456 lines
14 KiB
Ruby
456 lines
14 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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GIF_SOURCES_REGEXP = %r{(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_uploads = @post.with_secure_uploads?
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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_dominant_color = !!opts[:disable_dominant_color]
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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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add_blocked_hotlinked_media_placeholders
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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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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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if @has_oneboxes
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BadgeGranter.grant(Badge.find(Badge::FirstOnebox), @post.user, post_id: @post.id)
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end
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if @post.is_reply_by_email?
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BadgeGranter.grant(Badge.find(Badge::FirstReplyByEmail), @post.user, post_id: @post.id)
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end
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end
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def post_process_quotes
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@doc
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.css("aside.quote")
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.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(topic_id.to_i, post_number.to_i, q.css("blockquote").text)
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q["class"] = ((q["class"] || "") + " quote-post-not-found").strip if comparer.missing?
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q["class"] = ((q["class"] || "") + " quote-modified").strip if comparer.modified?
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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 =
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Post
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.where(
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"post_number < ? AND topic_id = ? AND post_type = ? AND NOT hidden",
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@post.post_number,
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@post.topic_id,
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Post.types[:regular],
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)
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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 = %r{\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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{ raw: quoteless_raw, edit_reason: I18n.t(:removed_direct_reply_full_quotes) },
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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 extract_images
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# all images with a src attribute
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@doc.css("img[src], img[#{PrettyText::BLOCKED_HOTLINKED_SRC_ATTR}]") -
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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") - @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 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 =
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(w > 0 && h > 0 && [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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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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upload = Upload.get_from_url(src)
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original_width, original_height = nil
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if (upload.present?)
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original_width = upload.width || 0
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original_height = upload.height || 0
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else
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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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end
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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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if original_width <= SiteSetting.max_image_width &&
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original_height <= SiteSetting.max_image_height
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return
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end
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user_width, user_height = [original_width, original_height] if user_width.to_i <= 0 &&
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user_height.to_i <= 0
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width, height = user_width, user_height
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crop =
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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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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 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 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_uploads?)
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srcset << ", #{cooked_url} #{ratio.to_s.sub(/\.0\z/, "")}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_uploads?)
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srcset << ", #{cooked_url} #{ratio.to_s.sub(/\.0\z/, "")}x"
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end
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img[
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"srcset"
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] = "#{UrlHelper.cook_url(img["src"], secure: @post.with_secure_uploads?)}#{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 !@disable_dominant_color &&
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(color = upload.dominant_color(calculate_if_missing: true).presence)
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img["data-dominant-color"] = color
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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_uploads?)
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a = create_link_node("lightbox", src)
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img.add_next_sibling(a)
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a["data-download-href"] = Discourse.store.download_url(upload) if upload
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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 =~ /\Ablob(\.png)?\z/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 =
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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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if @post.topic.image_upload_id && @post.is_first_post?
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@post.topic.update_column(:image_upload_id, nil)
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end
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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 { |a| a[selector] = UrlHelper.cook_url(a[selector].to_s) }
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end
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%w[src].each do |selector|
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@doc
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.css("img[#{selector}]")
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.each do |img|
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custom_emoji = img["class"]&.include?("emoji-custom") && Emoji.custom?(img["title"])
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img[selector] = UrlHelper.cook_url(
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img[selector].to_s,
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secure: @post.with_secure_uploads? && !custom_emoji,
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)
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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
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.css("a[href]")
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.each do |a|
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uri =
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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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private
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def post_process_images
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extract_images.each do |img|
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still_an_image = process_hotlinked_image(img)
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convert_to_link!(img) if still_an_image
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end
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end
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def process_hotlinked_image(img)
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@hotlinked_map ||= @post.post_hotlinked_media.preload(:upload).map { |r| [r.url, r] }.to_h
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normalized_src =
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PostHotlinkedMedia.normalize_src(img["src"] || img[PrettyText::BLOCKED_HOTLINKED_SRC_ATTR])
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info = @hotlinked_map[normalized_src]
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still_an_image = true
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if info&.too_large?
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if img.ancestors(".onebox, .onebox-body").blank?
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add_large_image_placeholder!(img)
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else
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img.remove
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end
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still_an_image = false
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elsif info&.download_failed?
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if img.ancestors(".onebox, .onebox-body").blank?
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add_broken_image_placeholder!(img)
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else
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img.remove
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end
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still_an_image = false
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elsif info&.downloaded? && upload = info&.upload
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img["src"] = UrlHelper.cook_url(upload.url, secure: @with_secure_uploads)
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img.delete(PrettyText::BLOCKED_HOTLINKED_SRC_ATTR)
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end
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still_an_image
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end
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def add_blocked_hotlinked_media_placeholders
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@doc
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.css(
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[
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"[#{PrettyText::BLOCKED_HOTLINKED_SRC_ATTR}]",
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"[#{PrettyText::BLOCKED_HOTLINKED_SRCSET_ATTR}]",
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].join(","),
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)
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.each do |el|
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src =
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el[PrettyText::BLOCKED_HOTLINKED_SRC_ATTR] ||
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el[PrettyText::BLOCKED_HOTLINKED_SRCSET_ATTR]&.split(",")&.first&.split(" ")&.first
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if el.name == "img"
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add_blocked_hotlinked_image_placeholder!(el)
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next
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end
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el = el.parent if %w[video audio].include?(el.parent.name)
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el = el.parent if el.parent.classes.include?("video-container")
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add_blocked_hotlinked_media_placeholder!(el, src)
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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
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rescue URI::Error
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nil
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end
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File.extname(path) == ".svg" if path
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end
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end
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