通过沙箱中的拖放验证 URL答案

【问题标题】：Validating URL from drag and drop in a sandbox通过沙箱中的拖放验证 URL
【发布时间】：2017-10-25 12:14:24
【问题描述】：

考虑到file access in a sandboxed osx app with swift，它是否与通过 Finder 或其他应用程序提供的 URL 一样工作？

由于没有 NSOpenPanel 调用来提供本示例中的文件夹访问权限，只有 url - 我认为文件夹访问是隐式的，因为用户从源/桌面“文件夹”拖动文件与通过打开的隐式选择大致相同对话框。

我尚未开始沙盒迁移，但想验证我的想法是否准确，但这里有一个候选例程不在沙盒模式下工作：

func performDragOperation(_ sender: NSDraggingInfo!) -> Bool {
    let pboard = sender.draggingPasteboard()
    let items = pboard.pasteboardItems

    if (pboard.types?.contains(NSURLPboardType))! {
        for item in items! {
            if let urlString = item.string(forType: kUTTypeURL as String) {
                self.webViewController.loadURL(text: urlString)
            }
            else
            if let urlString = item.string(forType: kUTTypeFileURL as String/*"public.file-url"*/) {
                let fileURL = NSURL.init(string: urlString)?.filePathURL
                self.webViewController.loadURL(url: fileURL!)
            }
            else
            {
                Swift.print("items has \(item.types)")
            }
        }
    }
    else
    if (pboard.types?.contains(NSPasteboardURLReadingFileURLsOnlyKey))! {
        Swift.print("we have NSPasteboardURLReadingFileURLsOnlyKey")
    }
    return true
}

因为没有 URL 被执行或抛出错误。

【问题讨论】：

标签： macos swift3 drag-and-drop appstore-sandbox nspasteboard

【解决方案1】：

是的，文件访问是隐式的。由于沙盒实现的文档记录很差并且有/有很多错误，因此您需要解决 URL 和文件名。视图应该在初始化时为这两种类型注册自己。代码在 Objective-C 中，但 API 应该相同。

    [self registerForDraggedTypes:[NSArray arrayWithObjects:NSFilenamesPboardType, NSURLPboardType, nil]];

然后在 performDragOperation 上：

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{
    BOOL dragPerformed = NO;
    NSPasteboard *paste = [sender draggingPasteboard];
    NSArray *typesWeRead = [NSArray arrayWithObjects:NSFilenamesPboardType, NSURLPboardType, nil];
    //a list of types that we can accept
    NSString *typeInPasteboard = [paste availableTypeFromArray:typesWeRead];

    if ([typeInPasteboard isEqualToString:NSFilenamesPboardType]) {
        NSArray *fileArray = [paste propertyListForType:@"NSFilenamesPboardType"];
        //be careful since this method returns id.  
        //We just happen to know that it will be an array. and it contains strings.
        NSMutableArray *urlArray = [NSMutableArray arrayWithCapacity:[fileArray count]];
        for (NSString *path in fileArray) {
            [urlArray addObject:[NSURL fileURLWithPath:path]];
        }
        dragPerformed = //.... do your stuff with the files;
    } else if ([typeInPasteboard isEqualToString:NSURLPboardType]) {
        NSURL *droppedURL = [NSURL URLFromPasteboard:paste];
        if ([droppedURL isFileURL]) {
            dragPerformed = //.... do your stuff with the files;
        }
    }
    return dragPerformed;
}

【讨论】：