92 lines
3.4 KiB
Ruby
92 lines
3.4 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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# Attaches a file generally to another file, using the attachment_fu gateway.
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class FileInContext
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class << self
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def queue_files_to_delete(queue = true)
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@queue_files_to_delete = queue
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end
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def destroy_queued_files
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if @queued_files.present?
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Attachment.delay_if_production.destroy_files(@queued_files.map(&:id))
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@queued_files.clear
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end
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end
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def destroy_files(files)
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if @queue_files_to_delete
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@queued_files ||= []
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@queued_files += files
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else
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files.each(&:destroy)
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end
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end
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def attach(context, filename, display_name: nil, folder: nil, explicit_filename: nil, allow_rename: false, md5: nil, migration_id: nil)
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display_name ||= File.split(filename).last
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if md5 && folder && !allow_rename
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scope = context.attachments.where(display_name:, folder:).not_deleted
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scope = scope.where(migration_id: [migration_id, nil]) if migration_id # either find a previous copy or an unassociated match
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existing_att = false
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# only engage in hash comparison if there are possible duplicates
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if scope.take
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existing_att = scope.where(md5:).take
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# Hashing an alternative digest to check the possible duplicate that didn't match the previous hash
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# Keep in mind that the md5 argument isn't necessarily an actual md5 hash, it may be a sha512 (maybe even other stuff in the future)
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unless existing_att
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alternative_digest = (md5.length == 32) ? Digest::SHA2.new(512).file(filename) : Digest::MD5.file(filename)
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scope = scope.where(md5: alternative_digest.hexdigest)
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existing_att = scope.take
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end
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end
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if existing_att
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if migration_id && existing_att.migration_id.nil? # can set an existing unassociated attachment to the new migration_id
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existing_att.update_attribute(:migration_id, migration_id)
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end
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return existing_att
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elsif migration_id
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allow_rename = true # prevent overwriting if there's an existing matching filename that has a different migration_id
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end
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end
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uploaded_data = Canvas::UploadedFile.new(filename, Attachment.mimetype(explicit_filename || filename))
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@attachment = Attachment.new(context:, display_name:, folder:)
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Attachments::Storage.store_for_attachment(@attachment, uploaded_data)
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@attachment.filename = explicit_filename if explicit_filename
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@attachment.migration_id = migration_id
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@attachment.set_publish_state_for_usage_rights
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@attachment.save!
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destroy_files(@attachment.handle_duplicates(allow_rename ? :rename : :overwrite, caller_will_destroy: true))
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@attachment
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ensure
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uploaded_data&.close
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end
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end
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end
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