Update vendor (github.com/mattermost)

vendor/github.com/mattermost/mattermost-server/einterfaces/oauthproviders.go

@@ -0,0 +1,29 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package einterfaces
+
+import (
+	"github.com/mattermost/mattermost-server/model"
+	"io"
+)
+
+type OauthProvider interface {
+	GetIdentifier() string
+	GetUserFromJson(data io.Reader) *model.User
+	GetAuthDataFromJson(data io.Reader) string
+}
+
+var oauthProviders = make(map[string]OauthProvider)
+
+func RegisterOauthProvider(name string, newProvider OauthProvider) {
+	oauthProviders[name] = newProvider
+}
+
+func GetOauthProvider(name string) OauthProvider {
+	provider, ok := oauthProviders[name]
+	if ok {
+		return provider
+	}
+	return nil
+}