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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:
         ErrorExit("Invalid Subversion revision %s." % self.options.revision)
       self.rev_start = match.group(1)
       self.rev_end = match.group(3)
     else:
       self.rev_start = self.rev_end = None
     # Cache output from "svn list -r REVNO dirname".
     # Keys: dirname, Values: 2-tuple (ouput for start rev and end rev).
     self.svnls_cache = {}
     # SVN base URL is required to fetch files deleted in an older revision.
     # Result is cached to not guess it over and over again in GetBaseFile().
     required = self.options.download_base or self.options.revision is not None
     self.svn_base = self._GuessBase(required)
 
   def GuessBase(self, required):
     """Wrapper for _GuessBase."""
     return self.svn_base
 
   def _GuessBase(self, required):
     """Returns the SVN base URL.
 
     Args:
       required: If true, exits if the url can't be guessed, otherwise None is
         returned.
     """
     info = RunShell(["svn", "info"])
     for line in info.splitlines():
       words = line.split()
       if len(words) == 2 and words[0] == "URL:":
         url = words[1]
         scheme, netloc, path, params, query, fragment = urlparse.urlparse(url)
         username, netloc = urllib.splituser(netloc)
         if username:
           logging.info("Removed username from base URL")
         if netloc.endswith("svn.python.org"):
           if netloc == "svn.python.org":
             if path.startswith("/projects/"):
               path = path[9:]
           elif netloc != "pythondev@svn.python.org":
             ErrorExit("Unrecognized Python URL: %s" % url)
           base = "http://svn.python.org/view/*checkout*%s/" % path
           logging.info("Guessed Python base = %s", base)
         elif netloc.endswith("svn.collab.net"):
           if path.startswith("/repos/"):
             path = path[6:]
           base = "http://svn.collab.net/viewvc/*checkout*%s/" % path
           logging.info("Guessed CollabNet base = %s", base)
         elif netloc.endswith(".googlecode.com"):
           path = path + "/"
           base = urlparse.urlunparse(("http", netloc, path, params,
                                       query, fragment))
           logging.info("Guessed Google Code base = %s", base)
         else:
           path = path + "/"
           base = urlparse.urlunparse((scheme, netloc, path, params,
                                       query, fragment))
           logging.info("Guessed base = %s", base)
         return base
     if required:
       ErrorExit("Can't find URL in output from svn info")
     return None
 
   def GenerateDiff(self, args):
     cmd = ["svn", "diff"]
     if self.options.revision:
       cmd += ["-r", self.options.revision]
     cmd.extend(args)
     data = RunShell(cmd)
     count = 0
     for line in data.splitlines():
       if line.startswith("Index:") or line.startswith("Property changes on:"):
         count += 1
         logging.info(line)
     if not count:
       ErrorExit("No valid patches found in output from svn diff")
     return data
 
   def _CollapseKeywords(self, content, keyword_str):
     """Collapses SVN keywords."""
     # svn cat translates keywords but svn diff doesn't. As a result of this
     # behavior patching.PatchChunks() fails with a chunk mismatch error.
     # This part was originally written by the Review Board development team
     # who had the same problem (http://reviews.review-board.org/r/276/).
     # Mapping of keywords to known aliases
     svn_keywords = {
       # Standard keywords
       'Date':                ['Date', 'LastChangedDate'],
       'Revision':            ['Revision', 'LastChangedRevision', 'Rev'],
       'Author':              ['Author', 'LastChangedBy'],
       'HeadURL':             ['HeadURL', 'URL'],
       'Id':                  ['Id'],
 
       # Aliases
       'LastChangedDate':     ['LastChangedDate', 'Date'],
       'LastChangedRevision': ['LastChangedRevision', 'Rev', 'Revision'],
       'LastChangedBy':       ['LastChangedBy', 'Author'],
       'URL':                 ['URL', 'HeadURL'],
     }
 
     def repl(m):
        if m.group(2):
          return "$%s::%s$" % (m.group(1), " " * len(m.group(3)))
        return "$%s$" % m.group(1)
     keywords = [keyword
                 for name in keyword_str.split(" ")
                 for keyword in svn_keywords.get(name, [])]
     return re.sub(r"\$(%s):(:?)([^\$]+)\$" % '|'.join(keywords), repl, content)
 
   def GetUnknownFiles(self):
     status = RunShell(["svn", "status", "--ignore-externals"], silent_ok=True)
     unknown_files = []
     for line in status.split("\n"):
       if line and line[0] == "?":
         unknown_files.append(line)
     return unknown_files
 
   def ReadFile(self, filename):
     """Returns the contents of a file."""
     file = open(filename, 'rb')
     result = ""
     try:
       result = file.read()
     finally:
       file.close()
     return result
 
   def GetStatus(self, filename):
     """Returns the status of a file."""
     if not self.options.revision:
       status = RunShell(["svn", "status", "--ignore-externals", filename])
       if not status:
         ErrorExit("svn status returned no output for %s" % filename)
       status_lines = status.splitlines()
       # If file is in a cl, the output will begin with
       # "\n--- Changelist 'cl_name':\n".  See
       # http://svn.collab.net/repos/svn/trunk/notes/changelist-design.txt
       if (len(status_lines) == 3 and
           not status_lines[0] and
           status_lines[1].startswith("--- Changelist")):
         status = status_lines[2]
       else:
         status = status_lines[0]
     # If we have a revision to diff against we need to run "svn list"
     # for the old and the new revision and compare the results to get
     # the correct status for a file.
     else:
       dirname, relfilename = os.path.split(filename)
       if dirname not in self.svnls_cache:
         cmd = ["svn", "list", "-r", self.rev_start, dirname or "."]
         out, returncode = RunShellWithReturnCode(cmd)
         if returncode:
           ErrorExit("Failed to get status for %s." % filename)
         old_files = out.splitlines()
         args = ["svn", "list"]
         if self.rev_end:
           args += ["-r", self.rev_end]
         cmd = args + [dirname or "."]
         out, returncode = RunShellWithReturnCode(cmd)
         if returncode:
           ErrorExit("Failed to run command %s" % cmd)
         self.svnls_cache[dirname] = (old_files, out.splitlines())
       old_files, new_files = self.svnls_cache[dirname]
       if relfilename in old_files and relfilename not in new_files:
         status = "D   "
       elif relfilename in old_files and relfilename in new_files:
         status = "M   "
       else:
         status = "A   "
     return status
 
   def GetBaseFile(self, filename):
     status = self.GetStatus(filename)
     base_content = None
     new_content = None
 
     # If a file is copied its status will be "A  +", which signifies
     # "addition-with-history".  See "svn st" for more information.  We need to
     # upload the original file or else diff parsing will fail if the file was
     # edited.
     if status[0] == "A" and status[3] != "+":
       # We'll need to upload the new content if we're adding a binary file
       # since diff's output won't contain it.
       mimetype = RunShell(["svn", "propget", "svn:mime-type", filename],
                           silent_ok=True)
       base_content = ""
       is_binary = mimetype and not mimetype.startswith("text/")
       if is_binary and self.IsImage(filename):
         new_content = self.ReadFile(filename)
     elif (status[0] in ("M", "D", "R") or
           (status[0] == "A" and status[3] == "+") or  # Copied file.
           (status[0] == " " and status[1] == "M")):  # Property change.
       args = []
       if self.options.revision:
         url = "%s/%s@%s" % (self.svn_base, filename, self.rev_start)
       else:
         # Don't change filename, it's needed later.
         url = filename
         args += ["-r", "BASE"]
       cmd = ["svn"] + args + ["propget", "svn:mime-type", url]
       mimetype, returncode = RunShellWithReturnCode(cmd)
       if returncode:
         # File does not exist in the requested revision.
         # Reset mimetype, it contains an error message.
         mimetype = ""
       get_base = False
       is_binary = mimetype and not mimetype.startswith("text/")
       if status[0] == " ":
         # Empty base content just to force an upload.
         base_content = ""
       elif is_binary:
         if self.IsImage(filename):
           get_base = True
           if status[0] == "M":
             if not self.rev_end:
               new_content = self.ReadFile(filename)
             else:
               url = "%s/%s@%s" % (self.svn_base, filename, self.rev_end)
               new_content = RunShell(["svn", "cat", url],
                                      universal_newlines=True, silent_ok=True)
         else:
           base_content = ""
       else:
         get_base = True
 
       if get_base:
         if is_binary:
           universal_newlines = False
         else:
           universal_newlines = True
         if self.rev_start:
           # "svn cat -r REV delete_file.txt" doesn't work. cat requires
           # the full URL with "@REV" appended instead of using "-r" option.
           url = "%s/%s@%s" % (self.svn_base, filename, self.rev_start)
           base_content = RunShell(["svn", "cat", url],
                                   universal_newlines=universal_newlines,
                                   silent_ok=True)
         else:
           base_content = RunShell(["svn", "cat", filename],
                                   universal_newlines=universal_newlines,
                                   silent_ok=True)
         if not is_binary:
           args = []
           if self.rev_start:
             url = "%s/%s@%s" % (self.svn_base, filename, self.rev_start)
           else:
             url = filename
             args += ["-r", "BASE"]
           cmd = ["svn"] + args + ["propget", "svn:keywords", url]
           keywords, returncode = RunShellWithReturnCode(cmd)
           if keywords and not returncode:
             base_content = self._CollapseKeywords(base_content, keywords)
     else:
       StatusUpdate("svn status returned unexpected output: %s" % status)
       sys.exit(1)
     return base_content, new_content, is_binary, status[0:5]
 
 
 class GitVCS(VersionControlSystem):
   """Implementation of the VersionControlSystem interface for Git."""
 
   def __init__(self, options):
     super(GitVCS, self).__init__(options)
     # Map of filename -> hash of base file.
     self.base_hashes = {}
 
   def GenerateDiff(self, extra_args):
     # This is more complicated than svn's GenerateDiff because we must convert
     # the diff output to include an svn-style "Index:" line as well as record
     # the hashes of the base files, so we can upload them along with our diff.
     if self.options.revision:
       extra_args = [self.options.revision] + extra_args
     gitdiff = RunShell(["git", "diff", "--full-index"] + extra_args)
     svndiff = []
     filecount = 0
     filename = None
     for line in gitdiff.splitlines():
       match = re.match(r"diff --git a/(.*) b/.*$", line)
       if match:
         filecount += 1
         filename = match.group(1)
         svndiff.append("Index: %s\n" % filename)
       else:
         # The "index" line in a git diff looks like this (long hashes elided):
         #   index 82c0d44..b2cee3f 100755
         # We want to save the left hash, as that identifies the base file.
         match = re.match(r"index (\w+)\.\.", line)
         if match:
           self.base_hashes[filename] = match.group(1)
       svndiff.append(line + "\n")
     if not filecount:
       ErrorExit("No valid patches found in output from git diff")
     return "".join(svndiff)
 
   def GetUnknownFiles(self):
     status = RunShell(["git", "ls-files", "--exclude-standard", "--others"],
                       silent_ok=True)
     return status.splitlines()
 
   def GetBaseFile(self, filename):
     hash = self.base_hashes[filename]
     base_content = None
     new_content = None
     is_binary = False
     if hash == "0" * 40:  # All-zero hash indicates no base file.
       status = "A"
       base_content = ""
     else:
       status = "M"
       base_content, returncode = RunShellWithReturnCode(["git", "show", hash])
       if returncode:
         ErrorExit("Got error status from 'git show %s'" % hash)
     return (base_content, new_content, is_binary, status)
 
 
 class MercurialVCS(VersionControlSystem):
   """Implementation of the VersionControlSystem interface for Mercurial."""
 
   def __init__(self, options, repo_dir):
     super(MercurialVCS, self).__init__(options)
     # Absolute path to repository (we can be in a subdir)
     self.repo_dir = os.path.normpath(repo_dir)
     # Compute the subdir
     cwd = os.path.normpath(os.getcwd())
     assert cwd.startswith(self.repo_dir)
     self.subdir = cwd[len(self.repo_dir):].lstrip(r"\/")
     if self.options.revision:
       self.base_rev = self.options.revision
     else:
       self.base_rev = RunShell(["hg", "parent", "-q"]).split(':')[1].strip()
 
   def _GetRelPath(self, filename):
     """Get relative path of a file according to the current directory,
     given its logical path in the repo."""
     assert filename.startswith(self.subdir), filename
     return filename[len(self.subdir):].lstrip(r"\/")
 
   def GenerateDiff(self, extra_args):
     # If no file specified, restrict to the current subdir
     extra_args = extra_args or ["."]
     cmd = ["hg", "diff", "--git", "-r", self.base_rev] + extra_args
     data = RunShell(cmd, silent_ok=True)
     svndiff = []
     filecount = 0
     for line in data.splitlines():
       m = re.match("diff --git a/(\S+) b/(\S+)", line)
       if m:
         # Modify line to make it look like as it comes from svn diff.
         # With this modification no changes on the server side are required
         # to make upload.py work with Mercurial repos.
         # NOTE: for proper handling of moved/copied files, we have to use
         # the second filename.
         filename = m.group(2)
         svndiff.append("Index: %s" % filename)
         svndiff.append("=" * 67)
         filecount += 1
         logging.info(line)
       else:
         svndiff.append(line)
     if not filecount:
       ErrorExit("No valid patches found in output from hg diff")
     return "\n".join(svndiff) + "\n"
 
   def GetUnknownFiles(self):
     """Return a list of files unknown to the VCS."""
     args = []
     status = RunShell(["hg", "status", "--rev", self.base_rev, "-u", "."],
         silent_ok=True)
     unknown_files = []
     for line in status.splitlines():
       st, fn = line.split(" ", 1)
       if st == "?":
         unknown_files.append(fn)
     return unknown_files
 
   def GetBaseFile(self, filename):
     # "hg status" and "hg cat" both take a path relative to the current subdir
     # rather than to the repo root, but "hg diff" has given us the full path
     # to the repo root.
     base_content = ""
     new_content = None
     is_binary = False
     oldrelpath = relpath = self._GetRelPath(filename)
     # "hg status -C" returns two lines for moved/copied files, one otherwise
     out = RunShell(["hg", "status", "-C", "--rev", self.base_rev, relpath])
     out = out.splitlines()
     # HACK: strip error message about missing file/directory if it isn't in
     # the working copy
     if out[0].startswith('%s: ' % relpath):
       out = out[1:]
     if len(out) > 1:
       # Moved/copied => considered as modified, use old filename to
       # retrieve base contents
       oldrelpath = out[1].strip()
       status = "M"
     else:
       status, _ = out[0].split(' ', 1)
     if status != "A":
       base_content = RunShell(["hg", "cat", "-r", self.base_rev, oldrelpath],
         silent_ok=True)
       is_binary = "\0" in base_content  # Mercurial's heuristic
     if status != "R":
       new_content = open(relpath, "rb").read()
       is_binary = is_binary or "\0" in new_content
     if is_binary and base_content:
       # Fetch again without converting newlines
       base_content = RunShell(["hg", "cat", "-r", self.base_rev, oldrelpath],
         silent_ok=True, universal_newlines=False)
     if not is_binary or not self.IsImage(relpath):
       new_content = None
     return base_content, new_content, is_binary, status
 
 
 # NOTE: The SplitPatch function is duplicated in engine.py, keep them in sync.
 def SplitPatch(data):
   """Splits a patch into separate pieces for each file.
 
   Args:
     data: A string containing the output of svn diff.
 
   Returns:
     A list of 2-tuple (filename, text) where text is the svn diff output
       pertaining to filename.
   """
   patches = []
   filename = None
   diff = []
   for line in data.splitlines(True):
     new_filename = None
     if line.startswith('Index:'):
       unused, new_filename = line.split(':', 1)
       new_filename = new_filename.strip()
     elif line.startswith('Property changes on:'):
       unused, temp_filename = line.split(':', 1)
       # When a file is modified, paths use '/' between directories, however
       # when a property is modified '\' is used on Windows.  Make them the same
       # otherwise the file shows up twice.
       temp_filename = temp_filename.strip().replace('\\', '/')
       if temp_filename != filename:
         # File has property changes but no modifications, create a new diff.
         new_filename = temp_filename
     if new_filename:
       if filename and diff:
         patches.append((filename, ''.join(diff)))
       filename = new_filename
       diff = [line]
       continue
     if diff is not None:
       diff.append(line)
   if filename and diff:
     patches.append((filename, ''.join(diff)))
   return patches
 
 
 def UploadSeparatePatches(issue, rpc_server, patchset, data, options):
   """Uploads a separate patch for each file in the diff output.
 
   Returns a list of [patch_key, filename] for each file.
   """
   patches = SplitPatch(data)
   rv = []
   for patch in patches:
     if len(patch[1]) > MAX_UPLOAD_SIZE:
       print ("Not uploading the patch for " + patch[0] +
              " because the file is too large.")
       continue
     form_fields = [("filename", patch[0])]
     if not options.download_base:
       form_fields.append(("content_upload", "1"))
     files = [("data", "data.diff", patch[1])]
     ctype, body = EncodeMultipartFormData(form_fields, files)
     url = "/%d/upload_patch/%d" % (int(issue), int(patchset))
     print "Uploading patch for " + patch[0]
     response_body = rpc_server.Send(url, body, content_type=ctype)
     lines = response_body.splitlines()
     if not lines or lines[0] != "OK":
       StatusUpdate("  --> %s" % response_body)
       sys.exit(1)
     rv.append([lines[1], patch[0]])
   return rv
 
 
 def GuessVCS(options):
   """Helper to guess the version control system.
 
   This examines the current directory, guesses which VersionControlSystem
   we're using, and returns an instance of the appropriate class.  Exit with an
   error if we can't figure it out.
 
   Returns:
     A VersionControlSystem instance. Exits if the VCS can't be guessed.
   """
   # Mercurial has a command to get the base directory of a repository
   # Try running it, but don't die if we don't have hg installed.
   # NOTE: we try Mercurial first as it can sit on top of an SVN working copy.
   try:
     out, returncode = RunShellWithReturnCode(["hg", "root"])
     if returncode == 0:
       return MercurialVCS(options, out.strip())
   except OSError, (errno, message):
     if errno != 2:  # ENOENT -- they don't have hg installed.
       raise
 
   # Subversion has a .svn in all working directories.
   if os.path.isdir('.svn'):
     logging.info("Guessed VCS = Subversion")
     return SubversionVCS(options)
 
   # Git has a command to test if you're in a git tree.
   # Try running it, but don't die if we don't have git installed.
   try:
     out, returncode = RunShellWithReturnCode(["git", "rev-parse",
                                               "--is-inside-work-tree"])
     if returncode == 0:
       return GitVCS(options)
   except OSError, (errno, message):
     if errno != 2:  # ENOENT -- they don't have git installed.
       raise
 
   ErrorExit(("Could not guess version control system. "
              "Are you in a working copy directory?"))
 
 
 def RealMain(argv, data=None):
   """The real main function.
 
   Args:
     argv: Command line arguments.
     data: Diff contents. If None (default) the diff is generated by
       the VersionControlSystem implementation returned by GuessVCS().
 
   Returns:
     A 2-tuple (issue id, patchset id).
     The patchset id is None if the base files are not uploaded by this
     script (applies only to SVN checkouts).
   """
   logging.basicConfig(format=("%(asctime).19s %(levelname)s %(filename)s:"
                               "%(lineno)s %(message)s "))
   os.environ['LC_ALL'] = 'C'
   options, args = parser.parse_args(argv[1:])
   global verbosity
   verbosity = options.verbose
   if verbosity >= 3:
     logging.getLogger().setLevel(logging.DEBUG)
   elif verbosity >= 2:
     logging.getLogger().setLevel(logging.INFO)
   vcs = GuessVCS(options)
   if isinstance(vcs, SubversionVCS):
     # base field is only allowed for Subversion.
     # Note: Fetching base files may become deprecated in future releases.
     base = vcs.GuessBase(options.download_base)
   else:
     base = None
   if not base and options.download_base:
     options.download_base = True
     logging.info("Enabled upload of base file")
   if not options.assume_yes:
     vcs.CheckForUnknownFiles()
   if data is None:
     data = vcs.GenerateDiff(args)
   files = vcs.GetBaseFiles(data)
   if verbosity >= 1:
     print "Upload server:", options.server, "(change with -s/--server)"
   if options.issue:
     prompt = "Message describing this patch set: "
   else:
     prompt = "New issue subject: "
   message = options.message or raw_input(prompt).strip()
   if not message:
     ErrorExit("A non-empty message is required")
   rpc_server = GetRpcServer(options)
   form_fields = [("subject", message)]
   if base:
     form_fields.append(("base", base))
   if options.issue:
     form_fields.append(("issue", str(options.issue)))
   if options.email:
     form_fields.append(("user", options.email))
   if options.reviewers:
     for reviewer in options.reviewers.split(','):
       if "@" in reviewer and not reviewer.split("@")[1].count(".") == 1:
         ErrorExit("Invalid email address: %s" % reviewer)
     form_fields.append(("reviewers", options.reviewers))
   if options.cc:
     for cc in options.cc.split(','):
       if "@" in cc and not cc.split("@")[1].count(".") == 1:
         ErrorExit("Invalid email address: %s" % cc)
     form_fields.append(("cc", options.cc))
   description = options.description
   if options.description_file:
     if options.description:
       ErrorExit("Can't specify description and description_file")
     file = open(options.description_file, 'r')
     description = file.read()
     file.close()
   if description:
     form_fields.append(("description", description))
   # Send a hash of all the base file so the server can determine if a copy
   # already exists in an earlier patchset.
   base_hashes = ""
   for file, info in files.iteritems():
     if not info[0] is None:
       checksum = md5.new(info[0]).hexdigest()
       if base_hashes:
         base_hashes += "|"
       base_hashes += checksum + ":" + file
   form_fields.append(("base_hashes", base_hashes))
   # If we're uploading base files, don't send the email before the uploads, so
   # that it contains the file status.
   if options.send_mail and options.download_base:
     form_fields.append(("send_mail", "1"))
   if not options.download_base:
     form_fields.append(("content_upload", "1"))
   if len(data) > MAX_UPLOAD_SIZE:
     print "Patch is large, so uploading file patches separately."
     uploaded_diff_file = []
     form_fields.append(("separate_patches", "1"))
   else:
     uploaded_diff_file = [("data", "data.diff", data)]
   ctype, body = EncodeMultipartFormData(form_fields, uploaded_diff_file)
   response_body = rpc_server.Send("/upload", body, content_type=ctype)
   patchset = None
   if not options.download_base or not uploaded_diff_file:
     lines = response_body.splitlines()
     if len(lines) >= 2:
       msg = lines[0]
       patchset = lines[1].strip()
       patches = [x.split(" ", 1) for x in lines[2:]]
     else:
       msg = response_body
   else:
     msg = response_body
   StatusUpdate(msg)
   if not response_body.startswith("Issue created.") and \
   not response_body.startswith("Issue updated."):
     sys.exit(0)
   issue = msg[msg.rfind("/")+1:]
 
   if not uploaded_diff_file:
     result = UploadSeparatePatches(issue, rpc_server, patchset, data, options)
     if not options.download_base:
       patches = result
 
   if not options.download_base:
     vcs.UploadBaseFiles(issue, rpc_server, patches, patchset, options, files)
     if options.send_mail:
       rpc_server.Send("/" + issue + "/mail", payload="")
   return issue, patchset
 
 
 def main():
   try:
     RealMain(sys.argv)
   except KeyboardInterrupt:
     print
     StatusUpdate("Interrupted.")
     sys.exit(1)
 
 
 if __name__ == "__main__":
   main()

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