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

api/context.go

@@ -477,6 +477,11 @@ func RenderWebError(err *model.AppError, w http.ResponseWriter, r *http.Request)
 	link := "/"
 	linkMessage := T("api.templates.error.link")
 
+	status := http.StatusTemporaryRedirect
+	if err.StatusCode != http.StatusInternalServerError {
+		status = err.StatusCode
+	}
+
 	http.Redirect(
 		w,
 		r,
@@ -485,7 +490,7 @@ func RenderWebError(err *model.AppError, w http.ResponseWriter, r *http.Request)
 			"&details="+url.QueryEscape(details)+
 			"&link="+url.QueryEscape(link)+
 			"&linkmessage="+url.QueryEscape(linkMessage),
-		http.StatusTemporaryRedirect)
+		status)
 }
 
 func Handle404(w http.ResponseWriter, r *http.Request) {