#!/usr/bin/env python # # Copyright 2007 Neal Norwitz # Portions 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. """Tokenize C++ source code.""" __author__ = 'nnorwitz@google.com (Neal Norwitz)' try: # Python 3.x import builtins except ImportError: # Python 2.x import __builtin__ as builtins import sys from cpp import utils if not hasattr(builtins, 'set'): # Nominal support for Python 2.3. from sets import Set as set # Add $ as a valid identifier char since so much code uses it. _letters = 'abcdefghijklmnopqrstuvwxyz' VALID_IDENTIFIER_CHARS = set(_letters + _letters.upper() + '_0123456789$') HEX_DIGITS = set('0123456789abcdefABCDEF') INT_OR_FLOAT_DIGITS = set('01234567890eE-+') # C++0x string preffixes. _STR_PREFIXES = set(('R', 'u8', 'u8R', 'u', 'uR', 'U', 'UR', 'L', 'LR')) # Token types. UNKNOWN = 'UNKNOWN' SYNTAX = 'SYNTAX' CONSTANT = 'CONSTANT' NAME = 'NAME' PREPROCESSOR = 'PREPROCESSOR' # Where the token originated from. This can be used for backtracking. # It is always set to WHENCE_STREAM in this code. WHENCE_STREAM, WHENCE_QUEUE = range(2) class Token(object): """Data container to represent a C++ token. Tokens can be identifiers, syntax char(s), constants, or pre-processor directives. start contains the index of the first char of the token in the source end contains the index of the last char of the token in the source """ def __init__(self, token_type, name, start, end): self.token_type = token_type self.name = name self.start = start self.end = end self.whence = WHENCE_STREAM def __str__(self): if not utils.DEBUG: return 'Token(%r)' % self.name return 'Token(%r, %s, %s)' % (self.name, self.start, self.end) __repr__ = __str__ def _GetString(source, start, i): i = source.find('"', i+1) while source[i-1] == '\\': # Count the trailing backslashes. backslash_count = 1 j = i - 2 while source[j] == '\\': backslash_count += 1 j -= 1 # When trailing backslashes are even, they escape each other. if (backslash_count % 2) == 0: break i = source.find('"', i+1) return i + 1 def _GetChar(source, start, i): # NOTE(nnorwitz): may not be quite correct, should be good enough. i = source.find("'", i+1) while source[i-1] == '\\': # Need to special case '\\'. if (i - 2) > start and source[i-2] == '\\': break i = source.find("'", i+1) # Try to handle unterminated single quotes (in a #if 0 block). if i < 0: i = start return i + 1 def GetTokens(source): """Returns a sequence of Tokens. Args: source: string of C++ source code. Yields: Token that represents the next token in the source. """ # Cache various valid character sets for speed. valid_identifier_chars = VALID_IDENTIFIER_CHARS hex_digits = HEX_DIGITS int_or_float_digits = INT_OR_FLOAT_DIGITS int_or_float_digits2 = int_or_float_digits | set('.') # Only ignore errors while in a #if 0 block. ignore_errors = False count_ifs = 0 i = 0 end = len(source) while i < end: # Skip whitespace. while i < end and source[i].isspace(): i += 1 if i >= end: return token_type = UNKNOWN start = i c = source[i] if c.isalpha() or c == '_': # Find a string token. token_type = NAME while source[i] in valid_identifier_chars: i += 1 # String and character constants can look like a name if # they are something like L"". if (source[i] == "'" and (i - start) == 1 and source[start:i] in 'uUL'): # u, U, and L are valid C++0x character preffixes. token_type = CONSTANT i = _GetChar(source, start, i) elif source[i] == "'" and source[start:i] in _STR_PREFIXES: token_type = CONSTANT i = _GetString(source, start, i) elif c == '/' and source[i+1] == '/': # Find // comments. i = source.find('\n', i) if i == -1: # Handle EOF. i = end continue elif c == '/' and source[i+1] == '*': # Find /* comments. */ i = source.find('*/', i) + 2 continue elif c in ':+-<>&|*=': # : or :: (plus other chars). token_type = SYNTAX i += 1 new_ch = source[i] if new_ch == c and c != '>': # Treat ">>" as two tokens. i += 1 elif c == '-' and new_ch == '>': i += 1 elif new_ch == '=': i += 1 elif c in '()[]{}~!?^%;/.,': # Handle single char tokens. token_type = SYNTAX i += 1 if c == '.' and source[i].isdigit(): token_type = CONSTANT i += 1 while source[i] in int_or_float_digits: i += 1 # Handle float suffixes. for suffix in ('l', 'f'): if suffix == source[i:i+1].lower(): i += 1 break elif c.isdigit(): # Find integer. token_type = CONSTANT if c == '0' and source[i+1] in 'xX': # Handle hex digits. i += 2 while source[i] in hex_digits: i += 1 else: while source[i] in int_or_float_digits2: i += 1 # Handle integer (and float) suffixes. for suffix in ('ull', 'll', 'ul', 'l', 'f', 'u'): size = len(suffix) if suffix == source[i:i+size].lower(): i += size break elif c == '"': # Find string. token_type = CONSTANT i = _GetString(source, start, i) elif c == "'": # Find char. token_type = CONSTANT i = _GetChar(source, start, i) elif c == '#': # Find pre-processor command. token_type = PREPROCESSOR got_if = source[i:i+3] == '#if' and source[i+3:i+4].isspace() if got_if: count_ifs += 1 elif source[i:i+6] == '#endif': count_ifs -= 1 if count_ifs == 0: ignore_errors = False # TODO(nnorwitz): handle preprocessor statements (\ continuations). while 1: i1 = source.find('\n', i) i2 = source.find('//', i) i3 = source.find('/*', i) i4 = source.find('"', i) # NOTE(nnorwitz): doesn't handle comments in #define macros. # Get the first important symbol (newline, comment, EOF/end). i = min([x for x in (i1, i2, i3, i4, end) if x != -1]) # Handle #include "dir//foo.h" properly. if source[i] == '"': i = source.find('"', i+1) + 1 assert i > 0 continue # Keep going if end of the line and the line ends with \. if not (i == i1 and source[i-1] == '\\'): if got_if: condition = source[start+4:i].lstrip() if (condition.startswith('0') or condition.startswith('(0)')): ignore_errors = True break i += 1 elif c == '\\': # Handle \ in code. # This is different from the pre-processor \ handling. i += 1 continue elif ignore_errors: # The tokenizer seems to be in pretty good shape. This # raise is conditionally disabled so that bogus code # in an #if 0 block can be handled. Since we will ignore # it anyways, this is probably fine. So disable the # exception and return the bogus char. i += 1 else: sys.stderr.write('Got invalid token in %s @ %d token:%s: %r\n' % ('?', i, c, source[i-10:i+10])) raise RuntimeError('unexpected token') if i <= 0: print('Invalid index, exiting now.') return yield Token(token_type, source[start:i], start, i) if __name__ == '__main__': def main(argv): """Driver mostly for testing purposes.""" for filename in argv[1:]: source = utils.ReadFile(filename) if source is None: continue for token in GetTokens(source): print('%-12s: %s' % (token.token_type, token.name)) # print('\r%6.2f%%' % (100.0 * index / token.end),) sys.stdout.write('\n') main(sys.argv) 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 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#!/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
  Mercurial
  Subversion

It is important for Git/Mercurial users to specify a tree/node/branch to diff
against by using the '--rev' option.
"""
# 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 GetEmail(prompt):
  """Prompts the user for their email address and returns it.

  The last used email address is saved to a file and offered up as a suggestion
  to the user. If the user presses enter without typing in anything the last
  used email address is used. If the user enters a new address, it is saved
  for next time we prompt.

  """
  last_email_file_name = os.path.expanduser("~/.last_codereview_email_address")
  last_email = ""
  if os.path.exists(last_email_file_name):
    try:
      last_email_file = open(last_email_file_name, "r")
      last_email = last_email_file.readline().strip("\n")
      last_email_file.close()
      prompt += " [%s]" % last_email
    except IOError, e:
      pass
  email = raw_input(prompt + ": ").strip()
  if email:
    try:
      last_email_file = open(last_email_file_name, "w")
      last_email_file.write(email)
      last_email_file.close()
    except IOError, e:
      pass
  else:
    email = last_email
  return email


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.
    """
    account_type = "GOOGLE"
    if self.host.endswith(".google.com"):
      # Needed for use inside Google.
      account_type = "HOSTED"
    req = self._CreateRequest(
        url="https://www.google.com/accounts/ClientLogin",
        data=urllib.urlencode({
            "Email": email,
            "Passwd": password,
            "service": "ah",
            "source": "rietveld-codereview-upload",
            "accountType": account_type,
        }),
    )
    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("--download_base", action="store_true",
                 dest="download_base", default=False,
                 help="Base files will be downloaded by the server "
                 "(side-by-side diffs may not work on files with CRs).")
group.add_option("--rev", action="store", dest="revision",
                 metavar="REV", default=None,
                 help="Branch/tree/revision to diff against (used by DVCS).")
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 = GetEmail("Email (login for uploading to %s)" % options.server)
    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 RunShellWithReturnCode(command, print_output=False,
                           universal_newlines=True):
  """Executes a command and returns the output from stdout and the return code.

  Args:
    command: Command to execute.
    print_output: If True, the output is printed to stdout.
                  If False, both stdout and stderr are ignored.
    universal_newlines: Use universal_newlines flag (default: True).

  Returns:
    Tuple (output, return code)
  """
  logging.info("Running %s", command)
  p = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                       shell=use_shell, universal_newlines=universal_newlines)
  if print_output:
    output_array = []
    while True:
      line = p.stdout.readline()
      if not line:
        break
      print line.strip("\n")
      output_array.append(line)
    output = "".join(output_array)
  else:
    output = p.stdout.read()
  p.wait()
  errout = p.stderr.read()
  if print_output and errout:
    print >>sys.stderr, errout
  p.stdout.close()
  p.stderr.close()
  return output, p.returncode


def RunShell(command, silent_ok=False, universal_newlines=True,
             print_output=False):
  data, retcode = RunShellWithReturnCode(command, print_output,
                                         universal_newlines)
  if retcode:
    ErrorExit("Got error status from %s:\n%s" % (command, data))
  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 __init__(self, options):
    """Constructor.

    Args:
      options: Command line options.
    """
    self.options = options

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

  def CheckForUnknownFiles(self):
    """Show an "are you sure?" prompt if there are unknown files."""
    unknown_files = self.GetUnknownFiles()
    if unknown_files:
      print "The following files are not added to version control:"
      for line in unknown_files:
        print line
      prompt = "Are you sure to continue?(y/N) "
      answer = raw_input(prompt).strip()
      if answer != "y":
        ErrorExit("User aborted")

  def GetBaseFile(self, filename):
    """Get the content of the upstream version of a file.

    Returns:
      A tuple (base_content, new_content, is_binary, status)
        base_content: The contents of the base file.
        new_content: For text files, this is empty.  For binary files, this is
          the contents of the new file, since the diff output won't contain
          information to reconstruct the current file.
        is_binary: True iff the file is binary.
        status: The status of the file.
    """

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


  def GetBaseFiles(self, diff):
    """Helper that calls GetBase file for each file in the patch.

    Returns:
      A dictionary that maps from filename to GetBaseFile's tuple.  Filenames
      are retrieved based on lines that start with "Index:" or
      "Property changes on:".
    """
    files = {}
    for line in diff.splitlines(True):
      if line.startswith('Index:') or line.startswith('Property changes on:'):
        unused, filename = line.split(':', 1)
        # On Windows if a file has property changes its filename uses '\'
        # instead of '/'.
        filename = filename.strip().replace('\\', '/')
        files[filename] = self.GetBaseFile(filename)
    return files


  def UploadBaseFiles(self, issue, rpc_server, patch_list, patchset, options,
                      files):
    """Uploads the base files (and if necessary, the current ones as well)."""

    def UploadFile(filename, file_id, content, is_binary, status, is_base):
      """Uploads a file to the server."""
      file_too_large = False
      if is_base:
        type = "base"
      else:
        type = "current"
      if len(content) > MAX_UPLOAD_SIZE:
        print ("Not uploading the %s file for %s because it's too large." %
               (type, filename))
        file_too_large = True
        content = ""
      checksum = md5.new(content).hexdigest()
      if options.verbose > 0 and not file_too_large:
        print "Uploading %s file for %s" % (type, filename)
      url = "/%d/upload_content/%d/%d" % (int(issue), int(patchset), file_id)
      form_fields = [("filename", filename),
                     ("status", status),
                     ("checksum", checksum),
                     ("is_binary", str(is_binary)),
                     ("is_current", str(not is_base)),
                    ]
      if file_too_large:
        form_fields.append(("file_too_large", "1"))
      if options.email:
        form_fields.append(("user", options.email))
      ctype, body = EncodeMultipartFormData(form_fields,
                                            [("data", filename, content)])
      response_body = rpc_server.Send(url, body,
                                      content_type=ctype)
      if not response_body.startswith("OK"):
        StatusUpdate("  --> %s" % response_body)
        sys.exit(1)

    patches = dict()
    [patches.setdefault(v, k) for k, v in patch_list]
    for filename in patches.keys():
      base_content, new_content, is_binary, status = files[filename]
      file_id_str = patches.get(filename)
      if file_id_str.find("nobase") != -1:
        base_content = None
        file_id_str = file_id_str[file_id_str.rfind("_") + 1:]
      file_id = int(file_id_str)
      if base_content != None:
        UploadFile(filename, file_id, base_content, is_binary, status, True)
      if new_content != None:
        UploadFile(filename, file_id, new_content, is_binary, status, False)

  def IsImage(self, filename):
    """Returns true if the filename has an image extension."""
    mimetype =  mimetypes.guess_type(filename)[0]
    if not mimetype:
      return False
    return mimetype.startswith("image/")


class SubversionVCS(VersionControlSystem):
  """Implementation of the VersionControlSystem interface for Subversion."""

  def __init__(self, options):
    super(SubversionVCS, self).__init__(options)
    if self.options.revision:
      match = re.match(r"(\d+)(:(\d+))?", self.options.revision)
      if not match: