Add DecrementIntValueToKey (#56)

* Update methods.py

* Update setup.py

licensing/methods.py

@@ -698,7 +698,47 @@ def increment_int_value_to_key(token, product_id, key, object_id,\
                return (None, "Could not contact the server.")
 
         return (jobj, "")
-
+
+    @staticmethod
+    def decrement_int_value_to_key(token, product_id, key, object_id,\
+                                   int_value=0, enable_bound=False, bound=0):
+
+        """
+        This method will decrement the int value of a data object associated with a license key.
+        
+        When creating an access token to this method, remember to include "DecrementIntValue" permission and 
+        set the "Lock to key" value to -1.
+        
+        More docs: https://app.cryptolens.io/docs/api/v3/DecrementIntValue (see parameters under Method 2)
+        """
+
+        try:
+            response = HelperMethods.send_request("/data/DecrementIntValueToKey/",\
+                                                  {"token":token,\
+                                                   "ProductId" : product_id,\
+                                                   "Key" : key,\
+                                                   "Id" : object_id,\
+                                                   "IntValue": int_value ,\
+                                                   "EnableBound": str(enable_bound),\
+                                                   "Bound" : bound
+                                                   })
+        except HTTPError as e:
+            response = e.read()
+        except URLError as e:
+            return (None, "Could not contact the server. Error message: " + str(e))
+        except Exception:
+            return (None, "Could not contact the server.")
+
+        jobj = json.loads(response)
+
+        if jobj == None or not("result" in jobj) or jobj["result"] == 1:
+            if jobj != None:
+                return (None, jobj["message"])
+            else:
+               return (None, "Could not contact the server.")
+
+        return (jobj, "")
+
     @staticmethod
     def add_data_object_to_key(token, product_id, key, name = "", string_value="",\
                                    int_value=0, check_for_duplicates=False):

setup.py

@@ -2,13 +2,13 @@
 setup(
   name = 'licensing',         # How you named your package folder (MyLib)
   packages = ['licensing'],   # Chose the same as "name"
-  version = '0.37',      # Start with a small number and increase it with every change you make
+  version = '0.38',      # Start with a small number and increase it with every change you make
   license='MIT',        # Chose a license from here: https://help.github.com/articles/licensing-a-repository
   description = 'Client library for Cryptolens licensing Web API.',   # Give a short description about your library
   author = 'Cryptolens AB',                   # Type in your name
   author_email = '[email protected]',      # Type in your E-Mail
   url = 'https://cryptolens.io',   # Provide either the link to your github or to your website
-  download_url = 'https://github.com/Cryptolens/cryptolens-python/archive/v_37.tar.gz',    # I explain this later on
+  download_url = 'https://github.com/Cryptolens/cryptolens-python/archive/v_38.tar.gz',    # I explain this later on
   keywords = ['software licensing', 'licensing library', 'cryptolens'],   # Keywords that define your package best
   classifiers=[
     #'Development Status :: 5 - Stable',      # Chose either "3 - Alpha", "4 - Beta" or "5 - Production/Stable" as the current state of your package