+# 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.OpenGraph do
alias Pleroma.Web.Metadata.Providers.Provider
+ alias Pleroma.Web.Metadata
alias Pleroma.{HTML, Formatter, User}
alias Pleroma.Web.MediaProxy
@behaviour Provider
@impl Provider
- def build_tags(%{activity: activity, user: user}) do
- with truncated_content = scrub_html_and_truncate(activity.data["object"]["content"]) do
- [
- {:meta,
- [
- property: "og:title",
- content: user_name_string(user)
- ], []},
- {:meta, [property: "og:url", content: activity.data["id"]], []},
- {:meta, [property: "og:description", content: truncated_content], []},
- {:meta, [property: "og:image", content: user_avatar_url(user)], []},
- {:meta, [property: "og:image:width", content: 120], []},
- {:meta, [property: "og:image:height", content: 120], []},
- {:meta, [property: "twitter:card", content: "summary"], []}
- ]
- end
+ def build_tags(%{
+ object: object,
+ url: url,
+ user: user
+ }) do
+ attachments = build_attachments(object)
+ scrubbed_content = 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: "#{user_name_string(user)}" <> content
+ ], []},
+ {:meta, [property: "og:type", content: "website"], []}
+ ] ++
+ if attachments == [] or Metadata.activity_nsfw?(object) do
+ [
+ {:meta, [property: "og:image", content: 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
], []},
{:meta, [property: "og:url", content: User.profile_url(user)], []},
{:meta, [property: "og:description", content: truncated_bio], []},
- {:meta, [property: "og:image", content: user_avatar_url(user)], []},
- {:meta, [property: "og:image:width", content: 120], []},
- {:meta, [property: "og:image:height", content: 120], []},
- {:meta, [property: "twitter:card", content: "summary"], []}
+ {:meta, [property: "og:type", content: "website"], []},
+ {:meta, [property: "og:image", content: attachment_url(User.avatar_url(user))], []},
+ {:meta, [property: "og:image:width", content: 150], []},
+ {:meta, [property: "og:image:height", content: 150], []}
]
end
end
- defp scrub_html_and_truncate(content) do
+ defp build_attachments(%{data: %{"attachment" => attachments}}) do
+ Enum.reduce(attachments, [], fn attachment, acc ->
+ rendered_tags =
+ Enum.reduce(attachment["url"], [], fn url, acc ->
+ 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.
+ # 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 the Whatsapp Rich Preview.
+ case media_type do
+ "audio" ->
+ [
+ {:meta, [property: "og:" <> media_type, content: attachment_url(url["href"])], []}
+ | acc
+ ]
+
+ "image" ->
+ [
+ {:meta, [property: "og:" <> media_type, content: attachment_url(url["href"])],
+ []},
+ {:meta, [property: "og:image:width", content: 150], []},
+ {:meta, [property: "og:image:height", content: 150], []}
+ | acc
+ ]
+
+ "video" ->
+ [
+ {:meta, [property: "og:" <> media_type, content: attachment_url(url["href"])], []}
+ | acc
+ ]
+
+ _ ->
+ acc
+ end
+ end)
+
+ acc ++ rendered_tags
+ end)
+ end
+
+ defp scrub_html_and_truncate(%{data: %{"content" => content}} = object) do
+ content
+ # html content comes from DB already encoded, decode first and scrub after
+ |> HtmlEntities.decode()
+ |> String.replace(~r/<br\s?\/?>/, " ")
+ |> HTML.get_cached_stripped_html_for_object(object, __MODULE__)
+ |> Formatter.demojify()
+ |> Formatter.truncate()
+ end
+
+ defp scrub_html_and_truncate(content) when is_binary(content) do
content
# html content comes from DB already encoded, decode first and scrub after
|> HtmlEntities.decode()
|> String.replace(~r/<br\s?\/?>/, " ")
|> HTML.strip_tags()
+ |> Formatter.demojify()
|> Formatter.truncate()
end
- defp user_avatar_url(user) do
- User.avatar_url(user) |> MediaProxy.url()
+ defp attachment_url(url) do
+ MediaProxy.url(url)
end
defp user_name_string(user) do
- "#{user.name}" <>
+ "#{user.name} " <>
if user.local do
"(@#{user.nickname}@#{Pleroma.Web.Endpoint.host()})"
else
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