Show proper metadata for when you post the link in social networks or chats

[jancborchardt]

Currently you see stuff like this:

»This app requires Javascript…« instead of displaying the correct Calendar metadata, like the name and the person it was shared by, which should be in the website metadata (ogp or so).

cc @nextcloud/calendar

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[tcitworld]

It's strange that Discourse (?) doesn't uses the OGP tags we have. It works just fine in Facebook at least.
Maybe we could add Twitter tags too.

[jancborchardt]

@tcitworld that’s actually Riot: https://riot.im – maybe sign up there and test it, could be related to issues with others? Maybe Discourse actually has similar problems. Cause for other sites it works without issue.

[tcitworld]

It seems Matrix (which Riot is based upon) tries to get some kind of description since we don't provide one through the OCP tags : https://github.com/matrix-org/synapse/blob/master/synapse/rest/media/v1/preview_url_resource.py#L408
Maybe we could have a default one ? The files_sharing app uses %filename% is publicly shared, I guess we could add the same.

[georgehrke]

@tcitworld Would you like to look into this issue? :)

[georgehrke]

Requires nextcloud/server#17129