dowloadUrl failing on iOS 16 with NSCocoaErrorDomain Code=513

Question

My app has been using the Objective-C SDK without problem for many years. Currently I am running ObjectiveDropboxOfficial (6.3.2)

My app uses the API to allow the user to browse their Dropbox account and download PDF files.

Now on the iOS 16 beta (beta 3 is the first I've tried), I am getting permission errors like what was reported years ago here, e.g. https://github.com/dropbox/dropbox-sdk-obj-c/issues/125. I have tried setting forceForegroundSession:YES, but it does not fix the issue.  The issue occurs both on the simulator and on a physical device (iPad)

I have included the error message below for completeness.  I would greatly appreciate help with this. My app is essentially useless without working Dropbox capability.

Thanks!

DropboxClientError[{
NSError = "Error Domain=NSCocoaErrorDomain Code=513 "\U201c258D96CC-96B9-4747-A85D-26DE78A98B9E\U201d couldn\U2019t be moved because you don\U2019t have permission to access \U201cSystem\U201d."
UserInfo={NSDestinationFilePath=/%2Fvar%2Fmobile%2FContainers%2FData%2FApplication%2F06070902-D1B0-47D2-80C9-20B6AE5112D7%2FDocuments%2FBetter Word-Eb (LEAD).pdf, NSUserStringVariant=Move,
NSFilePath=/private/var/mobile/Containers/Data/Application/06070902-D1B0-47D2-80C9-20B6AE5112D7/tmp/258D96CC-96B9-4747-A85D-26DE78A98B9E, NSUnderlyingError=0x282dfb2a0 {Error Domain=NSCocoaErrorDomain Code=513 "\U201c258D96CC-96B9-4747-A85D-26DE78A98B9E\U201d couldn\U2019t be copied because you don\U2019t have permission to access \U201cSystem\U201d." UserInfo={NSSourceFilePathErrorKey=/private/var/mobile/Containers/Data/Application/06070902-D1B0-47D2-80C9-20B6AE5112D7/tmp/258D96CC-96B9-4747-A85D-26DE78A98B9E, NSUserStringVariant=(
 Copy
), NSDestinationFilePath=/%2Fvar%2Fmobile%2FContainers%2FData%2FApplication%2F06070902-D1B0-47D2-80C9-20B6AE5112D7%2FDocuments%2FBetter Word-Eb (LEAD).pdf, NSFilePath=/private/var/mobile/Containers/Data/Application/06070902-D1B0-47D2-80C9-20B6AE5112D7/tmp/258D96CC-96B9-4747-A85D-26DE78A98B9E, NSUnderlyingError=0x282dfae50 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}}}";

skantner · Accepted Answer

Problem is resolved. I pasted the sample code you mentioned into a test method, and it worked fine. I think it boiled down to a poorly formed URL that for some reason has worked for years prior to iOS 16.  Thank you for pointing me in this direction!

Old code working before IOS 16:

NSString *tgtFile = @Alive-E (SCORE).pdf;

NSString *sharedDocs="/Users/scott/Library/Developer/CoreSimulator/Devices/E2E5C99C-FC57-4078-AC3F-D5CCDA5668D1/data/Containers/Data/Application/ECFFFC6E-5F47-47CB-830A-B07CDCA07B71/Documents";

NSString *targetPath = [[NSString alloc] initWithFormat:@%@",[sharedDocs stringByAppendingPathComponent:tgtFile]];

NSURL *targetURL = [NSURL URLWithString:[targetPath stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLHostAllowedCharacterSet]]];

(lldb) p targetURL =

@%2FUsers%2Fscott%2FLibrary%2FDeveloper%2FCoreSimulator%2FDevices%2FE2E5C99C-FC57-4078-AC3F-D5CCDA5668D1%2Fdata%2FContainers%2FData%2FApplication%2FECFFFC6E-5F47-47CB-830A-B07CDCA07B71%2FDocuments%2FAlive-E%20(SCORE).pdf

New code, based on the code sample:

NSFileManager *fileManager = [NSFileManager defaultManager];

NSURL *outputDirectory = [fileManager URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask][0];

NSURL *targetURL = [outputDirectory URLByAppendingPathComponent:tgtFile];

(lldb) p targetURL

@file:///Users/scott/Library/Developer/CoreSimulator/Devices/E2E5C99C-FC57-4078-AC3F-D5CCDA5668D1/data/Containers/Data/Application/ECFFFC6E-5F47-47CB-830A-B07CDCA07B71/Documents/Alive-E%20(SCORE).pdf