Implement basic api export of all active hosts

Done by zzz request. Export all seen hosts in json format { b32: last_seen }.

pyi2phosts/api/urls.py

@@ -0,0 +1,5 @@
+from django.conf.urls import *
+
+urlpatterns = patterns('pyi2phosts.api.views',
+		url(r'^all/$', 'all'),
+)

pyi2phosts/api/views.py

@@ -0,0 +1,16 @@
+import simplejson as json
+
+from django.http import HttpResponse
+
+from pyi2phosts.postkey.models import i2phost
+from pyi2phosts.lib.utils import get_b32
+
+def all(request):
+	"""Return all hosts in { "b32": "last seen timestamp" } form. Implemented by zzz request. """
+	# all hosts seen at least once
+	queryset = i2phost.objects.exclude(last_seen=None)
+	json_dict = {}
+	for host in queryset:
+		# pass last_seen to json in unixtime
+		json_dict[get_b32(host.b64hash)] = host.last_seen.strftime("%s")
+	return HttpResponse(json.dumps(json_dict), mimetype="application/json")

pyi2phosts/urls.py

@@ -23,6 +23,7 @@ urlpatterns = patterns('',
 		(r'^search/$', include('pyi2phosts.search.urls')),
 		(r'^postkey/', include('pyi2phosts.postkey.urls')),
 		(r'^jump/', include('pyi2phosts.jump.urls')),
+		(r'^api/', include('pyi2phosts.api.urls')),
 		(r'^i18n/', include('django.conf.urls.i18n')),
     # Example:
     # (r'^pyi2phosts.', include('pyi2phosts.foo.urls')),