mirror of
https://github.com/discourse/discourse.git
synced 2024-12-01 03:43:38 +08:00
347 lines
11 KiB
Ruby
347 lines
11 KiB
Ruby
require "digest/sha1"
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require_dependency "image_sizer"
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require_dependency "file_helper"
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require_dependency "url_helper"
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require_dependency "db_helper"
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require_dependency "validators/upload_validator"
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require_dependency "file_store/local_store"
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class Upload < ActiveRecord::Base
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belongs_to :user
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has_many :post_uploads, dependent: :destroy
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has_many :posts, through: :post_uploads
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has_many :optimized_images, dependent: :destroy
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attr_accessor :is_attachment_for_group_message
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validates_presence_of :filesize
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validates_presence_of :original_filename
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validates_with ::Validators::UploadValidator
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def thumbnail(width = self.width, height = self.height)
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optimized_images.find_by(width: width, height: height)
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end
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def has_thumbnail?(width, height)
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thumbnail(width, height).present?
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end
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def create_thumbnail!(width, height, crop=false)
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return unless SiteSetting.create_thumbnails?
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opts = {
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filename: self.original_filename,
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allow_animation: SiteSetting.allow_animated_thumbnails,
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crop: crop
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}
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if thumbnail = OptimizedImage.create_for(self, width, height, opts)
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self.width = width
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self.height = height
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save(validate: false)
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end
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end
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def destroy
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Upload.transaction do
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Discourse.store.remove_upload(self)
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super
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end
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end
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def extension
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File.extname(original_filename)
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end
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# list of image types that will be cropped
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CROPPED_IMAGE_TYPES ||= %w{
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avatar
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profile_background
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card_background
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custom_emoji
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}
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WHITELISTED_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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g
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line
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linearGradient
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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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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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}
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def self.generate_digest(path)
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Digest::SHA1.file(path).hexdigest
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end
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def self.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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# options
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# - content_type
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# - origin (url)
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# - image_type ("avatar", "profile_background", "card_background", "custom_emoji")
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# - is_attachment_for_group_message (boolean)
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def self.create_for(user_id, file, filename, filesize, options = {})
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upload = Upload.new
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DistributedMutex.synchronize("upload_#{user_id}_#{filename}") do
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# do some work on images
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if FileHelper.is_image?(filename) && is_actual_image?(file)
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# retrieve image info
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w, h = FastImage.size(file) || [0, 0]
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if filename[/\.svg$/i]
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# whitelist svg elements
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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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else
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if w * h >= SiteSetting.max_image_megapixels * 1_000_000
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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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return upload
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end
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# fix orientation first
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fix_image_orientation(file.path) if should_optimize?(file.path, [w, h])
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end
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# default size
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width, height = ImageSizer.resize(w, h)
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# make sure we're at the beginning of the file (both FastImage and Nokogiri move the pointer)
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file.rewind
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# crop images depending on their type
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if CROPPED_IMAGE_TYPES.include?(options[:image_type])
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allow_animation = SiteSetting.allow_animated_thumbnails
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max_pixel_ratio = Discourse::PIXEL_RATIOS.max
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case options[:image_type]
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when "avatar"
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allow_animation = SiteSetting.allow_animated_avatars
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width = height = Discourse.avatar_sizes.max
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OptimizedImage.resize(file.path, file.path, width, height, filename: filename, 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(w, h, max_width: max_width, max_height: max_width)
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OptimizedImage.downsize(file.path, file.path, "#{width}x#{height}", filename: filename, 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(w, h, max_width: max_width, max_height: max_width)
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OptimizedImage.downsize(file.path, file.path, "#{width}x#{height}", filename: filename, allow_animation: allow_animation)
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when "custom_emoji"
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OptimizedImage.downsize(file.path, file.path, "100x100", filename: filename, allow_animation: allow_animation)
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end
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end
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# optimize image (except GIFs, SVGs and large PNGs)
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if should_optimize?(file.path, [w, h])
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begin
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ImageOptim.new.optimize_image!(file.path)
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rescue ImageOptim::Worker::TimeoutExceeded
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# Don't optimize if it takes too long
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Rails.logger.warn("ImageOptim timed out while optimizing #{filename}")
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end
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# update the file size
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filesize = File.size(file.path)
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end
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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 = 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? || is_dimensionless_image?(filename, upload.width, upload.height))
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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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return upload unless upload.nil?
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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 = 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.width = width
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upload.height = height
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upload.origin = options[:origin][0...1000] if options[:origin]
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if options[:is_attachment_for_group_message]
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upload.is_attachment_for_group_message = true
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end
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if is_dimensionless_image?(filename, upload.width, upload.height)
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upload.errors.add(:base, I18n.t("upload.images.size_not_found"))
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return upload
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end
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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, options[:content_type])
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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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upload
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end
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end
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def self.is_actual_image?(file)
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# due to ImageMagick CVE-2016–3714, use FastImage to check the magic bytes
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# cf. https://meta.discourse.org/t/imagemagick-cve-2016-3714/43624
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FastImage.size(file, raise_on_failure: true)
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rescue
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false
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end
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LARGE_PNG_SIZE ||= 3.megabytes
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def self.should_optimize?(path, dimensions = nil)
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# don't optimize GIFs or SVGs
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return false if path =~ /\.(gif|svg)$/i
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return true if path !~ /\.png$/i
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dimensions ||= (FastImage.size(path) || [0, 0])
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w, h = dimensions
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# don't optimize large PNGs
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w > 0 && h > 0 && w * h < LARGE_PNG_SIZE
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end
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def self.is_dimensionless_image?(filename, width, height)
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FileHelper.is_image?(filename) && (width.blank? || width == 0 || height.blank? || height == 0)
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end
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def self.get_from_url(url)
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return if url.blank?
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# we store relative urls, so we need to remove any host/cdn
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url = url.sub(Discourse.asset_host, "") if Discourse.asset_host.present?
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# when using s3, we need to replace with the absolute base url
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url = url.sub(SiteSetting.s3_cdn_url, Discourse.store.absolute_base_url) if SiteSetting.s3_cdn_url.present?
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# always try to get the path
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uri = URI(url) rescue nil
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url = uri.path if uri.try(:scheme)
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Upload.find_by(url: url)
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end
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def self.fix_image_orientation(path)
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Discourse::Utils.execute_command('convert', path, '-auto-orient', path)
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end
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def self.migrate_to_new_scheme(limit=nil)
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problems = []
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if SiteSetting.migrate_to_new_scheme
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max_file_size_kb = [SiteSetting.max_image_size_kb, SiteSetting.max_attachment_size_kb].max.kilobytes
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local_store = FileStore::LocalStore.new
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scope = Upload.where("url NOT LIKE '%/original/_X/%'").order(id: :desc)
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scope.limit(limit) if limit
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scope.each do |upload|
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begin
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# keep track of the url
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previous_url = upload.url.dup
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# where is the file currently stored?
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external = previous_url =~ /^\/\//
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# download if external
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if external
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url = SiteSetting.scheme + ":" + previous_url
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file = FileHelper.download(url, max_file_size_kb, "discourse", true) rescue nil
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path = file.path
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else
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path = local_store.path_for(upload)
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end
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# compute SHA if missing
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if upload.sha1.blank?
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upload.sha1 = Upload.generate_digest(path)
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end
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# optimize if image
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if FileHelper.is_image?(File.basename(path))
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ImageOptim.new.optimize_image!(path)
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end
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# store to new location & update the filesize
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File.open(path) do |f|
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upload.url = Discourse.store.store_upload(f, upload)
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upload.filesize = f.size
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upload.save!
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end
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# remap the URLs
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DbHelper.remap(UrlHelper.absolute(previous_url), upload.url) unless external
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DbHelper.remap(previous_url, upload.url)
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# remove the old file (when local)
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unless external
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FileUtils.rm(path, force: true) rescue nil
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end
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rescue => e
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problems << { upload: upload, ex: e }
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ensure
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file.try(:unlink) rescue nil
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file.try(:close) rescue nil
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end
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end
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end
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problems
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end
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end
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# == Schema Information
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#
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# Table name: uploads
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#
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# id :integer not null, primary key
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# user_id :integer not null
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# original_filename :string not null
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# filesize :integer not null
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# width :integer
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# height :integer
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# url :string not null
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# created_at :datetime not null
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# updated_at :datetime not null
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# sha1 :string(40)
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# origin :string(1000)
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# retain_hours :integer
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#
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# Indexes
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#
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# index_uploads_on_id_and_url (id,url)
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# index_uploads_on_sha1 (sha1) UNIQUE
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# index_uploads_on_url (url)
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# index_uploads_on_user_id (user_id)
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#
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