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https://github.com/discourse/discourse.git
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350 lines
11 KiB
Ruby
350 lines
11 KiB
Ruby
require "fastimage"
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require_dependency "image_sizer"
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class UploadCreator
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TYPES_CONVERTED_TO_JPEG ||= %i{bmp png}
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TYPES_TO_CROP ||= %w{avatar card_background custom_emoji profile_background}.each(&:freeze)
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WHITELISTED_SVG_ELEMENTS ||= %w{
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circle clippath defs ellipse g line linearGradient path polygon polyline
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radialGradient rect stop svg text textpath tref tspan use
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}.each(&:freeze)
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# Available options
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# - type (string)
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# - origin (string)
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# - for_group_message (boolean)
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# - for_theme (boolean)
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# - for_private_message (boolean)
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# - pasted (boolean)
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# - for_export (boolean)
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def initialize(file, filename, opts = {})
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@file = file
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@filename = (filename || "").gsub(/[^[:print:]]/, "")
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@upload = Upload.new(original_filename: @filename, filesize: 0)
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@opts = opts
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end
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def create_for(user_id)
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if filesize <= 0
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@upload.errors.add(:base, I18n.t("upload.empty"))
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return @upload
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end
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DistributedMutex.synchronize("upload_#{user_id}_#{@filename}") do
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# test for image regardless of input
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@image_info = FastImage.new(@file) rescue nil
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is_image = FileHelper.is_supported_image?(@filename)
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is_image ||= @image_info && FileHelper.is_supported_image?("test.#{@image_info.type}")
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if is_image
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extract_image_info!
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return @upload if @upload.errors.present?
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if @image_info.type.to_s == "svg"
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whitelist_svg!
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elsif !Rails.env.test? || @opts[:force_optimize]
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convert_to_jpeg! if should_convert_to_jpeg?
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downsize! if should_downsize?
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return @upload if is_still_too_big?
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fix_orientation! if should_fix_orientation?
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crop! if should_crop?
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optimize! if should_optimize?
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end
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# conversion may have switched the type
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image_type = @image_info.type.to_s
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end
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# compute the sha of the file
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sha1 = Upload.generate_digest(@file)
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# do we already have that upload?
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@upload = Upload.find_by(sha1: sha1)
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# make sure the previous upload has not failed
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if @upload && @upload.url.blank?
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@upload.destroy
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@upload = nil
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end
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# return the previous upload if any
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if @upload
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UserUpload.find_or_create_by!(user_id: user_id, upload_id: @upload.id) if user_id
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return @upload
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end
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fixed_original_filename = nil
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if is_image
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current_extension = File.extname(@filename).downcase.sub("jpeg", "jpg")
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expected_extension = ".#{image_type}".downcase.sub("jpeg", "jpg")
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# we have to correct original filename here, no choice
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# otherwise validation will fail and we can not save
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# TODO decide if we only run the validation on the extension
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if current_extension != expected_extension
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basename = File.basename(@filename, current_extension).presence || "image"
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fixed_original_filename = "#{basename}#{expected_extension}"
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end
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end
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# create the upload otherwise
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@upload = Upload.new
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@upload.user_id = user_id
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@upload.original_filename = fixed_original_filename || @filename
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@upload.filesize = filesize
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@upload.sha1 = sha1
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@upload.url = ""
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@upload.origin = @opts[:origin][0...1000] if @opts[:origin]
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@upload.extension = image_type || File.extname(@filename)[1..10]
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if is_image
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@upload.thumbnail_width, @upload.thumbnail_height = ImageSizer.resize(*@image_info.size)
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@upload.width, @upload.height = @image_info.size
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end
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@upload.for_private_message = true if @opts[:for_private_message]
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@upload.for_group_message = true if @opts[:for_group_message]
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@upload.for_theme = true if @opts[:for_theme]
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@upload.for_export = true if @opts[:for_export]
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@upload.for_site_setting = true if @opts[:for_site_setting]
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return @upload unless @upload.save
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# store the file and update its url
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File.open(@file.path) do |f|
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url = Discourse.store.store_upload(f, @upload)
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if url.present?
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@upload.url = url
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@upload.save!
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else
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@upload.errors.add(:url, I18n.t("upload.store_failure", upload_id: @upload.id, user_id: user_id))
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end
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end
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if @upload.errors.empty? && is_image && @opts[:type] == "avatar" && @upload.extension != "svg"
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Jobs.enqueue(:create_avatar_thumbnails, upload_id: @upload.id, user_id: user_id)
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end
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if @upload.errors.empty?
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UserUpload.find_or_create_by!(user_id: user_id, upload_id: @upload.id) if user_id
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end
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@upload
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end
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ensure
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@file&.close
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end
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def extract_image_info!
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@image_info = FastImage.new(@file) rescue nil
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@file.rewind
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if @image_info.nil?
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@upload.errors.add(:base, I18n.t("upload.images.not_supported_or_corrupted"))
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elsif filesize <= 0
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@upload.errors.add(:base, I18n.t("upload.empty"))
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elsif pixels == 0
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@upload.errors.add(:base, I18n.t("upload.images.size_not_found"))
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end
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end
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MIN_PIXELS_TO_CONVERT_TO_JPEG ||= 1280 * 720
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def should_convert_to_jpeg?
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return false if !TYPES_CONVERTED_TO_JPEG.include?(@image_info.type)
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return true if @opts[:pasted]
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return false if SiteSetting.png_to_jpg_quality == 100
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pixels > MIN_PIXELS_TO_CONVERT_TO_JPEG
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end
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MIN_CONVERT_TO_JPEG_BYTES_SAVED = 75_000
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MIN_CONVERT_TO_JPEG_SAVING_RATIO = 0.70
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def convert_to_jpeg!
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return if filesize < MIN_CONVERT_TO_JPEG_BYTES_SAVED
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jpeg_tempfile = Tempfile.new(["image", ".jpg"])
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from = @file.path
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to = jpeg_tempfile.path
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OptimizedImage.ensure_safe_paths!(from, to)
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from = OptimizedImage.prepend_decoder!(from, nil, filename: "image.#{@image_info.type}")
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to = OptimizedImage.prepend_decoder!(to)
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begin
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execute_convert(from, to)
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rescue
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# retry with debugging enabled
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execute_convert(from, to, true)
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end
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new_size = File.size(jpeg_tempfile.path)
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keep_jpeg = new_size < filesize * MIN_CONVERT_TO_JPEG_SAVING_RATIO
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keep_jpeg &&= (filesize - new_size) > MIN_CONVERT_TO_JPEG_BYTES_SAVED
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if keep_jpeg
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@file = jpeg_tempfile
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extract_image_info!
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else
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jpeg_tempfile&.close
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end
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end
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def execute_convert(from, to, debug = false)
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command = [
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"convert",
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from,
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"-auto-orient",
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"-background", "white",
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"-interlace", "none",
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"-flatten",
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"-quality", SiteSetting.png_to_jpg_quality.to_s
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]
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command << "-debug" << "all" if debug
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command << to
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Discourse::Utils.execute_command(*command, failure_message: I18n.t("upload.png_to_jpg_conversion_failure_message"))
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end
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def should_downsize?
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max_image_size > 0 && filesize >= max_image_size
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end
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def downsize!
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3.times do
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original_size = filesize
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downsized_pixels = [pixels, max_image_pixels].min / 2
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OptimizedImage.downsize(
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@file.path,
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@file.path,
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"#{downsized_pixels}@",
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filename: @filename,
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allow_animation: allow_animation,
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raise_on_error: true
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)
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extract_image_info!
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return if filesize >= original_size || pixels == 0 || !should_downsize?
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end
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end
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def is_still_too_big?
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if max_image_pixels > 0 && pixels >= max_image_pixels
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@upload.errors.add(:base, I18n.t("upload.images.larger_than_x_megapixels", max_image_megapixels: SiteSetting.max_image_megapixels))
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true
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elsif max_image_size > 0 && filesize >= max_image_size
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@upload.errors.add(:base, I18n.t("upload.images.too_large", max_size_kb: SiteSetting.max_image_size_kb))
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true
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else
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false
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end
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end
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def whitelist_svg!
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doc = Nokogiri::XML(@file)
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doc.xpath(svg_whitelist_xpath).remove
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File.write(@file.path, doc.to_s)
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@file.rewind
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end
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def should_fix_orientation?
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# orientation is between 1 and 8, 1 being the default
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# cf. http://www.daveperrett.com/articles/2012/07/28/exif-orientation-handling-is-a-ghetto/
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@image_info.orientation.to_i > 1
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end
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def fix_orientation!
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path = @file.path
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OptimizedImage.ensure_safe_paths!(path)
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path = OptimizedImage.prepend_decoder!(path, nil, filename: "image.#{@image_info.type}")
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Discourse::Utils.execute_command('convert', path, '-auto-orient', path)
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extract_image_info!
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end
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def should_crop?
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TYPES_TO_CROP.include?(@opts[:type])
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end
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def crop!
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max_pixel_ratio = Discourse::PIXEL_RATIOS.max
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filename_with_correct_ext = "image.#{@image_info.type}"
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case @opts[:type]
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when "avatar"
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width = height = Discourse.avatar_sizes.max
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OptimizedImage.resize(@file.path, @file.path, width, height, filename: filename_with_correct_ext, allow_animation: allow_animation)
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when "profile_background"
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max_width = 850 * max_pixel_ratio
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width, height = ImageSizer.resize(@image_info.size[0], @image_info.size[1], max_width: max_width, max_height: max_width)
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OptimizedImage.downsize(@file.path, @file.path, "#{width}x#{height}\>", filename: filename_with_correct_ext, allow_animation: allow_animation)
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when "card_background"
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max_width = 590 * max_pixel_ratio
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width, height = ImageSizer.resize(@image_info.size[0], @image_info.size[1], max_width: max_width, max_height: max_width)
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OptimizedImage.downsize(@file.path, @file.path, "#{width}x#{height}\>", filename: filename_with_correct_ext, allow_animation: allow_animation)
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when "custom_emoji"
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OptimizedImage.downsize(@file.path, @file.path, "100x100\>", filename: filename_with_correct_ext, allow_animation: allow_animation)
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end
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extract_image_info!
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end
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def should_optimize?
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# GIF is too slow (plus, we'll soon be converting them to MP4)
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# Optimizing SVG is useless
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return false if @file.path =~ /\.(gif|svg)$/i
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# Safeguard for large PNGs
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return pixels < 2_000_000 if @file.path =~ /\.png/i
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# Everything else is fine!
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true
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end
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def optimize!
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OptimizedImage.ensure_safe_paths!(@file.path)
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FileHelper.optimize_image!(@file.path)
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extract_image_info!
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rescue ImageOptim::TimeoutExceeded
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Rails.logger.warn("ImageOptim timed out while optimizing #{@filename}")
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end
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def filesize
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File.size?(@file.path).to_i
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end
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def max_image_size
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@max_image_size ||= SiteSetting.max_image_size_kb.kilobytes
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end
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def max_image_pixels
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@max_image_pixels ||= SiteSetting.max_image_megapixels * 1_000_000
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end
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def pixels
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@image_info.size&.reduce(:*).to_i
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end
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def allow_animation
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@allow_animation ||= @opts[:type] == "avatar" ? SiteSetting.allow_animated_avatars : SiteSetting.allow_animated_thumbnails
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end
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def svg_whitelist_xpath
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@@svg_whitelist_xpath ||= "//*[#{WHITELISTED_SVG_ELEMENTS.map { |e| "name()!='#{e}'" }.join(" and ") }]"
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end
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end
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