[#121] client: Make PrmObjectHash fields public

* Introduce buildRequest for PrmObjectHash

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

client/object_hash.go

@@ -13,121 +13,53 @@ import (
 	v2session "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/session"
 	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/signature"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/checksum"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
 )
 
 // PrmObjectHash groups parameters of ObjectHash operation.
 type PrmObjectHash struct {
-	meta v2session.RequestMetaHeader
+	XHeaders []string
 
-	body v2object.GetRangeHashRequestBody
+	BearerToken *bearer.Token
 
-	csAlgo v2refs.ChecksumType
+	Session *session.Object
 
-	addr v2refs.Address
+	Local bool
 
-	keySet bool
-	key    ecdsa.PrivateKey
+	Ranges []object.Range
+
+	Salt []byte
+
+	ChecksumType checksum.Type
+
+	ContainerID *cid.ID
+
+	ObjectID *oid.ID
+
+	Key *ecdsa.PrivateKey
 }
 
 // UseKey specifies private key to sign the requests.
 // If key is not provided, then Client default key is used.
-func (x *PrmObjectHash) UseKey(key ecdsa.PrivateKey) {
-	x.keySet = true
-	x.key = key
-}
-
-// MarkLocal tells the server to execute the operation locally.
-func (x *PrmObjectHash) MarkLocal() {
-	x.meta.SetTTL(1)
-}
-
-// WithinSession specifies session within which object should be read.
 //
-// Creator of the session acquires the authorship of the request.
-// This may affect the execution of an operation (e.g. access control).
-//
-// Must be signed.
-func (x *PrmObjectHash) WithinSession(t session.Object) {
-	var tv2 v2session.Token
-	t.WriteToV2(&tv2)
-
-	x.meta.SetSessionToken(&tv2)
-}
-
-// WithBearerToken attaches bearer token to be used for the operation.
-//
-// If set, underlying eACL rules will be used in access control.
-//
-// Must be signed.
-func (x *PrmObjectHash) WithBearerToken(t bearer.Token) {
-	var v2token acl.BearerToken
-	t.WriteToV2(&v2token)
-	x.meta.SetBearerToken(&v2token)
-}
-
-// FromContainer specifies FrostFS container of the object.
-// Required parameter.
-func (x *PrmObjectHash) FromContainer(id cid.ID) {
-	var cidV2 v2refs.ContainerID
-	id.WriteToV2(&cidV2)
-
-	x.addr.SetContainerID(&cidV2)
-}
-
-// ByID specifies identifier of the requested object.
-// Required parameter.
-func (x *PrmObjectHash) ByID(id oid.ID) {
-	var idV2 v2refs.ObjectID
-	id.WriteToV2(&idV2)
-
-	x.addr.SetObjectID(&idV2)
-}
-
-// SetRangeList sets list of ranges in (offset, length) pair format.
-// Required parameter.
-//
-// If passed as slice, then it must not be mutated before the operation completes.
-func (x *PrmObjectHash) SetRangeList(r ...uint64) {
-	ln := len(r)
-	if ln%2 != 0 {
-		panic("odd number of range parameters")
-	}
-
-	rs := make([]v2object.Range, ln/2)
-
-	for i := 0; i < ln/2; i++ {
-		rs[i].SetOffset(r[2*i])
-		rs[i].SetLength(r[2*i+1])
-	}
-
-	x.body.SetRanges(rs)
+// Deprecated: Use PrmObjectHash.Key instead.
+func (prm *PrmObjectHash) UseKey(key ecdsa.PrivateKey) {
+	prm.Key = &key
 }
 
 // TillichZemorAlgo changes the hash function to Tillich-Zemor
 // (https://link.springer.com/content/pdf/10.1007/3-540-48658-5_5.pdf).
 //
-// By default, SHA256 hash function is used.
-func (x *PrmObjectHash) TillichZemorAlgo() {
-	x.csAlgo = v2refs.TillichZemor
-}
-
-// UseSalt sets the salt to XOR the data range before hashing.
+// By default, SHA256 hash function is used/.
 //
-// Must not be mutated before the operation completes.
-func (x *PrmObjectHash) UseSalt(salt []byte) {
-	x.body.SetSalt(salt)
-}
-
-// WithXHeaders specifies list of extended headers (string key-value pairs)
-// to be attached to the request. Must have an even length.
-//
-// Slice must not be mutated until the operation completes.
-func (x *PrmObjectHash) WithXHeaders(hs ...string) {
-	writeXHeadersToMeta(hs, &x.meta)
+// Deprecated: Use PrmObjectHash.ChecksumType instead.
+func (prm *PrmObjectHash) TillichZemorAlgo() {
+	prm.ChecksumType = checksum.TZ
 }
 
 // ResObjectHash groups resulting values of ObjectHash operation.
@@ -142,6 +74,76 @@ func (x ResObjectHash) Checksums() [][]byte {
 	return x.checksums
 }
 
+func (prm *PrmObjectHash) buildRequest(c *Client) (*v2object.GetRangeHashRequest, error) {
+	if prm.ContainerID == nil {
+		return nil, errorMissingContainer
+	}
+
+	if prm.ObjectID == nil {
+		return nil, errorMissingObject
+	}
+
+	if len(prm.XHeaders)%2 != 0 {
+		return nil, errorInvalidXHeaders
+	}
+
+	if len(prm.Ranges) == 0 {
+		return nil, errorMissingRanges
+	}
+
+	meta := new(v2session.RequestMetaHeader)
+	writeXHeadersToMeta(prm.XHeaders, meta)
+
+	if prm.BearerToken != nil {
+		v2BearerToken := new(acl.BearerToken)
+		prm.BearerToken.WriteToV2(v2BearerToken)
+		meta.SetBearerToken(v2BearerToken)
+	}
+
+	if prm.Session != nil {
+		v2SessionToken := new(v2session.Token)
+		prm.Session.WriteToV2(v2SessionToken)
+		meta.SetSessionToken(v2SessionToken)
+	}
+
+	if prm.Local {
+		meta.SetTTL(1)
+	}
+
+	addr := new(v2refs.Address)
+
+	cnrV2 := new(v2refs.ContainerID)
+	prm.ContainerID.WriteToV2(cnrV2)
+	addr.SetContainerID(cnrV2)
+
+	objV2 := new(v2refs.ObjectID)
+	prm.ObjectID.WriteToV2(objV2)
+	addr.SetObjectID(objV2)
+
+	rs := make([]v2object.Range, len(prm.Ranges))
+	for i := range prm.Ranges {
+		rs[i].SetOffset(prm.Ranges[i].GetOffset())
+		rs[i].SetLength(prm.Ranges[i].GetLength())
+	}
+
+	body := new(v2object.GetRangeHashRequestBody)
+	body.SetAddress(addr)
+	body.SetRanges(rs)
+	body.SetSalt(prm.Salt)
+
+	if prm.ChecksumType == checksum.Unknown {
+		body.SetType(v2refs.SHA256)
+	} else {
+		body.SetType(v2refs.ChecksumType(prm.ChecksumType))
+	}
+
+	req := new(v2object.GetRangeHashRequest)
+	req.SetBody(body)
+	c.prepareRequest(req, meta)
+
+	return req, nil
+}
+
 // ObjectHash requests checksum of the range list of the object payload using
 // FrostFS API protocol.
 //
@@ -165,37 +167,22 @@ func (x ResObjectHash) Checksums() [][]byte {
 //   - *apistatus.ObjectOutOfRange;
 //   - *apistatus.SessionTokenExpired.
 func (c *Client) ObjectHash(ctx context.Context, prm PrmObjectHash) (*ResObjectHash, error) {
-	switch {
-	case prm.addr.GetContainerID() == nil:
-		return nil, errorMissingContainer
-	case prm.addr.GetObjectID() == nil:
-		return nil, errorMissingObject
-	case len(prm.body.GetRanges()) == 0:
-		return nil, errorMissingRanges
+	req, err := prm.buildRequest(c)
+	if err != nil {
+		return nil, err
 	}
 
-	prm.body.SetAddress(&prm.addr)
-	if prm.csAlgo == v2refs.UnknownChecksum {
-		prm.body.SetType(v2refs.SHA256)
-	} else {
-		prm.body.SetType(prm.csAlgo)
-	}
-
-	var req v2object.GetRangeHashRequest
-	c.prepareRequest(&req, &prm.meta)
-	req.SetBody(&prm.body)
-
 	key := c.prm.key
-	if prm.keySet {
-		key = prm.key
+	if prm.Key != nil {
+		key = *prm.Key
 	}
 
-	err := signature.SignServiceMessage(&key, &req)
+	err = signature.SignServiceMessage(&key, req)
 	if err != nil {
 		return nil, fmt.Errorf("sign request: %w", err)
 	}
 
-	resp, err := rpcapi.HashObjectRange(&c.c, &req, client.WithContext(ctx))
+	resp, err := rpcapi.HashObjectRange(&c.c, req, client.WithContext(ctx))
 	if err != nil {
 		return nil, fmt.Errorf("write request: %w", err)
 	}