#!/usr/bin/env python
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Creates a directory with with the unpacked contents of the remoting webapp.

The directory will contain a copy-of or a link-to to all remoting webapp
resources.  This includes HTML/JS and any plugin binaries. The script also
massages resulting files appropriately with host plugin data. Finally,
a zip archive for all of the above is produced.
"""

# Python 2.5 compatibility
from __future__ import with_statement

import os
import platform
import re
import shutil
import subprocess
import sys
import time
import zipfile

# Update the module path, assuming that this script is in src/remoting/webapp,
# and that the google_api_keys module is in src/google_apis. Note that
# sys.path[0] refers to the directory containing this script.
if __name__ == '__main__':
  sys.path.append(
      os.path.abspath(os.path.join(sys.path[0], '../../google_apis')))
import google_api_keys

def findAndReplace(filepath, findString, replaceString):
  """Does a search and replace on the contents of a file."""
  oldFilename = os.path.basename(filepath) + '.old'
  oldFilepath = os.path.join(os.path.dirname(filepath), oldFilename)
  os.rename(filepath, oldFilepath)
  with open(oldFilepath) as input:
    with open(filepath, 'w') as output:
      for s in input:
        output.write(s.replace(findString, replaceString))
  os.remove(oldFilepath)


def createZip(zip_path, directory):
  """Creates a zipfile at zip_path for the given directory."""
  zipfile_base = os.path.splitext(os.path.basename(zip_path))[0]
  zip = zipfile.ZipFile(zip_path, 'w', zipfile.ZIP_DEFLATED)
  for (root, dirs, files) in os.walk(directory):
    for f in files:
      full_path = os.path.join(root, f)
      rel_path = os.path.relpath(full_path, directory)
      zip.write(full_path, os.path.join(zipfile_base, rel_path))
  zip.close()


def replaceUrl(destination, url_name, url_value):
  """Updates a URL in both plugin_settings.js and manifest.json."""
  findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                 "'" + url_name + "'", "'" + url_value + "'")
  findAndReplace(os.path.join(destination, 'manifest.json'),
                 url_name, url_value)


def buildWebApp(buildtype, version, mimetype, destination, zip_path, plugin,
                files, locales, patches):
  """Does the main work of building the webapp directory and zipfile.

  Args:
    buildtype: the type of build ("Official" or "Dev")
    mimetype: A string with mimetype of plugin.
    destination: A string with path to directory where the webapp will be
                 written.
    zipfile: A string with path to the zipfile to create containing the
             contents of |destination|.
    plugin: A string with path to the binary plugin for this webapp.
    files: An array of strings listing the paths for resources to include
           in this webapp.
    locales: An array of strings listing locales, which are copied, along
             with their directory structure from the _locales directory down.
    patches: An array of strings listing patch files to be applied to the
             webapp directory. Paths in the patch file should be relative to
             the remoting/webapp directory, for example a/main.html. Since
             'git diff -p' works relative to the src/ directory, patches
             obtained this way will need to be edited.
  """
  # Ensure a fresh directory.
  try:
    shutil.rmtree(destination)
  except OSError:
    if os.path.exists(destination):
      raise
    else:
      pass
  os.mkdir(destination, 0775)

  # Use symlinks on linux and mac for faster compile/edit cycle.
  #
  # On Windows Vista platform.system() can return 'Microsoft' with some
  # versions of Python, see http://bugs.python.org/issue1082
  # should_symlink = platform.system() not in ['Windows', 'Microsoft']
  #
  # TODO(ajwong): Pending decision on http://crbug.com/27185 we may not be
  # able to load symlinked resources.
  should_symlink = False

  # Copy all the files.
  for current_file in files:
    destination_file = os.path.join(destination, os.path.basename(current_file))
    destination_dir = os.path.dirname(destination_file)
    if not os.path.exists(destination_dir):
      os.makedirs(destination_dir, 0775)

    if should_symlink:
      # TODO(ajwong): Detect if we're vista or higher.  Then use win32file
      # to create a symlink in that case.
      targetname = os.path.relpath(os.path.realpath(current_file),
                                   os.path.realpath(destination_file))
      os.symlink(targetname, destination_file)
    else:
      shutil.copy2(current_file, destination_file)

  # Copy all the locales, preserving directory structure
  destination_locales = os.path.join(destination, "_locales")
  os.mkdir(destination_locales , 0775)
  remoting_locales = os.path.join(destination, "remoting_locales")
  os.mkdir(remoting_locales , 0775)
  for current_locale in locales:
    extension = os.path.splitext(current_locale)[1]
    if extension == '.json':
      locale_id = os.path.split(os.path.split(current_locale)[0])[1]
      destination_dir = os.path.join(destination_locales, locale_id)
      destination_file = os.path.join(destination_dir,
                                      os.path.split(current_locale)[1])
      os.mkdir(destination_dir, 0775)
      shutil.copy2(current_locale, destination_file)
    elif extension == '.pak':
      destination_file = os.path.join(remoting_locales,
                                      os.path.split(current_locale)[1])
      shutil.copy2(current_locale, destination_file)
    else:
      raise Exception("Unknown extension: " + current_locale);

  # Create fake plugin files to appease the manifest checker.
  # It requires that if there is a plugin listed in the manifest that
  # there be a file in the plugin with that name.
  names = [
    'remoting_host_plugin.dll',  # Windows
    'remoting_host_plugin.plugin',  # Mac
    'libremoting_host_plugin.ia32.so',  # Linux 32
    'libremoting_host_plugin.x64.so'  # Linux 64
  ]
  pluginName = os.path.basename(plugin)

  for name in names:
    if name != pluginName:
      path = os.path.join(destination, name)
      f = open(path, 'w')
      f.write("placeholder for %s" % (name))
      f.close()

  # Copy the plugin. On some platforms (e.g. ChromeOS) plugin compilation may be
  # disabled, in which case we don't need to copy anything.
  if plugin:
    newPluginPath = os.path.join(destination, pluginName)
    if os.path.isdir(plugin):
      # On Mac we have a directory.
      shutil.copytree(plugin, newPluginPath)
    else:
      shutil.copy2(plugin, newPluginPath)

    # Strip the linux build.
    if ((platform.system() == 'Linux') and (buildtype == 'Official')):
      subprocess.call(["strip", newPluginPath])

  # Patch the files, if necessary. Do this before updating any placeholders
  # in case any of the diff contexts refer to the placeholders.
  for patch in patches:
    patchfile = os.path.join(os.getcwd(), patch)
    if subprocess.call(['patch', '-d', destination, '-i', patchfile,
                        '-p1', '-F0', '-s']) != 0:
      print 'Patch ' + patch + ' failed to apply.'
      return 1

  # Set the version number in the manifest version.
  findAndReplace(os.path.join(destination, 'manifest.json'),
                 'FULL_APP_VERSION',
                 version)

  # Set the correct mimetype.
  findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                 'HOST_PLUGIN_MIMETYPE',
                 mimetype)

  # Allow host names for google services/apis to be overriden via env vars.
  oauth2AccountsHost = os.environ.get(
      'OAUTH2_ACCOUNTS_HOST', 'https://accounts.google.com')
  oauth2ApiHost = os.environ.get(
      'OAUTH2_API_HOST', 'https://www.googleapis.com')
  directoryApiHost = os.environ.get(
      'DIRECTORY_API_HOST', 'https://www.googleapis.com')
  oauth2BaseUrl = oauth2AccountsHost + '/o/oauth2'
  oauth2ApiBaseUrl = oauth2ApiHost + '/oauth2'
  directoryApiBaseUrl = directoryApiHost + '/chromoting/v1'
  replaceUrl(destination, 'OAUTH2_BASE_URL', oauth2BaseUrl)
  replaceUrl(destination, 'OAUTH2_API_BASE_URL', oauth2ApiBaseUrl)
  replaceUrl(destination, 'DIRECTORY_API_BASE_URL', directoryApiBaseUrl)
  # Substitute hosts in the manifest's CSP list.
  findAndReplace(os.path.join(destination, 'manifest.json'),
                 'OAUTH2_ACCOUNTS_HOST', oauth2AccountsHost)
  # Ensure we list the API host only once if it's the same for multiple APIs.
  googleApiHosts = ' '.join(set([oauth2ApiHost, directoryApiHost]))
  findAndReplace(os.path.join(destination, 'manifest.json'),
                 'GOOGLE_API_HOSTS', googleApiHosts)

  # WCS and the OAuth trampoline are both hosted on talkgadget. Split them into
  # separate suffix/prefix variables to allow for wildcards in manifest.json.
  talkGadgetHostSuffix = os.environ.get(
      'TALK_GADGET_HOST_SUFFIX', 'talkgadget.google.com')
  talkGadgetHostPrefix = os.environ.get(
      'TALK_GADGET_HOST_PREFIX', 'https://chromoting-client.')
  oauth2RedirectHostPrefix = os.environ.get(
      'OAUTH2_REDIRECT_HOST_PREFIX', 'https://chromoting-oauth.')

  # Use a wildcard in the manifest.json host specs if the prefixes differ.
  talkGadgetHostJs = talkGadgetHostPrefix + talkGadgetHostSuffix
  talkGadgetBaseUrl = talkGadgetHostJs + '/talkgadget/'
  if talkGadgetHostPrefix == oauth2RedirectHostPrefix:
    talkGadgetHostJson = talkGadgetHostJs
  else:
    talkGadgetHostJson = 'https://*.' + talkGadgetHostSuffix

  # Set the correct OAuth2 redirect URL.
  oauth2RedirectHostJs = oauth2RedirectHostPrefix + talkGadgetHostSuffix
  oauth2RedirectHostJson = talkGadgetHostJson
  oauth2RedirectPath = '/talkgadget/oauth/chrome-remote-desktop'
  oauth2RedirectBaseUrlJs = oauth2RedirectHostJs + oauth2RedirectPath
  oauth2RedirectBaseUrlJson = oauth2RedirectHostJson + oauth2RedirectPath
  if buildtype == 'Official':
    oauth2RedirectUrlJs = ("'" + oauth2RedirectBaseUrlJs +
                           "/rel/' + chrome.i18n.getMessage('@@extension_id')")
    oauth2RedirectUrlJson = oauth2RedirectBaseUrlJson + '/rel/*'
  else:
    oauth2RedirectUrlJs = "'" + oauth2RedirectBaseUrlJs + "/dev'"
    oauth2RedirectUrlJson = oauth2RedirectBaseUrlJson + '/dev*'
  thirdPartyAuthUrlJs = "'" + oauth2RedirectBaseUrlJs + "/thirdpartyauth'"
  thirdPartyAuthUrlJson = oauth2RedirectBaseUrlJson + '/thirdpartyauth*'
  findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                 "'TALK_GADGET_URL'", "'" + talkGadgetBaseUrl + "'")
  findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                 "'OAUTH2_REDIRECT_URL'", oauth2RedirectUrlJs)
  findAndReplace(os.path.join(destination, 'manifest.json'),
                 'TALK_GADGET_HOST', talkGadgetHostJson)
  findAndReplace(os.path.join(destination, 'manifest.json'),
                 'OAUTH2_REDIRECT_URL', oauth2RedirectUrlJson)

  # Configure xmpp server and directory bot settings in the plugin.
  xmppServerAddress = os.environ.get(
      'XMPP_SERVER_ADDRESS', 'talk.google.com:5222')
  xmppServerUseTls = os.environ.get('XMPP_SERVER_USE_TLS', 'true')
  directoryBotJid = os.environ.get(
      'DIRECTORY_BOT_JID', 'remoting@bot.talk.google.com')

  findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                 "'XMPP_SERVER_ADDRESS'", "'" + xmppServerAddress + "'")
  findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                 "Boolean('XMPP_SERVER_USE_TLS')", xmppServerUseTls)
  findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                 "'DIRECTORY_BOT_JID'", "'" + directoryBotJid + "'")
  findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                 "'THIRD_PARTY_AUTH_REDIRECT_URL'",
                 thirdPartyAuthUrlJs)
  findAndReplace(os.path.join(destination, 'manifest.json'),
                 "THIRD_PARTY_AUTH_REDIRECT_URL",
                 thirdPartyAuthUrlJson)

  # Set the correct API keys.
  # For overriding the client ID/secret via env vars, see google_api_keys.py.
  apiClientId = google_api_keys.GetClientID('REMOTING')
  apiClientSecret = google_api_keys.GetClientSecret('REMOTING')
  apiClientIdV2 = google_api_keys.GetClientID('REMOTING_IDENTITY_API')

  findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                 "'API_CLIENT_ID'",
                 "'" + apiClientId + "'")
  findAndReplace(os.path.join(destination, 'plugin_settings.js'),
                 "'API_CLIENT_SECRET'",
                 "'" + apiClientSecret + "'")
  findAndReplace(os.path.join(destination, 'manifest.json'),
                 '"REMOTING_IDENTITY_API_CLIENT_ID"',
                 '"' + apiClientIdV2 + '"')

  # Use a consistent extension id for unofficial builds.
  if buildtype != 'Official':
    manifestKey = '"key": "remotingdevbuild",'
  else:
    manifestKey = ''
  findAndReplace(os.path.join(destination, 'manifest.json'),
                 'MANIFEST_KEY_FOR_UNOFFICIAL_BUILD', manifestKey)

  # Make the zipfile.
  createZip(zip_path, destination)

  return 0


def main():
  if len(sys.argv) < 7:
    print ('Usage: build-webapp.py '
           '<build-type> <version> <mime-type> <dst> <zip-path> <plugin> '
           '<other files...> [--patches <patches...>] '
           '[--locales <locales...>]')
    return 1

  arg_type = ''
  files = []
  locales = []
  patches = []
  for arg in sys.argv[7:]:
    if arg == '--locales' or arg == '--patches':
      arg_type = arg
    elif arg_type == '--locales':
      locales.append(arg)
    elif arg_type == '--patches':
      patches.append(arg)
    else:
      files.append(arg)

  return buildWebApp(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4],
                     sys.argv[5], sys.argv[6], files, locales, patches)


if __name__ == '__main__':
  sys.exit(main())
