[Webkit-unassigned] [Bug 234249] New: Downloading DMG using WKDownload errors with "You do not have permission"

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=234249

            Bug ID: 234249
           Summary: Downloading DMG using WKDownload errors with "You do
                    not have permission"
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Mac (Apple Silicon)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mitrasaurav97 at gmail.com

Created attachment 447017

  --> https://bugs.webkit.org/attachment.cgi?id=447017&action=review

Xcode project that replicates bug

Overview: If you download a DMG using WKNavigationResponsePolicy.download and WKDownload and try to open the app inside, you get either the error "You do not have permission to open the application" (macOS 11) or "This application can't be opened" (macOS 12)

Steps to Reproduce: I've included an Xcode project that will automatically open a page that downloads the DMG for Slack.
1. Run the project
2. Wait for the file to complete downloading (It will print "DOWNLOAD COMPLETE")
3. Open the dmg and try to open the Slack app.

Actual Results: An error prompt appears, not allowing the user to open the app at all.

Expected Results: The Slack app will open (with a quarantine dialog first to confirm opening the app)

Build & Hardware: Build 16611.2.7.1.4 on macOS 11.4

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