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Font face permissions #58957

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wants to merge 12 commits into from
Closed

Font face permissions #58957

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peterwilsoncc
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@peterwilsoncc peterwilsoncc commented Feb 13, 2024

What?

Modifies the font face permissions to ensure the file system is writable for the installation and deletion of fonts.

The font library's JavaScript is modified to use these permission to determine whether to allow:

  • installation of google fonts
  • upload of font files
  • deletion of fonts

See #55280

Why?

Currently the DISALLOW_FILE_MODS constant is not checked as part of the font faces API allowing users to upload fonts when the fonts should not be disabled.

As this constant is used to indicate an immutable file system, the constant needs to be considered to allow for a good user experience uploading fonts. See WordPress/wporg-main-2022#388, #55063

How?

  • Induces the meta capabilities: install_font_faces, delete_font_faces.
  • Checks [core data store].canUser( 'create', 'font-families' ); to determine if a user can upload, removes the UI if not
  • Checks [core data store].canUser( 'delete', 'font-families' ); to determine if a user can delete, removes the UI if not

Note

Please test running this branch on WordPress 6.4.

The file the changes have been made in are not loaded on the current version of WordPress trunk.

Testing Instructions

  1. Install a font either via file upload or Google Fonts.
  2. Add define( 'DISALLOW_FILE_MODS', true ); to your wp-config file.
  3. Open Site Editor ... Styles > Typography > Manage Fonts
  4. Ensure the upload and Install fonts tabs are not shown
  5. Click the font you installed earlier
  6. Check the box next to the font
  7. Ensure the delete button is not available
  8. Remove the constant added earlier
  9. Ensure it's possible to delete your font.

Testing Instructions for Keyboard

Screenshots or screencast

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This pull request has changed or added PHP files. Please confirm whether these changes need to be synced to WordPress Core, and therefore featured in the next release of WordPress.

If so, it is recommended to create a new Trac ticket and submit a pull request to the WordPress Core Github repository soon after this pull request is merged.

If you're unsure, you can always ask for help in the #core-editor channel in WordPress Slack.

Thank you! ❤️

View changed files
❔ lib/compat/wordpress-6.5/fonts/fonts.php

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github-actions bot commented Feb 13, 2024

Size Change: +110 B (0%)

Total Size: 1.7 MB

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Flaky tests detected in d1933ab.
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🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/7925920273
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@peterwilsoncc peterwilsoncc added the [Type] Bug An existing feature does not function as intended label Feb 14, 2024
@peterwilsoncc peterwilsoncc changed the title Try Font Face Permissions Font face permissions Feb 14, 2024
@peterwilsoncc peterwilsoncc marked this pull request as ready for review February 14, 2024 04:39
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@matiasbenedetto
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Hi @peterwilsoncc 👋 , thanks for working on this.

  1. Install a font either via file upload or Google Fonts.
  2. Add define( 'DISALLOW_FILE_MODS', true ); to your wp-config file.
  3. Open Site Editor ... Styles > Typography > Manage Fonts
  4. Ensure the upload and Install fonts tabs are not shown
  5. Click the font you installed earlier
  6. Check the box next to the font
  7. Ensure the delete button is not available
  8. Remove the constant added earlier
  9. Ensure it's possible to delete your font.

I tested this PR following the instructions, and it works as described.

If understood correctly from your comment defining define( 'DISALLOW_FILE_MODS,' true ); disallow file writing on all the folders except the uploads ones. I have a question: What behavior would be expected if the user customized the fonts folder inside the uploads folder as this extender did? In theory, the user would allowed to write fonts because, using that config, they will be written inside the uploads folder, but, running this PR, the tabs with the UI to install the fonts are not available.

@swissspidy
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It doesn‘t matter where the fonts folder is located. The capability check prevents adding fonts if file mods are disallowed.

@creativecoder
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There's some nuance to how fonts work that seems important to consider here:

  • wp_font_face posts contain a url in the src property of the font face JSON that point to the font file
  • The referenced font file url can be local (font file is uploaded to the site) or remote (font is hosted on a CDN)

So I think that permission to create a wp_font_face post should stay separate from uploading a font file. If DISALLOW_FILE_MODS is true, I don't think that should prevent creating all font faces (which can reference a remotely hosted file), only the actual font file upload.

Perhaps we could hand this by

  • Not showing the font upload UI in the Font Library when DISALLOW_FILE_MODS is true
  • Making sure that the POST font-faces endpoint disallows font file uploads when DISALLOW_FILE_MODS is true

Additionally, there's a discussion in this issue about how to signal when to upload a font file to the site (the current behavior with the Google Fonts library) vs using the remotely hosted font file. I'll add a comment there, I think that DISALLOW_FILE_MODS needs to be considered.

@peterwilsoncc
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@creativecoder I'm going to have to thinkg about this, I only became aware of the permissions discussion a couple of days ago so still getting my head aound the workings of the controller.

/**
* Filters the user capabilities to grant the font family capabilities as necessary.
*
* Files must be modifiable to grant these capabilities and the user must als
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Suggested change
* Files must be modifiable to grant these capabilities and the user must als
* Files must be modifiable to grant these capabilities and the user must also

* have the `edit_theme_options` capability.
*
* These are created as faux primitive capabilities to allow for the use
* if the delete_post meta capability.
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Suggested change
* if the delete_post meta capability.
* of the delete_post meta capability.

@getdave
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getdave commented Feb 22, 2024

Thanks for all the work on this PR.

We will need to merge this PR prior to Beta 3 and I'm starting to become concerned that it's now getting very close.

I think we should add some tests, including some Playwright e2e tests to validate that the Upload/Delete options are / aren't available based on certain conditions.

@creativecoder @matiasbenedetto are you able to support with this?

For my part I'm going to manually test the PR and will be around to assist wherever I can.

@creativecoder
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@getdave I'm working on a new PR today, combining the approach here with #59104, based on @peterwilsoncc 's feedback.

Here's what I'm planning:

  • Add new meta cap for font upload, following the same pattern as language packs
  • Gating UI install/delete actions based on font family user capabilities

@peterwilsoncc
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Closing this in favour of #59294 which includes a combination of this PR and Grant's original PR.

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6 participants