# url.py - HTTP handling for mercurial

#

# Copyright 2005, 2006, 2007, 2008 Matt Mackall <mpm@selenic.com>

# Copyright 2006, 2007 Alexis S. L. Carvalho <alexis@cecm.usp.br>

# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>

#

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

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

from __future__ import absolute_import

import base64

import os

import socket

from .i18n import _

from . import (

    error,

    httpconnection as httpconnectionmod,

    keepalive,

    sslutil,

    util,

)

httplib = util.httplib

stringio = util.stringio

urlerr = util.urlerr

urlreq = util.urlreq

class passwordmgr(object):

    def __init__(self, ui, passwddb):

        self.ui = ui

        self.passwddb = passwddb

    def add_password(self, realm, uri, user, passwd):

        return self.passwddb.add_password(realm, uri, user, passwd)

    def find_user_password(self, realm, authuri):

        authinfo = self.passwddb.find_user_password(realm, authuri)

        user, passwd = authinfo

        if user and passwd:

            self._writedebug(user, passwd)

            return (user, passwd)

        if not user or not passwd:

            res = httpconnectionmod.readauthforuri(self.ui, authuri, user)

            if res:

                group, auth = res

                user, passwd = auth.get('username'), auth.get('password')

                self.ui.debug("using auth.%s.* for authentication\n" % group)

        if not user or not passwd:

            u = util.url(authuri)

            u.query = None

            if not self.ui.interactive():

                raise error.Abort(_('http authorization required for %s') %

                                 util.hidepassword(str(u)))

            self.ui.write(_("http authorization required for %s\n") %

                          util.hidepassword(str(u)))

            self.ui.write(_("realm: %s\n") % realm)

            if user:

                self.ui.write(_("user: %s\n") % user)

            else:

                user = self.ui.prompt(_("user:"), default=None)

            if not passwd:

                passwd = self.ui.getpass()

        self.passwddb.add_password(realm, authuri, user, passwd)

        self._writedebug(user, passwd)

        return (user, passwd)

    def _writedebug(self, user, passwd):

        msg = _('http auth: user %s, password %s\n')

        self.ui.debug(msg % (user, passwd and '*' * len(passwd) or 'not set'))

    def find_stored_password(self, authuri):

        return self.passwddb.find_user_password(None, authuri)

class proxyhandler(urlreq.proxyhandler):

    def __init__(self, ui):

        proxyurl = ui.config("http_proxy", "host") or os.getenv('http_proxy')

        # XXX proxyauthinfo = None

        if proxyurl:

            # proxy can be proper url or host[:port]

            if not (proxyurl.startswith('http:') or

                    proxyurl.startswith('https:')):

                proxyurl = 'http://' + proxyurl + '/'

            proxy = util.url(proxyurl)

            if not proxy.user:

                proxy.user = ui.config("http_proxy", "user")

                proxy.passwd = ui.config("http_proxy", "passwd")

            # see if we should use a proxy for this url

            no_list = ["localhost", "127.0.0.1"]

            no_list.extend([p.lower() for

                            p in ui.configlist("http_proxy", "no")])

            no_list.extend([p.strip().lower() for

                            p in os.getenv("no_proxy", '').split(',')

                            if p.strip()])

            # "http_proxy.always" config is for running tests on localhost

            if ui.configbool("http_proxy", "always"):

                self.no_list = []

            else:

                self.no_list = no_list

            proxyurl = str(proxy)

            proxies = {'http': proxyurl, 'https': proxyurl}

            ui.debug('proxying through http://%s:%s\n' %

                      (proxy.host, proxy.port))

        else:

            proxies = {}

        # urllib2 takes proxy values from the environment and those

        # will take precedence if found. So, if there's a config entry

        # defining a proxy, drop the environment ones

        if ui.config("http_proxy", "host"):

            for env in ["HTTP_PROXY", "http_proxy", "no_proxy"]:

                try:

                    if env in os.environ:

                        del os.environ[env]

                except OSError:

                    pass

        urlreq.proxyhandler.__init__(self, proxies)

        self.ui = ui

    def proxy_open(self, req, proxy, type_):

        host = req.get_host().split(':')[0]

        for e in self.no_list:

            if host == e:

                return None

            if e.startswith('*.') and host.endswith(e[2:]):

                return None

            if e.startswith('.') and host.endswith(e[1:]):

                return None

        return urlreq.proxyhandler.proxy_open(self, req, proxy, type_)

def _gen_sendfile(orgsend):

    def _sendfile(self, data):

        # send a file

        if isinstance(data, httpconnectionmod.httpsendfile):

            # if auth required, some data sent twice, so rewind here

            data.seek(0)

            for chunk in util.filechunkiter(data):

                orgsend(self, chunk)

        else:

            orgsend(self, data)

    return _sendfile

has_https = util.safehasattr(urlreq, 'httpshandler')

if has_https:

    try:

        _create_connection = socket.create_connection

    except AttributeError:

        _GLOBAL_DEFAULT_TIMEOUT = object()

        def _create_connection(address, timeout=_GLOBAL_DEFAULT_TIMEOUT,

                               source_address=None):

            # lifted from Python 2.6

            msg = "getaddrinfo returns an empty list"

            host, port = address

            for res in socket.getaddrinfo(host, port, 0, socket.SOCK_STREAM):

                af, socktype, proto, canonname, sa = res

                sock = None

                try:

                    sock = socket.socket(af, socktype, proto)

                    if timeout is not _GLOBAL_DEFAULT_TIMEOUT:

                        sock.settimeout(timeout)

                    if source_address:

                        sock.bind(source_address)

                    sock.connect(sa)

                    return sock

                except socket.error as msg:

                    if sock is not None:

                        sock.close()

            raise socket.error(msg)

class httpconnection(keepalive.HTTPConnection):

    # must be able to send big bundle as stream.

    send = _gen_sendfile(keepalive.HTTPConnection.send)

    def getresponse(self):

        proxyres = getattr(self, 'proxyres', None)

        if proxyres:

            if proxyres.will_close:

                self.close()

            self.proxyres = None

            return proxyres

        return keepalive.HTTPConnection.getresponse(self)

# general transaction handler to support different ways to handle

# HTTPS proxying before and after Python 2.6.3.

def _generic_start_transaction(handler, h, req):

    tunnel_host = getattr(req, '_tunnel_host', None)

    if tunnel_host:

        if tunnel_host[:7] not in ['http://', 'https:/']:

            tunnel_host = 'https://' + tunnel_host

        new_tunnel = True

    else:

        tunnel_host = req.get_selector()

        new_tunnel = False

    if new_tunnel or tunnel_host == req.get_full_url(): # has proxy

        u = util.url(tunnel_host)

        if new_tunnel or u.scheme == 'https': # only use CONNECT for HTTPS

            h.realhostport = ':'.join([u.host, (u.port or '443')])

            h.headers = req.headers.copy()

            h.headers.update(handler.parent.addheaders)

            return

    h.realhostport = None

    h.headers = None

def _generic_proxytunnel(self):

    proxyheaders = dict(

            [(x, self.headers[x]) for x in self.headers

             if x.lower().startswith('proxy-')])

    self.send('CONNECT %s HTTP/1.0\r\n' % self.realhostport)

    for header in proxyheaders.iteritems():

        self.send('%s: %s\r\n' % header)

    self.send('\r\n')

    # majority of the following code is duplicated from

    # httplib.HTTPConnection as there are no adequate places to

    # override functions to provide the needed functionality

    res = self.response_class(self.sock,

                              strict=self.strict,

                              method=self._method)

    while True:

        version, status, reason = res._read_status()

        if status != httplib.CONTINUE:

            break

        while True:

            skip = res.fp.readline().strip()

            if not skip:

                break

    res.status = status

    res.reason = reason.strip()

    if res.status == 200:

        while True:

            line = res.fp.readline()

            if line == '\r\n':

                break

        return True

    if version == 'HTTP/1.0':

        res.version = 10

    elif version.startswith('HTTP/1.'):

        res.version = 11

    elif version == 'HTTP/0.9':

        res.version = 9

    else:

        raise httplib.UnknownProtocol(version)

    if res.version == 9:

        res.length = None

        res.chunked = 0

        res.will_close = 1

        res.msg = httplib.HTTPMessage(stringio())

        return False

    res.msg = httplib.HTTPMessage(res.fp)

    res.msg.fp = None

    # are we using the chunked-style of transfer encoding?

    trenc = res.msg.getheader('transfer-encoding')

    if trenc and trenc.lower() == "chunked":

        res.chunked = 1

        res.chunk_left = None

    else:

        res.chunked = 0

    # will the connection close at the end of the response?

    res.will_close = res._check_close()

    # do we have a Content-Length?

    # NOTE: RFC 2616, section 4.4, #3 says we ignore this if

    # transfer-encoding is "chunked"

    length = res.msg.getheader('content-length')

    if length and not res.chunked:

        try:

            res.length = int(length)

        except ValueError:

            res.length = None

        else:

            if res.length < 0:  # ignore nonsensical negative lengths

                res.length = None

    else:

        res.length = None

    # does the body have a fixed length? (of zero)

    if (status == httplib.NO_CONTENT or status == httplib.NOT_MODIFIED or

        100 <= status < 200 or # 1xx codes

        res._method == 'HEAD'):

        res.length = 0

    # if the connection remains open, and we aren't using chunked, and

    # a content-length was not provided, then assume that the connection

    # WILL close.

    if (not res.will_close and

       not res.chunked and

       res.length is None):

        res.will_close = 1

    self.proxyres = res

    return False

class httphandler(keepalive.HTTPHandler):

    def http_open(self, req):

        return self.do_open(httpconnection, req)

    def _start_transaction(self, h, req):

        _generic_start_transaction(self, h, req)

        return keepalive.HTTPHandler._start_transaction(self, h, req)

if has_https:

    class httpsconnection(httplib.HTTPConnection):

        response_class = keepalive.HTTPResponse

        default_port = httplib.HTTPS_PORT

        # must be able to send big bundle as stream.

        send = _gen_sendfile(keepalive.safesend)

        getresponse = keepalive.wrapgetresponse(httplib.HTTPConnection)

        def __init__(self, host, port=None, key_file=None, cert_file=None,

                     *args, **kwargs):

            httplib.HTTPConnection.__init__(self, host, port, *args, **kwargs)

            self.key_file = key_file

            self.cert_file = cert_file

        def connect(self):

            self.sock = _create_connection((self.host, self.port))

            host = self.host

            if self.realhostport: # use CONNECT proxy

                _generic_proxytunnel(self)

                host = self.realhostport.rsplit(':', 1)[0]

            self.sock = sslutil.wrapsocket(

                self.sock, self.key_file, self.cert_file, ui=self.ui,

                serverhostname=host)

            sslutil.validatesocket(self.sock)

    class httpshandler(keepalive.KeepAliveHandler, urlreq.httpshandler):

        def __init__(self, ui):

            keepalive.KeepAliveHandler.__init__(self)

            urlreq.httpshandler.__init__(self)

            self.ui = ui

            self.pwmgr = passwordmgr(self.ui,

                                     self.ui.httppasswordmgrdb)

        def _start_transaction(self, h, req):

            _generic_start_transaction(self, h, req)

            return keepalive.KeepAliveHandler._start_transaction(self, h, req)

        def https_open(self, req):

            # req.get_full_url() does not contain credentials and we may

            # need them to match the certificates.

            url = req.get_full_url()

            user, password = self.pwmgr.find_stored_password(url)