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gcarl's avatar
gcarl
Explorer | Level 4
3 years ago

Re: Tokens only valid for 4 hours from app console

Dear greg-DB,

 

sorry, but I have to come back to this topic again, since I couldn't solve it in the recent weeks despite all these valuable hints in this forum and the description for the Swift SDK.

 

I'm writing an app with Swift and I originally set it up with a long-term token, which was changed by Dropbox in the meantime.

 

I do the setup in the appDelegate with (dropboxAppKey is the key I created  in the Dropbox-portal for my App)

 

 

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        UIApplication.shared.registerForRemoteNotifications()
        DropboxClientsManager.setupWithAppKey(dropboxAppKey) 
...
}

 

 

 

and I'm doing the connect as decribed with 

 

 

func connectDropbox() {
        let scopeRequest = ScopeRequest(scopeType: .user, scopes: ["files.content.write", "files.content.read", "account_info.read"], includeGrantedScopes: false)
            DropboxClientsManager.authorizeFromControllerV2(
                UIApplication.shared,
                controller: self,
                loadingStatusDelegate: nil,
                openURL: { (url: URL) -> Void in UIApplication.shared.open(url, options: [:], completionHandler: nil) },
                scopeRequest: scopeRequest
            )
    }
    

 

 

and as described in appDelegate with:

 

 

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
        let oauthCompletion: DropboxOAuthCompletion = {
          if let authResult = $0 {
              switch authResult {
              case .success:
                  print("Success! User is logged into DropboxClientsManager.")
              case .cancel:
                  print("Authorization flow was manually canceled by user!")
              case .error(_, let description):
                  print("Error: \(String(describing: description))")
              }
          }
        }
        let canHandleUrl = DropboxClientsManager.handleRedirectURL(url, completion: oauthCompletion)
        return canHandleUrl
    }

 

 respectively as described in the SDK for the SceneDelegate.

 

Everything works fine and I can access data from and save data to the Dropbox for a certain while (it seems to be even less than 4 hours) and then out of a sudden the connection is interrupted. 

 

Within my app I check the availability of the dropbox before saving or retrieving data with:

 

if let client = DropboxClientsManager.authorizedClient {
                         dropboxClient = client
                         dropboxClient!.files.download(path: ... )
                             .response { response, error in
                                 if let response = response {
                                     let _ = response.0
                                     let fileContents = response.1
                                     <code>
                                 } else if let error = error {
                                     switch error as CallError {
                                     case .routeError:
                                        <code>
                                     default:
                                        <code>
                                         return
                                     }
                                 }
                             }
                     }

 

 

Unfortunately, I can't manage the described automatic refresh for my app. Is there a certain coding I have to call if the above mentioned availability-check ("if let client = DropboxClientsManager.authorizedClient ") provides nil?

 

Thanks for your support

  • Greg-DB's avatar
    Greg-DB
    Icon for Dropbox Staff rankDropbox Staff

    Can you elaborate on what you mean when you say "the connection is interrupted"? Do you get a particular error? If so, please share it here. Or, do you mean that DropboxClientsManager.authorizedClient just becomes nil at that point?

    • gcarl's avatar
      gcarl
      Explorer | Level 4

      Dear Greg-DB,

       

      it is the latter one - I get the "nil" as response in the availability check. I understood the whole discussion that this shouldn't be the case and the refresh should happen automatically via the refresh token in the background instead. Is this correct?

       

      Thanks for the support

      • Greg-DB's avatar
        Greg-DB
        Icon for Dropbox Staff rankDropbox Staff

        Thanks for clarifying. That's correct, the refresh process should be handled for you automatically as long as you've processed the authorization flow using authorizeFromControllerV2.

         

        Even if you did only have a short-lived access token stored though, or if the refresh process failed and the SDK wasn't able to get a new short-lived access token, you would still have the expired access token stored so you would have a non-nil authorizedClient and should get back a specific error like 'expired_access_token' when attempting a call.

         

        So, from your description, with the issue occurring sooner than four hours, and with authorizedClient itself being nil, it sounds like the issue isn't actually with the access token expiration itself. It seems as if the token isn't being persisted successfully. The SDK uses the system's keychain functionality to store and retrieve the tokens.

         

        Does the authorizedClient seem to get lost after any particular event, such as when the app (or device) is restarted?

         

        Does this happen on multiple different devices? (I've occasionally heard of issues with the keychain not working properly on specific devices.)

         

        Do you perhaps get any error/output during the authorizeFromControllerV2/handleRedirectURL flow?

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