# frozen_string_literal: true

require "net/imap"
require "test/unit"

class IMAPTest < Test::Unit::TestCase
  CA_FILE = File.expand_path("../fixtures/cacert.pem", __dir__)
  SERVER_KEY = File.expand_path("../fixtures/server.key", __dir__)
  SERVER_CERT = File.expand_path("../fixtures/server.crt", __dir__)

  def setup
    @do_not_reverse_lookup = Socket.do_not_reverse_lookup
    Socket.do_not_reverse_lookup = true
    @threads = []
  end

  def teardown
    if !@threads.empty?
      assert_join_threads(@threads)
    end
  ensure
    Socket.do_not_reverse_lookup = @do_not_reverse_lookup
  end

  def test_encode_utf7
    assert_equal("foo", Net::IMAP.encode_utf7("foo"))
    assert_equal("&-", Net::IMAP.encode_utf7("&"))

    utf8 = "\357\274\241\357\274\242\357\274\243".dup.force_encoding("UTF-8")
    s = Net::IMAP.encode_utf7(utf8)
    assert_equal("&,yH,Iv8j-", s)
    s = Net::IMAP.encode_utf7("foo&#{utf8}-bar".encode("EUC-JP"))
    assert_equal("foo&-&,yH,Iv8j--bar", s)

    utf8 = "\343\201\202&".dup.force_encoding("UTF-8")
    s = Net::IMAP.encode_utf7(utf8)
    assert_equal("&MEI-&-", s)
    s = Net::IMAP.encode_utf7(utf8.encode("EUC-JP"))
    assert_equal("&MEI-&-", s)
  end

  def test_decode_utf7
    assert_equal("&", Net::IMAP.decode_utf7("&-"))
    assert_equal("&-", Net::IMAP.decode_utf7("&--"))

    s = Net::IMAP.decode_utf7("&,yH,Iv8j-")
    utf8 = "\357\274\241\357\274\242\357\274\243".dup.force_encoding("UTF-8")
    assert_equal(utf8, s)
  end

  def test_format_date
    time = Time.mktime(2009, 7, 24)
    s = Net::IMAP.format_date(time)
    assert_equal("24-Jul-2009", s)
  end

  def test_format_datetime
    time = Time.mktime(2009, 7, 24, 1, 23, 45)
    s = Net::IMAP.format_datetime(time)
    assert_match(/\A24-Jul-2009 01:23 [+\-]\d{4}\z/, s)
  end

  if defined?(OpenSSL::SSL::SSLError)
    def test_imaps_unknown_ca
      assert_raise(OpenSSL::SSL::SSLError) do
        imaps_test do |port|
          begin
            Net::IMAP.new("localhost",
                          :port => port,
                          :ssl => true)
          rescue SystemCallError
            skip $!
          end
        end
      end
    end

    def test_imaps_with_ca_file
      assert_nothing_raised do
        imaps_test do |port|
          begin
            Net::IMAP.new("localhost",
                          :port => port,
                          :ssl => { :ca_file => CA_FILE })
          rescue SystemCallError
            skip $!
          end
        end
      end
    end

    def test_imaps_verify_none
      assert_nothing_raised do
        imaps_test do |port|
          Net::IMAP.new(server_addr,
                        :port => port,
                        :ssl => { :verify_mode => OpenSSL::SSL::VERIFY_NONE })
        end
      end
    end

    def test_imaps_post_connection_check
      assert_raise(OpenSSL::SSL::SSLError) do
        imaps_test do |port|
          # server_addr is different from the hostname in the certificate,
          # so the following code should raise a SSLError.
          Net::IMAP.new(server_addr,
                        :port => port,
                        :ssl => { :ca_file => CA_FILE })
        end
      end
    end
  end

  if defined?(OpenSSL::SSL)
    def test_starttls
      imap = nil
      starttls_test do |port|
        imap = Net::IMAP.new("localhost", :port => port)
        imap.starttls(:ca_file => CA_FILE)
        imap
      end
    rescue SystemCallError
      skip $!
    ensure
      if imap && !imap.disconnected?
        imap.disconnect
      end
    end
  end

  def start_server
    th = Thread.new do
      yield
    end
    @threads << th
    sleep 0.1 until th.stop?
  end

  def test_unexpected_eof
    server = create_tcp_server
    port = server.addr[1]
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        sock.gets
#       sock.print("* BYE terminating connection\r\n")
#       sock.print("RUBY0001 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end
    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      assert_raise(EOFError) do
        imap.logout
      end
    ensure
      imap.disconnect if imap
    end
  end

  def test_idle
    server = create_tcp_server
    port = server.addr[1]
    requests = []
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        requests.push(sock.gets)
        sock.print("+ idling\r\n")
        sock.print("* 3 EXISTS\r\n")
        sock.print("* 2 EXPUNGE\r\n")
        requests.push(sock.gets)
        sock.print("RUBY0001 OK IDLE terminated\r\n")
        sock.gets
        sock.print("* BYE terminating connection\r\n")
        sock.print("RUBY0002 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end

    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      responses = []
      imap.idle do |res|
        responses.push(res)
        if res.name == "EXPUNGE"
          imap.idle_done
        end
      end
      assert_equal(3, responses.length)
      assert_instance_of(Net::IMAP::ContinuationRequest, responses[0])
      assert_equal("EXISTS", responses[1].name)
      assert_equal(3, responses[1].data)
      assert_equal("EXPUNGE", responses[2].name)
      assert_equal(2, responses[2].data)
      assert_equal(2, requests.length)
      assert_equal("RUBY0001 IDLE\r\n", requests[0])
      assert_equal("DONE\r\n", requests[1])
      imap.logout
    ensure
      imap.disconnect if imap
    end
  end

  def test_exception_during_idle
    server = create_tcp_server
    port = server.addr[1]
    requests = []
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        requests.push(sock.gets)
        sock.print("+ idling\r\n")
        sock.print("* 3 EXISTS\r\n")
        sock.print("* 2 EXPUNGE\r\n")
        requests.push(sock.gets)
        sock.print("RUBY0001 OK IDLE terminated\r\n")
        sock.gets
        sock.print("* BYE terminating connection\r\n")
        sock.print("RUBY0002 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end
    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      begin
        th = Thread.current
        m = Monitor.new
        in_idle = false
        exception_raised = false
        c = m.new_cond
        raiser = Thread.start do
          m.synchronize do
            until in_idle
              c.wait(0.1)
            end
          end
          th.raise(Interrupt)
          m.synchronize do
            exception_raised = true
            c.signal
          end
        end
        @threads << raiser
        imap.idle do |res|
          m.synchronize do
            in_idle = true
            c.signal
            until exception_raised
              c.wait(0.1)
            end
          end
        end
      rescue Interrupt
      end
      assert_equal(2, requests.length)
      assert_equal("RUBY0001 IDLE\r\n", requests[0])
      assert_equal("DONE\r\n", requests[1])
      imap.logout
    ensure
      imap.disconnect if imap
      raiser.kill unless in_idle
    end
  end

  def test_idle_done_not_during_idle
    server = create_tcp_server
    port = server.addr[1]
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
      ensure
        sock.close
        server.close
      end
    end
    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      assert_raise(Net::IMAP::Error) do
        imap.idle_done
      end
    ensure
      imap.disconnect if imap
    end
  end

  def test_idle_timeout
    server = create_tcp_server
    port = server.addr[1]
    requests = []
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        requests.push(sock.gets)
        sock.print("+ idling\r\n")
        sock.print("* 3 EXISTS\r\n")
        sock.print("* 2 EXPUNGE\r\n")
        requests.push(sock.gets)
        sock.print("RUBY0001 OK IDLE terminated\r\n")
        sock.gets
        sock.print("* BYE terminating connection\r\n")
        sock.print("RUBY0002 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end

    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      responses = []
      Thread.pass
      imap.idle(0.2) do |res|
        responses.push(res)
      end
      # There is no guarantee that this thread has received all the responses,
      # so check the response length.
      if responses.length > 0
        assert_instance_of(Net::IMAP::ContinuationRequest, responses[0])
        if responses.length > 1
          assert_equal("EXISTS", responses[1].name)
          assert_equal(3, responses[1].data)
          if responses.length > 2
            assert_equal("EXPUNGE", responses[2].name)
            assert_equal(2, responses[2].data)
          end
        end
      end
      # Also, there is no guarantee that the server thread has stored
      # all the requests into the array, so check the length.
      if requests.length > 0
        assert_equal("RUBY0001 IDLE\r\n", requests[0])
        if requests.length > 1
          assert_equal("DONE\r\n", requests[1])
        end
      end
      imap.logout
    ensure
      imap.disconnect if imap
    end
  end

  def test_unexpected_bye
    server = create_tcp_server
    port = server.addr[1]
    start_server do
      sock = server.accept
      begin
        sock.print("* OK Gimap ready for requests from 75.101.246.151 33if2752585qyk.26\r\n")
        sock.gets
        sock.print("* BYE System Error 33if2752585qyk.26\r\n")
      ensure
        sock.close
        server.close
      end
    end
    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      assert_raise(Net::IMAP::ByeResponseError) do
        imap.login("user", "password")
      end
    end
  end

  def test_exception_during_shutdown
    server = create_tcp_server
    port = server.addr[1]
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        sock.gets
        sock.print("* BYE terminating connection\r\n")
        sock.print("RUBY0001 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end
    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      imap.instance_eval do
        def @sock.shutdown(*args)
          super
        ensure
          raise "error"
        end
      end
      imap.logout
    ensure
      assert_raise(RuntimeError) do
        imap.disconnect
      end
    end
  end

  def test_connection_closed_during_idle
    server = create_tcp_server
    port = server.addr[1]
    requests = []
    sock = nil
    threads = []
    started = false
    threads << Thread.start do
      started = true
      begin
        sock = server.accept
        sock.print("* OK test server\r\n")
        requests.push(sock.gets)
        sock.print("+ idling\r\n")
      rescue IOError # sock is closed by another thread
      ensure
        server.close
      end
    end
    sleep 0.1 until started
    threads << Thread.start do
      imap = Net::IMAP.new(server_addr, :port => port)
      begin
        m = Monitor.new
        in_idle = false
        closed = false
        c = m.new_cond
        threads << Thread.start do
          m.synchronize do
            until in_idle
              c.wait(0.1)
            end
          end
          sock.close
          m.synchronize do
            closed = true
            c.signal
          end
        end
        assert_raise(EOFError) do
          imap.idle do |res|
            m.synchronize do
              in_idle = true
              c.signal
              until closed
                c.wait(0.1)
              end
            end
          end
        end
        assert_equal(1, requests.length)
        assert_equal("RUBY0001 IDLE\r\n", requests[0])
      ensure
        imap.disconnect if imap
      end
    end
    assert_join_threads(threads)
  ensure
    if sock && !sock.closed?
      sock.close
    end
  end

  def test_connection_closed_without_greeting
    server = create_tcp_server
    port = server.addr[1]
    h = {'server before close': server.inspect} # inspect info before close
    start_server do
      begin
        sock = server.accept
        h[:sock_addr], h[:sock_peeraddr] = sock.addr, sock.peeraddr
        sock.close
      ensure
        server.close
      end
    end
    assert_raise(Net::IMAP::Error) do
      #begin
      Net::IMAP.new(server_addr, :port => port)
      #rescue Net::IMAP::Error
      #  raise Errno::EINVAL
      #end
    rescue Errno::EINVAL => e # for debug on OpenCSW
      h.merge!({e: e, server: server, port: port, server_addr: server_addr})
      raise(h.inspect)
    end
  end

  def test_default_port
    assert_equal(143, Net::IMAP.default_port)
    assert_equal(143, Net::IMAP.default_imap_port)
    assert_equal(993, Net::IMAP.default_tls_port)
    assert_equal(993, Net::IMAP.default_ssl_port)
    assert_equal(993, Net::IMAP.default_imaps_port)
  end

  def test_send_invalid_number
    server = create_tcp_server
    port = server.addr[1]
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        sock.gets
        sock.print("RUBY0001 OK TEST completed\r\n")
        sock.gets
        sock.print("RUBY0002 OK TEST completed\r\n")
        sock.gets
        sock.print("RUBY0003 OK TEST completed\r\n")
        sock.gets
        sock.print("RUBY0004 OK TEST completed\r\n")
        sock.gets
        sock.print("* BYE terminating connection\r\n")
        sock.print("RUBY0005 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end
    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      assert_raise(Net::IMAP::DataFormatError) do
        imap.send(:send_command, "TEST", -1)
      end
      imap.send(:send_command, "TEST", 0)
      imap.send(:send_command, "TEST", 4294967295)
      assert_raise(Net::IMAP::DataFormatError) do
        imap.send(:send_command, "TEST", 4294967296)
      end
      assert_raise(Net::IMAP::DataFormatError) do
        imap.send(:send_command, "TEST", Net::IMAP::MessageSet.new(-1))
      end
      assert_raise(Net::IMAP::DataFormatError) do
        imap.send(:send_command, "TEST", Net::IMAP::MessageSet.new(0))
      end
      imap.send(:send_command, "TEST", Net::IMAP::MessageSet.new(1))
      imap.send(:send_command, "TEST", Net::IMAP::MessageSet.new(4294967295))
      assert_raise(Net::IMAP::DataFormatError) do
        imap.send(:send_command, "TEST", Net::IMAP::MessageSet.new(4294967296))
      end
      imap.logout
    ensure
      imap.disconnect
    end
  end

  def test_send_literal
    server = create_tcp_server
    port = server.addr[1]
    requests = []
    literal = nil
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        line = sock.gets
        requests.push(line)
        size = line.slice(/{(\d+)}\r\n/, 1).to_i
        sock.print("+ Ready for literal data\r\n")
        literal = sock.read(size)
        requests.push(sock.gets)
        sock.print("RUBY0001 OK TEST completed\r\n")
        sock.gets
        sock.print("* BYE terminating connection\r\n")
        sock.print("RUBY0002 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end
    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      imap.send(:send_command, "TEST", ["\xDE\xAD\xBE\xEF".b])
      assert_equal(2, requests.length)
      assert_equal("RUBY0001 TEST ({4}\r\n", requests[0])
      assert_equal("\xDE\xAD\xBE\xEF".b, literal)
      assert_equal(")\r\n", requests[1])
      imap.logout
    ensure
      imap.disconnect
    end
  end

  def test_disconnect
    server = create_tcp_server
    port = server.addr[1]
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        sock.gets
        sock.print("* BYE terminating connection\r\n")
        sock.print("RUBY0001 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end
    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      imap.logout
      imap.disconnect
      assert_equal(true, imap.disconnected?)
      imap.disconnect
      assert_equal(true, imap.disconnected?)
    ensure
      imap.disconnect if imap && !imap.disconnected?
    end
  end

  def test_append
    server = create_tcp_server
    port = server.addr[1]
    mail = <<EOF.gsub(/\n/, "\r\n")
From: shugo@example.com
To: matz@example.com
Subject: hello

hello world
EOF
    requests = []
    received_mail = nil
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        line = sock.gets
        requests.push(line)
        size = line.slice(/{(\d+)}\r\n/, 1).to_i
        sock.print("+ Ready for literal data\r\n")
        received_mail = sock.read(size)
        sock.gets
        sock.print("RUBY0001 OK APPEND completed\r\n")
        requests.push(sock.gets)
        sock.print("* BYE terminating connection\r\n")
        sock.print("RUBY0002 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end

    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      imap.append("INBOX", mail)
      assert_equal(1, requests.length)
      assert_equal("RUBY0001 APPEND INBOX {#{mail.size}}\r\n", requests[0])
      assert_equal(mail, received_mail)
      imap.logout
      assert_equal(2, requests.length)
      assert_equal("RUBY0002 LOGOUT\r\n", requests[1])
    ensure
      imap.disconnect if imap
    end
  end

  def test_append_fail
    server = create_tcp_server
    port = server.addr[1]
    mail = <<EOF.gsub(/\n/, "\r\n")
From: shugo@example.com
To: matz@example.com
Subject: hello

hello world
EOF
    requests = []
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        requests.push(sock.gets)
        sock.print("RUBY0001 NO Mailbox doesn't exist\r\n")
        requests.push(sock.gets)
        sock.print("* BYE terminating connection\r\n")
        sock.print("RUBY0002 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end

    begin
      imap = Net::IMAP.new(server_addr, :port => port)
      assert_raise(Net::IMAP::NoResponseError) do
        imap.append("INBOX", mail)
      end
      assert_equal(1, requests.length)
      assert_equal("RUBY0001 APPEND INBOX {#{mail.size}}\r\n", requests[0])
      imap.logout
      assert_equal(2, requests.length)
      assert_equal("RUBY0002 LOGOUT\r\n", requests[1])
    ensure
      imap.disconnect if imap
    end
  end

  private

  def imaps_test
    server = create_tcp_server
    port = server.addr[1]
    ctx = OpenSSL::SSL::SSLContext.new
    ctx.ca_file = CA_FILE
    ctx.key = File.open(SERVER_KEY) { |f|
      OpenSSL::PKey::RSA.new(f)
    }
    ctx.cert = File.open(SERVER_CERT) { |f|
      OpenSSL::X509::Certificate.new(f)
    }
    ssl_server = OpenSSL::SSL::SSLServer.new(server, ctx)
    started = false
    ths = Thread.start do
      Thread.current.report_on_exception = false # always join-ed
      begin
        started = true
        sock = ssl_server.accept
        begin
          sock.print("* OK test server\r\n")
          sock.gets
          sock.print("* BYE terminating connection\r\n")
          sock.print("RUBY0001 OK LOGOUT completed\r\n")
        ensure
          sock.close
        end
      rescue Errno::EPIPE, Errno::ECONNRESET, Errno::ECONNABORTED
      end
    end
    sleep 0.1 until started
    begin
      begin
        imap = yield(port)
        imap.logout
      ensure
        imap.disconnect if imap
      end
    ensure
      ssl_server.close
      ths.join
    end
  end

  def starttls_test
    server = create_tcp_server
    port = server.addr[1]
    start_server do
      sock = server.accept
      begin
        sock.print("* OK test server\r\n")
        sock.gets
        sock.print("RUBY0001 OK completed\r\n")
        ctx = OpenSSL::SSL::SSLContext.new
        ctx.ca_file = CA_FILE
        ctx.key = File.open(SERVER_KEY) { |f|
          OpenSSL::PKey::RSA.new(f)
        }
        ctx.cert = File.open(SERVER_CERT) { |f|
          OpenSSL::X509::Certificate.new(f)
        }
        sock = OpenSSL::SSL::SSLSocket.new(sock, ctx)
        sock.sync_close = true
        sock.accept
        sock.gets
        sock.print("* BYE terminating connection\r\n")
        sock.print("RUBY0002 OK LOGOUT completed\r\n")
      ensure
        sock.close
        server.close
      end
    end
    begin
      imap = yield(port)
      imap.logout if !imap.disconnected?
    ensure
      imap.disconnect if imap && !imap.disconnected?
    end
  end

  def create_tcp_server
    return TCPServer.new(server_addr, 0)
  end

  def server_addr
    Addrinfo.tcp("localhost", 0).ip_address
  end
end