SAML support (#3494)

* PLT-3073: Implement SAML/Okta Server side (EE) (#3422)

* PLT-3137 Support for SAML configuration

* PLT-3410 SAML Database Store

* PLT-3411 CLI to add Identity Provider Certificate and Service Provider Private Key

* PLT-3409 SAML Interface for EE

* PLT-3139 Handle SAML authentication server side

* Add localization messages

* PLT-3443 SAML Obtain SP metadata

* PLT-3142 Login & Switch to/from SAML

* Remove Certs for Database & Clean SAML Request

* Make required Username, FirstName and LastName

* PLT-3140 Add SAML to System Console (#3476)

* PLT-3140 Add SAML to System Console

* Move web_client functions to client.jsx

* Fix issues found by PM

* update package.json mattermost driver

* Fix text messages for SAML

model/saml.go

@@ -0,0 +1,18 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+const (
+	USER_AUTH_SERVICE_SAML      = "saml"
+	USER_AUTH_SERVICE_SAML_TEXT = "With SAML"
+	SAML_IDP_CERTIFICATE        = 1
+	SAML_PRIVATE_KEY            = 2
+	SAML_PUBLIC_CERT            = 3
+)
+
+type SamlAuthRequest struct {
+	Base64AuthRequest string
+	URL               string
+	RelayState        string
+}