Make available tinyfied urls - #93

git-svn-id: http://www.peacefrogs.net/svn/chimere/trunk@77 9215b0d5-fb2c-4bbd-8d3e-bd2e9090e864

2 files changed, 63 insertions, 2 deletions

diff --git a/chimere/main/models.py b/chimere/main/models.py
index 4197a23..5c4151c 100644
--- a/chimere/main/models.py
+++ b/chimere/main/models.py
@@ -43,6 +43,45 @@ class News(models.Model):
     class Meta:
         verbose_name = _("News")
 
+class TinyUrl(models.Model):
+    """Tinyfied version of permalink parameters
+    """
+    parameters = models.CharField(_("Parameters"), max_length=500)
+    def __unicode__(self):
+        return self.parameters
+    class Meta:
+        verbose_name = _("TinyUrl")
+    digits = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    base = len(digits)
+
+    @classmethod
+    def getParametersByUrn(cls, urn):
+        c_id = 0
+        for idx, char in enumerate(urn):
+            c_id += cls.digits.index(char)*pow(cls.base, idx)
+        try:
+            params = cls.objects.get(id=c_id).parameters
+        except cls.DoesNotExist:
+            return ''
+        return params
+
+    @classmethod
+    def getUrnByParameters(cls, parameters):
+        try:
+            object = cls.objects.get(parameters=parameters)
+        except cls.DoesNotExist:
+            object = cls(parameters=parameters)
+            object.save()
+        n = object.id
+        urn = ''
+        while 1:
+            idx = n % cls.base
+            urn = cls.digits[idx] + urn
+            n = n / cls.base
+            if n == 0:
+                break
+        return urn
+
 class ColorTheme(models.Model):
     """Color theme
     """
diff --git a/chimere/main/views.py b/chimere/main/views.py
index 52c0627..f065f2c 100644
--- a/chimere/main/views.py
+++ b/chimere/main/views.py
@@ -33,7 +33,7 @@ from django.core import serializers
 from chimere import settings
 from chimere.main.actions import actions
 from chimere.main.models import Category, SubCategory, PropertyModel, Marker, \
-                                Route, News, SimpleArea, Area, Color
+                                Route, News, SimpleArea, Area, Color, TinyUrl
 
 from chimere.main.widgets import getMapJS, PointChooserWidget, \
                            RouteChooserWidget, URL_OSM_JS, URL_OSM_CSS
@@ -53,7 +53,6 @@ def get_base_response(area_name=""):
             base_url += '/'
         base_url += area_name + '/'
     base_response_dct['extra_url'] = base_url
-    base_response_dct['area_name'] = area_name
     if settings.CSS_AREAS and area_name:
         base_response_dct['css_area'] = area_name + ".css"
     base_response_dct['area_name'] = area_name
@@ -324,3 +323,26 @@ def getAvailableCategories(request, area=None, status='A', force=None):
     response_dct['sub_categories'] = subcategories
     return render_to_response('categories.html', response_dct)
 
+def getTinyfiedUrl(request, area_name='', parameters=''):
+    '''
+    Get the tinyfied version of parameters
+    '''
+    try:
+        urn = TinyUrl.getUrnByParameters(parameters)
+    except:
+        return HttpResponse('no results')
+    response_dct = get_base_response(area_name)
+    url = settings.SERVER_URL
+    if url[-1] == '/':
+        url = url[:-1]
+    url += response_dct['extra_url'] + 'ty/' + urn
+    data = '{"urn": "%s", "url":"%s"}' % (urn, url)
+    return HttpResponse(data)
+
+def redirectFromTinyURN(request, area_name='', tiny_urn=''):
+    """
+    Redirect from a tiny Urn
+    """
+    parameters = '?' + TinyUrl.getParametersByUrn(tiny_urn)
+    response_dct = get_base_response(area_name)
+    return HttpResponseRedirect(response_dct['extra_url'] + parameters)