+# 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.{HTML, Formatter, User}
- alias Pleroma.Web.MediaProxy
+ alias Pleroma.Web.Metadata.Utils
@behaviour Provider
+ @media_types ["image", "audio", "video"]
@impl Provider
- def build_tags(%{activity: activity, user: user}) do
- with truncated_content = scrub_html_and_truncate(activity) do
- attachments = build_attachments(activity)
+ 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
- [
- {:meta,
- [
- property: "og:title",
- content: user_name_string(user)
- ], []},
- {:meta, [property: "og:url", content: activity.data["id"]], []},
- {:meta, [property: "og:description", content: truncated_content], []}
- ] ++
- if attachments == [] or
- Enum.any?(activity.data["object"]["tag"], fn tag -> tag == "nsfw" end) do
- [
- {:meta, [property: "og:image", content: attachment_url(User.avatar_url(user))], []},
- {:meta, [property: "og:image:width", content: 120], []},
- {:meta, [property: "og:image:height", content: 120], []}
- ]
- else
- attachments
- end
- 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 = scrub_html_and_truncate(user.bio || "") do
+ with truncated_bio = Utils.scrub_html_and_truncate(user.bio || "") do
[
{:meta,
[
property: "og:title",
- content: user_name_string(user)
+ content: Utils.user_name_string(user)
], []},
- {:meta, [property: "og:url", content: User.profile_url(user)], []},
+ {:meta, [property: "og:url", content: user.uri || user.ap_id], []},
{:meta, [property: "og:description", content: truncated_bio], []},
- {:meta, [property: "og:image", content: attachment_url(User.avatar_url(user))], []},
- {:meta, [property: "og:image:width", content: 120], []},
- {:meta, [property: "og:image:height", content: 120], []}
+ {: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: %{"object" => %{"attachment" => attachments}}} = _activity) 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 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
+ ]
- if media_type do
- [
- {:meta, [property: "og:" <> media_type, content: attachment_url(url["href"])], []}
- | acc
- ]
- else
- 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)
end)
end
- defp scrub_html_and_truncate(%{data: %{"object" => %{"content" => content}}} = activity) 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(activity, __MODULE__)
- |> 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.truncate()
- end
-
- defp attachment_url(url) do
- MediaProxy.url(url)
- end
-
- defp user_name_string(user) do
- "#{user.name} " <>
- if user.local do
- "(@#{user.nickname}@#{Pleroma.Web.Endpoint.host()})"
- else
- "(@#{user.nickname})"
- end
- end
+ defp build_attachments(_), do: []
end
projects / akkoma / blobdiff