# hgweb/server.py - The standalone hg web server.

#

# Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net>

# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

import os, sys, errno, urllib, BaseHTTPServer, socket, SocketServer, traceback

from mercurial import util, error

from mercurial.i18n import _

def _splitURI(uri):

    """ Return path and query splited from uri

    Just like CGI environment, the path is unquoted, the query is

    not.

    """

    if '?' in uri:

        path, query = uri.split('?', 1)

    else:

        path, query = uri, ''

    return urllib.unquote(path), query

class _error_logger(object):

    def __init__(self, handler):

        self.handler = handler

    def flush(self):

        pass

    def write(self, str):

        self.writelines(str.split('\n'))

    def writelines(self, seq):

        for msg in seq:

            self.handler.log_error("HG error:  %s", msg)

class _httprequesthandler(BaseHTTPServer.BaseHTTPRequestHandler):

    url_scheme = 'http'

    @staticmethod

    def preparehttpserver(httpserver, ssl_cert):

        """Prepare .socket of new HTTPServer instance"""

        pass

    def __init__(self, *args, **kargs):

        self.protocol_version = 'HTTP/1.1'

        BaseHTTPServer.BaseHTTPRequestHandler.__init__(self, *args, **kargs)

    def _log_any(self, fp, format, *args):

        fp.write("%s - - [%s] %s\n" % (self.client_address[0],

                                       self.log_date_time_string(),

                                       format % args))

        fp.flush()

    def log_error(self, format, *args):

        self._log_any(self.server.errorlog, format, *args)

    def log_message(self, format, *args):

        self._log_any(self.server.accesslog, format, *args)

    def do_write(self):

        try:

            self.do_hgweb()

        except socket.error, inst:

            if inst[0] != errno.EPIPE:

                raise

    def do_POST(self):

        try:

            self.do_write()

        except StandardError:

            self._start_response("500 Internal Server Error", [])

            self._write("Internal Server Error")

            tb = "".join(traceback.format_exception(*sys.exc_info()))

            self.log_error("Exception happened during processing "

                           "request '%s':\n%s", self.path, tb)

    def do_GET(self):

        self.do_POST()

    def do_hgweb(self):

        path, query = _splitURI(self.path)

        env = {}

        env['GATEWAY_INTERFACE'] = 'CGI/1.1'

        env['REQUEST_METHOD'] = self.command

        env['SERVER_NAME'] = self.server.server_name

        env['SERVER_PORT'] = str(self.server.server_port)

        env['REQUEST_URI'] = self.path

        env['SCRIPT_NAME'] = self.server.prefix

        env['PATH_INFO'] = path[len(self.server.prefix):]

        env['REMOTE_HOST'] = self.client_address[0]

        env['REMOTE_ADDR'] = self.client_address[0]

        if query:

            env['QUERY_STRING'] = query

        if self.headers.typeheader is None:

            env['CONTENT_TYPE'] = self.headers.type

        else:

            env['CONTENT_TYPE'] = self.headers.typeheader

        length = self.headers.getheader('content-length')

        if length:

            env['CONTENT_LENGTH'] = length

        for header in [h for h in self.headers.keys()

                       if h not in ('content-type', 'content-length')]:

            hkey = 'HTTP_' + header.replace('-', '_').upper()

            hval = self.headers.getheader(header)

            hval = hval.replace('\n', '').strip()

            if hval:

                env[hkey] = hval

        env['SERVER_PROTOCOL'] = self.request_version

        env['wsgi.version'] = (1, 0)

        env['wsgi.url_scheme'] = self.url_scheme

        env['wsgi.input'] = self.rfile

        env['wsgi.errors'] = _error_logger(self)

        env['wsgi.multithread'] = isinstance(self.server,

                                             SocketServer.ThreadingMixIn)

        env['wsgi.multiprocess'] = isinstance(self.server,

                                              SocketServer.ForkingMixIn)

        env['wsgi.run_once'] = 0

        self.close_connection = True

        self.saved_status = None

        self.saved_headers = []

        self.sent_headers = False

        self.length = None

        for chunk in self.server.application(env, self._start_response):

            self._write(chunk)

    def send_headers(self):

        if not self.saved_status:

            raise AssertionError("Sending headers before "

                                 "start_response() called")

        saved_status = self.saved_status.split(None, 1)

        saved_status[0] = int(saved_status[0])

        self.send_response(*saved_status)

        should_close = True

        for h in self.saved_headers:

            self.send_header(*h)

            if h[0].lower() == 'content-length':

                should_close = False

                self.length = int(h[1])

        # The value of the Connection header is a list of case-insensitive

        # tokens separated by commas and optional whitespace.

        if 'close' in [token.strip().lower() for token in

                       self.headers.get('connection', '').split(',')]:

            should_close = True

        if should_close:

            self.send_header('Connection', 'close')

        self.close_connection = should_close

        self.end_headers()

        self.sent_headers = True

    def _start_response(self, http_status, headers, exc_info=None):

        code, msg = http_status.split(None, 1)

        code = int(code)

        self.saved_status = http_status

        bad_headers = ('connection', 'transfer-encoding')

        self.saved_headers = [h for h in headers

                              if h[0].lower() not in bad_headers]

        return self._write

    def _write(self, data):

        if not self.saved_status:

            raise AssertionError("data written before start_response() called")

        elif not self.sent_headers:

            self.send_headers()

        if self.length is not None:

            if len(data) > self.length:

                raise AssertionError("Content-length header sent, but more "

                                     "bytes than specified are being written.")

            self.length = self.length - len(data)

        self.wfile.write(data)

        self.wfile.flush()

class _httprequesthandleropenssl(_httprequesthandler):

    """HTTPS handler based on pyOpenSSL"""

    url_scheme = 'https'

    @staticmethod

    def preparehttpserver(httpserver, ssl_cert):

        try:

            import OpenSSL

            OpenSSL.SSL.Context

        except ImportError:

            raise util.Abort(_("SSL support is unavailable"))

        ctx = OpenSSL.SSL.Context(OpenSSL.SSL.SSLv23_METHOD)

        ctx.use_privatekey_file(ssl_cert)

        ctx.use_certificate_file(ssl_cert)

        sock = socket.socket(httpserver.address_family, httpserver.socket_type)

        httpserver.socket = OpenSSL.SSL.Connection(ctx, sock)

        httpserver.server_bind()

        httpserver.server_activate()

    def setup(self):

        self.connection = self.request

        self.rfile = socket._fileobject(self.request, "rb", self.rbufsize)

        self.wfile = socket._fileobject(self.request, "wb", self.wbufsize)

    def do_write(self):

        import OpenSSL

        try:

            _httprequesthandler.do_write(self)

        except OpenSSL.SSL.SysCallError, inst:

            if inst.args[0] != errno.EPIPE:

                raise

    def handle_one_request(self):

        import OpenSSL

        try:

            _httprequesthandler.handle_one_request(self)

        except (OpenSSL.SSL.SysCallError, OpenSSL.SSL.ZeroReturnError):

            self.close_connection = True

            pass

class _httprequesthandlerssl(_httprequesthandler):

    """HTTPS handler based on Pythons ssl module (introduced in 2.6)"""

    url_scheme = 'https'

    @staticmethod

    def preparehttpserver(httpserver, ssl_cert):

        try:

            import ssl

            ssl.wrap_socket

        except ImportError:

            raise util.Abort(_("SSL support is unavailable"))

        httpserver.socket = ssl.wrap_socket(httpserver.socket, server_side=True,

            certfile=ssl_cert, ssl_version=ssl.PROTOCOL_SSLv23)

    def setup(self):

        self.connection = self.request

        self.rfile = socket._fileobject(self.request, "rb", self.rbufsize)

        self.wfile = socket._fileobject(self.request, "wb", self.wbufsize)

try:

    from threading import activeCount

    _mixin = SocketServer.ThreadingMixIn

except ImportError:

    if hasattr(os, "fork"):

        _mixin = SocketServer.ForkingMixIn

    else:

        class _mixin:

            pass

def openlog(opt, default):

    if opt and opt != '-':

        return open(opt, 'a')

    return default

class MercurialHTTPServer(object, _mixin, BaseHTTPServer.HTTPServer):

    # SO_REUSEADDR has broken semantics on windows

    if os.name == 'nt':

        allow_reuse_address = 0

    def __init__(self, ui, app, addr, handler, **kwargs):

        BaseHTTPServer.HTTPServer.__init__(self, addr, handler, **kwargs)

        self.daemon_threads = True

        self.application = app

        handler.preparehttpserver(self, ui.config('web', 'certificate'))

        prefix = ui.config('web', 'prefix', '')

        if prefix:

            prefix = '/' + prefix.strip('/')

        self.prefix = prefix

        alog = openlog(ui.config('web', 'accesslog', '-'), sys.stdout)

        elog = openlog(ui.config('web', 'errorlog', '-'), sys.stderr)

        self.accesslog = alog

        self.errorlog = elog

        self.addr, self.port = self.socket.getsockname()[0:2]

        self.fqaddr = socket.getfqdn(addr[0])

class IPv6HTTPServer(MercurialHTTPServer):

    address_family = getattr(socket, 'AF_INET6', None)

    def __init__(self, *args, **kwargs):

        if self.address_family is None:

            raise error.RepoError(_('IPv6 is not available on this system'))

        super(IPv6HTTPServer, self).__init__(*args, **kwargs)

def create_server(ui, app):

    if ui.config('web', 'certificate'):

        if sys.version_info >= (2, 6):

            handler = _httprequesthandlerssl

        else:

            handler = _httprequesthandleropenssl

    else:

        handler = _httprequesthandler

    if ui.configbool('web', 'ipv6'):

        cls = IPv6HTTPServer

    else:

        cls = MercurialHTTPServer

    # ugly hack due to python issue5853 (for threaded use)

    import mimetypes; mimetypes.init()

    address = ui.config('web', 'address', '')

    port = util.getport(ui.config('web', 'port', 8000))

    try:

        return cls(ui, app, (address, port), handler)

    except socket.error, inst:

        raise util.Abort(_("cannot start server at '%s:%d': %s")

                         % (address, port, inst.args[1]))