# httprepo.py - HTTP repository proxy classes for mercurial

#

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

# 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, incorporated herein by reference.

from node import bin, hex

from i18n import _

import repo, os, urllib, urllib2, urlparse, zlib, util, httplib

import errno, keepalive, socket, changegroup

class passwordmgr(urllib2.HTTPPasswordMgrWithDefaultRealm):

    def __init__(self, ui):

        urllib2.HTTPPasswordMgrWithDefaultRealm.__init__(self)

        self.ui = ui

    def find_user_password(self, realm, authuri):

        authinfo = urllib2.HTTPPasswordMgrWithDefaultRealm.find_user_password(

            self, realm, authuri)

        user, passwd = authinfo

        if user and passwd:

            return (user, passwd)

        if not self.ui.interactive:

            raise util.Abort(_('http authorization required'))

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

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

        if user:

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

        else:

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

        if not passwd:

            passwd = self.ui.getpass()

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

        return (user, passwd)

def netlocsplit(netloc):

    '''split [user[:passwd]@]host[:port] into 4-tuple.'''

    a = netloc.find('@')

    if a == -1:

        user, passwd = None, None

    else:

        userpass, netloc = netloc[:a], netloc[a+1:]

        c = userpass.find(':')

        if c == -1:

            user, passwd = urllib.unquote(userpass), None

        else:

            user = urllib.unquote(userpass[:c])

            passwd = urllib.unquote(userpass[c+1:])

    c = netloc.find(':')

    if c == -1:

        host, port = netloc, None

    else:

        host, port = netloc[:c], netloc[c+1:]

    return host, port, user, passwd

def netlocunsplit(host, port, user=None, passwd=None):

    '''turn host, port, user, passwd into [user[:passwd]@]host[:port].'''

    if port:

        hostport = host + ':' + port

    else:

        hostport = host

    if user:

        if passwd:

            userpass = urllib.quote(user) + ':' + urllib.quote(passwd)

        else:

            userpass = urllib.quote(user)

        return userpass + '@' + hostport

    return hostport

# work around a bug in Python < 2.4.2

# (it leaves a "\n" at the end of Proxy-authorization headers)

class request(urllib2.Request):

    def add_header(self, key, val):

        if key.lower() == 'proxy-authorization':

            val = val.strip()

        return urllib2.Request.add_header(self, key, val)

class httpsendfile(file):

    def __len__(self):

        return os.fstat(self.fileno()).st_size

def _gen_sendfile(connection):

    def _sendfile(self, data):

        # send a file

        if isinstance(data, httpsendfile):

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

            data.seek(0)

            for chunk in util.filechunkiter(data):

                connection.send(self, chunk)

        else:

            connection.send(self, data)

    return _sendfile

class httpconnection(keepalive.HTTPConnection):

    # must be able to send big bundle as stream.

    send = _gen_sendfile(keepalive.HTTPConnection)

class httphandler(keepalive.HTTPHandler):

    def http_open(self, req):

        return self.do_open(httpconnection, req)

    def __del__(self):

        self.close_all()

has_https = hasattr(urllib2, 'HTTPSHandler')

if has_https:

    class httpsconnection(httplib.HTTPSConnection):

        response_class = keepalive.HTTPResponse

        # must be able to send big bundle as stream.

        send = _gen_sendfile(httplib.HTTPSConnection)

    class httpshandler(keepalive.KeepAliveHandler, urllib2.HTTPSHandler):

        def https_open(self, req):

            return self.do_open(httpsconnection, req)

# In python < 2.5 AbstractDigestAuthHandler raises a ValueError if

# it doesn't know about the auth type requested.  This can happen if

# somebody is using BasicAuth and types a bad password.

class httpdigestauthhandler(urllib2.HTTPDigestAuthHandler):

    def http_error_auth_reqed(self, auth_header, host, req, headers):

        try:

            return urllib2.HTTPDigestAuthHandler.http_error_auth_reqed(

                        self, auth_header, host, req, headers)

        except ValueError, inst:

            arg = inst.args[0]

            if arg.startswith("AbstractDigestAuthHandler doesn't know "):

                return

            raise

def zgenerator(f):

    zd = zlib.decompressobj()

    try:

        for chunk in util.filechunkiter(f):

            yield zd.decompress(chunk)

    except httplib.HTTPException, inst:

        raise IOError(None, _('connection ended unexpectedly'))

    yield zd.flush()

_safe = ('abcdefghijklmnopqrstuvwxyz'

         'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

         '0123456789' '_.-/')

_safeset = None

_hex = None

def quotepath(path):

    '''quote the path part of a URL

    This is similar to urllib.quote, but it also tries to avoid

    quoting things twice (inspired by wget):

    >>> quotepath('abc def')

    'abc%20def'

    >>> quotepath('abc%20def')

    'abc%20def'

    >>> quotepath('abc%20 def')

    'abc%20%20def'

    >>> quotepath('abc def%20')

    'abc%20def%20'

    >>> quotepath('abc def%2')

    'abc%20def%252'

    >>> quotepath('abc def%')

    'abc%20def%25'

    '''

    global _safeset, _hex

    if _safeset is None:

        _safeset = util.set(_safe)

        _hex = util.set('abcdefABCDEF0123456789')

    l = list(path)

    for i in xrange(len(l)):

        c = l[i]

        if c == '%' and i + 2 < len(l) and (l[i+1] in _hex and l[i+2] in _hex):

            pass

        elif c not in _safeset:

            l[i] = '%%%02X' % ord(c)

    return ''.join(l)

class httprepository(repo.repository):

    def __init__(self, ui, path):

        self.path = path

        self.caps = None

        self.handler = None

        scheme, netloc, urlpath, query, frag = urlparse.urlsplit(path)

        if query or frag:

            raise util.Abort(_('unsupported URL component: "%s"') %

                             (query or frag))

        if not urlpath:

            urlpath = '/'

        urlpath = quotepath(urlpath)

        host, port, user, passwd = netlocsplit(netloc)

        # urllib cannot handle URLs with embedded user or passwd

        self._url = urlparse.urlunsplit((scheme, netlocunsplit(host, port),

                                         urlpath, '', ''))

        self.ui = ui

        self.ui.debug(_('using %s\n') % self._url)

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

        # XXX proxyauthinfo = None

        handlers = [httphandler()]

        if has_https:

            handlers.append(httpshandler())

        if proxyurl:

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

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

                    proxyurl.startswith('https:')):

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

            snpqf = urlparse.urlsplit(proxyurl)

            proxyscheme, proxynetloc, proxypath, proxyquery, proxyfrag = snpqf

            hpup = netlocsplit(proxynetloc)

            proxyhost, proxyport, proxyuser, proxypasswd = hpup

            if not proxyuser:

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

                proxypasswd = 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 (not ui.configbool("http_proxy", "always") and

                host.lower() in no_list):

                # avoid auto-detection of proxy settings by appending

                # a ProxyHandler with no proxies defined.

                handlers.append(urllib2.ProxyHandler({}))

                ui.debug(_('disabling proxy for %s\n') % host)

            else:

                proxyurl = urlparse.urlunsplit((

                    proxyscheme, netlocunsplit(proxyhost, proxyport,

                                               proxyuser, proxypasswd or ''),

                    proxypath, proxyquery, proxyfrag))

                handlers.append(urllib2.ProxyHandler({scheme: proxyurl}))

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

                          (proxyhost, proxyport))

        # urllib2 takes proxy values from the environment and those

        # will take precedence if found, so drop them

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

            try:

                if env in os.environ:

                    del os.environ[env]

            except OSError:

                pass

        passmgr = passwordmgr(ui)

        if user:

            ui.debug(_('http auth: user %s, password %s\n') %

                     (user, passwd and '*' * len(passwd) or 'not set'))

            netloc = host

            if port:

                netloc += ':' + port

            # Python < 2.4.3 uses only the netloc to search for a password

            passmgr.add_password(None, (self._url, netloc), user, passwd or '')

        handlers.extend((urllib2.HTTPBasicAuthHandler(passmgr),

                         httpdigestauthhandler(passmgr)))

        opener = urllib2.build_opener(*handlers)

        # 1.0 here is the _protocol_ version

        opener.addheaders = [('User-agent', 'mercurial/proto-1.0')]

        opener.addheaders.append(('Accept', 'application/mercurial-0.1'))

        urllib2.install_opener(opener)

    def url(self):

        return self.path

    # look up capabilities only when needed

    def get_caps(self):

        if self.caps is None:

            try:

                self.caps = util.set(self.do_read('capabilities').split())

            except repo.RepoError:

                self.caps = util.set()

            self.ui.debug(_('capabilities: %s\n') %

                          (' '.join(self.caps or ['none'])))

        return self.caps

    capabilities = property(get_caps)

    def lock(self):

        raise util.Abort(_('operation not supported over http'))

    def do_cmd(self, cmd, **args):

        data = args.pop('data', None)

        headers = args.pop('headers', {})

        self.ui.debug(_("sending %s command\n") % cmd)

        q = {"cmd": cmd}

        q.update(args)

        qs = '?%s' % urllib.urlencode(q)

        cu = "%s%s" % (self._url, qs)

        try:

            if data:

                self.ui.debug(_("sending %s bytes\n") % len(data))

            resp = urllib2.urlopen(request(cu, data, headers))

        except urllib2.HTTPError, inst:

            if inst.code == 401:

                raise util.Abort(_('authorization failed'))

            raise

        except httplib.HTTPException, inst:

            self.ui.debug(_('http error while sending %s command\n') % cmd)

            self.ui.print_exc()

            raise IOError(None, inst)

        except IndexError:

            # this only happens with Python 2.3, later versions raise URLError

            raise util.Abort(_('http error, possibly caused by proxy setting'))

        # record the url we got redirected to

        resp_url = resp.geturl()

        if resp_url.endswith(qs):

            resp_url = resp_url[:-len(qs)]

        if self._url != resp_url:

            self.ui.status(_('real URL is %s\n') % resp_url)

            self._url = resp_url

        try:

            proto = resp.getheader('content-type')

        except AttributeError:

            proto = resp.headers['content-type']

        # accept old "text/plain" and "application/hg-changegroup" for now

        if not (proto.startswith('application/mercurial-') or

                proto.startswith('text/plain') or

                proto.startswith('application/hg-changegroup')):

            self.ui.debug(_("Requested URL: '%s'\n") % cu)

            raise repo.RepoError(_("'%s' does not appear to be an hg repository")

                               % self._url)

        if proto.startswith('application/mercurial-'):

            try:

                version = proto.split('-', 1)[1]

                version_info = tuple([int(n) for n in version.split('.')])

            except ValueError:

                raise repo.RepoError(_("'%s' sent a broken Content-Type "

                                     "header (%s)") % (self._url, proto))

            if version_info > (0, 1):

                raise repo.RepoError(_("'%s' uses newer protocol %s") %

                                   (self._url, version))

        return resp

    def do_read(self, cmd, **args):

        fp = self.do_cmd(cmd, **args)

        try:

            return fp.read()

        finally:

            # if using keepalive, allow connection to be reused

            fp.close()

    def lookup(self, key):

        self.requirecap('lookup', _('look up remote revision'))