1 files changed, 150 insertions, 0 deletions
diff --git a/weed/s3api/auth_credentials.go b/weed/s3api/auth_credentials.go
new file mode 100644
index 000000000..9df1fdd29
--- /dev/null
+++ b/weed/s3api/auth_credentials.go
@@ -0,0 +1,150 @@
+package s3api
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+
+	"github.com/golang/protobuf/jsonpb"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/iam_pb"
+)
+
+type Action string
+
+const (
+	ACTION_READ  = "Read"
+	ACTION_WRITE = "Write"
+	ACTION_ADMIN = "Admin"
+)
+
+type Iam interface {
+	Check(f http.HandlerFunc, actions ...Action) http.HandlerFunc
+}
+
+type IdentityAccessManagement struct {
+	identities []*Identity
+}
+
+type Identity struct {
+	Name        string
+	Credentials []*Credential
+	Actions     []Action
+}
+
+type Credential struct {
+	AccessKey string
+	SecretKey string
+}
+
+func NewIdentityAccessManagement(fileName string) *IdentityAccessManagement {
+	iam := &IdentityAccessManagement{}
+	if fileName == "" {
+		return iam
+	}
+	if err := iam.loadIdentities(fileName); err != nil {
+		glog.Fatalf("fail to load config file %s: %v", fileName, err)
+	}
+	return iam
+}
+
+func (iam *IdentityAccessManagement) loadIdentities(fileName string) error {
+
+	identities := &iam_pb.Identities{}
+
+	rawData, readErr := ioutil.ReadFile(fileName)
+	if readErr != nil {
+		glog.Warningf("fail to read %s : %v", fileName, readErr)
+		return fmt.Errorf("fail to read %s : %v", fileName, readErr)
+	}
+
+	glog.V(1).Infof("maybeLoadVolumeInfo Unmarshal volume info %v", fileName)
+	if err := jsonpb.Unmarshal(bytes.NewReader(rawData), identities); err != nil {
+		glog.Warningf("unmarshal error: %v", err)
+		return fmt.Errorf("unmarshal %s error: %v", fileName, err)
+	}
+
+	for _, ident := range identities.Identities {
+		t := &Identity{
+			Name:        ident.Name,
+			Credentials: nil,
+			Actions:     nil,
+		}
+		for _, action := range ident.Actions {
+			t.Actions = append(t.Actions, Action(action))
+		}
+		for _, cred := range ident.Credentials {
+			t.Credentials = append(t.Credentials, &Credential{
+				AccessKey: cred.AccessKey,
+				SecretKey: cred.SecretKey,
+			})
+		}
+		iam.identities = append(iam.identities, t)
+	}
+
+	return nil
+}
+
+func (iam *IdentityAccessManagement) lookupByAccessKey(accessKey string) (identity *Identity, cred *Credential, found bool) {
+	for _, ident := range iam.identities {
+		for _, cred := range ident.Credentials {
+			if cred.AccessKey == accessKey {
+				return ident, cred, true
+			}
+		}
+	}
+	return nil, nil, false
+}
+
+func (iam *IdentityAccessManagement) Auth(f http.HandlerFunc, actions ...Action) http.HandlerFunc {
+
+	if len(iam.identities) == 0 {
+		return f
+	}
+
+	return func(w http.ResponseWriter, r *http.Request) {
+		errCode := iam.authRequest(r, actions)
+		if errCode == ErrNone {
+			f(w, r)
+			return
+		}
+		writeErrorResponse(w, errCode, r.URL)
+	}
+}
+
+// check whether the request has valid access keys
+func (iam *IdentityAccessManagement) authRequest(r *http.Request, actions []Action) ErrorCode {
+	var identity *Identity
+	var s3Err ErrorCode
+	switch getRequestAuthType(r) {
+	case authTypeUnknown, authTypeStreamingSigned:
+		return ErrAccessDenied
+	case authTypePresignedV2, authTypeSignedV2:
+		return ErrNotImplemented
+	case authTypeSigned, authTypePresigned:
+		identity, s3Err = iam.reqSignatureV4Verify(r)
+		if s3Err != ErrNone {
+			return s3Err
+		}
+	}
+
+	if !identity.canDo(actions) {
+		return ErrAccessDenied
+	}
+
+	return ErrNone
+
+}
+
+func (identity *Identity) canDo(actions []Action) bool {
+	for _, a := range identity.Actions {
+		for _, b := range actions {
+			if a == b {
+				return true
+			}
+		}
+	}
+	return false
+}