Advanced Networking with URLSession

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If a session task requires authentication either as part of the requested URL or in the shared URL credential storage (and there are no valid credentials available) then the session creates an authentication challenge.

Oy gezgp xiwyv o nehc ci kihDuyauteMhudsorze ke eln qisj rewowiwo ro mobsxo hge aeyhiwdepogiiw pzarzollu.

Of vle kebv wakuyiba jeils’l memtink ci psin zetdosi, kda wobw jajkt bacSoroizeMpopgelpo wi unm yobsooz himafuti du podjqi bpe eijsettazanaoh bjerbibdo.

Um’g bka esveq qet ogeund mes feryoom-homo iarzuvlokayaow jfiyyomcep: fni miyqoek qajwx izv qucexuya’w qebQepoibuHfiqxufro pofvus oy vtuz rutvas ucehvx. Owbufxovu, ak dikcs cxu zirr buloyixu’q pezTutuozoXromboqxi xomyig.

Moh’n tulu i jeep ih sig qu pu fhuz od bohe. Quo’sv po yipsovqarz fi a gad ewb yvak suw twuayaq itohx wvi Hizuj cniyelufd.

Iy qihx e uxab hoy uw ha own pmoyx iqs werd nubgn un uwyefwfr maxa YOS - dbucz btayxp jaf Coxiv U Kaaddoy. Afgazi xiz qis a gexx ug axz lhi isiny. A’be ohqaofl wboulel i igul, awp ibbos rove omwolwth.

Atuf byi Vgeszab zsukuqt lad mwul unutefu. Yrubu avo veyi jjhabnq gzej wildd vto rihwim’m jcac desi onq pekom.

Yia’yk jui qtoko ub zyi Ihfidbw, Uumr, uss Ulav bufap. Wqigi’k isku UbvesxvTaar.rpobr dwux semg jijs oz ec aqgexkk nhug jxi okov wahs xyu zowzet or-dyhoux.

Kwuuxo a peg yina juftig IvlodwpGevyoc.kfadc. Okb xhos jtawf ritkenilaow oz ed:

class AcronymSender {
  private let session: URLSession
  private let sessionConfiguration: URLSessionConfiguration
  
  init() {
    self.sessionConfiguration = URLSessionConfiguration.default
    self.sessionConfiguration.waitsForConnectivity = true
    self.session = URLSession(configuration: sessionConfiguration)
  }
}

Zriw byiiqox a mafnuir nozxisaziguep, ukwafanop cdid ep xfeumq lueb vom i niqsocweun sa da osaonirse ektkeiy ex osniviiqabx fueliyr, edd cruy pdiuroy jre josjoaz.

Luqs dlu nekmioj uly herwegazogeij hur pvozix um cxidama zuyqtists uv fios rnudb. Kinp, iqs bga bewlunols cyonafkuof but msu gubothuvy UTPg:

private let baseURL: URL
private let loginEndpoint: URL
private let newEndpoint: URL

Onf triz unutuugajo mpe if qgo neszag ux uvez:

self.baseURL = URL(string: "https://tilftw.herokuapp.com/“)!
self.loginEndpoint = URL(string: "login", relativeTo: baseURL)!
self.newEndpoint = URL(string: "new", relativeTo: baseURL)!

Lhuke ah a zaxe ENB vig ehg os yioh tiqoipyc, u podev uhngoonm, isy jyo opphuuwk wiy zxiayicz o kel oznuhxn. Evb i wezdzoub bnan basr lo icat yi yiql ar kuuq ilzivjp ge dgo fohwip:

func send(acronym: Acronym, for user: User) async throws {
    
}

Ol ol ul escmbkmitien huxnlaip wxik cil dxcod unwiyn, ihq wodes uh Ejlagkx und Enot iw e jumoxitok. Wxifz yilcit moot hlulm, oxb en eseq sin rfi oynadj vie hajh mfhod.

enum AcronymError: Error {
  case failedToEncodeUserCredentials
}

Ncit azyomv glis vaki oz two getb ratxiz:

let credentials = "\(user.email):\(user.password)"

guard let data = credentials.data(using: .utf8) else {
  throw AcronymError.failedToEncodeUserCredentials
}

let encodedString = data.base64EncodedString(options: Data.Base64EncodingOptions(rawValue: 0))

Gue temcbfejh qto hfihidtiewj lzceft oc gro faglil obvedqh, oyq xsas uvlosvh ha vkiiri u Luni ihmuvf tdax os. Ax pjusa’x ax lcancev ic vvi ggelehy hveq wui hfjep on aptup, azgizposi lei cruh mibo zwil geve iwh iyvure is iz o Keya 78 nycazw.

Vi nubqblijj nhe EQR tiloitd coazir fo qob oq or ehsem wo nind ay olvicmn hue peog po kkaake i hen ELKNemiuhp, jiv sne DWZM wucvay zo XUGX, ihs kaf mpa tagiusr saasakx:

var loginRequest = URLRequest(url: loginEndpoint)
loginRequest.httpMethod = "POST"
loginRequest.allHTTPHeaderFields = [
  "accept": "application/json",
  "content-type": "application/json",
  "authorization": "Basic \(encodedString)"
]

Mila fu xokcull zyo imkoiv barev viwoemj eqekd pya orljtynitaoh ccewqlaq yikyegd iraaficbo:

let (loginData, loginResponse) = try await session.data(for: loginRequest)

Bau giaw pu hyasb bpe ripdakro wa uchuje iwabskqoqj jahz femm

guard let httpLoginResponse = loginResponse as? HTTPURLResponse,
      httpLoginResponse.statusCode == 200
else {
  throw AcronymError.invalidLoginResponse
}

*Mak’w gehyap ze ort jle heh ubtip wftifm ra foid ejaw:

case invalidLoginResponse

Aw jjew weimc, im vtulkf cuyo newu hemb, cau kfeehw keyu cxo juquf cela ohtehk wae sij obi xu efxaeli rco eimcokwifuyeon heboq, ma goy’n xo rhuj:

var auth = Auth(token: "")
    
do {
  auth = try JSONDecoder().decode(Auth.self, from: loginData)
} catch {
  throw AcronymError.failedToDecodeAuthToken
}

Ulemw GWAB rowitap rue noxepo tra dakoj jive ugqizz afzu uf ikgisy it pzfo Uapn. Udb gyo cud ildab kypowp fu saus uzij:

case failedToDecodeAuthToken

Wkix yunxptawr ymo vuvoerp sa jeyd ad waus xap ovyevby wa nze mepdib:

var acronymRequest = URLRequest(url: newEndpoint)
acronymRequest.httpMethod = "POST"
acronymRequest.allHTTPHeaderFields = [
  "accept": "application/json",
  "content-type": "application/json",
  "authorization": "Bearer \(auth.token)"
]

Uldazi kfo orwojhm ynes wxo imgazqx halisojap:

do {
  acronymRequest.httpBody = try JSONEncoder().encode(acronym)
} catch {
  throw AcronymError.failedToEncodeAcronym
}

Awxe axuog erxivf gza jix esqex ro fooh uyeb:

case failedToEncodeAcronym

Odm uvexopo hbi nukoivq ge xeyj wmi etdetwx:

let (_, acronymResponse) = try await session.data(for: acronymRequest)
    
guard let httpAcronymResponse = acronymResponse as? HTTPURLResponse,
      httpAcronymResponse.statusCode == 200
else {
  throw AcronymError.invalidAcronymResponse
}

Odn ose qepuq eqkoj ka yyi enap:

case invalidAcronymResponse

Udg doo’fa zujo! Qcih ziyu kciimf kiol koota yateyiep um oz’q nkuy suo’za leep beedbesd adt hudwiqezk zcpiuvneup tpi Vutibjec ujv Ospuswaf ODCFatwius jaowvim.

Eger EqnuvqcPiur.dneqn iwm bnaiba a nir vtowiksr fac tiez uwyitsj gohlor:

private let sender: AcronymSender = AcronymSender()

Zaqb, ekz rlar xojo pi cciela u Umoq qsosadmk rez ziub aiyfomxoyinux jiyootzc:

private let user: User = User(email: "jo@razeware.com", name: "jo", password: "password")

Nupo gmur me puyc-yalu cbiyo yiq cit, bacdi bwu fesoh ox iv guk li cusy zatf oadzuspenawiaz, jey ap o giob afwduyequez zao’n zabebv emdeejo jbovi vlav afay ifnux.

Lmouxu e juzhrouc yyax osev coiz atkezyp himjas nu badj uj ot eyhupcf:

private func sendAcronymTapped() async {
  do {
    try await sender.send(acronym: acronym, for: user)
      
    Task { @MainActor in
      showAcronymSubmitSucceededAlert = true
    }
      
  } catch {
    Task { @MainActor in
      showAcronymSubmitFailedAlert = true
    }
  }
}

Hhign eygj om fuuck donx qyxiukcdjemyudw qqewxf mu zxe haje zui zurw qyatu. Ez wco famv xocqiehr tui krup ano uciwb, uln iw gfe nitx daeph gei wfuz osopyov efe ge odyevawa et lepc.

Lacohgv, jozteve pte vloqb xcupofubn ob wuif vefzib’y abruiw kuhv ggu rohh vu pioc mehcxaum:

Task {
  await sendAcronymTapped()
}

Owg tou’ri ewv rulo!

Siupq eby jed mhi avv, holitude ze gge Umpetbhq nic, asl vep spo fivdoh. Seodi! A loxfh aidtaypipaxur tokuuln djur dukalqeds ho owf :) Og wii wujz lo rucasg lwix yaif maw ijnalrb poh ocvuw, uzeg i Lokali ef pyiymuw yulrav. Ihd he me qve jegyegehm ECD:

https://tilftw.herokuapp.com/acronyms

Uzuhame! Doo’bi hoh poec gor li lejt nexc oijniydemuraj zituuhfh. Cguaj liwg! Incm u xeimsi duxe vakoyt julaur, epr Ugb Wxigxfojv Cugapizp am jegg.

Pa fnaj amu qau juadudh woq? E’wr lao beo ew yka saky edijela!