git.squeep.com Git - akkoma/blob - lib/pleroma/formatter.ex

   1 defmodule Pleroma.Formatter do
   2   alias Pleroma.User
   3   alias Pleroma.Web.MediaProxy
   4   alias Pleroma.HTML
   5   alias Pleroma.Emoji
   6
   7   @tag_regex ~r/((?<=[^&])|\A)(\#)(\w+)/u
   8   @markdown_characters_regex ~r/(`|\*|_|{|}|[|]|\(|\)|#|\+|-|\.|!)/
   9
  10   # Modified from https://www.w3.org/TR/html5/forms.html#valid-e-mail-address
  11   @mentions_regex ~r/@[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]*@?[a-zA-Z0-9_-](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*/u
  12
  13   def parse_tags(text, data \\ %{}) do
  14     Regex.scan(@tag_regex, text)
  15     |> Enum.map(fn ["#" <> tag = full_tag | _] -> {full_tag, String.downcase(tag)} end)
  16     |> (fn map ->
  17           if data["sensitive"] in [true, "True", "true", "1"],
  18             do: [{"#nsfw", "nsfw"}] ++ map,
  19             else: map
  20         end).()
  21   end
  22
  23   @doc "Parses mentions text and returns list {nickname, user}."
  24   @spec parse_mentions(binary()) :: list({binary(), User.t()})
  25   def parse_mentions(text) do
  26     Regex.scan(@mentions_regex, text)
  27     |> List.flatten()
  28     |> Enum.uniq()
  29     |> Enum.map(fn nickname ->
  30       with nickname <- String.trim_leading(nickname, "@"),
  31            do: {"@" <> nickname, User.get_cached_by_nickname(nickname)}
  32     end)
  33     |> Enum.filter(fn {_match, user} -> user end)
  34   end
  35
  36   def emojify(text) do
  37     emojify(text, Emoji.get_all())
  38   end
  39
  40   def emojify(text, nil), do: text
  41
  42   def emojify(text, emoji) do
  43     Enum.reduce(emoji, text, fn {emoji, file}, text ->
  44       emoji = HTML.strip_tags(emoji)
  45       file = HTML.strip_tags(file)
  46
  47       String.replace(
  48         text,
  49         ":#{emoji}:",
  50         "<img height='32px' width='32px' alt='#{emoji}' title='#{emoji}' src='#{
  51           MediaProxy.url(file)
  52         }' />"
  53       )
  54       |> HTML.filter_tags()
  55     end)
  56   end
  57
  58   def get_emoji(text) when is_binary(text) do
  59     Enum.filter(Emoji.get_all(), fn {emoji, _} -> String.contains?(text, ":#{emoji}:") end)
  60   end
  61
  62   def get_emoji(_), do: []
  63
  64   @link_regex ~r/[0-9a-z+\-\.]+:[0-9a-z$-_.+!*'(),]+/ui
  65
  66   @uri_schemes Application.get_env(:pleroma, :uri_schemes, [])
  67   @valid_schemes Keyword.get(@uri_schemes, :valid_schemes, [])
  68
  69   # TODO: make it use something other than @link_regex
  70   def html_escape(text, "text/html") do
  71     HTML.filter_tags(text)
  72   end
  73
  74   def html_escape(text, "text/plain") do
  75     Regex.split(@link_regex, text, include_captures: true)
  76     |> Enum.map_every(2, fn chunk ->
  77       {:safe, part} = Phoenix.HTML.html_escape(chunk)
  78       part
  79     end)
  80     |> Enum.join("")
  81   end
  82
  83   @doc """
  84   Escapes a special characters in mention names.
  85   """
  86   @spec mentions_escape(String.t(), list({String.t(), any()})) :: String.t()
  87   def mentions_escape(text, mentions) do
  88     mentions
  89     |> Enum.reduce(text, fn {name, _}, acc ->
  90       escape_name = String.replace(name, @markdown_characters_regex, "\\\\\\1")
  91       String.replace(acc, name, escape_name)
  92     end)
  93   end
  94
  95   @doc "changes scheme:... urls to html links"
  96   def add_links({subs, text}) do
  97     links =
  98       text
  99       |> String.split([" ", "\t", "<br>"])
 100       |> Enum.filter(fn word -> String.starts_with?(word, @valid_schemes) end)
 101       |> Enum.filter(fn word -> Regex.match?(@link_regex, word) end)
 102       |> Enum.map(fn url -> {Ecto.UUID.generate(), url} end)
 103       |> Enum.sort_by(fn {_, url} -> -String.length(url) end)
 104
 105     uuid_text =
 106       links
 107       |> Enum.reduce(text, fn {uuid, url}, acc -> String.replace(acc, url, uuid) end)
 108
 109     subs =
 110       subs ++
 111         Enum.map(links, fn {uuid, url} ->
 112           {uuid, "<a href=\"#{url}\">#{url}</a>"}
 113         end)
 114
 115     {subs, uuid_text}
 116   end
 117
 118   @doc "Adds the links to mentioned users"
 119   def add_user_links({subs, text}, mentions) do
 120     mentions =
 121       mentions
 122       |> Enum.sort_by(fn {name, _} -> -String.length(name) end)
 123       |> Enum.map(fn {name, user} -> {name, user, Ecto.UUID.generate()} end)
 124
 125     uuid_text =
 126       mentions
 127       |> Enum.reduce(text, fn {match, _user, uuid}, text ->
 128         String.replace(text, match, uuid)
 129       end)
 130
 131     subs =
 132       subs ++
 133         Enum.map(mentions, fn {match, %User{id: id, ap_id: ap_id, info: info}, uuid} ->
 134           ap_id =
 135             if is_binary(info.source_data["url"]) do
 136               info.source_data["url"]
 137             else
 138               ap_id
 139             end
 140
 141           short_match = String.split(match, "@") |> tl() |> hd()
 142
 143           {uuid,
 144            "<span><a data-user='#{id}' class='mention' href='#{ap_id}'>@<span>#{short_match}</span></a></span>"}
 145         end)
 146
 147     {subs, uuid_text}
 148   end
 149
 150   @doc "Adds the hashtag links"
 151   def add_hashtag_links({subs, text}, tags) do
 152     tags =
 153       tags
 154       |> Enum.sort_by(fn {name, _} -> -String.length(name) end)
 155       |> Enum.map(fn {name, short} -> {name, short, Ecto.UUID.generate()} end)
 156
 157     uuid_text =
 158       tags
 159       |> Enum.reduce(text, fn {match, _short, uuid}, text ->
 160         String.replace(text, ~r/((?<=[^&])|(\A))#{match}/, uuid)
 161       end)
 162
 163     subs =
 164       subs ++
 165         Enum.map(tags, fn {tag_text, tag, uuid} ->
 166           url =
 167             "<a data-tag='#{tag}' href='#{Pleroma.Web.base_url()}/tag/#{tag}' rel='tag'>#{
 168               tag_text
 169             }</a>"
 170
 171           {uuid, url}
 172         end)
 173
 174     {subs, uuid_text}
 175   end
 176
 177   def finalize({subs, text}) do
 178     Enum.reduce(subs, text, fn {uuid, replacement}, result_text ->
 179       String.replace(result_text, uuid, replacement)
 180     end)
 181   end
 182 end