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Use of eval in development mode violates Content-Security-Policy #6611

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unindented opened this issue Mar 3, 2019 · 7 comments
Closed

Use of eval in development mode violates Content-Security-Policy #6611

unindented opened this issue Mar 3, 2019 · 7 comments

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@unindented
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unindented commented Mar 3, 2019 •
edited

Version

4.4.0-beta.7

Test Case

CodeSandbox doesn't support adding CSP, but it would look like this:

<html>
<head>
  <meta http-equiv="Content-Security-Policy" content="default-src 'none'; script-src 'self'; style-src 'self' 'unsafe-inline';" />
</head>
<body>
  <div id="root"></div>
  <script src="index.js"></script>
</body>
</html>

Steps to reproduce

Import react-router in some file, launch app in development mode.

Expected Behavior

Things loading fine with CSP enabled.

Actual Behavior

Browser blocks execution of react-router.js because it uses eval:

screen shot 2019-03-03 at 4 57 22 am

screen shot 2019-03-03 at 5 06 36 am

Is there a way of implementing your current logic without eval?
@unindented
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(This issue wasn't present in 4.4.0-beta.6 btw.)

@emmenko
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emmenko commented Mar 5, 2019 •
edited

Having the same issue, I was about to report it as well. It was introduced here

https://github.com/ReactTraining/react-router/blob/b2c6fa0725b7ff1ed762064d633b26b6293e0140/packages/react-router/modules/index.js#L1-L20

@mjackson what was the reason for using eval?

@emmenko emmenko mentioned this issue Mar 5, 2019
Closed
emmenko added a commit to commercetools/merchant-center-application-kit that referenced this issue Mar 5, 2019
@emmenko
fix: pin react-router to 4.4.0-beta.6
f80c51a 
Ref: remix-run/react-router#6611
@emmenko emmenko mentioned this issue Mar 5, 2019
Merged
emmenko added a commit to commercetools/merchant-center-application-kit that referenced this issue Mar 5, 2019
@emmenko
fix: pin react-router to 4.4.0-beta.6 (#425)
63a45db 
* fix: pin react-router to 4.4.0-beta.6

Ref: remix-run/react-router#6611

* test(app-shell): update snapshot
@mjackson
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mjackson commented Mar 9, 2019

Thanks for the report, @unindented. The purpose of using eval indirectly here is to get a reference to the global object. I'll try another method and cut a new beta release.

@mjackson
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mjackson commented Mar 9, 2019

BTW, does anyone know what CSP Codesandbox actually uses?

@emmenko
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emmenko commented Mar 9, 2019

Thanks for fixing that! 💯

One small thing to clarify: it’s not just about codesandbox in particular but any app that uses a CSP in development mode.

Anyway, thanks again for looking into that 🤗

@mjackson
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The fix for this was just released in 4.4.0-beta.8. Please give it a shot.

@emmenko You can still use CSP with eval, you just have to include 'unsafe-eval'

@unindented
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@mjackson verified on my app, this is working perfectly. Thank you!

@lock lock bot locked as resolved and limited conversation to collaborators May 15, 2019
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3 participants
@unindented @mjackson @emmenko