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ce0bac7a3d
* use image alt as a fallback when there's no title * update spec we used to check that the overlay information is added when the image has a titie. This adds 2 more scenarios. One where an image has both a title and an alt, in which case the title should be used and alt ignored. The other is when there's only an alt, it should then be used to generate the overlay
714 lines
21 KiB
Ruby
714 lines
21 KiB
Ruby
# frozen_string_literal: true
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# Post processing that we can do after a post has already been cooked.
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# For example, inserting the onebox content, or image sizes/thumbnails.
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class CookedPostProcessor
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INLINE_ONEBOX_LOADING_CSS_CLASS = "inline-onebox-loading"
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INLINE_ONEBOX_CSS_CLASS = "inline-onebox"
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LIGHTBOX_WRAPPER_CSS_CLASS = "lightbox-wrapper"
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LOADING_SIZE = 10
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LOADING_COLORS = 32
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attr_reader :cooking_options, :doc
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def initialize(post, opts = {})
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@dirty = false
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@opts = opts
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@post = post
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@previous_cooked = (@post.cooked || "").dup
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# NOTE: we re-cook the post here in order to prevent timing issues with edits
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# cf. https://meta.discourse.org/t/edit-of-rebaked-post-doesnt-show-in-html-only-in-raw/33815/6
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@cooking_options = post.cooking_options || opts[:cooking_options] || {}
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@cooking_options[:topic_id] = post.topic_id
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@cooking_options = @cooking_options.symbolize_keys
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@doc = Nokogiri::HTML::fragment(post.cook(post.raw, @cooking_options))
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@has_oneboxes = post.post_analyzer.found_oneboxes?
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@size_cache = {}
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@disable_loading_image = !!opts[:disable_loading_image]
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@omit_nofollow = post.omit_nofollow?
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end
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def post_process(bypass_bump: false, new_post: false)
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DistributedMutex.synchronize("post_process_#{@post.id}", validity: 10.minutes) do
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DiscourseEvent.trigger(:before_post_process_cooked, @doc, @post)
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remove_full_quote_on_direct_reply if new_post
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post_process_oneboxes
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post_process_images
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post_process_quotes
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optimize_urls
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remove_user_ids
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update_post_image
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enforce_nofollow
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pull_hotlinked_images(bypass_bump)
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grant_badges
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@post.link_post_uploads(fragments: @doc)
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DiscourseEvent.trigger(:post_process_cooked, @doc, @post)
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nil
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end
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end
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def has_emoji?
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(@doc.css("img.emoji") - @doc.css(".quote img")).size > 0
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end
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def grant_badges
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return unless Guardian.new.can_see?(@post)
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BadgeGranter.grant(Badge.find(Badge::FirstEmoji), @post.user, post_id: @post.id) if has_emoji?
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BadgeGranter.grant(Badge.find(Badge::FirstOnebox), @post.user, post_id: @post.id) if @has_oneboxes
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BadgeGranter.grant(Badge.find(Badge::FirstReplyByEmail), @post.user, post_id: @post.id) if @post.is_reply_by_email?
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end
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def post_process_quotes
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@doc.css("aside.quote").each do |q|
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post_number = q['data-post']
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topic_id = q['data-topic']
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if topic_id && post_number
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comparer = QuoteComparer.new(
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topic_id.to_i,
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post_number.to_i,
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q.css('blockquote').text
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)
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if comparer.modified?
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q['class'] = ((q['class'] || '') + " quote-modified").strip
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end
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end
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end
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end
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def remove_full_quote_on_direct_reply
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return if !SiteSetting.remove_full_quote
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return if @post.post_number == 1
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return if @doc.css("aside.quote").size != 1
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previous = Post
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.where("post_number < ? AND topic_id = ? AND post_type = ? AND NOT hidden", @post.post_number, @post.topic_id, Post.types[:regular])
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.order("post_number DESC")
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.limit(1)
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.pluck(:cooked)
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.first
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return if previous.blank?
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previous_text = Nokogiri::HTML::fragment(previous).text.strip
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quoted_text = @doc.css("aside.quote:first-child blockquote").first&.text&.strip || ""
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return if previous_text.gsub(/(\s){2,}/, '\1') != quoted_text.gsub(/(\s){2,}/, '\1')
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quote_regexp = /\A\s*\[quote.+?\[\/quote\]/im
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quoteless_raw = @post.raw.sub(quote_regexp, "").strip
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return if @post.raw.strip == quoteless_raw
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PostRevisor.new(@post).revise!(
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Discourse.system_user,
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{
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raw: quoteless_raw,
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edit_reason: I18n.t(:removed_direct_reply_full_quotes)
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},
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skip_validations: true,
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bypass_bump: true
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)
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end
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def add_image_placeholder!(img)
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src = img["src"].sub(/^https?:/i, "")
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if large_images.include?(src)
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return add_large_image_placeholder!(img)
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elsif broken_images.include?(src)
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return add_broken_image_placeholder!(img)
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end
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false
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end
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def add_large_image_placeholder!(img)
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url = img["src"]
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is_hyperlinked = is_a_hyperlink?(img)
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placeholder = create_node("div", "large-image-placeholder")
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img.add_next_sibling(placeholder)
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placeholder.add_child(img)
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a = create_link_node(nil, url, true)
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img.add_next_sibling(a)
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span = create_span_node("url", url)
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a.add_child(span)
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span.add_previous_sibling(create_icon_node("far-image"))
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span.add_next_sibling(create_span_node("help", I18n.t("upload.placeholders.too_large", max_size_kb: SiteSetting.max_image_size_kb)))
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# Only if the image is already linked
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if is_hyperlinked
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parent = placeholder.parent
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parent.add_next_sibling(placeholder)
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if parent.name == 'a' && parent["href"].present?
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if url == parent["href"]
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parent.remove
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else
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parent["class"] = "link"
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a.add_previous_sibling(parent)
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lspan = create_span_node("url", parent["href"])
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parent.add_child(lspan)
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lspan.add_previous_sibling(create_icon_node("link"))
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end
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end
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end
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img.remove
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true
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end
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def add_broken_image_placeholder!(img)
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img.name = "span"
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img.set_attribute("class", "broken-image")
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img.set_attribute("title", I18n.t("post.image_placeholder.broken"))
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img << "<svg class=\"fa d-icon d-icon-unlink svg-icon\" aria-hidden=\"true\"><use xlink:href=\"#unlink\"></use></svg>"
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img.remove_attribute("src")
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img.remove_attribute("width")
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img.remove_attribute("height")
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true
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end
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def large_images
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@large_images ||=
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begin
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JSON.parse(@post.custom_fields[Post::LARGE_IMAGES].presence || "[]")
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rescue JSON::ParserError
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[]
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end
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end
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def broken_images
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@broken_images ||=
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begin
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JSON.parse(@post.custom_fields[Post::BROKEN_IMAGES].presence || "[]")
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rescue JSON::ParserError
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[]
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end
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end
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def downloaded_images
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@downloaded_images ||= @post.downloaded_images
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end
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def extract_images
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# all images with a src attribute
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@doc.css("img[src]") -
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# minus data images
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@doc.css("img[src^='data']") -
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# minus emojis
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@doc.css("img.emoji") -
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# minus oneboxed images
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oneboxed_images -
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# minus images inside quotes
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@doc.css(".quote img")
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end
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def extract_images_for_post
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# all images with a src attribute
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@doc.css("img[src]") -
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# minus emojis
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@doc.css("img.emoji") -
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# minus images inside quotes
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@doc.css(".quote img")
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end
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def oneboxed_images
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@doc.css(".onebox-body img, .onebox img, img.onebox")
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end
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def limit_size!(img)
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# retrieve the size from
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# 1) the width/height attributes
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# 2) the dimension from the preview (image_sizes)
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# 3) the dimension of the original image (HTTP request)
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w, h = get_size_from_attributes(img) ||
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get_size_from_image_sizes(img["src"], @opts[:image_sizes]) ||
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get_size(img["src"])
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# limit the size of the thumbnail
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img["width"], img["height"] = ImageSizer.resize(w, h)
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end
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def get_size_from_attributes(img)
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w, h = img["width"].to_i, img["height"].to_i
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return [w, h] unless w <= 0 || h <= 0
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# if only width or height are specified attempt to scale image
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if w > 0 || h > 0
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w = w.to_f
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h = h.to_f
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return unless original_image_size = get_size(img["src"])
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original_width, original_height = original_image_size.map(&:to_f)
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if w > 0
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ratio = w / original_width
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[w.floor, (original_height * ratio).floor]
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else
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ratio = h / original_height
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[(original_width * ratio).floor, h.floor]
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end
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end
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end
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def get_size_from_image_sizes(src, image_sizes)
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return unless image_sizes.present?
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image_sizes.each do |image_size|
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url, size = image_size[0], image_size[1]
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if url && url.include?(src) &&
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size && size["width"].to_i > 0 && size["height"].to_i > 0
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return [size["width"], size["height"]]
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end
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end
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end
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def add_to_size_cache(url, w, h)
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@size_cache[url] = [w, h]
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end
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def get_size(url)
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return @size_cache[url] if @size_cache.has_key?(url)
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absolute_url = url
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absolute_url = Discourse.base_url_no_prefix + absolute_url if absolute_url =~ /^\/[^\/]/
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return unless absolute_url
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# FastImage fails when there's no scheme
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absolute_url = SiteSetting.scheme + ":" + absolute_url if absolute_url.start_with?("//")
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return unless is_valid_image_url?(absolute_url)
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# we can *always* crawl our own images
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return unless SiteSetting.crawl_images? || Discourse.store.has_been_uploaded?(url)
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@size_cache[url] = FastImage.size(absolute_url)
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rescue Zlib::BufError, URI::Error, OpenSSL::SSL::SSLError
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# FastImage.size raises BufError for some gifs, leave it.
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end
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def is_valid_image_url?(url)
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uri = URI.parse(url)
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%w(http https).include? uri.scheme
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rescue URI::Error
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end
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def convert_to_link!(img)
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src = img["src"]
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return if src.blank? || is_a_hyperlink?(img) || is_svg?(img)
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width, height = img["width"].to_i, img["height"].to_i
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# TODO: store original dimentions in db
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original_width, original_height = (get_size(src) || [0, 0]).map(&:to_i)
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# can't reach the image...
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if original_width == 0 || original_height == 0
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Rails.logger.info "Can't reach '#{src}' to get its dimension."
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return
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end
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return if original_width <= width && original_height <= height
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return if original_width <= SiteSetting.max_image_width && original_height <= SiteSetting.max_image_height
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crop = SiteSetting.min_ratio_to_crop > 0
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crop &&= original_width.to_f / original_height.to_f < SiteSetting.min_ratio_to_crop
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if crop
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width, height = ImageSizer.crop(original_width, original_height)
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img["width"] = width
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img["height"] = height
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end
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if upload = Upload.get_from_url(src)
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upload.create_thumbnail!(width, height, crop: crop)
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each_responsive_ratio do |ratio|
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resized_w = (width * ratio).to_i
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resized_h = (height * ratio).to_i
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if upload.width && resized_w <= upload.width
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upload.create_thumbnail!(resized_w, resized_h, crop: crop)
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end
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end
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unless @disable_loading_image
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upload.create_thumbnail!(LOADING_SIZE, LOADING_SIZE, format: 'png', colors: LOADING_COLORS)
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end
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end
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add_lightbox!(img, original_width, original_height, upload, cropped: crop)
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end
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def loading_image(upload)
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upload.thumbnail(LOADING_SIZE, LOADING_SIZE)
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end
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def is_a_hyperlink?(img)
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parent = img.parent
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while parent
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return true if parent.name == "a"
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parent = parent.parent if parent.respond_to?(:parent)
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end
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false
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end
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def each_responsive_ratio
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SiteSetting
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.responsive_post_image_sizes
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.split('|')
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.map(&:to_f)
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.sort
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.each { |r| yield r if r > 1 }
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end
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def add_lightbox!(img, original_width, original_height, upload, cropped: false)
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# first, create a div to hold our lightbox
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lightbox = create_node("div", LIGHTBOX_WRAPPER_CSS_CLASS)
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img.add_next_sibling(lightbox)
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lightbox.add_child(img)
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# then, the link to our larger image
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a = create_link_node("lightbox", img["src"])
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img.add_next_sibling(a)
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if upload
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a["data-download-href"] = Discourse.store.download_url(upload)
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end
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a.add_child(img)
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# replace the image by its thumbnail
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w, h = img["width"].to_i, img["height"].to_i
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if upload
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thumbnail = upload.thumbnail(w, h)
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if thumbnail && thumbnail.filesize.to_i < upload.filesize
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img["src"] = thumbnail.url
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srcset = +""
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each_responsive_ratio do |ratio|
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resized_w = (w * ratio).to_i
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resized_h = (h * ratio).to_i
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if !cropped && upload.width && resized_w > upload.width
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cooked_url = UrlHelper.cook_url(upload.url)
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srcset << ", #{cooked_url} #{ratio.to_s.sub(/\.0$/, "")}x"
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elsif t = upload.thumbnail(resized_w, resized_h)
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cooked_url = UrlHelper.cook_url(t.url)
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srcset << ", #{cooked_url} #{ratio.to_s.sub(/\.0$/, "")}x"
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end
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img["srcset"] = "#{UrlHelper.cook_url(img["src"])}#{srcset}" if srcset.present?
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end
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else
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img["src"] = upload.url
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end
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if small_upload = loading_image(upload)
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img["data-small-upload"] = small_upload.url
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end
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end
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# then, some overlay informations
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meta = create_node("div", "meta")
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img.add_next_sibling(meta)
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filename = get_filename(upload, img["src"])
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informations = +"#{original_width}×#{original_height}"
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informations << " #{upload.human_filesize}" if upload
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a["title"] = CGI.escapeHTML(img["title"] || img["alt"] || filename)
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meta.add_child create_icon_node("far-image")
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meta.add_child create_span_node("filename", a["title"])
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meta.add_child create_span_node("informations", informations)
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meta.add_child create_icon_node("discourse-expand")
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end
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def get_filename(upload, src)
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return File.basename(src) unless upload
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return upload.original_filename unless upload.original_filename =~ /^blob(\.png)?$/i
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return I18n.t("upload.pasted_image_filename")
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end
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def create_node(tag_name, klass)
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node = Nokogiri::XML::Node.new(tag_name, @doc)
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node["class"] = klass if klass.present?
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node
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end
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def create_span_node(klass, content = nil)
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span = create_node("span", klass)
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span.content = content if content
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span
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end
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def create_icon_node(klass)
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icon = create_node("svg", "fa d-icon d-icon-#{klass} svg-icon")
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icon.set_attribute("aria-hidden", "true")
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icon << "<use xlink:href=\"##{klass}\"></use>"
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end
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def create_link_node(klass, url, external = false)
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a = create_node("a", klass)
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a["href"] = url
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if external
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a["target"] = "_blank"
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a["rel"] = "nofollow noopener"
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end
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a
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end
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def update_post_image
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img = extract_images_for_post.first
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return if img.blank?
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if img["src"].present?
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@post.update_column(:image_url, img["src"][0...255]) # post
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@post.topic.update_column(:image_url, img["src"][0...255]) if @post.is_first_post? # topic
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end
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end
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def post_process_oneboxes
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limit = SiteSetting.max_oneboxes_per_post
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oneboxes = {}
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inlineOneboxes = {}
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Oneboxer.apply(@doc, extra_paths: [".#{INLINE_ONEBOX_LOADING_CSS_CLASS}"]) do |url, element|
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is_onebox = element["class"] == Oneboxer::ONEBOX_CSS_CLASS
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map = is_onebox ? oneboxes : inlineOneboxes
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skip_onebox = limit <= 0 && !map[url]
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if skip_onebox
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if is_onebox
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element.remove_class('onebox')
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else
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remove_inline_onebox_loading_class(element)
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end
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|
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next
|
||
end
|
||
|
||
limit -= 1
|
||
map[url] = true
|
||
|
||
if is_onebox
|
||
onebox = Oneboxer.onebox(url,
|
||
invalidate_oneboxes: !!@opts[:invalidate_oneboxes],
|
||
user_id: @post&.user_id,
|
||
category_id: @post&.topic&.category_id
|
||
)
|
||
|
||
@has_oneboxes = true if onebox.present?
|
||
onebox
|
||
else
|
||
process_inline_onebox(element)
|
||
false
|
||
end
|
||
end
|
||
|
||
oneboxed_images.each do |img|
|
||
next if img["src"].blank?
|
||
|
||
src = img["src"].sub(/^https?:/i, "")
|
||
parent = img.parent
|
||
img_classes = (img["class"] || "").split(" ")
|
||
link_classes = ((parent&.name == "a" && parent["class"]) || "").split(" ")
|
||
|
||
if img_classes.include?("onebox") || link_classes.include?("onebox")
|
||
next if add_image_placeholder!(img)
|
||
elsif large_images.include?(src) || broken_images.include?(src)
|
||
img.remove
|
||
next
|
||
end
|
||
|
||
upload_id = downloaded_images[src]
|
||
upload = Upload.find_by_id(upload_id) if upload_id
|
||
img["src"] = upload.url if upload.present?
|
||
|
||
# make sure we grab dimensions for oneboxed images
|
||
# and wrap in a div
|
||
limit_size!(img)
|
||
|
||
next if img["class"]&.include?('onebox-avatar')
|
||
|
||
parent = parent&.parent if parent&.name == "a"
|
||
parent_class = parent && parent["class"]
|
||
width = img["width"].to_i
|
||
height = img["height"].to_i
|
||
|
||
if parent_class&.include?("onebox-body") && width > 0 && height > 0
|
||
# special instruction for width == height, assume we are dealing with an avatar
|
||
if (img["width"].to_i == img["height"].to_i)
|
||
found = false
|
||
parent = img
|
||
while parent = parent.parent
|
||
if parent["class"] && parent["class"].include?("whitelistedgeneric")
|
||
found = true
|
||
break
|
||
end
|
||
end
|
||
|
||
if found
|
||
img["class"] = img["class"].to_s + " onebox-avatar"
|
||
next
|
||
end
|
||
end
|
||
|
||
if width < 64 && height < 64
|
||
img["class"] = img["class"].to_s + " onebox-full-image"
|
||
else
|
||
img.delete('width')
|
||
img.delete('height')
|
||
new_parent = img.add_next_sibling("<div class='aspect-image' style='--aspect-ratio:#{width}/#{height};'/>")
|
||
new_parent.first.add_child(img)
|
||
end
|
||
elsif (parent_class&.include?("instagram-images") || parent_class&.include?("tweet-images") || parent_class&.include?("scale-images")) && width > 0 && height > 0
|
||
img.remove_attribute("width")
|
||
img.remove_attribute("height")
|
||
parent["class"] = "aspect-image-full-size"
|
||
parent["style"] = "--aspect-ratio:#{width}/#{height};"
|
||
end
|
||
end
|
||
|
||
if @omit_nofollow || !SiteSetting.add_rel_nofollow_to_user_content
|
||
@doc.css(".onebox-body a, .onebox a").each { |a| a.remove_attribute("rel") }
|
||
end
|
||
end
|
||
|
||
def optimize_urls
|
||
%w{href data-download-href}.each do |selector|
|
||
@doc.css("a[#{selector}]").each do |a|
|
||
a[selector] = UrlHelper.cook_url(a[selector].to_s)
|
||
end
|
||
end
|
||
|
||
%w{src data-small-upload}.each do |selector|
|
||
@doc.css("img[#{selector}]").each do |img|
|
||
img[selector] = UrlHelper.cook_url(img[selector].to_s)
|
||
end
|
||
end
|
||
end
|
||
|
||
def remove_user_ids
|
||
@doc.css("a[href]").each do |a|
|
||
uri = begin
|
||
URI(a["href"])
|
||
rescue URI::Error
|
||
next
|
||
end
|
||
next if uri.hostname != Discourse.current_hostname
|
||
|
||
query = Rack::Utils.parse_nested_query(uri.query)
|
||
next if !query.delete("u")
|
||
|
||
uri.query = query.map { |k, v| "#{k}=#{v}" }.join("&").presence
|
||
a["href"] = uri.to_s
|
||
end
|
||
end
|
||
|
||
def enforce_nofollow
|
||
if !@omit_nofollow && SiteSetting.add_rel_nofollow_to_user_content
|
||
PrettyText.add_rel_nofollow_to_user_content(@doc)
|
||
end
|
||
end
|
||
|
||
def pull_hotlinked_images(bypass_bump = false)
|
||
# have we enough disk space?
|
||
disable_if_low_on_disk_space # But still enqueue the job
|
||
# don't download remote images for posts that are more than n days old
|
||
return unless @post.created_at > (Date.today - SiteSetting.download_remote_images_max_days_old)
|
||
# we only want to run the job whenever it's changed by a user
|
||
return if @post.last_editor_id && @post.last_editor_id <= 0
|
||
# make sure no other job is scheduled
|
||
Jobs.cancel_scheduled_job(:pull_hotlinked_images, post_id: @post.id)
|
||
# schedule the job
|
||
delay = SiteSetting.editing_grace_period + 1
|
||
Jobs.enqueue_in(delay.seconds.to_i, :pull_hotlinked_images, post_id: @post.id, bypass_bump: bypass_bump)
|
||
end
|
||
|
||
def disable_if_low_on_disk_space
|
||
return false if !SiteSetting.download_remote_images_to_local
|
||
return false if available_disk_space >= SiteSetting.download_remote_images_threshold
|
||
return false if Discourse.store.external?
|
||
|
||
SiteSetting.download_remote_images_to_local = false
|
||
# log the site setting change
|
||
reason = I18n.t("disable_remote_images_download_reason")
|
||
staff_action_logger = StaffActionLogger.new(Discourse.system_user)
|
||
staff_action_logger.log_site_setting_change("download_remote_images_to_local", true, false, details: reason)
|
||
|
||
# also send a private message to the site contact user
|
||
notify_about_low_disk_space
|
||
|
||
true
|
||
end
|
||
|
||
def notify_about_low_disk_space
|
||
SystemMessage.create_from_system_user(Discourse.site_contact_user, :download_remote_images_disabled)
|
||
end
|
||
|
||
def available_disk_space
|
||
100 - `df -P #{Rails.root}/public/uploads | tail -1 | tr -s ' ' | cut -d ' ' -f 5`.to_i
|
||
end
|
||
|
||
def dirty?
|
||
@previous_cooked != html
|
||
end
|
||
|
||
def html
|
||
@doc.try(:to_html)
|
||
end
|
||
|
||
private
|
||
|
||
def post_process_images
|
||
extract_images.each do |img|
|
||
unless add_image_placeholder!(img)
|
||
limit_size!(img)
|
||
convert_to_link!(img)
|
||
end
|
||
end
|
||
end
|
||
|
||
def process_inline_onebox(element)
|
||
inline_onebox = InlineOneboxer.lookup(
|
||
element.attributes["href"].value,
|
||
invalidate: !!@opts[:invalidate_oneboxes]
|
||
)
|
||
|
||
if title = inline_onebox&.dig(:title)
|
||
element.children = CGI.escapeHTML(title)
|
||
element.add_class(INLINE_ONEBOX_CSS_CLASS)
|
||
end
|
||
|
||
remove_inline_onebox_loading_class(element)
|
||
end
|
||
|
||
def remove_inline_onebox_loading_class(element)
|
||
element.remove_class(INLINE_ONEBOX_LOADING_CSS_CLASS)
|
||
end
|
||
|
||
def is_svg?(img)
|
||
path =
|
||
begin
|
||
URI(img["src"]).path
|
||
rescue URI::Error
|
||
nil
|
||
end
|
||
|
||
File.extname(path) == '.svg' if path
|
||
end
|
||
|
||
end
|