Mercurial > public > sg101

annotate donations/views.py @ 1160:b84ce2d7e93d

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
New template for displaying django messages. New common template for rendering django messages in the new V3 Foundation style.
author Brian Neal <bgneal@gmail.com>
date Tue, 24 Jan 2017 19:22:29 -0600
parents 7fb9bc5a1232
children fbfb1a9c70e2
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@1031 9 from django.shortcuts import render
bgneal@35 10 from django.conf import settings
bgneal@35 11 from django.contrib.sites.models import Site
bgneal@36 12 from django.http import HttpResponse
bgneal@36 13 from django.contrib.auth.models import User
bgneal@238 14 from django.views.decorators.csrf import csrf_exempt
bgneal@1079 15 from django.views.generic import TemplateView
bgneal@238 16
bgneal@35 17
bgneal@35 18 from donations.models import Donation
bgneal@35 19
bgneal@63 20 PP_DATE_FMT = '%H:%M:%S %b %d, %Y'
bgneal@35 21
bgneal@36 22 def paypal_params():
bgneal@36 23 """
bgneal@36 24 This function returns a tuple where the 1st element is the Paypal
bgneal@36 25 URL and the 2nd element is the Paypal business email. This information
bgneal@36 26 depends on the setting DONATIONS_DEBUG.
bgneal@36 27 """
bgneal@36 28 if settings.DONATIONS_DEBUG:
bgneal@35 29 form_action = 'https://www.sandbox.paypal.com/cgi-bin/webscr'
bgneal@35 30 business = settings.DONATIONS_BUSINESS_DEBUG
bgneal@35 31 else:
bgneal@35 32 form_action = 'https://www.paypal.com/cgi-bin/webscr'
bgneal@35 33 business = settings.DONATIONS_BUSINESS
bgneal@35 34
bgneal@36 35 return form_action, business
bgneal@36 36
bgneal@36 37
bgneal@316 38 def verify_request(params):
bgneal@316 39 """
bgneal@316 40 Send the parameters back to Paypal and return the response string.
bgneal@316 41 """
bgneal@316 42 # If we are doing localhost-type unit tests, just return whatever
bgneal@316 43 # the test wants us to...
bgneal@316 44 if hasattr(settings, 'DONATIONS_DEBUG_VERIFY_RESPONSE'):
bgneal@316 45 return settings.DONATIONS_DEBUG_VERIFY_RESPONSE
bgneal@316 46
bgneal@316 47 req = urllib2.Request(paypal_params()[0], params)
bgneal@316 48 req.add_header("Content-type", "application/x-www-form-urlencoded")
bgneal@316 49 try:
bgneal@316 50 response = urllib2.urlopen(req)
bgneal@1031 51 except urllib2.URLError as ex:
bgneal@1031 52 logging.exception('IPN: exception verifying IPN: %s', ex)
bgneal@316 53 return None
bgneal@316 54
bgneal@316 55 return response.read()
bgneal@316 56
bgneal@316 57
bgneal@36 58 def index(request):
bgneal@36 59 gross, net, donations = Donation.objects.monthly_stats()
bgneal@1087 60 goal = settings.DONATIONS_GOAL
bgneal@36 61 current_site = Site.objects.get_current()
bgneal@36 62 form_action, business = paypal_params()
bgneal@36 63
bgneal@1087 64 pct = max(0, min(100, int(net / goal * 100)))
bgneal@1087 65
bgneal@1031 66 return render(request, 'donations/index.html', {
bgneal@1087 67 'goal': goal,
bgneal@35 68 'gross': gross,
bgneal@35 69 'net': net,
bgneal@35 70 'left': settings.DONATIONS_GOAL - net,
bgneal@1087 71 'pct': pct,
bgneal@35 72 'donations': donations,
bgneal@35 73 'form_action': form_action,
bgneal@35 74 'business': business,
bgneal@35 75 'anonymous': settings.DONATIONS_ANON_NAME,
bgneal@35 76 'item_name': settings.DONATIONS_ITEM_NAME,
bgneal@35 77 'item_number': settings.DONATIONS_ITEM_NUM,
bgneal@35 78 'item_anon_number': settings.DONATIONS_ITEM_ANON_NUM,
bgneal@35 79 'domain': current_site.domain,
bgneal@1079 80 'V3_DESIGN': True,
bgneal@1031 81 })
bgneal@35 82
bgneal@35 83
bgneal@1079 84 class ThanksView(TemplateView):
bgneal@1079 85 template_name = 'donations/thanks.html'
bgneal@1079 86
bgneal@1079 87 def get_context_data(self, **kwargs):
bgneal@1079 88 context = super(ThanksView, self).get_context_data(**kwargs)
bgneal@1079 89 context['V3_DESIGN'] = True
bgneal@1079 90 return context
bgneal@1079 91
bgneal@1079 92
bgneal@238 93 @csrf_exempt
bgneal@35 94 def ipn(request):
bgneal@36 95 """
bgneal@36 96 This function is the IPN listener and handles the IPN POST from Paypal.
bgneal@39 97 The algorithm here roughly follows the outline described in chapter 2
bgneal@39 98 of Paypal's IPNGuide.pdf "Implementing an IPN Listener".
bgneal@316 99
bgneal@39 100 """
bgneal@39 101 # Log some info about this IPN event
bgneal@39 102 ip = request.META.get('REMOTE_ADDR', '?')
bgneal@39 103 parameters = request.POST.copy()
bgneal@316 104 logging.info('IPN from %s; post data: %s', ip, parameters.urlencode())
bgneal@35 105
bgneal@39 106 # Now we follow the instructions in chapter 2 of the Paypal IPNGuide.pdf.
bgneal@39 107 # Create a request that contains exactly the same IPN variables and values in
bgneal@39 108 # the same order, preceded with cmd=_notify-validate
bgneal@39 109 parameters['cmd']='_notify-validate'
bgneal@36 110
bgneal@316 111 # Post the request back to Paypal (either to the sandbox or the real deal),
bgneal@316 112 # and read the response:
bgneal@316 113 status = verify_request(parameters.urlencode())
bgneal@39 114 if status != 'VERIFIED':
bgneal@316 115 logging.warning('IPN: Payapl did not verify; status was %s', status)
bgneal@39 116 return HttpResponse()
bgneal@36 117
bgneal@39 118 # Response was VERIFIED; act on this if it is a Completed donation,
bgneal@39 119 # otherwise don't handle it (we are just a donations application. Here
bgneal@39 120 # is where we could be expanded to be a more general payment processor).
bgneal@36 121
bgneal@39 122 payment_status = parameters.get('payment_status')
bgneal@39 123 if payment_status != 'Completed':
bgneal@316 124 logging.info('IPN: payment_status is %s; we are done.', payment_status)
bgneal@39 125 return HttpResponse()
bgneal@39 126
bgneal@39 127 # Is this a donation to the site?
bgneal@39 128 item_number = parameters.get('item_number')
bgneal@316 129 if (item_number == settings.DONATIONS_ITEM_NUM or
bgneal@316 130 item_number == settings.DONATIONS_ITEM_ANON_NUM):
bgneal@39 131 process_donation(item_number, parameters)
bgneal@39 132 else:
bgneal@39 133 logging.info('IPN: not a donation; done.')
bgneal@39 134
bgneal@39 135 return HttpResponse()
bgneal@36 136
bgneal@36 137
bgneal@36 138 def process_donation(item_number, params):
bgneal@36 139 """
bgneal@39 140 A few validity and duplicate checks are made on the donation params.
bgneal@316 141 If everything is ok, construct a donation object from the parameters and
bgneal@39 142 store it in the database.
bgneal@316 143
bgneal@36 144 """
bgneal@36 145 # Has this transaction been processed before?
bgneal@39 146 txn_id = params.get('txn_id')
bgneal@39 147 if txn_id is None:
bgneal@39 148 logging.error('IPN: missing txn_id')
bgneal@36 149 return
bgneal@39 150
bgneal@36 151 try:
bgneal@36 152 donation = Donation.objects.get(txn_id__exact=txn_id)
bgneal@36 153 except Donation.DoesNotExist:
bgneal@36 154 pass
bgneal@36 155 else:
bgneal@39 156 logging.warning('IPN: duplicate txn_id')
bgneal@36 157 return # no exception, this is a duplicate
bgneal@36 158
bgneal@36 159 # Is the email address ours?
bgneal@36 160 business = params.get('business')
bgneal@36 161 if business != paypal_params()[1]:
bgneal@316 162 logging.warning('IPN: invalid business: %s', business)
bgneal@36 163 return
bgneal@36 164
bgneal@36 165 # is this a payment received?
bgneal@36 166 txn_type = params.get('txn_type')
bgneal@36 167 if txn_type != 'web_accept':
bgneal@316 168 logging.warning('IPN: invalid txn_type: %s', txn_type)
bgneal@36 169 return
bgneal@316 170
bgneal@36 171 # Looks like a donation, save it to the database.
bgneal@36 172 # Determine which user this came from, if any.
bgneal@36 173 # The username is stored in the custom field if the user was logged in when
bgneal@36 174 # the donation was made.
bgneal@36 175 user = None
bgneal@65 176 if 'custom' in params and params['custom']:
bgneal@36 177 try:
bgneal@36 178 user = User.objects.get(username__exact=params['custom'])
bgneal@36 179 except User.DoesNotExist:
bgneal@36 180 pass
bgneal@36 181
bgneal@36 182 is_anonymous = item_number == settings.DONATIONS_ITEM_ANON_NUM
bgneal@36 183 test_ipn = params.get('test_ipn') == '1'
bgneal@36 184
bgneal@36 185 first_name = params.get('first_name', '')
bgneal@36 186 last_name = params.get('last_name', '')
bgneal@36 187 payer_email = params.get('payer_email', '')
bgneal@36 188 payer_id = params.get('payer_id', '')
bgneal@36 189 memo = params.get('memo', '')
bgneal@36 190 payer_status = params.get('payer_status', '')
bgneal@36 191
bgneal@36 192 try:
bgneal@36 193 mc_gross = decimal.Decimal(params['mc_gross'])
bgneal@36 194 mc_fee = decimal.Decimal(params['mc_fee'])
bgneal@36 195 except KeyError, decimal.InvalidOperation:
bgneal@39 196 logging.error('IPN: invalid/missing mc_gross or mc_fee')
bgneal@36 197 return
bgneal@36 198
bgneal@61 199 payment_date = params.get('payment_date')
bgneal@61 200 if payment_date is None:
bgneal@61 201 logging.error('IPN: missing payment_date')
bgneal@36 202 return
bgneal@36 203
bgneal@61 204 # strip off the timezone
bgneal@61 205 payment_date = payment_date[:-4]
bgneal@61 206 try:
bgneal@61 207 payment_date = datetime.datetime.strptime(payment_date, PP_DATE_FMT)
bgneal@61 208 except ValueError:
bgneal@316 209 logging.error('IPN: invalid payment_date "%s"', params['payment_date'])
bgneal@61 210 return
bgneal@36 211
bgneal@61 212 try:
bgneal@61 213 donation = Donation(
bgneal@61 214 user=user,
bgneal@61 215 is_anonymous=is_anonymous,
bgneal@61 216 test_ipn=test_ipn,
bgneal@61 217 txn_id=txn_id,
bgneal@61 218 txn_type=txn_type,
bgneal@61 219 first_name=first_name,
bgneal@61 220 last_name=last_name,
bgneal@61 221 payer_email=payer_email,
bgneal@61 222 payer_id=payer_id,
bgneal@61 223 memo=memo,
bgneal@61 224 payer_status=payer_status,
bgneal@61 225 mc_gross=mc_gross,
bgneal@61 226 mc_fee=mc_fee,
bgneal@61 227 payment_date=payment_date)
bgneal@61 228 except:
bgneal@61 229 logging.exception('IPN: exception during donation creation')
bgneal@61 230 else:
bgneal@61 231 donation.save()
bgneal@61 232 logging.info('IPN: donation saved')