# httpconnection.py - urllib2 handler for new http support

#

# 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>

# Copyright 2011 Google, Inc.

#

# 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 logging

import os

import socket

from .i18n import _

from . import (

    httpclient,

    sslutil,

    util,

)

urlerr = util.urlerr

urlreq = util.urlreq

# moved here from url.py to avoid a cycle

class httpsendfile(object):

    """This is a wrapper around the objects returned by python's "open".

    Its purpose is to send file-like objects via HTTP.

    It do however not define a __len__ attribute because the length

    might be more than Py_ssize_t can handle.

    """

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

        self.ui = ui

        self._data = open(*args, **kwargs)

        self.seek = self._data.seek

        self.close = self._data.close

        self.write = self._data.write

        self.length = os.fstat(self._data.fileno()).st_size

        self._pos = 0

        self._total = self.length // 1024 * 2

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

        try:

            ret = self._data.read(*args, **kwargs)

        except EOFError:

            self.ui.progress(_('sending'), None)

        self._pos += len(ret)

        # We pass double the max for total because we currently have

        # to send the bundle twice in the case of a server that

        # requires authentication. Since we can't know until we try

        # once whether authentication will be required, just lie to

        # the user and maybe the push succeeds suddenly at 50%.

        self.ui.progress(_('sending'), self._pos // 1024,

                         unit=_('kb'), total=self._total)

        return ret

    def __enter__(self):

        return self

    def __exit__(self, exc_type, exc_val, exc_tb):

        self.close()

# moved here from url.py to avoid a cycle

def readauthforuri(ui, uri, user):

    # Read configuration

    config = dict()

    for key, val in ui.configitems('auth'):

        if '.' not in key:

            ui.warn(_("ignoring invalid [auth] key '%s'\n") % key)

            continue

        group, setting = key.rsplit('.', 1)

        gdict = config.setdefault(group, dict())

        if setting in ('username', 'cert', 'key'):

            val = util.expandpath(val)

        gdict[setting] = val

    # Find the best match

    scheme, hostpath = uri.split('://', 1)

    bestuser = None

    bestlen = 0

    bestauth = None

    for group, auth in config.iteritems():

        if user and user != auth.get('username', user):

            # If a username was set in the URI, the entry username

            # must either match it or be unset

            continue

        prefix = auth.get('prefix')

        if not prefix:

            continue

        p = prefix.split('://', 1)

        if len(p) > 1:

            schemes, prefix = [p[0]], p[1]

        else:

            schemes = (auth.get('schemes') or 'https').split()

        if (prefix == '*' or hostpath.startswith(prefix)) and \

            (len(prefix) > bestlen or (len(prefix) == bestlen and \

                not bestuser and 'username' in auth)) \

             and scheme in schemes:

            bestlen = len(prefix)

            bestauth = group, auth

            bestuser = auth.get('username')

            if user and not bestuser:

                auth['username'] = user

    return bestauth

# Mercurial (at least until we can remove the old codepath) requires

# that the http response object be sufficiently file-like, so we

# provide a close() method here.

class HTTPResponse(httpclient.HTTPResponse):

    def close(self):

        pass

class HTTPConnection(httpclient.HTTPConnection):

    response_class = HTTPResponse

    def request(self, method, uri, body=None, headers=None):

        if headers is None:

            headers = {}

        if isinstance(body, httpsendfile):

            body.seek(0)

        httpclient.HTTPConnection.request(self, method, uri, body=body,

                                          headers=headers)

_configuredlogging = False

LOGFMT = '%(levelname)s:%(name)s:%(lineno)d:%(message)s'

# Subclass BOTH of these because otherwise urllib2 "helpfully"

# reinserts them since it notices we don't include any subclasses of

# them.

class http2handler(urlreq.httphandler, urlreq.httpshandler):

    def __init__(self, ui, pwmgr):

        global _configuredlogging

        urlreq.abstracthttphandler.__init__(self)

        self.ui = ui

        self.pwmgr = pwmgr

        self._connections = {}

        # developer config: ui.http2debuglevel

        loglevel = ui.config('ui', 'http2debuglevel', default=None)

        if loglevel and not _configuredlogging:

            _configuredlogging = True

            logger = logging.getLogger('mercurial.httpclient')

            logger.setLevel(getattr(logging, loglevel.upper()))

            handler = logging.StreamHandler()

            handler.setFormatter(logging.Formatter(LOGFMT))

            logger.addHandler(handler)

    def close_all(self):

        """Close and remove all connection objects being kept for reuse."""

        for openconns in self._connections.values():

            for conn in openconns:

                conn.close()

        self._connections = {}

    # shamelessly borrowed from urllib2.AbstractHTTPHandler

    def do_open(self, http_class, req, use_ssl):

        """Return an addinfourl object for the request, using http_class.

        http_class must implement the HTTPConnection API from httplib.

        The addinfourl return value is a file-like object.  It also

        has methods and attributes including:

            - info(): return a mimetools.Message object for the headers

            - geturl(): return the original request URL

            - code: HTTP status code

        """

        # If using a proxy, the host returned by get_host() is

        # actually the proxy. On Python 2.6.1, the real destination

        # hostname is encoded in the URI in the urllib2 request

        # object. On Python 2.6.5, it's stored in the _tunnel_host

        # attribute which has no accessor.

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

        host = req.get_host()

        if tunhost:

            proxyhost = host

            host = tunhost

        elif req.has_proxy():

            proxyhost = req.get_host()

            host = req.get_selector().split('://', 1)[1].split('/', 1)[0]

        else:

            proxyhost = None

        if proxyhost:

            if ':' in proxyhost:

                # Note: this means we'll explode if we try and use an

                # IPv6 http proxy. This isn't a regression, so we

                # won't worry about it for now.

                proxyhost, proxyport = proxyhost.rsplit(':', 1)

            else:

                proxyport = 3128 # squid default

            proxy = (proxyhost, proxyport)

        else:

            proxy = None

        if not host:

            raise urlerr.urlerror('no host given')

        connkey = use_ssl, host, proxy

        allconns = self._connections.get(connkey, [])

        conns = [c for c in allconns if not c.busy()]

        if conns:

            h = conns[0]

        else:

            if allconns:

                self.ui.debug('all connections for %s busy, making a new '

                              'one\n' % host)

            timeout = None

            if req.timeout is not socket._GLOBAL_DEFAULT_TIMEOUT:

                timeout = req.timeout

            h = http_class(host, timeout=timeout, proxy_hostport=proxy)

            self._connections.setdefault(connkey, []).append(h)

        headers = dict(req.headers)

        headers.update(req.unredirected_hdrs)

        headers = dict(

            (name.title(), val) for name, val in headers.items())

        try:

            path = req.get_selector()

            if '://' in path:

                path = path.split('://', 1)[1].split('/', 1)[1]

            if path[0] != '/':

                path = '/' + path

            h.request(req.get_method(), path, req.data, headers)

            r = h.getresponse()

        except socket.error as err: # XXX what error?

            raise urlerr.urlerror(err)

        # Pick apart the HTTPResponse object to get the addinfourl

        # object initialized properly.

        r.recv = r.read

        resp = urlreq.addinfourl(r, r.headers, req.get_full_url())

        resp.code = r.status

        resp.msg = r.reason

        return resp

    # httplib always uses the given host/port as the socket connect

    # target, and then allows full URIs in the request path, which it

    # then observes and treats as a signal to do proxying instead.

    def http_open(self, req):

        if req.get_full_url().startswith('https'):

            return self.https_open(req)

        def makehttpcon(*args, **kwargs):

            k2 = dict(kwargs)

            k2['use_ssl'] = False

            return HTTPConnection(*args, **k2)

        return self.do_open(makehttpcon, req, False)

    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)

        res = readauthforuri(self.ui, url, user)

        if res:

            group, auth = res

            self.auth = auth

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

        else:

            self.auth = None

        return self.do_open(self._makesslconnection, req, True)

    def _makesslconnection(self, host, port=443, *args, **kwargs):

        keyfile = None

        certfile = None

        if args: # key_file

            keyfile = args.pop(0)

        if args: # cert_file

            certfile = args.pop(0)

        # if the user has specified different key/cert files in

        # hgrc, we prefer these

        if self.auth and 'key' in self.auth and 'cert' in self.auth:

            keyfile = self.auth['key']

            certfile = self.auth['cert']

        # let host port take precedence

        if ':' in host and '[' not in host or ']:' in host:

            host, port = host.rsplit(':', 1)

            port = int(port)

            if '[' in host:

                host = host[1:-1]

        kwargs['keyfile'] = keyfile

        kwargs['certfile'] = certfile

        con = HTTPConnection(host, port, use_ssl=True,

                             ssl_wrap_socket=sslutil.wrapsocket,

                             ssl_validator=sslutil.validatesocket,

                             ui=self.ui,

                             **kwargs)

        return con