[#131] client: Re-implement Object.Head method

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

client/object.go

@@ -32,14 +32,6 @@ type DeleteObjectParams struct {
 	tombTgt ObjectAddressWriter
 }
 
-type ObjectHeaderParams struct {
-	addr *address.Address
-
-	raw bool
-
-	short bool
-}
-
 type RangeDataParams struct {
 	addr *address.Address
 
@@ -251,190 +243,6 @@ func writeUnexpectedMessageTypeErr(res resCommon, val interface{}) {
 	res.setStatus(st)
 }
 
-func (p *ObjectHeaderParams) WithAddress(v *address.Address) *ObjectHeaderParams {
-	if p != nil {
-		p.addr = v
-	}
-
-	return p
-}
-
-func (p *ObjectHeaderParams) Address() *address.Address {
-	if p != nil {
-		return p.addr
-	}
-
-	return nil
-}
-
-func (p *ObjectHeaderParams) WithAllFields() *ObjectHeaderParams {
-	if p != nil {
-		p.short = false
-	}
-
-	return p
-}
-
-// AllFields return true if parameter set to return all header fields, returns
-// false if parameter set to return only main fields of header.
-func (p *ObjectHeaderParams) AllFields() bool {
-	if p != nil {
-		return !p.short
-	}
-
-	return false
-}
-
-func (p *ObjectHeaderParams) WithMainFields() *ObjectHeaderParams {
-	if p != nil {
-		p.short = true
-	}
-
-	return p
-}
-
-func (p *ObjectHeaderParams) WithRawFlag(v bool) *ObjectHeaderParams {
-	if p != nil {
-		p.raw = v
-	}
-
-	return p
-}
-
-func (p *ObjectHeaderParams) RawFlag() bool {
-	if p != nil {
-		return p.raw
-	}
-
-	return false
-}
-
-type ObjectHeadRes struct {
-	statusRes
-	objectRes
-}
-
-// HeadObject receives object's header through NeoFS API call.
-//
-// Any client's internal or transport errors are returned as `error`.
-// If WithNeoFSErrorParsing option has been provided, unsuccessful
-// NeoFS status codes are returned as `error`, otherwise, are included
-// in the returned result structure.
-func (c *Client) HeadObject(ctx context.Context, p *ObjectHeaderParams, opts ...CallOption) (*ObjectHeadRes, error) {
-	callOpts := c.defaultCallOptions()
-
-	for i := range opts {
-		if opts[i] != nil {
-			opts[i](callOpts)
-		}
-	}
-
-	// create request
-	req := new(v2object.HeadRequest)
-
-	// initialize request body
-	body := new(v2object.HeadRequestBody)
-	req.SetBody(body)
-
-	// set meta header
-	meta := v2MetaHeaderFromOpts(callOpts)
-
-	if err := c.attachV2SessionToken(callOpts, meta, v2SessionReqInfo{
-		addr: p.addr.ToV2(),
-		verb: v2session.ObjectVerbHead,
-	}); err != nil {
-		return nil, fmt.Errorf("could not attach session token: %w", err)
-	}
-
-	req.SetMetaHeader(meta)
-
-	// fill body fields
-	body.SetAddress(p.addr.ToV2())
-	body.SetMainOnly(p.short)
-	body.SetRaw(p.raw)
-
-	// sign the request
-	if err := signature.SignServiceMessage(callOpts.key, req); err != nil {
-		return nil, fmt.Errorf("signing the request failed: %w", err)
-	}
-
-	// send Head request
-	resp, err := rpcapi.HeadObject(c.Raw(), req, client.WithContext(ctx))
-	if err != nil {
-		return nil, fmt.Errorf("sending the request failed: %w", err)
-	}
-
-	var (
-		res     = new(ObjectHeadRes)
-		procPrm processResponseV2Prm
-		procRes processResponseV2Res
-	)
-
-	procPrm.callOpts = callOpts
-	procPrm.resp = resp
-
-	procRes.statusRes = res
-
-	// process response in general
-	if c.processResponseV2(&procRes, procPrm) {
-		if procRes.cliErr != nil {
-			return nil, procRes.cliErr
-		}
-
-		return res, nil
-	}
-
-	var (
-		hdr   *v2object.Header
-		idSig *v2refs.Signature
-	)
-
-	switch v := resp.GetBody().GetHeaderPart().(type) {
-	case nil:
-		writeUnexpectedMessageTypeErr(res, v)
-		return res, nil
-	case *v2object.ShortHeader:
-		if !p.short {
-			writeUnexpectedMessageTypeErr(res, v)
-			return res, nil
-		}
-
-		h := v
-
-		hdr = new(v2object.Header)
-		hdr.SetPayloadLength(h.GetPayloadLength())
-		hdr.SetVersion(h.GetVersion())
-		hdr.SetOwnerID(h.GetOwnerID())
-		hdr.SetObjectType(h.GetObjectType())
-		hdr.SetCreationEpoch(h.GetCreationEpoch())
-		hdr.SetPayloadHash(h.GetPayloadHash())
-		hdr.SetHomomorphicHash(h.GetHomomorphicHash())
-	case *v2object.HeaderWithSignature:
-		if p.short {
-			writeUnexpectedMessageTypeErr(res, v)
-			return res, nil
-		}
-
-		hdr = v.GetHeader()
-		idSig = v.GetSignature()
-	case *v2object.SplitInfo:
-		si := object.NewSplitInfoFromV2(v)
-
-		return nil, object.NewSplitInfoError(si)
-	}
-
-	obj := new(v2object.Object)
-	obj.SetHeader(hdr)
-	obj.SetSignature(idSig)
-
-	raw := object.NewRawFromV2(obj)
-	raw.SetID(p.addr.ObjectID())
-
-	res.setObject(raw.Object())
-
-	return res, nil
-}
-
 func (p *RangeDataParams) WithAddress(v *address.Address) *RangeDataParams {
 	if p != nil {
 		p.addr = v