[doc] Splits initial set-up section in two sections => re-order part III.
"""abstract class for http request
:organization: Logilab
:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
"""
__docformat__ = "restructuredtext en"
import Cookie
import sha
import time
import random
import base64
from urlparse import urlsplit
from itertools import count
from rql.utils import rqlvar_maker
from logilab.common.decorators import cached
# XXX move _MARKER here once AppObject.external_resource has been removed
from cubicweb.dbapi import DBAPIRequest
from cubicweb.common.appobject import _MARKER
from cubicweb.common.mail import header
from cubicweb.common.uilib import remove_html_tags
from cubicweb.common.utils import SizeConstrainedList, HTMLHead
from cubicweb.web import (INTERNAL_FIELD_VALUE, LOGGER, NothingToEdit, RequestError,
StatusResponse)
def list_form_param(form, param, pop=False):
"""get param from form parameters and return its value as a list,
skipping internal markers if any
* if the parameter isn't defined, return an empty list
* if the parameter is a single (unicode) value, return a list
containing that value
* if the parameter is already a list or tuple, just skip internal
markers
if pop is True, the parameter is removed from the form dictionnary
"""
if pop:
try:
value = form.pop(param)
except KeyError:
return []
else:
value = form.get(param, ())
if value is None:
value = ()
elif not isinstance(value, (list, tuple)):
value = [value]
return [v for v in value if v != INTERNAL_FIELD_VALUE]
class CubicWebRequestBase(DBAPIRequest):
"""abstract HTTP request, should be extended according to the HTTP backend"""
def __init__(self, vreg, https, form=None):
super(CubicWebRequestBase, self).__init__(vreg)
self.message = None
self.authmode = vreg.config['auth-mode']
self.https = https
# raw html headers that can be added from any view
self.html_headers = HTMLHead()
# form parameters
self.setup_params(form)
# dictionnary that may be used to store request data that has to be
# shared among various components used to publish the request (views,
# controller, application...)
self.data = {}
# search state: 'normal' or 'linksearch' (eg searching for an object
# to create a relation with another)
self.search_state = ('normal',)
# tabindex generator
self.tabindexgen = count()
self.next_tabindex = self.tabindexgen.next
# page id, set by htmlheader template
self.pageid = None
self.varmaker = rqlvar_maker()
self.datadir_url = self._datadir_url()
def set_connection(self, cnx, user=None):
"""method called by the session handler when the user is authenticated
or an anonymous connection is open
"""
super(CubicWebRequestBase, self).set_connection(cnx, user)
# get request language:
vreg = self.vreg
if self.user:
try:
# 1. user specified language
lang = vreg.typed_value('ui.language',
self.user.properties['ui.language'])
self.set_language(lang)
return
except KeyError, ex:
pass
if vreg.config['language-negociation']:
# 2. http negociated language
for lang in self.header_accept_language():
if lang in self.translations:
self.set_language(lang)
return
# 3. default language
self.set_default_language(vreg)
def set_language(self, lang):
self._ = self.__ = self.translations[lang]
self.lang = lang
self.debug('request language: %s', lang)
# input form parameters management ########################################
# common form parameters which should be protected against html values
# XXX can't add 'eid' for instance since it may be multivalued
# dont put rql as well, if query contains < and > it will be corrupted!
no_script_form_params = set(('vid',
'etype',
'vtitle', 'title',
'__message',
'__redirectvid', '__redirectrql'))
def setup_params(self, params):
"""WARNING: we're intentionaly leaving INTERNAL_FIELD_VALUE here
subclasses should overrides to
"""
if params is None:
params = {}
self.form = params
encoding = self.encoding
for k, v in params.items():
if isinstance(v, (tuple, list)):
v = [unicode(x, encoding) for x in v]
if len(v) == 1:
v = v[0]
if k in self.no_script_form_params:
v = self.no_script_form_param(k, value=v)
if isinstance(v, str):
v = unicode(v, encoding)
if k == '__message':
self.set_message(v)
del self.form[k]
else:
self.form[k] = v
def no_script_form_param(self, param, default=None, value=None):
"""ensure there is no script in a user form param
by default return a cleaned string instead of raising a security
exception
this method should be called on every user input (form at least) fields
that are at some point inserted in a generated html page to protect
against script kiddies
"""
if value is None:
value = self.form.get(param, default)
if not value is default and value:
# safety belt for strange urls like http://...?vtitle=yo&vtitle=yo
if isinstance(value, (list, tuple)):
self.error('no_script_form_param got a list (%s). Who generated the URL ?',
repr(value))
value = value[0]
return remove_html_tags(value)
return value
def list_form_param(self, param, form=None, pop=False):
"""get param from form parameters and return its value as a list,
skipping internal markers if any
* if the parameter isn't defined, return an empty list
* if the parameter is a single (unicode) value, return a list
containing that value
* if the parameter is already a list or tuple, just skip internal
markers
if pop is True, the parameter is removed from the form dictionnary
"""
if form is None:
form = self.form
return list_form_param(form, param, pop)
def reset_headers(self):
"""used by AutomaticWebTest to clear html headers between tests on
the same resultset
"""
self.html_headers = HTMLHead()
return self
# web state helpers #######################################################
def set_message(self, msg):
assert isinstance(msg, unicode)
self.message = msg
def update_search_state(self):
"""update the current search state"""
searchstate = self.form.get('__mode')
if not searchstate and self.cnx is not None:
searchstate = self.get_session_data('search_state', 'normal')
self.set_search_state(searchstate)
def set_search_state(self, searchstate):
"""set a new search state"""
if searchstate is None or searchstate == 'normal':
self.search_state = (searchstate or 'normal',)
else:
self.search_state = ('linksearch', searchstate.split(':'))
assert len(self.search_state[-1]) == 4
if self.cnx is not None:
self.set_session_data('search_state', searchstate)
def update_breadcrumbs(self):
"""stores the last visisted page in session data"""
searchstate = self.get_session_data('search_state')
if searchstate == 'normal':
breadcrumbs = self.get_session_data('breadcrumbs', None)
if breadcrumbs is None:
breadcrumbs = SizeConstrainedList(10)
self.set_session_data('breadcrumbs', breadcrumbs)
breadcrumbs.append(self.url())
def last_visited_page(self):
breadcrumbs = self.get_session_data('breadcrumbs', None)
if breadcrumbs:
return breadcrumbs.pop()
return self.base_url()
def register_onetime_callback(self, func, *args):
cbname = 'cb_%s' % (
sha.sha('%s%s%s%s' % (time.time(), func.__name__,
random.random(),
self.user.login)).hexdigest())
def _cb(req):
try:
ret = func(req, *args)
except TypeError:
from warnings import warn
warn('user callback should now take request as argument')
ret = func(*args)
self.unregister_callback(self.pageid, cbname)
return ret
self.set_page_data(cbname, _cb)
return cbname
def unregister_callback(self, pageid, cbname):
assert pageid is not None
assert cbname.startswith('cb_')
self.info('unregistering callback %s for pageid %s', cbname, pageid)
self.del_page_data(cbname)
def clear_user_callbacks(self):
if self.cnx is not None:
sessdata = self.session_data()
callbacks = [key for key in sessdata if key.startswith('cb_')]
for callback in callbacks:
self.del_session_data(callback)
# web edition helpers #####################################################
@cached # so it's writed only once
def fckeditor_config(self):
self.html_headers.define_var('fcklang', self.lang)
self.html_headers.define_var('fckconfigpath',
self.build_url('data/fckcwconfig.js'))
def edited_eids(self, withtype=False):
"""return a list of edited eids"""
yielded = False
# warning: use .keys since the caller may change `form`
form = self.form
try:
eids = form['eid']
except KeyError:
raise NothingToEdit(None, {None: self._('no selected entities')})
if isinstance(eids, basestring):
eids = (eids,)
for peid in eids:
if withtype:
typekey = '__type:%s' % peid
assert typekey in form, 'no entity type specified'
yield peid, form[typekey]
else:
yield peid
yielded = True
if not yielded:
raise NothingToEdit(None, {None: self._('no selected entities')})
# minparams=3 by default: at least eid, __type, and some params to change
def extract_entity_params(self, eid, minparams=3):
"""extract form parameters relative to the given eid"""
params = {}
eid = str(eid)
form = self.form
for param in form:
try:
name, peid = param.split(':', 1)
except ValueError:
if not param.startswith('__') and param != "eid":
self.warning('param %s mis-formatted', param)
continue
if peid == eid:
value = form[param]
if value == INTERNAL_FIELD_VALUE:
value = None
params[name] = value
params['eid'] = eid
if len(params) < minparams:
print eid, params
raise RequestError(self._('missing parameters for entity %s') % eid)
return params
def get_pending_operations(self, entity, relname, role):
operations = {'insert' : [], 'delete' : []}
for optype in ('insert', 'delete'):
data = self.get_session_data('pending_%s' % optype) or ()
for eidfrom, rel, eidto in data:
if relname == rel:
if role == 'subject' and entity.eid == eidfrom:
operations[optype].append(eidto)
if role == 'object' and entity.eid == eidto:
operations[optype].append(eidfrom)
return operations
def get_pending_inserts(self, eid=None):
"""shortcut to access req's pending_insert entry
This is where are stored relations being added while editing
an entity. This used to be stored in a temporary cookie.
"""
pending = self.get_session_data('pending_insert') or ()
return ['%s:%s:%s' % (subj, rel, obj) for subj, rel, obj in pending
if eid is None or eid in (subj, obj)]
def get_pending_deletes(self, eid=None):
"""shortcut to access req's pending_delete entry
This is where are stored relations being removed while editing
an entity. This used to be stored in a temporary cookie.
"""
pending = self.get_session_data('pending_delete') or ()
return ['%s:%s:%s' % (subj, rel, obj) for subj, rel, obj in pending
if eid is None or eid in (subj, obj)]
def remove_pending_operations(self):
"""shortcut to clear req's pending_{delete,insert} entries
This is needed when the edition is completed (whether it's validated
or cancelled)
"""
self.del_session_data('pending_insert')
self.del_session_data('pending_delete')
def cancel_edition(self, errorurl):
"""remove pending operations and `errorurl`'s specific stored data
"""
self.del_session_data(errorurl)
self.remove_pending_operations()
# high level methods for HTTP headers management ##########################
# must be cached since login/password are popped from the form dictionary
# and this method may be called multiple times during authentication
@cached
def get_authorization(self):
"""Parse and return the Authorization header"""
if self.authmode == "cookie":
try:
user = self.form.pop("__login")
passwd = self.form.pop("__password", '')
return user, passwd.encode('UTF8')
except KeyError:
self.debug('no login/password in form params')
return None, None
else:
return self.header_authorization()
def get_cookie(self):
"""retrieve request cookies, returns an empty cookie if not found"""
try:
return Cookie.SimpleCookie(self.get_header('Cookie'))
except KeyError:
return Cookie.SimpleCookie()
def set_cookie(self, cookie, key, maxage=300):
"""set / update a cookie key
by default, cookie will be available for the next 5 minutes.
Give maxage = None to have a "session" cookie expiring when the
client close its browser
"""
morsel = cookie[key]
if maxage is not None:
morsel['Max-Age'] = maxage
# make sure cookie is set on the correct path
morsel['path'] = self.base_url_path()
self.add_header('Set-Cookie', morsel.OutputString())
def remove_cookie(self, cookie, key):
"""remove a cookie by expiring it"""
morsel = cookie[key]
morsel['Max-Age'] = 0
# The only way to set up cookie age for IE is to use an old "expired"
# syntax. IE doesn't support Max-Age there is no library support for
# managing
# ===> Do _NOT_ comment this line :
morsel['expires'] = 'Thu, 01-Jan-1970 00:00:00 GMT'
self.add_header('Set-Cookie', morsel.OutputString())
def set_content_type(self, content_type, filename=None, encoding=None):
"""set output content type for this request. An optional filename
may be given
"""
if content_type.startswith('text/'):
content_type += ';charset=' + (encoding or self.encoding)
self.set_header('content-type', content_type)
if filename:
if isinstance(filename, unicode):
filename = header(filename).encode()
self.set_header('content-disposition', 'inline; filename=%s'
% filename)
# high level methods for HTML headers management ##########################
def add_js(self, jsfiles, localfile=True):
"""specify a list of JS files to include in the HTML headers
:param jsfiles: a JS filename or a list of JS filenames
:param localfile: if True, the default data dir prefix is added to the
JS filename
"""
if isinstance(jsfiles, basestring):
jsfiles = (jsfiles,)
for jsfile in jsfiles:
if localfile:
jsfile = self.datadir_url + jsfile
self.html_headers.add_js(jsfile)
def add_css(self, cssfiles, media=u'all', localfile=True, ieonly=False):
"""specify a CSS file to include in the HTML headers
:param cssfiles: a CSS filename or a list of CSS filenames
:param media: the CSS's media if necessary
:param localfile: if True, the default data dir prefix is added to the
CSS filename
"""
if isinstance(cssfiles, basestring):
cssfiles = (cssfiles,)
if ieonly:
if self.ie_browser():
add_css = self.html_headers.add_ie_css
else:
return # no need to do anything on non IE browsers
else:
add_css = self.html_headers.add_css
for cssfile in cssfiles:
if localfile:
cssfile = self.datadir_url + cssfile
add_css(cssfile, media)
# urls/path management ####################################################
def url(self, includeparams=True):
"""return currently accessed url"""
return self.base_url() + self.relative_path(includeparams)
def _datadir_url(self):
"""return url of the application's data directory"""
return self.base_url() + 'data%s/' % self.vreg.config.instance_md5_version()
def selected(self, url):
"""return True if the url is equivalent to currently accessed url"""
reqpath = self.relative_path().lower()
baselen = len(self.base_url())
return (reqpath == url[baselen:].lower())
def base_url_prepend_host(self, hostname):
protocol, roothost = urlsplit(self.base_url())[:2]
if roothost.startswith('www.'):
roothost = roothost[4:]
return '%s://%s.%s' % (protocol, hostname, roothost)
def base_url_path(self):
"""returns the absolute path of the base url"""
return urlsplit(self.base_url())[2]
@cached
def from_controller(self):
"""return the id (string) of the controller issuing the request"""
controller = self.relative_path(False).split('/', 1)[0]
registered_controllers = (ctrl.id for ctrl in
self.vreg.registry_objects('controllers'))
if controller in registered_controllers:
return controller
return 'view'
def external_resource(self, rid, default=_MARKER):
"""return a path to an external resource, using its identifier
raise KeyError if the resource is not defined
"""
try:
value = self.vreg.config.ext_resources[rid]
except KeyError:
if default is _MARKER:
raise
return default
if value is None:
return None
baseurl = self.datadir_url[:-1] # remove trailing /
if isinstance(value, list):
return [v.replace('DATADIR', baseurl) for v in value]
return value.replace('DATADIR', baseurl)
external_resource = cached(external_resource, keyarg=1)
def validate_cache(self):
"""raise a `DirectResponse` exception if a cached page along the way
exists and is still usable.
calls the client-dependant implementation of `_validate_cache`
"""
self._validate_cache()
if self.http_method() == 'HEAD':
raise StatusResponse(200, '')
# abstract methods to override according to the web front-end #############
def http_method(self):
"""returns 'POST', 'GET', 'HEAD', etc."""
raise NotImplementedError()
def _validate_cache(self):
"""raise a `DirectResponse` exception if a cached page along the way
exists and is still usable
"""
raise NotImplementedError()
def relative_path(self, includeparams=True):
"""return the normalized path of the request (ie at least relative
to the application's root, but some other normalization may be needed
so that the returned path may be used to compare to generated urls
:param includeparams:
boolean indicating if GET form parameters should be kept in the path
"""
raise NotImplementedError()
def get_header(self, header, default=None):
"""return the value associated with the given input HTTP header,
raise KeyError if the header is not set
"""
raise NotImplementedError()
def set_header(self, header, value):
"""set an output HTTP header"""
raise NotImplementedError()
def add_header(self, header, value):
"""add an output HTTP header"""
raise NotImplementedError()
def remove_header(self, header):
"""remove an output HTTP header"""
raise NotImplementedError()
def header_authorization(self):
"""returns a couple (auth-type, auth-value)"""
auth = self.get_header("Authorization", None)
if auth:
scheme, rest = auth.split(' ', 1)
scheme = scheme.lower()
try:
assert scheme == "basic"
user, passwd = base64.decodestring(rest).split(":", 1)
# XXX HTTP header encoding: use email.Header?
return user.decode('UTF8'), passwd
except Exception, ex:
self.debug('bad authorization %s (%s: %s)',
auth, ex.__class__.__name__, ex)
return None, None
def header_accept_language(self):
"""returns an ordered list of preferred languages"""
acceptedlangs = self.get_header('Accept-Language', '')
langs = []
for langinfo in acceptedlangs.split(','):
try:
lang, score = langinfo.split(';')
score = float(score[2:]) # remove 'q='
except ValueError:
lang = langinfo
score = 1.0
lang = lang.split('-')[0]
langs.append( (score, lang) )
langs.sort(reverse=True)
return (lang for (score, lang) in langs)
def header_if_modified_since(self):
"""If the HTTP header If-modified-since is set, return the equivalent
mx date time value (GMT), else return None
"""
raise NotImplementedError()
# page data management ####################################################
def get_page_data(self, key, default=None):
"""return value associated to `key` in curernt page data"""
page_data = self.cnx.get_session_data(self.pageid, {})
return page_data.get(key, default)
def set_page_data(self, key, value):
"""set value associated to `key` in current page data"""
self.html_headers.add_unload_pagedata()
page_data = self.cnx.get_session_data(self.pageid, {})
page_data[key] = value
return self.cnx.set_session_data(self.pageid, page_data)
def del_page_data(self, key=None):
"""remove value associated to `key` in current page data
if `key` is None, all page data will be cleared
"""
if key is None:
self.cnx.del_session_data(self.pageid)
else:
page_data = self.cnx.get_session_data(self.pageid, {})
page_data.pop(key, None)
self.cnx.set_session_data(self.pageid, page_data)
# user-agent detection ####################################################
@cached
def useragent(self):
return self.get_header('User-Agent', None)
def ie_browser(self):
useragent = self.useragent()
return useragent and 'MSIE' in useragent
def xhtml_browser(self):
useragent = self.useragent()
# MSIE does not support xml content-type
# quick fix: Opera supports xhtml and handles namespaces
# properly but it breaks jQuery.attr()
if useragent and ('MSIE' in useragent or 'KHTML' in useragent
or 'Opera' in useragent):
return False
return True
from cubicweb import set_log_methods
set_log_methods(CubicWebRequestBase, LOGGER)