148 lines
4.9 KiB
Elixir
148 lines
4.9 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.Metadata.Providers.OpenGraph do
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alias Pleroma.User
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alias Pleroma.Web.MediaProxy
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alias Pleroma.Web.Metadata
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alias Pleroma.Web.Metadata.Providers.Provider
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alias Pleroma.Web.Metadata.Utils
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@behaviour Provider
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@media_types ["image", "audio", "video"]
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@impl Provider
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def build_tags(%{
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object: object,
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url: url,
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user: user
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}) do
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attachments = build_attachments(object)
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scrubbed_content = Utils.scrub_html_and_truncate(object)
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[
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{:meta,
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[
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property: "og:title",
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content: Utils.user_name_string(user)
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], []},
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{:meta, [property: "og:url", content: url], []},
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{:meta,
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[
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property: "og:description",
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content: scrubbed_content
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], []},
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{:meta, [property: "og:type", content: "article"], []}
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] ++
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if attachments == [] or Metadata.activity_nsfw?(object) do
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[
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{:meta, [property: "og:image", content: MediaProxy.preview_url(User.avatar_url(user))],
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[]},
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{:meta, [property: "og:image:width", content: 150], []},
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{:meta, [property: "og:image:height", content: 150], []}
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]
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else
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attachments
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end
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end
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@impl Provider
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def build_tags(%{user: user}) do
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with truncated_bio = Utils.scrub_html_and_truncate(user.bio) do
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[
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{:meta,
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[
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property: "og:title",
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content: Utils.user_name_string(user)
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], []},
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{:meta, [property: "og:url", content: user.uri || user.ap_id], []},
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{:meta, [property: "og:description", content: truncated_bio], []},
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{:meta, [property: "og:type", content: "article"], []},
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{:meta, [property: "og:image", content: MediaProxy.preview_url(User.avatar_url(user))],
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[]},
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{:meta, [property: "og:image:width", content: 150], []},
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{:meta, [property: "og:image:height", content: 150], []}
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]
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end
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end
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defp build_attachments(%{data: %{"attachment" => attachments}}) do
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Enum.reduce(attachments, [], fn attachment, acc ->
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rendered_tags =
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Enum.reduce(attachment["url"], [], fn url, acc ->
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# TODO: Whatsapp only wants JPEG or PNGs. It seems that if we add a second og:image
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# object when a Video or GIF is attached it will display that in Whatsapp Rich Preview.
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case Utils.fetch_media_type(@media_types, url["mediaType"]) do
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"audio" ->
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[
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{:meta, [property: "og:audio", content: MediaProxy.url(url["href"])], []}
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| acc
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]
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# Not using preview_url for this. It saves bandwidth, but the image dimensions will
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# be wrong. We generate it on the fly and have no way to capture or analyze the
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# image to get the dimensions. This can be an issue for apps/FEs rendering images
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# in timelines too, but you can get clever with the aspect ratio metadata as a
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# workaround.
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"image" ->
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[
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{:meta, [property: "og:image", content: MediaProxy.url(url["href"])], []},
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{:meta, [property: "og:image:alt", content: attachment["name"]], []}
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| acc
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]
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|> maybe_add_dimensions(url)
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"video" ->
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[
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{:meta, [property: "og:video", content: MediaProxy.url(url["href"])], []}
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| acc
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]
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|> maybe_add_dimensions(url)
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|> maybe_add_video_thumbnail(url)
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_ ->
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acc
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end
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end)
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acc ++ rendered_tags
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end)
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end
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defp build_attachments(_), do: []
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# We can use url["mediaType"] to dynamically fill the metadata
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defp maybe_add_dimensions(metadata, url) do
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type = url["mediaType"] |> String.split("/") |> List.first()
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cond do
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!is_nil(url["height"]) && !is_nil(url["width"]) ->
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metadata ++
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[
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{:meta, [property: "og:#{type}:width", content: "#{url["width"]}"], []},
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{:meta, [property: "og:#{type}:height", content: "#{url["height"]}"], []}
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]
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true ->
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metadata
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end
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end
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# Media Preview Proxy makes thumbnails of videos without resizing, so we can trust the
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# width and height of the source video.
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defp maybe_add_video_thumbnail(metadata, url) do
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cond do
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Pleroma.Config.get([:media_preview_proxy, :enabled], false) ->
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metadata ++
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[
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{:meta, [property: "og:image:width", content: "#{url["width"]}"], []},
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{:meta, [property: "og:image:height", content: "#{url["height"]}"], []},
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{:meta, [property: "og:image", content: MediaProxy.preview_url(url["href"])], []}
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]
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true ->
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metadata
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end
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end
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end
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