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/authentication.go

@@ -9,6 +9,7 @@ import (
 	"github.com/mattermost/platform/utils"
 
 	"net/http"
+	"strings"
 )
 
 func checkPasswordAndAllCriteria(user *model.User, password string, mfaToken string) *model.AppError {
@@ -145,7 +146,11 @@ func authenticateUser(user *model.User, password, mfaToken string) (*model.User,
 			return ldapUser, nil
 		}
 	} else if user.AuthService != "" {
-		err := model.NewLocAppError("login", "api.user.login.use_auth_service.app_error", map[string]interface{}{"AuthService": user.AuthService}, "")
+		authService := user.AuthService
+		if authService == model.USER_AUTH_SERVICE_SAML || authService == model.USER_AUTH_SERVICE_LDAP {
+			authService = strings.ToUpper(authService)
+		}
+		err := model.NewLocAppError("login", "api.user.login.use_auth_service.app_error", map[string]interface{}{"AuthService": authService}, "")
 		err.StatusCode = http.StatusBadRequest
 		return user, err
 	} else {