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annotate donations/views.py @ 617:95a80c1fe87b

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author Brian Neal <bgneal@gmail.com>
date Sat, 22 Sep 2012 11:10:31 -0500
parents ee87ea74d46b
children e1c03da72818
rev   line source
bgneal@35 1 """
bgneal@35 2 Views for the donations application.
bgneal@35 3 """
bgneal@36 4 import urllib2
bgneal@36 5 import decimal
bgneal@36 6 import datetime
bgneal@316 7 import logging
bgneal@36 8
bgneal@35 9 from django.shortcuts import render_to_response
bgneal@35 10 from django.template import RequestContext
bgneal@35 11 from django.conf import settings
bgneal@35 12 from django.contrib.sites.models import Site
bgneal@36 13 from django.http import HttpResponse
bgneal@36 14 from django.http import HttpResponseServerError
bgneal@36 15 from django.contrib.auth.models import User
bgneal@238 16 from django.views.decorators.csrf import csrf_exempt
bgneal@238 17
bgneal@35 18
bgneal@35 19 from donations.models import Donation
bgneal@35 20
bgneal@63 21 PP_DATE_FMT = '%H:%M:%S %b %d, %Y'
bgneal@35 22
bgneal@36 23 def paypal_params():
bgneal@36 24 """
bgneal@36 25 This function returns a tuple where the 1st element is the Paypal
bgneal@36 26 URL and the 2nd element is the Paypal business email. This information
bgneal@36 27 depends on the setting DONATIONS_DEBUG.
bgneal@36 28 """
bgneal@36 29 if settings.DONATIONS_DEBUG:
bgneal@35 30 form_action = 'https://www.sandbox.paypal.com/cgi-bin/webscr'
bgneal@35 31 business = settings.DONATIONS_BUSINESS_DEBUG
bgneal@35 32 else:
bgneal@35 33 form_action = 'https://www.paypal.com/cgi-bin/webscr'
bgneal@35 34 business = settings.DONATIONS_BUSINESS
bgneal@35 35
bgneal@36 36 return form_action, business
bgneal@36 37
bgneal@36 38
bgneal@316 39 def verify_request(params):
bgneal@316 40 """
bgneal@316 41 Send the parameters back to Paypal and return the response string.
bgneal@316 42 """
bgneal@316 43 # If we are doing localhost-type unit tests, just return whatever
bgneal@316 44 # the test wants us to...
bgneal@316 45 if hasattr(settings, 'DONATIONS_DEBUG_VERIFY_RESPONSE'):
bgneal@316 46 return settings.DONATIONS_DEBUG_VERIFY_RESPONSE
bgneal@316 47
bgneal@316 48 req = urllib2.Request(paypal_params()[0], params)
bgneal@316 49 req.add_header("Content-type", "application/x-www-form-urlencoded")
bgneal@316 50 try:
bgneal@316 51 response = urllib2.urlopen(req)
bgneal@316 52 except URLError, e:
bgneal@316 53 logging.exception('IPN: exception verifying IPN: %s', e)
bgneal@316 54 return None
bgneal@316 55
bgneal@316 56 return response.read()
bgneal@316 57
bgneal@316 58
bgneal@36 59 def index(request):
bgneal@36 60 gross, net, donations = Donation.objects.monthly_stats()
bgneal@36 61 current_site = Site.objects.get_current()
bgneal@36 62 form_action, business = paypal_params()
bgneal@36 63
bgneal@35 64 return render_to_response('donations/index.html', {
bgneal@35 65 'goal': settings.DONATIONS_GOAL,
bgneal@35 66 'gross': gross,
bgneal@35 67 'net': net,
bgneal@35 68 'left': settings.DONATIONS_GOAL - net,
bgneal@35 69 'donations': donations,
bgneal@35 70 'form_action': form_action,
bgneal@35 71 'business': business,
bgneal@35 72 'anonymous': settings.DONATIONS_ANON_NAME,
bgneal@35 73 'item_name': settings.DONATIONS_ITEM_NAME,
bgneal@35 74 'item_number': settings.DONATIONS_ITEM_NUM,
bgneal@35 75 'item_anon_number': settings.DONATIONS_ITEM_ANON_NUM,
bgneal@35 76 'domain': current_site.domain,
bgneal@35 77 },
bgneal@35 78 context_instance = RequestContext(request))
bgneal@35 79
bgneal@35 80
bgneal@238 81 @csrf_exempt
bgneal@35 82 def ipn(request):
bgneal@36 83 """
bgneal@36 84 This function is the IPN listener and handles the IPN POST from Paypal.
bgneal@39 85 The algorithm here roughly follows the outline described in chapter 2
bgneal@39 86 of Paypal's IPNGuide.pdf "Implementing an IPN Listener".
bgneal@316 87
bgneal@39 88 """
bgneal@39 89 # Log some info about this IPN event
bgneal@39 90 ip = request.META.get('REMOTE_ADDR', '?')
bgneal@39 91 parameters = request.POST.copy()
bgneal@316 92 logging.info('IPN from %s; post data: %s', ip, parameters.urlencode())
bgneal@35 93
bgneal@39 94 # Now we follow the instructions in chapter 2 of the Paypal IPNGuide.pdf.
bgneal@39 95 # Create a request that contains exactly the same IPN variables and values in
bgneal@39 96 # the same order, preceded with cmd=_notify-validate
bgneal@39 97 parameters['cmd']='_notify-validate'
bgneal@36 98
bgneal@316 99 # Post the request back to Paypal (either to the sandbox or the real deal),
bgneal@316 100 # and read the response:
bgneal@316 101 status = verify_request(parameters.urlencode())
bgneal@39 102 if status != 'VERIFIED':
bgneal@316 103 logging.warning('IPN: Payapl did not verify; status was %s', status)
bgneal@39 104 return HttpResponse()
bgneal@36 105
bgneal@39 106 # Response was VERIFIED; act on this if it is a Completed donation,
bgneal@39 107 # otherwise don't handle it (we are just a donations application. Here
bgneal@39 108 # is where we could be expanded to be a more general payment processor).
bgneal@36 109
bgneal@39 110 payment_status = parameters.get('payment_status')
bgneal@39 111 if payment_status != 'Completed':
bgneal@316 112 logging.info('IPN: payment_status is %s; we are done.', payment_status)
bgneal@39 113 return HttpResponse()
bgneal@39 114
bgneal@39 115 # Is this a donation to the site?
bgneal@39 116 item_number = parameters.get('item_number')
bgneal@316 117 if (item_number == settings.DONATIONS_ITEM_NUM or
bgneal@316 118 item_number == settings.DONATIONS_ITEM_ANON_NUM):
bgneal@39 119 process_donation(item_number, parameters)
bgneal@39 120 else:
bgneal@39 121 logging.info('IPN: not a donation; done.')
bgneal@39 122
bgneal@39 123 return HttpResponse()
bgneal@36 124
bgneal@36 125
bgneal@36 126 def process_donation(item_number, params):
bgneal@36 127 """
bgneal@39 128 A few validity and duplicate checks are made on the donation params.
bgneal@316 129 If everything is ok, construct a donation object from the parameters and
bgneal@39 130 store it in the database.
bgneal@316 131
bgneal@36 132 """
bgneal@36 133 # Has this transaction been processed before?
bgneal@39 134 txn_id = params.get('txn_id')
bgneal@39 135 if txn_id is None:
bgneal@39 136 logging.error('IPN: missing txn_id')
bgneal@36 137 return
bgneal@39 138
bgneal@36 139 try:
bgneal@36 140 donation = Donation.objects.get(txn_id__exact=txn_id)
bgneal@36 141 except Donation.DoesNotExist:
bgneal@36 142 pass
bgneal@36 143 else:
bgneal@39 144 logging.warning('IPN: duplicate txn_id')
bgneal@36 145 return # no exception, this is a duplicate
bgneal@36 146
bgneal@36 147 # Is the email address ours?
bgneal@36 148 business = params.get('business')
bgneal@36 149 if business != paypal_params()[1]:
bgneal@316 150 logging.warning('IPN: invalid business: %s', business)
bgneal@36 151 return
bgneal@36 152
bgneal@36 153 # is this a payment received?
bgneal@36 154 txn_type = params.get('txn_type')
bgneal@36 155 if txn_type != 'web_accept':
bgneal@316 156 logging.warning('IPN: invalid txn_type: %s', txn_type)
bgneal@36 157 return
bgneal@316 158
bgneal@36 159 # Looks like a donation, save it to the database.
bgneal@36 160 # Determine which user this came from, if any.
bgneal@36 161 # The username is stored in the custom field if the user was logged in when
bgneal@36 162 # the donation was made.
bgneal@36 163 user = None
bgneal@65 164 if 'custom' in params and params['custom']:
bgneal@36 165 try:
bgneal@36 166 user = User.objects.get(username__exact=params['custom'])
bgneal@36 167 except User.DoesNotExist:
bgneal@36 168 pass
bgneal@36 169
bgneal@36 170 is_anonymous = item_number == settings.DONATIONS_ITEM_ANON_NUM
bgneal@36 171 test_ipn = params.get('test_ipn') == '1'
bgneal@36 172
bgneal@36 173 first_name = params.get('first_name', '')
bgneal@36 174 last_name = params.get('last_name', '')
bgneal@36 175 payer_email = params.get('payer_email', '')
bgneal@36 176 payer_id = params.get('payer_id', '')
bgneal@36 177 memo = params.get('memo', '')
bgneal@36 178 payer_status = params.get('payer_status', '')
bgneal@36 179
bgneal@36 180 try:
bgneal@36 181 mc_gross = decimal.Decimal(params['mc_gross'])
bgneal@36 182 mc_fee = decimal.Decimal(params['mc_fee'])
bgneal@36 183 except KeyError, decimal.InvalidOperation:
bgneal@39 184 logging.error('IPN: invalid/missing mc_gross or mc_fee')
bgneal@36 185 return
bgneal@36 186
bgneal@61 187 payment_date = params.get('payment_date')
bgneal@61 188 if payment_date is None:
bgneal@61 189 logging.error('IPN: missing payment_date')
bgneal@36 190 return
bgneal@36 191
bgneal@61 192 # strip off the timezone
bgneal@61 193 payment_date = payment_date[:-4]
bgneal@61 194 try:
bgneal@61 195 payment_date = datetime.datetime.strptime(payment_date, PP_DATE_FMT)
bgneal@61 196 except ValueError:
bgneal@316 197 logging.error('IPN: invalid payment_date "%s"', params['payment_date'])
bgneal@61 198 return
bgneal@36 199
bgneal@61 200 try:
bgneal@61 201 donation = Donation(
bgneal@61 202 user=user,
bgneal@61 203 is_anonymous=is_anonymous,
bgneal@61 204 test_ipn=test_ipn,
bgneal@61 205 txn_id=txn_id,
bgneal@61 206 txn_type=txn_type,
bgneal@61 207 first_name=first_name,
bgneal@61 208 last_name=last_name,
bgneal@61 209 payer_email=payer_email,
bgneal@61 210 payer_id=payer_id,
bgneal@61 211 memo=memo,
bgneal@61 212 payer_status=payer_status,
bgneal@61 213 mc_gross=mc_gross,
bgneal@61 214 mc_fee=mc_fee,
bgneal@61 215 payment_date=payment_date)
bgneal@61 216 except:
bgneal@61 217 logging.exception('IPN: exception during donation creation')
bgneal@61 218 else:
bgneal@61 219 donation.save()
bgneal@61 220 logging.info('IPN: donation saved')
bgneal@36 221