initial working version

layar/models.py

@@ -0,0 +1,3 @@
+from django.db import models
+
+# Create your models here.

layar/views.py

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+from hashlib import sha1
+from django.conf import settings
+from django.http import HttpResponse
+from django.utils import simplejson as json
+
+class LayarException(Exception):
+    def __init__(self, code, message):
+        self.code = code
+        self.message = message
+
+class POI(object):
+
+    def __init__(self, id, lat, lon, title, actions=None, image_url=None,
+                 line2=None, line3=None, line4=None, type=0, attribution=None):
+        self.id = str(id)
+        self.lat = lat
+        self.lon = lon
+        self.title = title          # recommended max len 60
+        self.imageURL = image_url
+        self.line2 = line2          # recommended max len 35
+        self.line3 = line3
+        self.line4 = line4
+        self.type = type
+        self.attribution = attribution  # recommended max len 45
+        self.actions = actions
+
+    def to_dict(self):
+        d = dict(self.__dict__)
+
+        # do lat/long conversion
+        if isinstance(self.lat, float):
+            d['lat'] = int(self.lat*1000000)
+        if isinstance(self.lon, float):
+            d['lon'] = int(self.lon*1000000)
+
+        # convert actions dictionary into expected format
+        if self.actions:
+            d['actions'] = [{'label':k, 'uri':v} for k,v in self.actions.iteritems()]
+        else:
+            d['actions'] = []
+
+        return d
+
+class LayarView(object):
+
+    results_per_page = 15
+    max_results = 50
+
+    def __init__(self):
+        self.developer_key = settings.LAYAR_DEVELOPER_KEY
+
+    def __call__(self, request):
+        user_id = request.GET['userId']
+        developer_id = request.GET['developerId']
+        developer_hash = request.GET['developerHash']
+        timestamp = request.GET['timestamp']
+        layer_name = request.GET['layerName']
+        latitude = request.GET['lat']
+        longitude = request.GET['lon']
+        accuracy = request.GET['accuracy']
+        radius = request.GET['radius']
+        radio_option = request.GET.get('RADIOLIST')
+        search_query = request.GET.get('SEARCHBOX')
+        custom_slider = request.GET.get('CUSTOM_SLIDER')
+        page_key = request.GET.get('pageKey')
+
+        # oauth: oauth_consumer_key, oauth_signature_method, oauth_timestamp,
+        #   oauth_nonce, oauth_version, oauth_signature
+
+        layar_response = dict(hotspots=[], layer=layer_name, errorCode=0,
+                              errorString='ok', nextPageKey=None, morePages=False)
+
+        try:
+
+            # verify hash
+            key = self.developer_key + timestamp
+            if sha1(key).hexdigest() != developer_hash:
+                raise LayarException(20, 'Bad developerHash')
+
+            try:
+                poi_func = getattr(self, 'get_%s_pois' % layer_name)
+            except AttributeError:
+                raise LayarException(21, 'no such layer: %s' % layer_name)
+
+            pois = poi_func(latitude=latitude, longitude=longitude, radius=radius,
+                            start_index=0,
+                            radio_option=radio_option, search_query=search_query,
+                            custom_slider=custom_slider)
+
+            # pagination logic
+            if len(pois) > self.max_results:
+                pois = pois[:self.max_results]
+
+            layar_response['hotspots'] = [poi.to_dict() for poi in pois]
+
+        except LayarException, e:
+            layar_response['errorCode'] = e.code
+            layar_response['errorString'] = e.message
+
+        content = json.dumps(layar_response)
+        return HttpResponse(content, content_type='application/javascript; charset=utf-8')