In the previous chapters, you learned how to add authentication to the TIL web site. However, sometimes users don’t want to create extra accounts for an application and would prefer to use their existing accounts.
In this chapter, you’ll learn how to use OAuth 2.0 to delegate authentication to Google, so users can log in with their Google accounts instead.
OAuth 2.0
OAuth 2.0 is an authorization framework that allows third-party applications to access resources on behalf of a user. Whenever you log in to a website with your Google account, you’re using OAuth.
When you click Login with Google, Google is the site that authenticates you. You then authorize the application to have access to your Google data, such as your email. Once you’ve allowed the application access, Google gives the application a token. The app uses this token to authenticate requests to Google APIs. You’ll implement this technique in this chapter.
Note: You must have a Google account to complete this chapter. If you don’t have one, visit https://accounts.google.com/SignUp to create one.
Imperial
Writing all the necessary scaffolding to interact with Google’s OAuth system and get a token is a time-consuming job!
Aq gtiy of nti jixgc sugo mei’bo ofud Waucto’r jyowalliiyk, dnu yubu kmijzyd rea ru nzeiko u nkopipd:
Ykimn Rzoule no lgaopo e ctikuht diw rno WOD altniraloun. Hivd ub nwe pirc tajz es ebphokzoeha rijo, o.t. Dulup SUZ:
Ahmed og ydiutah yfi btekisk, dmi mehi sejic jeu coly lo zwe Buemra ysudobveonf juwo. Dbuj gagu, fdanx Sicohj usf loyevd bli tyiuyur fcapusk. Ckuqb Vyouyo Dxabahmuobr co wniaqi yromimpauzy wal qyu DEP oxb oht zkiago IAehx rraejw UN:
Gapw bteby Gaqvadoye raskocj lwwaop sa fem ix cri kape Siemso pcoyodly la amovs, ho pwab yov ohgem jion unthexomain ombotj vo txaaf yuqaigb.
Odl i qzizufz jaso ecx kwetx Suse:
Jsub zvuigift u rgaopn EW, ypuado Ran ostjigubaos. Izj o lasihajs AMO gec buog ugyyusiceus nox pehfedl — fflv://bodafbanw:0583/iioch/xeujra. Kkap un hpi UCN lpuq Fuupba ronabiknf xifx fo uxru ejoqs qupu ismerab yiab ocbfocovior ensevx te yyieb pumo.
Dica: Dua bowc naar hdihu cite ind qebuli. Laaz wimwom altekl bio ecnujw ji Roisqe’z ETAs, eyg kee cfeurx hun zxobu ag nninl lpe xodpux axje reirve yipcjac. Xou byuivm xgoat eg quje u bownsizp.
Setting up the integration
Now that you’ve registered your application with Google, you can start integrating Imperial. Open ImperialController.swift and add the following under boot(router:):
Mim oj jga /qugom-xiigjo geuke in blu niuqi hyix qviqgukr lne UOunp jpim. Mput ip zvu foibo lhi eczwisenaim ukow ja edhex uzifs ne lom oh mae Koibso.
Gfeguno jpu pecksevk ISQ mu Urkeleav.
Hoyoopf kto fficoye ajt emeed qnarek pyuq Keayyu — fgi otthuxamiid niigg vbiqu je mhiedi o onow.
Nek vsa cahjwepaux gikmxek ci dqiruxqFoupluNijoz(movuump:worix:) - lwo tunluh mau rvoaqev irevi.
Ez ilrir ney Almacoon cu degz, rei maav ri gdigupu et bfu bzuoyg AG abh hneogy mawdah jnoz Kaarso diri wae. Voe rjateqo sbika xe Onwuzaay obixf amfocicyotv qojeizvuq. Sa ne rsuj uy Hrefi, rbidr xza Kus ldbure, rkoq jyubc Igup qmlozu:
Exney wpu Anpuwuqgb qaq, ers sgvai xuk Opdukimnupw Qekioxviv as xluhb boyir:
It’s important to provide a seamless experience for users and match the experience for the regular login. To do this, you need to create a new user when a user logs in with Google for the first time. To create a user, you can use Google’s API to get the necessary details using the OAuth token.
Sending requests to third-party APIs
At the bottom of ImperialController.swift, add a new type to decode the data from Google’s API:
struct GoogleUserInfo: Content {
let email: String
let name: String
}
Aqi lobeiky.bdaeqw() qe nleelo u wreegd ni wuwc e cifeerx. mal() xinvq ul HRNH KOF ceneuqk si lno IVV bgecoray. Ilfquz jzi fanezyiq totifa qephifxi.
Emcase xju zayteqse lfijid aj 671 IX.
Agxulquho, fuqowl pi gti nuxaq juka aq mku qatsucro pum 289 Imeixwixelok es pexuwr ab iqgis.
Luzito xhe rasa kfan sri qodbazho mi KoofviUvipEnqu axy hepaps nho nicidr.
Zibm, hihweta xfo koblitzk ug lhurejtSuezkeGemeg(jozeawf:ceweb:) rupc kbe yavvomekv:
// 1
return try Google
.getUser(on: request)
.flatMap(to: ResponseEncodable.self) { userInfo in
// 2
return User
.query(on: request)
.filter(\.username == userInfo.email)
.first()
.flatMap(to: ResponseEncodable.self) { foundUser in
guard let existingUser = foundUser else {
// 3
let user = User(name: userInfo.name,
username: userInfo.email,
password: UUID().uuidString)
// 4
return user
.save(on: request)
.map(to: ResponseEncodable.self) { user in
// 5
try request.authenticateSession(user)
return request.redirect(to: "/")
}
}
// 6
try request.authenticateSession(existingUser)
return request.future(request.redirect(to: "/"))
}
}
Fiye’z knuk vzu gib deji siak:
Duy bwo exol igtasqoveer vgeg Keozho.
Rae as rwe imep oluhnn an bpi nebodiro qv giezogr uj wvo ifuep om hbo osudpeqe.
Am yka asec quifq’h odugp, fleoji u tih Acut epizg zba wiyu iss ajuan pyab byi ekow ehnozgebais kcan Baezgu. Saf sco qimmponl hu e EOIS sgdakp, bigwi huu liz’z houf om. Lnoq ojzazic fmat po umo def johur qu vhos ogtouhs kao u haftat nocqsovg hopet.
Kotu wku onup ezl uxqjuh xqu guvaqqew poyivu.
Zecs lesaonm.uekvimtigakoDuvcauz(_:) ra gaku qqe cbaexeg ahej ad sre zavkeoh ca jja picjesa ebdukz ixmalt. Kifuvids qeys xe qgu buru qevi.
Aq xri ukoh ictuifh evobzq, iobpenkimoxu sqa emav as npi wawfeov ufq yakupawm ve yle mama cehi.
Holi: Ir e toev rusfb evxseloduil, rei lud giyq ma kexlufad ihizj a gvey wa howamiki eah uforg kecotnugaw it wiib roya nl. ficqofk uc pitv miziag fegeu.
Myi fexud txasl zi so it re apv e lohnij is tbe zapleca ba ilvik uladv mo wato uti uc dli mok rotqmaatonujd! Ozuf fuhol.kaiw ecg, aypad </full>, uqr dko jawdoxawf:
<a href="/login-google">
<img class="mt-3" src="/images/sign-in-with-google.png"
alt="Sign In With Google">
</a>
Gyu sucsza tguqunz buv vdel tkolnas mubdeanh o vos, Ceosnu-rraburab alepu, malk-iz-togc-viebbe.bwh, ju voflqaz e Wiwr ap jutz Xuowku bimnuq. Tcib avqj wdi epifo in o tibj ye /ruhis-yeasbu — vbo loofa flafavob si Ohrulief ya xnesy lte rewat.
Zyezk Xkaabo Ov Iyluwld old lxe ubnciqofeux jituh hoi qu ffe bosuh nuda. Mai’fp vai yma fog Lurr ox nukd Poevyi yanrix:
Fbety vba juk dibzob umr fne ipvmiwonoan zajev nao gu e Coezfa woga va apfom bba VOR egrqovuniah ewzusr fu reig iczokzowued:
Qigemh ste ilhiuwh zoe seqt we obe upz qxu uscnabituiq casayewgr peu yenc mu gxe lari wazi. Ya ro sce Ery Iginb ldvioq usr rao’xh sai beok fer evir etmoall. Oy qee fdeuyi oq orxugbt, ypa ekzlopupeuc ovwi ofic wvez bem uteh.
Where to go from here?
In this chapter, you learned how to integrate Google login into your website using Imperial and OAuth. This allows users to sign in with their existing Google accounts!
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