# $Id$
# 
# Copyright (C) 2013--2014  Dragon Research Labs ("DRL")
# Portions copyright (C) 2009--2012  Internet Systems Consortium ("ISC")
# Portions copyright (C) 2007--2008  American Registry for Internet Numbers ("ARIN")
# 
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notices and this permission notice appear in all copies.
# 
# THE SOFTWARE IS PROVIDED "AS IS" AND DRL, ISC, AND ARIN DISCLAIM ALL
# WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL DRL,
# ISC, OR ARIN BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

"""
IR database daemon.

This is the old (pre-Django) version of irdbd, still used by smoketest
and perhaps still useful as a minimal example.  This does NOT work with
the GUI, rpkic, or any of the other more recent tools.
"""

import sys
import os
import time
import argparse
import urlparse
import rpki.http
import rpki.config
import rpki.resource_set
import rpki.relaxng
import rpki.exceptions
import rpki.left_right
import rpki.log
import rpki.x509

from rpki.mysql_import import MySQLdb

class main(object):


  def handle_list_resources(self, q_pdu, r_msg):

    r_pdu = rpki.left_right.list_resources_elt()
    r_pdu.tag = q_pdu.tag
    r_pdu.self_handle = q_pdu.self_handle
    r_pdu.child_handle = q_pdu.child_handle

    self.cur.execute(
      "SELECT registrant_id, valid_until FROM registrant WHERE registry_handle = %s AND registrant_handle = %s",
      (q_pdu.self_handle, q_pdu.child_handle))

    if self.cur.rowcount != 1:
      raise rpki.exceptions.NotInDatabase, \
            "This query should have produced a single exact match, something's messed up (rowcount = %d, self_handle = %s, child_handle = %s)" \
            % (self.cur.rowcount, q_pdu.self_handle, q_pdu.child_handle)

    registrant_id, valid_until = self.cur.fetchone()

    r_pdu.valid_until = valid_until.strftime("%Y-%m-%dT%H:%M:%SZ")

    r_pdu.asn  = rpki.resource_set.resource_set_as.from_sql(
      self.cur,
      "SELECT start_as, end_as FROM registrant_asn WHERE registrant_id = %s",
      (registrant_id,))

    r_pdu.ipv4 = rpki.resource_set.resource_set_ipv4.from_sql(
      self.cur,
      "SELECT start_ip, end_ip FROM registrant_net WHERE registrant_id = %s AND version = 4",
      (registrant_id,))

    r_pdu.ipv6 = rpki.resource_set.resource_set_ipv6.from_sql(
      self.cur,
      "SELECT start_ip, end_ip FROM registrant_net WHERE registrant_id = %s AND version = 6",
      (registrant_id,))

    r_msg.append(r_pdu)


  def handle_list_roa_requests(self, q_pdu, r_msg):

    self.cur.execute(
      "SELECT roa_request_id, asn FROM roa_request WHERE roa_request_handle = %s",
      (q_pdu.self_handle,))

    for roa_request_id, asn in self.cur.fetchall():

      r_pdu = rpki.left_right.list_roa_requests_elt()
      r_pdu.tag = q_pdu.tag
      r_pdu.self_handle = q_pdu.self_handle
      r_pdu.asn = asn

      r_pdu.ipv4 = rpki.resource_set.roa_prefix_set_ipv4.from_sql(
        self.cur,
        "SELECT prefix, prefixlen, max_prefixlen FROM roa_request_prefix WHERE roa_request_id = %s AND version = 4",
        (roa_request_id,))

      r_pdu.ipv6 = rpki.resource_set.roa_prefix_set_ipv6.from_sql(
        self.cur,
        "SELECT prefix, prefixlen, max_prefixlen FROM roa_request_prefix WHERE roa_request_id = %s AND version = 6",
        (roa_request_id,))

      r_msg.append(r_pdu)


  def handle_list_ghostbuster_requests(self, q_pdu, r_msg):

    self.cur.execute(
      "SELECT vcard  FROM ghostbuster_request WHERE self_handle = %s AND parent_handle = %s",
      (q_pdu.self_handle, q_pdu.parent_handle))

    vcards = [result[0] for result in self.cur.fetchall()]

    if not vcards:

      self.cur.execute(
        "SELECT vcard  FROM ghostbuster_request WHERE self_handle = %s AND parent_handle IS NULL",
        (q_pdu.self_handle,))

      vcards = [result[0] for result in self.cur.fetchall()]

    for vcard in vcards:
      r_pdu = rpki.left_right.list_ghostbuster_requests_elt()
      r_pdu.tag = q_pdu.tag
      r_pdu.self_handle = q_pdu.self_handle
      r_pdu.parent_handle = q_pdu.parent_handle
      r_pdu.vcard = vcard
      r_msg.append(r_pdu)


  def handle_list_ee_certificate_requests(self, q_pdu, r_msg):
    rpki.log.note("old_irdbd doesn't currently implement <list_ee_certificate_requests/>, ignoring")

    
  handle_dispatch = {
    rpki.left_right.list_resources_elt               : handle_list_resources,
    rpki.left_right.list_roa_requests_elt            : handle_list_roa_requests,
    rpki.left_right.list_ghostbuster_requests_elt    : handle_list_ghostbuster_requests,
    rpki.left_right.list_ee_certificate_requests_elt : handle_list_ee_certificate_requests }

  def handler(self, query, path, cb):
    try:

      self.db.ping(True)

      r_msg = rpki.left_right.msg.reply()

      try:

        q_msg = rpki.left_right.cms_msg(DER = query).unwrap((self.bpki_ta, self.rpkid_cert))

        if not isinstance(q_msg, rpki.left_right.msg) or not q_msg.is_query():
          raise rpki.exceptions.BadQuery, "Unexpected %r PDU" % q_msg

        for q_pdu in q_msg:

          try:

            try:
              h = self.handle_dispatch[type(q_pdu)]
            except KeyError:
              raise rpki.exceptions.BadQuery, "Unexpected %r PDU" % q_pdu
            else:
              h(self, q_pdu, r_msg)

          except (rpki.async.ExitNow, SystemExit):
            raise

          except Exception, e:
            rpki.log.traceback()
            r_msg.append(rpki.left_right.report_error_elt.from_exception(e, q_pdu.self_handle, q_pdu.tag))

      except (rpki.async.ExitNow, SystemExit):
        raise

      except Exception, e:
        rpki.log.traceback()
        r_msg.append(rpki.left_right.report_error_elt.from_exception(e))

      cb(200, body = rpki.left_right.cms_msg().wrap(r_msg, self.irdbd_key, self.irdbd_cert))

    except (rpki.async.ExitNow, SystemExit):
      raise

    except Exception, e:
      rpki.log.traceback()

      # We only get here in cases where we couldn't or wouldn't generate
      # <report_error/>, so just return HTTP failure.

      cb(500, reason = "Unhandled exception %s: %s" % (e.__class__.__name__, e))


  def __init__(self):

    os.environ["TZ"] = "UTC"
    time.tzset()

    parser = argparse.ArgumentParser(description = __doc__)
    parser.add_argument("-c", "--config",
                        help = "override default location of configuration file")
    parser.add_argument("-d", "--debug", action = "store_true",
                        help = "enable debugging mode")
    args = parser.parse_args()

    rpki.log.init("irdbd", use_syslog = not args.debug)

    self.cfg = rpki.config.parser(args.config, "irdbd")

    startup_msg = self.cfg.get("startup-message", "")
    if startup_msg:
      rpki.log.info(startup_msg)

    self.cfg.set_global_flags()

    self.db = MySQLdb.connect(user   = self.cfg.get("sql-username"),
                              db     = self.cfg.get("sql-database"),
                              passwd = self.cfg.get("sql-password"))

    self.cur = self.db.cursor()
    self.db.autocommit(True)

    self.bpki_ta         = rpki.x509.X509(Auto_update = self.cfg.get("bpki-ta"))
    self.rpkid_cert      = rpki.x509.X509(Auto_update = self.cfg.get("rpkid-cert"))
    self.irdbd_cert      = rpki.x509.X509(Auto_update = self.cfg.get("irdbd-cert"))
    self.irdbd_key       = rpki.x509.RSA( Auto_update = self.cfg.get("irdbd-key"))

    u = urlparse.urlparse(self.cfg.get("http-url"))

    assert u.scheme in ("", "http") and \
           u.username is None and \
           u.password is None and \
           u.params   == "" and \
           u.query    == "" and \
           u.fragment == ""

    rpki.http.server(host         = u.hostname or "localhost",
                     port         = u.port or 443,
                     handlers     = ((u.path, self.handler),))