# Pleroma: A lightweight social networking server # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Formatter do alias Pleroma.User alias Pleroma.Web.MediaProxy alias Pleroma.HTML alias Pleroma.Emoji @tag_regex ~r/((?<=[^&])|\A)(\#)(\w+)/u @markdown_characters_regex ~r/(`|\*|_|{|}|[|]|\(|\)|#|\+|-|\.|!)/ # Modified from https://www.w3.org/TR/html5/forms.html#valid-e-mail-address @mentions_regex ~r/@[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]*@?[a-zA-Z0-9_-](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*/u def parse_tags(text, data \\ %{}) do Regex.scan(@tag_regex, text) |> Enum.map(fn ["#" <> tag = full_tag | _] -> {full_tag, String.downcase(tag)} end) |> (fn map -> if data["sensitive"] in [true, "True", "true", "1"], do: [{"#nsfw", "nsfw"}] ++ map, else: map end).() end @doc "Parses mentions text and returns list {nickname, user}." @spec parse_mentions(binary()) :: list({binary(), User.t()}) def parse_mentions(text) do Regex.scan(@mentions_regex, text) |> List.flatten() |> Enum.uniq() |> Enum.map(fn nickname -> with nickname <- String.trim_leading(nickname, "@"), do: {"@" <> nickname, User.get_cached_by_nickname(nickname)} end) |> Enum.filter(fn {_match, user} -> user end) end def emojify(text) do emojify(text, Emoji.get_all()) end def emojify(text, nil), do: text def emojify(text, emoji, strip \\ false) do Enum.reduce(emoji, text, fn {emoji, file}, text -> emoji = HTML.strip_tags(emoji) file = HTML.strip_tags(file) String.replace( text, ":#{emoji}:", if not strip do "<img height='32px' width='32px' alt='#{emoji}' title='#{emoji}' src='#{ MediaProxy.url(file) }' />" else "" end ) |> HTML.filter_tags() end) end def demojify(text) do emojify(text, Emoji.get_all(), true) end def demojify(text, nil), do: text def get_emoji(text) when is_binary(text) do Enum.filter(Emoji.get_all(), fn {emoji, _} -> String.contains?(text, ":#{emoji}:") end) end def get_emoji(_), do: [] @link_regex ~r/[0-9a-z+\-\.]+:[0-9a-z$-_.+!*'(),]+/ui @uri_schemes Application.get_env(:pleroma, :uri_schemes, []) @valid_schemes Keyword.get(@uri_schemes, :valid_schemes, []) # TODO: make it use something other than @link_regex def html_escape(text, "text/html") do HTML.filter_tags(text) end def html_escape(text, "text/plain") do Regex.split(@link_regex, text, include_captures: true) |> Enum.map_every(2, fn chunk -> {:safe, part} = Phoenix.HTML.html_escape(chunk) part end) |> Enum.join("") end @doc """ Escapes a special characters in mention names. """ @spec mentions_escape(String.t(), list({String.t(), any()})) :: String.t() def mentions_escape(text, mentions) do mentions |> Enum.reduce(text, fn {name, _}, acc -> escape_name = String.replace(name, @markdown_characters_regex, "\\\\\\1") String.replace(acc, name, escape_name) end) end @doc "changes scheme:... urls to html links" def add_links({subs, text}) do links = text |> String.split([" ", "\t", "<br>"]) |> Enum.filter(fn word -> String.starts_with?(word, @valid_schemes) end) |> Enum.filter(fn word -> Regex.match?(@link_regex, word) end) |> Enum.map(fn url -> {Ecto.UUID.generate(), url} end) |> Enum.sort_by(fn {_, url} -> -String.length(url) end) uuid_text = links |> Enum.reduce(text, fn {uuid, url}, acc -> String.replace(acc, url, uuid) end) subs = subs ++ Enum.map(links, fn {uuid, url} -> {uuid, "<a href=\"#{url}\">#{url}</a>"} end) {subs, uuid_text} end @doc "Adds the links to mentioned users" def add_user_links({subs, text}, mentions, options \\ []) do mentions = mentions |> Enum.sort_by(fn {name, _} -> -String.length(name) end) |> Enum.map(fn {name, user} -> {name, user, Ecto.UUID.generate()} end) uuid_text = mentions |> Enum.reduce(text, fn {match, _user, uuid}, text -> String.replace(text, match, uuid) end) subs = subs ++ Enum.map(mentions, fn {match, %User{id: id, ap_id: ap_id, info: info}, uuid} -> ap_id = if is_binary(info.source_data["url"]) do info.source_data["url"] else ap_id end nickname = if options[:format] == :full do User.full_nickname(match) else User.local_nickname(match) end {uuid, "<span class='h-card'><a data-user='#{id}' class='u-url mention' href='#{ap_id}'>" <> "@<span>#{nickname}</span></a></span>"} end) {subs, uuid_text} end @doc "Adds the hashtag links" def add_hashtag_links({subs, text}, tags) do tags = tags |> Enum.sort_by(fn {name, _} -> -String.length(name) end) |> Enum.map(fn {name, short} -> {name, short, Ecto.UUID.generate()} end) uuid_text = tags |> Enum.reduce(text, fn {match, _short, uuid}, text -> String.replace(text, ~r/((?<=[^&])|(\A))#{match}/, uuid) end) subs = subs ++ Enum.map(tags, fn {tag_text, tag, uuid} -> url = "<a class='hashtag' data-tag='#{tag}' href='#{Pleroma.Web.base_url()}/tag/#{tag}' rel='tag'>#{ tag_text }</a>" {uuid, url} end) {subs, uuid_text} end def finalize({subs, text}) do Enum.reduce(subs, text, fn {uuid, replacement}, result_text -> String.replace(result_text, uuid, replacement) end) end def truncate(text, max_length \\ 200, omission \\ "...") do # Remove trailing whitespace text = Regex.replace(~r/([^ \t\r\n])([ \t]+$)/u, text, "\\g{1}") if String.length(text) < max_length do text else length_with_omission = max_length - String.length(omission) String.slice(text, 0, length_with_omission) <> omission end end end