users service: add sessions (#17744)

* users: add cache to service

* reflect review comments

app/team.go

@@ -19,6 +19,7 @@ import (
 	"github.com/mattermost/mattermost-server/v5/app/request"
 	"github.com/mattermost/mattermost-server/v5/model"
 	"github.com/mattermost/mattermost-server/v5/plugin"
+	"github.com/mattermost/mattermost-server/v5/services/users"
 	"github.com/mattermost/mattermost-server/v5/shared/i18n"
 	"github.com/mattermost/mattermost-server/v5/shared/mlog"
 	"github.com/mattermost/mattermost-server/v5/store"
@@ -1521,7 +1522,7 @@ func (a *App) InviteGuestsToChannelsGracefully(teamID string, guestsInvite *mode
 			Email: email,
 			Error: nil,
 		}
-		if !CheckEmailDomain(email, *a.Config().GuestAccountsSettings.RestrictCreationToDomains) {
+		if !users.CheckEmailDomain(email, *a.Config().GuestAccountsSettings.RestrictCreationToDomains) {
 			invite.Error = model.NewAppError("InviteGuestsToChannelsGracefully", "api.team.invite_members.invalid_email.app_error", map[string]interface{}{"Addresses": email}, "", http.StatusBadRequest)
 		} else {
 			goodEmails = append(goodEmails, email)
@@ -1594,7 +1595,7 @@ func (a *App) InviteGuestsToChannels(teamID string, guestsInvite *model.GuestsIn
 
 	var invalidEmailList []string
 	for _, email := range guestsInvite.Emails {
-		if !CheckEmailDomain(email, *a.Config().GuestAccountsSettings.RestrictCreationToDomains) {
+		if !users.CheckEmailDomain(email, *a.Config().GuestAccountsSettings.RestrictCreationToDomains) {
 			invalidEmailList = append(invalidEmailList, email)
 		}
 	}