annotate mercurial/httprepo.py @ 2569:52ce0d6bc375

HTTPS: fix python2.3, persistent connections, don't explode if SSL is not available

The urllib2 differences between python 2.3 and 2.4 are hidden by
using keepalive.py, which also gives us support for persistent
connections.

Support for HTTPS is enabled only if there's a HTTPSHandler class in
urllib2.

It's not possible to have separate classes as handlers for HTTP and
HTTPS:  to support persistent HTTPS connections, we need a class that
inherits from both keepalive.HTTPHandler and urllib2.HTTPSHandler.  If
we try to pass (an instance of) this class and (an instance of) the
httphandler class to urllib2.build_opener, this function ends up getting
confused, since both classes are subclasses of the HTTPHandler default
handler, and raises an exception.

# httprepo.py - HTTP repository proxy classes for mercurial
#
# Copyright 2005 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms
# of the GNU General Public License, incorporated herein by reference.

from node import *
from remoterepo import *
from i18n import gettext as _
from demandload import *
demandload(globals(), "hg os urllib urllib2 urlparse zlib util httplib")
demandload(globals(), "errno keepalive tempfile socket")

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

class httpconnection(keepalive.HTTPConnection):
    # must be able to send big bundle as stream.

    def send(self, data):
        if isinstance(data, str):
            keepalive.HTTPConnection.send(self, data)
        else:
            # if auth required, some data sent twice, so rewind here
            data.seek(0)
            for chunk in util.filechunkiter(data):
                keepalive.HTTPConnection.send(self, chunk)

class basehttphandler(keepalive.HTTPHandler):
    def http_open(self, req):
        return self.do_open(httpconnection, req)

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.

        def send(self, data):
            if isinstance(data, str):
                httplib.HTTPSConnection.send(self, data)
            else:
                # if auth required, some data sent twice, so rewind here
                data.seek(0)
                for chunk in util.filechunkiter(data):
                    httplib.HTTPSConnection.send(self, chunk)

    class httphandler(basehttphandler, urllib2.HTTPSHandler):
        def https_open(self, req):
            return self.do_open(httpsconnection, req)
else:
    class httphandler(basehttphandler):
        pass

class httprepository(remoterepository):
    def __init__(self, ui, path):
        self.caps = 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 = '/'
        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

        proxyurl = ui.config("http_proxy", "host") or os.getenv('http_proxy')
        proxyauthinfo = None
        handler = httphandler()

        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):
                ui.debug(_('disabling proxy for %s\n') % host)
            else:
                proxyurl = urlparse.urlunsplit((
                    proxyscheme, netlocunsplit(proxyhost, proxyport,
                                               proxyuser, proxypasswd or ''),
                    proxypath, proxyquery, proxyfrag))
                handler = urllib2.ProxyHandler({scheme: proxyurl})
                ui.debug(_('proxying through %s\n') % proxyurl)

        # 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 os.environ.has_key(env):
                    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'))
            passmgr.add_password(None, host, user, passwd or '')

        opener = urllib2.build_opener(
            handler,
            urllib2.HTTPBasicAuthHandler(passmgr),
            urllib2.HTTPDigestAuthHandler(passmgr))

        # 1.0 here is the _protocol_ version
        opener.addheaders = [('User-agent', 'mercurial/proto-1.0')]
        urllib2.install_opener(opener)

    # look up capabilities only when needed

    def get_caps(self):
        if self.caps is None:
            try:
                self.caps = self.do_read('capabilities').split()
            except hg.RepoError:
                self.caps = ()
            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 = urllib.urlencode(q)
        cu = "%s?%s" % (self.url, qs)
        try:
            resp = urllib2.urlopen(urllib2.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)
        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') and \
               not proto.startswith('text/plain') and \
               not proto.startswith('application/hg-changegroup'):
            raise hg.RepoError(_("'%s' does not appear to be an hg repository") %
                               self.url)

        if proto.startswith('application/mercurial'):
            version = proto[22:]
            if float(version) > 0.1:
                raise hg.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 heads(self):
        d = self.do_read("heads")
        try:
            return map(bin, d[:-1].split(" "))
        except:
            self.ui.warn(_("unexpected response:\n") + d[:400] + "\n...\n")
            raise

    def branches(self, nodes):
        n = " ".join(map(hex, nodes))
        d = self.do_read("branches", nodes=n)
        try:
            br = [ tuple(map(bin, b.split(" "))) for b in d.splitlines() ]
            return br
        except:
            self.ui.warn(_("unexpected response:\n") + d[:400] + "\n...\n")
            raise

    def between(self, pairs):
        n = "\n".join(["-".join(map(hex, p)) for p in pairs])
        d = self.do_read("between", pairs=n)
        try:
            p = [ l and map(bin, l.split(" ")) or [] for l in d.splitlines() ]
            return p
        except:
            self.ui.warn(_("unexpected response:\n") + d[:400] + "\n...\n")
            raise

    def changegroup(self, nodes, kind):
        n = " ".join(map(hex, nodes))
        f = self.do_cmd("changegroup", roots=n)
        bytes = 0

        def zgenerator(f):
            zd = zlib.decompressobj()
            try:
                for chnk in f:
                    yield zd.decompress(chnk)
            except httplib.HTTPException, inst:
                raise IOError(None, _('connection ended unexpectedly'))
            yield zd.flush()

        return util.chunkbuffer(zgenerator(util.filechunkiter(f)))

    def unbundle(self, cg, heads, source):
        # have to stream bundle to a temp file because we do not have
        # http 1.1 chunked transfer.

        fd, tempname = tempfile.mkstemp(prefix='hg-unbundle-')
        fp = os.fdopen(fd, 'wb+')
        try:
            for chunk in util.filechunkiter(cg):
                fp.write(chunk)
            length = fp.tell()
            try:
                rfp = self.do_cmd(
                    'unbundle', data=fp,
                    headers={'content-length': length,
                             'content-type': 'application/octet-stream'},
                    heads=' '.join(map(hex, heads)))
                try:
                    ret = int(rfp.readline())
                    self.ui.write(rfp.read())
                    return ret
                finally:
                    rfp.close()
            except socket.error, err:
                if err[0] in (errno.ECONNRESET, errno.EPIPE):
                    raise util.Abort(_('push failed: %s'), err[1])
                raise util.Abort(err[1])
        finally:
            fp.close()
            os.unlink(tempname)

class httpsrepository(httprepository):
    def __init__(self, ui, path):
        if not has_https:
            raise util.Abort(_('Python support for SSL and HTTPS '
                               'is not installed'))
        httprepository.__init__(self, ui, path)