Update PDF templates and enable sending of PDF via email.

PDFs now state QUOTE, INVOICE or RECEIPT.
Single copy and all but INVOICE includes terms of hire.

RIGS/signals.py

@@ -1,33 +1,79 @@
-import reversion
-from django.conf import settings
+import cStringIO as StringIO
+import re
+import urllib2
+from io import BytesIO
 
+import reversion
+from PyPDF2 import PdfFileReader, PdfFileMerger
+from django.conf import settings
 from django.core.mail import EmailMessage
 from django.template.loader import get_template
+from z3c.rml import rml2pdf
 
 from RIGS import models
 
 
 def send_eventauthorisation_success_email(instance):
+    # Generate PDF first to prevent context conflicts
+    context = {
+        'object': instance.event,
+        'fonts': {
+            'opensans': {
+                'regular': 'RIGS/static/fonts/OPENSANS-REGULAR.TTF',
+                'bold': 'RIGS/static/fonts/OPENSANS-BOLD.TTF',
+            }
+        },
+        'receipt': True,
+        'current_user': False,
+    }
+
+    template = get_template('RIGS/event_print.xml')
+    merger = PdfFileMerger()
+
+    rml = template.render(context)
+
+    buffer = rml2pdf.parseString(rml)
+    merger.append(PdfFileReader(buffer))
+    buffer.close()
+
+    terms = urllib2.urlopen(settings.TERMS_OF_HIRE_URL)
+    merger.append(StringIO.StringIO(terms.read()))
+
+    merged = BytesIO()
+    merger.write(merged)
+
+    # Produce email content
     context = {
         'object': instance,
     }
+
+    subject = "N%05d | %s - Event Authorised" % (instance.event.pk, instance.event.name)
+
     client_email = EmailMessage(
-        "N%05d | %s - Event Authorised".format(instance.event.pk, instance.event.name),
+        subject,
         get_template("RIGS/eventauthorisation_client_success.txt").render(context),
         to=[instance.email]
     )
 
+    escapedEventName = re.sub('[^a-zA-Z0-9 \n\.]', '', instance.event.name)
+
+    client_email.attach('N%05d - %s - RECEIPT.pdf' % (instance.event.pk, escapedEventName),
+                        merged.getvalue(),
+                        'application/pdf'
+                        )
+
     if instance.event.mic:
         mic_email_address = instance.event.mic.email
     else:
         mic_email_address = settings.AUTHORISATION_NOTIFICATION_ADDRESS
 
     mic_email = EmailMessage(
-        "N%05d | %s - Event Authorised".format(instance.event.pk, instance.event.name),
+        subject,
         get_template("RIGS/eventauthorisation_mic_success.txt").render(context),
         to=[mic_email_address]
     )
 
+    # Now we have both emails successfully generated, send them out
     client_email.send()
     mic_email.send()