cog/Utils/SandboxBroker.m

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//
// SandboxBroker.m
// Cog
//
// Created by Christopher Snowhill on 6/20/22.
//
#import <Foundation/Foundation.h>
#import <Cocoa/Cocoa.h>
#import "SandboxBroker.h"
#import "Logging.h"
#import "Cog-Swift.h"
#import "PlaylistController.h"
static SandboxBroker *kSharedSandboxBroker = nil;
@interface SandboxEntry : NSObject {
SandboxToken *_token;
NSInteger _refCount;
NSURL *_secureUrl;
NSString *_path;
BOOL _isFolder;
};
@property(readonly) SandboxToken *token;
@property NSURL *secureUrl;
@property(readonly) NSString *path;
@property NSInteger refCount;
@property(readonly) BOOL isFolder;
- (id)initWithToken:(SandboxToken *)token;
@end
@implementation SandboxEntry
- (id)initWithToken:(SandboxToken *)token {
SandboxEntry *obj = [super init];
if(obj) {
obj->_refCount = 1;
obj->_secureUrl = nil;
obj->_token = token;
obj->_path = token.path;
obj->_isFolder = token.folder;
}
return obj;
}
- (NSInteger)refCount {
return _refCount;
}
- (void)setRefCount:(NSInteger)refCount {
_refCount = refCount;
}
- (NSURL *)secureUrl {
return _secureUrl;
}
- (void)setSecureUrl:(NSURL *)url {
_secureUrl = url;
}
- (SandboxToken *)token {
return _token;
}
- (NSString *)path {
return _path;
}
- (BOOL)isFolder {
return _isFolder;
}
@end
@implementation SandboxBroker
+ (id)sharedSandboxBroker {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
kSharedSandboxBroker = [[self alloc] init];
});
return kSharedSandboxBroker;
}
+ (NSPersistentContainer *)sharedPersistentContainer {
return [NSClassFromString(@"PlaylistController") sharedPersistentContainer];
}
+ (NSURL *)urlWithoutFragment:(NSURL *)url {
if(![url isFileURL]) return url;
NSNumber *isDirectory;
BOOL success = [url getResourceValue:&isDirectory forKey:NSURLIsDirectoryKey error:nil];
if(success && [isDirectory boolValue]) return url;
NSString *s = [url path];
NSString *lastComponent = [url fragment];
if(lastComponent) {
lastComponent = @"#";
// Find that last component in the string from the end to make sure
// to get the last one
NSRange fragmentRange = [s rangeOfString:lastComponent
options:NSBackwardsSearch];
// Chop the fragment.
NSString *newURLString = [s substringToIndex:fragmentRange.location + fragmentRange.length];
return [NSURL fileURLWithPath:newURLString];
} else {
return url;
}
}
- (id)init {
id _self = [super init];
if(_self) {
storage = [[NSMutableArray alloc] init];
}
return _self;
}
- (void)shutdown {
for(SandboxEntry *obj in storage) {
if([obj secureUrl]) {
[[obj secureUrl] stopAccessingSecurityScopedResource];
}
}
}
+ (BOOL)isPath:(NSURL *)path aSubdirectoryOf:(NSURL *)directory {
NSArray *pathComponents = [path pathComponents];
NSArray *directoryComponents = [directory pathComponents];
if([pathComponents count] < [directoryComponents count])
return NO;
for(size_t i = 0; i < [directoryComponents count]; ++i) {
if(![pathComponents[i] isEqualToString:directoryComponents[i]])
return NO;
}
return YES;
}
- (SandboxEntry *)recursivePathTest:(NSURL *)url {
SandboxEntry *ret = nil;
NSPersistentContainer *pc = [SandboxBroker sharedPersistentContainer];
NSPredicate *folderPredicate = [NSPredicate predicateWithFormat:@"folder == NO"];
NSPredicate *filePredicate = [NSPredicate predicateWithFormat:@"path == %@", [url path]];
NSPredicate *predicate = [NSCompoundPredicate andPredicateWithSubpredicates:@[folderPredicate, filePredicate]];
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"SandboxToken"];
request.predicate = predicate;
NSError *error = nil;
NSArray *results = [pc.viewContext executeFetchRequest:request error:&error];
if(results && [results count] > 0) {
ret = [[SandboxEntry alloc] initWithToken:results[0]];
}
if(!ret) {
predicate = [NSPredicate predicateWithFormat:@"folder == YES"];
NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"path.length" ascending:NO];
request = [NSFetchRequest fetchRequestWithEntityName:@"SandboxToken"];
request.sortDescriptors = @[sortDescriptor];
request.predicate = predicate;
error = nil;
results = [pc.viewContext executeFetchRequest:request error:&error];
if(results) results = [results copy];
if(results && [results count] > 0) {
for(SandboxToken *token in results) {
if(token.path && [SandboxBroker isPath:url aSubdirectoryOf:[NSURL fileURLWithPath:token.path]]) {
SandboxEntry *entry = [[SandboxEntry alloc] initWithToken:token];
ret = entry;
break;
}
}
}
}
if(ret) {
BOOL isStale;
NSError *err = nil;
NSURL *secureUrl = [NSURL URLByResolvingBookmarkData:ret.token.bookmark options:NSURLBookmarkResolutionWithSecurityScope relativeToURL:nil bookmarkDataIsStale:&isStale error:&err];
if(!secureUrl && err) {
ALog(@"Failed to access bookmark for URL: %@, error: %@", ret.token.path, [err localizedDescription]);
return nil;
}
ret.secureUrl = secureUrl;
return ret;
}
return nil;
}
- (void)addFolderIfMissing:(NSURL *)folderUrl {
if(![folderUrl isFileURL]) return;
@synchronized (self) {
SandboxEntry *_entry = nil;
for(SandboxEntry *entry in storage) {
if(entry.path && entry.isFolder && [SandboxBroker isPath:folderUrl aSubdirectoryOf:[NSURL fileURLWithPath:entry.path]]) {
_entry = entry;
break;
}
}
if(!_entry) {
_entry = [self recursivePathTest:folderUrl];
}
if(!_entry) {
NSError *err = nil;
NSData *bookmark = [folderUrl bookmarkDataWithOptions:NSURLBookmarkCreationWithSecurityScope includingResourceValuesForKeys:nil relativeToURL:nil error:&err];
if(!bookmark && err) {
ALog(@"Failed to add bookmark for URL: %@, with error: %@", folderUrl, [err localizedDescription]);
return;
}
NSPersistentContainer *pc = [NSClassFromString(@"PlaylistController") sharedPersistentContainer];
SandboxToken *token = [NSEntityDescription insertNewObjectForEntityForName:@"SandboxToken" inManagedObjectContext:pc.viewContext];
if(token) {
token.path = [folderUrl path];
token.bookmark = bookmark;
[pc.viewContext save:&err];
if(err) {
ALog(@"Error saving bookmark: %@", [err localizedDescription]);
}
}
}
}
}
- (void)addFileIfMissing:(NSURL *)fileUrl {
if(![fileUrl isFileURL]) return;
NSURL *url = [SandboxBroker urlWithoutFragment:fileUrl];
@synchronized (self) {
SandboxEntry *_entry = nil;
for(SandboxEntry *entry in storage) {
if(entry.path) {
if((entry.isFolder && [SandboxBroker isPath:url aSubdirectoryOf:[NSURL fileURLWithPath:entry.path]]) ||
(!entry.isFolder && [url isEqualTo:[NSURL fileURLWithPath:entry.path]])) {
_entry = entry;
break;
}
}
}
if(!_entry) {
_entry = [self recursivePathTest:url];
}
if(!_entry) {
NSError *err = nil;
NSData *bookmark = [fileUrl bookmarkDataWithOptions:NSURLBookmarkCreationWithSecurityScope includingResourceValuesForKeys:nil relativeToURL:nil error:&err];
if(!bookmark && err) {
ALog(@"Failed to add bookmark for URL: %@, with error: %@", url, [err localizedDescription]);
return;
}
NSPersistentContainer *pc = [NSClassFromString(@"PlaylistController") sharedPersistentContainer];
SandboxToken *token = [NSEntityDescription insertNewObjectForEntityForName:@"SandboxToken" inManagedObjectContext:pc.viewContext];
if(token) {
token.path = [url path];
token.bookmark = bookmark;
token.folder = NO;
[pc.viewContext save:&err];
if(err) {
ALog(@"Error saving bookmark: %@", [err localizedDescription]);
}
}
}
}
}
- (const void *)beginFolderAccess:(NSURL *)fileUrl {
NSURL *folderUrl = [SandboxBroker urlWithoutFragment:fileUrl];
if(![folderUrl isFileURL]) return NULL;
SandboxEntry *_entry = nil;
NSString *sandboxPath = [folderUrl path];
@synchronized(self) {
for(SandboxEntry *entry in storage) {
if(entry.path) {
if((entry.isFolder && [SandboxBroker isPath:folderUrl aSubdirectoryOf:[NSURL fileURLWithPath:entry.path]]) ||
(!entry.isFolder && [entry.path isEqualToString:sandboxPath])) {
entry.refCount += 1;
_entry = entry;
break;
}
}
}
if(!_entry) {
_entry = [self recursivePathTest:folderUrl];
}
if(_entry) {
[storage addObject:_entry];
if(_entry.secureUrl) {
[_entry.secureUrl startAccessingSecurityScopedResource];
}
return CFBridgingRetain(_entry);
} else {
return NULL;
}
}
}
- (void)endFolderAccess:(const void *)handle {
if(!handle) return;
SandboxEntry *entry = CFBridgingRelease(handle);
if(!entry) return;
@synchronized(self) {
if(entry.refCount > 1) {
entry.refCount -= 1;
return;
} else {
if(entry.secureUrl) {
[entry.secureUrl stopAccessingSecurityScopedResource];
entry.secureUrl = nil;
}
entry.refCount = 0;
[storage removeObject:entry];
}
}
}
- (BOOL)areAllPathsSafe:(NSArray *)urls {
for(NSURL *url in urls) {
if(![self recursivePathTest:url]) {
return NO;
}
}
return YES;
}
@end