xos/vpn/admin.py

from core.admin import ReadOnlyAwareAdmin, SliceInline
from core.middleware import get_request
from core.models import User
from django import forms
from django.contrib import admin
from subprocess import Popen, PIPE
from vpn.models import VPNService, VPNTenant, VPN_KIND

class VPNServiceAdmin(ReadOnlyAwareAdmin):
    model = VPNService
    verbose_name = "VPN Service"

    list_display = ("backend_status_icon", "name", "enabled")

    list_display_links = ('backend_status_icon', 'name', )

    fieldsets = [(None, {'fields': ['backend_status_text', 'name', 'enabled',
                                    'versionNumber', 'description', "view_url"],
                         'classes':['suit-tab suit-tab-general']})]

    readonly_fields = ('backend_status_text', )

    inlines = [SliceInline]

    extracontext_registered_admins = True

    user_readonly_fields = ["name", "enabled", "versionNumber", "description"]

    suit_form_tabs = (('general', 'VPN Service Details'),
                      ('administration', 'Tenants'),
                      ('slices', 'Slices'),)

    suit_form_includes = (('vpnserviceadmin.html',
                           'top',
                           'administration'),)

    def queryset(self, request):
        return VPNService.get_service_objects_by_user(request.user)

class VPNTenantForm(forms.ModelForm):
    creator = forms.ModelChoiceField(queryset=User.objects.all())
    # They key used to connect to this server
    server_key = forms.CharField(required=False)

    def __init__(self, *args, **kwargs):
        super(VPNTenantForm, self).__init__(*args, **kwargs)
        self.fields['kind'].widget.attrs['readonly'] = True
        # Make the server_key disabled
        self.fields['server_key'].widget.attrs['disabled'] = True

        self.fields[
            'provider_service'].queryset = VPNService.get_service_objects().all()

        self.fields['kind'].initial = VPN_KIND

        if self.instance:
            self.fields['creator'].initial = self.instance.creator
            self.fields['server_key'].initial = self.instance.server_key

        # If there is not an instance then we need to set initial values.
        if (not self.instance) or (not self.instance.pk):
            self.fields['creator'].initial = get_request().user
            self.fields['server_key'].initial = generate_VPN_Key()
            if VPNService.get_service_objects().exists():
                self.fields["provider_service"].initial = VPNService.get_service_objects().all()[0]

    def save(self, commit=True):
        self.instance.creator = self.cleaned_data.get("creator")
        self.instance.server_key = self.cleaned_data.get("sever_key")
        return super(VPNTenantForm, self).save(commit=commit)

    def generate_VPN_Key():
        proc = Popen("openvpn --genkey --secret /dev/stdout", shell=True, stdout=PIPE)
        (stdout, stderr) = proc.communicate()
        return stdout

    class Meta:
        model = VPNTenant

class VPNTenantAdmin(ReadOnlyAwareAdmin):
    verbose_name = "VPN Tenant Admin"
    list_display = ('id', 'backend_status_icon', 'instance')
    list_display_links = ('id', 'backend_status_icon', 'instance')
    fieldsets = [(None, {'fields': ['backend_status_text', 'kind',
                                    'provider_service', 'instance', 'creator',
                                    'server_key'],
                         'classes': ['suit-tab suit-tab-general']})]
    readonly_fields = ('backend_status_text', 'instance',)
    form = VPNTenantForm

    suit_form_tabs = (('general', 'Details'),)

    def queryset(self, request):
        return VPNTenant.get_tenant_objects_by_user(request.user)

# Associate the admin forms with the models.
admin.site.register(VPNService, VPNServiceAdmin)
admin.site.register(VPNTenant, VPNTenantAdmin)