frostfs-s3-gw/api/layer/util.go

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package layer
import (
"net/http"
"os"
"strconv"
"strings"
"time"
"github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-api-go/pkg/owner"
)
type (
// ObjectInfo holds S3 object data.
ObjectInfo struct {
id *object.ID
isDir bool
Bucket string
Name string
Size int64
ContentType string
Created time.Time
HashSum string
Owner *owner.ID
Headers map[string]string
}
// ListObjectsInfo - container for list objects.
ListObjectsInfo struct {
// Indicates whether the returned list objects response is truncated. A
// value of true indicates that the list was truncated. The list can be truncated
// if the number of objects exceeds the limit allowed or specified
// by max keys.
IsTruncated bool
// When response is truncated (the IsTruncated element value in the response
// is true), you can use the key name in this field as marker in the subsequent
// request to get next set of objects.
//
// NOTE: This element is returned only if you have delimiter request parameter
// specified.
ContinuationToken string
NextContinuationToken string
// When response is truncated (the IsTruncated element value in the response is true),
// you can use the key name in this field as marker in the subsequent request to get next set of objects.
NextMarker string
// List of objects info for this request.
Objects []*ObjectInfo
// List of prefixes for this request.
Prefixes []string
}
)
// PathSeparator is a path components separator string.
const PathSeparator = string(os.PathSeparator)
func userHeaders(attrs []*object.Attribute) map[string]string {
result := make(map[string]string, len(attrs))
for _, attr := range attrs {
result[attr.Key()] = attr.Value()
}
return result
}
func objectInfoFromMeta(bkt *BucketInfo, meta *object.Object, prefix, delimiter string) *ObjectInfo {
var (
isDir bool
size int64
mimeType string
creation time.Time
filename = filenameFromObject(meta)
)
if !strings.HasPrefix(filename, prefix) {
return nil
}
userHeaders := userHeaders(meta.Attributes())
delete(userHeaders, object.AttributeFileName)
if contentType, ok := userHeaders[object.AttributeContentType]; ok {
mimeType = contentType
delete(userHeaders, object.AttributeContentType)
}
if val, ok := userHeaders[object.AttributeTimestamp]; !ok {
// ignore empty value
} else if dt, err := strconv.ParseInt(val, 10, 64); err == nil {
creation = time.Unix(dt, 0)
delete(userHeaders, object.AttributeTimestamp)
}
if len(delimiter) > 0 {
tail := strings.TrimPrefix(filename, prefix)
index := strings.Index(tail, delimiter)
if index >= 0 {
isDir = true
filename = prefix + tail[:index+1]
userHeaders = nil
} else {
size, mimeType = getSizeAndMimeType(meta, mimeType)
}
} else {
size, mimeType = getSizeAndMimeType(meta, mimeType)
}
return &ObjectInfo{
id: meta.ID(),
isDir: isDir,
Bucket: bkt.Name,
Name: filename,
Created: creation,
ContentType: mimeType,
Headers: userHeaders,
Owner: meta.OwnerID(),
Size: size,
HashSum: meta.PayloadChecksum().String(),
}
}
func getSizeAndMimeType(meta *object.Object, contentType string) (size int64, mimeType string) {
size = int64(meta.PayloadSize())
mimeType = contentType
if len(mimeType) == 0 {
mimeType = http.DetectContentType(meta.Payload())
}
return
}
func filenameFromObject(o *object.Object) string {
var name = o.ID().String()
for _, attr := range o.Attributes() {
if attr.Key() == object.AttributeFileName {
return attr.Value()
}
}
return name
}
// NameFromString splits name into base file name and directory path.
func NameFromString(name string) (string, string) {
ind := strings.LastIndex(name, PathSeparator)
return name[ind+1:], name[:ind+1]
}
// ID returns object ID from ObjectInfo.
func (o *ObjectInfo) ID() *object.ID { return o.id }
// IsDir allows to check if object is a directory.
func (o *ObjectInfo) IsDir() bool { return o.isDir }