478 lines
17 KiB
Ruby
478 lines
17 KiB
Ruby
# frozen_string_literal: true
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#
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# Copyright (C) 2011 - present Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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require 'zip'
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require 'tmpdir'
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require 'set'
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class ContentZipper
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def initialize(options={})
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@check_user = options.has_key?(:check_user) ? options[:check_user] : true
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@logger = Rails.logger
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end
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attr_writer :user
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# we evaluate some ERB templates from under app/views/ while generating assignment zips
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include I18nUtilities
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def t(*a, &b)
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I18n.t(*a, &b)
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end
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def self.process_attachment(*args)
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options = args.last.is_a?(Hash) ? args.pop : {}
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ContentZipper.new(options).process_attachment(*args)
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end
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def process_attachment(attachment, user = nil)
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raise "No attachment provided to ContentZipper.process_attachment" unless attachment
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attachment.update_attribute(:workflow_state, 'zipping')
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@user = user
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@logger.debug("file found: #{attachment.id} zipping files...")
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begin
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case attachment.context
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when Assignment then zip_assignment(attachment, attachment.context)
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when Eportfolio then zip_eportfolio(attachment, attachment.context)
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when Folder then zip_base_folder(attachment, attachment.context)
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when Quizzes::Quiz then zip_quiz(attachment, attachment.context)
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end
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rescue => e
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Canvas::Errors.capture(e, message: "Content zipping failed")
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attachment.update_attribute(:workflow_state, 'to_be_zipped')
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end
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end
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def assignment_zip_filename(assignment)
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"#{assignment.context.short_name_slug}-#{assignment.title_slug} submissions"
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end
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def zip_assignment(zip_attachment, assignment)
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mark_attachment_as_zipping!(zip_attachment)
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@assignment = assignment
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@context = assignment.context
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filename = assignment_zip_filename(assignment)
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user = zip_attachment.user
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# It is possible to get this far if an assignment allows the
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# downloadable submissions below as well as those that can't be
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# downloaded. In that case, only retrieve the ones that can be
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# downloaded.
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downloadable_submissions = ["online_upload", "online_url", "online_text_entry"]
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if @context.completed?
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submissions = assignment.submissions.where(submission_type: downloadable_submissions)
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# This neglects the complexity of group assignments
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students = User.where(id: submissions.pluck(:user_id)).index_by(&:id)
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else
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students = assignment.representatives(user: user).index_by(&:id)
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submissions = assignment.submissions.where(user_id: students.keys,
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submission_type: downloadable_submissions)
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end
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make_zip_tmpdir(filename) do |zip_name|
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@logger.debug("creating #{zip_name}")
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Zip::File.open(zip_name, Zip::File::CREATE) do |zipfile|
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count = submissions.length
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# prevents browser hangs when there are no submissions to download
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mark_successful! if count == 0
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submissions.each_with_index do |submission, index|
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add_submission(submission, students, zipfile)
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update_progress(zip_attachment, index, count)
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end
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end
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@logger.debug("added #{submissions.size} submissions")
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assignment.increment!(:submissions_downloads)
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complete_attachment!(zip_attachment, zip_name)
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end
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end
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class StaticAttachment
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attr_accessor :display_name, :filename, :unencoded_filename,
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:content_type, :uuid, :id, :attachment
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# Match on /files URLs capturing the object id.
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FILES_REGEX = %r{/files/(?<obj_id>\d+)/\w+(?:(?:[^\s"<'\?\/]*)([^\s"<']*))?}
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def initialize(attachment, index = nil)
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@attachment = attachment
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@display_name = @attachment.display_name
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@filename = index ? "#{index}_#{@attachment.filename}" : @attachment.filename
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@unencoded_filename = index ? "#{index}_#{@attachment.unencoded_filename}" : @attachment.unencoded_filename
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@content_type = @attachment.content_type
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@uuid = @attachment.uuid
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@id = @attachment.id
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end
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end
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def zip_eportfolio(zip_attachment, portfolio)
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static_attachments = []
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rich_text_attachments = []
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submissions = []
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portfolio_entries = portfolio.eportfolio_entries
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index = 1
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portfolio_entries.each do |entry|
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entry.readonly!
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index = rewrite_eportfolio_richtext_entry(index, rich_text_attachments, entry, zip_attachment.user)
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static_attachments += entry.attachments.select {|x| x.grants_right?(zip_attachment.user, :download)}
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submissions += entry.submissions
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end
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submissions_hash = {}
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submissions.each do |s|
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submissions_hash[s.id] = s
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if s.submission_type == 'online_upload'
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static_attachments += s.attachments
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else
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end
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end
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static_attachments = static_attachments.uniq.map do |a|
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obj = StaticAttachment.new(a, index)
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index += 1
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obj
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end
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all_attachments = rich_text_attachments + static_attachments
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filename = portfolio.name
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make_zip_tmpdir(filename) do |zip_name|
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index = 0
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count = all_attachments.length + 2
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Zip::File.open(zip_name, Zip::File::CREATE) do |zipfile|
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update_progress(zip_attachment, index, count)
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portfolio_entries.each do |entry|
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filename = "#{entry.full_slug}.html"
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content = render_eportfolio_page_content(entry, portfolio, all_attachments, submissions_hash)
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zipfile.get_output_stream(filename) {|f| f.puts content }
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end
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update_progress(zip_attachment, index, count)
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all_attachments.each do |a|
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add_attachment_to_zip(a.attachment, zipfile, a.unencoded_filename)
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update_progress(zip_attachment, index, count)
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end
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content = File.open(Rails.root.join('public', 'images', 'logo.png'), 'rb').read rescue nil
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zipfile.get_output_stream("logo.png") {|f| f.write content } if content
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end
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mark_successful!
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complete_attachment!(zip_attachment, zip_name)
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end
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end
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def render_eportfolio_page_content(page, portfolio, static_attachments, submissions_hash)
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@page = page
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@portfolio = @portfolio
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@static_attachments = static_attachments
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@submissions_hash = submissions_hash
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if CANVAS_RAILS5_2
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av = ActionView::Base.new()
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av.view_paths = ActionController::Base.view_paths
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else
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av = ActionView::Base.with_view_paths(ActionController::Base.view_paths)
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end
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av.extend TextHelper
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res = av.render(:partial => "eportfolios/static_page", :locals => {:page => page, :portfolio => portfolio, :static_attachments => static_attachments, :submissions_hash => submissions_hash})
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res
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end
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def self.zip_base_folder(*args)
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ContentZipper.new.zip_base_folder(*args)
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end
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def zip_base_folder(zip_attachment, folder)
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# this file count is admittedly an upper bound; not all files may be selected, and I don't want to count the ones
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# that are, but this will provide visible progress on large jobs, where it's most needed
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@zip_attachment = zip_attachment
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@file_count = folder.context.attachments.not_deleted.count
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@files_added = nil
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@logger.debug("zipping into attachment: #{zip_attachment.id}")
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zip_attachment.workflow_state = 'zipping' #!(:workflow_state => 'zipping')
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zip_attachment.save!
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filename = "#{folder.context.short_name}-#{folder.name} files"
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make_zip_tmpdir(filename) do |zip_name|
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@logger.debug("creating #{zip_name}")
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Zip::File.open(zip_name, Zip::File::CREATE) do |zipfile|
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@logger.debug("zip_name: #{zip_name}")
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process_folder(folder, zipfile)
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end
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mark_successful! unless @files_added == false
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complete_attachment!(zip_attachment, zip_name)
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end
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end
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def process_folder(folder, zipfile, start_dirs=[], opts={}, &callback)
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if callback
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zip_folder(folder, zipfile, start_dirs, opts, &callback)
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else
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zip_folder(folder, zipfile, start_dirs, opts)
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end
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end
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# make a tmp directory and yield a filename under that directory to the block
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# given. the tmp directory is deleted when the block returns.
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def make_zip_tmpdir(filename)
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filename = File.basename(filename.gsub(/ /, "_").gsub(/[^\w-]/, ""))
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Dir.mktmpdir do |dirname|
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zip_name = File.join(dirname, "#{filename}.zip")
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yield zip_name
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end
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end
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# The callback should accept two arguments, the attachment/folder and the folder names
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def zip_folder(folder, zipfile, folder_names, opts={}, &callback)
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if callback && (folder.hidden? || folder.locked)
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callback.call(folder, folder_names)
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end
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# @user = nil either means that
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# 1. this is part of a public course, and is being downloaded by somebody
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# not logged in - OR -
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# 2. we're doing this inside a course context export, and are bypassing
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# the user check (@check_user == false)
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attachments = if !@check_user || folder.context.grants_right?(@user, :manage_files)
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folder.active_file_attachments
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else
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folder.visible_file_attachments
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end
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attachments = attachments.select{|a| opts[:exporter].export_object?(a)} if opts[:exporter]
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attachments.select{|a| !@check_user || a.grants_right?(@user, :download)}.each do |attachment|
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callback.call(attachment, folder_names) if callback
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@context = folder.context
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@logger.debug(" found attachment: #{attachment.unencoded_filename}")
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path = folder_names.empty? ? attachment.display_name : File.join(folder_names, attachment.display_name)
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if add_attachment_to_zip(attachment, zipfile, path)
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@files_added ||= 0
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@files_added += 1
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update_progress(@zip_attachment, @files_added, @file_count) if @zip_attachment
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else
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@files_added = false if @files_added.nil?
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end
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end
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folder.active_sub_folders.select do |f|
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!@check_user || f.grants_right?(@user, :read_contents_for_export)
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end.each do |sub_folder|
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new_names = Array.new(folder_names) << sub_folder.name
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if callback
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zip_folder(sub_folder, zipfile, new_names, opts, &callback)
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else
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zip_folder(sub_folder, zipfile, new_names, opts)
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end
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end
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end
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def mark_attachment_as_zipping!(zip_attachment)
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zip_attachment.workflow_state = 'zipping'
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zip_attachment.save!
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end
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def zip_quiz(zip_attachment, quiz)
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Quizzes::QuizSubmissionZipper.new(
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quiz: quiz,
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zip_attachment: zip_attachment).zip!
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end
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def mark_successful!
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@zip_successful = true
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end
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def zipped_successfully?
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!!@zip_successful
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end
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def add_attachment_to_zip(attachment, zipfile, filename = nil)
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filename ||= attachment.filename
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# we allow duplicate filenames in the same folder. it's a bit silly, but we
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# have to handle it here or people might not get all their files zipped up.
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@files_in_zip ||= Set.new
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filename = Attachment.make_unique_filename(filename, @files_in_zip)
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@files_in_zip << filename
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handle = nil
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begin
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handle = attachment.open(:need_local_file => true)
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zipfile.get_output_stream(filename){|zos| Zip::IOExtras.copy_stream(zos, handle)}
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rescue => e
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@logger.error(" skipping #{attachment.full_filename} with error: #{e.message}")
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return false
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ensure
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handle.close if handle
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end
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true
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end
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def update_progress(zip_attachment, index, count)
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return unless count && count > 0
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zip_attachment.file_state = ((index + 1).to_f / count.to_f * 100).to_i
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return unless zip_attachment.file_state_changed?
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zip_attachment.save!
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@logger.debug("status for #{zip_attachment.id} updated to #{zip_attachment.file_state}")
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end
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def complete_attachment!(zip_attachment, zip_name)
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if zipped_successfully?
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@logger.debug("data zipped! uploading to external store...")
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uploaded_data = Rack::Test::UploadedFile.new(zip_name, 'application/zip')
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Attachments::Storage.store_for_attachment(zip_attachment, uploaded_data)
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zip_attachment.workflow_state = 'zipped'
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zip_attachment.file_state = 'available'
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else
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zip_attachment.workflow_state = 'errored'
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end
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zip_attachment.save!
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end
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private
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def rewrite_eportfolio_richtext_entry(index, attachments, entry, user)
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# In each rich_text section, find any referenced images, replace
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# the text with the image name, and add the image to the
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# attachments to be downloaded. If the rich_text attachment
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# can't be found, don't modify the the HTML, live with the
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# broken link, but have a mostly correct zip file.
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#
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# All other attachments toss on the static attachment pile for
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# later processing.
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if entry.content.is_a?(Array) && entry.content.present?
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entry.content.select { |c| c.is_a?(Hash) && c[:section_type] == "rich_text" }.each do |rt|
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rt[:content].gsub!(StaticAttachment::FILES_REGEX) do |match|
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att = Attachment.find_by(id: Regexp.last_match(:obj_id))
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if att.nil? || !att.grants_right?(user, :download)
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match
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else
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sa = StaticAttachment.new(att, index)
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attachments << sa
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index += 1
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sa.unencoded_filename
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end
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end
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end
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end
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index
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end
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def add_file(attachment, zipfile, fn)
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if attachment.deleted?
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mark_successful!
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elsif add_attachment_to_zip(attachment, zipfile, fn)
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mark_successful!
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end
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end
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def add_online_submission_content(filename, display_page, zipfile)
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extend(ApplicationHelper)
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content = File.open(File.join("app", "views", "assignments", display_page)).read
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content = ERB.new(content).result(binding)
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if content
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zipfile.get_output_stream(filename) {|f| f.puts content }
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mark_successful!
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end
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end
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def add_submission(submission, students, zipfile)
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@submission = submission
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@logger.debug(" checking submission for #{(submission.user.id)}")
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users_name = get_user_name(students, submission) unless @assignment.anonymize_students?
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filename = get_filename(users_name, submission)
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case submission.submission_type
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when "online_upload"
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add_upload_submission(submission, zipfile, filename)
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when "online_url"
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add_text_or_url(:url, zipfile, filename)
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when "online_text_entry"
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add_text_or_url(:text, zipfile, filename)
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end
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end
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def add_text_or_url(type, to_zip, called)
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if type == :text
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filename = "#{called}_text.html"
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display_page = "text_entry_page.html.erb"
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elsif type == :url
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filename = "#{called}_link.html"
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display_page = "redirect_page.html.erb"
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end
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add_online_submission_content(filename, display_page, to_zip)
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end
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def add_upload_submission(submission, zipfile, filename)
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uploaded_files = get_uploaded_files_from(submission)
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uploaded_files.each do |file|
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@logger.debug(" found attachment: #{file.display_name}")
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full_filename = "#{filename}_#{file.id}_#{sanitize_attachment_filename(file.display_name)}"
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add_file(file, zipfile, full_filename)
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end
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end
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def get_filename(users_name, submission)
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id = @assignment.anonymize_students? ? "anon_#{submission.anonymous_id}" : submission.user_id
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filename = [users_name, submission.late? ? 'LATE' : nil, id].compact.join('_')
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sanitize_file_name(filename)
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end
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def get_uploaded_files_from(submission)
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# NOTE: not using #versioned_attachments or #attachments because
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# they do not include submissions for group assignments for anyone
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# but the original submitter of the group submission
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attachment_ids = submission.attachment_ids.try(:split, ",")
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submission.shard.activate { Attachment.where(id: Array.wrap(attachment_ids)) }
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end
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def get_user_name(students, submission)
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# pulling out of this hash to get group names for group assignments
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# and to avoid extra queries
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user_name = students[submission.user_id].sortable_name
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sanitize_user_name(user_name)
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end
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def sanitize_file_name(filename)
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filename.gsub(/[^[[:word:]]]/, '')
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end
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def sanitize_attachment_filename(filename)
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filename.gsub(/[\x00\/\\:\*\?\"<>\|]+/, '_')
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end
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def sanitize_user_name(user_name)
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# necessary because we use /_\d+_/ to infer the user/attachment
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# ids when teachers upload graded submissions
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user_name.gsub!(/_(\d+)_/, '\1')
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user_name.gsub!(/^(\d+)$/, '\1')
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user_name.downcase
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end
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end
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