Problem/Motivation

"accepts" attribute allows us to specify file types that can be uploaded via element. This enables some extra client-side validation of uploads and improves UX. Attribute is supported in all major browsers except Safari and IE. Browsers that do not support it will simply allow uploads of all files, which will be handles server-side anyway.

Proposed resolution

Add "#allowed_file_types" option to file and managed_file FAPI elements that will accept allowed file extensions. This will be translated to list of allowed mime types in process callback.

Remaining tasks

Everything ;)

User interface changes

None.

API changes

None. Just adds new functionality.

Original report by @tsphethean

This was originally posted by tsphethean in #625958-106: Support Uploading Multiple Files for HTML5 Browsers via #multiple attribute.

Comments

Version: 8.0.x-dev » 8.1.x-dev

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mbaynton’s picture

Issue summary: View changes

http://caniuse.com/#feat=input-file-accept is worth a look. Most notable:

  1. In Android 5, it seems to use some heuristics to map the accepts information to the installed apps that have registered for selecting or generating files of those types. The apps are free to feed anything back into the form, however, so it isn't bulletproof.
    There's no support in iOS Safari (5% market share) and another percent or two from a smattering of other browsers
    → Do we want to also validate by JavaScript? #2235977: JS Client-side file validation is broken (because ajaxPageState is broken?)
  2. Allegedly, in Android 4.4, including this "Does not allow any files to be picked at all." I couldn't reproduce that on a Galaxy Note 4 in BrowserStack. Would be interesting to see what a Nexus 5 does...
  3. Having Drupal convert from extensions to mime types, as in the proposed solution, seems a little complicated but the right thing to do due to Safari and IE mobile's issues with the file extension format. However, I think this conversion should be done by the FileWidget and not by a FAPI element -- if you are passing values directly to a ManagedFile yourself, it is easy for you to just pass 'image/*' etc if that's what you mean, but would be hard to undo ManagedFile changing it around on you.

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AdamPS’s picture

FYI

  • Image Field already adds "accepts" attribute "image/*"
  • Convert from extensions to mime types is easy with \Drupal::service('file.mime_type.guesser.extension');

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