Facebook Login web page does not redirect to the application at the first login

[iuliiazhelem]

At the first login to Facebook the redirect URL contains "fragment" _=_
For example
com.auth0.akswiftauth0test://juliazhelem.eu.auth0.com/ios/com.auth0.AKSwiftAuth0Test/callback?code=pMmrjQQO7EAQGJmt&state=pg76m1ep6TD0RwYzwrlszuh7bpXjwIBmaxW_NWacZCM#_=_

Auth0.swift analyzes this URL and marks it as “not completed” (Auth0.resumeAuth(url, options: options) returns "false")

For the next logins to Facebook the redirect URL does not contain any fragments and everything works fine

Possible solution:
Function SafariSession.resume(...) does not check "fragment", only "query".
So changing let items = components.a0_values to let items = components.a0_queryValues in file https://github.com/auth0/Auth0.swift/blob/master/Auth0/OAuth2Session.swift#L86 might fix the issue

[hzalaz]

Does it happen with all facebook logins? Not sure that's the proper fix

[iuliiazhelem]

Only with the first login, I mean if you did not login to Facebook on your device before.
In this case URL contains #_=_ and Auth0.resumeAuth(url, options: options) returns "false" (https://github.com/auth0/Auth0.swift/blob/master/Auth0/OAuth2Session.swift#L87) because items are a0_fragmentValues (_, _). But the URL is correct, it contains all necessary information (state, code) in NSURL.query

Also I checked "twitter", "google-oauth2", "linkedin". State and code are in NSURL.query, for these connections URL does not contain NSURL.fragment at all.

https://auth0.com/forum/t/facebook-sign-in-page-doesnt-dismiss-on-first-try-ios/3796