Provide a Context condition that detects a file's mimetype

[mjordan]

A Context condition that detects a file's Mime type would be useful, for example, to create a Context that displayed a file of a specific Mime type using a specific view mode.

[mjordan]

As discussed at the June 5 Tech call, I will create this condition and open a PR.

[kayakr]

@mjordan You may be across this already by the code in https://www.drupal.org/node/3055302 #4 could be relevant to you.

[mjordan]

@kayakr thanks for the pointer. Turns out I don't need to detect the MimeType, I can get it using the $file->getMimeType() method from Drupal\islandora\MediaSource\MediaSourceService. I'll be issuing a PR as soon as I can get past #1179 so feel free to comment on my implementation there if you want.

[mjordan]

Closing since #145 has been merged.