H5P Iframe Embedder URL with space results in 404

Hello,

I have detected a problem with H5P Iframe Embedder working on Moodle. If I set a URL to a PDF that has a space in the filename and I store it in a moodle folder, H5P gives an error and does not show the content, resulting in 404 Not Found.

Steps to replicate it:

• Create a test course on demo.moodle.net (Moodle 4.0.4)
• In the course, create a folder resource and upload a pdf named "test file.pdf" (blank space important).
• Get the URL to the PDF by accessing the  folder resource and right clicking on the file / copy link.
• Example link: https://sandbox.moodledemo.net/pluginfile.php/63/mod_folder/content/0/test%20flle.pdf?forcedownload=1 (note the space coded as %20).
• In the test course, create an H5P activity of type Iframe Embedder, set a title and in src indicate the URL: https://sandbox.moodledemo.net/pluginfile.php/63/mod_folder/content/0/test%20flle.pdf?forcedownload=1
• Save and access the activity.
• A 404 error will be displayed in DevTools (chrome. Firefox also fails).

In DevTools, if you analyze the URL that is being used to embed, you can find that it is encoding the %20 part of the URL as %2520. I think it encodes the original % itself as %25, resulting in %2520 and this is finally not recognized correctly and 404 is returned.

Actually, I detected the problem using the Interactive Book activity and in this one using Iframe Embedder, but in the end the problem seems to be in the latter.

This happens in Moodle 3.9.15, 3.11.8 and also in 4.0.4.

Greetings and thanks