#!/usr/bin/env python

#

# Copyright 2007 Google Inc.

#

# Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Tool for uploading diffs from a version control system to the codereview app.

Usage summary: upload.py [options] [-- diff_options]

Diff options are passed to the diff command of the underlying system.

Supported version control systems:

  Git

  Subversion

(It is important for Git users to specify a tree-ish to diff against.)

"""

# This code is derived from appcfg.py in the App Engine SDK (open source),

# and from ASPN recipe #146306.

import cookielib

import getpass

import logging

import md5

import mimetypes

import optparse

import os

import re

import socket

import subprocess

import sys

import urllib

import urllib2

import urlparse

try:

  import readline

except ImportError:

  pass

# The logging verbosity:

#  0: Errors only.

#  1: Status messages.

#  2: Info logs.

#  3: Debug logs.

verbosity = 1

# Max size of patch or base file.

MAX_UPLOAD_SIZE = 900 * 1024

def StatusUpdate(msg):

  """Print a status message to stdout.

  If 'verbosity' is greater than 0, print the message.

  Args:

    msg: The string to print.

  """

  if verbosity > 0:

    print msg

def ErrorExit(msg):

  """Print an error message to stderr and exit."""

  print >>sys.stderr, msg

  sys.exit(1)

class ClientLoginError(urllib2.HTTPError):

  """Raised to indicate there was an error authenticating with ClientLogin."""

  def __init__(self, url, code, msg, headers, args):

    urllib2.HTTPError.__init__(self, url, code, msg, headers, None)

    self.args = args

    self.reason = args["Error"]

class AbstractRpcServer(object):

  """Provides a common interface for a simple RPC server."""

  def __init__(self, host, auth_function, host_override=None, extra_headers={},

               save_cookies=False):

    """Creates a new HttpRpcServer.

    Args:

      host: The host to send requests to.

      auth_function: A function that takes no arguments and returns an

        (email, password) tuple when called. Will be called if authentication

        is required.

      host_override: The host header to send to the server (defaults to host).

      extra_headers: A dict of extra headers to append to every request.

      save_cookies: If True, save the authentication cookies to local disk.

        If False, use an in-memory cookiejar instead.  Subclasses must

        implement this functionality.  Defaults to False.

    """

    self.host = host

    self.host_override = host_override

    self.auth_function = auth_function

    self.authenticated = False

    self.extra_headers = extra_headers

    self.save_cookies = save_cookies

    self.opener = self._GetOpener()

    if self.host_override:

      logging.info("Server: %s; Host: %s", self.host, self.host_override)

    else:

      logging.info("Server: %s", self.host)

  def _GetOpener(self):

    """Returns an OpenerDirector for making HTTP requests.

    Returns:

      A urllib2.OpenerDirector object.

    """

    raise NotImplementedError()

  def _CreateRequest(self, url, data=None):

    """Creates a new urllib request."""

    logging.debug("Creating request for: '%s' with payload:\n%s", url, data)

    req = urllib2.Request(url, data=data)

    if self.host_override:

      req.add_header("Host", self.host_override)

    for key, value in self.extra_headers.iteritems():

      req.add_header(key, value)

    return req

  def _GetAuthToken(self, email, password):

    """Uses ClientLogin to authenticate the user, returning an auth token.

    Args:

      email:    The user's email address

      password: The user's password

    Raises:

      ClientLoginError: If there was an error authenticating with ClientLogin.

      HTTPError: If there was some other form of HTTP error.

    Returns:

      The authentication token returned by ClientLogin.

    """

    req = self._CreateRequest(

        url="https://www.google.com/accounts/ClientLogin",

        data=urllib.urlencode({

            "Email": email,

            "Passwd": password,

            "service": "ah",

            "source": "rietveld-codereview-upload",

            "accountType": "GOOGLE",

        })

    )

    try:

      response = self.opener.open(req)

      response_body = response.read()

      response_dict = dict(x.split("=")

                           for x in response_body.split("\n") if x)

      return response_dict["Auth"]

    except urllib2.HTTPError, e:

      if e.code == 403:

        body = e.read()

        response_dict = dict(x.split("=", 1) for x in body.split("\n") if x)

        raise ClientLoginError(req.get_full_url(), e.code, e.msg,

                               e.headers, response_dict)

      else:

        raise

  def _GetAuthCookie(self, auth_token):

    """Fetches authentication cookies for an authentication token.

    Args:

      auth_token: The authentication token returned by ClientLogin.

    Raises:

      HTTPError: If there was an error fetching the authentication cookies.

    """

    # This is a dummy value to allow us to identify when we're successful.

    continue_location = "http://localhost/"

    args = {"continue": continue_location, "auth": auth_token}

    req = self._CreateRequest("http://%s/_ah/login?%s" %

                              (self.host, urllib.urlencode(args)))

    try:

      response = self.opener.open(req)

    except urllib2.HTTPError, e:

      response = e

    if (response.code != 302 or

        response.info()["location"] != continue_location):

      raise urllib2.HTTPError(req.get_full_url(), response.code, response.msg,

                              response.headers, response.fp)

    self.authenticated = True

  def _Authenticate(self):

    """Authenticates the user.

    The authentication process works as follows:

     1) We get a username and password from the user

     2) We use ClientLogin to obtain an AUTH token for the user

        (see http://code.google.com/apis/accounts/AuthForInstalledApps.html).

     3) We pass the auth token to /_ah/login on the server to obtain an

        authentication cookie. If login was successful, it tries to redirect

        us to the URL we provided.

    If we attempt to access the upload API without first obtaining an

    authentication cookie, it returns a 401 response and directs us to

    authenticate ourselves with ClientLogin.

    """

    for i in range(3):

      credentials = self.auth_function()

      try:

        auth_token = self._GetAuthToken(credentials[0], credentials[1])

      except ClientLoginError, e:

        if e.reason == "BadAuthentication":

          print >>sys.stderr, "Invalid username or password."

          continue

        if e.reason == "CaptchaRequired":

          print >>sys.stderr, (

              "Please go to\n"

              "https://www.google.com/accounts/DisplayUnlockCaptcha\n"

              "and verify you are a human.  Then try again.")

          break

        if e.reason == "NotVerified":

          print >>sys.stderr, "Account not verified."

          break

        if e.reason == "TermsNotAgreed":

          print >>sys.stderr, "User has not agreed to TOS."

          break

        if e.reason == "AccountDeleted":

          print >>sys.stderr, "The user account has been deleted."

          break

        if e.reason == "AccountDisabled":

          print >>sys.stderr, "The user account has been disabled."

          break

        if e.reason == "ServiceDisabled":

          print >>sys.stderr, ("The user's access to the service has been "

                               "disabled.")

          break

        if e.reason == "ServiceUnavailable":

          print >>sys.stderr, "The service is not available; try again later."

          break

        raise

      self._GetAuthCookie(auth_token)

      return

  def Send(self, request_path, payload=None,

           content_type="application/octet-stream",

           timeout=None,

           **kwargs):

    """Sends an RPC and returns the response.

    Args:

      request_path: The path to send the request to, eg /api/appversion/create.

      payload: The body of the request, or None to send an empty request.

      content_type: The Content-Type header to use.

      timeout: timeout in seconds; default None i.e. no timeout.

        (Note: for large requests on OS X, the timeout doesn't work right.)

      kwargs: Any keyword arguments are converted into query string parameters.

    Returns:

      The response body, as a string.

    """

    # TODO: Don't require authentication.  Let the server say

    # whether it is necessary.

    if not self.authenticated:

      self._Authenticate()

    old_timeout = socket.getdefaulttimeout()

    socket.setdefaulttimeout(timeout)

    try:

      tries = 0

      while True:

        tries += 1

        args = dict(kwargs)

        url = "http://%s%s" % (self.host, request_path)

        if args:

          url += "?" + urllib.urlencode(args)

        req = self._CreateRequest(url=url, data=payload)

        req.add_header("Content-Type", content_type)

        try:

          f = self.opener.open(req)

          response = f.read()

          f.close()

          return response

        except urllib2.HTTPError, e:

          if tries > 3:

            raise

          elif e.code == 401:

            self._Authenticate()

##           elif e.code >= 500 and e.code < 600:

##             # Server Error - try again.

##             continue

          else:

            raise

    finally:

      socket.setdefaulttimeout(old_timeout)

class HttpRpcServer(AbstractRpcServer):

  """Provides a simplified RPC-style interface for HTTP requests."""

  def _Authenticate(self):

    """Save the cookie jar after authentication."""

    super(HttpRpcServer, self)._Authenticate()

    if self.save_cookies:

      StatusUpdate("Saving authentication cookies to %s" % self.cookie_file)

      self.cookie_jar.save()

  def _GetOpener(self):

    """Returns an OpenerDirector that supports cookies and ignores redirects.

    Returns:

      A urllib2.OpenerDirector object.

    """

    opener = urllib2.OpenerDirector()

    opener.add_handler(urllib2.ProxyHandler())

    opener.add_handler(urllib2.UnknownHandler())

    opener.add_handler(urllib2.HTTPHandler())

    opener.add_handler(urllib2.HTTPDefaultErrorHandler())

    opener.add_handler(urllib2.HTTPSHandler())

    opener.add_handler(urllib2.HTTPErrorProcessor())

    if self.save_cookies:

      self.cookie_file = os.path.expanduser("~/.codereview_upload_cookies")

      self.cookie_jar = cookielib.MozillaCookieJar(self.cookie_file)

      if os.path.exists(self.cookie_file):

        try:

          self.cookie_jar.load()

          self.authenticated = True

          StatusUpdate("Loaded authentication cookies from %s" %

                       self.cookie_file)

        except (cookielib.LoadError, IOError):

          # Failed to load cookies - just ignore them.

          pass

      else:

        # Create an empty cookie file with mode 600

        fd = os.open(self.cookie_file, os.O_CREAT, 0600)

        os.close(fd)

      # Always chmod the cookie file

      os.chmod(self.cookie_file, 0600)

    else:

      # Don't save cookies across runs of update.py.

      self.cookie_jar = cookielib.CookieJar()

    opener.add_handler(urllib2.HTTPCookieProcessor(self.cookie_jar))

    return opener

parser = optparse.OptionParser(usage="%prog [options] [-- diff_options]")

parser.add_option("-y", "--assume_yes", action="store_true",

                  dest="assume_yes", default=False,

                  help="Assume that the answer to yes/no questions is 'yes'.")

# Logging

group = parser.add_option_group("Logging options")

group.add_option("-q", "--quiet", action="store_const", const=0,

                 dest="verbose", help="Print errors only.")

group.add_option("-v", "--verbose", action="store_const", const=2,

                 dest="verbose", default=1,

                 help="Print info level logs (default).")

group.add_option("--noisy", action="store_const", const=3,

                 dest="verbose", help="Print all logs.")

# Review server

group = parser.add_option_group("Review server options")

group.add_option("-s", "--server", action="store", dest="server",

                 default="codereview.appspot.com",

                 metavar="SERVER",

                 help=("The server to upload to. The format is host[:port]. "

                       "Defaults to 'codereview.appspot.com'."))

group.add_option("-e", "--email", action="store", dest="email",

                 metavar="EMAIL", default=None,

                 help="The username to use. Will prompt if omitted.")

group.add_option("-H", "--host", action="store", dest="host",

                 metavar="HOST", default=None,

                 help="Overrides the Host header sent with all RPCs.")

group.add_option("--no_cookies", action="store_false",

                 dest="save_cookies", default=True,

                 help="Do not save authentication cookies to local disk.")

# Issue

group = parser.add_option_group("Issue options")

group.add_option("-d", "--description", action="store", dest="description",

                 metavar="DESCRIPTION", default=None,

                 help="Optional description when creating an issue.")

group.add_option("-f", "--description_file", action="store",

                 dest="description_file", metavar="DESCRIPTION_FILE",

                 default=None,

                 help="Optional path of a file that contains "

                      "the description when creating an issue.")

group.add_option("-r", "--reviewers", action="store", dest="reviewers",

                 metavar="REVIEWERS", default=None,

                 help="Add reviewers (comma separated email addresses).")

group.add_option("--cc", action="store", dest="cc",

                 metavar="CC", default=None,

                 help="Add CC (comma separated email addresses).")

# Upload options

group = parser.add_option_group("Patch options")

group.add_option("-m", "--message", action="store", dest="message",

                 metavar="MESSAGE", default=None,

                 help="A message to identify the patch. "

                      "Will prompt if omitted.")

group.add_option("-i", "--issue", type="int", action="store",

                 metavar="ISSUE", default=None,

                 help="Issue number to which to add. Defaults to new issue.")

group.add_option("-l", "--local_base", action="store_true",

                 dest="local_base", default=False,

                 help="Base files will be uploaded.")

group.add_option("--send_mail", action="store_true",

                 dest="send_mail", default=False,

                 help="Send notification email to reviewers.")

def GetRpcServer(options):

  """Returns an instance of an AbstractRpcServer.

  Returns:

    A new AbstractRpcServer, on which RPC calls can be made.

  """

  rpc_server_class = HttpRpcServer

  def GetUserCredentials():

    """Prompts the user for a username and password."""

    email = options.email

    if email is None:

      email = raw_input("Email: ").strip()

    password = getpass.getpass("Password for %s: " % email)

    return (email, password)

  # If this is the dev_appserver, use fake authentication.

  host = (options.host or options.server).lower()

  if host == "localhost" or host.startswith("localhost:"):

    email = options.email

    if email is None:

      email = "test@example.com"

      logging.info("Using debug user %s.  Override with --email" % email)

    server = rpc_server_class(

        options.server,

        lambda: (email, "password"),

        host_override=options.host,

        extra_headers={"Cookie":

                       'dev_appserver_login="%s:False"' % email},

        save_cookies=options.save_cookies)

    # Don't try to talk to ClientLogin.

    server.authenticated = True

    return server

  return rpc_server_class(options.server, GetUserCredentials,

                          host_override=options.host,

                          save_cookies=options.save_cookies)

def EncodeMultipartFormData(fields, files):

  """Encode form fields for multipart/form-data.

  Args:

    fields: A sequence of (name, value) elements for regular form fields.

    files: A sequence of (name, filename, value) elements for data to be

           uploaded as files.

  Returns:

    (content_type, body) ready for httplib.HTTP instance.

  Source:

    http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/146306

  """

  BOUNDARY = '-M-A-G-I-C---B-O-U-N-D-A-R-Y-'

  CRLF = '\r\n'

  lines = []

  for (key, value) in fields:

    lines.append('--' + BOUNDARY)

    lines.append('Content-Disposition: form-data; name="%s"' % key)

    lines.append('')

    lines.append(value)

  for (key, filename, value) in files:

    lines.append('--' + BOUNDARY)

    lines.append('Content-Disposition: form-data; name="%s"; filename="%s"' %

             (key, filename))

    lines.append('Content-Type: %s' % GetContentType(filename))

    lines.append('')

    lines.append(value)

  lines.append('--' + BOUNDARY + '--')

  lines.append('')

  body = CRLF.join(lines)

  content_type = 'multipart/form-data; boundary=%s' % BOUNDARY

  return content_type, body

def GetContentType(filename):

  """Helper to guess the content-type from the filename."""

  return mimetypes.guess_type(filename)[0] or 'application/octet-stream'

# Use a shell for subcommands on Windows to get a PATH search.

use_shell = sys.platform.startswith("win")

def RunShell(command, silent_ok=False, universal_newlines=False):

  logging.info("Running %s", command)

  p = subprocess.Popen(command, stdout=subprocess.PIPE,

                       stderr=subprocess.STDOUT, shell=use_shell,

                       universal_newlines=universal_newlines)

  data = p.stdout.read()

  p.wait()

  p.stdout.close()

  if p.returncode:

    ErrorExit("Got error status from %s" % command)

  if not silent_ok and not data:

    ErrorExit("No output from %s" % command)

  return data

class VersionControlSystem(object):

  """Abstract base class providing an interface to the VCS."""

  def GenerateDiff(self, args):

    """Return the current diff as a string.

    Args:

      args: Extra arguments to pass to the diff command.

    """

    raise NotImplementedError(

        "abstract method -- subclass %s must override" % self.__class__)

  def GetUnknownFiles(self):

    """Return a list of files unknown to the VCS."""

    raise NotImplementedError(