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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Metadata.Providers.OpenGraph do
alias Pleroma.User
alias Pleroma.Web.Metadata
alias Pleroma.Web.Metadata.Providers.Provider
alias Pleroma.Web.Metadata.Utils
@behaviour Provider
@media_types ["image", "audio", "video"]
@impl Provider
def build_tags(%{
object: object,
url: url,
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
# Most previews only show og:title which is inconvenient. Instagram
# hacks this by putting the description in the title and making the
# description longer prefixed by how many likes and shares the post
# has. Here we use the descriptive nickname in the title, and expand
# the full account & nickname in the description. We also use the cute^Wevil
# smart quotes around the status text like Instagram, too.
[
{:meta,
[
property: "og:title",
content: "#{user.name}" <> content
], []},
{:meta, [property: "og:url", content: url], []},
{:meta,
[
property: "og:description",
content: "#{Utils.user_name_string(user)}" <> content
], []},
{:meta, [property: "og:type", content: "website"], []}
] ++
if attachments == [] or Metadata.activity_nsfw?(object) do
[
{:meta, [property: "og:image", content: Utils.attachment_url(User.avatar_url(user))],
[]},
{:meta, [property: "og:image:width", content: 150], []},
{:meta, [property: "og:image:height", content: 150], []}
]
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: "og:title",
content: Utils.user_name_string(user)
], []},
{:meta, [property: "og:url", content: user.uri || user.ap_id], []},
{:meta, [property: "og:description", content: truncated_bio], []},
{:meta, [property: "og:type", content: "website"], []},
{:meta, [property: "og:image", content: Utils.attachment_url(User.avatar_url(user))], []},
{:meta, [property: "og:image:width", content: 150], []},
{:meta, [property: "og:image:height", content: 150], []}
]
end
end
defp build_attachments(%{data: %{"attachment" => attachments}}) do
Enum.reduce(attachments, [], fn attachment, acc ->
rendered_tags =
Enum.reduce(attachment["url"], [], fn url, acc ->
# TODO: Add additional properties to objects when we have the data available.
# Also, Whatsapp only wants JPEG or PNGs. It seems that if we add a second og:image
# object when a Video or GIF is attached it will display that in Whatsapp Rich Preview.
case Utils.fetch_media_type(@media_types, url["mediaType"]) do
"audio" ->
[
{:meta, [property: "og:audio", content: Utils.attachment_url(url["href"])], []}
| acc
]
"image" ->
[
{:meta, [property: "og:image", content: Utils.attachment_url(url["href"])], []},
{:meta, [property: "og:image:width", content: 150], []},
{:meta, [property: "og:image:height", content: 150], []}
| acc
]
"video" ->
[
{:meta, [property: "og:video", content: Utils.attachment_url(url["href"])], []}
| acc
]
_ ->
acc
end
end)
acc ++ rendered_tags
end)
end
defp build_attachments(_), do: []
end

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