314 lines
10 KiB
Ruby
314 lines
10 KiB
Ruby
#coding=utf-8
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require "base64"
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require 'zip'
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class ZipdownController < ApplicationController
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#查找项目（课程）
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before_filter :find_project_by_bid_id, :only => [:assort]
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#检查权限
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#勿删 before_filter :authorize, :only => [:assort,:download_user_homework]
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SAVE_FOLDER = "#{Rails.root}/files"
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OUTPUT_FOLDER = "#{Rails.root}/files/archiveZip"
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MAX_PATH = 50
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#统一下载功能
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def download
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if User.current.logged?
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begin
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if params[:base64file]
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file = decode64(params[:base64file])
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send_file "#{OUTPUT_FOLDER}/#{file}", :filename => filename_for_content_disposition(file), :type => detect_content_type(file)
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else
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send_file "#{OUTPUT_FOLDER}/#{params[:file]}", :filename => filename_for_content_disposition(params[:filename]), :type => detect_content_type(params[:file])
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end
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rescue => e
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render file: 'public/no_file_found.html'
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end
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else
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render_403
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end
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end
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#一个作业下所有文件打包下载，只有admin和课程老师有权限
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def assort
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if params[:obj_class] == "Bid"
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bid = Bid.find params[:obj_id]
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render_403 if User.current.allowed_to?(:as_teacher,bid.courses.first)
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file_count = 0
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bid.homeworks.map { |homework| file_count += homework.attachments.count}
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if file_count > 0
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zipfile = zip_bid bid
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else
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zipfile = {:message => "no file"}
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end
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elsif params[:obj_class] == "HomeworkCommon"
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homework = HomeworkCommon.find params[:obj_id]
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render_403 if User.current.allowed_to?(:as_teacher,homework.course)
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file_count = 0
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homework.student_works.map { |work| file_count += work.attachments.count}
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if file_count > 0
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zipfile = zip_homework_common homework
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else
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zipfile = {:message => "no file"}
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end
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else
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logger.error "[ZipDown#assort] ===> #{params[:obj_class]} unKown !!"
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end
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respond_to do |format|
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format.json {
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render json: zipfile.to_json
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}
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end
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end
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#下载某一学生的作业的所有文件
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def download_user_homework
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homework = HomeworkAttach.find params[:homework]
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if User.current.admin? || User.current.member_of_course?(homework.bid.courses.first)
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if homework != nil
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unless homework.attachments.empty?
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zipfile = zip_homework_by_user homework
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filename = ((homework.user.user_extensions.nil? || homework.user.user_extensions.student_id.nil?) ? "" : homework.user.user_extensions.student_id) +
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"_" + homework.user.show_name +
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"_" + homework.name + ".zip"
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send_file zipfile.file_path, :filename => filename_for_content_disposition(filename), :type => detect_content_type(zipfile.file_path) if(zipfile)
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else
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render file: 'public/no_file_found.html'
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end
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else
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render file: 'public/file_not_found.html'
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end
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else
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render_403
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end
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#rescue => e
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# render file: 'public/file_not_found.html'
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end
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private
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#通过作业Id找到项目（课程）
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def find_project_by_bid_id
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obj_class = params[:obj_class]
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obj_id = params[:obj_id]
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obj = obj_class.constantize.find(obj_id)
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case obj.class.to_s.to_sym
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when :Bid
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@project = obj.courses[0]
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end
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end
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def zip_bid(bid)
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# Todo: User Access Controll
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bid_homework_path = []
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digests = []
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bid.homeworks.each do |homeattach|
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unless homeattach.attachments.empty?
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out_file = zip_homework_by_user(homeattach)
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bid_homework_path << out_file.file_path
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digests << out_file.file_digest
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end
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end
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homework_id = bid.id
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user_id = bid.author_id
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out_file = find_or_pack(homework_id, user_id, digests.sort){
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zipping("#{Time.now.to_i}_#{bid.name}.zip",
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bid_homework_path, OUTPUT_FOLDER)
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}
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[{files:[out_file.file_path], count: 1, index: 1,
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real_file: out_file.file_path,
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file: File.basename(out_file.file_path),
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base64file: encode64(File.basename(out_file.file_path)),
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size:(out_file.pack_size / 1024.0 / 1024.0).round(2)
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}]
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end
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def encode64(str)
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Base64.urlsafe_encode64(str)
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end
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def decode64(str)
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Base64.urlsafe_decode64(str)
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end
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def zip_homework_common homework_common
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bid_homework_path = []
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digests = []
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homework_common.student_works.each do |work|
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unless work.attachments.empty?
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out_file = zip_student_work_by_user(work)
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bid_homework_path << out_file.file_path
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digests << out_file.file_digest
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end
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end
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homework_id = homework_common.id
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user_id = homework_common.user_id
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out_file = find_or_pack(homework_id, user_id, digests.sort){
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zipping("#{Time.now.to_i}_#{homework_common.name}.zip",
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bid_homework_path, OUTPUT_FOLDER)
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}
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[{files:[out_file.file_path], count: 1, index: 1,
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real_file: out_file.file_path,
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file: File.basename(out_file.file_path),
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base64file: encode64(File.basename(out_file.file_path)),
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size:(out_file.pack_size / 1024.0 / 1024.0).round(2)
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}]
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end
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def zip_homework_by_user(homework_attach)
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homeworks_attach_path = []
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not_exist_file = []
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# 需要将所有homework.attachments遍历加入zip
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digests = []
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homework_attach.attachments.each do |attach|
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if File.exist?(attach.diskfile)
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homeworks_attach_path << attach.diskfile
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digests << attach.digest
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else
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not_exist_file << attach.filename
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digests << 'not_exist_file'
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end
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end
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out_file = find_or_pack(homework_attach.bid_id, homework_attach.user_id, digests.sort){
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zipping("#{homework_attach.user.show_name}_#{((homework_attach.user.user_extensions.nil? || homework_attach.user.user_extensions.student_id.nil?) ? "" : homework_attach.user.user_extensions.student_id)}_#{Time.now.to_i.to_s}.zip",
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homeworks_attach_path, OUTPUT_FOLDER, true, not_exist_file)
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}
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end
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def make_zip_name(work)
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"#{work.user.show_name}_#{((work.user.user_extensions.nil? || work.user.user_extensions.student_id.nil?) ? "" : work.user.user_extensions.student_id)}_#{Time.now.to_i.to_s}"
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end
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def zip_student_work_by_user(work)
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homeworks_attach_path = []
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not_exist_file = []
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# 需要将所有homework.attachments遍历加入zip
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digests = []
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work.attachments.each do |attach|
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if File.exist?(attach.diskfile)
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homeworks_attach_path << attach.diskfile
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digests << attach.digest
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else
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not_exist_file << attach.filename
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digests << 'not_exist_file'
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end
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end
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#单个文件的话,不需要压缩,只改名
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out_file = nil
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if homeworks_attach_path.size == 1
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out_file = find_or_pack(work.homework_common_id, work.user_id, digests.sort){
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des_path = "#{OUTPUT_FOLDER}/#{make_zip_name(work)}_#{File.basename(homeworks_attach_path.first)}"
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FileUtils.cp homeworks_attach_path.first, des_path
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des_path
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}
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else
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out_file = find_or_pack(work.homework_common_id, work.user_id, digests.sort){
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zipping("#{make_zip_name(work)}.zip",
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homeworks_attach_path, OUTPUT_FOLDER, true, not_exist_file)
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}
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end
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out_file
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end
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def find_or_pack(homework_id, user_id, digests)
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raise "please given a pack block" unless block_given?
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out_file = ZipPack.packed?(homework_id, user_id, digests.sort)
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unless out_file && out_file.file_valid?
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file = yield
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ZipPack.where(homework_id: homework_id,
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user_id: user_id).delete_all
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out_file = ZipPack.create(homework_id: homework_id,
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user_id: user_id,
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file_digest: Trustie::Utils.digest(file),
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file_path: file,
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pack_size: File.size(file),
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file_digests: digests.join(',')
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)
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else
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out_file.pack_times = out_file.pack_times + 1
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out_file.save
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end
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out_file
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end
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def zipping(zip_name_refer, files_paths, output_path, is_attachment=false, not_exist_file=[])
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rename_zipfile = zip_name_refer ||= "#{Time.now.to_i.to_s}.zip"
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# 文件名过长
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if rename_zipfile.size > MAX_PATH
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rename_zipfile = rename_zipfile[0,rename_zipfile.size-4][0,MAX_PATH-4] + rename_zipfile[-4,4]
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end
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zipfile_name = "#{output_path}/#{rename_zipfile}"
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Dir.mkdir(File.dirname(zipfile_name)) unless File.exist?(File.dirname(zipfile_name))
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Zip::File.open(zipfile_name, Zip::File::CREATE) do |zipfile|
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files_paths.each do |filename|
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rename_file = File.basename(filename)
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rename_file = filename_to_real( File.basename(filename)) if is_attachment
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begin
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zipfile.add(rename_file, filename)
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rescue Exception => e
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zipfile.get_output_stream('FILE_NOTICE.txt'){|os| os.write l(:label_file_exist)}
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next
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end
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end
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unless not_exist_file.empty?
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zipfile.get_output_stream('FILE_LOST.txt'){|os| os.write l(:label_file_lost) + not_exist_file.join(',').to_s}
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end
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end
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zipfile_name
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end
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# 合理分配文件打包
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# 如果小于 pack_attachment_max_size, 则返回单个文件
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# 反之则切分为多个文件组返回
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def split_pack_files(files, pack_attachment_max_size)
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max_size = 0
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last_files = []
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ret_files = []
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files.each_with_index do |f,i|
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if (max_size += File.size(f)) > pack_attachment_max_size
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max_size = 0
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if last_files.empty? #如果单个文件超过大小，也将此文件作为一组
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ret_files << {files: [f], count: 1, index: ret_files.count+1}
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last_files.clear
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else
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ret_files << {files:last_files, count: last_files.count, index: ret_files.count+1}
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last_files.clear
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redo
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end
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else
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last_files << f
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end
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end
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ret_files << {files:last_files, count: last_files.count, index: ret_files.count+1} unless last_files.empty?
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ret_files
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end
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def detect_content_type(name)
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content_type = Redmine::MimeType.of(name)
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content_type.to_s
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end
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def filename_to_real(name)
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attach = Attachment.find_by_disk_filename(name)
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attach.filename
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end
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end
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