Firebase authentication: linking multiple accounts in Swift -

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i've set firebase authentication ios app using facebook, google & email/password sign in , it's working fine. authentication happens when user wants access high-priority parts of app (i.e. don't require users sign in start using app).

on app start up, sign users in anonymously in background , that's working fine too.

i've read documentation i'm struggling understand code required enable me link anonymous account facebook/email signed in account in following flow:

  • new user opens app
  • user signed in anonymously in background (new user.uid "a" created)
  • low priority data stored against anonymous user in firebase realtime db
  • user hits high-priority area needs authenticate
  • user signs in using facebook (new user.uid "b" created)
  • previous user.uid "a" needs linked user.uid "b"

my method looks this:

func signupwithfacebook(){     // track anonymous user link later     let prevuser = firauth.auth()?.currentuser      fbsdkloginmanager().loginwithreadpermissions(["public_profile", "email"], fromviewcontroller: self) { (result, error) in         if let token = result?.token?.tokenstring {             let credential = firfacebookauthprovider.credentialwithaccesstoken(token)              firauth.auth()?.signinwithcredential(credential, completion: { (user, error) in                 if user != nil && error == nil {                     // success                     self.success?(user: user!)                     dispatch_async(dispatch_get_main_queue(), {                         self.dismissviewcontrolleranimated(true, completion: nil)                     })                  }             })         }     } }

any pointers remove confusion great.

update: i've realised confused app logic because of users being created during testing. instead of 2 separate users being created above scenario (one authenticated via facebook , anonymously), happens original anonymous user.uid "a" "linked" facebook authentication credentials. in firebase console shown anonymous uid changing anonymous 1 facebook logo next it.

this working method looks like:

func signupwithfacebook(){     fbsdkloginmanager().loginwithreadpermissions(["public_profile", "email"], fromviewcontroller: self) { (result, error) in         if let token = result?.token?.tokenstring {             let credential = firfacebookauthprovider.credentialwithaccesstoken(token)              firauth.auth()?.currentuser!.linkwithcredential(credential) { (user, error) in                 if user != nil && error == nil {                     // success                     self.success?(user: user!)                     dispatch_async(dispatch_get_main_queue(), {                         self.dismissviewcontrolleranimated(true, completion: nil)                     })                 } else {                     print("linkwithcredential error:", error)                 }             }         }     } }

so code follows first 2 steps in this link. documentation explicity says not call signinwithcredential instead call 

firauth.auth()?.currentuser.linkwithcredential(credential) { (user, error) in   // ... }

after getting credential facebook's sdk.

quote link: "if call linkwithcredential:completion: succeeds, user's new account can access anonymous account's firebase data."


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