketExist(bucket) {
-		return ListPartsInfo{}, traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return ListPartsInfo{}, traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkListPartsArgs(bucket, object, fs); err != nil {
+		return ListPartsInfo{}, err
 	}
 
 	// Hold lock so that there is no competing
@@ -532,19 +468,8 @@ func (fs fsObjects) totalObjectSize(fsMeta fsMetaV1, parts []completePart) (int6
 //
 // Implements S3 compatible Complete multipart API.
 func (fs fsObjects) CompleteMultipartUpload(bucket string, object string, uploadID string, parts []completePart) (string, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return "", traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify whether the bucket exists.
-	if !fs.isBucketExist(bucket) {
-		return "", traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return "", traceError(ObjectNameInvalid{
-			Bucket: bucket,
-			Object: object,
-		})
+	if err := checkCompleteMultipartArgs(bucket, object, fs); err != nil {
+		return "", err
 	}
 
 	uploadIDPath := path.Join(bucket, object, uploadID)
@@ -739,15 +664,8 @@ func (fs fsObjects) abortMultipartUpload(bucket, object, uploadID string) error
 // no affect and further requests to the same uploadID would not be
 // honored.
 func (fs fsObjects) AbortMultipartUpload(bucket, object, uploadID string) error {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	if !fs.isBucketExist(bucket) {
-		return traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkAbortMultipartArgs(bucket, object, fs); err != nil {
+		return err
 	}
 
 	// Hold lock so that there is no competing

cmd/fs-v1.go

@@ -219,13 +219,8 @@ func (fs fsObjects) DeleteBucket(bucket string) error {
 
 // GetObject - get an object.
 func (fs fsObjects) GetObject(bucket, object string, offset int64, length int64, writer io.Writer) (err error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify if object is valid.
-	if !IsValidObjectName(object) {
-		return traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err = checkGetObjArgs(bucket, object); err != nil {
+		return err
 	}
 	// Offset and length cannot be negative.
 	if offset < 0 || length < 0 {
@@ -352,28 +347,16 @@ func (fs fsObjects) getObjectInfo(bucket, object string) (ObjectInfo, error) {
 
 // GetObjectInfo - get object info.
 func (fs fsObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ObjectInfo{}, traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify if object is valid.
-	if !IsValidObjectName(object) {
-		return ObjectInfo{}, traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkGetObjArgs(bucket, object); err != nil {
+		return ObjectInfo{}, err
 	}
 	return fs.getObjectInfo(bucket, object)
 }
 
 // PutObject - create an object.
 func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (objInfo ObjectInfo, err error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ObjectInfo{}, traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return ObjectInfo{}, traceError(ObjectNameInvalid{
-			Bucket: bucket,
-			Object: object,
-		})
+	if err = checkPutObjectArgs(bucket, object, fs); err != nil {
+		return ObjectInfo{}, err
 	}
 	// No metadata is set, allocate a new one.
 	if metadata == nil {
@@ -505,12 +488,8 @@ func (fs fsObjects) PutObject(bucket string, object string, size int64, data io.
 // DeleteObject - deletes an object from a bucket, this operation is destructive
 // and there are no rollbacks supported.
 func (fs fsObjects) DeleteObject(bucket, object string) error {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkDelObjArgs(bucket, object); err != nil {
+		return err
 	}
 
 	// Lock the object before deleting so that an in progress GetObject does not return
@@ -550,31 +529,8 @@ func (fs fsObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKey
 		return
 	}
 
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ListObjectsInfo{}, traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify if bucket exists.
-	if !fs.isBucketExist(bucket) {
-		return ListObjectsInfo{}, traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectPrefix(prefix) {
-		return ListObjectsInfo{}, traceError(ObjectNameInvalid{Bucket: bucket, Object: prefix})
-	}
-	// Verify if delimiter is anything other than '/', which we do not support.
-	if delimiter != "" && delimiter != slashSeparator {
-		return ListObjectsInfo{}, traceError(UnsupportedDelimiter{
-			Delimiter: delimiter,
-		})
-	}
-	// Verify if marker has prefix.
-	if marker != "" {
-		if !strings.HasPrefix(marker, prefix) {
-			return ListObjectsInfo{}, traceError(InvalidMarkerPrefixCombination{
-				Marker: marker,
-				Prefix: prefix,
-			})
-		}
+	if err := checkListObjsArgs(bucket, prefix, marker, delimiter, fs); err != nil {
+		return ListObjectsInfo{}, err
 	}
 
 	// With max keys of zero we have reached eof, return right here.

cmd/object-api-common.go

@@ -276,15 +276,3 @@ func cleanupDir(storage StorageAPI, volume, dirPath string) error {
 	err := delFunc(retainSlash(pathJoin(dirPath)))
 	return err
 }
-
-// Checks whether bucket exists.
-func isBucketExist(bucket string, obj ObjectLayer) error {
-	if !IsValidBucketName(bucket) {
-		return BucketNameInvalid{Bucket: bucket}
-	}
-	_, err := obj.GetBucketInfo(bucket)
-	if err != nil {
-		return BucketNotFound{Bucket: bucket}
-	}
-	return nil
-}

cmd/object-api-input-checks.go

@@ -0,0 +1,161 @@
+/*
+ * Minio Cloud Storage, (C) 2016 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 cmd
+
+import (
+	"strings"
+
+	"github.com/skyrings/skyring-common/tools/uuid"
+)
+
+// Checks on GetObject arguments, bucket and object.
+func checkGetObjArgs(bucket, object string) error {
+	return checkBucketAndObjectNames(bucket, object)
+}
+
+// Checks on DeleteObject arguments, bucket and object.
+func checkDelObjArgs(bucket, object string) error {
+	return checkBucketAndObjectNames(bucket, object)
+}
+
+// Checks bucket and object name validity, returns nil if both are valid.
+func checkBucketAndObjectNames(bucket, object string) error {
+	// Verify if bucket is valid.
+	if !IsValidBucketName(bucket) {
+		return traceError(BucketNameInvalid{Bucket: bucket})
+	}
+	// Verify if object is valid.
+	if !IsValidObjectName(object) {
+		return traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	}
+	return nil
+}
+
+// Checks for all ListObjects arguments validity.
+func checkListObjsArgs(bucket, prefix, marker, delimiter string, obj ObjectLayer) error {
+	// Verify if bucket exists before validating object name.
+	// This is done on purpose since the order of errors is
+	// important here bucket does not exist error should
+	// happen before we return an error for invalid object name.
+	// FIXME: should be moved to handler layer.
+	if err := checkBucketExist(bucket, obj); err != nil {
+		return traceError(err)
+	}
+	// Validates object prefix validity after bucket exists.
+	if !IsValidObjectPrefix(prefix) {
+		return traceError(ObjectNameInvalid{
+			Bucket: bucket,
+			Object: prefix,
+		})
+	}
+	// Verify if delimiter is anything other than '/', which we do not support.
+	if delimiter != "" && delimiter != slashSeparator {
+		return traceError(UnsupportedDelimiter{
+			Delimiter: delimiter,
+		})
+	}
+	// Verify if marker has prefix.
+	if marker != "" && !strings.HasPrefix(marker, prefix) {
+		return traceError(InvalidMarkerPrefixCombination{
+			Marker: marker,
+			Prefix: prefix,
+		})
+	}
+	return nil
+}
+
+// Checks for all ListMultipartUploads arguments validity.
+func checkListMultipartArgs(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, obj ObjectLayer) error {
+	if err := checkListObjsArgs(bucket, prefix, keyMarker, delimiter, obj); err != nil {
+		return err
+	}
+	if uploadIDMarker != "" {
+		if strings.HasSuffix(keyMarker, slashSeparator) {
+			return traceError(InvalidUploadIDKeyCombination{
+				UploadIDMarker: uploadIDMarker,
+				KeyMarker:      keyMarker,
+			})
+		}
+		id, err := uuid.Parse(uploadIDMarker)
+		if err != nil {
+			return traceError(err)
+		}
+		if id.IsZero() {
+			return traceError(MalformedUploadID{
+				UploadID: uploadIDMarker,
+			})
+		}
+	}
+	return nil
+}
+
+// Checks for NewMultipartUpload arguments validity, also validates if bucket exists.
+func checkNewMultipartArgs(bucket, object string, obj ObjectLayer) error {
+	return checkPutObjectArgs(bucket, object, obj)
+}
+
+// Checks for PutObjectPart arguments validity, also validates if bucket exists.
+func checkPutObjectPartArgs(bucket, object string, obj ObjectLayer) error {
+	return checkPutObjectArgs(bucket, object, obj)
+}
+
+// Checks for ListParts arguments validity, also validates if bucket exists.
+func checkListPartsArgs(bucket, object string, obj ObjectLayer) error {
+	return checkPutObjectArgs(bucket, object, obj)
+}
+
+// Checks for CompleteMultipartUpload arguments validity, also validates if bucket exists.
+func checkCompleteMultipartArgs(bucket, object string, obj ObjectLayer) error {
+	return checkPutObjectArgs(bucket, object, obj)
+}
+
+// Checks for AbortMultipartUpload arguments validity, also validates if bucket exists.
+func checkAbortMultipartArgs(bucket, object string, obj ObjectLayer) error {
+	return checkPutObjectArgs(bucket, object, obj)
+}
+
+// Checks for PutObject arguments validity, also validates if bucket exists.
+func checkPutObjectArgs(bucket, object string, obj ObjectLayer) error {
+	// Verify if bucket exists before validating object name.
+	// This is done on purpose since the order of errors is
+	// important here bucket does not exist error should
+	// happen before we return an error for invalid object name.
+	// FIXME: should be moved to handler layer.
+	if err := checkBucketExist(bucket, obj); err != nil {
+		return traceError(err)
+	}
+	// Validates object name validity after bucket exists.
+	if !IsValidObjectName(object) {
+		return traceError(ObjectNameInvalid{
+			Bucket: bucket,
+			Object: object,
+		})
+	}
+	return nil
+}
+
+// Checks whether bucket exists and returns appropriate error if not.
+func checkBucketExist(bucket string, obj ObjectLayer) error {
+	if !IsValidBucketName(bucket) {
+		return BucketNameInvalid{Bucket: bucket}
+	}
+	_, err := obj.GetBucketInfo(bucket)
+	if err != nil {
+		return BucketNotFound{Bucket: bucket}
+	}
+	return nil
+}

cmd/xl-v1-bucket.go

@@ -146,19 +146,6 @@ func (xl xlObjects) getBucketInfo(bucketName string) (bucketInfo BucketInfo, err
 	return BucketInfo{}, err
 }
 
-// Checks whether bucket exists.
-func (xl xlObjects) isBucketExist(bucket string) bool {
-	// Check whether bucket exists.
-	_, err := xl.getBucketInfo(bucket)
-	if err != nil {
-		if err == errVolumeNotFound {
-			return false
-		}
-		return false
-	}
-	return true
-}
-
 // GetBucketInfo - returns BucketInfo for a bucket.
 func (xl xlObjects) GetBucketInfo(bucket string) (BucketInfo, error) {
 	// Verify if bucket is valid.

cmd/xl-v1-healing.go

@@ -28,9 +28,9 @@ func healFormatXL(storageDisks []StorageAPI) (err error) {
 	// Attempt to load all `format.json`.
 	formatConfigs, sErrs := loadAllFormats(storageDisks)
 
-	// Generic format check validates
-	// if (no quorum) return error
-	// if (disks not recognized) // Always error.
+	// Generic format check.
+	// - if (no quorum) return error
+	// - if (disks not recognized) // Always error.
 	if err = genericFormatCheck(formatConfigs, sErrs); err != nil {
 		return err
 	}
@@ -58,14 +58,8 @@ func healFormatXL(storageDisks []StorageAPI) (err error) {
 // also heals the missing entries for bucket metadata files
 // `policy.json, notification.xml, listeners.json`.
 func (xl xlObjects) HealBucket(bucket string) error {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return traceError(BucketNameInvalid{Bucket: bucket})
-	}
-
-	// Verify if bucket exists.
-	if !xl.isBucketExist(bucket) {
-		return traceError(BucketNotFound{Bucket: bucket})
+	if err := checkBucketExist(bucket, xl); err != nil {
+		return err
 	}
 
 	// Heal bucket.
@@ -347,14 +341,8 @@ func healObject(storageDisks []StorageAPI, bucket string, object string, quorum
 // and later the disk comes back up again, heal on the object
 // should delete it.
 func (xl xlObjects) HealObject(bucket, object string) error {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return traceError(BucketNameInvalid{Bucket: bucket})
-	}
-
-	// Verify if object is valid.
-	if !IsValidObjectName(object) {
-		return traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkGetObjArgs(bucket, object); err != nil {
+		return err
 	}
 
 	// Lock the object before healing.

cmd/xl-v1-list-objects-heal.go

@@ -162,31 +162,8 @@ func (xl xlObjects) listObjectsHeal(bucket, prefix, marker, delimiter string, ma
 
 // ListObjects - list all objects at prefix, delimited by '/'.
 func (xl xlObjects) ListObjectsHeal(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ListObjectsInfo{}, traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify if bucket exists.
-	if !xl.isBucketExist(bucket) {
-		return ListObjectsInfo{}, traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectPrefix(prefix) {
-		return ListObjectsInfo{}, traceError(ObjectNameInvalid{Bucket: bucket, Object: prefix})
-	}
-	// Verify if delimiter is anything other than '/', which we do not support.
-	if delimiter != "" && delimiter != slashSeparator {
-		return ListObjectsInfo{}, traceError(UnsupportedDelimiter{
-			Delimiter: delimiter,
-		})
-	}
-	// Verify if marker has prefix.
-	if marker != "" {
-		if !strings.HasPrefix(marker, prefix) {
-			return ListObjectsInfo{}, traceError(InvalidMarkerPrefixCombination{
-				Marker: marker,
-				Prefix: prefix,
-			})
-		}
+	if err := checkListObjsArgs(bucket, prefix, marker, delimiter, xl); err != nil {
+		return ListObjectsInfo{}, err
 	}
 
 	// With max keys of zero we have reached eof, return right here.

cmd/xl-v1-list-objects.go

@@ -100,31 +100,8 @@ func (xl xlObjects) listObjects(bucket, prefix, marker, delimiter string, maxKey
 
 // ListObjects - list all objects at prefix, delimited by '/'.
 func (xl xlObjects) ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ListObjectsInfo{}, traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify if bucket exists.
-	if !xl.isBucketExist(bucket) {
-		return ListObjectsInfo{}, traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectPrefix(prefix) {
-		return ListObjectsInfo{}, traceError(ObjectNameInvalid{Bucket: bucket, Object: prefix})
-	}
-	// Verify if delimiter is anything other than '/', which we do not support.
-	if delimiter != "" && delimiter != slashSeparator {
-		return ListObjectsInfo{}, traceError(UnsupportedDelimiter{
-			Delimiter: delimiter,
-		})
-	}
-	// Verify if marker has prefix.
-	if marker != "" {
-		if !strings.HasPrefix(marker, prefix) {
-			return ListObjectsInfo{}, traceError(InvalidMarkerPrefixCombination{
-				Marker: marker,
-				Prefix: prefix,
-			})
-		}
+	if err := checkListObjsArgs(bucket, prefix, marker, delimiter, xl); err != nil {
+		return ListObjectsInfo{}, err
 	}
 
 	// With max keys of zero we have reached eof, return right here.

cmd/xl-v1-multipart.go

@@ -29,7 +29,6 @@ import (
 	"time"
 
 	"github.com/minio/minio/pkg/mimedb"
-	"github.com/skyrings/skyring-common/tools/uuid"
 )
 
 // listMultipartUploads - lists all multipart uploads.
@@ -210,48 +209,10 @@ func (xl xlObjects) listMultipartUploads(bucket, prefix, keyMarker, uploadIDMark
 // ListMultipartsInfo structure is unmarshalled directly into XML and
 // replied back to the client.
 func (xl xlObjects) ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
-	result := ListMultipartsInfo{}
+	if err := checkListMultipartArgs(bucket, prefix, keyMarker, uploadIDMarker, delimiter, xl); err != nil {
+		return ListMultipartsInfo{}, err
+	}
 
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ListMultipartsInfo{}, traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	if !xl.isBucketExist(bucket) {
-		return ListMultipartsInfo{}, traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectPrefix(prefix) {
-		return ListMultipartsInfo{}, traceError(ObjectNameInvalid{Bucket: bucket, Object: prefix})
-	}
-	// Verify if delimiter is anything other than '/', which we do not support.
-	if delimiter != "" && delimiter != slashSeparator {
-		return ListMultipartsInfo{}, traceError(UnsupportedDelimiter{
-			Delimiter: delimiter,
-		})
-	}
-	// Verify if marker has prefix.
-	if keyMarker != "" && !strings.HasPrefix(keyMarker, prefix) {
-		return ListMultipartsInfo{}, traceError(InvalidMarkerPrefixCombination{
-			Marker: keyMarker,
-			Prefix: prefix,
-		})
-	}
-	if uploadIDMarker != "" {
-		if strings.HasSuffix(keyMarker, slashSeparator) {
-			return result, traceError(InvalidUploadIDKeyCombination{
-				UploadIDMarker: uploadIDMarker,
-				KeyMarker:      keyMarker,
-			})
-		}
-		id, err := uuid.Parse(uploadIDMarker)
-		if err != nil {
-			return result, traceError(err)
-		}
-		if id.IsZero() {
-			return result, traceError(MalformedUploadID{
-				UploadID: uploadIDMarker,
-			})
-		}
-	}
 	return xl.listMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter, maxUploads)
 }
 
@@ -319,17 +280,8 @@ func (xl xlObjects) newMultipartUpload(bucket string, object string, meta map[st
 //
 // Implements S3 compatible initiate multipart API.
 func (xl xlObjects) NewMultipartUpload(bucket, object string, meta map[string]string) (string, error) {
-	// Verify if bucket name is valid.
-	if !IsValidBucketName(bucket) {
-		return "", traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify whether the bucket exists.
-	if !xl.isBucketExist(bucket) {
-		return "", traceError(BucketNotFound{Bucket: bucket})
-	}
-	// Verify if object name is valid.
-	if !IsValidObjectName(object) {
-		return "", traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkNewMultipartArgs(bucket, object, xl); err != nil {
+		return "", err
 	}
 	// No metadata is set, allocate a new one.
 	if meta == nil {
@@ -344,16 +296,8 @@ func (xl xlObjects) NewMultipartUpload(bucket, object string, meta map[string]st
 //
 // Implements S3 compatible Upload Part API.
 func (xl xlObjects) PutObjectPart(bucket, object, uploadID string, partID int, size int64, data io.Reader, md5Hex string, sha256sum string) (string, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return "", traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify whether the bucket exists.
-	if !xl.isBucketExist(bucket) {
-		return "", traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return "", traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkPutObjectPartArgs(bucket, object, xl); err != nil {
+		return "", err
 	}
 
 	var partsMetadata []xlMetaV1
@@ -607,16 +551,8 @@ func (xl xlObjects) listObjectParts(bucket, object, uploadID string, partNumberM
 // ListPartsInfo structure is unmarshalled directly into XML and
 // replied back to the client.
 func (xl xlObjects) ListObjectParts(bucket, object, uploadID string, partNumberMarker, maxParts int) (ListPartsInfo, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ListPartsInfo{}, traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify whether the bucket exists.
-	if !xl.isBucketExist(bucket) {
-		return ListPartsInfo{}, traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return ListPartsInfo{}, traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkListPartsArgs(bucket, object, xl); err != nil {
+		return ListPartsInfo{}, err
 	}
 
 	// Hold lock so that there is no competing
@@ -640,19 +576,8 @@ func (xl xlObjects) ListObjectParts(bucket, object, uploadID string, partNumberM
 //
 // Implements S3 compatible Complete multipart API.
 func (xl xlObjects) CompleteMultipartUpload(bucket string, object string, uploadID string, parts []completePart) (string, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return "", traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify whether the bucket exists.
-	if !xl.isBucketExist(bucket) {
-		return "", traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return "", traceError(ObjectNameInvalid{
-			Bucket: bucket,
-			Object: object,
-		})
+	if err := checkCompleteMultipartArgs(bucket, object, xl); err != nil {
+		return "", err
 	}
 
 	// Hold lock so that
@@ -884,15 +809,8 @@ func (xl xlObjects) abortMultipartUpload(bucket, object, uploadID string) (err e
 // that this is an atomic idempotent operation. Subsequent calls have
 // no affect and further requests to the same uploadID would not be honored.
 func (xl xlObjects) AbortMultipartUpload(bucket, object, uploadID string) error {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	if !xl.isBucketExist(bucket) {
-		return traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkAbortMultipartArgs(bucket, object, xl); err != nil {
+		return err
 	}
 
 	// Hold lock so that there is no competing

cmd/xl-v1-object.go

@@ -50,13 +50,8 @@ var objectOpIgnoredErrs = []error{
 // object to be read at. length indicates the total length of the
 // object requested by client.
 func (xl xlObjects) GetObject(bucket, object string, startOffset int64, length int64, writer io.Writer) error {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify if object is valid.
-	if !IsValidObjectName(object) {
-		return traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err := checkGetObjArgs(bucket, object); err != nil {
+		return err
 	}
 	// Start offset and length cannot be negative.
 	if startOffset < 0 || length < 0 {
@@ -223,13 +218,8 @@ func (xl xlObjects) GetObject(bucket, object string, startOffset int64, length i
 
 // GetObjectInfo - reads object metadata and replies back ObjectInfo.
 func (xl xlObjects) GetObjectInfo(bucket, object string) (ObjectInfo, error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ObjectInfo{}, BucketNameInvalid{Bucket: bucket}
-	}
-	// Verify if object is valid.
-	if !IsValidObjectName(object) {
-		return ObjectInfo{}, ObjectNameInvalid{Bucket: bucket, Object: object}
+	if err := checkGetObjArgs(bucket, object); err != nil {
+		return ObjectInfo{}, err
 	}
 
 	objectLock := nsMutex.NewNSLock(bucket, object)
@@ -365,19 +355,8 @@ func renameObject(disks []StorageAPI, srcBucket, srcObject, dstBucket, dstObject
 // writes `xl.json` which carries the necessary metadata for future
 // object operations.
 func (xl xlObjects) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string, sha256sum string) (objInfo ObjectInfo, err error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return ObjectInfo{}, traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	// Verify bucket exists.
-	if !xl.isBucketExist(bucket) {
-		return ObjectInfo{}, traceError(BucketNotFound{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return ObjectInfo{}, traceError(ObjectNameInvalid{
-			Bucket: bucket,
-			Object: object,
-		})
+	if err = checkPutObjectArgs(bucket, object, xl); err != nil {
+		return ObjectInfo{}, err
 	}
 	// No metadata is set, allocate a new one.
 	if metadata == nil {
@@ -623,12 +602,8 @@ func (xl xlObjects) deleteObject(bucket, object string) error {
 // any error as it is not necessary for the handler to reply back a
 // response to the client request.
 func (xl xlObjects) DeleteObject(bucket, object string) (err error) {
-	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		return traceError(BucketNameInvalid{Bucket: bucket})
-	}
-	if !IsValidObjectName(object) {
-		return traceError(ObjectNameInvalid{Bucket: bucket, Object: object})
+	if err = checkDelObjArgs(bucket, object); err != nil {
+		return err
 	}
 
 	objectLock := nsMutex.NewNSLock(bucket, object)