[#121] client: Make PrmSessionCreate fields public

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

client/session.go

@@ -16,30 +16,32 @@ import (
 
 // PrmSessionCreate groups parameters of SessionCreate operation.
 type PrmSessionCreate struct {
-	prmCommonMeta
+	XHeaders []string
 
-	exp uint64
+	Expiration uint64
 
-	keySet bool
-	key    ecdsa.PrivateKey
+	Key *ecdsa.PrivateKey
 }
 
 // SetExp sets number of the last NepFS epoch in the lifetime of the session after which it will be expired.
+//
+// Deprecated: Use PrmSessionCreate.Expiration instead.
 func (x *PrmSessionCreate) SetExp(exp uint64) {
-	x.exp = exp
+	x.Expiration = exp
 }
 
 // UseKey specifies private key to sign the requests and compute token owner.
 // If key is not provided, then Client default key is used.
+//
+// Deprecated: Use PrmSessionCreate.Key instead.
 func (x *PrmSessionCreate) UseKey(key ecdsa.PrivateKey) {
-	x.keySet = true
-	x.key = key
+	x.Key = &key
 }
 
 func (x *PrmSessionCreate) buildRequest(c *Client) (*v2session.CreateRequest, error) {
 	ownerKey := c.prm.key.PublicKey
-	if x.keySet {
-		ownerKey = x.key.PublicKey
+	if x.Key != nil {
+		ownerKey = x.Key.PublicKey
 	}
 	var ownerID user.ID
 	user.IDFromKey(&ownerID, ownerKey)
@@ -49,10 +51,10 @@ func (x *PrmSessionCreate) buildRequest(c *Client) (*v2session.CreateRequest, er
 
 	reqBody := new(v2session.CreateRequestBody)
 	reqBody.SetOwnerID(&ownerIDV2)
-	reqBody.SetExpiration(x.exp)
+	reqBody.SetExpiration(x.Expiration)
 
 	var meta v2session.RequestMetaHeader
-	writeXHeadersToMeta(x.xHeaders, &meta)
+	writeXHeadersToMeta(x.XHeaders, &meta)
 
 	var req v2session.CreateRequest
 	req.SetBody(reqBody)