package Ġcom . e ighth ours . ilo has . framework . security čĊč Ċ import Ġcom . e ighth ours . ilo has . domain . system . User č Ċ import Ġcom . e ighth ours . ilo has . domain . system . UserRepository č Ċ import Ġorg . springframework . security . core . Authentication Exception č Ċ import Ġorg . springframework . stereotype . Service č Ċ import Ġjavax . inject . Inject čĊčĊč Ċ @ Service č Ċ class ĠUser Authentication Service Ġ{ čĊčĊĠĠĠ Ġ@ Inject čĊĠĠĠ Ġprivate Ġlateinit Ġvar Ġrepository : ĠUser Repository čĊčĊĠĠĠ Ġ@ Throws ( Authentication Exception :: class ) čĊĠĠĠ Ġfun Ġauthenticate ( username : ĠString , Ġpassword : ĠString ): ĠUser Ġ{ čĊĠĠĠĠĠĠĠ Ġval Ġmaybe User Ġ= Ġrepository . find ByName ( username ) čĊĠĠĠĠĠĠĠ Ġval Ġuser Ġ= Ġmaybe User Ġ?: Ġthrow ĠUser NotFoundException ( username ) čĊčĊĠĠĠĠĠĠĠ Ġ// ĠTODO Ġauthentication čĊčĊĠĠĠĠĠĠĠ Ġreturn Ġuser čĊĠĠĠ Ġ} č Ċ } čĊčĊč Ċ class ĠUser NotFoundException ( username : ĠString ) Ġ: ĠAuthentication Exception ( username ) čĊ