package Ġat . rech ner her z . example . config . auth Ċ Ċ import Ġat . rech ner her z . example . domain . account . Account Ċ import Ġat . rech ner her z . example . domain . account . Account Repository Ċ import Ġorg . springframework . security . core . user details . User Ċ import Ġorg . springframework . security . core . user details . UserDetails Ċ import Ġorg . springframework . security . core . user details . UserDetails Service Ċ import Ġorg . springframework . security . core . user details . Username NotFoundException Ċ Ċ /** Ċ Ġ* ĠProvides Ġthe Ġ[ load User By Username ] Ġmethod Ġto Ġreceive Ġ[ UserDetails ] Ġfor Ġan Ġ[ Account ] Ġfrom Ġthe Ġdatabase . Ċ Ġ* Ċ Ġ* ĠIt Ġdoes Ġnot Ġauthenticate Ġthe Ġuser , Ġwhich Ġis Ġdone Ġbe Ġthe Ġ[ org . springframework . security . authentication . Authentication Manager ], Ċ Ġ* Ġwhich Ġin Ġturn Ġuses Ġone Ġor Ġmore Ġ[ org . springframework . security . authentication . Authentication Provider ]. Ċ Ġ* Ċ Ġ* ĠProvides Ġa Ġ[ User ] Ġobject Ġas Ġimplementation Ġfor Ġthe Ġ[ UserDetails ], Ċ Ġ* Ġwhere Ġthe Ġ[ Account . role ] Ġis Ġthe Ġonly Ġauthority Ġgranted Ġto Ġthe Ġ[ User ], Ċ Ġ* Ġand Ġ[ User . enabled ] Ġis Ġset Ġto Ġ[ Account . allowed To Authenticate ]. Ċ Ġ* Ċ Ġ* ĠSetting Ġany Ġof Ġthe Ġb ooleans Ġ([ User . enabled ], Ġ[ User . account Non Expired ], Ġ[ User . credentials Non Expired ], Ġ[ User . account Non Locked ]) Ċ Ġ* Ġto Ġ` false ` Ġwill Ġthrow Ġan Ġ[ org . springframework . security . authentication . Account Status Exception ] Ċ Ġ* Ġthat Ġcan Ġbe Ġcaught Ġin Ġ[ org . springframework . security . web . authentication . Authentication Failure Handler . on Authentication Failure ]. Ċ Ġ* Ċ Ġ* Ġ[ The ĠUser Details Service ]( https :// docs . spring . io / spring - security / site / docs / current / reference / html 5 /# tech - user detail ss ervice ) Ċ Ġ*/ Ċ class ĠAccount UserDetails Service ( ĊĠĠĠ Ġprivate Ġval Ġaccount Repository : ĠAccount Repository Ċ ) Ġ: ĠUser Details Service Ġ{ ĊĊĠĠĠ Ġ@ Throws ( Username NotFoundException :: class ) ĊĠĠĠ Ġoverride Ġfun Ġload User By Username ( username : ĠString ): ĠUser Details Ġ{ ĊĠĠĠĠĠĠĠ Ġval Ġaccount : ĠAccount Ġ= Ġaccount Repository . findBy Username ( username ) ĊĠĠĠĠĠĠĠĠĠĠĠ Ġ?: Ġthrow ĠUsername NotFoundException (" User Ġnot Ġfound : Ġ$ username ") ĊĊĠĠĠĠĠĠĠ Ġreturn ĠUser ( ĊĠĠĠĠĠĠĠĠĠĠĠ Ġaccount . username , ĊĠĠĠĠĠĠĠĠĠĠĠ Ġaccount . password , ĊĠĠĠĠĠĠĠĠĠĠĠ Ġaccount . allowed To Authenticate , ĊĠĠĠĠĠĠĠĠĠĠĠ Ġtrue , ĊĠĠĠĠĠĠĠĠĠĠĠ Ġtrue , ĊĠĠĠĠĠĠĠĠĠĠĠ Ġtrue , ĊĠĠĠĠĠĠĠĠĠĠĠ Ġset Of ( account . role ) ĊĠĠĠĠĠĠĠ Ġ) ĊĠĠĠ Ġ} Ċ Ċ } Ċ