handler.py
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handler.py
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	# -- coding: utf-8 --
	##
	## This file is part of Invenio.
	## Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 CERN.
	##
	## Invenio 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.
	##
	## Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
	## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.

	"""
	Apache request handler mechanism.

	It gives the tools to map url to functions, handles the legacy url
	scheme (/search.py queries), HTTP/HTTPS switching, language
	specification,...
	"""

	__revision__ = "$Id$"

	## Import the remote debugger as a first thing, if allowed
	try:
	import invenio.utils.remote_debugger as remote_debugger
	except:
	remote_debugger = None

	import urlparse
	import cgi
	import sys
	import re
	import os
	import gc

	from flask import session
	from invenio.utils import apache
	from invenio.config import CFG_SITE_URL, CFG_SITE_SECURE_URL, \
	CFG_SITE_RECORD, CFG_ACCESS_CONTROL_LEVEL_SITE
	from invenio.base.i18n import wash_language
	from invenio.utils.url import redirect_to_url
	from invenio.ext.logging import register_exception
	from invenio.legacy.webuser import get_preferred_user_language, isGuestUser, \
	getUid, isUserSuperAdmin, collect_user_info, setUid
	from invenio.legacy.wsgi.utils import StringField
	from invenio.modules import apikeys as web_api_key


	## The following variable is True if the installation make any difference
	## between HTTP Vs. HTTPS connections.
	CFG_HAS_HTTPS_SUPPORT = CFG_SITE_SECURE_URL.startswith("https://")

	## The following variable is True if HTTPS is used for any URL.
	CFG_FULL_HTTPS = CFG_SITE_URL.lower().startswith("https://")


	## Set this to True in order to log some more information.
	DEBUG = False

	# List of URIs for which the 'ln' argument must not be added
	# automatically
	CFG_NO_LANG_RECOGNITION_URIS = ['/rss',
	'/oai2d',
	'/journal']


	RE_SLASHES = re.compile('/+')
	RE_SPECIAL_URI = re.compile('^/%s/\d+\|^/collection/.+' % CFG_SITE_RECORD)

	_RE_BAD_MSIE = re.compile("MSIE\s+(\d+\.\d+)")


	def _debug(req, msg):
	"""
	Log the message.

	@param req: the request.
	@param msg: the message.
	@type msg: string
	"""
	if DEBUG:
	req.log_error(msg)


	def _check_result(req, result):
	"""
	Check that a page handler actually wrote something, and
	properly finish the apache request.

	@param req: the request.
	@param result: the produced output.
	@type result: string
	@return: an apache error code
	@rtype: int
	@raise apache.SERVER_RETURN: in case of a HEAD request.
	@note: that this function actually takes care of writing the result
	to the client.
	"""

	if result or req.bytes_sent > 0:

	if result is None:
	result = ""
	else:
	result = str(result)

	# unless content_type was manually set, we will attempt
	# to guess it
	if not req.content_type_set_p:
	# make an attempt to guess content-type
	if result[:100].strip()[:6].lower() == '<html>' \
	or result.find('</') > 0:
	req.content_type = 'text/html'
	else:
	req.content_type = 'text/plain'

	if req.method == 'HEAD':
	if req.status in (apache.HTTP_NOT_FOUND, ):
	raise apache.SERVER_RETURN, req.status
	else:
	req.write(result)

	return apache.OK

	else:
	req.log_error("publisher: %s returned nothing." % `object`)
	return apache.HTTP_INTERNAL_SERVER_ERROR


	class TraversalError(Exception):
	"""
	Exception raised in case of an error in parsing the URL of the request.
	"""
	pass


	class WebInterfaceDirectory(object):
	"""
	A directory groups web pages, and can delegate dispatching of
	requests to the actual handler. This has been heavily borrowed
	from Quixote's dispatching mechanism, with specific adaptations.
	"""

	# Lists the valid URLs contained in this directory.
	_exports = []

	# Set this to True in order to redirect queries over HTTPS
	_force_https = False

	def _translate(self, component):
	"""(component : string) -> string \| None

	Translate a path component into a Python identifier. Returning
	None signifies that the component does not exist.
	"""
	if component in self._exports:
	if component == '':
	return 'index' # implicit mapping
	else:
	return component
	else:
	# check for an explicit external to internal mapping
	for value in self._exports:
	if isinstance(value, tuple):
	if value[0] == component:
	return value[1]
	else:
	return None

	def _lookup(self, component, path):
	""" Override this method if you need to map dynamic URLs.

	It can eat up as much of the remaining path as needed, and
	return the remaining parts, so that the traversal can
	continue.
	"""
	return None, path

	def _traverse(self, req, path, do_head=False, guest_p=True):
	""" Locate the handler of an URI by traversing the elements of
	the path."""

	_debug(req, 'traversing %r' % path)

	component, path = path[0], path[1:]

	name = self._translate(component)

	if name is None:
	obj, path = self._lookup(component, path)
	else:
	obj = getattr(self, name)

	if obj is None:
	_debug(req, 'could not resolve %s' % repr((component, path)))
	raise TraversalError()

	# We have found the next segment. If we know that from this
	# point our subpages are over HTTPS, do the switch.

	if (CFG_FULL_HTTPS or CFG_HAS_HTTPS_SUPPORT and (self._force_https or session.need_https())) and not req.is_https():
	# We need to isolate the part of the URI that is after
	# CFG_SITE_URL, and append that to our CFG_SITE_SECURE_URL.
	original_parts = urlparse.urlparse(req.unparsed_uri)
	plain_prefix_parts = urlparse.urlparse(CFG_SITE_URL)
	secure_prefix_parts = urlparse.urlparse(CFG_SITE_SECURE_URL)

	# Compute the new path
	plain_path = original_parts[2]
	plain_path = secure_prefix_parts[2] + \
	plain_path[len(plain_prefix_parts[2]):]

	# ...and recompose the complete URL
	final_parts = list(secure_prefix_parts)
	final_parts[2] = plain_path
	final_parts[-3:] = original_parts[-3:]

	target = urlparse.urlunparse(final_parts)
	## The following condition used to allow certain URLs to
	## by-pass the forced SSL redirect. Since SSL certificates
	## are deployed on INSPIRE, this is no longer needed
	## Will be left here for reference.
	#from invenio.config import CFG_INSPIRE_SITE
	#if not CFG_INSPIRE_SITE or plain_path.startswith('/youraccount/login'):
	redirect_to_url(req, target)

	# Continue the traversal. If there is a path, continue
	# resolving, otherwise call the method as it is our final
	# renderer. We even pass it the parsed form arguments.
	if path:
	if hasattr(obj, '_traverse'):
	return obj._traverse(req, path, do_head, guest_p)
	else:
	raise apache.SERVER_RETURN, apache.HTTP_NOT_FOUND

	if do_head:
	req.content_type = "text/html; charset=UTF-8"
	raise apache.SERVER_RETURN, apache.DONE

	form = req.form
	#if 'ln' not in form and \
	# req.uri not in CFG_NO_LANG_RECOGNITION_URIS:
	# ln = get_preferred_user_language(req)
	# form.add_field('ln', ln)
	result = _check_result(req, obj(req, form))
	return result

	def __call__(self, req, form):
	""" Maybe resolve the final / of a directory """

	# When this method is called, we either are a directory which
	# has an 'index' method, and we redirect to it, or we don't
	# have such a method, in which case it is a traversal error.

	if "" in self._exports:
	if not form:
	# Fix missing trailing slash as a convenience, unless
	# we are processing a form (in which case it is better
	# to fix the form posting).
	redirect_to_url(req, req.uri + "/", apache.HTTP_MOVED_PERMANENTLY)

	_debug(req, 'directory %r is not callable' % self)
	raise TraversalError()


	def create_handler(root):
	""" Return a handler function that will dispatch apache requests
	through the URL layout passed in parameter."""

	def _handler(req):
	""" This handler is invoked by mod_python with the apache request."""
	allowed_methods = ("GET", "POST", "HEAD", "OPTIONS", "PUT")
	#req.allow_methods(allowed_methods, 1)
	#if req.method not in allowed_methods:
	# raise apache.SERVER_RETURN, apache.HTTP_METHOD_NOT_ALLOWED

	if req.method == 'OPTIONS':
	## OPTIONS is used to now which method are allowed
	req.headers_out['Allow'] = ', '.join(allowed_methods)
	raise apache.SERVER_RETURN, apache.OK

	# Set user agent for fckeditor.py, which needs it here
	os.environ["HTTP_USER_AGENT"] = req.headers_in.get('User-Agent', '')

	# Check if REST authentication can be performed
	if req.args:
	args = cgi.parse_qs(req.args)
	if 'apikey' in args and req.is_https():
	uid = web_api_key.acc_get_uid_from_request(req.uri, req.args)
	if uid < 0:
	raise apache.SERVER_RETURN, apache.HTTP_UNAUTHORIZED
	else:
	setUid(req=req, uid=uid)

	guest_p = isGuestUser(getUid(req), run_on_slave=False)

	uri = req.uri
	if uri == '/':
	path = ['']
	else:
	## Let's collapse multiple slashes into a single /
	uri = RE_SLASHES.sub('/', uri)
	path = uri[1:].split('/')

	if CFG_ACCESS_CONTROL_LEVEL_SITE > 1:
	## If the site is under maintainance mode let's return
	## 503 to casual crawler to avoid having the site being
	## indexed
	req.status = 503

	g = _RE_BAD_MSIE.search(req.headers_in.get('User-Agent', "MSIE 6.0"))
	bad_msie = g and float(g.group(1)) < 9.0
	if uri.startswith('/yours') or not guest_p:
	## Private/personalized request should not be cached
	if bad_msie and req.is_https():
	req.headers_out['Cache-Control'] = 'private, max-age=0, must-revalidate'
	else:
	req.headers_out['Cache-Control'] = 'private, no-cache, no-store, max-age=0, must-revalidate'
	req.headers_out['Pragma'] = 'no-cache'
	req.headers_out['Vary'] = '*'
	elif not (bad_msie and req.is_https()):
	req.headers_out['Cache-Control'] = 'public, max-age=3600'
	req.headers_out['Vary'] = 'Cookie, ETag, Cache-Control'

	try:
	if req.header_only and not RE_SPECIAL_URI.match(req.uri):
	return root._traverse(req, path, True, guest_p)
	else:
	## bibdocfile have a special treatment for HEAD
	return root._traverse(req, path, False, guest_p)
	except TraversalError:
	raise apache.SERVER_RETURN, apache.HTTP_NOT_FOUND
	except apache.SERVER_RETURN:
	## This is one of mod_python way of communicating
	raise
	except IOError, exc:
	if 'Write failed, client closed connection' not in "%s" % exc:
	## Workaround for considering as false positive exceptions
	## rised by mod_python when the user close the connection
	## or in some other rare and not well identified cases.
	register_exception(req=req, alert_admin=True)
	raise
	except Exception:
	# send the error message, much more convenient than log hunting
	if remote_debugger:
	args = {}
	if req.args:
	args = cgi.parse_qs(req.args)
	if 'debug' in args:
	remote_debugger.error_msg(args['debug'])
	register_exception(req=req, alert_admin=True)
	raise

	# Serve an error by default.
	raise apache.SERVER_RETURN, apache.HTTP_NOT_FOUND
	return _handler


	def wash_urlargd(form, content):
	"""
	Wash the complete form based on the specification in
	content. Content is a dictionary containing the field names as a
	key, and a tuple (type, default) as value.

	'type' can be list, str, invenio.legacy.wsgi.utils.StringField, int, tuple, or
	invenio.legacy.wsgi.utils.Field (for
	file uploads).

	The specification automatically includes the 'ln' field, which is
	common to all queries.

	Arguments that are not defined in 'content' are discarded.

	Note that in case {list,tuple} were asked for, we assume that
	{list,tuple} of strings is to be returned. Therefore beware when
	you want to use wash_urlargd() for multiple file upload forms.

	@Return: argd dictionary that can be used for passing function
	parameters by keywords.
	"""

	result = {}

	content['ln'] = (str, '')

	for k, (dst_type, default) in content.items():
	try:
	value = form[k]
	except KeyError:
	result[k] = default
	continue

	#FIXES problems with unicode arguments from Flask
	if isinstance(value, unicode):
	value = value.encode('utf-8')

	src_type = type(value)

	# First, handle the case where we want all the results. In
	# this case, we need to ensure all the elements are strings,
	# and not Field instances.
	if src_type in (list, tuple):
	if dst_type is list:
	result[k] = [str(x) for x in value]
	continue

	if dst_type is tuple:
	result[k] = tuple([str(x) for x in value])
	continue

	# in all the other cases, we are only interested in the
	# first value.
	value = value[0]

	# Maybe we already have what is expected? Then don't change
	# anything.
	if isinstance(value, dst_type):
	if isinstance(value, StringField):
	result[k] = str(value)
	else:
	result[k] = value
	continue

	# Since we got here, 'value' is sure to be a single symbol,
	# not a list kind of structure anymore.
	if dst_type in (str, int):
	try:
	result[k] = dst_type(value)
	except:
	result[k] = default

	elif dst_type is tuple:
	result[k] = (str(value), )

	elif dst_type is list:
	result[k] = [str(value)]

	else:
	raise ValueError('cannot cast form value %s of type %r into type %r' % (value, src_type, dst_type))

	result['ln'] = wash_language(result['ln'])

	return result

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