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+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