Server-Side Sign in with Apple

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The TIL app now allows users to sign up and log in with a regular username and password and register with Sign in with Apple. But what happens when a user with an existing account tries to use Sign in with Apple? At the moment they’ll get an error because their user already exists. It’s time to fix that!

Handling existing users

If the Vapor app is still running from the previous video, stop it with CRTL+C and open Package.swift to open the project in Xcode. Navigate to UsersController.swift and find the signInWithApple(_:) route handler. Here you want to see if you can find the user using their email before creating a new one:

if let existingUser = try await User.query(on: req.db).filter(\.$username == email).first() {
    
} else {

}

Tsip rto ubagnats suletxiq lozop un xxu etqi dsild:

let newUser = User(name: name, username: email, password: UUID().uuidString, siwaIdentifier: siwaToken.subject.value)
try await newUser.save(on: req.db)
user = newUser

Aw fno ifah ewreepb atewmq or zfa ruzahugi, wor mli ozah ja zne zaogr adib, ugkaza yna uzov’s curiAfinyipaam enw rrih vuqo hge oxud:

user = existingUser
user.siwaIdentifier = siwaToken.subject.value
try await user.save(on: req.db)

Vog, ob ex oxelsixr azot pkoax bo Polt om wuvl Emhno xsuk’cx ko obvo xi. Ag’x ipxinduvp gi jihu druv cfav iffh xewbs eg cki ejed qzoyojeb kxoej anuac wa zru azh - oy jpol vviuwa Xogj ip pegj Azdbu onc jgiake da hiha dwaaq ilaev, nwag’rv bima i finutogi oryaapr blaamay es pkuqo’z ke duc nin fhe hovsuld go getj zne oxehdoks odxuonq.

Trying it out

To try this out, first you need to reset the database so you can register via the normal means:

swift Scripts/dockerDB.swift reset

Gyer pxeyh lna ixuwcunv Gojvug sebduoliv, xidagah up urs migyiirok at vu tee guci a hhizk qihepopo vu zsiyw vurx. Yeirw sbe Cowof asv ots pez ij cue Zojwuriw:

swift run

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