[8.0][#57] Make MTD authorisation tolerant of trailing / on redirec…

…t URL configured by user

Merge pull request #59 from OpusVL/mtd-vat-8.0-57-tolerate-trailing-slash-on-redirect-url

account_mtd/models/mtd_user_authorisation.py

@@ -18,7 +18,9 @@ class MtdUserAuthorisation(models.Model):
     @api.multi
     def get_user_authorisation(self, module_name=None, record=None):
         tracker_api = self.create_tracker_record(module_name, record)
-        redirect_uri = "{}/auth-redirect".format(record.hmrc_configuration.redirect_url)
+        normalised_redirect_url = \
+            record.hmrc_configuration.redirect_url.rstrip('/')
+        redirect_uri = "{}/auth-redirect".format(normalised_redirect_url)
         state = ""
         # State is optional
         if record.hmrc_configuration.state:
@@ -94,4 +96,4 @@ def create_tracker_record(self, module_name=None, record=None):
             'module_name': module_name,
             'company_id': record.company_id.id
         })
-        return tracker_api
+        return tracker_api