Provide thumbnail with RSS

[eskan]

Hi,
the RSS feed should provide a url for image or thumbnail.
regards,

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[dessalines]

I guess just the sites favicon? https://dev.lemmy.ml/static/assets/favicon.svg

Can RSS feeds have svg thumbnails? If not there's an apple-touch-icon one.

[Nutomic]

Pretty sure the issue is about including thumbnails for posts in the RSS feed. Apparently we forgot to add that in the initial implementation.

[dessalines]

The thumbnails (unless its an image post) aren't stored on the back-end yet. This will have to wait for #558 .

[Nutomic]

We could also just include the full-size images.

[dessalines]

The pictshare_urls are full size, but the back end currently doesn't store any images, only the url field.

[eskan]

the url field should be perfect, here a rss reference :
https://www.w3schools.com/xml/xml_rss.asp#rssref
is enclosure is the best way to reference an image ?
https://www.w3schools.com/xml/rss_tag_enclosure.asp

[dessalines]

@Nutomic There are now thumbnails in the post fetch, the thumbnail_url column.

[Nutomic]

I might be missing something here, but it looks like the rss crate does not support images for feed items, only for channels. Maybe there is a workaround with extensions or something, but I'm not sure.

https://rust-syndication.github.io/rss/rss/struct.Channel.html#method.image
https://rust-syndication.github.io/rss/rss/struct.Item.html

Edit: Forget that, we just need to put it in the html.

[dessalines]

Unfortunately stackoverflow is debating on it, but it looks like it needs to be an enclosure:

https://rust-syndication.github.io/rss/rss/struct.Enclosure.html

Basically if the pictshare_thumbnail column exists, we set an image enclosure for the item. @Nutomic u want this or should I do?

[Nutomic]

I dont really care, but anyway its really low priority.

[Nutomic]

This is easy enough to do with the following code, but enclosure requires length and mime fields. We could get the mime based on the thumbnail filename, but getting the size requires a network call to pict-rs, and thats just too slow.

    if let Some(thumbnail) = p.thumbnail_url {
      let mut enclosure = Enclosure::default();
      enclosure.set_url(thumbnail);
      i.enclosure(enclosure);
    }

[Elara6331]

I believe the enclosure tag is meant to be used for prefetching, and I don't think it gets shown as a thumbnail in most RSS feed readers. I tried it on a few and it didn't show up as a thumbnail.

What does seem to work in most readers is the <media:content /> tag from the Media extension, which isn't supported by the rss crate yet (rust-syndication/rss#29). Specifically, this tag seems to work everywhere I've tried:

<media:content url="https://lemmy.ml/pictrs/image/84ccd4ee-a278-4bf0-9d63-dad21add2e50.jpeg?thumbnail=256" medium="image"/>

Here's what this looks like in Fluent Reader: