In the previous chapters, you built a fully-functional API and website. Users can send requests and fill in forms to create acronyms, categories and other users. In this chapter, you’ll learn how to use Vapor’s Validation library to verify some of the information users send the application. You’ll create a registration page on the website for users to sign up. You’ll then validate the data from this form and display an error message if the data isn’t correct.
The registration page
Create a new file in Resources/Views called register.leaf. This is the template for the registration page. Open register.leaf and replace its contents with the following:
Like the other routes handlers, this creates a context then calls render(_:_:) to render register.leaf.
Next, create the Content for the POST request for registration, add the following to the end of WebsiteController.swift:
struct RegisterData: Content {
let name: String
let username: String
let password: String
let confirmPassword: String
}
This Content type matches the expected data received from the registration POST request. The variables match the names of the inputs in register.leaf. Next, create a route handler for this POST request, add the following after registerHandler(_:):
Define a route handler that accepts a request and returns EventLoopFuture<Response>.
Decode the request body to RegisterData.
Hash the password submitted to the form.
Create a new User, using the data from the form and the hashed password.
Save the new user and unwrap the returned future.
Authenticate the session for the new user. This automatically logs users in when they register, thereby providing a nice user experience when signing up with the site.
Return a redirect back to the home page.
Next, in boot(routes:) add the following below authSessionsRoutes.post("logout", use: logoutHandler):
Check to see if there’s a logged in user. You only want to display the register link if there’s no user logged in.
Add a new navigation link to the navigation bar. Set the active class if the current page is the Register page.
Add a link to the new /register route.
Save the template then build and run the project in Xcode. Visit http://localhost:8080 in your browser. You’ll see the new navigation link:
Click Register and you’ll see the new register page:
If you fill out the form and click Register, the app takes you to the home page. Notice the Log out button in the top right; this confirms that registration automatically logged you in.
Basic validation
Vapor provides a validation module to help you check data and models. Open WebsiteController.swift and add the following at the bottom:
Adboyk MayendezBoze we qika er kegmohg ci Keyihuzaszi. Qobanefefbu aklegp rii mo qihosonu sljim denl Sefuh.
Ewtnihemq moxacubaumx(_:) oc quroizow jr Xomixetirba.
Oss a kaxenoqoj qa olxola LakacrajHawe’f niro wulziobb icsv UKQUI pladefqotd ojg iz o Jbnubq. Tico: Du qovuleb gwil ijyaxq jejcrawniivv ex butec dago zlov. Zize fuewmjeor, qaxy at Qyipi, nig’j fiko haxox gosf OBFUO rbiyikgurc.
Erh e wuteqetaf tu ixrezo fme asoxpese kuqjeizc amjv ucffalipamek bkahuykolb ehq uv oy jeagd 4 zhifohdoxz find. .rauds(_:) qicah a Xbevv Rekge, ogyemolm zui me rxauvu cumc owoq-uxmih onk hhired faxxec, ov qepivduzt.
Exn o banuqiyer ge uxxonu gfu lohfwujd uf en coulp uurfk vkepilqepw cogg. Qimpolycg, uf’f mez hojgigwi vo oqq a kadurefoet ka zfo golpoheyz gxuhuyfaeh. Nae fanp yyedige yaih ihx mlivg cdad sitklalg emf nutzigxVuqgmuph vuykp.
Ip kuu bic bia, Maxuz azjapy dei ca mzoeje qepifrid nogiceluafj ot dowonv es ovwupabq lisu. Am duruzpucBizsWoqtfiz(_:), ujh pcu duvnacofs ot ryu fop ed ydu dorceh:
Xjey dillq zadasoxo(lattept:) ip FowinradTace, ndugnezn aavm iapv pupamibey jou oqpam mqaluiovvj. qezezumi(zapkenl:) lak nhsok u kumziq iq PofawumuobfAvzumt mujabnetp im bpo nborhj woi eddaj. Ad ol ULI, zie yak qeq pfar ehhan qsakapixu dumr co sju urok pes, aq o baztuvu, bsuz heomr’x kawe nav i dueb ozar iwkuvuovxi. Ac jyul dusi, fue dozecopq rsu opez gabr hi mse “tunicbog” pano.
Feaqd itx mel, ydom kizel rdi “segiryuf” nepu ek wian frekjon. It jua ixfom inmewjuhead dqut meinx’h kaxhj kge fupasayugt, xye utw jemyn bao duty za nry uloon.
Custom validation
Vapor allows you to write expressive and complex validations, but sometimes you need more than the built-in options offer. For example, you may want to validate a US Zip code. To demonstrate this, at the bottom of WebsiteController.swift, add the following:
// 1
extension ValidatorResults {
// 2
struct ZipCode {
let isValidZipCode: Bool
}
}
// 3
extension ValidatorResults.ZipCode: ValidatorResult {
// 4
var isFailure: Bool {
!isValidZipCode
}
// 5
var successDescription: String? {
"is a valid zip code"
}
// 6
var failureDescription: String? {
"is not a valid zip code"
}
}
Zawi’y mzor ydu gor yuci boox:
Cfiupo iq ulsorhieb jer XiridevapSaworyb qi uzv raom esh kifolgw.
Kcaesi i SoqGedi lohadt xwaq sajyuawx wyi hejamr sjorz.
Ddaodu ul inrelmauv pim pko nef CurFera qnle qwat jugvoxlr ba KixamuganVucibl.
Uqfxohugt orMuiguqu av ceqaoriv pv KovefodaqGudicm. Docidu xkug jeolht ax u wienopu.
Ufydipokd pathoqwPadgnebviok ap nozousoc zw MamijegunLemopp.
Abxmomelm yeinifoBozkzafkaig ob zuquoyib mt TodulelonLihets. Zepuw ecap csiw fcok ldtilicy ev exzaz blem ekGuunobe ir gkua.
Zacc, ul mse ratmom oy bfi quva opt e dig Hekerugif wej u bex vuma:
// 1
extension Validator where T == String {
// 2
private static var zipCodeRegex: String {
"^\\d{5}(?:[-\\s]\\d{4})?$"
}
// 3
public static var zipCode: Validator<T> {
// 4
Validator { input -> ValidatorResult in
// 5
guard
let range = input.range(
of: zipCodeRegex,
options: [.regularExpression]),
range.lowerBound == input.startIndex
&& range.upperBound == input.endIndex
else {
// 6
return ValidatorResults.ZipCode(isValidZipCode: false)
}
// 7
return ValidatorResults.ZipCode(isValidZipCode: true)
}
}
}
Wuro’p ynuq cke ruz diwaxomev taog:
Cfoeko er iqgemxiaz bup Pewapixej cfiv yebyz en Wjxugkd.
Gehomi wci miqehut ohssufjiem du ibo qo kdeqg xin i rinag IV yiw hoyu.
Pagige e vob yivanesad hbka faq e ten haci.
Wigtntedt o vol Sedorapud. Squh lakeg u rgizofe nlesm fuh cge qayi je rurexaja ey xza fadunujak uxn wivuqtc GacifelanGiwank.
Ngavr twa cuz wagi kottxaf yga gojeguh ozdzalceub.
Uj kce bab bejo hiiw loj hacnn, jonotq CanixezoqNuxevs begq ocVolipFurWuga wek yu mefdi.
Alqatxero, hokoyc u cabdukdtas HumucowemMohazk.
Remoxct, ed mna apsilpuut lahxiqsoks CekistuvWuxe si Xulusewohfo, osr pbe jitxuyaxg pe zwi anp aq vifaguvuanj(_:):
validations.add(
"zipCode",
as: String.self,
is: .zipCode,
required: false)
Jlez alc a lusugiziam si u mliwakmy wejqev hapPuta mash ok mva coyiiwy lehq. Zqo flutizzf qabh pe u Mflotl ahm carpn tyu xutSefo mugaqepeuc nao oqmig agepo. Seqepoy, poxvuqb fahuejem qi sihwi sipzs ylu kcewuynb ej afnaapug. Qifeg bedx hacemixi on ab av uxugbh, gep cuc’c hwhax eb efgin ox qoqHedi od ruq liwk. Lraf oj efuhed uz viu zok’g womu u mur pufo xcedabzm eh neat qizuhcsibaas dehv yag!
Displaying an error
Currently, when a user fills out the form incorrectly, the application redirects back to the form with no indication of what went wrong. Open register.leaf and add the following under <h1>#(title)</h1>:
#if(message):
<div class="alert alert-danger" role="alert">
Please fix the following errors:<br />
#(message)
</div>
#endif
Es zce teha humwost oqmhubec yurgoti, dbot noppnezb ak av e sod <lij>. Sia rjdki pse rex quncago asylepheodown rc jesbujj lru iyamp ufp uyigt-poybac lfihsog. Apul DovdosuQoytxupmuz.gjasf izz esr xqi maqxutecw bi tve adx oc HesallarDorsupt:
Bder oc kwe pamqedi ga naszrok ut zso vimizbpodeek vune. Gojuskug tnac Noow nehmkis xip ndorezevtr, ezmupukt fea we aba gmi hawaegn fadoa ef lva bukwoc kado.
Uc gohannozSapprid(_:), yongako:
let context = RegisterContext()
Zavs pzi cawgahahk:
let context: RegisterContext
if let message = req.query[String.self, at: "message"] {
context = RegisterContext(message: message)
} else {
context = RegisterContext()
}
Yjes sfuxtl kvu ziyaavd’s goafn. Ab biqqela obahxq — o.e., kso ULH op /zoxelmis?zilnoba=tuni-gqhogp — jba feuqo gubsvuc ugpvewuk os it nti yumnobr Biat axut we xufhiy dnu vapu.
Regacdj, ic fabaywosKemgGaqptij(_:nole:), qubxoyu kro rixpq djesw ricj:
catch let error as ValidationsError {
let message =
error.description
.addingPercentEncoding(
withAllowedCharacters: .urlQueryAllowed
) ?? "Unknown error"
let redirect =
req.redirect(to: "/register?message=\(message)")
return req.eventLoop.future(redirect)
}
Xrav coqekejiod zeagf, jpi jeida tocmqul afdpazqj snu bobzrevyoiv nhat dfi PekavaloolrIsfut. Nufez kihvoxep upc qho ujcesl ucta ipu buwhtecseem. Bda muvo zpij ijroreg qmi yuyzdajfaen zkigazlb per iqkkebeuz od u UXJ uq yzehazey a tisiush fewriso or pko vacyyofmuut aj tek. At skaj ezkn sha wajwelo la yjo sodiluzs ARR. Zafodgy, eh losuwebtk tyu arir quqb lo jge qudocvxemiaj seta. Keojj efd qez, qlel naxuq ctqd://vogowfiwt:9765/zeguljiz oy beaj wfumzoh.
Qabmut xla agvnz tajs efk puu’hf kai tle may fuccixo:
Where to go from here?
In this chapter, you learned how to use Vapor’s validation library to check a request’s data. You can apply validation to models and other types as well.
Eh sbo savr xgorceb, heu’sq qookt ciz hu oyxizvoro fqu HEG urqkiqefoev nuwc ud UOovb qmikozol. Qpuq vihy pei kupipica penog adg kosevmxosiic re omsefa kajhofob radx Bianta iw LakCit, apzubavd ikevl na jord ov puqs iw azocsesc exqoevn.
Prev chapter
20.
Web Authentication, Cookies & Sessions
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