[#58] eacl: move package from neofs-api-go

Also, remove deprecated methods.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

eacl/target.go

@@ -0,0 +1,157 @@
+package eacl
+
+import (
+	"crypto/ecdsa"
+
+	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
+	v2acl "github.com/nspcc-dev/neofs-api-go/v2/acl"
+)
+
+// Target is a group of request senders to match EACL. Defined by role enum
+// and set of public keys.
+//
+// Target is compatible with v2 acl.EACLRecord.Target message.
+type Target struct {
+	role Role
+	keys [][]byte
+}
+
+func ecdsaKeysToPtrs(keys []ecdsa.PublicKey) []*ecdsa.PublicKey {
+	keysPtr := make([]*ecdsa.PublicKey, len(keys))
+
+	for i := range keys {
+		keysPtr[i] = &keys[i]
+	}
+
+	return keysPtr
+}
+
+// BinaryKeys returns list of public keys to identify
+// target subject in a binary format.
+func (t *Target) BinaryKeys() [][]byte {
+	return t.keys
+}
+
+// SetBinaryKeys sets list of binary public keys to identify
+// target subject.
+func (t *Target) SetBinaryKeys(keys [][]byte) {
+	t.keys = keys
+}
+
+// SetTargetECDSAKeys converts ECDSA public keys to a binary
+// format and stores them in Target.
+func SetTargetECDSAKeys(t *Target, pubs ...*ecdsa.PublicKey) {
+	binKeys := t.BinaryKeys()
+	ln := len(pubs)
+
+	if cap(binKeys) >= ln {
+		binKeys = binKeys[:0]
+	} else {
+		binKeys = make([][]byte, 0, ln)
+	}
+
+	for i := 0; i < ln; i++ {
+		binKeys = append(binKeys, (*keys.PublicKey)(pubs[i]).Bytes())
+	}
+
+	t.SetBinaryKeys(binKeys)
+}
+
+// TargetECDSAKeys interprets binary public keys of Target
+// as ECDSA public keys. If any key has a different format,
+// the corresponding element will be nil.
+func TargetECDSAKeys(t *Target) []*ecdsa.PublicKey {
+	binKeys := t.BinaryKeys()
+	ln := len(binKeys)
+
+	pubs := make([]*ecdsa.PublicKey, ln)
+
+	for i := 0; i < ln; i++ {
+		p := new(keys.PublicKey)
+		if p.DecodeBytes(binKeys[i]) == nil {
+			pubs[i] = (*ecdsa.PublicKey)(p)
+		}
+	}
+
+	return pubs
+}
+
+// SetRole sets target subject's role class.
+func (t *Target) SetRole(r Role) {
+	t.role = r
+}
+
+// Role returns target subject's role class.
+func (t Target) Role() Role {
+	return t.role
+}
+
+// ToV2 converts Target to v2 acl.EACLRecord.Target message.
+//
+// Nil Target converts to nil.
+func (t *Target) ToV2() *v2acl.Target {
+	if t == nil {
+		return nil
+	}
+
+	target := new(v2acl.Target)
+	target.SetRole(t.role.ToV2())
+	target.SetKeys(t.keys)
+
+	return target
+}
+
+// NewTarget creates, initializes and returns blank Target instance.
+//
+// Defaults:
+//  - role: RoleUnknown;
+//  - keys: nil.
+func NewTarget() *Target {
+	return NewTargetFromV2(new(v2acl.Target))
+}
+
+// NewTargetFromV2 converts v2 acl.EACLRecord.Target message to Target.
+func NewTargetFromV2(target *v2acl.Target) *Target {
+	if target == nil {
+		return new(Target)
+	}
+
+	return &Target{
+		role: RoleFromV2(target.GetRole()),
+		keys: target.GetKeys(),
+	}
+}
+
+// Marshal marshals Target into a protobuf binary form.
+func (t *Target) Marshal() ([]byte, error) {
+	return t.ToV2().StableMarshal(nil)
+}
+
+// Unmarshal unmarshals protobuf binary representation of Target.
+func (t *Target) Unmarshal(data []byte) error {
+	fV2 := new(v2acl.Target)
+	if err := fV2.Unmarshal(data); err != nil {
+		return err
+	}
+
+	*t = *NewTargetFromV2(fV2)
+
+	return nil
+}
+
+// MarshalJSON encodes Target to protobuf JSON format.
+func (t *Target) MarshalJSON() ([]byte, error) {
+	return t.ToV2().MarshalJSON()
+}
+
+// UnmarshalJSON decodes Target from protobuf JSON format.
+func (t *Target) UnmarshalJSON(data []byte) error {
+	tV2 := new(v2acl.Target)
+	if err := tV2.UnmarshalJSON(data); err != nil {
+		return err
+	}
+
+	*t = *NewTargetFromV2(tV2)
+
+	return nil
+}