Re: Pasting images versus uploading

Ryan

Thank you for that research and advice. I need to follow through and absorb the implications. That means trying both and then deciding. 

I'll report in due course.

Thanks to all

Mike

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-------- Original message --------

From: Ryan Nowakowski <ryan@fattuba.com>

Date: 15/10/20 09:28 (GMT+10:00)

To: django-users@googlegroups.com

Subject: Re: Pasting images versus uploading

On Fri, Oct 09, 2020 at 06:22:10PM +1100, Mike Dewhirst wrote:
> On 9/10/2020 11:55 am, Ryan Nowakowski wrote:
> > Maybe you could swap out the default ImageField widget for
> > TinyMCE-lite HTMLField? Security-wise you probably want to sanitize
> > the input from HTMLField in Django to make sure only img tags are allowed.
>
> With the image pasted in, viewing the browser page source it is
> represented as just a string although it does contain ...
>
> ... src=&quot;data:image/png;base64,iVBOR ...
>
>
> Are you saying all I have to do is write a clean() method for the
> HTMLField to detect various image types?

In your Django form class I'd write a clean method specifically for that
field[1] that parses the html, perhaps using BeautifulSoup[2].  Then
search for any "img" tags.  For each img tag, parse the data URI[3] to
get the image data.

You still have the problem that the HTMLField is meant to be a
replacement for TextField so you'll need to figure out how to back that
with an ImageField instead.  Perhaps you should try to go one level
lower and use the TinyMCE form widget[4] instead of using the HTMLField?

[1] https://docs.djangoproject.com/en/3.1/ref/forms/validation/#cleaning-a-specific-field-attribute
[2] https://www.crummy.com/software/BeautifulSoup/bs4/doc/
[3] https://stackoverflow.com/a/33870677/226697
[4] http://romanvm.github.io/django-tinymce4-lite/usage.html#tinymce-widget-for-forms

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