Escaping the Mac App Store Sandbox (or at least a small part of it)
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The document discusses escaping part of the Mac App Sandbox by using File Presenters. File Presenters allow sandboxed apps to work with temporary files on disk in a multi-threaded environment. The author implements a File Presenter class to enable "Related Items" functionality for a sandboxed app, allowing it to process temporary files related to files selected by the user. Setting up the Xcode target correctly registers the app's support for File Presenters and temporary related items.
![WRFilePresenter
// WRFilePresenter.m
// Bearings
//
// Created by Matt Welch on 3/17/14.
//
#import "WRFilePresenter.h"
@implementation WRFilePresenter
{
NSOperationQueue* queue;
NSURL* pFileURL;
NSURL* tFileURL;
}
- (id) init {
self = [super init];
if (self) {
queue = [NSOperationQueue new];
[NSFileCoordinator addFilePresenter:self];
}
return self;
}
- (NSURL*) primaryPresentedItemURL {
return pFileURL;
}
- (NSURL *) presentedItemURL {
return tFileURL;
}
- (NSOperationQueue*) presentedItemOperationQueue {
return queue;
}
-(void) setURLs:(NSURL*)url {
pFileURL=url;
NSString *fURLS=[url absoluteString];
NSString *fURLSt=[NSString stringWithFormat:@"%@%@",fURLS,@"_temp_file_extension" ];
NSURL *surl = [NSURL URLWithString:fURLSt];
tFileURL=surl;
}
@end](https://image.slidesharecdn.com/cocoaheadsmayfilepresenters-140619164525-phpapp01/85/Escaping-the-Mac-App-Store-Sandbox-or-at-least-a-small-part-of-it-16-320.jpg)
![Implemen'ng)File)Presenters
Given&a&file&with&a&url&of&realFileURL,&implement&a&presenter&for&
it:
WRFilePresenter *filePresenter=[[WRFilePresenter alloc] init];
[filePresenter setURLs:realFileURL];
And$we're$all$set$(at$least$as$far$as$code$is$concerned).](https://image.slidesharecdn.com/cocoaheadsmayfilepresenters-140619164525-phpapp01/85/Escaping-the-Mac-App-Store-Sandbox-or-at-least-a-small-part-of-it-17-320.jpg)
Escaping the Mac App Store Sandbox (or at least a small part of it)
- 3. Bearings
- 15. Implemen'ng)File)Presenters)for)Related) Items Create&a&class&that&conforms&the&the&NSFilePresenter&protocol.& Implement&these&methods: 1. primaryPresentedItemURL#–#The#URL#for#the#original#file 2. primaryItemURL#–#the#URL#for#the#temporary#file#(the#same#as# above,#but#with#different#extension) 3. presentedItemOperationQueue#–#the#queue#on#which#the# app#will#perform#file#presentaGon#tasks
- 16. WRFilePresenter // WRFilePresenter.m // Bearings // // Created by Matt Welch on 3/17/14. // #import "WRFilePresenter.h" @implementation WRFilePresenter { NSOperationQueue* queue; NSURL* pFileURL; NSURL* tFileURL; } - (id) init { self = [super init]; if (self) { queue = [NSOperationQueue new]; [NSFileCoordinator addFilePresenter:self]; } return self; } - (NSURL*) primaryPresentedItemURL { return pFileURL; } - (NSURL *) presentedItemURL { return tFileURL; } - (NSOperationQueue*) presentedItemOperationQueue { return queue; } -(void) setURLs:(NSURL*)url { pFileURL=url; NSString *fURLS=[url absoluteString]; NSString *fURLSt=[NSString stringWithFormat:@"%@%@",fURLS,@"_temp_file_extension" ]; NSURL *surl = [NSURL URLWithString:fURLSt]; tFileURL=surl; } @end
- 17. Implemen'ng)File)Presenters Given&a&file&with&a&url&of&realFileURL,&implement&a&presenter&for& it: WRFilePresenter *filePresenter=[[WRFilePresenter alloc] init]; [filePresenter setURLs:realFileURL]; And$we're$all$set$(at$least$as$far$as$code$is$concerned).
- 20. Demo
- 22. A"ribu'ons • happiness)from)a)sandbox)1)h2ps://www.flickr.com/photos/ celinesphotographer/326629023/ • App)Sandbox)Design)Guide)1)h2ps://developer.apple.com/ library/mac/documentaIon/Security/Conceptual/ AppSandboxDesignGuide/AboutAppSandbox/ AboutAppSandbox.html • Paperama)1)h2ps://www.flickr.com/photos/kasaa/3103799093/