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北京化工大学毕业设计(外文翻译)1OpenIDforJavaWebapplications,Part1EnableyourJavaWebapplicationstouseOpenIDauthenticationJStevenPerry,PrincipalConsultant,MakotoConsultingGroup,Inc.班级计科0602学号200640317姓名康玉凤SummaryOpenIDisadecentralizedauthenticationprotocolthatmakesiteasierforuserstoaccessresourcesinyourJava™Webapplications.Inthisfirsthalfofatwopartarticle,youlllearnabouttheOpenIDAuthenticationSpecificationandwalkthroughthestepsofincorporatingitintoasampleJavaapplication.RatherthanimplementtheOpenIDAuthenticationspecificationbyhand,authorJ.StevenPerryusestheopenid4javalibraryandapopularOpenIDprovider,myOpenID,tocreateasafeandreliableregistrationprocessforaJavaapplicationwritteninWicket.Tagsforthisarticleauthentication,java,openid,openid4java,signon,single,steve_perry,websOpenIDisadecentralizedauthenticationmechanism.UsingOpenID,IcanproveIownaURIsuchashttp//openid.jstevenperry.com/steve,andIcanusethatidentitytoauthenticatemyselfwithanysitethatsupportsOpenIDsuchasGoogle,Slashdot,orWordpress.Clearly,OpenIDisgreatforendusers.ButusingitgotmetothinkingWhataboutusingOpenIDtocreateastandard,reliableauthenticationsystemfortheJavabasedWebapplicationsIwriteformycustomersInthistwopartarticleIwillshowyouhowtousetheopenid4javalibraryandawellknownOpenIDprovider,myOpenID,tocreateanauthenticationsystemforaJavabasedWebapplication.IllalsoshowyouhowtoreceiveuserinformationwithanOpenIDSimpleRegistrationExtensionSReg.IllstartbyexplainingwhatOpenIDisandshowingyouhowtogetanOpenIDofyourown.Next,IwillpresentabriefoverviewofhowOpenIDauthenticationworks.Finally,IwillwalkthroughthestepsinvolvedinperformingOpenIDauthenticationusingopenid4java.Inthesecondhalfofthisarticle,youlllearnhowtocreateyourownOpenIDprovider.ThroughoutthediscussionIllbeworkingwithaWicketbasedJavaWebapplicationthatI北京化工大学毕业设计(外文翻译)2wrotespecificallyforthisarticle.Youcandownloadthesourcecodefortheapplicationanytime.Youalsomightwanttotakealookattheopenid4javalibraryseeResources.NoteThisarticlefocusesonusingOpenIDforJavaWebapplications,butOpenIDworksinanysoftwarearchitecturalscenario.IntroductiontoOpenIDOpenIDisaspecificationforprovingauserownsanidentifier.Fornow,justthinkofanidentifierasaStringthatuniquelyidentifiesauser.Ifyourelikeme,youownmanyidentifiersoruserids.IhaveauseridatFacebook,anotheratTwitter,andothersatdozensofsitesthatIusearoundtheInternet.IalwaystrytousethesameuseridbutitsnotavailableoneverynewsiteIsignupfor.So,IhaveamentalmapofallofmyuseridsandtheWebsitestheyreassociatedwith.WhatapainIusetheForgetyourpasswordfeaturealotItwouldbegreatiftherewereawaytoclaimasingleidentifieranduseiteverywhere.OpenIDsolvesexactlythisproblem.UsingOpenID,IclaimanidentifieranduseitonanysiteorWebresourcethathasadoptedtheprotocol.ThelatestfiguresfromtheOpenIDWebsitesaythatmorethan50,000WebsitessupportOpenID,includingFacebook,Yahoo,Google,andTwitter.OpenIDauthenticationOpenIDauthenticationisattheheartofOpenID,andconsistsofthreemainconceptsTheOpenIDIdentifierAStringoftextthatuniquelyidentifiestheuser.TheOpenIDRelyingPartyRPAnonlineresourceprobablyaWebsite,butitcouldbeafile,animage,orprettymuchanythingyouwanttocontrolaccesstothatusesOpenIDtoidentifywhocanaccessit.TheOpenIDProviderOPAsitewhereuserscanclaimanOpenIDandsubsequentlysigninandauthenticatetheiridentityforthebenefitofanyRP.TheOpenIDFoundationisaconsortiumwhosemembersareinterestedinpromotingopensourceidentitymanagementthroughtheOpenIDspecification.HowdoesOpenIDwork北京化工大学毕业设计(外文翻译)3SupposeauserisattemptingtoaccessaresourcethatispartofanRPsWebsite,andtheRPusesOpenID.Toaccesstheresource,theusermustpresenthisOpenIDinaformthatcanberecognizednormalizedasanOpenID.TheOpenIDisencodedwiththeOPslocation.TheRPthentakestheusersidentifierandredirectstheusertotheOP,wherehewillberequiredtoprovehisclaimtothatID.LetsbrieflyconsidereachcomponentoftheOpenIDspecificationanditsroleinthisprocess.OpenIDIdentifiersAttheheartofOpenIDis,ofcourse,theOpenIDIdentifier.AnOpenIDIdentifierorjustidentifierisahumanreadableStringofcharactersthatuniquelyidentifiessomeone.NotwousershavethesameOpenID,andthatswhatmakesOpenIDwork.ByfollowingstipulationsintheOpenIDAuthenticationSpecificationVersion2.0,OpenIDRPsareabletodecodeornormalizeanidentifiertofigureouthowtoauthenticateauser.IntheoperationalworldofOpenID,whereweasdeveloperswritecode,twoidentifiersareofinterestUserSuppliedIdentifierClaimedIdentifierAsthenamesuggests,aUserSuppliedIdentifieristheidentifiersuppliedbytheusertotheRP.TheUserSuppliedIdentifiermustbenormalizedintoaClaimedIdentifier,whichisjustafancywaytosaythattheidentifiersuppliedbytheuseristransformedintoastandardform.TheClaimedIdentifiercanthenbeusedtolocatetheOPthroughaprocesscalleddiscovery,afterwhichtheOPwillauthenticatetheuser.OpenIDRelyingPartyItisnormallytheRPthatispresentedwithaUserSuppliedIdentifier,whichisnormalizedtoaClaimedIdentifier.TheusersbrowsertheUserAgentwillberedirectedtotheOPsothattheusercanprovidehisorherpasswordandbeauthenticated.TheRPneitherknowsnorcaresaboutthespecificsofhowaClaimedIdentifierisauthenticateditonlywantstoknowwhethertheOPhassuccessfullyauthenticatedtheuser.Ifso,theUserAgentagain,probablytheusersbrowserisforwardedtothesecure北京化工大学毕业设计(外文翻译)4resourcethattheuserwasattemptingtoaccess.Iftheusercannotbeauthenticated,thentheRPdeniesaccess.OpenIDProviderOPTheOP,orOpenIDProvider,isresponsibleforissuingIdentifiersandperforminguserauthentication.OPsalsoprovideWebbasedmanagementofOpenIDs.OPscollectandholdthefollowingbasicinformationabouteachuserEmailaddressFullnameDateofbirthPostalcodeCountryPrimarylanguageWhenanOPisaskedtoauthenticateaClaimedIdentifier,theusersbrowserisdirectedtoasigninpagewheretheuserischallengedtoenterhispassword.Atthatpoint,controliswiththeOP.Iftheuserissuccessfullyauthenticated,thentheOPdirectsthebrowsertoalocationspecifiedbytheRPinaspecialreturntoURL.Iftheusercannotauthenticate,hewillprobablyreceiveamessagefromtheOPthathisauthenticationattemptfailedatleastthatsthecasewithClaimIDandmyOpenID,twopopularOpenIDProviders.BecominganOpenIDRelyingPartySonowyouknowaboutthemajorcomponentsofOpenIDandhowtheyfittogether.Fortheremainderofthearticle,wellfocusonwritinganOpenIDRelyingPartyRPusingtheopensourceopenid4javalibrary.ThefirststepinusingOpenIDistogetanidentifier.ItseasytodojustgotomyOpenIDandclicktheSIGNUPFORANOPENIDbutton.PickanOpenIDlikeredneckyogiorjstevenperrybothofwhicharemine,bytheway.Thesignupformwilltellyouwhethertheuseridyouvechosenisalreadytaken.Ifnot,youllbeinstructedtoenterapassword,anemailaddress,sometextinaJCaptchastyletextboxyourenotabot,areyou,andthatsitSomeminuteslateryoullgetanemailattheaddressprovidedcontainingalinkinit.Clickthelinktoconfirmyouremailaddressandcongratulationsyounowhavean
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