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# IVLE - Informatics Virtual Learning Environment
# Copyright (C) 2007-2009 The University of Melbourne
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# Author: Nick Chadwick
import inspect
import os.path
import urllib
import genshi.template
from ivle.webapp.media import media_url
from ivle.webapp.core import Plugin as CorePlugin
from ivle.webapp.base.views import BaseView
from ivle.webapp.base.plugins import ViewPlugin, OverlayPlugin
from ivle.webapp.errors import HTTPError, Unauthorized
class XHTMLView(BaseView):
"""
A view which provides a base class for views which need to return XHTML
It is expected that apps which use this view will be written using Genshi
templates.
"""
template = 'template.html'
plugin_scripts = {}
plugin_styles = {}
allow_overlays = True
overlay_blacklist = []
def __init__(self, req, **kwargs):
for key in kwargs:
setattr(self, key, kwargs[key])
def filter(self, stream, ctx):
return stream
def render(self, req):
req.content_type = 'text/html' # TODO: Detect application/xhtml+xml
# View template
viewctx = genshi.template.Context()
self.populate(req, viewctx)
# The template is found in the directory of the module containing the
# view.
app_template = os.path.join(os.path.dirname(
inspect.getmodule(self).__file__), self.template)
loader = genshi.template.TemplateLoader(".", auto_reload=True)
tmpl = loader.load(app_template)
app = self.filter(tmpl.generate(viewctx), viewctx)
for plugin in self.plugin_scripts:
for path in self.plugin_scripts[plugin]:
req.scripts.append(media_url(req, plugin, path))
for plugin in self.plugin_styles:
for path in self.plugin_styles[plugin]:
req.styles.append(media_url(req, plugin, path))
# Global template
ctx = genshi.template.Context()
# XXX: Leave this here!! (Before req.styles is read)
ctx['overlays'] = self.render_overlays(req) if req.user else []
ctx['styles'] = [media_url(req, CorePlugin, 'ivle.css')]
ctx['styles'] += req.styles
ctx['scripts'] = [media_url(req, CorePlugin, path) for path in
('util.js', 'json2.js', 'md5.js')]
ctx['scripts'].append(media_url(req, '+external/jquery', 'jquery.js'))
ctx['scripts'] += req.scripts
ctx['scripts_init'] = req.scripts_init
ctx['app_template'] = app
ctx['title_img'] = media_url(req, CorePlugin,
"images/chrome/title.png")
self.populate_headings(req, ctx)
tmpl = loader.load(os.path.join(os.path.dirname(__file__),
'ivle-headings.html'))
req.write(tmpl.generate(ctx).render('xhtml', doctype='xhtml'))
def populate(self, req, ctx):
raise NotImplementedError()
def populate_headings(self, req, ctx):
ctx['favicon'] = None
ctx['root_dir'] = req.config['urls']['root']
ctx['public_host'] = req.config['urls']['public_host']
ctx['svn_base'] = req.config['urls']['svn_addr']
ctx['write_javascript_settings'] = req.write_javascript_settings
if req.user:
ctx['login'] = req.user.login
ctx['logged_in'] = True
ctx['nick'] = req.user.nick
else:
ctx['login'] = None
ctx['logged_in'] = False
ctx['publicmode'] = req.publicmode
if hasattr(self, 'help'):
ctx['help_path'] = self.help
ctx['apps_in_tabs'] = []
for plugin in req.config.plugin_index[ViewPlugin]:
if not hasattr(plugin, 'tabs'):
continue
for tab in plugin.tabs:
# tab is a tuple: name, title, desc, icon, path
new_app = {}
new_app['this_app'] = hasattr(self, 'tab') \
and tab[0] == self.tab
# Icon name
if tab[3] is not None:
new_app['has_icon'] = True
icon_url = media_url(req, plugin, tab[3])
new_app['icon_url'] = icon_url
if new_app['this_app']:
ctx['favicon'] = icon_url
else:
new_app['has_icon'] = False
new_app['path'] = req.make_path(tab[4])
new_app['desc'] = tab[2]
new_app['name'] = tab[1]
new_app['weight'] = tab[5]
ctx['apps_in_tabs'].append(new_app)
ctx['apps_in_tabs'].sort(key=lambda tab: tab['weight'])
def render_overlays(self, req):
"""Generate XML streams for the overlays.
Returns a list of streams. Populates the scripts, styles, and
scripts_init.
"""
overlays = []
if not self.allow_overlays:
return overlays
for plugin in req.config.plugin_index[OverlayPlugin]:
for overclass in plugin.overlays:
if overclass in self.overlay_blacklist:
continue
overlay = overclass(req)
#TODO: Re-factor this to look nicer
for mplugin in overlay.plugin_scripts:
for path in overlay.plugin_scripts[mplugin]:
req.scripts.append(media_url(req, mplugin, path))
for mplugin in overlay.plugin_styles:
for path in overlay.plugin_styles[mplugin]:
req.styles.append(media_url(req, mplugin, path))
req.scripts_init += overlay.plugin_scripts_init
overlays.append(overlay.render(req))
return overlays
@classmethod
def get_error_view(cls, e):
view_map = {HTTPError: XHTMLErrorView,
Unauthorized: XHTMLUnauthorizedView}
for exccls in inspect.getmro(type(e)):
if exccls in view_map:
return view_map[exccls]
class XHTMLErrorView(XHTMLView):
template = 'xhtmlerror.html'
def __init__(self, req, exception):
self.context = exception
def populate(self, req, ctx):
ctx['exception'] = self.context
class XHTMLUnauthorizedView(XHTMLErrorView):
template = 'xhtmlunauthorized.html'
def __init__(self, req, exception):
super(XHTMLUnauthorizedView, self).__init__(req, exception)
if req.user is None:
# Not logged in. Redirect to login page.
if req.uri == '/':
query_string = ''
else:
query_string = '?url=' + urllib.quote(req.uri, safe="/~")
req.throw_redirect('/+login' + query_string)
req.status = 403
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