web/views/xmlrss.py
author sylvain.thenault@logilab.fr
Fri, 20 Feb 2009 01:14:46 +0100
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child 1091 b5e253c0dd13
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"""base xml and rss views
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:organization: Logilab
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:copyright: 2001-2009 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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__docformat__ = "restructuredtext en"
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from time import timezone
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from logilab.mtconverter import xml_escape
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from cubicweb.view import EntityView, AnyRsetView
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from cubicweb.web.httpcache import MaxAgeHTTPCacheManager
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from cubicweb.common.uilib import simple_sgml_tag
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class XmlView(EntityView):
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    """xml view for entities"""
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    id = 'xml'
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    title = _('xml')
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    templatable = False
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    content_type = 'text/xml'
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    xml_root = 'rset'
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    item_vid = 'xmlitem'
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    def cell_call(self, row, col):
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        self.wview(self.item_vid, self.rset, row=row, col=col)
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    def call(self):
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        """display a list of entities by calling their <item_vid> view"""
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        self.w(u'<?xml version="1.0" encoding="%s"?>\n' % self.req.encoding)
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        self.w(u'<%s size="%s">\n' % (self.xml_root, len(self.rset)))
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        for i in xrange(self.rset.rowcount):
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            self.cell_call(i, 0)
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        self.w(u'</%s>\n' % self.xml_root)
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class XmlItemView(EntityView):
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    id = 'xmlitem'
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    def cell_call(self, row, col):
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        """ element as an item for an xml feed """
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        entity = self.complete_entity(row, col)
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        self.w(u'<%s>\n' % (entity.e_schema))
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        for rschema, attrschema in entity.e_schema.attribute_definitions():
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            attr = rschema.type
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            try:
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                value = entity[attr]
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            except KeyError:
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                # Bytes
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                continue
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            if value is not None:
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                if attrschema == 'Bytes':
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                    from base64 import b64encode
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                    value = '<![CDATA[%s]]>' % b64encode(value.getvalue())
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                elif isinstance(value, basestring):
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                    value = xml_escape(value)
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                self.w(u'  <%s>%s</%s>\n' % (attr, value, attr))
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        self.w(u'</%s>\n' % (entity.e_schema))
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class XmlRsetView(AnyRsetView):
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    """dumps raw rset as xml"""
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    id = 'rsetxml'
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    title = _('xml export')
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    templatable = False
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    content_type = 'text/xml'
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    xml_root = 'rset'
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    def call(self):
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        w = self.w
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        rset, descr = self.rset, self.rset.description
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        eschema = self.schema.eschema
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        labels = self.columns_labels(False)
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        w(u'<?xml version="1.0" encoding="%s"?>\n' % self.req.encoding)
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        w(u'<%s query="%s">\n' % (self.xml_root, xml_escape(rset.printable_rql())))
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        for rowindex, row in enumerate(self.rset):
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            w(u' <row>\n')
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            for colindex, val in enumerate(row):
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                etype = descr[rowindex][colindex]
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                tag = labels[colindex]
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                attrs = {}
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                if '(' in tag:
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                    attrs['expr'] = tag
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                    tag = 'funccall'
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                if val is not None and not eschema(etype).is_final():
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                    attrs['eid'] = val
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                    # csvrow.append(val) # val is eid in that case
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                    val = self.view('textincontext', rset,
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                                    row=rowindex, col=colindex)
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                else:
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                    val = self.view('final', rset, displaytime=True,
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                                    row=rowindex, col=colindex, format='text/plain')
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                w(simple_sgml_tag(tag, val, **attrs))
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            w(u' </row>\n')
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        w(u'</%s>\n' % self.xml_root)
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class RssView(XmlView):
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    id = 'rss'
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    title = _('rss')
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    templatable = False
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    content_type = 'text/xml'
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    http_cache_manager = MaxAgeHTTPCacheManager
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    cache_max_age = 60*60*2 # stay in http cache for 2 hours by default 
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    def cell_call(self, row, col):
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        self.wview('rssitem', self.rset, row=row, col=col)
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    def call(self):
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        """display a list of entities by calling their <item_vid> view"""
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        req = self.req
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        self.w(u'<?xml version="1.0" encoding="%s"?>\n' % req.encoding)
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        self.w(u'''<rdf:RDF
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 xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
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 xmlns:dc="http://purl.org/dc/elements/1.1/"
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 xmlns="http://purl.org/rss/1.0/"
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>''')
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        self.w(u'  <channel rdf:about="%s">\n' % xml_escape(req.url()))
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        self.w(u'    <title>%s RSS Feed</title>\n' % xml_escape(self.page_title()))
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        self.w(u'    <description>%s</description>\n' % xml_escape(req.form.get('vtitle', '')))
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        params = req.form.copy()
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        params.pop('vid', None)
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        self.w(u'    <link>%s</link>\n' % xml_escape(self.build_url(**params)))
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        self.w(u'    <items>\n')
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        self.w(u'      <rdf:Seq>\n')
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        for entity in self.rset.entities():
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            self.w(u'      <rdf:li resource="%s" />\n' % xml_escape(entity.absolute_url()))
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        self.w(u'      </rdf:Seq>\n')
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        self.w(u'    </items>\n')
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        self.w(u'  </channel>\n')
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        for i in xrange(self.rset.rowcount):
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            self.cell_call(i, 0)
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        self.w(u'</rdf:RDF>')
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class RssItemView(EntityView):
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    id = 'rssitem'
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    date_format = '%%Y-%%m-%%dT%%H:%%M%+03i:00' % (timezone / 3600)
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    def cell_call(self, row, col):
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        entity = self.complete_entity(row, col)
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        self.w(u'<item rdf:about="%s">\n' % xml_escape(entity.absolute_url()))
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        self._marker('title', entity.dc_long_title())
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        self._marker('link', entity.absolute_url())
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        self._marker('description', entity.dc_description())
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        self._marker('dc:date', entity.dc_date(self.date_format))
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        if entity.creator:
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            self.w(u'<author>')
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            self._marker('name', entity.creator.name())
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            email = entity.creator.get_email()
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            if email:
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                self._marker('email', email)
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            self.w(u'</author>')
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        self.w(u'</item>\n')
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    def _marker(self, marker, value):
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        if value:
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            self.w(u'  <%s>%s</%s>\n' % (marker, xml_escape(value), marker))