frostfs-s3-gw/api/handler/response.go

package handler

import "encoding/xml"

// ListBucketsResponse - format for list buckets response.
type ListBucketsResponse struct {
	XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ ListAllMyBucketsResult" json:"-"`

	Owner Owner

	// Container for one or more buckets.
	Buckets struct {
		Buckets []Bucket `xml:"Bucket"`
	} // Buckets are nested
}

// ListObjectsV2Response - format for list objects response.
type ListObjectsV2Response struct {
	XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ ListBucketResult" json:"-"`

	Name       string
	Prefix     string
	StartAfter string `xml:"StartAfter,omitempty"`
	// 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. Server lists objects in alphabetical
	// order Note: This element is returned only if you have delimiter request parameter
	// specified. If response does not include the NextMaker and it is truncated,
	// you can use the value of the last Key in the response as the marker in the
	// subsequent request to get the next set of object keys.
	ContinuationToken     string `xml:"ContinuationToken,omitempty"`
	NextContinuationToken string `xml:"NextContinuationToken,omitempty"`

	KeyCount  int
	MaxKeys   int
	Delimiter string
	// A flag that indicates whether or not ListObjects returned all of the results
	// that satisfied the search criteria.
	IsTruncated bool

	Contents       []Object
	CommonPrefixes []CommonPrefix

	// Encoding type used to encode object keys in the response.
	EncodingType string `xml:"EncodingType,omitempty"`
}

// Bucket container for bucket metadata.
type Bucket struct {
	Name         string
	CreationDate string // time string of format "2006-01-02T15:04:05.000Z"
}

// Owner - bucket owner/principal.
type Owner struct {
	ID          string
	DisplayName string
}

// ListObjectsResponse - format for list objects response.
type ListObjectsResponse struct {
	XMLName xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ ListBucketResult" json:"-"`

	Name   string
	Prefix string
	Marker 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. Server lists objects in alphabetical
	// order Note: This element is returned only if you have delimiter request parameter
	// specified. If response does not include the NextMaker and it is truncated,
	// you can use the value of the last Key in the response as the marker in the
	// subsequent request to get the next set of object keys.
	NextMarker string `xml:"NextMarker,omitempty"`

	MaxKeys   int
	Delimiter string
	// A flag that indicates whether or not ListObjects returned all of the results
	// that satisfied the search criteria.
	IsTruncated bool

	Contents       []Object
	CommonPrefixes []CommonPrefix

	// Encoding type used to encode object keys in the response.
	EncodingType string `xml:"EncodingType,omitempty"`
}

// CommonPrefix container for prefix response in ListObjectsResponse.
type CommonPrefix struct {
	Prefix string
}

// Object container for object metadata.
type Object struct {
	Key          string
	LastModified string // time string of format "2006-01-02T15:04:05.000Z"
	ETag         string `xml:"ETag,omitempty"`
	Size         int64

	// Owner of the object.
	Owner Owner

	// The class of storage used to store the object.
	StorageClass string `xml:"StorageClass,omitempty"`

	// UserMetadata user-defined metadata
	UserMetadata StringMap `xml:"UserMetadata,omitempty"`
}

// StringMap is a map[string]string.
type StringMap map[string]string

// LocationResponse - format for location response.
type LocationResponse struct {
	XMLName  xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ LocationConstraint" json:"-"`
	Location string   `xml:",chardata"`
}

// CopyObjectResponse container returns ETag and LastModified of the successfully copied object.
type CopyObjectResponse struct {
	XMLName      xml.Name `xml:"http://s3.amazonaws.com/doc/2006-03-01/ CopyObjectResult" json:"-"`
	LastModified string   // time string of format "2006-01-02T15:04:05.000Z"
	ETag         string   // md5sum of the copied object.
}

// MarshalXML - StringMap marshals into XML.
func (s StringMap) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	tokens := []xml.Token{start}

	for key, value := range s {
		t := xml.StartElement{}
		t.Name = xml.Name{
			Space: "",
			Local: key,
		}
		tokens = append(tokens, t, xml.CharData(value), xml.EndElement{Name: t.Name})
	}

	tokens = append(tokens, xml.EndElement{
		Name: start.Name,
	})

	for _, t := range tokens {
		if err := e.EncodeToken(t); err != nil {
			return err
		}
	}

	// flush to ensure tokens are written
	return e.Flush()
}