1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Web.Metadata.Providers.OpenGraph do
6 alias Pleroma.Web.Metadata.Providers.Provider
7 alias Pleroma.Web.Metadata
8 alias Pleroma.{HTML, Formatter, User}
9 alias Pleroma.Web.MediaProxy
18 attachments = build_attachments(object)
19 scrubbed_content = scrub_html_and_truncate(object)
22 if scrubbed_content != "" and scrubbed_content != "\u200B" do
23 ": “" <> scrubbed_content <> "”"
28 # Most previews only show og:title which is inconvenient. Instagram
29 # hacks this by putting the description in the title and making the
30 # description longer prefixed by how many likes and shares the post
31 # has. Here we use the descriptive nickname in the title, and expand
32 # the full account & nickname in the description. We also use the cute^Wevil
33 # smart quotes around the status text like Instagram, too.
38 content: "#{user.name}" <> content
40 {:meta, [property: "og:url", content: object.data["id"]], []},
43 property: "og:description",
44 content: "#{user_name_string(user)}" <> content
46 {:meta, [property: "og:type", content: "website"], []}
48 if attachments == [] or Metadata.activity_nsfw?(object) do
50 {:meta, [property: "og:image", content: attachment_url(User.avatar_url(user))], []},
51 {:meta, [property: "og:image:width", content: 150], []},
52 {:meta, [property: "og:image:height", content: 150], []}
60 def build_tags(%{user: user}) do
61 with truncated_bio = scrub_html_and_truncate(user.bio || "") do
66 content: user_name_string(user)
68 {:meta, [property: "og:url", content: User.profile_url(user)], []},
69 {:meta, [property: "og:description", content: truncated_bio], []},
70 {:meta, [property: "og:type", content: "website"], []},
71 {:meta, [property: "og:image", content: attachment_url(User.avatar_url(user))], []},
72 {:meta, [property: "og:image:width", content: 150], []},
73 {:meta, [property: "og:image:height", content: 150], []}
78 defp build_attachments(%{data: %{"attachment" => attachments}}) do
79 Enum.reduce(attachments, [], fn attachment, acc ->
81 Enum.reduce(attachment["url"], [], fn url, acc ->
83 Enum.find(["image", "audio", "video"], fn media_type ->
84 String.starts_with?(url["mediaType"], media_type)
87 # TODO: Add additional properties to objects when we have the data available.
88 # Also, Whatsapp only wants JPEG or PNGs. It seems that if we add a second og:image
89 # object when a Video or GIF is attached it will display that in the Whatsapp Rich Preview.
93 {:meta, [property: "og:" <> media_type, content: attachment_url(url["href"])], []}
99 {:meta, [property: "og:" <> media_type, content: attachment_url(url["href"])],
101 {:meta, [property: "og:image:width", content: 150], []},
102 {:meta, [property: "og:image:height", content: 150], []}
108 {:meta, [property: "og:" <> media_type, content: attachment_url(url["href"])], []}
121 defp scrub_html_and_truncate(%{data: %{"content" => content}} = object) do
123 # html content comes from DB already encoded, decode first and scrub after
124 |> HtmlEntities.decode()
125 |> String.replace(~r/<br\s?\/?>/, " ")
126 |> HTML.get_cached_stripped_html_for_object(object, __MODULE__)
127 |> Formatter.demojify()
128 |> Formatter.truncate()
131 defp scrub_html_and_truncate(content) when is_binary(content) do
133 # html content comes from DB already encoded, decode first and scrub after
134 |> HtmlEntities.decode()
135 |> String.replace(~r/<br\s?\/?>/, " ")
137 |> Formatter.demojify()
138 |> Formatter.truncate()
141 defp attachment_url(url) do
145 defp user_name_string(user) do
148 "(@#{user.nickname}@#{Pleroma.Web.Endpoint.host()})"
150 "(@#{user.nickname})"