Drupal core comes with input filter filter_html_image_secure, with the description "Restrict images to this site". It does what it says on the tin; restrict the use of img tags in HTML input to local images. Part of its check is to actually open the image file and determine its size (presumably just to see if it is an image). Of course, you will see the problem; as SFP relies on images being requested and downloading them on demand, the file will not be there yet on an environment running with SFP, the test will fail and the filter will conclude the file is not local. It substitutes a red cross icon.
* Set up an input format with the "Restrict images to this site" filter.
* Create some content with an inline, local image on the origin site. Make sure this is a new image that will not be available on the development site.
* Transfer the database to the development site
* Clear caches on the development site
* Open the content on the development site. Notice how the image is replaced with a red error icon.
Not sure. I suppose the least we should do is document this behaviour somewhere, but preferably, we'd have a workaround. The secure image filter has an alter hook, that the filter module itself uses to put in the actual placeholder image. Maybe we can disable filter module's implementation and substitute our own that can take into account whether the image *is* local to the origin site. If we do so, I think it would be a good idea to add an option to allow this to be disabled, since it does seem fairly intrusive and may not be appropriate for all sites.
An option to handle the secure image filter is added to the configuration screen.
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Closed: outdated
2.1
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Just curious could you try 2.1.x branch please.
Just following up if you tried on the 2.1.x branch?
If still a valid feature request please reopen.