1 files changed, 39 insertions, 0 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
     """