web/views/json.py
author Damien Garaud <damien.garaud@logilab.fr>
Fri, 08 Aug 2014 13:05:07 +0200
changeset 9977 e48e5a597ccc
parent 9492 c7fc56eecd1a
child 10013 b68088082280
permissions -rw-r--r--
[views] csvexport accept an empty rset (closes #4236928) When you tried to apply the 'csvexport' view on an empty rset, the view couldn't be selected and you got a HTTP 500 error. Also add two new test cases.
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# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""json export views"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from cubicweb.utils import json_dumps
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from cubicweb.predicates import any_rset
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from cubicweb.view import EntityView, AnyRsetView
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from cubicweb.web.application import anonymized_request
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from cubicweb.web.views import basecontrollers
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class JsonpController(basecontrollers.ViewController):
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    """The jsonp controller is the same as a ViewController but :
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    - anonymize request (avoid CSRF attacks)
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    - if ``vid`` parameter is passed, make sure it's sensible (i.e. either
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      "jsonexport" or "ejsonexport")
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    - if ``callback`` request parameter is passed, it's used as json padding
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    Response's content-type will either be ``application/javascript`` or
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    ``application/json`` depending on ``callback`` parameter presence or not.
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    """
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    __regid__ = 'jsonp'
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    def publish(self, rset=None):
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        if 'vid' in self._cw.form:
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            vid = self._cw.form['vid']
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            if vid not in ('jsonexport', 'ejsonexport'):
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                self.warning("vid %s can't be used with jsonp controller, "
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                             "falling back to jsonexport", vid)
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                self._cw.form['vid'] = 'jsonexport'
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        else: # if no vid is specified, use jsonexport
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            self._cw.form['vid'] = 'jsonexport'
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        if self._cw.vreg.config['anonymize-jsonp-queries']:
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            with anonymized_request(self._cw):
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                return self._get_json_data(rset)
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        else:
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            return self._get_json_data(rset)
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    def _get_json_data(self, rset):
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        json_data = super(JsonpController, self).publish(rset)
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        if 'callback' in self._cw.form: # jsonp
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            json_padding = self._cw.form['callback']
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            # use ``application/javascript`` is ``callback`` parameter is
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            # provided, let ``application/json`` otherwise
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            self._cw.set_content_type('application/javascript')
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            json_data = '%s(%s)' % (json_padding, json_data)
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        return json_data
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class JsonMixIn(object):
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    """mixin class for json views
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    Handles the following optional request parameters:
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    - ``_indent`` : must be an integer. If found, it is used to pretty print
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      json output
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    """
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    templatable = False
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    content_type = 'application/json'
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    binary = True
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    def wdata(self, data):
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        if '_indent' in self._cw.form:
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            indent = int(self._cw.form['_indent'])
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        else:
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            indent = None
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        self.w(json_dumps(data, indent=indent))
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class JsonRsetView(JsonMixIn, AnyRsetView):
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    """dumps raw result set in JSON format"""
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    __regid__ = 'jsonexport'
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    __select__ = any_rset() # means rset might be empty or have any shape
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    title = _('json-export-view')
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    def call(self):
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        # XXX mimic w3c recommandations to serialize SPARQL results in json?
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        #     http://www.w3.org/TR/rdf-sparql-json-res/
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        self.wdata(self.cw_rset.rows)
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class JsonEntityView(JsonMixIn, EntityView):
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    """dumps rset entities in JSON
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    The following additional metadata is added to each row :
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    - ``__cwetype__`` : entity type
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    """
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    __regid__ = 'ejsonexport'
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    title = _('json-entities-export-view')
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    def call(self):
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        entities = []
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        for entity in self.cw_rset.entities():
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            entity.complete() # fetch all attributes
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            # hack to add extra metadata
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            entity.cw_attr_cache.update({
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                    '__cwetype__': entity.cw_etype,
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                    })
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            entities.append(entity)
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        self.wdata(entities)