http.py

# -*- coding: utf-8 -*-
#----------------------------------------------------------
# OpenERP HTTP layer
#----------------------------------------------------------
import ast
import collections
import contextlib
import datetime
import errno
import functools
import getpass
import inspect
import logging
import mimetypes
import os
import random
import re
import sys
import tempfile
import threading
import time
import traceback
import urlparse
import warnings
from zlib import adler32

import babel.core
import psutil
import psycopg2
import simplejson
import werkzeug.contrib.sessions
import werkzeug.datastructures
import werkzeug.exceptions
import werkzeug.local
import werkzeug.routing
import werkzeug.wrappers
import werkzeug.wsgi
from werkzeug.wsgi import wrap_file

import openerp
from openerp import SUPERUSER_ID
from openerp.service import security, model as service_model
from openerp.tools.func import lazy_property
from openerp.tools import ustr

_logger = logging.getLogger(__name__)

# 1 week cache for statics as advised by Google Page Speed
STATIC_CACHE = 60 * 60 * 24 * 7

#----------------------------------------------------------
# RequestHandler
#----------------------------------------------------------
# Thread local global request object
_request_stack = werkzeug.local.LocalStack()

request = _request_stack()
"""
    A global proxy that always redirect to the current request object.
"""

def replace_request_password(args):
    # password is always 3rd argument in a request, we replace it in RPC logs
    # so it's easier to forward logs for diagnostics/debugging purposes...
    if len(args) > 2:
        args = list(args)
        args[2] = '*'
    return tuple(args)

def dispatch_rpc(service_name, method, params):
    """ Handle a RPC call.

    This is pure Python code, the actual marshalling (from/to XML-RPC) is done
    in a upper layer.
    """
    try:
        rpc_request = logging.getLogger(__name__ + '.rpc.request')
        rpc_response = logging.getLogger(__name__ + '.rpc.response')
        rpc_request_flag = rpc_request.isEnabledFor(logging.DEBUG)
        rpc_response_flag = rpc_response.isEnabledFor(logging.DEBUG)
        if rpc_request_flag or rpc_response_flag:
            start_time = time.time()
            start_rss, start_vms = 0, 0
            start_rss, start_vms = psutil.Process(os.getpid()).get_memory_info()
            if rpc_request and rpc_response_flag:
                openerp.netsvc.log(rpc_request, logging.DEBUG, '%s.%s' % (service_name, method), replace_request_password(params))

        threading.current_thread().uid = None
        threading.current_thread().dbname = None
        if service_name == 'common':
            dispatch = openerp.service.common.dispatch
        elif service_name == 'db':
            dispatch = openerp.service.db.dispatch
        elif service_name == 'object':
            dispatch = openerp.service.model.dispatch
        elif service_name == 'report':
            dispatch = openerp.service.report.dispatch
        else:
            dispatch = openerp.service.wsgi_server.rpc_handlers.get(service_name)
        result = dispatch(method, params)

        if rpc_request_flag or rpc_response_flag:
            end_time = time.time()
            end_rss, end_vms = 0, 0
            end_rss, end_vms = psutil.Process(os.getpid()).get_memory_info()
            logline = '%s.%s time:%.3fs mem: %sk -> %sk (diff: %sk)' % (service_name, method, end_time - start_time, start_vms / 1024, end_vms / 1024, (end_vms - start_vms)/1024)
            if rpc_response_flag:
                openerp.netsvc.log(rpc_response, logging.DEBUG, logline, result)
            else:
                openerp.netsvc.log(rpc_request, logging.DEBUG, logline, replace_request_password(params), depth=1)

        return result
    except (openerp.osv.orm.except_orm, openerp.exceptions.AccessError, \
            openerp.exceptions.AccessDenied, openerp.exceptions.Warning, \
            openerp.exceptions.RedirectWarning):
        raise
    except openerp.exceptions.DeferredException, e:
        _logger.exception(openerp.tools.exception_to_unicode(e))
        openerp.tools.debugger.post_mortem(openerp.tools.config, e.traceback)
        raise
    except Exception, e:
        _logger.exception(openerp.tools.exception_to_unicode(e))
        openerp.tools.debugger.post_mortem(openerp.tools.config, sys.exc_info())
        raise

def local_redirect(path, query=None, keep_hash=False, forward_debug=True, code=303):
    url = path
    if not query:
        query = {}
    if forward_debug and request and request.debug:
        query['debug'] = None
    if query:
        url += '?' + werkzeug.url_encode(query)
    if keep_hash:
        return redirect_with_hash(url, code)
    else:
        return werkzeug.utils.redirect(url, code)

def redirect_with_hash(url, code=303):
    # Most IE and Safari versions decided not to preserve location.hash upon
    # redirect. And even if IE10 pretends to support it, it still fails
    # inexplicably in case of multiple redirects (and we do have some).
    # See extensive test page at http://greenbytes.de/tech/tc/httpredirects/
    if request.httprequest.user_agent.browser in ('firefox',):
        return werkzeug.utils.redirect(url, code)
    return "<html><head><script>window.location = '%s' + location.hash;</script></head></html>" % url

class WebRequest(object):
    """ Parent class for all Odoo Web request types, mostly deals with
    initialization and setup of the request object (the dispatching itself has
    to be handled by the subclasses)

    :param httprequest: a wrapped werkzeug Request object
    :type httprequest: :class:`werkzeug.wrappers.BaseRequest`

    .. attribute:: httprequest

        the original :class:`werkzeug.wrappers.Request` object provided to the
        request

    .. attribute:: params

        :class:`~collections.Mapping` of request parameters, not generally
        useful as they're provided directly to the handler method as keyword
        arguments
    """
    def __init__(self, httprequest):
        self.httprequest = httprequest
        self.httpresponse = None
        self.httpsession = httprequest.session
        self.disable_db = False
        self.uid = None
        self.endpoint = None
        self.auth_method = None
        self._cr = None

        # prevents transaction commit, use when you catch an exception during handling
        self._failed = None

        # set db/uid trackers - they're cleaned up at the WSGI
        # dispatching phase in openerp.service.wsgi_server.application
        if self.db:
            threading.current_thread().dbname = self.db
        if self.session.uid:
            threading.current_thread().uid = self.session.uid

    @lazy_property
    def env(self):
        """
        The :class:`~openerp.api.Environment` bound to current request.
        """
        return openerp.api.Environment(self.cr, self.uid, self.context)

    @lazy_property
    def context(self):
        """
        :class:`~collections.Mapping` of context values for the current
        request
        """
        return dict(self.session.context)

    @lazy_property
    def lang(self):
        return self.context["lang"]

    @lazy_property
    def session(self):
        """
        a :class:`OpenERPSession` holding the HTTP session data for the
        current http session
        """
        return self.httprequest.session

    @property
    def cr(self):
        """
        :class:`~openerp.sql_db.Cursor` initialized for the current method
        call.

        Accessing the cursor when the current request uses the ``none``
        authentication will raise an exception.
        """
        # can not be a lazy_property because manual rollback in _call_function
        # if already set (?)
        if not self._cr:
            self._cr = self.registry.cursor()
        return self._cr

    def __enter__(self):
        _request_stack.push(self)
        return self

    def __exit__(self, exc_type, exc_value, traceback):
        _request_stack.pop()

        if self._cr:
            if exc_type is None and not self._failed:
                self._cr.commit()
            self._cr.close()
        # just to be sure no one tries to re-use the request
        self.disable_db = True
        self.uid = None

    def set_handler(self, endpoint, arguments, auth):
        # is this needed ?
        arguments = dict((k, v) for k, v in arguments.iteritems()
                         if not k.startswith("_ignored_"))

        endpoint.arguments = arguments
        self.endpoint = endpoint
        self.auth_method = auth


    def _handle_exception(self, exception):
        """Called within an except block to allow converting exceptions
           to abitrary responses. Anything returned (except None) will
           be used as response.""" 
        self._failed = exception # prevent tx commit
        raise

    def _call_function(self, *args, **kwargs):
        request = self
        if self.endpoint.routing['type'] != self._request_type:
            raise Exception("%s, %s: Function declared as capable of handling request of type '%s' but called with a request of type '%s'" \
                % (self.endpoint.original, self.httprequest.path, self.endpoint.routing['type'], self._request_type))

        kwargs.update(self.endpoint.arguments)

        # Backward for 7.0
        if self.endpoint.first_arg_is_req:
            args = (request,) + args

        # Correct exception handling and concurency retry
        @service_model.check
        def checked_call(___dbname, *a, **kw):
            # The decorator can call us more than once if there is an database error. In this
            # case, the request cursor is unusable. Rollback transaction to create a new one.
            if self._cr:
                self._cr.rollback()
            return self.endpoint(*a, **kw)

        if self.db:
            return checked_call(self.db, *args, **kwargs)
        return self.endpoint(*args, **kwargs)

    @property
    def debug(self):
        """ Indicates whether the current request is in "debug" mode
        """
        return 'debug' in self.httprequest.args

    @contextlib.contextmanager
    def registry_cr(self):
        warnings.warn('please use request.registry and request.cr directly', DeprecationWarning)
        yield (self.registry, self.cr)

    @lazy_property
    def session_id(self):
        """
        opaque identifier for the :class:`OpenERPSession` instance of
        the current request

        .. deprecated:: 8.0

            Use the ``sid`` attribute on :attr:`.session`
        """
        return self.session.sid

    @property
    def registry(self):
        """
        The registry to the database linked to this request. Can be ``None``
        if the current request uses the ``none`` authentication.

        .. deprecated:: 8.0

            use :attr:`.env`
        """
        return openerp.modules.registry.RegistryManager.get(self.db) if self.db else None

    @property
    def db(self):
        """
        The database linked to this request. Can be ``None``
        if the current request uses the ``none`` authentication.
        """
        return self.session.db if not self.disable_db else None

    @lazy_property
    def httpsession(self):
        """ HTTP session data

        .. deprecated:: 8.0

            Use :attr:`.session` instead.
        """
        return self.session

def route(route=None, **kw):
    """
    Decorator marking the decorated method as being a handler for
    requests. The method must be part of a subclass of ``Controller``.

    :param route: string or array. The route part that will determine which
                  http requests will match the decorated method. Can be a
                  single string or an array of strings. See werkzeug's routing
                  documentation for the format of route expression (
                  http://werkzeug.pocoo.org/docs/routing/ ).
    :param type: The type of request, can be ``'http'`` or ``'json'``.
    :param auth: The type of authentication method, can on of the following:

                 * ``user``: The user must be authenticated and the current request
                   will perform using the rights of the user.
                 * ``admin``: The user may not be authenticated and the current request
                   will perform using the admin user.
                 * ``none``: The method is always active, even if there is no
                   database. Mainly used by the framework and authentication
                   modules. There request code will not have any facilities to access
                   the database nor have any configuration indicating the current
                   database nor the current user.
    :param methods: A sequence of http methods this route applies to. If not
                    specified, all methods are allowed.
    :param cors: The Access-Control-Allow-Origin cors directive value.
    """
    routing = kw.copy()
    assert not 'type' in routing or routing['type'] in ("http", "json")
    def decorator(f):
        if route:
            if isinstance(route, list):
                routes = route
            else:
                routes = [route]
            routing['routes'] = routes
        @functools.wraps(f)
        def response_wrap(*args, **kw):
            response = f(*args, **kw)
            if isinstance(response, Response) or f.routing_type == 'json':
                return response
            elif isinstance(response, werkzeug.wrappers.BaseResponse):
                response = Response.force_type(response)
                response.set_default()
                return response
            elif isinstance(response, basestring):
                return Response(response)
            else:
                _logger.warn("<function %s.%s> returns an invalid response type for an http request" % (f.__module__, f.__name__))
            return response
        response_wrap.routing = routing
        response_wrap.original_func = f
        return response_wrap
    return decorator

class JsonRequest(WebRequest):
    """ Request handler for `JSON-RPC 2
    <http://www.jsonrpc.org/specification>`_ over HTTP

    * ``method`` is ignored
    * ``params`` must be a JSON object (not an array) and is passed as keyword
      arguments to the handler method
    * the handler method's result is returned as JSON-RPC ``result`` and
      wrapped in the `JSON-RPC Response
      <http://www.jsonrpc.org/specification#response_object>`_

    Sucessful request::

      --> {"jsonrpc": "2.0",
           "method": "call",
           "params": {"context": {},
                      "arg1": "val1" },
           "id": null}

      <-- {"jsonrpc": "2.0",
           "result": { "res1": "val1" },
           "id": null}

    Request producing a error::

      --> {"jsonrpc": "2.0",
           "method": "call",
           "params": {"context": {},
                      "arg1": "val1" },
           "id": null}

      <-- {"jsonrpc": "2.0",
           "error": {"code": 1,
                     "message": "End user error message.",
                     "data": {"code": "codestring",
                              "debug": "traceback" } },
           "id": null}

    """
    _request_type = "json"

    def __init__(self, *args):
        super(JsonRequest, self).__init__(*args)

        self.jsonp_handler = None

        args = self.httprequest.args
        jsonp = args.get('jsonp')
        self.jsonp = jsonp
        request = None
        request_id = args.get('id')
        
        if jsonp and self.httprequest.method == 'POST':
            # jsonp 2 steps step1 POST: save call
            def handler():
                self.session['jsonp_request_%s' % (request_id,)] = self.httprequest.form['r']
                self.session.modified = True
                headers=[('Content-Type', 'text/plain; charset=utf-8')]
                r = werkzeug.wrappers.Response(request_id, headers=headers)
                return r
            self.jsonp_handler = handler
            return
        elif jsonp and args.get('r'):
            # jsonp method GET
            request = args.get('r')
        elif jsonp and request_id:
            # jsonp 2 steps step2 GET: run and return result
            request = self.session.pop('jsonp_request_%s' % (request_id,), '{}')
        else:
            # regular jsonrpc2
            request = self.httprequest.stream.read()

        # Read POST content or POST Form Data named "request"
        self.jsonrequest = simplejson.loads(request)
        self.params = dict(self.jsonrequest.get("params", {}))
        self.context = self.params.pop('context', dict(self.session.context))

    def _json_response(self, result=None, error=None):
        response = {
            'jsonrpc': '2.0',
            'id': self.jsonrequest.get('id')
            }
        if error is not None:
            response['error'] = error
        if result is not None:
            response['result'] = result

        if self.jsonp:
            # If we use jsonp, that's mean we are called from another host
            # Some browser (IE and Safari) do no allow third party cookies
            # We need then to manage http sessions manually.
            response['session_id'] = self.session_id
            mime = 'application/javascript'
            body = "%s(%s);" % (self.jsonp, simplejson.dumps(response),)
        else:
            mime = 'application/json'
            body = simplejson.dumps(response)

        return Response(
                    body, headers=[('Content-Type', mime),
                                   ('Content-Length', len(body))])

    def _handle_exception(self, exception):
        """Called within an except block to allow converting exceptions
           to arbitrary responses. Anything returned (except None) will
           be used as response."""
        try:
            return super(JsonRequest, self)._handle_exception(exception)
        except Exception:
            _logger.exception("Exception during JSON request handling.")
            error = {
                    'code': 200,
                    'message': "OpenERP Server Error",
                    'data': serialize_exception(exception)
            }
            if isinstance(exception, AuthenticationError):
                error['code'] = 100
                error['message'] = "OpenERP Session Invalid"
            return self._json_response(error=error)

    def dispatch(self):
        if self.jsonp_handler:
            return self.jsonp_handler()
        try:
            result = self._call_function(**self.params)
            return self._json_response(result)
        except Exception, e:
            return self._handle_exception(e)

def serialize_exception(e):
    tmp = {
        "name": type(e).__module__ + "." + type(e).__name__ if type(e).__module__ else type(e).__name__,
        "debug": traceback.format_exc(),
        "message": ustr(e),
        "arguments": to_jsonable(e.args),
    }
    if isinstance(e, openerp.osv.osv.except_osv):
        tmp["exception_type"] = "except_osv"
    elif isinstance(e, openerp.exceptions.Warning):
        tmp["exception_type"] = "warning"
    elif isinstance(e, openerp.exceptions.AccessError):
        tmp["exception_type"] = "access_error"
    elif isinstance(e, openerp.exceptions.AccessDenied):
        tmp["exception_type"] = "access_denied"
    return tmp

def to_jsonable(o):
    if isinstance(o, str) or isinstance(o,unicode) or isinstance(o, int) or isinstance(o, long) \
        or isinstance(o, bool) or o is None or isinstance(o, float):
        return o
    if isinstance(o, list) or isinstance(o, tuple):
        return [to_jsonable(x) for x in o]
    if isinstance(o, dict):
        tmp = {}
        for k, v in o.items():
            tmp[u"%s" % k] = to_jsonable(v)
        return tmp
    return ustr(o)

def jsonrequest(f):
    """ 
        .. deprecated:: 8.0
            Use the :func:`~openerp.http.route` decorator instead.
    """
    base = f.__name__.lstrip('/')
    if f.__name__ == "index":
        base = ""
    return route([base, base + "/<path:_ignored_path>"], type="json", auth="user", combine=True)(f)

class HttpRequest(WebRequest):
    """ Handler for the ``http`` request type.

    matched routing parameters, query string parameters, form_ parameters
    and files are passed to the handler method as keyword arguments.

    In case of name conflict, routing parameters have priority.

    The handler method's result can be:

    * a falsy value, in which case the HTTP response will be an
      `HTTP 204`_ (No Content)
    * a werkzeug Response object, which is returned as-is
    * a ``str`` or ``unicode``, will be wrapped in a Response object and
      interpreted as HTML

    .. _form: http://www.w3.org/TR/html401/interact/forms.html#h-17.13.4.2
    .. _HTTP 204: http://tools.ietf.org/html/rfc7231#section-6.3.5
    """
    _request_type = "http"

    def __init__(self, *args):
        super(HttpRequest, self).__init__(*args)
        params = self.httprequest.args.to_dict()
        params.update(self.httprequest.form.to_dict())
        params.update(self.httprequest.files.to_dict())
        params.pop('session_id', None)
        self.params = params

    def _handle_exception(self, exception):
        """Called within an except block to allow converting exceptions
           to abitrary responses. Anything returned (except None) will
           be used as response."""
        try:
            return super(HttpRequest, self)._handle_exception(exception)
        except SessionExpiredException:
            if not request.params.get('noredirect'):
                query = werkzeug.urls.url_encode({
                    'redirect': request.httprequest.url,
                })
                return werkzeug.utils.redirect('/web/login?%s' % query)
        except werkzeug.exceptions.HTTPException, e:
            return e

    def dispatch(self):
        if request.httprequest.method == 'OPTIONS' and request.endpoint and request.endpoint.routing.get('cors'):
            headers = {
                'Access-Control-Max-Age': 60 * 60 * 24,
                'Access-Control-Allow-Headers': 'Origin, X-Requested-With, Content-Type, Accept'
            }
            return Response(status=200, headers=headers)

        r = self._call_function(**self.params)
        if not r:
            r = Response(status=204)  # no content
        return r

    def make_response(self, data, headers=None, cookies=None):
        """ Helper for non-HTML responses, or HTML responses with custom
        response headers or cookies.

        While handlers can just return the HTML markup of a page they want to
        send as a string if non-HTML data is returned they need to create a
        complete response object, or the returned data will not be correctly
        interpreted by the clients.

        :param basestring data: response body
        :param headers: HTTP headers to set on the response
        :type headers: ``[(name, value)]``
        :param collections.Mapping cookies: cookies to set on the client
        """
        response = Response(data, headers=headers)
        if cookies:
            for k, v in cookies.iteritems():
                response.set_cookie(k, v)
        return response

    def render(self, template, qcontext=None, lazy=True, **kw):
        """ Lazy render of a QWeb template.

        The actual rendering of the given template will occur at then end of
        the dispatching. Meanwhile, the template and/or qcontext can be
        altered or even replaced by a static response.

        :param basestring template: template to render
        :param dict qcontext: Rendering context to use
        :param bool lazy: whether the template rendering should be deferred
                          until the last possible moment
        :param kw: forwarded to werkzeug's Response object
        """
        response = Response(template=template, qcontext=qcontext, **kw)
        if not lazy:
            return response.render()
        return response

    def not_found(self, description=None):
        """ Shortcut for a `HTTP 404
        <http://tools.ietf.org/html/rfc7231#section-6.5.4>`_ (Not Found)
        response
        """
        return werkzeug.exceptions.NotFound(description)

def httprequest(f):
    """ 
        .. deprecated:: 8.0

        Use the :func:`~openerp.http.route` decorator instead.
    """
    base = f.__name__.lstrip('/')
    if f.__name__ == "index":
        base = ""
    return route([base, base + "/<path:_ignored_path>"], type="http", auth="user", combine=True)(f)

#----------------------------------------------------------
# Controller and route registration
#----------------------------------------------------------
addons_module = {}
addons_manifest = {}
controllers_per_module = collections.defaultdict(list)

class ControllerType(type):
    def __init__(cls, name, bases, attrs):
        super(ControllerType, cls).__init__(name, bases, attrs)

        # flag old-style methods with req as first argument
        for k, v in attrs.items():
            if inspect.isfunction(v) and hasattr(v, 'original_func'):
                # Set routing type on original functions
                routing_type = v.routing.get('type')
                parent = [claz for claz in bases if isinstance(claz, ControllerType) and hasattr(claz, k)]
                parent_routing_type = getattr(parent[0], k).original_func.routing_type if parent else routing_type or 'http'
                if routing_type is not None and routing_type is not parent_routing_type:
                    routing_type = parent_routing_type
                    _logger.warn("Subclass re-defines <function %s.%s.%s> with different type than original."
                                    " Will use original type: %r" % (cls.__module__, cls.__name__, k, parent_routing_type))
                v.original_func.routing_type = routing_type or parent_routing_type

                spec = inspect.getargspec(v.original_func)
                first_arg = spec.args[1] if len(spec.args) >= 2 else None
                if first_arg in ["req", "request"]:
                    v._first_arg_is_req = True

        # store the controller in the controllers list
        name_class = ("%s.%s" % (cls.__module__, cls.__name__), cls)
        class_path = name_class[0].split(".")
        if not class_path[:2] == ["openerp", "addons"]:
            module = ""
        else:
            # we want to know all modules that have controllers
            module = class_path[2]
        # but we only store controllers directly inheriting from Controller
        if not "Controller" in globals() or not Controller in bases:
            return
        controllers_per_module[module].append(name_class)

class Controller(object):
    __metaclass__ = ControllerType

class EndPoint(object):
    def __init__(self, method, routing):
        self.method = method
        self.original = getattr(method, 'original_func', method)
        self.routing = routing
        self.arguments = {}

    @property
    def first_arg_is_req(self):
        # Backward for 7.0
        return getattr(self.method, '_first_arg_is_req', False)

    def __call__(self, *args, **kw):
        return self.method(*args, **kw)

def routing_map(modules, nodb_only, converters=None):
    routing_map = werkzeug.routing.Map(strict_slashes=False, converters=converters)

    def get_subclasses(klass):
        def valid(c):
            return c.__module__.startswith('openerp.addons.') and c.__module__.split(".")[2] in modules
        subclasses = klass.__subclasses__()
        result = []
        for subclass in subclasses:
            if valid(subclass):
                result.extend(get_subclasses(subclass))
        if not result and valid(klass):
            result = [klass]
        return result

    uniq = lambda it: collections.OrderedDict((id(x), x) for x in it).values()

    for module in modules:
        if module not in controllers_per_module:
            continue

        for _, cls in controllers_per_module[module]:
            subclasses = uniq(c for c in get_subclasses(cls) if c is not cls)
            if subclasses:
                name = "%s (extended by %s)" % (cls.__name__, ', '.join(sub.__name__ for sub in subclasses))
                cls = type(name, tuple(reversed(subclasses)), {})

            o = cls()
            members = inspect.getmembers(o, inspect.ismethod)
            for _, mv in members:
                if hasattr(mv, 'routing'):
                    routing = dict(type='http', auth='user', methods=None, routes=None)
                    methods_done = list()
                    # update routing attributes from subclasses(auth, methods...)
                    for claz in reversed(mv.im_class.mro()):
                        fn = getattr(claz, mv.func_name, None)
                        if fn and hasattr(fn, 'routing') and fn not in methods_done:
                            methods_done.append(fn)
                            routing.update(fn.routing)
                    if not nodb_only or routing['auth'] == "none":
                        assert routing['routes'], "Method %r has not route defined" % mv
                        endpoint = EndPoint(mv, routing)
                        for url in routing['routes']:
                            if routing.get("combine", False):
                                # deprecated v7 declaration
                                url = o._cp_path.rstrip('/') + '/' + url.lstrip('/')
                                if url.endswith("/") and len(url) > 1:
                                    url = url[: -1]

                            routing_map.add(werkzeug.routing.Rule(url, endpoint=endpoint, methods=routing['methods']))
    return routing_map

#----------------------------------------------------------
# HTTP Sessions
#----------------------------------------------------------
class AuthenticationError(Exception):
    pass

class SessionExpiredException(Exception):
    pass

class Service(object):
    """
        .. deprecated:: 8.0
            Use :func:`dispatch_rpc` instead.
    """
    def __init__(self, session, service_name):
        self.session = session
        self.service_name = service_name

    def __getattr__(self, method):
        def proxy_method(*args):
            result = dispatch_rpc(self.service_name, method, args)
            return result
        return proxy_method

class Model(object):
    """
        .. deprecated:: 8.0
            Use the registry and cursor in :data:`request` instead.
    """
    def __init__(self, session, model):
        self.session = session
        self.model = model
        self.proxy = self.session.proxy('object')

    def __getattr__(self, method):
        self.session.assert_valid()
        def proxy(*args, **kw):
            # Can't provide any retro-compatibility for this case, so we check it and raise an Exception
            # to tell the programmer to adapt his code
            if not request.db or not request.uid or self.session.db != request.db \
                or self.session.uid != request.uid:
                raise Exception("Trying to use Model with badly configured database or user.")
                
            if method.startswith('_'):
                raise Exception("Access denied")
            mod = request.registry[self.model]
            meth = getattr(mod, method)
            cr = request.cr
            result = meth(cr, request.uid, *args, **kw)
            # reorder read
            if method == "read":
                if isinstance(result, list) and len(result) > 0 and "id" in result[0]:
                    index = {}
                    for r in result:
                        index[r['id']] = r
                    result = [index[x] for x in args[0] if x in index]
            return result
        return proxy

class OpenERPSession(werkzeug.contrib.sessions.Session):
    def __init__(self, *args, **kwargs):
        self.inited = False
        self.modified = False
        super(OpenERPSession, self).__init__(*args, **kwargs)
        self.inited = True
        self._default_values()
        self.modified = False

    def __getattr__(self, attr):
        return self.get(attr, None)
    def __setattr__(self, k, v):
        if getattr(self, "inited", False):
            try:
                object.__getattribute__(self, k)
            except:
                return self.__setitem__(k, v)
        object.__setattr__(self, k, v)

    def authenticate(self, db, login=None, password=None, uid=None):
        """
        Authenticate the current user with the given db, login and
        password. If successful, store the authentication parameters in the
        current session and request.

        :param uid: If not None, that user id will be used instead the login
                    to authenticate the user.
        """

        if uid is None:
            wsgienv = request.httprequest.environ
            env = dict(
                base_location=request.httprequest.url_root.rstrip('/'),
                HTTP_HOST=wsgienv['HTTP_HOST'],
                REMOTE_ADDR=wsgienv['REMOTE_ADDR'],
            )
            uid = dispatch_rpc('common', 'authenticate', [db, login, password, env])
        else:
            security.check(db, uid, password)
        self.db = db
        self.uid = uid
        self.login = login
        self.password = password
        request.uid = uid
        request.disable_db = False

        if uid: self.get_context()
        return uid

    def check_security(self):
        """
        Check the current authentication parameters to know if those are still
        valid. This method should be called at each request. If the
        authentication fails, a :exc:`SessionExpiredException` is raised.
        """
        if not self.db or not self.uid:
            raise SessionExpiredException("Session expired")
        security.check(self.db, self.uid, self.password)

    def logout(self, keep_db=False):
        for k in self.keys():
            if not (keep_db and k == 'db'):
                del self[k]
        self._default_values()

    def _default_values(self):
        self.setdefault("db", None)
        self.setdefault("uid", None)
        self.setdefault("login", None)
        self.setdefault("password", None)
        self.setdefault("context", {})

    def get_context(self):
        """
        Re-initializes the current user's session context (based on his
        preferences) by calling res.users.get_context() with the old context.

        :returns: the new context
        """
        assert self.uid, "The user needs to be logged-in to initialize his context"
        self.context = request.registry.get('res.users').context_get(request.cr, request.uid) or {}
        self.context['uid'] = self.uid
        self._fix_lang(self.context)
        return self.context

    def _fix_lang(self, context):
        """ OpenERP provides languages which may not make sense and/or may not
        be understood by the web client's libraries.

        Fix those here.

        :param dict context: context to fix
        """
        lang = context['lang']

        # inane OpenERP locale
        if lang == 'ar_AR':
            lang = 'ar'

        # lang to lang_REGION (datejs only handles lang_REGION, no bare langs)
        if lang in babel.core.LOCALE_ALIASES:
            lang = babel.core.LOCALE_ALIASES[lang]

        context['lang'] = lang or 'en_US'

    # Deprecated to be removed in 9

    """
        Damn properties for retro-compatibility. All of that is deprecated,
        all of that.
    """
    @property
    def _db(self):
        return self.db
    @_db.setter
    def _db(self, value):
        self.db = value
    @property
    def _uid(self):
        return self.uid
    @_uid.setter
    def _uid(self, value):
        self.uid = value
    @property
    def _login(self):
        return self.login
    @_login.setter
    def _login(self, value):
        self.login = value
    @property
    def _password(self):
        return self.password
    @_password.setter
    def _password(self, value):
        self.password = value

    def send(self, service_name, method, *args):
        """
        .. deprecated:: 8.0
            Use :func:`dispatch_rpc` instead.
        """
        return dispatch_rpc(service_name, method, args)

    def proxy(self, service):
        """
        .. deprecated:: 8.0
            Use :func:`dispatch_rpc` instead.
        """
        return Service(self, service)

    def assert_valid(self, force=False):
        """
        .. deprecated:: 8.0
            Use :meth:`check_security` instead.

        Ensures this session is valid (logged into the openerp server)
        """
        if self.uid and not force:
            return
        # TODO use authenticate instead of login
        self.uid = self.proxy("common").login(self.db, self.login, self.password)
        if not self.uid:
            raise AuthenticationError("Authentication failure")

    def ensure_valid(self):
        """
        .. deprecated:: 8.0
            Use :meth:`check_security` instead.
        """
        if self.uid:
            try:
                self.assert_valid(True)
            except Exception:
                self.uid = None

    def execute(self, model, func, *l, **d):
        """
        .. deprecated:: 8.0
            Use the registry and cursor in :data:`request` instead.
        """
        model = self.model(model)
        r = getattr(model, func)(*l, **d)
        return r

    def exec_workflow(self, model, id, signal):
        """
        .. deprecated:: 8.0
            Use the registry and cursor in :data:`request` instead.
        """
        self.assert_valid()
        r = self.proxy('object').exec_workflow(self.db, self.uid, self.password, model, signal, id)
        return r

    def model(self, model):
        """
        .. deprecated:: 8.0
            Use the registry and cursor in :data:`request` instead.

        Get an RPC proxy for the object ``model``, bound to this session.

        :param model: an OpenERP model name
        :type model: str
        :rtype: a model object
        """
        if not self.db:
            raise SessionExpiredException("Session expired")

        return Model(self, model)

    def save_action(self, action):
        """
        This method store an action object in the session and returns an integer
        identifying that action. The method get_action() can be used to get
        back the action.

        :param the_action: The action to save in the session.
        :type the_action: anything
        :return: A key identifying the saved action.
        :rtype: integer
        """
        saved_actions = self.setdefault('saved_actions', {"next": 1, "actions": {}})
        # we don't allow more than 10 stored actions
        if len(saved_actions["actions"]) >= 10:
            del saved_actions["actions"][min(saved_actions["actions"])]
        key = saved_actions["next"]
        saved_actions["actions"][key] = action
        saved_actions["next"] = key + 1
        self.modified = True
        return key

    def get_action(self, key):
        """
        Gets back a previously saved action. This method can return None if the action
        was saved since too much time (this case should be handled in a smart way).

        :param key: The key given by save_action()
        :type key: integer
        :return: The saved action or None.
        :rtype: anything
        """
        saved_actions = self.get('saved_actions', {})
        return saved_actions.get("actions", {}).get(key)

def session_gc(session_store):
    if random.random() < 0.001:
        # we keep session one week
        last_week = time.time() - 60*60*24*7
        for fname in os.listdir(session_store.path):
            path = os.path.join(session_store.path, fname)
            try:
                if os.path.getmtime(path) < last_week:
                    os.unlink(path)
            except OSError:
                pass

#----------------------------------------------------------
# WSGI Layer
#----------------------------------------------------------
# Add potentially missing (older ubuntu) font mime types
mimetypes.add_type('application/font-woff', '.woff')
mimetypes.add_type('application/vnd.ms-fontobject', '.eot')
mimetypes.add_type('application/x-font-ttf', '.ttf')

class Response(werkzeug.wrappers.Response):
    """ Response object passed through controller route chain.

    In addition to the :class:`werkzeug.wrappers.Response` parameters, this
    class's constructor can take the following additional parameters
    for QWeb Lazy Rendering.

    :param basestring template: template to render
    :param dict qcontext: Rendering context to use
    :param int uid: User id to use for the ir.ui.view render call,
                    ``None`` to use the request's user (the default)

    these attributes are available as parameters on the Response object and
    can be altered at any time before rendering

    Also exposes all the attributes and methods of
    :class:`werkzeug.wrappers.Response`.
    """
    default_mimetype = 'text/html'
    def __init__(self, *args, **kw):
        template = kw.pop('template', None)
        qcontext = kw.pop('qcontext', None)
        uid = kw.pop('uid', None)
        super(Response, self).__init__(*args, **kw)
        self.set_default(template, qcontext, uid)

    def set_default(self, template=None, qcontext=None, uid=None):
        self.template = template
        self.qcontext = qcontext or dict()
        self.uid = uid
        # Support for Cross-Origin Resource Sharing
        if request.endpoint and 'cors' in request.endpoint.routing:
            self.headers.set('Access-Control-Allow-Origin', request.endpoint.routing['cors'])
            methods = 'GET, POST'
            if request.endpoint.routing['type'] == 'json':
                methods = 'POST'
            elif request.endpoint.routing.get('methods'):
                methods = ', '.join(request.endpoint.routing['methods'])
            self.headers.set('Access-Control-Allow-Methods', methods)

    @property
    def is_qweb(self):
        return self.template is not None

    def render(self):
        """ Renders the Response's template, returns the result
        """
        view_obj = request.registry["ir.ui.view"]
        uid = self.uid or request.uid or openerp.SUPERUSER_ID
        return view_obj.render(
            request.cr, uid, self.template, self.qcontext,
            context=request.context)

    def flatten(self):
        """ Forces the rendering of the response's template, sets the result
        as response body and unsets :attr:`.template`
        """
        self.response.append(self.render())
        self.template = None

class DisableCacheMiddleware(object):
    def __init__(self, app):
        self.app = app
    def __call__(self, environ, start_response):
        def start_wrapped(status, headers):
            referer = environ.get('HTTP_REFERER', '')
            parsed = urlparse.urlparse(referer)
            debug = parsed.query.count('debug') >= 1

            new_headers = []
            unwanted_keys = ['Last-Modified']
            if debug:
                new_headers = [('Cache-Control', 'no-cache')]
                unwanted_keys += ['Expires', 'Etag', 'Cache-Control']

            for k, v in headers:
                if k not in unwanted_keys:
                    new_headers.append((k, v))

            start_response(status, new_headers)
        return self.app(environ, start_wrapped)

class Root(object):
    """Root WSGI application for the OpenERP Web Client.
    """
    def __init__(self):
        self._loaded = False

    @lazy_property
    def session_store(self):
        # Setup http sessions
        path = openerp.tools.config.session_dir
        _logger.debug('HTTP sessions stored in: %s', path)
        return werkzeug.contrib.sessions.FilesystemSessionStore(path, session_class=OpenERPSession)

    @lazy_property
    def nodb_routing_map(self):
        _logger.info("Generating nondb routing")
        return routing_map([''] + openerp.conf.server_wide_modules, True)

    def __call__(self, environ, start_response):
        """ Handle a WSGI request
        """
        if not self._loaded:
            self._loaded = True
            self.load_addons()
        return self.dispatch(environ, start_response)

    def load_addons(self):
        """ Load all addons from addons path containing static files and
        controllers and configure them.  """
        # TODO should we move this to ir.http so that only configured modules are served ?
        statics = {}

        for addons_path in openerp.modules.module.ad_paths:
            for module in sorted(os.listdir(str(addons_path))):
                if module not in addons_module:
                    manifest_path = os.path.join(addons_path, module, '__openerp__.py')
                    path_static = os.path.join(addons_path, module, 'static')
                    if os.path.isfile(manifest_path) and os.path.isdir(path_static):
                        manifest = ast.literal_eval(open(manifest_path).read())
                        manifest['addons_path'] = addons_path
                        _logger.debug("Loading %s", module)
                        if 'openerp.addons' in sys.modules:
                            m = __import__('openerp.addons.' + module)
                        else:
                            m = None
                        addons_module[module] = m
                        addons_manifest[module] = manifest
                        statics['/%s/static' % module] = path_static

        if statics:
            _logger.info("HTTP Configuring static files")
        app = werkzeug.wsgi.SharedDataMiddleware(self.dispatch, statics, cache_timeout=STATIC_CACHE)
        self.dispatch = DisableCacheMiddleware(app)

    def setup_session(self, httprequest):
        # recover or create session
        session_gc(self.session_store)

        sid = httprequest.args.get('session_id')
        explicit_session = True
        if not sid:
            sid =  httprequest.headers.get("X-Openerp-Session-Id")
        if not sid:
            sid = httprequest.cookies.get('session_id')
            explicit_session = False
        if sid is None:
            httprequest.session = self.session_store.new()
        else:
            httprequest.session = self.session_store.get(sid)
        return explicit_session

    def setup_db(self, httprequest):
        db = httprequest.session.db
        # Check if session.db is legit
        if db:
            if db not in db_filter([db], httprequest=httprequest):
                _logger.warn("Logged into database '%s', but dbfilter "
                             "rejects it; logging session out.", db)
                httprequest.session.logout()
                db = None

        if not db:
            httprequest.session.db = db_monodb(httprequest)

    def setup_lang(self, httprequest):
        if not "lang" in httprequest.session.context:
            lang = httprequest.accept_languages.best or "en_US"
            lang = babel.core.LOCALE_ALIASES.get(lang, lang).replace('-', '_')
            httprequest.session.context["lang"] = lang

    def get_request(self, httprequest):
        # deduce type of request
        if httprequest.args.get('jsonp'):
            return JsonRequest(httprequest)
        if httprequest.mimetype in ("application/json", "application/json-rpc"):
            return JsonRequest(httprequest)
        else:
            return HttpRequest(httprequest)

    def get_response(self, httprequest, result, explicit_session):
        if isinstance(result, Response) and result.is_qweb:
            try:
                result.flatten()
            except(Exception), e:
                if request.db:
                    result = request.registry['ir.http']._handle_exception(e)
                else:
                    raise

        if isinstance(result, basestring):
            response = Response(result, mimetype='text/html')
        else:
            response = result

        if httprequest.session.should_save:
            self.session_store.save(httprequest.session)
        # We must not set the cookie if the session id was specified using a http header or a GET parameter.
        # There are two reasons to this:
        # - When using one of those two means we consider that we are overriding the cookie, which means creating a new
        #   session on top of an already existing session and we don't want to create a mess with the 'normal' session
        #   (the one using the cookie). That is a special feature of the Session Javascript class.
        # - It could allow session fixation attacks.
        if not explicit_session and hasattr(response, 'set_cookie'):
            response.set_cookie('session_id', httprequest.session.sid, max_age=90 * 24 * 60 * 60)

        return response

    def dispatch(self, environ, start_response):
        """
        Performs the actual WSGI dispatching for the application.
        """
        try:
            httprequest = werkzeug.wrappers.Request(environ)
            httprequest.app = self

            explicit_session = self.setup_session(httprequest)
            self.setup_db(httprequest)
            self.setup_lang(httprequest)

            request = self.get_request(httprequest)

            def _dispatch_nodb():
                try:
                    func, arguments = self.nodb_routing_map.bind_to_environ(request.httprequest.environ).match()
                except werkzeug.exceptions.HTTPException, e:
                    return request._handle_exception(e)
                request.set_handler(func, arguments, "none")
                result = request.dispatch()
                return result

            with request:
                db = request.session.db
                if db:
                    openerp.modules.registry.RegistryManager.check_registry_signaling(db)
                    try:
                        with openerp.tools.mute_logger('openerp.sql_db'):
                            ir_http = request.registry['ir.http']
                    except (AttributeError, psycopg2.OperationalError):
                        # psycopg2 error or attribute error while constructing
                        # the registry. That means the database probably does
                        # not exists anymore or the code doesnt match the db.
                        # Log the user out and fall back to nodb
                        request.session.logout()
                        result = _dispatch_nodb()
                    else:
                        result = ir_http._dispatch()
                        openerp.modules.registry.RegistryManager.signal_caches_change(db)
                else:
                    result = _dispatch_nodb()

                response = self.get_response(httprequest, result, explicit_session)
            return response(environ, start_response)

        except werkzeug.exceptions.HTTPException, e:
            return e(environ, start_response)

    def get_db_router(self, db):
        if not db:
            return self.nodb_routing_map
        return request.registry['ir.http'].routing_map()

def db_list(force=False, httprequest=None):
    dbs = dispatch_rpc("db", "list", [force])
    return db_filter(dbs, httprequest=httprequest)

def db_filter(dbs, httprequest=None):
    httprequest = httprequest or request.httprequest
    h = httprequest.environ.get('HTTP_HOST', '').split(':')[0]
    d, _, r = h.partition('.')
    if d == "www" and r:
        d = r.partition('.')[0]
    r = openerp.tools.config['dbfilter'].replace('%h', h).replace('%d', d)
    dbs = [i for i in dbs if re.match(r, i)]
    return dbs

def db_monodb(httprequest=None):
    """
        Magic function to find the current database.

        Implementation details:

        * Magic
        * More magic

        Returns ``None`` if the magic is not magic enough.
    """
    httprequest = httprequest or request.httprequest

    dbs = db_list(True, httprequest)

    # try the db already in the session
    db_session = httprequest.session.db
    if db_session in dbs:
        return db_session

    # if there is only one possible db, we take that one
    if len(dbs) == 1:
        return dbs[0]
    return None

def send_file(filepath_or_fp, mimetype=None, as_attachment=False, filename=None, mtime=None,
              add_etags=True, cache_timeout=STATIC_CACHE, conditional=True):
    """This is a modified version of Flask's send_file()

    Sends the contents of a file to the client. This will use the
    most efficient method available and configured.  By default it will
    try to use the WSGI server's file_wrapper support.

    By default it will try to guess the mimetype for you, but you can
    also explicitly provide one.  For extra security you probably want
    to send certain files as attachment (HTML for instance).  The mimetype
    guessing requires a `filename` or an `attachment_filename` to be
    provided.

    Please never pass filenames to this function from user sources without
    checking them first.

    :param filepath_or_fp: the filename of the file to send.
                           Alternatively a file object might be provided
                           in which case `X-Sendfile` might not work and
                           fall back to the traditional method.  Make sure
                           that the file pointer is positioned at the start
                           of data to send before calling :func:`send_file`.
    :param mimetype: the mimetype of the file if provided, otherwise
                     auto detection happens.
    :param as_attachment: set to `True` if you want to send this file with
                          a ``Content-Disposition: attachment`` header.
    :param filename: the filename for the attachment if it differs from the file's filename or
                     if using file object without 'name' attribute (eg: E-tags with StringIO).
    :param mtime: last modification time to use for contitional response.
    :param add_etags: set to `False` to disable attaching of etags.
    :param conditional: set to `False` to disable conditional responses.

    :param cache_timeout: the timeout in seconds for the headers.
    """
    if isinstance(filepath_or_fp, (str, unicode)):
        if not filename:
            filename = os.path.basename(filepath_or_fp)
        file = open(filepath_or_fp, 'rb')
        if not mtime:
            mtime = os.path.getmtime(filepath_or_fp)
    else:
        file = filepath_or_fp
        if not filename:
            filename = getattr(file, 'name', None)

    file.seek(0, 2)
    size = file.tell()
    file.seek(0)

    if mimetype is None and filename:
        mimetype = mimetypes.guess_type(filename)[0]
    if mimetype is None:
        mimetype = 'application/octet-stream'

    headers = werkzeug.datastructures.Headers()
    if as_attachment:
        if filename is None:
            raise TypeError('filename unavailable, required for sending as attachment')
        headers.add('Content-Disposition', 'attachment', filename=filename)
        headers['Content-Length'] = size

    data = wrap_file(request.httprequest.environ, file)
    rv = Response(data, mimetype=mimetype, headers=headers,
                                    direct_passthrough=True)

    if isinstance(mtime, str):
        try:
            server_format = openerp.tools.misc.DEFAULT_SERVER_DATETIME_FORMAT
            mtime = datetime.datetime.strptime(mtime.split('.')[0], server_format)
        except Exception:
            mtime = None
    if mtime is not None:
        rv.last_modified = mtime

    rv.cache_control.public = True
    if cache_timeout:
        rv.cache_control.max_age = cache_timeout
        rv.expires = int(time.time() + cache_timeout)

    if add_etags and filename and mtime:
        rv.set_etag('odoo-%s-%s-%s' % (
            mtime,
            size,
            adler32(
                filename.encode('utf-8') if isinstance(filename, unicode)
                else filename
            ) & 0xffffffff
        ))
        if conditional:
            rv = rv.make_conditional(request.httprequest)
            # make sure we don't send x-sendfile for servers that
            # ignore the 304 status code for x-sendfile.
            if rv.status_code == 304:
                rv.headers.pop('x-sendfile', None)
    return rv

#----------------------------------------------------------
# RPC controller
#----------------------------------------------------------
class CommonController(Controller):

    @route('/jsonrpc', type='json', auth="none")
    def jsonrpc(self, service, method, args):
        """ Method used by client APIs to contact OpenERP. """
        return dispatch_rpc(service, method, args)

    @route('/gen_session_id', type='json', auth="none")
    def gen_session_id(self):
        nsession = root.session_store.new()
        return nsession.sid

# register main wsgi handler
root = Root()
openerp.service.wsgi_server.register_wsgi_handler(root)

# vim:et:ts=4:sw=4: