package Ġfm . force . quiz . security . service Ċ Ċ import Ġfm . force . quiz . security . jwt . Jwt Authentication Exception Ċ import Ġjavax . servlet . http . HttpServletRequest Ċ import Ġorg . springframework . security . authentication . Bad Credentials Exception Ċ import Ġorg . springframework . security . authentication . Username Password Authentication Token Ċ import Ġorg . springframework . security . core . Authentication Ċ import Ġorg . springframework . stereotype . Service Ċ Ċ @ Service Ċ class ĠJwt Request Auth Provider ServiceImpl ( val Ġjwt Provider Service : ĠJwt Provider Service ) Ġ: ĠJwt Request Auth Provider Service () Ġ{ ĊĠĠĠ Ġprivate Ġval Ġbe arer Ġ= Ġ" bearer Ġ" ĊĠĠĠ Ġoverride Ġfun Ġauthenticate Request ( request : ĠHttpServletRequest ?): ĠAuthentication Ġ{ ĊĠĠĠĠĠĠĠ Ġrequest Ġ?: Ġthrow ĠJwt Authentication Exception (" It Ġmust Ġnever Ġhappen ") ĊĊĠĠĠĠĠĠĠ Ġval Ġauth Header Ġ= Ġrequest . getHeader (" authorization ") ĊĊĠĠĠĠĠĠĠ Ġwhen Ġ{ ĊĠĠĠĠĠĠĠĠĠĠĠ Ġ( auth Header Ġ== Ġnull ) Ġ-> Ġthrow ĠBad Credentials Exception (" Authorization Ġwas Ġnot Ġpresent ") ĊĠĠĠĠĠĠĠĠĠĠĠ Ġ( auth Header . isEmpty ()) Ġ-> Ġthrow ĠBad Credentials Exception (" Authorization Ġheader Ġis Ġempty ") ĊĠĠĠĠĠĠĠĠĠĠĠ Ġ( auth Header . length Ġ<= Ġbe arer . length ) Ġ-> Ġthrow ĠBad Credentials Exception (" Authorization Ġheader Ġis Ġcorrupted ") ĊĠĠĠĠĠĠĠĠĠĠĠ Ġ( auth Header . substring ( 0 , Ġbe arer . length ). toLowerCase () Ġ!= Ġbe arer ) ĊĠĠĠĠĠĠĠĠĠĠĠ Ġ-> Ġthrow ĠBad Credentials Exception (" Authorization Ġheader Ġmust Ġstart Ġwith Ġthe Ġ` Bearer ` Ġkeyword ") ĊĠĠĠĠĠĠĠ Ġ} ĊĊĠĠĠĠĠĠĠ Ġval Ġtoken Ġ= Ġauth Header . substring ( bearer . length ) ĊĠĠĠĠĠĠĠ Ġval Ġjwt UserDetails Ġ= Ġjwt Provider Service . extract UserDetails From AccessToken ( token ) ĊĠĠĠĠĠĠĠĠĠĠĠ Ġ?: Ġthrow ĠJwt Authentication Exception (" Provided Ġtoken Ġis Ġinvalid ") ĊĊĠĠĠĠĠĠĠ Ġreturn ĠUsername Password Authentication Token ( jwt UserDetails , Ġ"", Ġjwt UserDetails . author ities ) ĊĠĠĠ Ġ} Ċ } Ċ