Conversations: Consider supporting oEmbed or other metadata tags for pasted URLs

[ivucica]

Sites such as YouTube contain metadata in various forms: oEmbed, OpenGraph, etc.

Consider supporting some of these metadata formats. It'd be great if a pasted YouTube link displayed the page title and thumbnail, similar to .jpg/.png links.

For privacy, this could be on a set of whitelisted domains -- because the only way to discover whether a link has oEmbed/OpenGraph requires fetching the link. This set of domains could be editable as an expert option.

[MontyJam]

I would not like this

[jkufner]

Rather than white list I would prefer "Show preview" button, which would load the referenced page and interpret metadata.

I'm not sure whether Conversations shows thumbnail of linked pictures. I would consider it the same feature. Privacy concerns are a big issue here, as well as security.

[horazont]

Automatic fetching and preview generation could be enabled only for contacts just like it is only enabled for contacts for image uploads. And for non-contacts, a preview button could be shown.

[iNPUTmice]

duplicate of #1778