Allow modules to add/modify allowed File extensions

[mjordan]

Currently, the list of extensions allowed for "File" Media are hard coded in islandora/modules/islandora_core_feature/config/install/field.field.media.file.field_media_file.yml. They are:

file_extensions: 'txt rtf doc docx ppt pptx xls xlsx pdf odf odg odp ods odt fodt fods fodp fodg key numbers pages tiff tif jp2'

Modules should be able to alter this list, to allow for uploading of files whose extensions are not present (or removing extensions from the list to disallow uploading of specific types).

[Natkeeran]

@mjordan
This list is configurable via http://localhost:8000/admin/structure/media/manage/file/fields/media.file.field_media_file.

[mjordan]

Super! Thanks!

[mjordan]

Reopening this since it probably should be added to https://github.com/Islandora-CLAW/CLAW/blob/master/docs/user-documentation/datastreams.md.

[mjordan]

I am also thinking that we should document for developers how to override this list either in configuration or in code. For example, if I add some functionality in a custom module that allows uploading of .xml files, I should not need to tell admins "Step 5: Visit admin/structure/media/manage/file/fields/media.file.field_media_file and add 'xml' to the list of allowed extensions."

[seth-shaw-unlv]

@mjordan You can modify it inside a module's hook_install. I can provide an example later. @ajstanley beat me to it.

[Natkeeran]

For those who want to not to do any configuration outside of ansible, one approach might be to update the field.field.media.file.field_media_file.yml, then put into a post install task.

[ajstanley]

I stick this in hook_install
// Add myext extension if it doesn't already exist;
$field = FieldConfig::load("media.file.field_media_file");
$fieldSettings = $field->getSettings();
$extensions = $fieldSettings['file_extensions'];
if (!strpos($extensions, 'myext')) {
$fieldSettings['file_extensions'] .= ' myext';
$field->set('settings', $fieldSettings);
}