package Ġorg . english club . associ ations game . backend kotlin spring . controller Ċ Ċ import Ġcom . fasterxml . jackson . databind . ObjectMapper Ċ import Ġcom . fasterxml . jackson . module . kotlin . register Kotlin Module Ċ import Ġorg . english club . associ ations game . backend kotlin spring . service . User Ċ import Ġorg . english club . associ ations game . backend kotlin spring . service . User NotFoundException Ċ import Ġorg . english club . associ ations game . backend kotlin spring . service . UserService Ċ import Ġorg . english club . associ ations game . backend kotlin spring . service . Username Already Taken Exception Ċ import Ġorg . springframework . http . HttpStatus Ċ import Ġorg . springframework . http . Response Entity Ċ import Ġorg . springframework . web . bind . annotation .* Ċ import Ġjava . time . LocalDateTime Ċ import Ġjava . util .* Ċ Ċ @ RestController Ċ class ĠAuth Controller ( val ĠuserService : ĠUserService , Ġval ĠobjectMapper : ĠObjectMapper ) Ġ{ ĊĊĠĠĠ Ġ@ PostMapping ("/ auth ") ĊĠĠĠ Ġfun Ġauth (@ RequestBody Ġrequest : ĠAuth Request ): ĠAuth Response Ġ{ ĊĠĠĠĠĠĠĠ Ġreturn ĠuserService . auth ( request . username ). to Auth Response () ĊĠĠĠ Ġ} ĊĊĠĠĠ Ġ@ GetMapping ("/ me ") ĊĠĠĠ Ġfun Ġwho Am I (@ RequestParam Ġtoken : ĠUser Token ): ĠUser Ġ{ ĊĠĠĠĠĠĠĠ Ġval ĠuserId Ġ= Ġtoken . to User Dto (). id ĊĠĠĠĠĠĠĠ Ġreturn ĠuserService . getById ( userId ) ĊĠĠĠ Ġ} ĊĊĠĠĠ Ġ@ PostMapping ("/ logout ") ĊĠĠĠ Ġfun Ġlogout (@ RequestBody Ġlogout Request : ĠLogout Request ) Ġ{ ĊĠĠĠĠĠĠĠ Ġval Ġuser Token Ġ= Ġlogout Request . token . to User Dto () ĊĠĠĠĠĠĠĠ ĠuserService . destroy ( user Token . id ) ĊĠĠĠ Ġ} ĊĊĠĠĠ Ġprivate Ġfun ĠUser . to Auth Response (): ĠAuth Response Ġ{ ĊĠĠĠĠĠĠĠ Ġval Ġuser Dto Ġ= ĠUser Token Dto ( id , Ġusername ) ĊĠĠĠĠĠĠĠ Ġval Ġuser Json Ġ= ĠobjectMapper . writeValue AsString ( user Dto ) ĊĠĠĠĠĠĠĠ Ġval Ġuser Token Ġ= ĠBase 6 4 . get Encoder (). encode ToString ( user Json . encode To ByteArray ()) ĊĠĠĠĠĠĠĠ Ġreturn ĠAuth Response ( success Ġ= Ġtrue , Ġtoken Ġ= Ġuser Token ) ĊĠĠĠ Ġ} ĊĊĠĠĠ Ġ@ ExceptionHandler ( Username Already Taken Exception :: class , ĠUser NotFoundException :: class ) ĊĠĠĠ Ġfun Ġexception Handler ( e : ĠRuntimeException ): ĠResponseEntity < ErrorResponse > Ġ{ ĊĠĠĠĠĠĠĠ Ġreturn Ġe . to BadRequest Response () ĊĠĠĠ Ġ} Ċ } Ċ Ċ fun ĠUser Token . to User Dto (): ĠUser Token Dto Ġ{ ĊĠĠĠ Ġval ĠobjectMapper Ġ= ĠObjectMapper (). register Kotlin Module () ĊĠĠĠ Ġval Ġuser Token Json String Ġ= ĠBase 6 4 . get Decoder (). decode ( this ). decode ToString () ĊĠĠĠ Ġreturn ĠobjectMapper . readValue ( user Token Json String , ĠUser Token Dto :: class . java ) Ċ } Ċ Ċ data Ġclass ĠAuth Request ( val Ġusername : ĠString ) Ċ Ċ data Ġclass ĠAuth Response ( val Ġsuccess : ĠBoolean , Ġval Ġtoken : ĠUser Token ) Ċ Ċ data Ġclass ĠLogout Request ( val Ġtoken : ĠUser Token ) Ċ Ċ data Ġclass ĠError Response ( ĊĠĠĠ Ġval Ġerror : ĠString , ĊĠĠĠ Ġval Ġstatus : ĠInt , ĊĠĠĠ Ġval Ġmessage : ĠString ?, ĊĠĠĠ Ġval Ġtimestamp : ĠLocalDateTime Ġ= ĠLocalDateTime . now () Ċ ) Ċ Ċ internal Ġfun ĠException . to Response ( status : ĠHttpStatus ) Ġ= ĊĠĠĠ ĠResponseEntity ( ErrorResponse ( status . reason Phrase , Ġstatus . value (), Ġmessage ), Ġstatus ) Ċ Ċ internal Ġfun ĠException . to BadRequest Response () Ġ= Ġto Response ( HttpStatus . BAD _ REQUEST )