501 lines
13 KiB
Objective-C
501 lines
13 KiB
Objective-C
//
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// SandboxBroker.m
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// Cog
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//
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// Created by Christopher Snowhill on 6/20/22.
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//
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#import <Foundation/Foundation.h>
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#import <Cocoa/Cocoa.h>
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#import "SandboxBroker.h"
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#import "Logging.h"
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#import "Cog-Swift.h"
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#import "PlaylistController.h"
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static SandboxBroker *kSharedSandboxBroker = nil;
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@interface SandboxEntry : NSObject {
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SandboxToken *_token;
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NSInteger _refCount;
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NSURL *_secureUrl;
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NSString *_path;
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BOOL _isFolder;
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};
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@property(readonly) SandboxToken *token;
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@property NSURL *secureUrl;
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@property(readonly) NSString *path;
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@property NSInteger refCount;
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@property(readonly) BOOL isFolder;
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- (id)initWithToken:(SandboxToken *)token;
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@end
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@implementation SandboxEntry
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- (id)initWithToken:(SandboxToken *)token {
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SandboxEntry *obj = [super init];
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if(obj) {
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obj->_refCount = 1;
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obj->_secureUrl = nil;
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obj->_token = token;
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obj->_path = token.path;
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obj->_isFolder = token.folder;
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}
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return obj;
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}
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- (NSInteger)refCount {
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return _refCount;
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}
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- (void)setRefCount:(NSInteger)refCount {
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_refCount = refCount;
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}
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- (NSURL *)secureUrl {
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return _secureUrl;
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}
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- (void)setSecureUrl:(NSURL *)url {
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_secureUrl = url;
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}
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- (SandboxToken *)token {
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return _token;
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}
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- (NSString *)path {
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return _path;
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}
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- (BOOL)isFolder {
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return _isFolder;
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}
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@end
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@implementation SandboxBroker
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+ (id)sharedSandboxBroker {
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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kSharedSandboxBroker = [[self alloc] init];
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});
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return kSharedSandboxBroker;
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}
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+ (NSLock *)sharedPersistentContainerLock {
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return [NSClassFromString(@"PlaylistController") sharedPersistentContainerLock];
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}
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+ (NSPersistentContainer *)sharedPersistentContainer {
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return [NSClassFromString(@"PlaylistController") sharedPersistentContainer];
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}
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+ (NSURL *)urlWithoutFragment:(NSURL *)url {
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if(![url isFileURL]) return url;
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NSString *s = [url path];
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NSRange fragmentRange = [s rangeOfString:@"#"
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options:NSBackwardsSearch];
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if(fragmentRange.location != NSNotFound) {
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// Chop the fragment.
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NSString *newURLString = [s substringToIndex:fragmentRange.location];
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return [NSURL fileURLWithPath:newURLString];
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} else {
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return url;
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}
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}
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- (id)init {
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id _self = [super init];
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if(_self) {
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storage = [[NSMutableArray alloc] init];
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}
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return _self;
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}
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- (void)shutdown {
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for(SandboxEntry *obj in storage) {
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if([obj secureUrl]) {
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[[obj secureUrl] stopAccessingSecurityScopedResource];
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}
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}
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}
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+ (BOOL)isPath:(NSURL *)path aSubdirectoryOf:(NSURL *)directory {
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NSArray *pathComponents = [path pathComponents];
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NSArray *directoryComponents = [directory pathComponents];
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if([pathComponents count] < [directoryComponents count])
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return NO;
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for(size_t i = 0; i < [directoryComponents count]; ++i) {
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if(![pathComponents[i] isEqualToString:directoryComponents[i]])
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return NO;
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}
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return YES;
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}
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- (SandboxEntry *)recursivePathTest:(NSURL *)url {
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SandboxEntry *ret = nil;
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NSLock *lock = [SandboxBroker sharedPersistentContainerLock];
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NSPersistentContainer *pc = [SandboxBroker sharedPersistentContainer];
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NSPredicate *folderPredicate = [NSPredicate predicateWithFormat:@"folder == NO"];
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NSPredicate *filePredicate = [NSPredicate predicateWithFormat:@"path == %@", [url path]];
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NSPredicate *predicate = [NSCompoundPredicate andPredicateWithSubpredicates:@[folderPredicate, filePredicate]];
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NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"SandboxToken"];
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request.predicate = predicate;
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NSError *error = nil;
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[lock lock];
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NSArray *results = [pc.viewContext executeFetchRequest:request error:&error];
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[lock unlock];
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if(results && [results count] > 0) {
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ret = [[SandboxEntry alloc] initWithToken:results[0]];
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}
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if(!ret) {
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predicate = [NSPredicate predicateWithFormat:@"folder == YES"];
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NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"path.length" ascending:NO];
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request = [NSFetchRequest fetchRequestWithEntityName:@"SandboxToken"];
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request.sortDescriptors = @[sortDescriptor];
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request.predicate = predicate;
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error = nil;
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[lock lock];
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results = [pc.viewContext executeFetchRequest:request error:&error];
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[lock unlock];
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if(results && [results count] > 0) {
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for(SandboxToken *token in results) {
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if(token.path && [SandboxBroker isPath:url aSubdirectoryOf:[NSURL fileURLWithPath:token.path]]) {
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SandboxEntry *entry = [[SandboxEntry alloc] initWithToken:token];
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ret = entry;
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break;
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}
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}
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}
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}
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if(ret) {
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BOOL isStale;
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NSError *err = nil;
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NSURL *secureUrl = [NSURL URLByResolvingBookmarkData:ret.token.bookmark options:NSURLBookmarkResolutionWithSecurityScope relativeToURL:nil bookmarkDataIsStale:&isStale error:&err];
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if(!secureUrl && err) {
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ALog(@"Failed to access bookmark for URL: %@, error: %@", ret.token.path, [err localizedDescription]);
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return nil;
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}
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ret.secureUrl = secureUrl;
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return ret;
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}
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return nil;
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}
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static inline void dispatch_sync_reentrant(dispatch_queue_t queue, dispatch_block_t block) {
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if(dispatch_queue_get_label(queue) == dispatch_queue_get_label(DISPATCH_CURRENT_QUEUE_LABEL)) {
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block();
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} else {
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dispatch_sync(queue, block);
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}
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}
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- (void)addFolderIfMissing:(NSURL *)folderUrl {
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if(![folderUrl isFileURL]) return;
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@synchronized (self) {
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SandboxEntry *_entry = nil;
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for(SandboxEntry *entry in storage) {
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if(entry.path && entry.isFolder && [SandboxBroker isPath:folderUrl aSubdirectoryOf:[NSURL fileURLWithPath:entry.path]]) {
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_entry = entry;
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break;
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}
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}
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if(!_entry) {
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_entry = [self recursivePathTest:folderUrl];
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}
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if(!_entry) {
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NSError *err = nil;
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NSData *bookmark = [folderUrl bookmarkDataWithOptions:NSURLBookmarkCreationWithSecurityScope includingResourceValuesForKeys:nil relativeToURL:nil error:&err];
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if(!bookmark && err) {
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ALog(@"Failed to add bookmark for URL: %@, with error: %@", folderUrl, [err localizedDescription]);
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return;
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}
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dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
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NSLock *lock = [SandboxBroker sharedPersistentContainerLock];
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NSPersistentContainer *pc = [SandboxBroker sharedPersistentContainer];
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[lock lock];
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SandboxToken *token = [NSEntityDescription insertNewObjectForEntityForName:@"SandboxToken" inManagedObjectContext:pc.viewContext];
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[lock unlock];
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if(token) {
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token.path = [folderUrl path];
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token.bookmark = bookmark;
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[SandboxBroker cleanupFolderAccess];
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}
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});
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}
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}
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}
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- (void)addFileIfMissing:(NSURL *)fileUrl {
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if(![fileUrl isFileURL]) return;
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NSURL *url = [SandboxBroker urlWithoutFragment:fileUrl];
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@synchronized (self) {
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SandboxEntry *_entry = nil;
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for(SandboxEntry *entry in storage) {
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if(entry.path) {
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if((entry.isFolder && [SandboxBroker isPath:url aSubdirectoryOf:[NSURL fileURLWithPath:entry.path]]) ||
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(!entry.isFolder && [url isEqualTo:[NSURL fileURLWithPath:entry.path]])) {
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_entry = entry;
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break;
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}
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}
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}
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if(!_entry) {
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_entry = [self recursivePathTest:url];
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}
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if(!_entry) {
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NSError *err = nil;
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NSData *bookmark = [fileUrl bookmarkDataWithOptions:NSURLBookmarkCreationWithSecurityScope includingResourceValuesForKeys:nil relativeToURL:nil error:&err];
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if(!bookmark && err) {
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ALog(@"Failed to add bookmark for URL: %@, with error: %@", url, [err localizedDescription]);
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return;
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}
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NSLock *lock = [SandboxBroker sharedPersistentContainerLock];
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NSPersistentContainer *pc = [SandboxBroker sharedPersistentContainer];
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dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
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[lock lock];
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SandboxToken *token = [NSEntityDescription insertNewObjectForEntityForName:@"SandboxToken" inManagedObjectContext:pc.viewContext];
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[lock unlock];
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if(token) {
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token.path = [url path];
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token.bookmark = bookmark;
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token.folder = NO;
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}
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});
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}
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}
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}
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- (void)requestFolderForFile:(NSURL *)fileUrl {
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if(![fileUrl isFileURL]) return;
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NSURL *folderUrl = [fileUrl URLByDeletingLastPathComponent];
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@synchronized(self) {
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SandboxEntry *_entry = nil;
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for(SandboxEntry *entry in storage) {
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if(entry.path && entry.isFolder && [SandboxBroker isPath:folderUrl aSubdirectoryOf:[NSURL fileURLWithPath:entry.path]]) {
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_entry = entry;
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break;
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}
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}
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if(!_entry) {
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_entry = [self recursivePathTest:folderUrl];
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}
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if(!_entry) {
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dispatch_sync_reentrant(dispatch_get_main_queue(), ^{
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static BOOL warnedYet = NO;
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if(!warnedYet) {
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NSAlert *alert = [[NSAlert alloc] init];
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[alert setMessageText:NSLocalizedString(@"GrantPathTitle", @"Title of file dialog for granting folder access")];
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[alert setInformativeText:NSLocalizedString(@"GrantPathMessage", @"Message to new users regarding file permissions")];
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[alert addButtonWithTitle:NSLocalizedString(@"GrantPathOK", @"OK button text")];
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[alert addButtonWithTitle:NSLocalizedString(@"GrantPathStopWarning", @"Button to stop warnings for session")];
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if([alert runModal] == NSAlertSecondButtonReturn) {
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warnedYet = YES;
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}
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}
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NSOpenPanel *panel = [NSOpenPanel openPanel];
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[panel setAllowsMultipleSelection:NO];
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[panel setCanChooseDirectories:YES];
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[panel setCanChooseFiles:NO];
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[panel setFloatingPanel:YES];
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[panel setDirectoryURL:folderUrl];
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[panel setTitle:NSLocalizedString(@"GrantPathTitle", @"Title of file dialog for granting folder access")];
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NSInteger result = [panel runModal];
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if(result == NSModalResponseOK) {
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NSURL *folderUrl = [panel URL];
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NSError *err = nil;
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NSData *bookmark = [folderUrl bookmarkDataWithOptions:NSURLBookmarkCreationWithSecurityScope includingResourceValuesForKeys:nil relativeToURL:nil error:&err];
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if(!bookmark && err) {
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ALog(@"Failed to add bookmark for URL: %@, with error: %@", folderUrl, [err localizedDescription]);
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return;
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}
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NSLock *lock = [SandboxBroker sharedPersistentContainerLock];
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NSPersistentContainer *pc = [SandboxBroker sharedPersistentContainer];
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[lock lock];
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SandboxToken *token = [NSEntityDescription insertNewObjectForEntityForName:@"SandboxToken" inManagedObjectContext:pc.viewContext];
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[lock unlock];
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if(token) {
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token.path = [folderUrl path];
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token.bookmark = bookmark;
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[SandboxBroker cleanupFolderAccess];
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}
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}
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});
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}
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}
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}
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+ (void)cleanupFolderAccess {
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NSLock *lock = [SandboxBroker sharedPersistentContainerLock];
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NSPersistentContainer *pc = [SandboxBroker sharedPersistentContainer];
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NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"path.length" ascending:YES];
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NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"SandboxToken"];
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request.sortDescriptors = @[sortDescriptor];
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NSError *error = nil;
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[lock lock];
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NSArray *results = [pc.viewContext executeFetchRequest:request error:&error];
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[lock unlock];
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BOOL isUpdated = NO;
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if(results && [results count]) {
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NSMutableArray *resultsCopy = [results mutableCopy];
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for(NSUInteger i = 0; i < [resultsCopy count] - 1; ++i) {
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SandboxToken *token = resultsCopy[i];
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NSURL *url = [NSURL fileURLWithPath:token.path];
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for(NSUInteger j = i + 1; j < [resultsCopy count];) {
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SandboxToken *compareToken = resultsCopy[j];
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if([SandboxBroker isPath:[NSURL fileURLWithPath:compareToken.path] aSubdirectoryOf:url]) {
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[lock lock];
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[pc.viewContext deleteObject:compareToken];
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[lock unlock];
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isUpdated = YES;
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[resultsCopy removeObjectAtIndex:j];
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} else {
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++j;
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}
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}
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}
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}
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if(isUpdated) {
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NSError *error;
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[lock lock];
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[pc.viewContext save:&error];
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[lock unlock];
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if(error) {
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ALog(@"Error saving data: %@", [error localizedDescription]);
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}
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}
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}
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- (const void *)beginFolderAccess:(NSURL *)fileUrl {
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NSURL *folderUrl = [SandboxBroker urlWithoutFragment:fileUrl];
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if(![folderUrl isFileURL]) return NULL;
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SandboxEntry *_entry = nil;
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NSString *sandboxPath = [folderUrl path];
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@synchronized(self) {
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for(SandboxEntry *entry in storage) {
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if(entry.path) {
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if((entry.isFolder && [SandboxBroker isPath:folderUrl aSubdirectoryOf:[NSURL fileURLWithPath:entry.path]]) ||
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(!entry.isFolder && [entry.path isEqualToString:sandboxPath])) {
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entry.refCount += 1;
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_entry = entry;
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break;
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}
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}
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}
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if(!_entry) {
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_entry = [self recursivePathTest:folderUrl];
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}
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if(_entry) {
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[storage addObject:_entry];
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if(_entry.secureUrl) {
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[_entry.secureUrl startAccessingSecurityScopedResource];
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}
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return CFBridgingRetain(_entry);
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} else {
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return NULL;
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}
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}
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}
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- (void)endFolderAccess:(const void *)handle {
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if(!handle) return;
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SandboxEntry *entry = CFBridgingRelease(handle);
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if(!entry) return;
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@synchronized(self) {
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if(entry.refCount > 1) {
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entry.refCount -= 1;
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return;
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} else {
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if(entry.secureUrl) {
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[entry.secureUrl stopAccessingSecurityScopedResource];
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entry.secureUrl = nil;
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}
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entry.refCount = 0;
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[storage removeObject:entry];
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}
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}
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}
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- (BOOL)areAllPathsSafe:(NSArray *)urls {
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for(NSURL *url in urls) {
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if(![url isFileURL]) continue;
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if(![self recursivePathTest:url]) {
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return NO;
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}
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}
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return YES;
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}
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@end
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