CallKit, getting access to protected files?

Hello


I'm having an issue with CallKit and PushKit that I would like some feedback on.

The following is happening in my VoIP application


  1. Locked device
  2. PushKit notification wakes up my app
  3. CallKit triggers incoming call UI
  4. User answers call
  5. App needs to read critical files from disk but files are protected


After the user answers the call in step 4 the application needs to read configuration details from the disk, otherwise it cannot into my VoIP backend. But the file system is protected and cannot be accessed before the user launches my app from the CallKit UI.


Am I doing this wrong?

How am I supposed to get access to the protected files? My app doesn't set NSFileProtectionComplete in the entitlements file.

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App needs to read critical files from disk but files are protected

If you need to access files from background code, you should explicitly set the file protection on those files to allow that access. Most folks use 

NSFileProtectionCompleteUntilFirstUserAuthentication
but that may not work for a VoIP app where, IIRC, the VoIP can ‘ring’ before first unlock. If that’s the case, your only option is 
NSFileProtectionNone
.

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