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Contributed by
Kévin Dunglas
in #47710.
The File constraint from the Validator element checks {that a} given worth
is a legitimate file. Considered one of its choices is known as mimeTypes and it verifies that
the media kind (previously generally known as MIME kind) of the file is among the given values:
The values handed to mimeTypes should be any of the official checklist of legitimate media varieties.
A few of these values are complicated and cumbersome even for widespread file varieties
(e.g. Microsoft Excel have a number of media varieties related to it, reminiscent of
software/vnd.ms-excel, software/vnd.ms-excel.sheet.macroEnabled.12, and so on.)
In Symfony 6.2 we’re bettering the File constraint with a brand new possibility known as
extensions. This selection checks each the file extension and its media kind.
Utilizing this selection, the above instance seems as follows:
The extensions possibility checks each that the file has precisely the .pdf
extension and that its media kind is any of the kinds related to that extension
within the official checklist (software/pdf, software/x-pdf, and so on.)
Within the following instance, we enable importing any file related to JPEG media
varieties, however require that the extension is .jpg (so, .jpeg recordsdata will not be
allowed):
The extensions possibility additionally permits to cross a listing of media varieties to just accept
for the extension. Furthermore, you possibly can cross an array to just accept a number of extensions,
every of them optionally defining which media varieties to just accept:
