how do I access host filesystem within devtool?

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Shi Yan

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Aug 11, 2020, 11:35:11 AM8/11/20
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I want to build an IDE to facilitate scraper development. 

The IDE will be a devTool. But I need to be able to open files/folders and write to them. The "Sources" tab in devtool can do that. How do I do the same in my devtool extension?


guest271314

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Aug 12, 2020, 10:37:04 AM8/12/20
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You can utilize Native File System to open files and folders and read or write the contents.

bill...@gmail.com

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Aug 13, 2020, 12:46:29 PM8/13/20
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I tried this https://developer.chrome.com/apps/fileSystem, totally not working.
await window.chooseFileSystemEntries(options) doesn't work either

bill...@gmail.com

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Aug 13, 2020, 1:05:25 PM8/13/20
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Uncaught (in promise) DOMException: Failed to execute 'chooseFileSystemEntries' on 'Window': Cross origin sub frames aren't allowed to show a file picker.
    at HTMLButtonElement.open (chrome-extension://nadpfibhpdomkeafkmcoapimjohefkob/script.js:55:17)

guest271314

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Aug 13, 2020, 9:35:32 PM8/13/20
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User action is required, which can be achieved using click or other mouse event, then, in main window

    const dir = await showDirectoryPicker();
    // set mode to readwrite for app/data directory
    const status = await dir.requestPermission({ mode: 'readwrite' });
    let fileHandle = await dir.getFileHandle('file', {
                                  create: true
                               });

To communicate with Chromium extension or Chromium app you can use messaging. This code https://github.com/guest271314/captureSystemAudio/tree/master/native_messaging/file_stream uses Native Messaging and Native File System, messages are sent to and from main window to Chromium app, after setting permissions for location.origin by reading and re-writing manifest.json https://github.com/guest271314/captureSystemAudio/blob/master/native_messaging/file_stream/app/set_externally_connectable.js to dynamically set externally_connectable permissions for the site.

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