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#
# Copyright 2006 sense.lab e.V.
#
# This file is part of the CryptoBox.
#
# The CryptoBox is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# The CryptoBox is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the CryptoBox; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
""" this module handles all http requests and renders a website """
__revision__ = "$Id$"
import cryptobox.core.main
import cryptobox.web.dataset
import cryptobox.plugins.manage
import cryptobox.core.exceptions
import re
import cherrypy
import os
import sys
try:
import neo_cgi, neo_util, neo_cs
except ImportError:
_ERRMSG = "Could not import clearsilver module. \
Try 'apt-get install python-clearsilver'."
sys.stderr.write(_ERRMSG)
raise ImportError, _ERRMSG
GETTEXT_DOMAIN = 'cryptobox-server'
class PluginIconHandler:
"""deliver the icons of available plugins via cherrypy"""
def __init__(self, plugins):
for plugin in plugins.get_plugins():
if not plugin:
continue
plname = plugin.get_name()
## expose the get_icon function of this plugin
setattr(self, plname, plugin.get_icon)
class WebInterfaceSites:
"""handle all http requests and render pages
this includes:
- filtering common arguments
- calling feature actions
- translating content
all available features are dynamically exposed
"""
## this template is used under strange circumstances
defaultTemplate = "empty"
def __init__(self, conf_file=None):
## we should only use variables preceded by "__" to avoid name conflicts
## when loading features
self.cbox = cryptobox.core.main.CryptoBox(conf_file)
self.__cached_language_data = None
self.__dataset = None
self.icons = None
self.__plugin_manager = None
self.__reset_dataset()
## store the original http error handler
self._cp_on_http_error = self.new_http_error_handler
## set initial language order
self.lang_order = self.cbox.prefs["WebSettings"]["Languages"][:]
self.setup()
def setup(self):
"""Prepare the webinterface.
"""
self.cbox.setup()
for plugin in self.__plugin_manager.get_plugins():
if plugin:
plugin.setup()
def cleanup(self):
"""Shutdown the webinterface safely.
"""
for plugin in self.__plugin_manager.get_plugins():
if plugin:
plugin.cleanup()
self.cbox.cleanup()
def __reset_dataset(self):
"""this method has to be called at the beginning of every "site" action
important: only at the beginning of an action (to not loose information)
important: for _every_ "site" action (cherrypy is stateful)
also take care for the plugins, as they also contain datasets
"""
self.__load_plugins()
self.__dataset = cryptobox.web.dataset.WebInterfaceDataset(
self.cbox, self.cbox.prefs, self.__plugin_manager.get_plugins())
## publish plugin icons
self.icons = PluginIconHandler(self.__plugin_manager)
self.icons.exposed = True
## check, if a configuration partition has become available
self.cbox.prefs.prepare_partition()
def __load_plugins(self):
"""reinitialize the list of available plugins
this includes the following:
- reload all plugins and check their state (disabled or not)
- reinitilize the datasets of all plugins
"""
self.__plugin_manager = cryptobox.plugins.manage.PluginManager(
self.cbox, self.cbox.prefs["Locations"]["PluginDir"], self)
for plugin in self.__plugin_manager.get_plugins():
if not plugin:
continue
plname = plugin.get_name()
## check if there are name conflicts: e.g. a local variable has the
## same name as a plugin to be loaded -> skip these plugins
## if we do not check this here, nasty side effects may occour ...
try:
prev_obj = getattr(self, plname)
if not callable(prev_obj) \
or not prev_obj.exposed:
self.cbox.log.error("Skipped feature (%s) as its name"
+ " conflicts with a local variable - see"
+ " module cryptobox.web.sites" % plname)
## skip this plugin
continue
except (NameError, AttributeError):
## an attribute with the same name does not exist -> ok
if plugin.is_enabled():
self.cbox.log.info("Plugin '%s' loaded" % plname)
## expose all features as URLs
setattr(self, plname, self.return_plugin_action(plugin))
getattr(self, plname).exposed = True
#TODO: check, if this really works
#for now the "stream_response" feature seems to be broken
#setattr(getattr(self, plname), "stream_respones", True)
else:
self.cbox.log.info("Plugin '%s' is disabled" % plname)
## remove the plugin, if it was active before
setattr(self, plname, None)
## sub pages requiring authentication may not be defined above
def __request_auth(self=None):
""" this is a function decorator to check authentication
"""
def check_credentials(site):
""" see description of _inner_wrapper - please simplify this!
"""
def _inner_wrapper(self, *args, **kargs):
"""this function was necessary while trying around with the
function decorator - if someone can implement the decorator
with less effort, then any suggestions are welcome!
"""
import base64
## define a "non-allowed" function
user, password = None, None
try:
## ignore the "Basic " (first six letters) part
resp = cherrypy.request.headers["Authorization"][6:]
(user, password) = base64.b64decode(resp).split(":", 1)
except KeyError:
## no "authorization" header was sent
pass
except TypeError:
## invalid base64 string
pass
except AttributeError:
## no cherrypy response header defined
pass
auth_dict = self.cbox.prefs.user_db["admins"]
if user in auth_dict.keys():
if self.cbox.prefs.user_db.get_digest(password) == auth_dict[user]:
## ok: return the choosen page
self.cbox.log.info("access granted for: %s" % user)
return site(self, *args, **kargs)
else:
self.cbox.log.info(
"wrong password supplied for: %s" % user)
else:
self.cbox.log.info("unknown user: %s" % str(user))
## wrong credentials: return "access denied"
cherrypy.response.headers["WWW-Authenticate"] = \
'''Basic realm="CryptoBox"'''
cherrypy.response.status = 401
return self.__render("access_denied")
return _inner_wrapper
return check_credentials
######################################################################
## put real sites down here and don't forget to expose them at the end
@cherrypy.expose
def index(self, weblang="", help="0", device=None):
"""the default page on startup - we show the list of available disks
"""
self.__reset_dataset()
self.__set_web_lang(weblang)
self.__check_environment()
## do not forget the language!
param_dict = {"weblang":weblang}
## render "disks" plugin by default
return self.return_plugin_action(
self.__plugin_manager.get_plugin("disks"))(**param_dict)
def new_http_error_handler(self, error_code, message):
"""handle http errors gracefully
404 - not found errors: ignored if url is below /cryptobox-misc/
other 404 errors: send the error code and return a nice informative page
500 - runtime errors: return "ok" exit code and show a polite excuse
others: are there any other possible http errors?
"""
import traceback
## we ignore uninteresting not-found errors
if (error_code == 404) and \
(cherrypy.request.path.startswith("/cryptobox-misc/") or \
cherrypy.request.path in ['/robots.txt','/favicon.ico']):
cherrypy.response.status = error_code
return
## an invalid action was requested
if error_code == 404:
## we send a not-found error (with the usual interface)
cherrypy.response.status = error_code
self.__dataset["Data.Warning"] = "InvalidAction"
cherrypy.response.body = self.__render("empty")
return
## are there still bugs in the code?
if error_code == 500:
## we fix the error code (200 is "OK")
cherrypy.response.status = 200
self.cbox.log.error(
"HTTP-ERROR[500] - runtime error: %s" % str(message))
## add a traceback and exception information to the lo
for log_line in traceback.format_exception(*sys.exc_info()):
self.cbox.log.error("\t%s" % log_line)
self.__dataset["Data.Warning"] = "RuntimeError"
cherrypy.response.body = self.__render("empty")
return
## unknown error type
cherrypy.response.status = error_code
self.cbox.log.warn("HTTP-ERROR[%d] - an unknown error occoured: %s" \
% (error_code, message))
cherrypy.response.body = self.__render("empty")
def return_plugin_action(self, plugin):
""" returns a function that is suitable for handling a cherrypy
page request
"""
def handler(self, weblang="", device=None, help="0", redirect=None, message_keep=None, **args):
"""this function handles a cherrypy page request
"""
plugin.reset()
self.__reset_dataset()
self.__check_environment()
self.__set_web_lang(weblang)
## we always read the "device" setting - otherwise volume-plugin
## links would not work easily
## (see "volume_props" linking to "volume_format_fs")
## it will get ignored for non-volume plugins
plugin.device = None
if device and self.__set_device(device):
plugin.device = device
## check the device argument of volume plugins
if "volume" in plugin.plugin_capabilities:
## initialize the dataset of the selected device if necessary
if plugin.device:
self.__dataset.set_current_disk_state(plugin.device)
else:
## invalid (or missing) device setting
return self.__render(self.defaultTemplate)
## check if there is a "redirect" setting - this will override
## the return value of the do_action function
## (e.g. useful for umount-before-format)
override_next_template = None
if redirect:
override_next_template = { "plugin": redirect }
if "volume" in plugin.plugin_capabilities:
override_next_template["values"] = {"device":plugin.device}
## check for information to be kept after the last call
if message_keep:
for (key, value) in message_keep["dataset"].items():
self.__dataset[key] = value
## check if the device is busy
if plugin.device and self.cbox.get_container(plugin.device).is_busy():
return self.__render("volume_busy")
## call the plugin handler
next_template = plugin.do_action(**args)
## for 'volume' plugins: reread the dataset of the current disk
## additionally: set the default template for plugins
if "volume" in plugin.plugin_capabilities:
## maybe the state of the current volume was changed?
self.__dataset.set_current_disk_state(plugin.device)
if not next_template:
next_template = { "plugin":"volume_mount",
"values":{"device":plugin.device}}
else:
## some non-volume plugins change the internal state of other
## plugins - e.g.: plugin_manager
self.__dataset.set_plugin_data()
## default page for non-volume plugins is the disk selection
if not next_template:
next_template = { "plugin":"disks", "values":{} }
## some non-volume plugins may change the state of containers
## the mount plugin may change the number of active disks - for the logo
self.__dataset.set_containers_state()
## was a redirect requested?
if override_next_template:
next_template = override_next_template
## if another plugins was choosen for 'next_template', then do it!
if isinstance(next_template, dict) \
and "plugin" in next_template.keys() \
and "values" in next_template.keys() \
and self.__plugin_manager.get_plugin(next_template["plugin"]):
value_dict = dict(next_template["values"])
## force the current weblang attribute - otherwise it gets lost
value_dict["weblang"] = self.lang_order[0]
## check for warnings/success messages, that should be kept
if "Data.Success" in plugin.hdf.keys() \
or "Data.Warning" in plugin.hdf.keys():
value_dict["message_keep"] = {"plugin":plugin, "dataset":{}}
for keep_key in ("Data.Warning", "Data.Success"):
if keep_key in plugin.hdf.keys():
self.cbox.log.info("keeping message: %s" % \
plugin.hdf[keep_key])
value_dict["message_keep"]["dataset"][keep_key] = \
plugin.hdf[keep_key]
new_plugin = self.__plugin_manager.get_plugin(next_template["plugin"])
return self.return_plugin_action(new_plugin)(**value_dict)
## save the currently active plugin name
self.__dataset["Data.ActivePlugin"] = plugin.get_name()
return self.__render(next_template, plugin)
## apply authentication?
if plugin.is_auth_required():
return lambda **args: self.__request_auth()(handler)(self, **args)
else:
return lambda **args: handler(self, **args)
@cherrypy.expose
def test(self, weblang="", help="0", device=None):
"""test authentication - this function may be safely removed
"""
self.__reset_dataset()
self.__set_web_lang(weblang)
self.__check_environment()
return "test passed"
@cherrypy.expose
def test_stream(self, weblang="", help="0", device=None):
"""just for testing purposes - to check if the "stream_response" feature
actually works - for now (September 02006) it does not seem to be ok
"""
import time
yield "<html><head><title>neu</title></head><body><p><ul>"
for num in range(10):
yield "<li>yes: %d - %s</li>" % (num, str(time.time()))
time.sleep(1)
yield "</ul></p></html>"
##################### input checker ##########################
def __check_environment(self):
"""inform the user of suspicious environmental problems
examples are: non-https, readonly-config, ...
"""
## this check is done _after_ "reset_dataset" -> if there is
## a config partition, then it was loaded before
if self.cbox.prefs.requires_partition() \
and not self.cbox.prefs.get_active_partition():
self.__dataset["Data.EnvironmentWarning"] = "ReadOnlyConfig"
#TODO: turn this on soon (add "not") - for now it is annoying
if not self.__check_https():
self.__dataset["Data.EnvironmentWarning"] = "NoSSL"
def __check_https(self):
"""check the request scheme
"""
if cherrypy.request.scheme == "https":
return True
## check an environment setting - this is quite common behind proxies
if os.environ.has_key("HTTPS"):
return True
## this arbitrarily chosen header must be documented in README.proxy
#TODO: check http://jamesthornton.com/writing/openacs-pound.html for this
if cherrypy.request.headers.has_key("X-SSL-Request") \
and (cherrypy.request.headers["X-SSL-Request"] == "1"):
return True
## plaintext connection
return False
def __set_web_lang(self, value):
"""set the preferred priority of languages according to this order:
1. language selected via web interface
2. preferred browser language setting
3. languages defined in the config file
"""
## start with the configured language order
lang_order = self.cbox.prefs["WebSettings"]["Languages"][:]
self.cbox.log.debug(
"updating language preferences (default: %s)" % str(lang_order))
## put the preferred browser language in front
guess = self.__get_browser_language(lang_order)
if guess:
lang_order.remove(guess)
lang_order.insert(0, guess)
self.cbox.log.debug(
"raised priority of preferred browser language: %s" % guess)
## is the chosen language (via web interface) valid? - put it in front
if value and (value in lang_order) and (not re.search(r'\W', value)):
lang_order.remove(value)
lang_order.insert(0, value)
self.cbox.log.debug(
"raised priority of selected language: %s" % value)
elif value:
self.cbox.log.info("invalid language selected: %s" % value)
## store current language setting
self.cbox.log.debug(
"current language preference: %s" % str(lang_order))
self.lang_order = lang_order
self.__dataset["Settings.Language"] = lang_order[0]
self.__dataset["Settings.LinkAttrs.weblang"] = lang_order[0]
def __get_browser_language(self, avail_langs):
"""guess the preferred language of the user (as sent by the browser)
take the first language, that is part of 'avail_langs'
"""
try:
pref_lang_header = cherrypy.request.headers["Accept-Language"]
except KeyError:
## no language header was specified
return None
## this could be a typical 'Accept-Language' header:
## de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
regex = re.compile(r"\w+(-\w+)?(;q=[\d\.]+)?$")
pref_langs = [e.split(";", 1)[0]
for e in pref_lang_header.split(",")
if regex.match(e)]
## is one of these preferred languages available?
for lang in pref_langs:
if lang in avail_langs:
return lang
## we try to be nice: also look for "de" if "de-de" was specified ...
for lang in pref_langs:
## use only the first part of the language
short_lang = lang.split("-", 1)[0]
if short_lang in avail_langs:
return short_lang
## we give up
return None
def __set_device(self, device):
"""check a device name that was chosen via the web interface
issue a warning if the device is invalid"""
if device and re.match(r'[\w /\-]+$', device) \
and self.cbox.get_container(device):
self.cbox.log.debug("select device: %s" % device)
return True
else:
self.cbox.log.warn("invalid device: %s" % device)
self.__dataset["Data.Warning"] = "InvalidDevice"
return False
def __substitute_gettext(self, languages, text_domain, hdf):
"""substitute all texts in the hdf dataset with their translated
counterparts as returned by gettext
"""
import gettext
try:
translator = gettext.translation(text_domain, languages=languages)
except IOError, err_msg:
## no translation found
self.cbox.log.warn("unable to load language file: %s" % err_msg)
return hdf
def walk_tree(parent_name, hdf_node):
"""iterate through all nodes"""
def translate_node(node):
"""turn one single string into unicode"""
if not node.value():
return
for (key, value) in node.attrs():
## ignore all nodes with the 'LINK' attribute
## for now clearsilver is buggy regarding attributes
## buggy -> parsing of a hdf file fails silently
if key == "LINK":
return
## as long as the attributes do not work, we have to rely on
## some magic names to ignore translations
if (parent_name == "Link") and \
(node.name() in ["Rel", "Prot", "Abs"]):
return
try:
#TODO: we should use unicode - or not? - turn it on later
#node.setValue("", translator.ugettext(node.value()))
## quite obscure: ugettext can handle None - gettext breaks instead
node.setValue("", translator.gettext(node.value()))
except UnicodeEncodeError, err_msg:
self.cbox.log.info(
"Failed unicode encoding for gettext: %s - %s" \
% (node.value(),err_msg))
## fallback to default encoding
node.setValue("", translator.gettext(node.value()))
while hdf_node:
translate_node(hdf_node)
walk_tree(hdf_node.name(), hdf_node.child())
hdf_node = hdf_node.next()
walk_tree("", hdf)
def __get_language_data(self):
"""return the hdf dataset of the main interface and all plugins
translations are done according to self.lang_order
"""
## check if the language setting has changed - use cache if possible
if self.__cached_language_data and \
self.__cached_language_data["lang_order"] == self.lang_order:
self.cbox.log.debug(
"using cached language data: %s" % str(self.lang_order))
return self.__cached_language_data["hdf"]
self.cbox.log.debug("generating language data")
hdf = neo_util.HDF()
hdf.readFile(os.path.join(
self.cbox.prefs["Locations"]["TemplateDir"],"language.hdf"))
self.__substitute_gettext(self.lang_order, GETTEXT_DOMAIN, hdf)
## load the language data of all plugins
for plugin in self.__plugin_manager.get_plugins():
pl_lang = plugin.get_language_data()
self.__substitute_gettext(self.lang_order, "%s-feature-%s" % \
(GETTEXT_DOMAIN, plugin.get_name()), pl_lang)
hdf.copy("Plugins.%s" % plugin.get_name(), pl_lang)
self.cbox.log.debug(
"language data for plugin loaded: %s" % plugin.get_name())
## cache result for later retrieval
self.__cached_language_data = \
{"lang_order": self.lang_order, "hdf": hdf}
return hdf
def __render(self, render_info, plugin=None):
'''renders from clearsilver templates and returns the resulting html
'''
## is render_info a string (filename of the template) or a dictionary?
if isinstance(render_info, dict):
template = render_info["template"]
if render_info.has_key("generator"):
generator = render_info["generator"]
else:
generator = None
else:
(template, generator) = (render_info, None)
## load the language data
hdf = neo_util.HDF()
hdf.copy("Lang", self.__get_language_data())
## first: assume, that the template file is in the global
## template directory
self.__dataset["Settings.TemplateFile"] = os.path.abspath(os.path.join(
self.cbox.prefs["Locations"]["TemplateDir"],
template + ".cs"))
if plugin:
## check, if the plugin provides the template file -> overriding
plugin_cs_file = plugin.get_template_filename(template)
if plugin_cs_file:
self.__dataset["Settings.TemplateFile"] = plugin_cs_file
## add the current state of the plugins to the hdf dataset
self.__dataset["Data.Status.Plugins.%s" % plugin.get_name()] = \
plugin.get_status()
## load the dataset of the plugin
plugin.load_dataset(hdf)
self.cbox.log.info("rendering site: " + template)
cs_path = os.path.abspath(os.path.join(
self.cbox.prefs["Locations"]["TemplateDir"], "main.cs"))
if not os.access(cs_path, os.R_OK):
self.cbox.log.error(
"Couldn't read clearsilver file: %s" % cs_path)
yield "Couldn't read clearsilver file: %s" % cs_path
return
self.cbox.log.debug(self.__dataset)
for key in self.__dataset.keys():
hdf.setValue(key, str(self.__dataset[key]))
cs_data = neo_cs.CS(hdf)
cs_data.parseFile(cs_path)
## is there a generator containing additional information?
if not generator:
## all content in one flush
yield cs_data.render()
else:
content_generate = generator()
dummy_line = """<!-- CONTENT_DUMMY -->"""
## now we do it linewise - checking for the content marker
for line in cs_data.render().splitlines():
if line.find(dummy_line) != -1:
yield line.replace(dummy_line, content_generate.next())
else:
yield line + "\n"