module Assembly

This is a manual override mapping of file extension to mimetype; if a file with the given extension is found, the mapped mimetype will be returned and no further methods will be used - this is used to force a specific mimetype to be returned for a given file extension regardless of what exif or the unix file system command returns the mapping format is “extension with period: returned mimetype”, e.g. for any .json file, you will always get ‘application/json`

The list of mimetypes that will be “trusted” by the unix file command; if a mimetype other than one of these is returned by the file command, then a check will be made to see if exif data exists… if so, the mimetype returned by the exif data will be used if no exif data exists, then the mimetype returned by the unix file command will be used

If input image is not one of these mime types, it will not be regarded as a valid image for the purpose of generating a JP2 derivative