1 files changed, 77 insertions, 0 deletions
diff --git a/webapp/django/contrib/admin/views/template.py b/webapp/django/contrib/admin/views/template.py
new file mode 100644
index 0000000000..de9320bfc2
--- /dev/null
+++ b/webapp/django/contrib/admin/views/template.py
@@ -0,0 +1,77 @@
+from django import template, forms
+from django.contrib.admin.views.decorators import staff_member_required
+from django.template import loader
+from django.shortcuts import render_to_response
+from django.contrib.sites.models import Site
+from django.conf import settings
+from django.utils.translation import ugettext_lazy as _
+
+
+def template_validator(request):
+    """
+    Displays the template validator form, which finds and displays template
+    syntax errors.
+    """
+    # get a dict of {site_id : settings_module} for the validator
+    settings_modules = {}
+    for mod in settings.ADMIN_FOR:
+        settings_module = __import__(mod, {}, {}, [''])
+        settings_modules[settings_module.SITE_ID] = settings_module
+    site_list = Site.objects.in_bulk(settings_modules.keys()).values()
+    if request.POST:
+        form = TemplateValidatorForm(settings_modules, site_list,
+                                     data=request.POST)
+        if form.is_valid():
+            request.user.message_set.create(message='The template is valid.')
+    else:
+        form = TemplateValidatorForm(settings_modules, site_list)
+    return render_to_response('admin/template_validator.html', {
+        'title': 'Template validator',
+        'form': form,
+    }, context_instance=template.RequestContext(request))
+template_validator = staff_member_required(template_validator)
+
+
+class TemplateValidatorForm(forms.Form):
+    site = forms.ChoiceField(_('site'))
+    template = forms.CharField(
+        _('template'), widget=forms.Textarea({'rows': 25, 'cols': 80}))
+
+    def __init__(self, settings_modules, site_list, *args, **kwargs):
+        self.settings_modules = settings_modules
+        super(TemplateValidatorForm, self).__init__(*args, **kwargs)
+        self.fields['site'].choices = [(s.id, s.name) for s in site_list]
+
+    def clean_template(self):
+        # Get the settings module. If the site isn't set, we don't raise an
+        # error since the site field will.
+        try:
+            site_id = int(self.cleaned_data.get('site', None))
+        except (ValueError, TypeError):
+            return
+        settings_module = self.settings_modules.get(site_id, None)
+        if settings_module is None:
+            return
+
+        # So that inheritance works in the site's context, register a new
+        # function for "extends" that uses the site's TEMPLATE_DIRS instead.
+        def new_do_extends(parser, token):
+            node = loader.do_extends(parser, token)
+            node.template_dirs = settings_module.TEMPLATE_DIRS
+            return node
+        register = template.Library()
+        register.tag('extends', new_do_extends)
+        template.builtins.append(register)
+
+        # Now validate the template using the new TEMPLATE_DIRS, making sure to
+        # reset the extends function in any case.
+        error = None
+        template_string = self.cleaned_data['template']
+        try:
+            tmpl = loader.get_template_from_string(template_string)
+            tmpl.render(template.Context({}))
+        except template.TemplateSyntaxError, e:
+            error = e
+        template.builtins.remove(register)
+        if error:
+            raise forms.ValidationError, e.args