forked from AkkomaGang/akkoma
HTML: Compile Scrubbers on boot
This makes it possible to configure their behavior on OTP releases.
This commit is contained in:
rinpatch
parent
af5fef1f22
commit
d6c89068f3
8 changed files with 231 additions and 214 deletions
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@ -1,3 +1,3 @@
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[
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[
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inputs: ["mix.exs", "{config,lib,test}/**/*.{ex,exs}", "priv/repo/migrations/*.exs"]
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inputs: ["mix.exs", "{config,lib,test}/**/*.{ex,exs}", "priv/repo/migrations/*.exs", "priv/scrubbers/*.ex"]
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]
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]
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@ -82,6 +82,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
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- Report emails now include functional links to profiles of remote user accounts
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- Report emails now include functional links to profiles of remote user accounts
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- Not being able to log in to some third-party apps when logged in to MastoFE
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- Not being able to log in to some third-party apps when logged in to MastoFE
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- MRF: `Delete` activities being exempt from MRF policies
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- MRF: `Delete` activities being exempt from MRF policies
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- OTP releases: Not being able to configure HTML sanitization policy
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<details>
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<details>
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<summary>API Changes</summary>
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<summary>API Changes</summary>
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@ -30,6 +30,7 @@ def user_agent do
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# See http://elixir-lang.org/docs/stable/elixir/Application.html
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# See http://elixir-lang.org/docs/stable/elixir/Application.html
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# for more information on OTP Applications
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# for more information on OTP Applications
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def start(_type, _args) do
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def start(_type, _args) do
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Pleroma.HTML.compile_scrubbers()
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Pleroma.Config.DeprecationWarnings.warn()
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Pleroma.Config.DeprecationWarnings.warn()
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setup_instrumenters()
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setup_instrumenters()
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@ -3,6 +3,25 @@
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# SPDX-License-Identifier: AGPL-3.0-only
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.HTML do
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defmodule Pleroma.HTML do
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# Scrubbers are compiled on boot so they can be configured in OTP releases
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# @on_load :compile_scrubbers
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def compile_scrubbers do
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dir = Path.join(:code.priv_dir(:pleroma), "scrubbers")
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dir
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|> File.ls!()
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|> Enum.map(&Path.join(dir, &1))
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|> Kernel.ParallelCompiler.compile()
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|> case do
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{:error, _errors, _warnings} ->
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raise "Compiling scrubbers failed"
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{:ok, _modules, _warnings} ->
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:ok
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end
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end
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defp get_scrubbers(scrubber) when is_atom(scrubber), do: [scrubber]
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defp get_scrubbers(scrubber) when is_atom(scrubber), do: [scrubber]
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defp get_scrubbers(scrubbers) when is_list(scrubbers), do: scrubbers
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defp get_scrubbers(scrubbers) when is_list(scrubbers), do: scrubbers
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defp get_scrubbers(_), do: [Pleroma.HTML.Scrubber.Default]
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defp get_scrubbers(_), do: [Pleroma.HTML.Scrubber.Default]
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@ -99,216 +118,3 @@ def extract_first_external_url(object, content) do
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end)
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end)
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end
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end
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end
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end
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defmodule Pleroma.HTML.Scrubber.TwitterText do
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@moduledoc """
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An HTML scrubbing policy which limits to twitter-style text. Only
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paragraphs, breaks and links are allowed through the filter.
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"""
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@valid_schemes Pleroma.Config.get([:uri_schemes, :valid_schemes], [])
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require FastSanitize.Sanitizer.Meta
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alias FastSanitize.Sanitizer.Meta
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Meta.strip_comments()
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# links
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Meta.allow_tag_with_uri_attributes(:a, ["href", "data-user", "data-tag"], @valid_schemes)
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Meta.allow_tag_with_this_attribute_values(:a, "class", [
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"hashtag",
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"u-url",
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"mention",
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"u-url mention",
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"mention u-url"
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])
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Meta.allow_tag_with_this_attribute_values(:a, "rel", [
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"tag",
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"nofollow",
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"noopener",
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"noreferrer"
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])
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Meta.allow_tag_with_these_attributes(:a, ["name", "title"])
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# paragraphs and linebreaks
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Meta.allow_tag_with_these_attributes(:br, [])
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Meta.allow_tag_with_these_attributes(:p, [])
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# microformats
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Meta.allow_tag_with_this_attribute_values(:span, "class", ["h-card"])
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Meta.allow_tag_with_these_attributes(:span, [])
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# allow inline images for custom emoji
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if Pleroma.Config.get([:markup, :allow_inline_images]) do
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# restrict img tags to http/https only, because of MediaProxy.
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Meta.allow_tag_with_uri_attributes(:img, ["src"], ["http", "https"])
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Meta.allow_tag_with_these_attributes(:img, [
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"width",
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"height",
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"class",
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"title",
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"alt"
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])
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end
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Meta.strip_everything_not_covered()
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end
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defmodule Pleroma.HTML.Scrubber.Default do
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@doc "The default HTML scrubbing policy: no "
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require FastSanitize.Sanitizer.Meta
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alias FastSanitize.Sanitizer.Meta
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# credo:disable-for-previous-line
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# No idea how to fix this one…
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@valid_schemes Pleroma.Config.get([:uri_schemes, :valid_schemes], [])
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Meta.strip_comments()
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Meta.allow_tag_with_uri_attributes(:a, ["href", "data-user", "data-tag"], @valid_schemes)
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Meta.allow_tag_with_this_attribute_values(:a, "class", [
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"hashtag",
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"u-url",
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"mention",
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"u-url mention",
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"mention u-url"
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])
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Meta.allow_tag_with_this_attribute_values(:a, "rel", [
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"tag",
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"nofollow",
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"noopener",
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"noreferrer",
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"ugc"
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])
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Meta.allow_tag_with_these_attributes(:a, ["name", "title"])
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Meta.allow_tag_with_these_attributes(:abbr, ["title"])
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Meta.allow_tag_with_these_attributes(:b, [])
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Meta.allow_tag_with_these_attributes(:blockquote, [])
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Meta.allow_tag_with_these_attributes(:br, [])
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Meta.allow_tag_with_these_attributes(:code, [])
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Meta.allow_tag_with_these_attributes(:del, [])
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Meta.allow_tag_with_these_attributes(:em, [])
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Meta.allow_tag_with_these_attributes(:i, [])
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Meta.allow_tag_with_these_attributes(:li, [])
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Meta.allow_tag_with_these_attributes(:ol, [])
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Meta.allow_tag_with_these_attributes(:p, [])
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Meta.allow_tag_with_these_attributes(:pre, [])
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Meta.allow_tag_with_these_attributes(:strong, [])
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Meta.allow_tag_with_these_attributes(:sub, [])
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Meta.allow_tag_with_these_attributes(:sup, [])
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Meta.allow_tag_with_these_attributes(:u, [])
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Meta.allow_tag_with_these_attributes(:ul, [])
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Meta.allow_tag_with_this_attribute_values(:span, "class", ["h-card"])
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Meta.allow_tag_with_these_attributes(:span, [])
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@allow_inline_images Pleroma.Config.get([:markup, :allow_inline_images])
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if @allow_inline_images do
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# restrict img tags to http/https only, because of MediaProxy.
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Meta.allow_tag_with_uri_attributes(:img, ["src"], ["http", "https"])
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Meta.allow_tag_with_these_attributes(:img, [
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"width",
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"height",
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"class",
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"title",
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"alt"
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])
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end
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if Pleroma.Config.get([:markup, :allow_tables]) do
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Meta.allow_tag_with_these_attributes(:table, [])
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Meta.allow_tag_with_these_attributes(:tbody, [])
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Meta.allow_tag_with_these_attributes(:td, [])
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Meta.allow_tag_with_these_attributes(:th, [])
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Meta.allow_tag_with_these_attributes(:thead, [])
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Meta.allow_tag_with_these_attributes(:tr, [])
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end
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if Pleroma.Config.get([:markup, :allow_headings]) do
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Meta.allow_tag_with_these_attributes(:h1, [])
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Meta.allow_tag_with_these_attributes(:h2, [])
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Meta.allow_tag_with_these_attributes(:h3, [])
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Meta.allow_tag_with_these_attributes(:h4, [])
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Meta.allow_tag_with_these_attributes(:h5, [])
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end
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if Pleroma.Config.get([:markup, :allow_fonts]) do
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Meta.allow_tag_with_these_attributes(:font, ["face"])
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end
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Meta.strip_everything_not_covered()
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end
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defmodule Pleroma.HTML.Transform.MediaProxy do
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@moduledoc "Transforms inline image URIs to use MediaProxy."
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alias Pleroma.Web.MediaProxy
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def before_scrub(html), do: html
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def scrub_attribute(:img, {"src", "http" <> target}) do
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media_url =
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("http" <> target)
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|> MediaProxy.url()
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{"src", media_url}
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end
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def scrub_attribute(_tag, attribute), do: attribute
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def scrub({:img, attributes, children}) do
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attributes =
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attributes
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|> Enum.map(fn attr -> scrub_attribute(:img, attr) end)
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|> Enum.reject(&is_nil(&1))
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{:img, attributes, children}
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end
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def scrub({:comment, _text, _children}), do: ""
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def scrub({tag, attributes, children}), do: {tag, attributes, children}
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def scrub({_tag, children}), do: children
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def scrub(text), do: text
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end
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defmodule Pleroma.HTML.Scrubber.LinksOnly do
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@moduledoc """
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An HTML scrubbing policy which limits to links only.
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"""
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@valid_schemes Pleroma.Config.get([:uri_schemes, :valid_schemes], [])
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require FastSanitize.Sanitizer.Meta
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alias FastSanitize.Sanitizer.Meta
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Meta.strip_comments()
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# links
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Meta.allow_tag_with_uri_attributes(:a, ["href"], @valid_schemes)
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Meta.allow_tag_with_this_attribute_values(:a, "rel", [
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"tag",
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"nofollow",
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"noopener",
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"noreferrer",
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"me",
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"ugc"
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])
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Meta.allow_tag_with_these_attributes(:a, ["name", "title"])
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Meta.strip_everything_not_covered()
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end
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93
priv/scrubbers/default.ex
Normal file
93
priv/scrubbers/default.ex
Normal file
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@ -0,0 +1,93 @@
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defmodule Pleroma.HTML.Scrubber.Default do
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@doc "The default HTML scrubbing policy: no "
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require FastSanitize.Sanitizer.Meta
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alias FastSanitize.Sanitizer.Meta
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# credo:disable-for-previous-line
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# No idea how to fix this one…
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@valid_schemes Pleroma.Config.get([:uri_schemes, :valid_schemes], [])
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Meta.strip_comments()
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Meta.allow_tag_with_uri_attributes(:a, ["href", "data-user", "data-tag"], @valid_schemes)
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Meta.allow_tag_with_this_attribute_values(:a, "class", [
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"hashtag",
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"u-url",
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"mention",
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"u-url mention",
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"mention u-url"
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])
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Meta.allow_tag_with_this_attribute_values(:a, "rel", [
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"tag",
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"nofollow",
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"noopener",
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"noreferrer",
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"ugc"
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])
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Meta.allow_tag_with_these_attributes(:a, ["name", "title"])
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Meta.allow_tag_with_these_attributes(:abbr, ["title"])
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Meta.allow_tag_with_these_attributes(:b, [])
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Meta.allow_tag_with_these_attributes(:blockquote, [])
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Meta.allow_tag_with_these_attributes(:br, [])
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Meta.allow_tag_with_these_attributes(:code, [])
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Meta.allow_tag_with_these_attributes(:del, [])
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Meta.allow_tag_with_these_attributes(:em, [])
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Meta.allow_tag_with_these_attributes(:i, [])
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Meta.allow_tag_with_these_attributes(:li, [])
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Meta.allow_tag_with_these_attributes(:ol, [])
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Meta.allow_tag_with_these_attributes(:p, [])
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Meta.allow_tag_with_these_attributes(:pre, [])
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Meta.allow_tag_with_these_attributes(:strong, [])
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Meta.allow_tag_with_these_attributes(:sub, [])
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Meta.allow_tag_with_these_attributes(:sup, [])
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Meta.allow_tag_with_these_attributes(:u, [])
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Meta.allow_tag_with_these_attributes(:ul, [])
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Meta.allow_tag_with_this_attribute_values(:span, "class", ["h-card"])
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Meta.allow_tag_with_these_attributes(:span, [])
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@allow_inline_images Pleroma.Config.get([:markup, :allow_inline_images])
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if @allow_inline_images do
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# restrict img tags to http/https only, because of MediaProxy.
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Meta.allow_tag_with_uri_attributes(:img, ["src"], ["http", "https"])
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Meta.allow_tag_with_these_attributes(:img, [
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"width",
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"height",
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"class",
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"title",
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"alt"
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])
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end
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if Pleroma.Config.get([:markup, :allow_tables]) do
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Meta.allow_tag_with_these_attributes(:table, [])
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Meta.allow_tag_with_these_attributes(:tbody, [])
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Meta.allow_tag_with_these_attributes(:td, [])
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Meta.allow_tag_with_these_attributes(:th, [])
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Meta.allow_tag_with_these_attributes(:thead, [])
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Meta.allow_tag_with_these_attributes(:tr, [])
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end
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if Pleroma.Config.get([:markup, :allow_headings]) do
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Meta.allow_tag_with_these_attributes(:h1, [])
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Meta.allow_tag_with_these_attributes(:h2, [])
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Meta.allow_tag_with_these_attributes(:h3, [])
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Meta.allow_tag_with_these_attributes(:h4, [])
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Meta.allow_tag_with_these_attributes(:h5, [])
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end
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if Pleroma.Config.get([:markup, :allow_fonts]) do
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Meta.allow_tag_with_these_attributes(:font, ["face"])
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end
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||||||
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Meta.strip_everything_not_covered()
|
||||||
|
end
|
||||||
27
priv/scrubbers/links_only.ex
Normal file
27
priv/scrubbers/links_only.ex
Normal file
|
|
@ -0,0 +1,27 @@
|
||||||
|
defmodule Pleroma.HTML.Scrubber.LinksOnly do
|
||||||
|
@moduledoc """
|
||||||
|
An HTML scrubbing policy which limits to links only.
|
||||||
|
"""
|
||||||
|
|
||||||
|
@valid_schemes Pleroma.Config.get([:uri_schemes, :valid_schemes], [])
|
||||||
|
|
||||||
|
require FastSanitize.Sanitizer.Meta
|
||||||
|
alias FastSanitize.Sanitizer.Meta
|
||||||
|
|
||||||
|
Meta.strip_comments()
|
||||||
|
|
||||||
|
# links
|
||||||
|
Meta.allow_tag_with_uri_attributes(:a, ["href"], @valid_schemes)
|
||||||
|
|
||||||
|
Meta.allow_tag_with_this_attribute_values(:a, "rel", [
|
||||||
|
"tag",
|
||||||
|
"nofollow",
|
||||||
|
"noopener",
|
||||||
|
"noreferrer",
|
||||||
|
"me",
|
||||||
|
"ugc"
|
||||||
|
])
|
||||||
|
|
||||||
|
Meta.allow_tag_with_these_attributes(:a, ["name", "title"])
|
||||||
|
Meta.strip_everything_not_covered()
|
||||||
|
end
|
||||||
32
priv/scrubbers/media_proxy.ex
Normal file
32
priv/scrubbers/media_proxy.ex
Normal file
|
|
@ -0,0 +1,32 @@
|
||||||
|
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, _text, _children}), do: ""
|
||||||
|
|
||||||
|
def scrub({tag, attributes, children}), do: {tag, attributes, children}
|
||||||
|
def scrub({_tag, children}), do: children
|
||||||
|
def scrub(text), do: text
|
||||||
|
end
|
||||||
57
priv/scrubbers/twitter_text.ex
Normal file
57
priv/scrubbers/twitter_text.ex
Normal file
|
|
@ -0,0 +1,57 @@
|
||||||
|
defmodule Pleroma.HTML.Scrubber.TwitterText do
|
||||||
|
@moduledoc """
|
||||||
|
An HTML scrubbing policy which limits to twitter-style text. Only
|
||||||
|
paragraphs, breaks and links are allowed through the filter.
|
||||||
|
"""
|
||||||
|
|
||||||
|
@valid_schemes Pleroma.Config.get([:uri_schemes, :valid_schemes], [])
|
||||||
|
|
||||||
|
require FastSanitize.Sanitizer.Meta
|
||||||
|
alias FastSanitize.Sanitizer.Meta
|
||||||
|
|
||||||
|
Meta.strip_comments()
|
||||||
|
|
||||||
|
# links
|
||||||
|
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(:br, [])
|
||||||
|
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
|
||||||
|
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
|
||||||
Loading…
Reference in a new issue