typefind/xdgmime: Validate mimetypes to be valid GstStructure names before using them

On macOS, for example, "text/*" can be returned as mimetype for plaintext files but we don't allow '*' in structure names and this would cause critical warnings.

It's a valid mimetype but not a valid structure name.

Fixes gstreamer#616 (closed)

added 1.18 Needs backport labels

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Merge Request for backport into 1.18 branch: !877 (merged) (target milestone: 1.18.1)

mentioned in merge request !877 (merged)

assigned to @gstreamer-merge-bot

mentioned in commit slomo/gst-plugins-base@3036521f

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• 3036521f - typefind/xdgmime: Validate mimetypes to be valid GstStructure names before using them

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assigned to @slomo and unassigned @gstreamer-merge-bot

I couldn't merge this branch: CI failed!

assigned to @gstreamer-merge-bot and unassigned @slomo

merged

Do we have a good reson not to make it a valid structure name?

I don't know, it might break assumptions elsewhere because we considered it invalid since basically forever :)

I wonder in what case those assumptions were made :)

I don't know, you're free to investigate and also if that happens at all. It seems like an arbitrary limitation but who knows

mentioned in commit tpm/gst-plugins-base@c4835833

added Backported into 1.16 label and removed Needs backport label