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Steve L.32's avatar
Steve L.32
Explorer | Level 4
9 years ago
Solved

Dropbox authentication on iPhone X

My App's Dropbox authentication is failing on iPhone X and iOS 11. I still do not know the root cause and am just doing an initial inquiry here to learn if there is a known issue.  What I can say is ...
API
  • Greg-DB's avatar
    Greg-DB
    9 years ago
    Thanks for digging in and tracking this down already! I'm glad to hear you figured this out. Calling authorizeFromController twice would indeed cause this. Enforcing a single call is the right thing to do given the unexpected viewDidAppear behavior.
Steve L.32's avatar
Steve L.32
Explorer | Level 4
9 years ago

Wasn't finished with last post, continuing:

 

I assume the real problem is that extractfromDAuthURL:url is called twice and thus the stored nonce doesn't match the current nonce. Also, I munged the redaction in the log entries previously, so here they are again.

 

 

2017-11-11 17:32:29.380496-0500 Krypton[3454:894607] DBSDKReachability Flag Status: -R ------- networkStatusForFlags
2017-11-11 17:32:30.189937-0500 Krypton[3454:894607] didEnterBackground
2017-11-11 17:32:30.205156-0500 Krypton[3454:894607] DBSDKReachability Flag Status: -R ------- networkStatusForFlags
2017-11-11 17:32:30.532935-0500 Krypton[3454:894607] [Snapshotting] Snapshotting a view (0x104005c00, UIKeyboardImpl) that is not in a visible window requires afterScreenUpdates:YES.
2017-11-11 17:32:31.573593-0500 Krypton[3454:894607] willEnterForeground
2017-11-11 17:32:31.590287-0500 Krypton[3454:894607] in viewwillappear call randomizecombination
2017-11-11 17:32:31.646979-0500 Krypton[3454:894607] handling URL: db-***://1/connect?oauth_token_secret=***&state=oauth2%3A9C3186A0-0DAF-48F3-8D70-F98E86DBE839&uid=***&oauth_token=oauth2%3A
2017-11-11 17:32:31.647129-0500 Krypton[3454:894607] stored nonce: 9B60EAE8-003D-40D6-AEF7-4BC8620372C8
2017-11-11 17:32:31.647267-0500 Krypton[3454:894607] Auth Error: Error:[ErrorType: 6 ErrorDescription: Unable to verify link request.]
2017-11-11 17:32:31.648096-0500 Krypton[3454:894607] handling URL: db-***://1/connect?oauth_token_secret=***&state=oauth2%3A9C3186A0-0DAF-48F3-8D70-F98E86DBE839&uid=***&oauth_token=oauth2%3A
2017-11-11 17:32:31.648217-0500 Krypton[3454:894607] stored nonce: 9B60EAE8-003D-40D6-AEF7-4BC8620372C8
2017-11-11 17:32:31.648301-0500 Krypton[3454:894607] Auth Error: Error:[ErrorType: 6 ErrorDescription: Unable to verify link request.]

Thus we see that the stored nonce is not the same as what's presented in the URL.  This is on iPhone X only, on iPad Air 2 those data match and authentication succeeds.  I will continue to see if I've broken my own code with iPhone X mods, but it's not obvious that they could have any impact ... famous last words, eh?!

 

Again, I see the log message DBSDKReachability twice for iPhone X but once for iPad.  I also see the call to extractfromDAuthURL:url twice for iPhone X but only once for iPad.

 

And NOW I figured it out: for iPhone X I am calling authorizeFromController:controller:openURL  twice! When I artificially limit the call to just once authentication works. The call in inside viewDidAppear:animated. For iPad the view must not disappear when the Dropbox App is run, but for iPhone X there is a second call to viewDidAppear:animated which I do not understand.

 

Now off to grok some more on what to do ....

 

Thanks!

 

Greg-DB's avatar
Greg-DB
Icon for Dropbox Community Moderator rankDropbox Community Moderator
9 years ago
Thanks for digging in and tracking this down already! I'm glad to hear you figured this out. Calling authorizeFromController twice would indeed cause this. Enforcing a single call is the right thing to do given the unexpected viewDidAppear behavior.
  • Steve L.32's avatar
    Steve L.32
    Explorer | Level 4
    9 years ago

    I've restructured the Dropbox authentication flow slightly in light of the iPhone / iPad differences I found. I’ve used Dropbox in this App since 2011, so I’m surprised I didn’t see this issue earlier, although I must note that the viewDidAppear:animated code was added 2017.05.22 - this was my great API 1 --> API 2 commit!  This Dropbox App vs. Dropbox web authentication issue might have really existed for the last 6 months and I never noticed it.  I’ll have a definitive answer whenever I can borrow a non-iPhone X and see if viewDidAppear:animated is invoked once or twice.

     

    Thanks again for your help.

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