pdt functionality in a decorator

README.md

@@ -21,7 +21,7 @@ Using PayPal Payments Standard IPN:
 
 1. Download the code from GitHub:
 
-        git clone git://github.com/johnboxall/django-paypal.git paypal
+        git clone git://github.com/shezi/django-paypal.git paypal
 
 1. Edit `settings.py` and add  `paypal.standard.ipn` to your `INSTALLED_APPS` 
    and `PAYPAL_RECEIVER_EMAIL`:
@@ -142,6 +142,16 @@ Paypal Payment Data Transfer (PDT) allows you to display transaction details to
             (r'^paypal/pdt/', include('paypal.standard.pdt.urls')),
             ...
         )
+    Alternatively, you can use the pdt decorator to work with PDT information in one of your own views.
+    To do this, add the decorator to one of your views.
+        # views.py
+        from paypal.standard.pdt.decorators import pdt
+
+        @pdt
+        def view_func(request, *args, **kwargs):
+            ...
+    The decorator checks for any GET parameters corresponding to a PDT call and adds the keyword arguments `pdt_active`, `pdt_failed` and `pdt` to the view call.
+
 
 Using PayPal Payments Standard with Subscriptions:
 --------------------------------------------------

paypal/standard/pdt/decorators.py

@@ -0,0 +1,56 @@
+# -*- encoding: utf-8 -*-
+
+from paypal.standard.pdt.models import PayPalPDT
+from paypal.standard.pdt.forms import PayPalPDTForm
+
+
+def pdt(f):
+    """Parses out GET parameters corresponding to a paypal PDT request and adds `pdt_active`, `pdt_failed` and `pdt` to the call **kwargs.
+
+    Payment data transfer implementation: http://tinyurl.com/c9jjmw"""
+
+    def aux(request, *args, **kwargs):
+        if request.method == 'POST':
+            return f(request, *args, **kwargs) 
+
+        pdt_obj = None
+        pdt_active = False
+        txn_id = request.GET.get('tx')
+        failed = False
+        if txn_id is not None:
+            pdt_active = True
+            # If an existing transaction with the id tx exists: use it
+            try:
+                pdt_obj = PayPalPDT.objects.get(txn_id=txn_id)
+            except PayPalPDT.DoesNotExist:
+                # This is a new transaction so we continue processing PDT request
+                pass
+
+            if pdt_obj is None:
+                form = PayPalPDTForm(request.GET)
+                if form.is_valid():
+                    try:
+                        pdt_obj = form.save(commit=False)
+                    except Exception, e:
+                        error = repr(e)
+                        failed = True
+                else:
+                    error = form.errors
+                    failed = True
+
+                if failed:
+                    pdt_obj = PayPalPDT()
+                    pdt_obj.set_flag("Invalid form. %s" % error)
+
+                pdt_obj.initialize(request)
+
+                if not failed:
+                    # The PDT object gets saved during verify
+                    pdt_obj.verify(item_check_callable)
+        else:
+            pass # we ignore any PDT requests that don't have a transaction id
+
+        kwargs.update({'pdt_active': pdt_active, 'pdt_failed': failed, 'pdt_obj': pdt_obj})
+        return f(request, *args, **kwargs)
+
+    return aux

paypal/standard/pdt/views.py

@@ -3,48 +3,12 @@
 from django.template import RequestContext
 from django.shortcuts import render_to_response
 from django.views.decorators.http import require_GET
-from paypal.standard.pdt.models import PayPalPDT
-from paypal.standard.pdt.forms import PayPalPDTForm
-
+from paypal.standard.pdt.decorators import pdt 
 
 @require_GET
-def pdt(request, item_check_callable=None, template="pdt/pdt.html", context=None):
+@pdt
+def pdt(request, pdt_active=True, pdt_failed=False, pdt_obj=None, item_check_callable=None, template="pdt/pdt.html", context=None):
     """Payment data transfer implementation: http://tinyurl.com/c9jjmw"""
-    context = context or {}
-    pdt_obj = None
-    txn_id = request.GET.get('tx')
-    failed = False
-    if txn_id is not None:
-        # If an existing transaction with the id tx exists: use it
-        try:
-            pdt_obj = PayPalPDT.objects.get(txn_id=txn_id)
-        except PayPalPDT.DoesNotExist:
-            # This is a new transaction so we continue processing PDT request
-            pass
-
-        if pdt_obj is None:
-            form = PayPalPDTForm(request.GET)
-            if form.is_valid():
-                try:
-                    pdt_obj = form.save(commit=False)
-                except Exception, e:
-                    error = repr(e)
-                    failed = True
-            else:
-                error = form.errors
-                failed = True
-
-            if failed:
-                pdt_obj = PayPalPDT()
-                pdt_obj.set_flag("Invalid form. %s" % error)
-
-            pdt_obj.initialize(request)
-
-            if not failed:
-                # The PDT object gets saved during verify
-                pdt_obj.verify(item_check_callable)
-    else:
-        pass # we ignore any PDT requests that don't have a transaction id
-
-    context.update({"failed":failed, "pdt_obj":pdt_obj})
-    return render_to_response(template, context, RequestContext(request))
+    context = context or {} 
+    context.update({"failed":pdt_failed, "pdt_obj":pdt_obj})
+    return render_to_response(template, context, RequestContext(request))