web/views/idownloadable.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
Mon, 05 Jan 2009 15:23:03 +0100
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add contextprop_selector to the DownloadBox so that it behaves like all other boxes
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"""Specific views for entities implementing IDownloadable
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:organization: Logilab
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:copyright: 2001-2008 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 logilab.mtconverter import BINARY_ENCODINGS, TransformError, html_escape
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from cubicweb.interfaces import IDownloadable
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from cubicweb.common.mttransforms import ENGINE
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from cubicweb.common.selectors import (one_line_rset, score_entity_selector,
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                                       interface_selector, contextprop_selector)
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from cubicweb.web.box import EntityBoxTemplate
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from cubicweb.web.views import baseviews
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_ = unicode
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def download_box(w, entity, title=None, label=None):
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    req = entity.req
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    w(u'<div class="sideRelated">')
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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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      % html_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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      % (html_escape(entity.download_url()),
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         req.external_resource('DOWNLOAD_ICON'),
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         _('download icon'), html_escape(label or entity.dc_title())))
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    w(u'</div>')
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    w(u'</div>\n</div>\n')
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class DownloadBox(EntityBoxTemplate):
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    id = 'download_box'
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    __selectors__ = (one_line_rset, interface_selector, contextprop_selector)
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    accepts_interfaces = (IDownloadable,)
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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.entity(row, col)
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        download_box(self.w, entity, title, label)
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class DownloadView(baseviews.EntityView):
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    """this view is replacing the deprecated 'download' controller and allow downloading
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    of entities providing the necessary interface
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    """
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    id = 'download'
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    __selectors__ = (one_line_rset, interface_selector)
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    accepts_interfaces = (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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    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.complete_entity(0)
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        encoding = entity.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 = entity.download_content_type()
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        self.req.set_content_type(contenttype or self.content_type,
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                                  filename=entity.download_file_name(),
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                                  encoding=encoding)
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    def call(self):
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        self.w(self.complete_entity(0).download_data())
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class DownloadLinkView(baseviews.EntityView):
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    """view displaying a link to download the file"""
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    id = 'downloadlink'
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    title = None # should not be listed in possible views
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    __selectors__ = (interface_selector,)
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    accepts_interfaces = (IDownloadable,)
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    def cell_call(self, row, col, title=None, **kwargs):
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        entity = self.entity(row, col)
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        url = html_escape(entity.download_url())
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        self.w(u'<a href="%s">%s</a>' % (url, html_escape(title or entity.dc_title())))
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class IDownloadablePrimaryView(baseviews.PrimaryView):
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    __selectors__ = (interface_selector,)
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    #skip_attrs = ('eid', 'data',) # XXX
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    accepts_interfaces = (IDownloadable,)
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    def render_entity_title(self, entity):
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        self.w(u'<h1>%s %s</h1>'
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               % (entity.dc_type().capitalize(),
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                  html_escape(entity.dc_title())))
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    def render_entity_attributes(self, entity, siderelations):
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        super(IDownloadablePrimaryView, self).render_entity_attributes(entity, siderelations)
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        self.wview('downloadlink', entity.rset, title=self.req._('download'), row=entity.row)
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        self.w(u'<div class="content">')
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        contenttype = entity.download_content_type()
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        if contenttype.startswith('image/'):
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            self.wview('image', entity.rset, row=entity.row)
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        else:
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            try:
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                if ENGINE.has_input(contenttype):
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                    self.w(entity.printable_value('data'))
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            except TransformError:
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                pass
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            except Exception, ex:
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                msg = self.req._("can't display data, unexpected error: %s") % ex
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                self.w('<div class="error">%s</div>' % msg)
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        self.w(u'</div>')
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    def is_side_related(self, rschema, eschema):
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        """display all relations as side related"""
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        return True
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class IDownloadableLineView(baseviews.OneLineView):
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    __selectors__ = (interface_selector,)
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    # don't kick default oneline view
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    accepts_interfaces = (IDownloadable,)
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    def cell_call(self, row, col, title=None, **kwargs):
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        """the secondary view is a link to download the file"""
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        entity = self.entity(row, col)
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        url = html_escape(entity.absolute_url())
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        name = html_escape(entity.download_file_name())
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        durl = html_escape(entity.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.req._('download')))
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class ImageView(baseviews.EntityView):
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    __selectors__ = (interface_selector, score_entity_selector)
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    id = 'image'
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    title = _('image')
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    accepts_interfaces = (IDownloadable,)
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    def call(self):
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        rset = self.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.id, rset, row=i, col=0)
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            self.w(u'</div>')
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    @classmethod
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    def score_entity(cls, entity):
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        mt = entity.download_content_type()
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        if not (mt and mt.startswith('image/')):
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            return 0
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        return 1
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    def cell_call(self, row, col):
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        entity = self.entity(row, col)
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        #if entity.data_format.startswith('image/'):
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        self.w(u'<img src="%s" alt="%s"/>' % (html_escape(entity.download_url()),
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                                              html_escape(entity.download_file_name())))
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