web/views/idownloadable.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 12 Jul 2010 14:11:09 +0200
changeset 5963 4d75f743ed49
parent 5877 0c7b7b76a84f
child 5986 8339d4739f7f
permissions -rw-r--r--
[actions] homogen action/view selectors. Move action together with associated view to avoid such thing in the future
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# copyright 2003-2010 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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"""Specific views for entities adapting to IDownloadable"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from logilab.mtconverter import BINARY_ENCODINGS, TransformError, xml_escape
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from cubicweb.view import EntityView
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from cubicweb.selectors import (one_line_rset, is_instance, match_context_prop,
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                                adaptable, has_mimetype)
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from cubicweb.mttransforms import ENGINE
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from cubicweb.web import box, httpcache
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from cubicweb.web.views import primary, baseviews
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def download_box(w, entity, title=None, label=None, footer=u''):
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    req = entity._cw
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    w(u'<div class="sideBox">')
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    if title is None:
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        title = req._('download')
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    w(u'<div class="sideBoxTitle downloadBoxTitle"><span>%s</span></div>'
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      % xml_escape(title))
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    w(u'<div class="sideBox downloadBox"><div class="sideBoxBody">')
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    w(u'<a href="%s"><img src="%s" alt="%s"/> %s</a>'
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      % (xml_escape(entity.cw_adapt_to('IDownloadable').download_url()),
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         req.uiprops['DOWNLOAD_ICON'],
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         _('download icon'), xml_escape(label or entity.dc_title())))
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    w(u'%s</div>' % footer)
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    w(u'</div></div>\n')
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class DownloadBox(box.EntityBoxTemplate):
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    __regid__ = 'download_box'
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    # no download box for images
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    # XXX primary_view selector ?
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    __select__ = (one_line_rset() & match_context_prop()
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                  & adaptable('IDownloadable') & ~has_mimetype('image/'))
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    order = 10
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    def cell_call(self, row, col, title=None, label=None, **kwargs):
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        entity = self.cw_rset.get_entity(row, col)
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        download_box(self.w, entity, title, label)
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class DownloadView(EntityView):
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    """this view is replacing the deprecated 'download' controller and allow
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    downloading of entities providing the necessary interface
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    """
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    __regid__ = 'download'
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    __select__ = one_line_rset() & adaptable('IDownloadable')
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    templatable = False
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    content_type = 'application/octet-stream'
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    binary = True
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    http_cache_manager = httpcache.EntityHTTPCacheManager
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    add_to_breadcrumbs = False
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    def set_request_content_type(self):
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        """overriden to set the correct filetype and filename"""
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        entity = self.cw_rset.complete_entity(self.cw_row or 0, self.cw_col or 0)
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        adapter = entity.cw_adapt_to('IDownloadable')
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        encoding = adapter.download_encoding()
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        if encoding in BINARY_ENCODINGS:
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            contenttype = 'application/%s' % encoding
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            encoding = None
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        else:
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            contenttype = adapter.download_content_type()
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        self._cw.set_content_type(contenttype or self.content_type,
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                                  filename=adapter.download_file_name(),
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                                  encoding=encoding)
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    def call(self):
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        entity = self.cw_rset.complete_entity(self.cw_row or 0, self.cw_col or 0)
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        adapter = entity.cw_adapt_to('IDownloadable')
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        self.w(adapter.download_data())
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    def last_modified(self):
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        return self.cw_rset.get_entity(self.cw_row or 0, self.cw_col or 0).modification_date
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class DownloadLinkView(EntityView):
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    """view displaying a link to download the file"""
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    __regid__ = 'downloadlink'
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    __select__ = adaptable('IDownloadable')
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    title = None # should not be listed in possible views
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    def cell_call(self, row, col, title=None, **kwargs):
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        entity = self.cw_rset.get_entity(row, col)
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        url = xml_escape(entity.cw_adapt_to('IDownloadable').download_url())
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        self.w(u'<a href="%s">%s</a>' % (url, xml_escape(title or entity.dc_title())))
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class IDownloadablePrimaryView(primary.PrimaryView):
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    __select__ = adaptable('IDownloadable')
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    def render_entity_attributes(self, entity):
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        super(IDownloadablePrimaryView, self).render_entity_attributes(entity)
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        self.w(u'<div class="content">')
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        adapter = entity.cw_adapt_to('IDownloadable')
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        contenttype = adapter.download_content_type()
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        if contenttype.startswith('image/'):
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            self.wview('image', entity.cw_rset, row=entity.cw_row)
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        else:
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            self.wview('downloadlink', entity.cw_rset, title=self._cw._('download'), row=entity.cw_row)
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            self.render_data(entity, contenttype, 'text/html')
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        self.w(u'</div>')
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    def render_data(self, entity, sourcemt, targetmt):
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        adapter = entity.cw_adapt_to('IDownloadable')
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        if ENGINE.find_path(sourcemt, targetmt):
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            try:
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                self.w(entity._cw_mtc_transform(adapter.download_data(), sourcemt,
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                                                targetmt, adapter.download_encoding()))
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            except Exception, ex:
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                self.exception('while rendering data for %s', entity)
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                msg = self._cw._("can't display data, unexpected error: %s") \
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                      % xml_escape(unicode(ex))
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                self.w('<div class="error">%s</div>' % msg)
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            return True
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        return False
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class IDownloadableLineView(baseviews.OneLineView):
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    __select__ = adaptable('IDownloadable')
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    def cell_call(self, row, col, title=None, **kwargs):
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        """the oneline view is a link to download the file"""
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        entity = self.cw_rset.get_entity(row, col)
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        url = xml_escape(entity.absolute_url())
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        adapter = entity.cw_adapt_to('IDownloadable')
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        name = xml_escape(title or adapter.download_file_name())
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        durl = xml_escape(adapter.download_url())
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        self.w(u'<a href="%s">%s</a> [<a href="%s">%s</a>]' %
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               (url, name, durl, self._cw._('download')))
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class ImageView(EntityView):
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    __regid__ = 'image'
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    __select__ = has_mimetype('image/')
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    title = _('image')
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    def call(self):
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        rset = self.cw_rset
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        for i in xrange(len(rset)):
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            self.w(u'<div class="efile">')
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            self.wview(self.__regid__, rset, row=i, col=0)
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            self.w(u'</div>')
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    def cell_call(self, row, col, width=None, height=None, link=False):
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        entity = self.cw_rset.get_entity(row, col)
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        adapter = entity.cw_adapt_to('IDownloadable')
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        #if entity.data_format.startswith('image/'):
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        imgtag = u'<img src="%s" alt="%s" ' % (
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            xml_escape(adapter.download_url()),
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            (self._cw._('download %s')  % xml_escape(adapter.download_file_name())))
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        if width:
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            imgtag += u'width="%i" ' % width
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        if height:
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            imgtag += u'height="%i" ' % height
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        imgtag += u'/>'
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        if link:
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            self.w(u'<a href="%s">%s</a>' % (entity.absolute_url(vid='download'),
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                                             imgtag))
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        else:
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            self.w(imgtag)
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