From ce7c8932d4e2e685f7b2bea0d3e5925c5269cba8 Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Tue, 25 May 2021 19:52:29 +0300
Subject: [PATCH] authmate: drop creds/s3 dependency

Signed-off-by: Roman Khimov <roman@nspcc.ru>
---
 api/auth/center.go   |  4 ++--
 authmate/authmate.go | 18 +++++++++++++++---
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/api/auth/center.go b/api/auth/center.go
index 0d0d35f..43c238b 100644
--- a/api/auth/center.go
+++ b/api/auth/center.go
@@ -15,9 +15,9 @@ import (
 	sdk "github.com/nspcc-dev/cdn-sdk"
 	"github.com/nspcc-dev/cdn-sdk/creds/bearer"
 	"github.com/nspcc-dev/cdn-sdk/creds/hcs"
-	"github.com/nspcc-dev/cdn-sdk/creds/s3"
 	"github.com/nspcc-dev/neofs-api-go/pkg/object"
 	"github.com/nspcc-dev/neofs-api-go/pkg/token"
+	"github.com/nspcc-dev/neofs-s3-gw/authmate"
 	"go.uber.org/zap"
 )
 
@@ -100,7 +100,7 @@ func (c *center) Authenticate(r *http.Request) (*token.BearerToken, error) {
 		return nil, err
 	}
 
-	secret, err := s3.SecretAccessKey(tkn)
+	secret, err := authmate.BearerToAccessKey(tkn)
 	if err != nil {
 		return nil, err
 	}
diff --git a/authmate/authmate.go b/authmate/authmate.go
index 0f00cd3..214f7da 100644
--- a/authmate/authmate.go
+++ b/authmate/authmate.go
@@ -3,6 +3,8 @@ package authmate
 import (
 	"context"
 	"crypto/ecdsa"
+	"crypto/sha256"
+	"encoding/hex"
 	"encoding/json"
 	"fmt"
 	"io"
@@ -14,7 +16,6 @@ import (
 	"github.com/nspcc-dev/cdn-sdk/creds/bearer"
 	"github.com/nspcc-dev/cdn-sdk/creds/hcs"
 	"github.com/nspcc-dev/cdn-sdk/creds/neofs"
-	"github.com/nspcc-dev/cdn-sdk/creds/s3"
 	"github.com/nspcc-dev/neofs-api-go/pkg/acl/eacl"
 	"github.com/nspcc-dev/neofs-api-go/pkg/container"
 	"github.com/nspcc-dev/neofs-api-go/pkg/netmap"
@@ -127,7 +128,7 @@ func (a *Agent) IssueSecret(ctx context.Context, w io.Writer, options *IssueSecr
 		return fmt.Errorf("failed to put bearer token: %w", err)
 	}
 
-	secret, err := s3.SecretAccessKey(tkn)
+	secret, err := BearerToAccessKey(tkn)
 	if err != nil {
 		return fmt.Errorf("failed to get bearer token secret key: %w", err)
 	}
@@ -157,7 +158,7 @@ func (a *Agent) ObtainSecret(ctx context.Context, w io.Writer, options *ObtainSe
 		return fmt.Errorf("failed to get bearer token: %w", err)
 	}
 
-	secret, err := s3.SecretAccessKey(tkn)
+	secret, err := BearerToAccessKey(tkn)
 	if err != nil {
 		return fmt.Errorf("failed to get bearer token secret key: %w", err)
 	}
@@ -234,3 +235,14 @@ func buildBearerToken(key *ecdsa.PrivateKey, oid *owner.ID, table *eacl.Table) (
 
 	return bearerToken, bearerToken.SignToken(key)
 }
+
+// BearerToAccessKey returns secret access key generated from given BearerToken.
+func BearerToAccessKey(tkn *token.BearerToken) (string, error) {
+	data, err := tkn.Marshal()
+	if err != nil {
+		return "", err
+	}
+
+	hash := sha256.Sum256(data)
+	return hex.EncodeToString(hash[:]), nil
+}