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Location: conntrackt/conntrackt/views.py
90fac7c6abb9
6.6 KiB
text/x-python
Renamed the tags library. Removed the line stripper middleware, and replaced it with some custom code that will remove all blank lines. The iptables rule rendering has been rewritten to accomodate this change (a utility function has been added for generating them). Fixed some code styling.
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from StringIO import StringIO
from zipfile import ZipFile, ZIP_DEFLATED
# Django-specific imports.
from django.http import HttpResponse
from django.shortcuts import render_to_response, get_object_or_404
from django.views.generic import TemplateView, DetailView
# Application-specific imports.
from .models import Project, Entity, Location
from .stripper import StripperMiddleware
from .utils import generate_entity_iptables
class IndexView(TemplateView):
"""
Custom view used for rendering the index page.
"""
template_name = 'conntrackt/index.html'
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)
context['projects'] = Project.objects.all().order_by('name')
return context
class ProjectView(DetailView):
"""
Custom view for presenting the project information.
"""
model = Project
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():
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(DetailView):
"""
Custom view for presenting entity information.
"""
model = Entity
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)
return context
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
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, location.name)
else:
entities = project.entity_set.all()
filename = '%s-iptables.zip' % (project.name)
# Lower-case the filename, and replace spaces with underscores (_).
filename = filename.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
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