145 lines
4.3 KiB
Elixir
145 lines
4.3 KiB
Elixir
# Portions of this file are derived from Pleroma:
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social>
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# SPDX-License-Identifier: AGPL-3.0-only
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# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/formatter.ex
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defmodule Mobilizon.Service.Formatter do
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@moduledoc """
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Formats input text to structured data, extracts mentions and hashtags.
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"""
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alias Mobilizon.Actors
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alias Mobilizon.Actors.Actor
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alias Mobilizon.Service.Formatter.HTML
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alias Phoenix.HTML.Tag
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alias Mobilizon.Web.Endpoint
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@link_regex ~r"((?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~%:/?#[\]@!\$&'\(\)\*\+,;=.]+)|[0-9a-z+\-\.]+:[0-9a-z$-_.+!*'(),]+"ui
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@markdown_characters_regex ~r/(`|\*|_|{|}|[|]|\(|\)|#|\+|-|\.|!)/
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def escape_mention_handler("@" <> nickname = mention, buffer, _, _) do
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case Actors.get_actor_by_name(nickname) do
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%Actor{} ->
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# escape markdown characters with `\\`
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# (we don't want something like @user__name to be parsed by markdown)
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String.replace(mention, @markdown_characters_regex, "\\\\\\1")
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_ ->
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buffer
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end
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end
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def mention_handler("@" <> nickname, buffer, _opts, acc) do
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case Actors.get_actor_by_name(nickname) do
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# %Actor{preferred_username: preferred_username} = actor ->
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# link = "<span class='h-card mention'>@<span>#{preferred_username}</span></span>"
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#
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# {link, %{acc | mentions: MapSet.put(acc.mentions, {"@" <> nickname, actor})}}
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%Actor{type: :Person, id: id, preferred_username: preferred_username} = actor ->
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# link =
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# "<span class='h-card mention' data-user='#{id}'>@<span>#{preferred_username}</span></span>"
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link =
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Tag.content_tag(
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:span,
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[
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"@",
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Tag.content_tag(
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:span,
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preferred_username
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)
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],
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"data-user": id,
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class: "h-card mention"
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)
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|> Phoenix.HTML.safe_to_string()
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{link, %{acc | mentions: MapSet.put(acc.mentions, {"@" <> nickname, actor})}}
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_ ->
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{buffer, acc}
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end
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end
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def hashtag_handler("#" <> tag = tag_text, _buffer, _opts, acc) do
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tag = String.downcase(tag)
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url = "#{Endpoint.url()}/tag/#{tag}"
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link = "<a class='hashtag' data-tag='#{tag}' href='#{url}' rel='tag'>#{tag_text}</a>"
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{link, %{acc | tags: MapSet.put(acc.tags, {tag_text, tag})}}
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end
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@doc """
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Parses a text and replace plain text links with HTML. Returns a tuple with a result text, mentions, and hashtags.
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"""
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@spec linkify(String.t(), keyword()) ::
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{String.t(), [{String.t(), Actor.t()}], [{String.t(), String.t()}]}
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def linkify(text, options \\ []) do
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options = linkify_opts() ++ options
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acc = %{mentions: MapSet.new(), tags: MapSet.new()}
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{text, %{mentions: mentions, tags: tags}} = Linkify.link_map(text, acc, options)
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{text, MapSet.to_list(mentions), MapSet.to_list(tags)}
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end
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@doc """
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Escapes a special characters in mention names.
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"""
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def mentions_escape(text, options \\ []) do
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options =
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Keyword.merge(options,
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mention: true,
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url: false,
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mention_handler: &escape_mention_handler/4
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)
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Linkify.link(text, options)
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end
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def html_escape({text, mentions, hashtags}, type) do
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{html_escape(text, type), mentions, hashtags}
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end
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def html_escape(text, "text/html") do
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with {:ok, content} <- HTML.filter_tags(text) do
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content
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end
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end
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def html_escape(text, "text/plain") do
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@link_regex
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|> Regex.split(text, include_captures: true)
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|> Enum.map_every(2, fn chunk ->
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{:safe, part} = Phoenix.HTML.html_escape(chunk)
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part
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end)
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|> Enum.join("")
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end
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def truncate(text, max_length \\ 200, omission \\ "...") do
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# Remove trailing whitespace
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text = Regex.replace(~r/([^ \t\r\n])([ \t]+$)/u, text, "\\g{1}")
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if String.length(text) < max_length do
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text
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else
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length_with_omission = max_length - String.length(omission)
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String.slice(text, 0, length_with_omission) <> omission
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end
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end
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defp linkify_opts do
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Mobilizon.Config.get(__MODULE__) ++
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[
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hashtag: true,
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hashtag_handler: &__MODULE__.hashtag_handler/4,
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mention: true,
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mention_handler: &__MODULE__.mention_handler/4
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]
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end
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end
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