409 lines
13 KiB
Ruby
409 lines
13 KiB
Ruby
# 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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require_dependency 'url_helper'
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require_dependency 'pretty_text'
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class CookedPostProcessor
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include ActionView::Helpers::NumberHelper
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attr_reader :cooking_options
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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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@cooking_options[:omit_nofollow] = true if post.omit_nofollow?
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@cooking_options[:cook_method] = post.cook_method
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analyzer = post.post_analyzer
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@doc = Nokogiri::HTML::fragment(analyzer.cook(post.raw, @cooking_options))
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@has_oneboxes = analyzer.found_oneboxes?
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@size_cache = {}
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end
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def post_process(bypass_bump = false)
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DistributedMutex.synchronize("post_process_#{@post.id}") do
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DiscourseEvent.trigger(:before_post_process_cooked, @doc, @post)
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keep_reverse_index_up_to_date
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post_process_images
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post_process_oneboxes
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optimize_urls
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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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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 keep_reverse_index_up_to_date
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upload_ids = []
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@doc.css("a/@href", "img/@src").each do |media|
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if upload = Upload.get_from_url(media.value)
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upload_ids << upload.id
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end
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end
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upload_ids |= oneboxed_image_uploads.pluck(:id)
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values = upload_ids.map { |u| "(#{@post.id},#{u})" }.join(",")
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PostUpload.transaction do
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PostUpload.where(post_id: @post.id).delete_all
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if upload_ids.length > 0
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PostUpload.exec_sql("INSERT INTO post_uploads (post_id, upload_id) VALUES #{values}")
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end
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end
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end
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def post_process_images
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images = extract_images
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return if images.blank?
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images.each do |img|
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limit_size!(img)
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convert_to_link!(img)
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end
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end
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def extract_images
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# all image 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, image inside oneboxes
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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 image 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")
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end
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def oneboxed_image_uploads
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urls = Set.new
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oneboxed_images.each do |img|
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url = img["src"].sub(/^https?:/i, "")
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urls << url
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urls << "http:#{url}"
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urls << "https:#{url}"
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end
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Upload.where(origin: urls.to_a)
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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 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 # FastImage.size raises BufError for some gifs
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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::InvalidURIError
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end
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# only crop when the image is taller than 16:9
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# we only use 95% of that to allow for a small margin
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MIN_RATIO_TO_CROP ||= (9.0 / 16.0) * 0.95
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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)
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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 = false
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if original_width.to_f / original_height.to_f < MIN_RATIO_TO_CROP
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crop = true
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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)
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end
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add_lightbox!(img, original_width, original_height, upload)
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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 add_lightbox!(img, original_width, original_height, upload = nil)
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# first, create a div to hold our lightbox
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lightbox = Nokogiri::XML::Node.new("div", @doc)
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lightbox["class"] = "lightbox-wrapper"
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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 = Nokogiri::XML::Node.new("a", @doc)
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img.add_next_sibling(a)
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if upload && Discourse.store.internal?
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a["data-download-href"] = Discourse.store.download_url(upload)
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end
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a["href"] = img["src"]
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a["class"] = "lightbox"
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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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img["src"] = upload.thumbnail(w, h).url if upload && upload.has_thumbnail?(w, h)
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# then, some overlay informations
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meta = Nokogiri::XML::Node.new("div", @doc)
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meta["class"] = "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}x#{original_height}"
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informations << " #{number_to_human_size(upload.filesize)}" if upload
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a["title"] = CGI.escapeHTML(img["title"] || filename)
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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_span_node("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_span_node(klass, content = nil)
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span = Nokogiri::XML::Node.new("span", @doc)
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span.content = content if content
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span["class"] = klass
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span
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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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args = {
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post_id: @post.id,
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invalidate_oneboxes: !!@opts[:invalidate_oneboxes],
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}
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# apply oneboxes
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Oneboxer.apply(@doc, topic_id: @post.topic_id) do |url|
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@has_oneboxes = true
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Oneboxer.onebox(url, args)
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end
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uploads = oneboxed_image_uploads.select(:url, :origin)
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oneboxed_images.each do |img|
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url = img["src"].sub(/^https?:/i, "")
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upload = uploads.find { |u| u.origin.sub(/^https?:/i, "") == url }
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img["src"] = upload.url if upload.present?
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end
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# make sure we grab dimensions for oneboxed images
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oneboxed_images.each { |img| limit_size!(img) }
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end
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def optimize_urls
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# attachments can't be on the CDN when either setting is enabled
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if SiteSetting.login_required || SiteSetting.prevent_anons_from_downloading_files
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@doc.css("a.attachment[href]").each do |a|
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href = a["href"].to_s
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a["href"] = UrlHelper.schemaless UrlHelper.absolute_without_cdn(href) if UrlHelper.is_local(href)
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end
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end
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use_s3_cdn = SiteSetting.Upload.enable_s3_uploads && SiteSetting.Upload.s3_cdn_url.present?
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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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href = a[selector].to_s
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a[selector] = UrlHelper.schemaless UrlHelper.absolute(href) if UrlHelper.is_local(href)
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a[selector] = Discourse.store.cdn_url(a[selector]) if use_s3_cdn
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end
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end
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@doc.css("img[src]").each do |img|
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src = img["src"].to_s
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img["src"] = UrlHelper.schemaless UrlHelper.absolute(src) if UrlHelper.is_local(src)
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img["src"] = Discourse.store.cdn_url(img["src"]) if use_s3_cdn
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end
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end
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def enforce_nofollow
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if !@cooking_options[:omit_nofollow] && SiteSetting.add_rel_nofollow_to_user_content
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PrettyText.add_rel_nofollow_to_user_content(@doc)
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end
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end
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def pull_hotlinked_images(bypass_bump = false)
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# is the job enabled?
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return unless SiteSetting.download_remote_images_to_local?
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# have we enough disk space?
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return if disable_if_low_on_disk_space
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# don't download remote images for posts that are more than n days old
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return unless @post.created_at > (Date.today - SiteSetting.download_remote_images_max_days_old)
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# we only want to run the job whenever it's changed by a user
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return if @post.last_editor_id == Discourse.system_user.id
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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, bypass_bump: bypass_bump)
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end
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def disable_if_low_on_disk_space
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return false 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
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notify_about_low_disk_space
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true
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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 - `df -P #{Rails.root}/public/uploads | tail -1 | tr -s ' ' | cut -d ' ' -f 5`.to_i
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end
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def dirty?
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@previous_cooked != html
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end
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def html
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@doc.try(:to_html)
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end
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end
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