web/views/idownloadable.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
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"""Specific views for entities implementing IDownloadable
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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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, score_entity,
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                                implements, match_context_prop)
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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.web.box import EntityBoxTemplate
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from cubicweb.web.views import primary, baseviews
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def is_image(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 download_box(w, entity, title=None, label=None):
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    req = entity.req
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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.download_url()),
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         req.external_resource('DOWNLOAD_ICON'),
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         _('download icon'), xml_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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    # no download box for images
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    # XXX primary_view selector ?
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    __select__ = (one_line_rset() & implements(IDownloadable) &
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                  match_context_prop() & ~score_entity(is_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.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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    id = 'download'
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    __select__ = one_line_rset() & implements(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(EntityView):
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    """view displaying a link to download the file"""
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    id = 'downloadlink'
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    __select__ = implements(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.rset.get_entity(row, col)
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        url = xml_escape(entity.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__ = implements(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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        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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            self.wview('downloadlink', entity.rset, title=self.req._('download'), row=entity.row)
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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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class IDownloadableLineView(baseviews.OneLineView):
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    __select__ = implements(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.rset.get_entity(row, col)
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        url = xml_escape(entity.absolute_url())
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        name = xml_escape(title or entity.download_file_name())
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        durl = xml_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(EntityView):
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    id = 'image'
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    __select__ = implements(IDownloadable) & score_entity(is_image)
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    title = _('image')
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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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    def cell_call(self, row, col, width=None, height=None, link=False):
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        entity = self.rset.get_entity(row, col)
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        #if entity.data_format.startswith('image/'):
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        imgtag = u'<img src="%s" alt="%s" ' % (xml_escape(entity.download_url()),
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                                               xml_escape(entity.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" alt="%s">%s</a>' % (entity.absolute_url(vid='download'),
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                                                      self.req._('download image'),
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                                                      imgtag))
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        else:
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            self.w(imgtag)
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