akkoma/lib/pleroma/web/metadata/twitter_card.ex
Mark Felder ac7ef0999d WIP: Fix Twitter Cards
Twitter cards were not passing any useful metadata. A few things were
being handled on Twitter's end by trying to match OpenGraph tags with
their own, but it wasn't working at all for media. This is an attempt to
fix that.

Common functions have been pulled out of opengraph and put into
utils. Twitter's functionality was entirely replaced with a direct copy
of Opengraph's and then modified as needed.

Profiles are now represented as Summary Cards

Posts with images are now represented as Summart with Large Image Cards

Posts with video and audio attachments are represented as Player Cards.

This now passes the Twitter Card Validator.

Validator and Docs are below

https://cards-dev.twitter.com/validator
https://developer.twitter.com/en/docs/tweets/optimize-with-cards/overview/abouts-cards
2019-02-11 23:59:04 +00:00

122 lines
3.7 KiB
Elixir

# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Metadata.Providers.TwitterCard do
alias Pleroma.User
alias Pleroma.Web.Metadata
alias Pleroma.Web.Metadata.Providers.Provider
alias Pleroma.Web.Metadata.Utils
@behaviour Provider
@impl Provider
def build_tags(%{
object: object,
user: user
}) do
attachments = build_attachments(object)
scrubbed_content = Utils.scrub_html_and_truncate(object)
# Zero width space
content =
if scrubbed_content != "" and scrubbed_content != "\u200B" do
"" <> scrubbed_content <> ""
else
""
end
[
{:meta,
[
property: "twitter:title",
content: Utils.user_name_string(user)
], []},
{:meta,
[
property: "twitter:description",
content: content
], []}
] ++
if attachments == [] or Metadata.activity_nsfw?(object) do
[
{:meta,
[property: "twitter:image", content: Utils.attachment_url(User.avatar_url(user))], []},
{:meta, [property: "twitter:card", content: "summary_large_image"], []}
]
else
attachments
end
end
@impl Provider
def build_tags(%{user: user}) do
with truncated_bio = Utils.scrub_html_and_truncate(user.bio || "") do
[
{:meta,
[
property: "twitter:title",
content: Utils.user_name_string(user)
], []},
{:meta, [property: "twitter:description", content: truncated_bio], []},
{:meta, [property: "twitter:image", content: Utils.attachment_url(User.avatar_url(user))],
[]},
{:meta, [property: "twitter:card", content: "summary"], []}
]
end
end
defp build_attachments(%{data: %{"attachment" => attachments}}) do
Enum.reduce(attachments, [], fn attachment, acc ->
rendered_tags =
Enum.reduce(attachment["url"], [], fn url, acc ->
content_type = url["mediaType"]
media_type =
Enum.find(["image", "audio", "video"], fn media_type ->
String.starts_with?(url["mediaType"], media_type)
end)
# TODO: Add additional properties to objects when we have the data available.
case media_type do
"audio" ->
[
{:meta, [property: "twitter:card", content: "player"], []},
{:meta, [property: "twitter:player", content: Utils.attachment_url(url["href"])],
[]}
| acc
]
"image" ->
[
{:meta, [property: "twitter:card", content: "summary_large_image"], []},
{:meta,
[
property: "twitter:player",
content:
Utils.attachment_url(
Pleroma.Uploaders.Uploader.preview_url(content_type, url["href"])
)
], []}
| acc
]
# TODO: Need the true width and height values here or Twitter renders an iFrame with a bad aspect ratio
"video" ->
[
{:meta, [property: "twitter:card", content: "player"], []},
{:meta, [property: "twitter:player", content: Utils.attachment_url(url["href"])],
[]},
{:meta, [property: "twitter:player:width", content: "1280"], []},
{:meta, [property: "twitter:player:height", content: "720"], []}
| acc
]
_ ->
acc
end
end)
acc ++ rendered_tags
end)
end
end