//  [python]
def handle_get_token(self, req):
    """Handles the various `request for token and service end point(s)` calls.
    There are various formats to support the various auth servers in the
    past. Examples::

        GET <auth-prefix>/v1/<act>/auth
            X-Auth-User: <act>:<usr>  or  X-Storage-User: <usr>
            X-Auth-Key: <key>         or  X-Storage-Pass: <key>
        GET <auth-prefix>/auth
            X-Auth-User: <act>:<usr>  or  X-Storage-User: <act>:<usr>
            X-Auth-Key: <key>         or  X-Storage-Pass: <key>
        GET <auth-prefix>/v1.0
            X-Auth-User: <act>:<usr>  or  X-Storage-User: <act>:<usr>
            X-Auth-Key: <key>         or  X-Storage-Pass: <key>

    Values should be url encoded, "act%3Ausr" instead of "act:usr" for
    example; however, for backwards compatibility the colon may be included
    unencoded.

    On successful authentication, the response will have X-Auth-Token and
    X-Storage-Token set to the token to use with Swift and X-Storage-URL
    set to the URL to the default Swift cluster to use.

    The response body will be set to the account's services JSON object as
    described here::

        {"storage": {     # Represents the Swift storage service end points
            "default": "cluster1", # Indicates which cluster is the default
            "cluster1": "<URL to use with Swift>",
                # A Swift cluster that can be used with this account,
                # "cluster1" is the name of the cluster which is usually a
                # location indicator (like "dfw" for a datacenter region).
            "cluster2": "<URL to use with Swift>"
                # Another Swift cluster that can be used with this account,
                # there will always be at least one Swift cluster to use or
                # this whole "storage" dict won't be included at all.
         },
         "servers": {       # Represents the Nova server service end points
            # Expected to be similar to the "storage" dict, but not
            # implemented yet.
         },
         # Possibly other service dicts, not implemented yet.
        }

    One can also include an "X-Auth-New-Token: true" header to
    force issuing a new token and revoking any old token, even if
    it hasn't expired yet.

    :param req: The swob.Request to process.
    :returns: swob.Response, 2xx on success with data set as explained
              above.
    """
    # Validate the request info
    try:
        pathsegs = split_path(req.path_info, minsegs=1, maxsegs=3,
                              rest_with_last=True)
    except ValueError:
        return HTTPNotFound(request=req)
    if pathsegs[0] == 'v1' and pathsegs[2] == 'auth':
        account = pathsegs[1]
        user = req.headers.get('x-storage-user')
        if not user:
            user = unquote(req.headers.get('x-auth-user', ''))
            if not user or ':' not in user:
                return HTTPUnauthorized(request=req)
            account2, user = user.split(':', 1)
            if account != account2:
                return HTTPUnauthorized(request=req)
        key = req.headers.get('x-storage-pass')
        if not key:
            key = unquote(req.headers.get('x-auth-key', ''))
    elif pathsegs[0] in ('auth', 'v1.0'):
        user = unquote(req.headers.get('x-auth-user', ''))
        if not user:
            user = req.headers.get('x-storage-user')
        if not user or ':' not in user:
            return HTTPUnauthorized(request=req)
        account, user = user.split(':', 1)
        key = unquote(req.headers.get('x-auth-key', ''))
        if not key:
            key = req.headers.get('x-storage-pass')
    else:
        return HTTPBadRequest(request=req)
    if not all((account, user, key)):
        return HTTPUnauthorized(request=req)
    if user == '.super_admin' and self.super_admin_key and \
            key == self.super_admin_key:
        token = self.get_itoken(req.environ)
        url = '%s/%s.auth' % (self.dsc_url, self.reseller_prefix)
        return Response(
            request=req,
            content_type=CONTENT_TYPE_JSON,
            body=json.dumps({'storage': {'default': 'local',
                                         'local': url}}),
            headers={'x-auth-token': token,
                     'x-storage-token': token,
                     'x-storage-url': url})

    # Authenticate user
    path = quote('/v1/%s/%s/%s' % (self.auth_account, account, user))
    resp = self.make_pre_authed_request(
        req.environ, 'GET', path).get_response(self.app)
    if resp.status_int == 404:
        return HTTPUnauthorized(request=req)
    if resp.status_int // 100 != 2:
        raise Exception('Could not obtain user details: %s %s' %
                        (path, resp.status))
    user_detail = json.loads(resp.body)
    if not self.credentials_match(user_detail, key):
        return HTTPUnauthorized(request=req)
    # See if a token already exists and hasn't expired
    token = None
    expires = None
    candidate_token = resp.headers.get('x-object-meta-auth-token')
    if candidate_token:
        path = quote('/v1/%s/.token_%s/%s' %
            (self.auth_account, candidate_token[-1], candidate_token))
        delete_token = False
        try:
            if req.headers.get('x-auth-new-token', 'false').lower() in \
                    TRUE_VALUES:
                delete_token = True
            else:
                resp = self.make_pre_authed_request(
                    req.environ, 'GET', path).get_response(self.app)
                if resp.status_int // 100 == 2:
                    token_detail = json.loads(resp.body)
                    if token_detail['expires'] > time():
                        token = candidate_token
                        expires = token_detail['expires']
                    else:
                        delete_token = True
                elif resp.status_int != 404:
                    raise Exception(
                        'Could not detect whether a token already exists: '
                        '%s %s' % (path, resp.status))
        finally:
            if delete_token:
                self.make_pre_authed_request(
                    req.environ, 'DELETE', path).get_response(self.app)
                memcache_client = cache_from_env(req.environ)
                if memcache_client:
                    memcache_key = '%s/auth/%s' % (self.reseller_prefix,
                                                   candidate_token)
                    memcache_client.delete(memcache_key)
    # Create a new token if one didn't exist
    if not token:
        # Retrieve account id, we'll save this in the token
        path = quote('/v1/%s/%s' % (self.auth_account, account))
        resp = self.make_pre_authed_request(
            req.environ, 'HEAD', path).get_response(self.app)
        if resp.status_int // 100 != 2:
            raise Exception('Could not retrieve account id value: '
                            '%s %s' % (path, resp.status))
        account_id = \
            resp.headers['x-container-meta-account-id']
        # Generate new token
        token = '%stk%s' % (self.reseller_prefix, uuid4().hex)
        # Save token info
        path = quote('/v1/%s/.token_%s/%s' %
                     (self.auth_account, token[-1], token))
        try:
            token_life = min(
                int(req.headers.get('x-auth-token-lifetime',
                                    self.token_life)),
                self.max_token_life)
        except ValueError:
            token_life = self.token_life
        expires = int(time() + token_life)
        resp = self.make_pre_authed_request(
            req.environ, 'PUT', path,
            json.dumps({'account': account, 'user': user,
            'account_id': account_id,
            'groups': user_detail['groups'],
            'expires': expires})).get_response(self.app)
        if resp.status_int // 100 != 2:
            raise Exception('Could not create new token: %s %s' %
                            (path, resp.status))
        # Record the token with the user info for future use.
        path = quote('/v1/%s/%s/%s' % (self.auth_account, account, user))
        resp = self.make_pre_authed_request(
            req.environ, 'POST', path,
            headers={'X-Object-Meta-Auth-Token': token}
        ).get_response(self.app)
        if resp.status_int // 100 != 2:
            raise Exception('Could not save new token: %s %s' %
                            (path, resp.status))
    # Get the services information
    path = quote('/v1/%s/%s/.services' % (self.auth_account, account))
    resp = self.make_pre_authed_request(
        req.environ, 'GET', path).get_response(self.app)
    if resp.status_int // 100 != 2:
        raise Exception('Could not obtain services info: %s %s' %
                        (path, resp.status))
    detail = json.loads(resp.body)
    url = detail['storage'][detail['storage']['default']]
    return Response(
        request=req,
        body=resp.body,
        content_type=CONTENT_TYPE_JSON,
        headers={'x-auth-token': token,
                 'x-storage-token': token,
                 'x-auth-token-expires': str(int(expires - time())),
                 'x-storage-url': url})