[Bug]: Cannot embed PDF in iframe when accessing local files via protocol.registerFileProtocol().

[george-thomas-hill]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Electron Version

17.1.0

What operating system are you using?

Other Linux

Operating System Version

Kubuntu 21.04

What arch are you using?

x64

Last Known Working Electron version

n/a

Expected Behavior

I expect to be able to display a PDF (or any other arbitrary local file) by embedding it in an iframe inside a BrowserWindow instance.

I expect to be able to access the local file by using protocol.registerFileProtocol() as described here: #23393

Actual Behavior

When I use the minimal test case available here . . .

https://github.com/george-thomas-hill/demo-electron-problem-embeding-pdf

. . . the PDF does not display.

My renderer process displays an empty iframe.

In my console, I get the message:

(node:2797438) electron: Failed to load URL: protocol://secretString/707861804 with error: ERR_BLOCKED_BY_CLIENT

Testcase Gist URL

No response

Additional Information

This might be related to the following issue: #28407

However, that issue's given workaround isn't available to me, because I'm using electron-forge and webpack, so my main process needs to have mainWindow.loadURL(MAIN_WINDOW_WEBPACK_ENTRY); I don't see a way to use loadURL('app://./index.html');.

I am able to display arbitrary files by using the following in app.jsx:

                <webview
                    src={useSrc}
                >
                </webview>

However, the Electron documentation advises against using <webview> elements, i.e. here: https://www.electronjs.org/docs/latest/api/webview-tag

I have also tried using the following in app.jsx:

                <embed
                    type="application/pdf"
                    src={useSrc}
                >
                </embed>

However, that crashes my app.

I believe that this constitutes a bug, and I hope it can be fixed.

Alternatively, I would be grateful for any advice regarding how to securely use <webview> tags (or some other work-around).

Thank you.

[github-actions]

This issue has been automatically marked as stale. If this issue is still affecting you, please leave any comment (for example, "bump"), and we'll keep it open. If you have any new additional information—in particular, if this is still reproducible in the latest version of Electron or in the beta—please include it with your comment!

[george-thomas-hill]

bump

[george-thomas-hill]

Update:

I'm still finding (in Electron 21.2.0) that loading a PDF in an iFrame fails to display the PDF, and loading a PDF in a webview crashes Electron.

Here's an Electron Fiddle gist that demonstrates this:

https://gist.github.com/george-thomas-hill/c3179e6eddeb1a2715201a20dbf95015

[shotor]

I'm seeing the same issues with no workaround. Using Electron 21.3.0

iframe, embed, object => grey box - network tab shows file was requested correctly
webview => 0x0 element in dom - no crash

I get this error in the console:

[70442:1118/152356.989338:ERROR:bad_message.cc(29)] Terminating renderer for bad IPC message, reason 1

[github-actions]

This issue has been automatically marked as stale. If this issue is still affecting you, please leave any comment (for example, "bump"), and we'll keep it open. If you have any new additional information—in particular, if this is still reproducible in the latest version of Electron or in the beta—please include it with your comment!

[github-actions]

This issue has been closed due to inactivity, and will not be monitored. If this is a bug and you can reproduce this issue on a supported version of Electron please open a new issue and include instructions for reproducing the issue.

[0kuang]

I'm seeing the same issues with no workaround. Using Electron 21.3.0

iframe, embed, object => grey box - network tab shows file was requested correctly webview => 0x0 element in dom - no crash

I get this error in the console:

[70442:1118/152356.989338:ERROR:bad_message.cc(29)] Terminating renderer for bad IPC message, reason 1

+1; I have the same problem in 24.1.3

[Skywalker13]

Same problem with electron 26...