Add trial_callback to the example, and the callback parameter to the ta.use_trial() function.

Code improvements. Remove some dead code.

Author: wyattoday

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to this project are documented in this file.
 
+## 4.4.4.1 - 2021-05-27
+
+* Add `trial_callback` to the example, and the callback parameter to the ta.use_trial() function.
+* Code improvements. Remove some dead code.
+
 ## 4.4.4 - 2021-05-06
 
 * Remove unused "sandbox" flag and error code. Sandboxes are VMs.

example.py

@@ -8,7 +8,9 @@
     TurboActivateError,
     TurboActivateTrialExpiredError,
     TA_USER,
-    TA_SYSTEM
+    TA_SYSTEM,
+    TA_CB_EXPIRED,
+    TA_CB_EXPIRED_FRAUD
 )
 
 import sys
@@ -20,6 +22,29 @@
 DAYS_BETWEEN_CHECKS = 90
 GRACE_PERIOD_LENGTH = 14
 
+'''
+This function will be called by a separate background thread to notify
+your app of trial expiration (either naturally, or because of customer fraud).
+
+That means if you're displaying UI to your users you must ensure
+that any windows (or any resource sharing for that matter) are
+created in the right thread context or bad things might happen.
+Test this behavior well before releasing to your end-users.
+'''
+def trial_callback(status, unused):
+
+    if status == TA_CB_EXPIRED:
+        # TODO: disallow any features in your app.
+        print("The app trial period has expired")
+
+    elif status == TA_CB_EXPIRED_FRAUD:
+        # TODO: disallow any features in your app.
+        print("The lease has been dropped due to computer sleeping.")
+
+    else:
+        print("The app trial callback returned an unexpected status: ", status)
+
+
 if __name__ == "__main__":
 
     # support both Python 2 and 3
@@ -105,7 +130,7 @@
             # Start or re-validate the trial if it has already started.
             # This need to be called at least once before you can use
             # any other trial functions.
-            ta.use_trial(verified_trial)
+            ta.use_trial(verified_trial, "", trial_callback)
 
             # Get the number of trial days remaining.
             trial_days = ta.trial_days_remaining(verified_trial)

setup.py

@@ -4,7 +4,7 @@
 from distutils.core import setup
 
 setup(name="turboactivate",
-      version="4.4.4",
+      version="4.4.4.1",
       description="Python integration for the LimeLM TurboActivate library. This lets you add hardware-locked licensing (a.k.a. node-locked licensing) to your Python app.",
       url="https://wyday.com/limelm/help/using-turboactivate-with-python/",
       download_url="https://github.com/wyday/python-turboactivate",

turboactivate/__init__.py

@@ -31,7 +31,7 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 # IN THE SOFTWARE.
 
-from ctypes import pointer, sizeof, c_uint32
+from ctypes import pointer, sizeof, c_uint32, c_void_p
 
 from turboactivate.c_wrapper import *
 
@@ -133,17 +133,14 @@ def get_pkey(self):
 
     def deactivate(self, erase_p_key=False):
         """
-       Deactivates the product on this computer. Set erasePkey to 1 to erase the stored
-       product key, 0 to keep the product key around. If you're using deactivate to let
-       a user move between computers it's almost always best to *not* erase the product
-       key. This way you can just use TA_Activate() when the user wants to reactivate
-       instead of forcing the user to re-enter their product key over-and-over again.
+        Deactivates the product on this computer. Set erasePkey to 1 to erase the stored
+        product key, 0 to keep the product key around. If you're using deactivate to let
+        a user move between computers it's almost always best to *not* erase the product
+        key. This way you can just use TA_Activate() when the user wants to reactivate
+        instead of forcing the user to re-enter their product key over-and-over again.
         """
 
-        if erase_p_key is True:
-            args = 1
-        else:
-            args = 0
+        args = 1 if erase_p_key else 0
 
         self._lib.TA_Deactivate(self._handle, args)
 
@@ -304,7 +301,7 @@ def is_genuine_ex(self, days_between_checks, grace_days_on_inet_err, skip_offlin
 
     # Trial
 
-    def use_trial(self, verified=True, extra_data=""):
+    def use_trial(self, verified=True, extra_data="", callback = None):
         """
         Begins the trial the first time it's called. Calling it again will validate the trial
         data hasn't been tampered with.
@@ -318,6 +315,14 @@ def use_trial(self, verified=True, extra_data=""):
         else:
             args.append(None)
 
+        # Set the trial callback
+        if callback is not None:
+            # "cast" the native python function to TrialCallback type
+            # save it locally so that it acutally works when it's called
+            # back
+            self._callback = TrialCallback(callback)
+            self._lib.TA_SetTrialCallback(self._handle, self._callback, c_void_p(0))
+
         self._lib.TA_UseTrial(self._handle, *args)
 
     def trial_days_remaining(self, verified=True):
@@ -425,3 +430,4 @@ def _set_restype(self):
         self._lib.TA_IsDateValid.restype = validate_result
         self._lib.TA_SetCustomProxy.restype = validate_result
         self._lib.TA_SetCustomActDataPath.restype = validate_result
+        self._lib.TA_SetTrialCallback.restype = validate_result

turboactivate/c_wrapper.py

@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 #
 # Copyright 2013, 2014 Develer S.r.l. (https://www.develer.com/)
-# Copyright 2018 wyDay, LLC (https://wyday.com/)
+# Copyright 2021 wyDay, LLC (https://wyday.com/)
 #
 # Current Author / maintainer:
 #
@@ -36,11 +36,14 @@
 from ctypes import (
     cdll,
     c_uint,
+    c_uint32,
+    c_void_p,
     c_char_p,
     c_wchar_p,
     Structure,
     create_string_buffer,
-    create_unicode_buffer
+    create_unicode_buffer,
+    CFUNCTYPE
 )
 
 # Utilities
@@ -166,6 +169,19 @@ def __init__(self, string):
 TA_HAS_NOT_EXPIRED = 0x00000001
 
 
+# Possible callback statuses from the TrialCallbackType function:
+
+'''
+Callback-status value used when the trial has expired.
+'''
+TA_CB_EXPIRED = 0x00000000
+
+'''
+Callback-status value used when the trial has expired due to date/time fraud.
+'''
+TA_CB_EXPIRED_FRAUD = 0x00000001
+
+
 class GENUINE_OPTIONS(Structure):
     _fields_ = [
         ("nLength", c_uint),
@@ -182,6 +198,8 @@ class ACTIVATE_OPTIONS(Structure):
     ]
 
 
+TrialCallback = CFUNCTYPE(None, c_uint32, c_void_p)
+
 def load_library(path):
 
     if sys.platform == 'win32' or sys.platform == 'cygwin':