# httprepo.py - HTTP repository proxy classes for mercurial

#

# Copyright 2005 Matt Mackall <mpm@selenic.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 *

from remoterepo import *

from i18n import gettext as _

from demandload import *

demandload(globals(), "hg os urllib urllib2 urlparse zlib util httplib")

demandload(globals(), "keepalive")

class passwordmgr(urllib2.HTTPPasswordMgr):

    def __init__(self, ui):

        urllib2.HTTPPasswordMgr.__init__(self)

        self.ui = ui

    def find_user_password(self, realm, authuri):

        authinfo = urllib2.HTTPPasswordMgr.find_user_password(

            self, realm, authuri)

        if authinfo != (None, None):

            return authinfo

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

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

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

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

        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 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 = keepalive.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.strip().lower() for

                            p in ui.config("http_proxy", "no", '').split(',')

                            if p.strip()])

            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(_('will use user %s for http auth\n') % user)

            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 = ()

        return self.caps

    capabilities = property(get_caps)

    def dev(self):

        return -1

    def lock(self):

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

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

        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(cu)

        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):

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

class httpsrepository(httprepository):

    pass