Code used in Find Any File to test whether Full Disk Access is enabled

hasFullDiskAccess.m

+ (BOOL)hasFullDiskAccess
{
	if (@available(macOS 10.14, *)) {
		// fall thru
	} else {
		return YES;	// always true pre-10.14
	}
	
	//
	// The following code was kindly provided by Pierre Bernard, author of AccessKit, Tembo and HoudahSpot
	//
	static NSArray			*directoriesToCheck = nil;
	static dispatch_once_t	onceToken;

	dispatch_once(&onceToken, ^{
		NSArray *directoryPaths = @[
			@"~/Library/Application Support/com.apple.TCC/",
			@"~/Library/Containers/com.apple.mail/",
			@"~/Library/Containers/com.apple.Safari/",
			@"~/Library/Cookies/",
			@"~/Library/Mail/",
			@"~/Library/Messages/",
			@"~/Library/Metadata/CoreSpotlight/",
			@"~/Library/Safari/"
		];

		NSMutableArray *expandedPaths = [NSMutableArray arrayWithCapacity:[directoryPaths count]];

		for (NSString *path in directoryPaths) {
			NSString *expandedPath = [[path stringByExpandingTildeInPath] stringByStandardizingPath];
			[expandedPaths addObject:expandedPath];
		}

		directoriesToCheck = [expandedPaths copy];
	});

	NSFileManager *fileManager = [NSFileManager defaultManager];
	BOOL directoryExists = NO;

	for (NSString *directoryPath in directoriesToCheck) {
		BOOL isDirectory;
		if (![fileManager fileExistsAtPath:directoryPath isDirectory:&isDirectory]) continue;
		if (!isDirectory) continue;

		directoryExists = YES;

		NSError *error;
		NSArray *contents = [fileManager contentsOfDirectoryAtPath:directoryPath error:&error];
		if (contents == nil) {
			NSError *underlyingError = error.userInfo[NSUnderlyingErrorKey];
			if ([underlyingError.domain isEqualToString:NSPOSIXErrorDomain] && (underlyingError.code == 1 /* operation not permitted */)) {
				return NO;
			}
		}
	}

	return directoryExists;
}