Merge remote-tracking branch 'remotes/upstream/develop' into twitter_oauth
[akkoma] / lib / pleroma / web / metadata / opengraph.ex
1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
4
5 defmodule Pleroma.Web.Metadata.Providers.OpenGraph do
6 alias Pleroma.User
7 alias Pleroma.Web.Metadata
8 alias Pleroma.Web.Metadata.Providers.Provider
9 alias Pleroma.Web.Metadata.Utils
10
11 @behaviour Provider
12
13 @impl Provider
14 def build_tags(%{
15 object: object,
16 url: url,
17 user: user
18 }) do
19 attachments = build_attachments(object)
20 scrubbed_content = Utils.scrub_html_and_truncate(object)
21 # Zero width space
22 content =
23 if scrubbed_content != "" and scrubbed_content != "\u200B" do
24 ": “" <> scrubbed_content <> "”"
25 else
26 ""
27 end
28
29 # Most previews only show og:title which is inconvenient. Instagram
30 # hacks this by putting the description in the title and making the
31 # description longer prefixed by how many likes and shares the post
32 # has. Here we use the descriptive nickname in the title, and expand
33 # the full account & nickname in the description. We also use the cute^Wevil
34 # smart quotes around the status text like Instagram, too.
35 [
36 {:meta,
37 [
38 property: "og:title",
39 content: "#{user.name}" <> content
40 ], []},
41 {:meta, [property: "og:url", content: url], []},
42 {:meta,
43 [
44 property: "og:description",
45 content: "#{Utils.user_name_string(user)}" <> content
46 ], []},
47 {:meta, [property: "og:type", content: "website"], []}
48 ] ++
49 if attachments == [] or Metadata.activity_nsfw?(object) do
50 [
51 {:meta, [property: "og:image", content: Utils.attachment_url(User.avatar_url(user))],
52 []},
53 {:meta, [property: "og:image:width", content: 150], []},
54 {:meta, [property: "og:image:height", content: 150], []}
55 ]
56 else
57 attachments
58 end
59 end
60
61 @impl Provider
62 def build_tags(%{user: user}) do
63 with truncated_bio = Utils.scrub_html_and_truncate(user.bio || "") do
64 [
65 {:meta,
66 [
67 property: "og:title",
68 content: Utils.user_name_string(user)
69 ], []},
70 {:meta, [property: "og:url", content: User.profile_url(user)], []},
71 {:meta, [property: "og:description", content: truncated_bio], []},
72 {:meta, [property: "og:type", content: "website"], []},
73 {:meta, [property: "og:image", content: Utils.attachment_url(User.avatar_url(user))], []},
74 {:meta, [property: "og:image:width", content: 150], []},
75 {:meta, [property: "og:image:height", content: 150], []}
76 ]
77 end
78 end
79
80 defp build_attachments(%{data: %{"attachment" => attachments}}) do
81 Enum.reduce(attachments, [], fn attachment, acc ->
82 rendered_tags =
83 Enum.reduce(attachment["url"], [], fn url, acc ->
84 media_type =
85 Enum.find(["image", "audio", "video"], fn media_type ->
86 String.starts_with?(url["mediaType"], media_type)
87 end)
88
89 # TODO: Add additional properties to objects when we have the data available.
90 # Also, Whatsapp only wants JPEG or PNGs. It seems that if we add a second og:image
91 # object when a Video or GIF is attached it will display that in Whatsapp Rich Preview.
92 case media_type do
93 "audio" ->
94 [
95 {:meta,
96 [property: "og:" <> media_type, content: Utils.attachment_url(url["href"])], []}
97 | acc
98 ]
99
100 "image" ->
101 [
102 {:meta,
103 [property: "og:" <> media_type, content: Utils.attachment_url(url["href"])], []},
104 {:meta, [property: "og:image:width", content: 150], []},
105 {:meta, [property: "og:image:height", content: 150], []}
106 | acc
107 ]
108
109 "video" ->
110 [
111 {:meta,
112 [property: "og:" <> media_type, content: Utils.attachment_url(url["href"])], []}
113 | acc
114 ]
115
116 _ ->
117 acc
118 end
119 end)
120
121 acc ++ rendered_tags
122 end)
123 end
124 end