685 lines
20 KiB
Ruby
685 lines
20 KiB
Ruby
# frozen_string_literal: true
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require "fastimage"
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class UploadCreator
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TYPES_TO_CROP ||= %w[avatar card_background custom_emoji profile_background].each(&:freeze)
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ALLOWED_SVG_ELEMENTS ||= %w[
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circle
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clipPath
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defs
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ellipse
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feGaussianBlur
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filter
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g
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line
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linearGradient
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marker
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path
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polygon
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polyline
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radialGradient
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rect
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stop
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style
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svg
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text
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textPath
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tref
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tspan
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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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# - for_gravatar (boolean)
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# - skip_validations (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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@filesize = @opts[:filesize] if @opts[:external_upload_too_big]
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@opts[:validate] = (
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if opts[:skip_validations].present?
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!ActiveRecord::Type::Boolean.new.cast(opts[:skip_validations])
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else
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true
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end
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)
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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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@image_info =
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begin
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FastImage.new(@file)
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rescue StandardError
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nil
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end
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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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is_image = false if @opts[:for_theme]
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is_thumbnail = SiteSetting.video_thumbnails_enabled && @opts[:type] == "thumbnail"
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# If this is present then it means we are creating an upload record from
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# an external_upload_stub and the file is > ExternalUploadManager::DOWNLOAD_LIMIT,
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# so we have not downloaded it to a tempfile. no modifications can be made to the
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# file in this case because it does not exist; we simply move it to its new location
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# in S3
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#
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# FIXME: I've added a bunch of external_upload_too_big checks littered
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# throughout the UploadCreator code. It would be better to have two separate
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# classes with shared methods, rather than doing all these checks all over the
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# place. Needs a refactor.
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external_upload_too_big = @opts[:external_upload_too_big]
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sha1_before_changes = Upload.generate_digest(@file) if @file
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DistributedMutex.synchronize("upload_#{user_id}_#{@filename}") do
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# We need to convert HEIFs early because FastImage does not consider them as images
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if convert_heif_to_jpeg? && !external_upload_too_big
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convert_heif!
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is_image = FileHelper.is_supported_image?("test.#{@image_info.type}")
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end
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if is_image && !external_upload_too_big
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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 == :svg
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clean_svg!
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elsif @image_info.type == :ico
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convert_favicon_to_png!
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elsif !Rails.env.test? || @opts[:force_optimize]
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convert_to_jpeg! if convert_png_to_jpeg? || should_alter_quality?
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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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downsize! if should_downsize?
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return @upload if is_still_too_big?
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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 and generate a unique hash
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# which is only used for secure uploads
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sha1 = Upload.generate_digest(@file) if !external_upload_too_big
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unique_hash = generate_fake_sha1_hash if SiteSetting.secure_uploads ||
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external_upload_too_big || is_thumbnail
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# we do not check for duplicate uploads if secure uploads is
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# enabled because we use a unique access hash to differentiate
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# between uploads instead of the sha1, and to get around various
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# access/permission issues for uploads
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# We do not check for duplicate uploads for video thumbnails because
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# their filename needs to match with their corresponding video. This also
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# enables rebuilding the html on a topic to regenerate a thumbnail.
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if !SiteSetting.secure_uploads && !external_upload_too_big && !is_thumbnail
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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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add_metadata!
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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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end
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fixed_original_filename = nil
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if is_image && !external_upload_too_big
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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 =
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(
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if (SiteSetting.secure_uploads? || external_upload_too_big || is_thumbnail)
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unique_hash
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else
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sha1
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end
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)
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@upload.original_sha1 = SiteSetting.secure_uploads? ? sha1 : nil
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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 && !external_upload_too_big
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if @image_info.type.to_s == "svg"
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w, h = [0, 0]
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# identify can behave differently depending on how it's compiled and
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# what programs (e.g. inkscape) are installed on your system.
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# 'MSVG:' forces ImageMagick to use internal routines and behave
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# consistently whether it's running from our docker container or not
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begin
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w, h =
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Discourse::Utils
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.execute_command(
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"identify",
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"-ping",
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"-format",
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"%w %h",
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"MSVG:#{@file.path}",
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timeout: Upload::MAX_IDENTIFY_SECONDS,
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)
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.split(" ")
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.map(&:to_i)
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rescue StandardError
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# use default 0, 0
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end
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else
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w, h = @image_info.size
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end
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@upload.thumbnail_width, @upload.thumbnail_height = ImageSizer.resize(w, h)
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@upload.width, @upload.height = w, h
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@upload.animated = animated?
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@upload.calculate_dominant_color!(@file.path)
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end
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add_metadata!
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if SiteSetting.secure_uploads
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secure, reason =
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UploadSecurity.new(@upload, @opts.merge(creating: true)).should_be_secure_with_reason
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attrs = @upload.secure_params(secure, reason, "upload creator")
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@upload.assign_attributes(attrs)
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end
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# Callbacks using this event to validate the upload or the file must add errors to the
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# upload errors object.
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#
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# Can't do any validation of the file if external_upload_too_big because we don't have
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# the actual file.
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if !external_upload_too_big
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DiscourseEvent.trigger(:before_upload_creation, @file, is_image, @upload, @opts[:validate])
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end
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return @upload unless @upload.errors.empty? && @upload.save(validate: @opts[:validate])
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should_move = false
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upload_changed =
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if external_upload_too_big
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false
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else
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Upload.generate_digest(@file) != sha1_before_changes
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end
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store = Discourse.store
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if @opts[:existing_external_upload_key] && store.external?
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should_move = external_upload_too_big || !upload_changed
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end
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if should_move
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# move the file in the store instead of reuploading
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url =
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store.move_existing_stored_upload(
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existing_external_upload_key: @opts[:existing_external_upload_key],
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upload: @upload,
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)
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else
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# store the file and update its url
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File.open(@file.path) { |f| url = store.store_upload(f, @upload) }
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if @opts[:existing_external_upload_key]
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store.delete_file(@opts[:existing_external_upload_key])
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end
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end
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if url.present?
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@upload.url = url
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@upload.save!(validate: @opts[:validate])
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else
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@upload.errors.add(
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:url,
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I18n.t("upload.store_failure", upload_id: @upload.id, user_id: user_id),
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)
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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)
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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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if @file
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@file.respond_to?(:close!) ? @file.close! : @file.close
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end
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end
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def extract_image_info!
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@image_info =
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begin
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FastImage.new(@file)
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rescue StandardError
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nil
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end
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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 && @image_info.type.to_s != "svg"
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@upload.errors.add(:base, I18n.t("upload.images.size_not_found"))
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elsif max_image_pixels > 0 && pixels >= max_image_pixels
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@upload.errors.add(
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:base,
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I18n.t(
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"upload.images.larger_than_x_megapixels",
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max_image_megapixels: SiteSetting.max_image_megapixels,
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),
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)
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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 convert_png_to_jpeg?
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return false unless @image_info.type == :png
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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_favicon_to_png!
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png_tempfile = Tempfile.new(%w[image .png])
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from = @file.path
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to = png_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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from = "#{from}[-1]" # We only want the last(largest) image of the .ico file
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opts = { flatten: false } # Preserve transparency
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begin
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execute_convert(from, to, opts)
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rescue StandardError
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# retry with debugging enabled
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execute_convert(from, to, opts.merge(debug: true))
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end
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@file.respond_to?(:close!) ? @file.close! : @file.close
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@file = png_tempfile
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extract_image_info!
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end
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def convert_to_jpeg!
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return if @opts[:for_site_setting]
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return if filesize < MIN_CONVERT_TO_JPEG_BYTES_SAVED
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jpeg_tempfile = Tempfile.new(%w[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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opts = {}
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desired_quality = [
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SiteSetting.png_to_jpg_quality,
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SiteSetting.recompress_original_jpg_quality,
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].compact.min
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target_quality = @upload.target_image_quality(from, desired_quality)
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opts = { quality: target_quality } if target_quality
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begin
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execute_convert(from, to, opts)
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rescue StandardError
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# retry with debugging enabled
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execute_convert(from, to, opts.merge(debug: 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.respond_to?(:close!) ? @file.close! : @file.close
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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 convert_heif_to_jpeg?
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File.extname(@filename).downcase.match?(/\.hei(f|c)\z/)
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end
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def convert_heif!
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jpeg_tempfile = Tempfile.new(%w[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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begin
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execute_convert(from, to)
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rescue StandardError
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# retry with debugging enabled
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execute_convert(from, to, { debug: true })
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end
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@file.respond_to?(:close!) ? @file.close! : @file.close
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@file = jpeg_tempfile
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extract_image_info!
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end
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MAX_CONVERT_FORMAT_SECONDS = 20
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def execute_convert(from, to, opts = {})
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command = ["convert", from, "-auto-orient", "-background", "white", "-interlace", "none"]
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command << "-flatten" unless opts[:flatten] == false
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command << "-debug" << "all" if opts[:debug]
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command << "-quality" << opts[:quality].to_s if opts[:quality]
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command << to
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Discourse::Utils.execute_command(
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*command,
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failure_message: I18n.t("upload.png_to_jpg_conversion_failure_message"),
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timeout: MAX_CONVERT_FORMAT_SECONDS,
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)
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end
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def should_alter_quality?
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return false if animated?
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desired_quality =
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(
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if @image_info.type == :png
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SiteSetting.png_to_jpg_quality
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else
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SiteSetting.recompress_original_jpg_quality
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end
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)
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@upload.target_image_quality(@file.path, desired_quality).present?
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end
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def should_downsize?
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max_image_size > 0 && filesize >= max_image_size && !animated?
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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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down_tempfile = Tempfile.new(["down", ".#{@image_info.type}"])
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from = @file.path
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to = down_tempfile.path
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OptimizedImage.ensure_safe_paths!(from, to)
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OptimizedImage.downsize(from, to, "50%", scale_image: true, raise_on_error: true)
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@file.respond_to?(:close!) ? @file.close! : @file.close
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@file = down_tempfile
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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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rescue StandardError
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@upload.errors.add(:base, I18n.t("upload.optimize_failure_message"))
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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(
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:base,
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I18n.t(
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"upload.images.larger_than_x_megapixels",
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max_image_megapixels: SiteSetting.max_image_megapixels,
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),
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)
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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(
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:base,
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I18n.t(
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"upload.images.too_large_humanized",
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max_size: ActiveSupport::NumberHelper.number_to_human_size(max_image_size),
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),
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)
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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 clean_svg!
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doc = Nokogiri.XML(@file)
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doc.xpath(svg_allowlist_xpath).remove
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doc.xpath("//@*[starts-with(name(), 'on')]").remove
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doc
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.css("use")
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.each do |use_el|
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if use_el.attr("href")
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use_el.remove_attribute("href") unless use_el.attr("href").starts_with?("#")
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end
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use_el.remove_attribute("xlink:href")
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end
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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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MAX_FIX_ORIENTATION_TIME = 5
|
|
def fix_orientation!
|
|
path = @file.path
|
|
|
|
OptimizedImage.ensure_safe_paths!(path)
|
|
path = OptimizedImage.prepend_decoder!(path, nil, filename: "image.#{@image_info.type}")
|
|
|
|
Discourse::Utils.execute_command(
|
|
"convert",
|
|
path,
|
|
"-auto-orient",
|
|
path,
|
|
timeout: MAX_FIX_ORIENTATION_TIME,
|
|
)
|
|
|
|
extract_image_info!
|
|
end
|
|
|
|
def should_crop?
|
|
if %w[profile_background card_background custom_emoji].include?(@opts[:type]) && animated?
|
|
return false
|
|
end
|
|
|
|
TYPES_TO_CROP.include?(@opts[:type])
|
|
end
|
|
|
|
def crop!
|
|
max_pixel_ratio = Discourse::PIXEL_RATIOS.max
|
|
filename_with_correct_ext = "image.#{@image_info.type}"
|
|
|
|
case @opts[:type]
|
|
when "avatar"
|
|
width = height = Discourse.avatar_sizes.max
|
|
OptimizedImage.resize(
|
|
@file.path,
|
|
@file.path,
|
|
width,
|
|
height,
|
|
filename: filename_with_correct_ext,
|
|
)
|
|
when "profile_background"
|
|
max_width = 850 * max_pixel_ratio
|
|
width, height =
|
|
ImageSizer.resize(
|
|
@image_info.size[0],
|
|
@image_info.size[1],
|
|
max_width: max_width,
|
|
max_height: max_width,
|
|
)
|
|
OptimizedImage.downsize(
|
|
@file.path,
|
|
@file.path,
|
|
"#{width}x#{height}\>",
|
|
filename: filename_with_correct_ext,
|
|
)
|
|
when "card_background"
|
|
max_width = 590 * max_pixel_ratio
|
|
width, height =
|
|
ImageSizer.resize(
|
|
@image_info.size[0],
|
|
@image_info.size[1],
|
|
max_width: max_width,
|
|
max_height: max_width,
|
|
)
|
|
OptimizedImage.downsize(
|
|
@file.path,
|
|
@file.path,
|
|
"#{width}x#{height}\>",
|
|
filename: filename_with_correct_ext,
|
|
)
|
|
when "custom_emoji"
|
|
OptimizedImage.downsize(
|
|
@file.path,
|
|
@file.path,
|
|
"100x100\>",
|
|
filename: filename_with_correct_ext,
|
|
)
|
|
end
|
|
|
|
extract_image_info!
|
|
end
|
|
|
|
def should_optimize?
|
|
# GIF is too slow (plus, we'll soon be converting them to MP4)
|
|
# Optimizing SVG is useless
|
|
return false if @file.path =~ /\.(gif|svg)\z/i
|
|
# Safeguard for large PNGs
|
|
return pixels < 2_000_000 if @file.path =~ /\.png/i
|
|
# Everything else is fine!
|
|
true
|
|
end
|
|
|
|
def optimize!
|
|
OptimizedImage.ensure_safe_paths!(@file.path)
|
|
FileHelper.optimize_image!(@file.path)
|
|
extract_image_info!
|
|
end
|
|
|
|
def filesize
|
|
@filesize || File.size?(@file.path).to_i
|
|
end
|
|
|
|
def max_image_size
|
|
@max_image_size ||= SiteSetting.max_image_size_kb.kilobytes
|
|
end
|
|
|
|
def max_image_pixels
|
|
@max_image_pixels ||= SiteSetting.max_image_megapixels * 1_000_000
|
|
end
|
|
|
|
def pixels
|
|
@image_info.size&.reduce(:*).to_i
|
|
end
|
|
|
|
def svg_allowlist_xpath
|
|
@@svg_allowlist_xpath ||=
|
|
"//*[#{ALLOWED_SVG_ELEMENTS.map { |e| "name()!='#{e}'" }.join(" and ")}]"
|
|
end
|
|
|
|
def add_metadata!
|
|
@upload.for_private_message = true if @opts[:for_private_message]
|
|
@upload.for_group_message = true if @opts[:for_group_message]
|
|
@upload.for_theme = true if @opts[:for_theme]
|
|
@upload.for_export = true if @opts[:for_export]
|
|
@upload.for_site_setting = true if @opts[:for_site_setting]
|
|
@upload.for_gravatar = true if @opts[:for_gravatar]
|
|
end
|
|
|
|
private
|
|
|
|
def animated?
|
|
return @animated if @animated != nil
|
|
|
|
@animated ||=
|
|
begin
|
|
is_animated = FastImage.animated?(@file)
|
|
type = @image_info.type.to_s
|
|
|
|
if is_animated != nil
|
|
# FastImage will return nil if it cannot determine if animated
|
|
is_animated
|
|
elsif %w[gif webp avif].include?(type)
|
|
# Only GIFs, WEBPs and a few other unsupported image types can be animated
|
|
OptimizedImage.ensure_safe_paths!(@file.path)
|
|
|
|
command = ["identify", "-ping", "-format", "%n\\n", @file.path]
|
|
frames =
|
|
begin
|
|
Discourse::Utils.execute_command(*command, timeout: Upload::MAX_IDENTIFY_SECONDS).to_i
|
|
rescue StandardError
|
|
1
|
|
end
|
|
|
|
frames > 1
|
|
else
|
|
false
|
|
end
|
|
end
|
|
end
|
|
|
|
def generate_fake_sha1_hash
|
|
SecureRandom.hex(20)
|
|
end
|
|
end
|