+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
defmodule Pleroma.HTML do
alias HtmlSanitizeEx.Scrubber
- @markup Application.get_env(:pleroma, :markup)
-
defp get_scrubbers(scrubber) when is_atom(scrubber), do: [scrubber]
defp get_scrubbers(scrubbers) when is_list(scrubbers), do: scrubbers
defp get_scrubbers(_), do: [Pleroma.HTML.Scrubber.Default]
- def get_scrubbers() do
- Keyword.get(@markup, :scrub_policy)
+ def get_scrubbers do
+ Pleroma.Config.get([:markup, :scrub_policy])
|> get_scrubbers
end
- def filter_tags(html, scrubber) do
- html |> Scrubber.scrub(scrubber)
+ def filter_tags(html, nil) do
+ filter_tags(html, get_scrubbers())
end
- def filter_tags(html) do
- get_scrubbers()
- |> Enum.reduce(html, fn scrubber, html ->
+ def filter_tags(html, scrubbers) when is_list(scrubbers) do
+ Enum.reduce(scrubbers, html, fn scrubber, html ->
filter_tags(html, scrubber)
end)
end
- def strip_tags(html) do
- html |> Scrubber.scrub(Scrubber.StripTags)
+ def filter_tags(html, scrubber), do: Scrubber.scrub(html, scrubber)
+ def filter_tags(html), do: filter_tags(html, nil)
+ def strip_tags(html), do: Scrubber.scrub(html, Scrubber.StripTags)
+
+ def get_cached_scrubbed_html_for_activity(
+ content,
+ scrubbers,
+ activity,
+ key \\ "",
+ callback \\ fn x -> x end
+ ) do
+ key = "#{key}#{generate_scrubber_signature(scrubbers)}|#{activity.id}"
+
+ Cachex.fetch!(:scrubber_cache, key, fn _key ->
+ object = Pleroma.Object.normalize(activity)
+ ensure_scrubbed_html(content, scrubbers, object.data["fake"] || false, callback)
+ end)
+ end
+
+ def get_cached_stripped_html_for_activity(content, activity, key) do
+ get_cached_scrubbed_html_for_activity(
+ content,
+ HtmlSanitizeEx.Scrubber.StripTags,
+ activity,
+ key,
+ &HtmlEntities.decode/1
+ )
+ end
+
+ def ensure_scrubbed_html(
+ content,
+ scrubbers,
+ fake,
+ callback
+ ) do
+ content =
+ content
+ |> filter_tags(scrubbers)
+ |> callback.()
+
+ if fake do
+ {:ignore, content}
+ else
+ {:commit, content}
+ end
+ end
+
+ defp generate_scrubber_signature(scrubber) when is_atom(scrubber) do
+ generate_scrubber_signature([scrubber])
+ end
+
+ defp generate_scrubber_signature(scrubbers) do
+ Enum.reduce(scrubbers, "", fn scrubber, signature ->
+ "#{signature}#{to_string(scrubber)}"
+ end)
+ end
+
+ def extract_first_external_url(_, nil), do: {:error, "No content"}
+
+ def extract_first_external_url(object, content) do
+ key = "URL|#{object.id}"
+
+ Cachex.fetch!(:scrubber_cache, key, fn _key ->
+ result =
+ content
+ |> Floki.filter_out("a.mention")
+ |> Floki.attribute("a", "href")
+ |> Enum.at(0)
+
+ {:commit, {:ok, result}}
+ end)
end
end
paragraphs, breaks and links are allowed through the filter.
"""
+ @valid_schemes Pleroma.Config.get([:uri_schemes, :valid_schemes], [])
+
require HtmlSanitizeEx.Scrubber.Meta
alias HtmlSanitizeEx.Scrubber.Meta
- @valid_schemes ["http", "https"]
-
Meta.remove_cdata_sections_before_scrub()
Meta.strip_comments()
# links
- Meta.allow_tag_with_uri_attributes("a", ["href"], @valid_schemes)
+ Meta.allow_tag_with_uri_attributes("a", ["href", "data-user", "data-tag"], @valid_schemes)
+
+ Meta.allow_tag_with_this_attribute_values("a", "class", [
+ "hashtag",
+ "u-url",
+ "mention",
+ "u-url mention",
+ "mention u-url"
+ ])
+
+ Meta.allow_tag_with_this_attribute_values("a", "rel", [
+ "tag",
+ "nofollow",
+ "noopener",
+ "noreferrer"
+ ])
+
Meta.allow_tag_with_these_attributes("a", ["name", "title"])
# paragraphs and linebreaks
Meta.allow_tag_with_these_attributes("p", [])
# microformats
+ Meta.allow_tag_with_this_attribute_values("span", "class", ["h-card"])
Meta.allow_tag_with_these_attributes("span", [])
# allow inline images for custom emoji
- @markup Application.get_env(:pleroma, :markup)
- @allow_inline_images Keyword.get(@markup, :allow_inline_images)
-
- if @allow_inline_images do
- Meta.allow_tag_with_uri_attributes("img", ["src"], @valid_schemes)
+ if Pleroma.Config.get([:markup, :allow_inline_images]) do
+ # restrict img tags to http/https only, because of MediaProxy.
+ Meta.allow_tag_with_uri_attributes("img", ["src"], ["http", "https"])
Meta.allow_tag_with_these_attributes("img", [
"width",
"height",
+ "class",
"title",
"alt"
])
end
+
+ Meta.strip_everything_not_covered()
end
defmodule Pleroma.HTML.Scrubber.Default do
require HtmlSanitizeEx.Scrubber.Meta
alias HtmlSanitizeEx.Scrubber.Meta
+ # credo:disable-for-previous-line
+ # No idea how to fix this one…
- @valid_schemes ["http", "https"]
+ @valid_schemes Pleroma.Config.get([:uri_schemes, :valid_schemes], [])
Meta.remove_cdata_sections_before_scrub()
Meta.strip_comments()
- Meta.allow_tag_with_uri_attributes("a", ["href"], @valid_schemes)
+ Meta.allow_tag_with_uri_attributes("a", ["href", "data-user", "data-tag"], @valid_schemes)
+
+ Meta.allow_tag_with_this_attribute_values("a", "class", [
+ "hashtag",
+ "u-url",
+ "mention",
+ "u-url mention",
+ "mention u-url"
+ ])
+
+ Meta.allow_tag_with_this_attribute_values("a", "rel", [
+ "tag",
+ "nofollow",
+ "noopener",
+ "noreferrer"
+ ])
+
Meta.allow_tag_with_these_attributes("a", ["name", "title"])
+ Meta.allow_tag_with_these_attributes("abbr", ["title"])
+
Meta.allow_tag_with_these_attributes("b", [])
Meta.allow_tag_with_these_attributes("blockquote", [])
Meta.allow_tag_with_these_attributes("br", [])
Meta.allow_tag_with_these_attributes("ol", [])
Meta.allow_tag_with_these_attributes("p", [])
Meta.allow_tag_with_these_attributes("pre", [])
- Meta.allow_tag_with_these_attributes("span", [])
Meta.allow_tag_with_these_attributes("strong", [])
Meta.allow_tag_with_these_attributes("u", [])
Meta.allow_tag_with_these_attributes("ul", [])
- @markup Application.get_env(:pleroma, :markup)
- @allow_inline_images Keyword.get(@markup, :allow_inline_images)
+ Meta.allow_tag_with_this_attribute_values("span", "class", ["h-card"])
+ Meta.allow_tag_with_these_attributes("span", [])
+
+ @allow_inline_images Pleroma.Config.get([:markup, :allow_inline_images])
if @allow_inline_images do
- Meta.allow_tag_with_uri_attributes("img", ["src"], @valid_schemes)
+ # restrict img tags to http/https only, because of MediaProxy.
+ Meta.allow_tag_with_uri_attributes("img", ["src"], ["http", "https"])
Meta.allow_tag_with_these_attributes("img", [
"width",
"height",
+ "class",
"title",
"alt"
])
end
- @allow_tables Keyword.get(@markup, :allow_tables)
-
- if @allow_tables do
+ if Pleroma.Config.get([:markup, :allow_tables]) do
Meta.allow_tag_with_these_attributes("table", [])
Meta.allow_tag_with_these_attributes("tbody", [])
Meta.allow_tag_with_these_attributes("td", [])
Meta.allow_tag_with_these_attributes("tr", [])
end
- @allow_headings Keyword.get(@markup, :allow_headings)
-
- if @allow_headings do
+ if Pleroma.Config.get([:markup, :allow_headings]) do
Meta.allow_tag_with_these_attributes("h1", [])
Meta.allow_tag_with_these_attributes("h2", [])
Meta.allow_tag_with_these_attributes("h3", [])
Meta.allow_tag_with_these_attributes("h5", [])
end
- @allow_fonts Keyword.get(@markup, :allow_fonts)
-
- if @allow_fonts do
+ if Pleroma.Config.get([:markup, :allow_fonts]) do
Meta.allow_tag_with_these_attributes("font", ["face"])
end
Meta.strip_everything_not_covered()
end
+
+defmodule Pleroma.HTML.Transform.MediaProxy do
+ @moduledoc "Transforms inline image URIs to use MediaProxy."
+
+ alias Pleroma.Web.MediaProxy
+
+ def before_scrub(html), do: html
+
+ def scrub_attribute("img", {"src", "http" <> target}) do
+ media_url =
+ ("http" <> target)
+ |> MediaProxy.url()
+
+ {"src", media_url}
+ end
+
+ def scrub_attribute(_tag, attribute), do: attribute
+
+ def scrub({"img", attributes, children}) do
+ attributes =
+ attributes
+ |> Enum.map(fn attr -> scrub_attribute("img", attr) end)
+ |> Enum.reject(&is_nil(&1))
+
+ {"img", attributes, children}
+ end
+
+ def scrub({:comment, _children}), do: ""
+
+ def scrub({tag, attributes, children}), do: {tag, attributes, children}
+ def scrub({_tag, children}), do: children
+ def scrub(text), do: text
+end
projects / akkoma / blobdiff