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CONNT-9: Reworked the entity details view to be more consistent with the other views. Move implicit queries from template to view.
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b9fabc69b505 b9fabc69b505 b9fabc69b505 b9fabc69b505 b9fabc69b505 b9fabc69b505 b9fabc69b505 b9fabc69b505 b9fabc69b505 b9fabc69b505 | # Standard library imports.
from StringIO import StringIO
from zipfile import ZipFile, ZIP_DEFLATED
# Django imports.
from django.contrib.auth.decorators import permission_required
from django.contrib import messages
from django.core.urlresolvers import reverse, reverse_lazy
from django.http import HttpResponse
from django.shortcuts import render_to_response, get_object_or_404
from django.views.generic import TemplateView, DetailView, CreateView, UpdateView, DeleteView
# Third-party application imports.
from braces.views import MultiplePermissionsRequiredMixin
# Application imports.
from .forms import EntityForm
from .models import Project, Entity, Location
from .utils import generate_entity_iptables
class IndexView(MultiplePermissionsRequiredMixin, TemplateView):
"""
Custom view used for rendering the index page.
"""
template_name = 'conntrackt/index.html'
# Required permissions.
permissions = {
"all": ("conntrackt.view",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
def get_context_data(self, **kwargs):
"""
Returns the context data that should be used for rendering of the
template.
Adds the 'projects' context object containing all of the projects
available sorted aplhabetically by name.
"""
# Set the context using the parent class.
context = super(IndexView, self).get_context_data(**kwargs)
# Store information about all projcts in context.
context['projects'] = Project.objects.all().order_by('name')
# Store information about all locations in context.
context['locations'] = Location.objects.all().order_by('name')
return context
class ProjectView(MultiplePermissionsRequiredMixin, DetailView):
"""
Custom view for presenting the project information.
"""
model = Project
permissions = {
"all": ("conntrackt.view",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
def get_context_data(self, **kwargs):
"""
Returns the context data that should be used for rendering of the
template.
Adds the 'location_entities' context object that contains tuples of the
form '(location, entities)', where location is an instance of a
Location, and entities is a query set of entities that belong to that
particular location, and to related project.
"""
# Set the context using the parent class.
context = super(ProjectView, self).get_context_data(**kwargs)
# Set-up an array that will contaion (location, entities) tuples.
location_entities = []
# Add the (location, entities) tuple for each location that has entities
# belonging to the related project.
for location in Location.objects.filter(entity__project=self.object).distinct().order_by("name"):
entities = Entity.objects.filter(project=self.object, location=location)
location_entities.append((location, entities))
# Add the (location, entities) tuples to context.
context['location_entities'] = location_entities
# Finally return the context.
return context
class EntityView(MultiplePermissionsRequiredMixin, DetailView):
"""
Custom view for presenting entity information.
"""
# Optimise the query to fetch the related data from reverse relationships.
queryset = Entity.objects.all()
queryset = queryset.prefetch_related('interface_set__destination_set__source__entity')
queryset = queryset.prefetch_related('interface_set__destination_set__destination__entity')
queryset = queryset.prefetch_related('interface_set__source_set__source__entity')
queryset = queryset.prefetch_related('interface_set__source_set__destination__entity')
# Required permissions.
permissions = {
"all": ("conntrackt.view",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
def get_context_data(self, **kwargs):
"""
Returns the context data that should be used for rendering of the
template.
Adds the 'entity_iptables' context object that contains full iptables
rules generated for the entity.
"""
# Call the parent class method.
context = super(DetailView, self).get_context_data(**kwargs)
# Add the rendered iptables rules to the context.
context['entity_iptables'] = generate_entity_iptables(self.object)
# Add the incoming and outgoing commmunication to the context.
context["incoming_communications"] = self.object.incoming_communications()
context["outgoing_communications"] = self.object.outgoing_communications()
# Add the interfaces to the context.
context["interfaces"] = self.object.interface_set.all().order_by("name")
# Add project/location to the context.
context["project"] = self.object.project
context["location"] = self.object.location
return context
@permission_required("conntrackt.view", raise_exception=True)
def entity_iptables(request, pk):
"""
Custom view that returns response containing iptables rules generated for an
entity.
Makes sure to set the Content-Disposition of a response in order to
signal the browser it should start download of this view's response
immediately. Also sets the suggested filename for it.
Arguments:
pk - Primary key of the Entity object for which the rules should be
generated.
Returns:
Response object that contains the iptables rules for specified entity.
"""
# Fetch the entity, and construct the response with iptables rules as
# content.
entity = get_object_or_404(Entity, pk=pk)
content = generate_entity_iptables(entity)
response = HttpResponse(content, mimetype='text/plain')
# Add the Content-Disposition information for the browser, telling the
# browser to download the file with suggested filename.
response['Content-Disposition'] = "attachment; filename=%s-iptables.conf" % entity.name.lower().replace(" ", "_")
return response
@permission_required("conntrackt.view", raise_exception=True)
def project_iptables(request, project_id, location_id=None):
"""
Custom view for obtaining iptables for all entities of a project or project
location in a single ZIP file.
Arguments:
request - Request object.
project_id - Unique ID of the project for whose entities the iptables
rules should be generated.
location_id - Optional unique ID of the project location for whose
entities the iptables rules should be generated. Default is None, which
means generate rules for _all_ entities in a project.
Returns:
Response object that contains the ZIP file and Content-Disposition
information.
"""
# Fetch the project.
project = get_object_or_404(Project, pk=project_id)
# Set-up a string IO object to which we'll write the ZIP file (in-memory).
buff = StringIO()
# Create a new ZIP file in-memory.
zipped_iptables = ZipFile(buff, "w", ZIP_DEFLATED)
# Create the response object, setting the mime type so browser could offer
# to open the file with program as well.
response = HttpResponse(mimetype='application/zip')
# If specific location was specified, get the entities that are part of that
# project location only, otherwise fetch all of the project's entities. Also
# set-up the filename that will be suggested to the browser.
if location_id:
location = get_object_or_404(Location, pk=location_id)
entities = project.entity_set.filter(location=location)
filename = '%s-%s-iptables.zip' % (project.name.lower().replace(" ", "_"), location.name.lower().replace(" ", "_"))
else:
entities = project.entity_set.all()
filename = '%s-iptables.zip' % (project.name.lower().replace(" ", "_"))
# Render iptables rules for each entity, placing them in the ZIP archive.
for entity in entities:
entity_iptables = generate_entity_iptables(entity)
zipped_iptables.writestr("%s-iptables.conf" % entity.name.lower().replace(" ", "_"), entity_iptables)
# Close the archive, and flush the buffer.
zipped_iptables.close()
buff.flush()
# Write the contents of our buffer (ZIP archive) to response content, and
# close the IO string.
response.write(buff.getvalue())
buff.close()
# Set the Content-Disposition so the browser would know it should download
# the archive, and suggest the filename.
response['Content-Disposition'] = 'attachment; filename="%s"' % filename
# Finally return the response object.
return response
class ProjectCreateView(MultiplePermissionsRequiredMixin, CreateView):
"""
View for creating a new project.
"""
model = Project
template_name_suffix = "_create_form"
# Required permissions.
permissions = {
"all": ("conntrackt.add_project",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
def get_form(self, form_class):
"""
Implements an override for the default form constructed for the create
view that includes some better styling of input widgets.
"""
form = super(ProjectCreateView, self).get_form(form_class)
form.fields["name"].widget.attrs["class"] = "span6"
form.fields["name"].widget.attrs["placeholder"] = "New Project"
form.fields["description"].widget.attrs["class"] = "span6"
form.fields["description"].widget.attrs["placeholder"] = "Description for new project."
return form
class ProjectUpdateView(MultiplePermissionsRequiredMixin, UpdateView):
"""
View for modifying an existing project.
"""
model = Project
template_name_suffix = "_update_form"
# Required permissions.
permissions = {
"all": ("conntrackt.change_project",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
def get_form(self, form_class):
"""
Implements an override for the default form constructed for the create
view that includes some better styling of input widgets.
"""
form = super(ProjectUpdateView, self).get_form(form_class)
form.fields["name"].widget.attrs["class"] = "span6"
form.fields["name"].widget.attrs["placeholder"] = "Project name"
form.fields["description"].widget.attrs["class"] = "span6"
form.fields["description"].widget.attrs["placeholder"] = "Description for project."
return form
class ProjectDeleteView(MultiplePermissionsRequiredMixin, DeleteView):
"""
View for deleting a project.
"""
model = Project
# Required permissions.
permissions = {
"all": ("conntrackt.delete_project",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
success_url = reverse_lazy("index")
def post(self, *args, **kwargs):
"""
Add a success message that will be displayed to the user to confirm the
project deletion.
"""
messages.success(self.request, "Project %s has been removed." % self.get_object().name, extra_tags="alert alert-success")
return super(ProjectDeleteView, self).post(*args, **kwargs)
class LocationCreateView(MultiplePermissionsRequiredMixin, CreateView):
"""
View for creating a new location.
"""
model = Location
template_name_suffix = "_create_form"
# Required permissions.
permissions = {
"all": ("conntrackt.add_location",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
success_url = reverse_lazy("index")
def get_form(self, form_class):
"""
Implements an override for the default form constructed for the create
view that includes some better styling of input widgets.
"""
form = super(LocationCreateView, self).get_form(form_class)
form.fields["name"].widget.attrs["class"] = "span6"
form.fields["name"].widget.attrs["placeholder"] = "New Location"
form.fields["description"].widget.attrs["class"] = "span6"
form.fields["description"].widget.attrs["placeholder"] = "Description for new location."
return form
class LocationUpdateView(MultiplePermissionsRequiredMixin, UpdateView):
"""
View for modifying an existing location.
"""
model = Location
template_name_suffix = "_update_form"
# Required permissions.
permissions = {
"all": ("conntrackt.change_location",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
success_url = reverse_lazy("index")
def get_form(self, form_class):
"""
Implements an override for the default form constructed for the create
view that includes some better styling of input widgets.
"""
form = super(LocationUpdateView, self).get_form(form_class)
form.fields["name"].widget.attrs["class"] = "span6"
form.fields["name"].widget.attrs["placeholder"] = "Location name"
form.fields["description"].widget.attrs["class"] = "span6"
form.fields["description"].widget.attrs["placeholder"] = "Description for location."
return form
class LocationDeleteView(MultiplePermissionsRequiredMixin, DeleteView):
"""
View for deleting a location.
"""
model = Location
# Required permissions.
permissions = {
"all": ("conntrackt.delete_location",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
success_url = reverse_lazy("index")
def post(self, *args, **kwargs):
"""
Add a success message that will be displayed to the user to confirm the
location deletion.
"""
messages.success(self.request, "Location %s has been removed." % self.get_object().name, extra_tags="alert alert-success")
return super(LocationDeleteView, self).post(*args, **kwargs)
class EntityCreateView(MultiplePermissionsRequiredMixin, CreateView):
"""
View for creating a new entity.
"""
model = Entity
form_class = EntityForm
template_name_suffix = "_create_form"
# Required permissions.
permissions = {
"all": ("conntrackt.add_entity",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
def get_form(self, form_class):
"""
Returns an instance of form that can be used by the view.
The method will limit the project or location select inputs if request
contained this information.
"""
form = super(EntityCreateView, self).get_form(form_class)
# Limit the project selection if required.
project_id = self.request.GET.get("project", None)
if project_id:
form.fields["project"].queryset = Project.objects.filter(pk=project_id)
form.fields["project"].widget.attrs["readonly"] = True
# Limit the location selection if required.
location_id = self.request.GET.get("location", None)
if location_id:
form.fields["location"].queryset = Location.objects.filter(pk=location_id)
form.fields["location"].widget.attrs["readonly"] = True
return form
def get_initial(self):
"""
Returns initial values that should be pre-selected (if they were
specified through a GET parameter).
"""
initial = super(EntityCreateView, self).get_initial()
initial["project"] = self.request.GET.get("project", None)
initial["location"] = self.request.GET.get("location", None)
return initial
class EntityUpdateView(MultiplePermissionsRequiredMixin, UpdateView):
"""
View for updating an existing entity.
"""
model = Entity
form_class = EntityForm
template_name_suffix = "_update_form"
# Required permissions.
permissions = {
"all": ("conntrackt.change_entity",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
class EntityDeleteView(MultiplePermissionsRequiredMixin, DeleteView):
"""
View for deleting an entity.
"""
model = Entity
# Required permissions.
permissions = {
"all": ("conntrackt.delete_entity",),
}
# Raise authorisation denied exception for unmet permissions.
raise_exception = True
def post(self, *args, **kwargs):
"""
Add a success message that will be displayed to the user to confirm the
entity deletion.
"""
messages.success(self.request, "Entity %s has been removed." % self.get_object().name, extra_tags="alert alert-success")
return super(EntityDeleteView, self).post(*args, **kwargs)
def delete(self, *args, **kwargs):
"""
Deletes the object. This method is overridden in order to obtain the
project ID for success URL.
@TODO: Fix this once Django 1.6 comes out with fix from ticket 19044.
"""
self.success_url = reverse("project", args=(self.get_object().project.id,))
return super(EntityDeleteView, self).delete(*args, **kwargs)
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