#
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is mozilla.org code.
#
# The Initial Developer of the Original Code is
# Mozilla Foundation.
# Portions created by the Initial Developer are Copyright (C) 2008
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Robert Sayre <sayrer@gmail.com>
#   Jeff Walden <jwalden+bmo@mit.edu>
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****

import codecs
from datetime import datetime
import itertools
import logging
import shutil
import os
import re
import signal
import sys
import threading

"""
Runs the browser from a script, and provides useful utilities
for setting up the browser environment.
"""

SCRIPT_DIR = os.path.abspath(os.path.realpath(os.path.dirname(sys.argv[0])))

__all__ = [
           "UNIXISH",
           "IS_WIN32",
           "IS_MAC",
           "runApp",
           "Process",
           "initializeProfile",
           "DIST_BIN",
           "DEFAULT_APP",
           "environment",
          ]

# These are generated in mozilla/build/Makefile.in
#expand DIST_BIN = "./" + __XPC_BIN_PATH__
#expand IS_WIN32 = len("__WIN32__") != 0
#expand IS_MAC = __IS_MAC__ != 0
#ifdef IS_CYGWIN
#expand IS_CYGWIN = __IS_CYGWIN__ == 1
#else
IS_CYGWIN = False
#endif
#expand IS_CAMINO = __IS_CAMINO__ != 0
#expand BIN_SUFFIX = __BIN_SUFFIX__

UNIXISH = not IS_WIN32 and not IS_MAC

#expand DEFAULT_APP = "./" + __BROWSER_PATH__
#expand CERTS_DIR = __CERTS_DIR__
#expand IS_TEST_BUILD = __IS_TEST_BUILD__

###########
# LOGGING #
###########

# We use the logging system here primarily because it'll handle multiple
# threads, which is needed to process the output of the server and application
# processes simultaneously.
log = logging.getLogger()
handler = logging.StreamHandler(sys.stdout)
log.setLevel(logging.INFO)
log.addHandler(handler)


#################
# SUBPROCESSING #
#################

class Process:
  """
  Represents a subprocess of this process.  We don't just directly use the
  subprocess module here because we want compatibility with Python 2.3 on
  non-Windows platforms.  :-(
  """

  def __init__(self, command, args, env, inputdata = None):
    """
    Creates a process representing the execution of the given command, which
    must be an absolute path, with the given arguments in the given environment.
    The process is then started.
    """
    command = os.path.abspath(command)
    if IS_WIN32:
      import tempfile
      import subprocess
      
      if inputdata:
        inputfile = tempfile.TemporaryFile()
        inputfile.write(inputdata)
        inputfile.seek(0)
      else:
        inputfile = None
        
      cmd = [command]
      cmd.extend(args)
      p = subprocess.Popen(cmd, env = env,
                           stdout = subprocess.PIPE,
                           stderr = subprocess.STDOUT,
                           stdin = inputfile)
      self._out = p.stdout
    else:
      import popen2
      cmd = []
      if env:
        for (k, v) in env.iteritems():
          cmd.append(k + "='" + v + "' ")
          
      cmd.append("'" + command + "'")
      cmd.extend(map(lambda x: "'" + x + "'", args))
      cmd = " ".join(cmd)
      p = popen2.Popen4(cmd)
      self._out = p.fromchild

      if inputdata:
        p.tochild.write(inputdata)
        p.tochild.close()

    self._process = p
    self.pid = p.pid
    
    self._thread = threading.Thread(target = lambda: self._run())
    self._thread.start()

  def _run(self):
    "Continues execution of this process on a separate thread."
    p = self._process
    out = self._out

    if IS_WIN32:
      running = lambda: p.poll() is None
    else:
      running = lambda: p.poll() == -1

    # read in lines until the process finishes, then read in any last remaining
    # buffered lines
    while running():
      line = out.readline().rstrip()
      if len(line) > 0:
        log.info(line)
    for line in out:
      line = line.rstrip()
      if len(line) > 0:
        log.info(line)
    self._status = p.poll()

  def wait(self):
    "Waits for this process to finish, then returns the process's status."
    self._thread.join()
    return self._status

  def kill(self):
    "Kills this process."
    try:
      if not IS_WIN32:
        os.kill(self._process.pid, signal.SIGKILL)
      else:
        import subprocess
        pid = "%i" % self.pid
        process = subprocess.Popen(["taskkill", "/F", "/PID", pid])
        process.wait()
    except:
      pass


#################
# PROFILE SETUP #
#################

class SyntaxError(Exception):
  "Signifies a syntax error on a particular line in server-locations.txt."

  def __init__(self, lineno, msg = None):
    self.lineno = lineno
    self.msg = msg

  def __str__(self):
    s = "Syntax error on line " + str(self.lineno)
    if self.msg:
      s += ": %s." % self.msg
    else:
      s += "."
    return s


class Location:
  "Represents a location line in server-locations.txt."

  def __init__(self, scheme, host, port, options):
    self.scheme = scheme
    self.host = host
    self.port = port
    self.options = options


def readLocations(locationsPath = "server-locations.txt"):
  """
  Reads the locations at which the Mochitest HTTP server is available from
  server-locations.txt.
  """

  locationFile = codecs.open(locationsPath, "r", "UTF-8")

  # Perhaps more detail than necessary, but it's the easiest way to make sure
  # we get exactly the format we want.  See server-locations.txt for the exact
  # format guaranteed here.
  lineRe = re.compile(r"^(?P<scheme>[a-z][-a-z0-9+.]*)"
                      r"://"
                      r"(?P<host>"
                        r"\d+\.\d+\.\d+\.\d+"
                        r"|"
                        r"(?:[a-z0-9](?:[-a-z0-9]*[a-z0-9])?\.)*"
                        r"[a-z](?:[-a-z0-9]*[a-z0-9])?"
                      r")"
                      r":"
                      r"(?P<port>\d+)"
                      r"(?:"
                      r"\s+"
                      r"(?P<options>\S+(?:,\S+)*)"
                      r")?$")
  locations = []
  lineno = 0
  seenPrimary = False
  for line in locationFile:
    lineno += 1
    if line.startswith("#") or line == "\n":
      continue
      
    match = lineRe.match(line)
    if not match:
      raise SyntaxError(lineno)

    options = match.group("options")
    if options:
      options = options.split(",")
      if "primary" in options:
        if seenPrimary:
          raise SyntaxError(lineno, "multiple primary locations")
        seenPrimary = True
    else:
      options = []

    locations.append(Location(match.group("scheme"), match.group("host"),
                              match.group("port"), options))

  if not seenPrimary:
    raise SyntaxError(lineno + 1, "missing primary location")

  return locations


def initializeProfile(profileDir):
  "Sets up the standard testing profile."

  # Start with a clean slate.
  shutil.rmtree(profileDir, True)
  os.mkdir(profileDir)

  prefs = []

  part = """\
user_pref("browser.dom.window.dump.enabled", true);
user_pref("dom.allow_scripts_to_close_windows", true);
user_pref("dom.disable_open_during_load", false);
user_pref("dom.max_script_run_time", 0); // no slow script dialogs
user_pref("signed.applets.codebase_principal_support", true);
user_pref("security.warn_submit_insecure", false);
user_pref("browser.shell.checkDefaultBrowser", false);
user_pref("shell.checkDefaultClient", false);
user_pref("browser.warnOnQuit", false);
user_pref("accessibility.typeaheadfind.autostart", false);
user_pref("javascript.options.showInConsole", true);
user_pref("layout.debug.enable_data_xbl", true);
user_pref("browser.EULA.override", true);
user_pref("javascript.options.jit.content", true);
user_pref("gfx.color_management.force_srgb", true);

user_pref("camino.warn_when_closing", false); // Camino-only, harmless to others
"""
  prefs.append(part)

  locations = readLocations()

  # Grant God-power to all the privileged servers on which tests run.
  privileged = filter(lambda loc: "privileged" in loc.options, locations)
  for (i, l) in itertools.izip(itertools.count(1), privileged):
    part = """
user_pref("capability.principal.codebase.p%(i)d.granted",
          "UniversalXPConnect UniversalBrowserRead UniversalBrowserWrite \
           UniversalPreferencesRead UniversalPreferencesWrite \
           UniversalFileRead");
user_pref("capability.principal.codebase.p%(i)d.id", "%(origin)s");
user_pref("capability.principal.codebase.p%(i)d.subjectName", "");
"""  % { "i": i,
         "origin": (l.scheme + "://" + l.host + ":" + l.port) }
    prefs.append(part)

  # We need to proxy every server but the primary one.
  origins = ["'%s://%s:%s'" % (l.scheme, l.host, l.port)
             for l in filter(lambda l: "primary" not in l.options, locations)]
  origins = ", ".join(origins)

  pacURL = """data:text/plain,
function FindProxyForURL(url, host)
{
  var origins = [%(origins)s];
  var regex = new RegExp('^([a-z][-a-z0-9+.]*)' +
                         '://' +
                         '(?:[^/@]*@)?' +
                         '(.*?)' +
                         '(?::(\\\\\\\\d+))?/');
  var matches = regex.exec(url);
  if (!matches)
    return 'DIRECT';
  var isHttp = matches[1] == 'http';
  var isHttps = matches[1] == 'https';
  if (!matches[3])
  {
    if (isHttp) matches[3] = '80';
    if (isHttps) matches[3] = '443';
  }
    
  var origin = matches[1] + '://' + matches[2] + ':' + matches[3];
  if (origins.indexOf(origin) < 0)
    return 'DIRECT';
  if (isHttp)
    return 'PROXY 127.0.0.1:8888';
  if (isHttps)
    return 'PROXY 127.0.0.1:4443';
  return 'DIRECT';
}""" % { "origins": origins }
  pacURL = "".join(pacURL.splitlines())

  part = """
user_pref("network.proxy.type", 2);
user_pref("network.proxy.autoconfig_url", "%(pacURL)s");

user_pref("camino.use_system_proxy_settings", false); // Camino-only, harmless to others
""" % {"pacURL": pacURL}
  prefs.append(part)

  # write the preferences
  prefsFile = open(profileDir + "/" + "user.js", "a")
  prefsFile.write("".join(prefs))
  prefsFile.close()

def fillCertificateDB(profileDir):

  pwfilePath = os.path.join(profileDir, ".crtdbpw")
  
  pwfile = open(pwfilePath, "w")
  pwfile.write("\n")
  pwfile.close()

  # Create head of the ssltunnel configuration file
  sslTunnelConfigPath = os.path.join(CERTS_DIR, "ssltunnel.cfg")
  sslTunnelConfig = open(sslTunnelConfigPath, "w")
  
  sslTunnelConfig.write("httpproxy:1\n")
  sslTunnelConfig.write("certdbdir:%s\n" % CERTS_DIR)
  sslTunnelConfig.write("forward:127.0.0.1:8888\n")
  sslTunnelConfig.write("listen:*:4443:pgo server certificate\n")

  # Generate automatic certificate and bond custom certificates
  locations = readLocations()
  locations.pop(0)
  for loc in locations:
    if loc.scheme == "https" and "nocert" not in loc.options:
      customCertRE = re.compile("^cert=(?P<nickname>[0-9a-zA-Z_ ]+)")
      for option in loc.options:
        match = customCertRE.match(option)
        if match:
          customcert = match.group("nickname");
          sslTunnelConfig.write("listen:%s:%s:4443:%s\n" % (loc.host, loc.port, customcert))
          break

  sslTunnelConfig.close()

  # Pre-create the certification database for the profile
  certutil = DIST_BIN + "/certutil" + BIN_SUFFIX
  status = Process(certutil, ["-N", "-d", profileDir, "-f", pwfilePath], environment()).wait()
  if status != 0:
    return status

  # Walk the cert directory and add custom CAs as trusted
  files = os.listdir(CERTS_DIR)
  for item in files:
    root, ext = os.path.splitext(item)
    if ext == ".ca":
      Process(certutil, ["-A", "-i", os.path.join(CERTS_DIR, item), "-d", profileDir, "-f", pwfilePath, "-n", root, "-t", "CT,,"], environment())

  os.unlink(pwfilePath)
  return 0

def environment(env = None):
  if env == None:
    env = dict(os.environ)

  if UNIXISH:
    ldLibraryPath = os.path.join(SCRIPT_DIR, DIST_BIN)
    if "LD_LIBRARY_PATH" in env:
      ldLibraryPath = ldLibraryPath + ":" + env["LD_LIBRARY_PATH"]
    env["LD_LIBRARY_PATH"] = ldLibraryPath

  return env

###############
# RUN THE APP #
###############

def runApp(testURL, env, app, profileDir, extraArgs):
  if (IS_TEST_BUILD):
    # create certificate database for the profile
    certificateStatus = fillCertificateDB(profileDir)
    if certificateStatus != 0:
      log.info("ERROR FAIL Certificate integration")
      return certificateStatus
  
    # start ssltunnel to provide https:// URLs capability
    ssltunnel = DIST_BIN + "/ssltunnel" + BIN_SUFFIX
    ssltunnelProcess = Process(ssltunnel, [os.path.join(CERTS_DIR, "ssltunnel.cfg")], environment())
    log.info("SSL tunnel pid: %d", ssltunnelProcess.pid)
  
  "Run the app, returning the time at which it was started."
  # mark the start
  start = datetime.now()

  # now run with the profile we created
  cmd = app
  if IS_MAC and not IS_CAMINO and not cmd.endswith("-bin"):
    cmd += "-bin"
  cmd = os.path.abspath(cmd)

  args = []
  if IS_MAC:
    args.append("-foreground")

  if IS_CYGWIN:
    profileDirectory = commands.getoutput("cygpath -w \"" + profileDir + "/\"")
  else:
    profileDirectory = profileDir + "/"

  args.extend(("-no-remote", "-profile", profileDirectory))
  if IS_CAMINO:
    args.extend(("-url", testURL))
  else:
    args.append((testURL))
  args.extend(extraArgs)
  proc = Process(cmd, args, env = environment(env))
  log.info("Application pid: %d", proc.pid)
  status = proc.wait()
  if status != 0:
    log.info("ERROR FAIL Exited with code %d during test run", status)

  if (IS_TEST_BUILD):
    ssltunnelProcess.kill()
  
  return start