Refactoring auth package and move into API

Signed-off-by: Evgeniy Kulikov <kim@nspcc.ru>

api/auth/center.go

@@ -3,7 +3,8 @@ package auth
 import (
 	"bytes"
 	"context"
-	"crypto/ecdsa"
+	"crypto/sha256"
+	"encoding/hex"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -13,10 +14,11 @@ import (
 
 	"github.com/aws/aws-sdk-go/aws/credentials"
 	v4 "github.com/aws/aws-sdk-go/aws/signer/v4"
+	sdk "github.com/nspcc-dev/cdn-neofs-sdk"
+	"github.com/nspcc-dev/cdn-neofs-sdk/creds/accessbox"
+	"github.com/nspcc-dev/cdn-neofs-sdk/creds/hcs"
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
 	"github.com/nspcc-dev/neofs-api-go/pkg/token"
-	"github.com/nspcc-dev/neofs-authmate/accessbox/hcs"
-	"github.com/nspcc-dev/neofs-authmate/agents/s3"
-	manager "github.com/nspcc-dev/neofs-authmate/manager/neofs"
 	"github.com/pkg/errors"
 	"go.uber.org/zap"
 )
@@ -24,92 +26,116 @@ import (
 var authorizationFieldRegexp = regexp.MustCompile(`AWS4-HMAC-SHA256 Credential=(?P<access_key_id_cid>[^/]+)/(?P<access_key_id_oid>[^/]+)/(?P<date>[^/]+)/(?P<region>[^/]*)/(?P<service>[^/]+)/aws4_request,\s*SignedHeaders=(?P<signed_header_fields>.+),\s*Signature=(?P<v4_signature>.+)`)
 
 type (
-	Center struct {
-		man *manager.Manager
-		reg *regexpSubmatcher
+	Center interface {
+		Authenticate(request *http.Request) (*token.BearerToken, error)
+	}
 
-		keys *hcs.X25519Keys
+	center struct {
+		cli sdk.Client
+		key hcs.PrivateKey
+		reg *regexpSubmatcher
 	}
 
 	Params struct {
-		Timeout time.Duration
-
-		Log *zap.Logger
-		Con manager.Connector
-
-		GAKey *hcs.X25519Keys
-		NFKey *ecdsa.PrivateKey
+		Client     sdk.Client
+		Logger     *zap.Logger
+		Credential hcs.Credentials
 	}
 )
 
 // New creates an instance of AuthCenter.
-func New(ctx context.Context, p *Params) (*Center, error) {
-	m, err := manager.New(ctx,
-		manager.WithKey(p.NFKey),
-		manager.WithLogger(p.Log),
-		manager.WithConnector(p.Con))
-
-	if err != nil {
-		return nil, err
-	}
-	return &Center{
-		man: m,
+func New(cli sdk.Client, key hcs.PrivateKey) Center {
+	return &center{
+		cli: cli,
+		key: key,
 		reg: &regexpSubmatcher{re: authorizationFieldRegexp},
-
-		keys: p.GAKey,
-	}, nil
+	}
 }
 
-func (center *Center) AuthenticationPassed(request *http.Request) (*token.BearerToken, error) {
-	queryValues := request.URL.Query()
+func (c *center) Authenticate(r *http.Request) (*token.BearerToken, error) {
+	queryValues := r.URL.Query()
 	if queryValues.Get("X-Amz-Algorithm") == "AWS4-HMAC-SHA256" {
 		return nil, errors.New("pre-signed form of request is not supported")
 	}
-	authHeaderField := request.Header["Authorization"]
+
+	authHeaderField := r.Header["Authorization"]
 	if len(authHeaderField) != 1 {
 		return nil, errors.New("unsupported request: wrong length of Authorization header field")
 	}
-	sms1 := center.reg.getSubmatches(authHeaderField[0])
+
+	sms1 := c.reg.getSubmatches(authHeaderField[0])
 	if len(sms1) != 7 {
 		return nil, errors.New("bad Authorization header field")
 	}
+
 	signedHeaderFieldsNames := strings.Split(sms1["signed_header_fields"], ";")
 	if len(signedHeaderFieldsNames) == 0 {
 		return nil, errors.New("wrong format of signed headers part")
 	}
-	signatureDateTime, err := time.Parse("20060102T150405Z", request.Header.Get("X-Amz-Date"))
+
+	signatureDateTime, err := time.Parse("20060102T150405Z", r.Header.Get("X-Amz-Date"))
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to parse x-amz-date header field")
 	}
+
 	accessKeyID := fmt.Sprintf("%s/%s", sms1["access_key_id_cid"], sms1["access_key_id_oid"])
-	res, err := s3.NewAgent(center.man).ObtainSecret(request.Context(), center.keys, accessKeyID)
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to fetch bearer token")
+
+	address := object.NewAddress()
+	if err = address.Parse(accessKeyID); err != nil {
+		return nil, errors.Wrapf(err, "could not parse AccessBox address: %s", accessKeyID)
 	}
-	otherRequest := request.Clone(context.TODO())
+
+	buf := new(bytes.Buffer)
+	if _, err = c.cli.Object().Get(r.Context(), address, sdk.WithGetWriter(buf)); err != nil {
+		return nil, errors.Wrapf(err, "could not fetch AccessBox: %s (%s / %s)",
+			accessKeyID,
+			address.ContainerID(),
+			address.ObjectID())
+	}
+
+	box := accessbox.NewBearerBox(nil)
+	if err = accessbox.NewDecoder(buf, c.key).Decode(box); err != nil {
+		return nil, err
+	}
+
+	data, err := box.Token().Marshal()
+	if err != nil {
+		return nil, err
+	}
+
+	hash := sha256.Sum256(data)
+	secret := hex.EncodeToString(hash[:])
+
+	otherRequest := r.Clone(context.TODO())
 	otherRequest.Header = map[string][]string{}
-	for hfn, hfvs := range request.Header {
+
+	for hfn, hfvs := range r.Header {
 		for _, shfn := range signedHeaderFieldsNames {
 			if strings.EqualFold(hfn, shfn) {
 				otherRequest.Header[hfn] = hfvs
 			}
 		}
 	}
-	awsCreds := credentials.NewStaticCredentials(accessKeyID, res.SecretAccessKey, "")
+
+	awsCreds := credentials.NewStaticCredentials(accessKeyID, secret, "")
 	signer := v4.NewSigner(awsCreds)
-	body, err := readAndKeepBody(request)
+
+	body, err := readAndKeepBody(r)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to read out request body")
 	}
-	_, err = signer.Sign(otherRequest, body, sms1["service"], sms1["region"], signatureDateTime)
+
+	hdr, err := signer.Sign(otherRequest, body, sms1["service"], sms1["region"], signatureDateTime)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to sign temporary HTTP request")
 	}
-	sms2 := center.reg.getSubmatches(otherRequest.Header.Get("Authorization"))
+
+	sms2 := c.reg.getSubmatches(hdr.Get("Authorization"))
 	if sms1["v4_signature"] != sms2["v4_signature"] {
 		return nil, errors.Wrap(err, "failed to pass authentication procedure")
 	}
-	return res.BearerToken, nil
+
+	return box.Token(), nil
 }
 
 // TODO: Make this write into a smart buffer backed by a file on a fast drive.

api/auth/regexp-utils.go

@@ -0,0 +1,20 @@
+package auth
+
+import "regexp"
+
+type regexpSubmatcher struct {
+	re *regexp.Regexp
+}
+
+func (r *regexpSubmatcher) getSubmatches(target string) map[string]string {
+	matches := r.re.FindStringSubmatch(target)
+	l := len(matches)
+
+	sub := make(map[string]string, l)
+	for i, name := range r.re.SubexpNames() {
+		if i > 0 && i <= l {
+			sub[name] = matches[i]
+		}
+	}
+	return sub
+}

auth/bearer-token.go

@@ -1,30 +0,0 @@
-package auth
-
-import (
-	"context"
-
-	"github.com/nspcc-dev/neofs-api-go/pkg/token"
-	"github.com/pkg/errors"
-)
-
-type contextKey string
-
-const bearerTokenContextKey contextKey = "bearer-token"
-
-// GetBearerToken returns a bearer token embedded into a context or error, if any.
-func GetBearerToken(ctx context.Context) (*token.BearerToken, error) {
-	bt := ctx.Value(bearerTokenContextKey)
-	if bt == nil {
-		return nil, errors.New("got nil bearer token")
-	}
-	v, ok := bt.(*token.BearerToken)
-	if !ok {
-		return nil, errors.Errorf("extracted unexpected type other than bearer token's: %T", v)
-	}
-	return v, nil
-}
-
-// SetBearerToken return a context with embedded bearer token.
-func SetBearerToken(ctx context.Context, bearerToken *token.BearerToken) context.Context {
-	return context.WithValue(ctx, bearerTokenContextKey, bearerToken)
-}

auth/regexp-utils.go

@@ -1,19 +0,0 @@
-package auth
-
-import "regexp"
-
-type regexpSubmatcher struct {
-	re *regexp.Regexp
-}
-
-func (resm *regexpSubmatcher) getSubmatches(target string) map[string]string {
-	matches := resm.re.FindStringSubmatch(target)
-	l := len(matches)
-	submatches := make(map[string]string, l)
-	for i, name := range resm.re.SubexpNames() {
-		if i > 0 && i <= l {
-			submatches[name] = matches[i]
-		}
-	}
-	return submatches
-}