Make the API a little more usable with client-side validation of Cons…

…entToTrack.

lib/createsend/subscriber.py

@@ -3,7 +3,7 @@
 import json
 
 from createsend.createsend import CreateSendBase, BadRequest
-from createsend.utils import json_to_py
+from createsend.utils import json_to_py, validate_consent_to_track
 
 
 class Subscriber(CreateSendBase):
@@ -26,6 +26,7 @@ def get(self, list_id=None, email_address=None, include_tracking_preference=Fals
 
     def add(self, list_id, email_address, name, custom_fields, resubscribe, consent_to_track, restart_subscription_based_autoresponders=False):
         """Adds a subscriber to a subscriber list."""
+        validate_consent_to_track(consent_to_track)
         body = {
             "EmailAddress": email_address,
             "Name": name,
@@ -40,6 +41,7 @@ def add(self, list_id, email_address, name, custom_fields, resubscribe, consent_
     def update(self, new_email_address, name, custom_fields, resubscribe, consent_to_track, restart_subscription_based_autoresponders=False):
         """Updates any aspect of a subscriber, including email address, name, and
         custom field data if supplied."""
+        validate_consent_to_track(consent_to_track)
         params = {"email": self.email_address}
         body = {
             "EmailAddress": new_email_address,

lib/createsend/transactional.py

@@ -3,7 +3,7 @@
 import json
 
 from createsend.createsend import CreateSendBase
-from createsend.utils import json_to_py
+from createsend.utils import json_to_py, validate_consent_to_track
 
 
 class Transactional(CreateSendBase):
@@ -30,6 +30,7 @@ def smart_email_details(self, smart_email_id):
 
     def smart_email_send(self, smart_email_id, to, consent_to_track, cc=None, bcc=None, attachments=None, data=None, add_recipients_to_list=None):
         """Sends the smart email."""
+        validate_consent_to_track(consent_to_track)
         body = {
             "To": to,
             "CC": cc,
@@ -45,6 +46,7 @@ def smart_email_send(self, smart_email_id, to, consent_to_track, cc=None, bcc=No
 
     def classic_email_send(self, subject, from_address, to, consent_to_track, client_id=None, cc=None, bcc=None, html=None, text=None, attachments=None, track_opens=True, track_clicks=True, inline_css=True, group=None, add_recipients_to_list=None):
         """Sends a classic email."""
+        validate_consent_to_track(consent_to_track)
         body = {
             "Subject": subject,
             "From": from_address,

lib/createsend/utils.py

@@ -8,6 +8,10 @@
 import json
 
 
+
+VALID_CONSENT_TO_TRACK_VALUES = ("yes", "no", "unchanged")
+
+
 class CertificateError(ValueError):
     """
     Raised when an error occurs when attempting to verify an SSL certificate.
@@ -135,6 +139,15 @@ def dict_to_object(d):
     return top
 
 
+def validate_consent_to_track(user_input):
+    from createsend import ClientError
+    if hasattr(user_input, 'lower'):
+        user_input = user_input.lower()
+    if user_input in VALID_CONSENT_TO_TRACK_VALUES:
+        return
+    raise ClientError("Consent to track value must be one of %s" % (VALID_CONSENT_TO_TRACK_VALUES,))
+
+
 def get_faker(expected_url, filename, status=None, body=None):
 
     class Faker(object):

test/test_subscriber.py

@@ -57,7 +57,7 @@ def test_add_without_custom_fields(self):
         self.subscriber.stub_request(
             "subscribers/%s.json" % self.list_id, "add_subscriber.json")
         email_address = self.subscriber.add(
-            self.list_id, "subscriber@example.com", "Subscriber", [], True, "Yes")
+            self.list_id, "subscriber@example.com", "Subscriber", [], True, "Unchanged")
         self.assertEquals(email_address, "subscriber@example.com")
 
     def test_add_with_custom_fields(self):