require 'net/ssh'
require 'pathname'
require 'fileutils'
namespace :create_site do
  desc "Install certbot"
  task :install_certbot,[:server_name] => :environment do |task,args|
    #Multithread.where(:key=>'detect_sites').destroy
    Multithread.where(:key=>'install_certbot').each{|thread| thread.destroy if (thread.status["status"] == "error" || thread.status["status"] == "finish")}
    Multithread.where(:key=>'install_certbot').destroy
    @thread = Multithread.where(:key=>'install_certbot').first
    @type = "exec_all"
    if @thread.nil?
      begin
        @thread = Multithread.create(:key=>'install_certbot',:status=>{"infos"=>[],"status"=>"running"})
        if( args.server_name.nil? rescue true)
            site_servers = SiteServer.all.where(:active=>true).to_a
        else
            site_servers = SiteServer.where(:server_name=>args.server_name).to_a
        end
        site_servers.each do |site_server|
          @site_server = site_server
          update_thread_infos("<span style='color: skyblue;'>"+@site_server.server_name+"</span>")
          @password = @site_server.password
          begin
            begin 
              Net::SSH.start(@site_server.ip , @site_server.account , password: @site_server.password) do |ssh|
              end
            rescue Net::SSH::HostKeyMismatch
              system("ssh-keygen -f \"$HOME/.ssh/known_hosts\" -R #{@site_server.ip}")
            rescue Errno::ENOTTY
              system("ssh-add \"$HOME/.ssh/id_rsa\"")
            rescue => e
              update_thread_infos(e.to_s)
              next
            end
            Net::SSH.start(@site_server.ip , @site_server.account , password: @site_server.password) do |ssh|
              certbot_path = exec_ssh_command_by_sudo_and_see_output(ssh,"bash -l -c 'which certbot'",false,true).strip
              snap_path = exec_ssh_command_by_sudo_and_see_output(ssh,"bash -l -c 'which snap'",false,true).strip
              already_apt_update = false
              if certbot_path.blank?
                update_thread_infos("checking kernel version")
                kernel_version = exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' uname -r",false,true).strip.to_f rescue 0.0
                update_thread_infos("kernel_version: #{kernel_version}")
                if kernel_version < 4.4
                  update_thread_infos("Downloading certbot by using python3(since kernel < 4.4)...")
                  exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' add-apt-repository ppa:deadsnakes/ppa -y",false)
                  update_thread_infos("execing apt update...")
                  exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' apt-get -y -o DPkg::options::='--force-confdef' -o DPkg::options::='--force-confold' update",true,false)
                  already_apt_update = true
                  update_thread_infos("Installing python3.6 python3.6-venv libaugeas0 ...")
                  exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' apt-get install python3.6 python3.6-venv libaugeas0 -y",false)
                  exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' rm -rf /opt/certbot/",false)
                  update_thread_infos("generating venv for certbot ...")
                  exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' python3.6 -m venv /opt/certbot/",false)
                  exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' /opt/certbot/bin/pip install --trusted-host pypi.python.org --upgrade pip",false)
                  update_thread_infos("Installing certbot on python3.6 ...")
                  exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' /opt/certbot/bin/pip install --trusted-host pypi.python.org certbot certbot-nginx",true)
                  exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' rm -f /usr/bin/certbot",true)
                  exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' ln -s /opt/certbot/bin/certbot /usr/bin/certbot",true)
                  update_thread_infos("Finish install certbot!")
                  certbot_path = "/usr/bin/certbot"
                else
                  if snap_path.blank?
                    unless already_apt_update
                      update_thread_infos("execing apt update...")
                      exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' apt-get -y -o DPkg::options::='--force-confdef' -o DPkg::options::='--force-confold' update",true,false)
                    end
                    update_thread_infos("Installing snap...")
                    exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' apt install snapd -y",true,false)
                    snap_path = exec_ssh_command_by_sudo_and_see_output(ssh,"bash -l -c 'which snap'",false,true).strip
                  end
                  if snap_path.present?
                    update_thread_infos("Installing snap core...")
                    exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' bash -l -c 'snap install core && snap refresh core'",true,false)
                    update_thread_infos("Installing certbot with snap...")
                    exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' snap install --classic certbot",true,false)
                    exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' ln -s /snap/bin/certbot /usr/bin/certbot",false,false)
                    exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' certbot register --email bohung@rulingcom.com --agree-tos -n",false,false)
                    update_thread_infos("Finish install certbot!")
                    certbot_path = "/usr/bin/certbot"
                  else
                    update_thread_infos("There was some error when installing snap!")
                  end
                end
              end
              if certbot_path.present?
                @site_server.has_certbot = true
                @site_server.save
                update_thread_infos("Setting certbot renew to cronjob...")
                crontab_lines = exec_ssh_command_by_sudo_and_see_output(ssh,"sudo -p 'sudo password:' crontab -l",false,false)
                certbot_renew_command = crontab_lines.select{|l| l.include?("certbot") && l.include?("renew")}[0]
                unless certbot_renew_command
                  update_thread_infos("Add certbot renew cronjob!")
                  certbot_renew_command = "30 2 * * 1 #{certbot_path} renew --no-self-upgrade --post-hook 'sudo service nginx restart' > /var/log/le-renew.log"
                  update_thread_infos(certbot_renew_command)
                  exec_ssh_command_by_sudo_and_see_output(ssh,"CRON=\"#{certbot_renew_command}\" && (sudo -p 'sudo password:' crontab -l; echo \"\$CRON\" ) | sudo -p 'sudo password:' crontab -",false)
                end
                update_thread_infos("Finish setting renew cronjob!")
              end
            end
          end
        end
        @thread.update(:status=>@thread.status.merge({"status"=>"finish"}))
      rescue => e
        puts [e,e.backtrace]
        @thread.update(:status=>{"infos"=>@thread.status["infos"].push(e.to_s),"status"=>"error"})
      end
    end
  end
end