fs mode: List already existing buckets with capital letters (#7244)

if a bucket with `Captialized letters` is created, `InvalidBucketName` error
will be returned. 
In the case of pre-existing buckets, it will be listed.

Fixes #6938

cmd/fs-v1.go

@@ -30,6 +30,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/minio/minio-go/pkg/s3utils"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/lock"
 	"github.com/minio/minio/pkg/madmin"
@@ -289,10 +290,8 @@ func (fs *FSObjects) MakeBucketWithLocation(ctx context.Context, bucket, locatio
 	}
 	defer bucketLock.Unlock()
 	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		err := BucketNameInvalid{Bucket: bucket}
-		logger.LogIf(ctx, err)
-		return err
+	if s3utils.CheckValidBucketNameStrict(bucket) != nil {
+		return BucketNameInvalid{Bucket: bucket}
 	}
 	bucketDir, err := fs.getBucketDir(ctx, bucket)
 	if err != nil {
@@ -341,7 +340,7 @@ func (fs *FSObjects) ListBuckets(ctx context.Context) ([]BucketInfo, error) {
 
 	for _, entry := range entries {
 		// Ignore all reserved bucket names and invalid bucket names.
-		if isReservedOrInvalidBucket(entry) {
+		if isReservedOrInvalidBucket(entry, false) {
 			continue
 		}
 		var fi os.FileInfo

cmd/gateway/oss/gateway-oss.go

@@ -30,6 +30,7 @@ import (
 
 	"github.com/minio/cli"
 	miniogopolicy "github.com/minio/minio-go/pkg/policy"
+	"github.com/minio/minio-go/pkg/s3utils"
 	minio "github.com/minio/minio/cmd"
 	xhttp "github.com/minio/minio/cmd/http"
 	"github.com/minio/minio/cmd/logger"
@@ -349,7 +350,7 @@ func ossIsValidBucketName(bucket string) bool {
 	if strings.Contains(bucket, ".") {
 		return false
 	}
-	if !minio.IsValidBucketName(bucket) {
+	if s3utils.CheckValidBucketNameStrict(bucket) != nil {
 		return false
 	}
 	return true

cmd/object-api-utils.go

@@ -34,6 +34,7 @@ import (
 	"unicode/utf8"
 
 	snappy "github.com/golang/snappy"
+	"github.com/minio/minio-go/pkg/s3utils"
 	"github.com/minio/minio/cmd/crypto"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/dns"
@@ -273,10 +274,16 @@ func isStringEqual(s1 string, s2 string) bool {
 }
 
 // Ignores all reserved bucket names or invalid bucket names.
-func isReservedOrInvalidBucket(bucketEntry string) bool {
+func isReservedOrInvalidBucket(bucketEntry string, strict bool) bool {
 	bucketEntry = strings.TrimSuffix(bucketEntry, slashSeparator)
-	if !IsValidBucketName(bucketEntry) {
-		return true
+	if strict {
+		if err := s3utils.CheckValidBucketNameStrict(bucketEntry); err != nil {
+			return true
+		}
+	} else {
+		if err := s3utils.CheckValidBucketName(bucketEntry); err != nil {
+			return true
+		}
 	}
 	return isMinioMetaBucket(bucketEntry) || isMinioReservedBucket(bucketEntry)
 }

cmd/web-handlers.go

@@ -157,7 +157,7 @@ func (web *webAPIHandlers) MakeBucket(r *http.Request, args *MakeBucketArgs, rep
 	}
 
 	// Check if bucket is a reserved bucket name or invalid.
-	if isReservedOrInvalidBucket(args.BucketName) {
+	if isReservedOrInvalidBucket(args.BucketName, true) {
 		return toJSONError(errInvalidBucketName)
 	}
 

cmd/xl-v1-bucket.go

@@ -21,6 +21,7 @@ import (
 	"sort"
 	"sync"
 
+	"github.com/minio/minio-go/pkg/s3utils"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/policy"
 )
@@ -36,8 +37,7 @@ var bucketMetadataOpIgnoredErrs = append(bucketOpIgnoredErrs, errVolumeNotFound)
 // MakeBucket - make a bucket.
 func (xl xlObjects) MakeBucketWithLocation(ctx context.Context, bucket, location string) error {
 	// Verify if bucket is valid.
-	if !IsValidBucketName(bucket) {
-		logger.LogIf(ctx, BucketNameInvalid{Bucket: bucket})
+	if err := s3utils.CheckValidBucketNameStrict(bucket); err != nil {
 		return BucketNameInvalid{Bucket: bucket}
 	}
 
@@ -178,7 +178,7 @@ func (xl xlObjects) listBuckets(ctx context.Context) (bucketsInfo []BucketInfo,
 			// should take care of this.
 			var bucketsInfo []BucketInfo
 			for _, volInfo := range volsInfo {
-				if isReservedOrInvalidBucket(volInfo.Name) {
+				if isReservedOrInvalidBucket(volInfo.Name, true) {
 					continue
 				}
 				bucketsInfo = append(bucketsInfo, BucketInfo(volInfo))