499 lines
15 KiB
Ruby
499 lines
15 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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include CookedProcessorMixin
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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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GIF_SOURCES_REGEXP = /(giphy|tenor)\.com\//
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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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@model = 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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@with_secure_media = @post.with_secure_media?
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@category_id = @post&.topic&.category_id
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cooked = post.cook(post.raw, @cooking_options)
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@doc = Loofah.fragment(cooked)
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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(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
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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 if @post.user.blank? || !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.xpath("aside[contains(@class, '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::HTML5::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(
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create_span_node(
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"help",
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I18n.t(
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"upload.placeholders.too_large_humanized",
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max_size: ActiveSupport::NumberHelper.number_to_human_size(SiteSetting.max_image_size_kb.kilobytes)
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)
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)
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)
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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 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 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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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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# minus onebox site icons
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@doc.css("img.site-icon") -
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# minus onebox avatars
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@doc.css("img.onebox-avatar") -
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@doc.css("img.onebox-avatar-inline") -
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# minus github onebox profile images
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@doc.css(".onebox.githubfolder img")
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end
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def large_images
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@large_images ||= @post&.custom_fields[Post::LARGE_IMAGES].presence || []
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end
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def broken_images
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@broken_images ||= @post&.custom_fields[Post::BROKEN_IMAGES].presence || []
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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 convert_to_link!(img)
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w, h = img["width"].to_i, img["height"].to_i
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user_width, user_height = (w > 0 && h > 0 && [w, h]) ||
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get_size_from_attributes(img) ||
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get_size_from_image_sizes(img["src"], @opts[:image_sizes])
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limit_size!(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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original_width, original_height = (get_size(src) || [0, 0]).map(&:to_i)
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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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upload = Upload.get_from_url(src)
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if (upload.present? && upload.animated?) || src.match?(GIF_SOURCES_REGEXP)
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img.add_class("animated")
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end
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return if original_width <= SiteSetting.max_image_width && original_height <= SiteSetting.max_image_height
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user_width, user_height = [original_width, original_height] if user_width.to_i <= 0 && user_height.to_i <= 0
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width, height = user_width, user_height
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crop = SiteSetting.min_ratio_to_crop > 0 && width.to_f / height.to_f < SiteSetting.min_ratio_to_crop
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if crop
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width, height = ImageSizer.crop(width, height)
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img["width"], img["height"] = width, height
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else
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width, height = ImageSizer.resize(width, height)
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end
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if upload.present?
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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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return if upload.animated?
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if img.ancestors('.onebox, .onebox-body, .quote').blank? && !img.classes.include?("onebox")
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add_lightbox!(img, original_width, original_height, upload, cropped: crop)
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end
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optimize_image!(img, upload, cropped: crop)
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end
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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 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 optimize_image!(img, upload, cropped: false)
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w, h = img["width"].to_i, img["height"].to_i
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# note: optimize_urls cooks the src and data-small-upload further after this
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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, secure: @post.with_secure_media?)
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srcset << ", #{cooked_url} #{ratio.to_s.sub(/\.0$/, "")}x"
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elsif t = upload.thumbnail(resized_w, resized_h)
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cooked_url = UrlHelper.cook_url(t.url, secure: @post.with_secure_media?)
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srcset << ", #{cooked_url} #{ratio.to_s.sub(/\.0$/, "")}x"
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end
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img["srcset"] = "#{UrlHelper.cook_url(img["src"], secure: @post.with_secure_media?)}#{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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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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src = UrlHelper.cook_url(img["src"], secure: @post.with_secure_media?)
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a = create_link_node("lightbox", 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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# 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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I18n.t("upload.pasted_image_filename")
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end
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def update_post_image
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upload = nil
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images = extract_images_for_post
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@post.each_upload_url(fragments: images.css("[data-thumbnail]")) do |src, path, sha1|
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upload = Upload.find_by(sha1: sha1)
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break if upload
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end
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if upload.nil? # No specified thumbnail. Use any image:
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@post.each_upload_url(fragments: images.css(":not([data-thumbnail])")) do |src, path, sha1|
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upload = Upload.find_by(sha1: sha1)
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break if upload
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end
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end
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if upload.present?
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@post.update_column(:image_upload_id, upload.id) # post
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if @post.is_first_post? # topic
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@post.topic.update_column(:image_upload_id, upload.id)
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extra_sizes = ThemeModifierHelper.new(theme_ids: Theme.user_selectable.pluck(:id)).topic_thumbnail_sizes
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@post.topic.generate_thumbnails!(extra_sizes: extra_sizes)
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end
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else
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@post.update_column(:image_upload_id, nil) if @post.image_upload_id
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@post.topic.update_column(:image_upload_id, nil) if @post.topic.image_upload_id && @post.is_first_post?
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nil
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end
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end
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def optimize_urls
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%w{href data-download-href}.each do |selector|
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@doc.css("a[#{selector}]").each do |a|
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a[selector] = UrlHelper.cook_url(a[selector].to_s)
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end
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end
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%w{src data-small-upload}.each do |selector|
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@doc.css("img[#{selector}]").each do |img|
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img[selector] = UrlHelper.cook_url(img[selector].to_s, secure: @post.with_secure_media?)
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end
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end
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end
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def remove_user_ids
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@doc.css("a[href]").each do |a|
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uri = begin
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URI(a["href"])
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rescue URI::Error
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next
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end
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next if uri.hostname != Discourse.current_hostname
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query = Rack::Utils.parse_nested_query(uri.query)
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next if !query.delete("u")
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uri.query = query.map { |k, v| "#{k}=#{v}" }.join("&").presence
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a["href"] = uri.to_s
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end
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end
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def enforce_nofollow
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add_nofollow = !@omit_nofollow && SiteSetting.add_rel_nofollow_to_user_content
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PrettyText.add_rel_attributes_to_user_content(@doc, add_nofollow)
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end
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def pull_hotlinked_images
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return if @opts[:skip_pull_hotlinked_images]
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# have we enough disk space?
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disable_if_low_on_disk_space # But still enqueue the job
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# make sure no other job is scheduled
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Jobs.cancel_scheduled_job(:pull_hotlinked_images, post_id: @post.id)
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# schedule the job
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delay = SiteSetting.editing_grace_period + 1
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Jobs.enqueue_in(delay.seconds.to_i, :pull_hotlinked_images, post_id: @post.id)
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end
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def disable_if_low_on_disk_space
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return if Discourse.store.external?
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return if !SiteSetting.download_remote_images_to_local
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return if available_disk_space >= SiteSetting.download_remote_images_threshold
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SiteSetting.download_remote_images_to_local = false
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# log the site setting change
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reason = I18n.t("disable_remote_images_download_reason")
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staff_action_logger = StaffActionLogger.new(Discourse.system_user)
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staff_action_logger.log_site_setting_change("download_remote_images_to_local", true, false, details: reason)
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# also send a private message to the site contact user notify_about_low_disk_space
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notify_about_low_disk_space
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end
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def notify_about_low_disk_space
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SystemMessage.create_from_system_user(Discourse.site_contact_user, :download_remote_images_disabled)
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end
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def available_disk_space
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100 - DiskSpace.percent_free("#{Rails.root}/public/uploads")
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end
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private
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def post_process_images
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extract_images.each do |img|
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convert_to_link!(img) unless add_image_placeholder!(img)
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end
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end
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def is_svg?(img)
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path =
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begin
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||
URI(img["src"]).path
|
||
rescue URI::Error
|
||
nil
|
||
end
|
||
|
||
File.extname(path) == '.svg' if path
|
||
end
|
||
end
|