Beispiel #1
0
 def test_pay_preapproval_no_retry(self, post_pay):
     post_pay.side_effect = client.Error('nope', code='539012')
     with self.assertRaises(client.Error):
         client.pay(self.data, retry=False)
     eq_(post_pay.call_count, 1)
     args = post_pay.call_args_list[0][1]
     eq_(args['data']['use_preapproval'], True)
Beispiel #2
0
 def test_pay_preapproval_no_retry(self, post_pay):
     post_pay.side_effect = client.Error("nope", code="539012")
     with self.assertRaises(client.Error):
         client.pay(self.data, retry=False)
     eq_(post_pay.call_count, 1)
     args = post_pay.call_args_list[0][1]
     eq_(args["data"]["use_preapproval"], True)
Beispiel #3
0
 def test_pay_preapproval_no_retry(self, post_pay):
     post_pay.side_effect = client.Error('nope', code='539012')
     with self.assertRaises(client.Error):
         client.pay(self.data, retry=False)
     eq_(post_pay.call_count, 1)
     args = post_pay.call_args_list[0][1]
     eq_(args['data']['use_preapproval'], True)
Beispiel #4
0
 def test_pay_preapproval(self, post_pay):
     post_pay.side_effect = client.Error('nope', code='539012')
     with self.assertRaises(client.Error):
         data = self.data
         data['buyer'] = self.user
         client.pay(data)
     eq_(post_pay.call_count, 2)
     args = post_pay.call_args_list[1][1]
     eq_(args['data']['use_preapproval'], False)
Beispiel #5
0
 def test_pay_preapproval(self, post_pay):
     post_pay.side_effect = client.Error("nope", code="539012")
     with self.assertRaises(client.Error):
         data = self.data
         data["buyer"] = self.user
         client.pay(data)
     eq_(post_pay.call_count, 2)
     args = post_pay.call_args_list[1][1]
     eq_(args["data"]["use_preapproval"], False)
Beispiel #6
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 def test_pay_preapproval(self, post_pay):
     post_pay.side_effect = client.Error('nope', code='539012')
     with self.assertRaises(client.Error):
         data = self.data
         data['buyer'] = self.user
         client.pay(data)
     eq_(post_pay.call_count, 2)
     args = post_pay.call_args_list[1][1]
     eq_(args['data']['use_preapproval'], False)
Beispiel #7
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    def test_pay(self, post_pay):
        # Temporary until we get AMO solitude support.
        if not settings.MARKETPLACE:
            raise SkipTest

        client.pay({'amount':1, 'currency':'USD', 'seller':self.addon,
                    'memo':'foo'})
        kwargs = post_pay.call_args[1]['data']
        assert 'ipn_url' in kwargs
        assert 'uuid' in kwargs
        assert kwargs['uuid']in kwargs['return_url']
Beispiel #8
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 def test_pay_non_absolute_url(self, post_pay):
     data = self.data
     data["complete"] = "/bar"
     client.pay(data)
     eq_(post_pay.call_args[1]["data"]["return_url"], "http://foo.com/bar")
Beispiel #9
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 def test_pay_not_preapproval(self, post_pay):
     post_pay.side_effect = client.Error('nope', code='0')
     with self.assertRaises(client.Error):
         client.pay(self.data)
     # It did not retry because this is not a pre-approval error.
     eq_(post_pay.call_count, 1)
Beispiel #10
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 def test_pay(self, post_pay):
     client.pay(self.data)
     kwargs = post_pay.call_args[1]['data']
     assert 'ipn_url' in kwargs
     assert 'uuid' in kwargs
     assert kwargs['uuid'] in kwargs['return_url']
Beispiel #11
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 def test_pay_no_url(self, post_pay):
     client.pay(self.data)
     assert 'uuid' in post_pay.call_args[1]['data']['return_url']
Beispiel #12
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 def test_pay_non_absolute_url(self, post_pay):
     data = self.data
     data['complete'] = '/bar'
     client.pay(data)
     eq_(post_pay.call_args[1]['data']['return_url'], 'http://foo.com/bar')
Beispiel #13
0
def pay(request, signed_req, pay_req):
    paykey, status = "", ""
    preapproval = None
    if request.amo_user:
        preapproval = request.amo_user.get_preapproval()
    tier, price, currency = _get_price(pay_req, preapproval=preapproval)

    source = request.POST.get("source", "")
    product = pay_req["_config"].addon
    # L10n: {0} is the product name. {1} is the application name.
    contrib_for = _(u"Firefox Marketplace in-app payment for {0} to {1}").format(
        pay_req["request"]["name"], product.name
    )
    # TODO(solitude): solitude lib will create these for us.
    uuid_ = hashlib.md5(str(uuid.uuid4())).hexdigest()

    if waffle.flag_is_active(request, "solitude-payments"):
        # TODO(solitude): when the migration of data is completed, we
        # will be able to remove this. Seller data is populated in solitude
        # on submission or devhub changes. If those don't occur, you won't be
        # able to sell at all.
        client.create_seller_for_pay(product)

        complete = reverse("inapp_pay.pay_status", args=[pay_req["_config"].pk, "complete"])
        cancel = reverse("inapp_pay.pay_status", args=[pay_req["_config"].pk, "cancel"])

        # TODO(bug 748137): remove retry is False.
        try:
            result = client.pay(
                {
                    "amount": price,
                    "currency": currency,
                    "buyer": request.amo_user,
                    "seller": product,
                    "memo": contrib_for,
                    "complete": complete,
                    "cancel": cancel,
                },
                retry=False,
            )
        except client.Error as exc:
            paypal.paypal_log_cef(
                request, product, uuid_, "in-app PayKey Failure", "PAYKEYFAIL", "There was an error getting the paykey"
            )
            log.error(u"Error getting paykey, in-app payment: %s" % pay_req["_config"].pk, exc_info=True)
            InappPayLog.log(request, "PAY_ERROR", config=pay_req["_config"])
            return render_error(request, exc)

        # TODO(solitude): just use the dictionary when solitude is live.
        paykey = result.get("pay_key", "")
        status = result.get("status", "")
        uuid_ = result.get("uuid", "")

    else:
        try:
            paykey, status = paypal.get_paykey(
                dict(
                    amount=price,
                    chains=settings.PAYPAL_CHAINS,
                    currency=currency,
                    email=product.paypal_id,
                    ip=request.META.get("REMOTE_ADDR"),
                    memo=contrib_for,
                    pattern="inapp_pay.pay_status",
                    preapproval=preapproval,
                    qs={"realurl": request.POST.get("realurl")},
                    slug=pay_req["_config"].pk,  # passed to pay_done()
                    # via reverse()
                    uuid=uuid_,
                )
            )
        except paypal.PaypalError, exc:
            paypal.paypal_log_cef(
                request, product, uuid_, "in-app PayKey Failure", "PAYKEYFAIL", "There was an error getting the paykey"
            )
            log.error(u"Error getting paykey, in-app payment: %s" % pay_req["_config"].pk, exc_info=True)
            InappPayLog.log(request, "PAY_ERROR", config=pay_req["_config"])
            return render_error(request, exc)
Beispiel #14
0
def purchase(request, addon):
    amount, currency, uuid_, contrib_for = start_purchase(request, addon)

    if not amount:
        # We won't write a contribution row for this because there
        # will not be a valid Paypal transaction. But we have to write the
        # Purchase row, something that writing to the contribution normally
        # does for us.
        AddonPurchase.objects.safer_get_or_create(addon=addon,
                                                  user=request.amo_user)
        return http.HttpResponse(json.dumps({'url': '', 'paykey': '',
                                             'error': '',
                                             'status': 'COMPLETED'}),
                                 content_type='application/json')

    paykey, status, error = '', '', ''

    # TODO(solitude): remove this, pre-approval and currency will be
    # stored in solitude.
    preapproval = None
    if (not waffle.flag_is_active(request, 'solitude-payments')
        and request.amo_user):
        preapproval = request.amo_user.get_preapproval()
        # User the users default currency.
        if currency == 'USD' and preapproval and preapproval.currency:
            currency = preapproval.currency

    if waffle.flag_is_active(request, 'solitude-payments'):
        # Now call the client.
        result = {}
        try:
            result = client.pay({'amount': amount, 'currency': currency,
                                 'buyer': request.amo_user, 'seller': addon,
                                 'memo': contrib_for})
        except client.Error as error:
            # Note that by assigning this to error, it will go into the return
            # value for the json. General solitude errors will then be
            # reported back to the user.
            paypal.paypal_log_cef(request, addon, uuid_,
                                  'PayKey Failure', 'PAYKEYFAIL',
                                  'There was an error getting the paykey')
            log.error('Error getting paykey: %s' % addon.pk, exc_info=True)

        # TODO(solitude): just use the dictionary when solitude is live.
        paykey = result.get('pay_key', '')
        status = result.get('status', '')
        uuid_ = result.get('uuid', '')

    else:
        # TODO(solitude): remove this when solitude goes live.
        try:
            paykey, status = paypal.get_paykey(dict(
                amount=amount,
                chains=settings.PAYPAL_CHAINS,
                currency=currency,
                email=addon.paypal_id,
                ip=request.META.get('REMOTE_ADDR'),
                memo=contrib_for,
                pattern='purchase.done',
                preapproval=preapproval,
                qs={'realurl': request.POST.get('realurl')},
                slug=addon.app_slug,
                uuid=uuid_
            ))
        except paypal.PaypalError as error:
            paypal.paypal_log_cef(request, addon, uuid_,
                                  'PayKey Failure', 'PAYKEYFAIL',
                                  'There was an error getting the paykey')
            log.error('Error getting paykey, purchase of addon: %s' % addon.pk,
                      exc_info=True)

    if paykey:
        # TODO(solitude): at some point we'll have to see what to do with
        # contributions.
        download_source = request.REQUEST.get('src', '')
        contrib = Contribution(addon_id=addon.id, amount=amount,
                               source=download_source,
                               source_locale=request.LANG,
                               uuid=str(uuid_), type=amo.CONTRIB_PENDING,
                               paykey=paykey, user=request.amo_user,
                               price_tier=addon.premium.price,
                               client_data=ClientData.get_or_create(request))

        log.debug('Storing contrib for uuid: %s' % uuid_)

        # If this was a pre-approval, it's completed already, we'll
        # double check this with PayPal, just to be sure nothing went wrong.
        if status == 'COMPLETED':
            paypal.paypal_log_cef(request, addon, uuid_,
                                  'Purchase', 'PURCHASE',
                                  'A user purchased using pre-approval')

            log.debug('Status completed for uuid: %s' % uuid_)
            if waffle.flag_is_active(request, 'solitude-payments'):
                result = client.post_pay_check(data={'pay_key': paykey})
                if result['status'] == 'COMPLETED':
                    contrib.type = amo.CONTRIB_PURCHASE
                else:
                    log.error('Check purchase failed on uuid: %s' % uuid_)
                    status = 'NOT-COMPLETED'

            else:
                #TODO(solitude): remove this when solitude goes live.
                if paypal.check_purchase(paykey) == 'COMPLETED':
                    log.debug('Check purchase completed for uuid: %s' % uuid_)
                    contrib.type = amo.CONTRIB_PURCHASE
                else:
                    # In this case PayPal disagreed, we should not be trusting
                    # what get_paykey said. Which is a worry.
                    log.error('Check purchase failed on uuid: %s' % uuid_)
                    status = 'NOT-COMPLETED'

        contrib.save()

    else:
        log.error('No paykey present for uuid: %s' % uuid_)

    log.debug('Got paykey for addon: %s by user: %s'
              % (addon.pk, request.amo_user.pk))
    url = '%s?paykey=%s' % (settings.PAYPAL_FLOW_URL, paykey)
    if request.POST.get('result_type') == 'json' or request.is_ajax():
        return http.HttpResponse(json.dumps({'url': url,
                                             'paykey': paykey,
                                             'error': str(error),
                                             'status': status}),
                                 content_type='application/json')

    # This is the non-Ajax fallback.
    if status != 'COMPLETED':
        return http.HttpResponseRedirect(url)

    messages.success(request, _('Purchase complete'))
    return http.HttpResponseRedirect(addon.get_detail_url())
Beispiel #15
0
 def test_pay_no_url(self, post_pay):
     client.pay(self.data)
     assert 'uuid' in post_pay.call_args[1]['data']['return_url']
Beispiel #16
0
def purchase(request, addon):
    amount, currency, uuid_, contrib_for = start_purchase(request, addon)

    if not amount:
        # We won't write a contribution row for this because there
        # will not be a valid Paypal transaction. But we have to write the
        # Purchase row, something that writing to the contribution normally
        # does for us.
        AddonPurchase.objects.safer_get_or_create(addon=addon,
                                                  user=request.amo_user)
        return http.HttpResponse(json.dumps({
            'url': '',
            'paykey': '',
            'error': '',
            'status': 'COMPLETED'
        }),
                                 content_type='application/json')

    paykey, status, error = '', '', ''

    # TODO(solitude): remove this, pre-approval and currency will be
    # stored in solitude.
    preapproval = None
    if (not waffle.flag_is_active(request, 'solitude-payments')
            and request.amo_user):
        preapproval = request.amo_user.get_preapproval()
        # User the users default currency.
        if currency == 'USD' and preapproval and preapproval.currency:
            currency = preapproval.currency

    if waffle.flag_is_active(request, 'solitude-payments'):
        # Now call the client.
        result = {}
        try:
            result = client.pay({
                'amount': amount,
                'currency': currency,
                'buyer': request.amo_user,
                'seller': addon,
                'memo': contrib_for
            })
        except client.Error as error:
            # Note that by assigning this to error, it will go into the return
            # value for the json. General solitude errors will then be
            # reported back to the user.
            paypal.paypal_log_cef(request, addon, uuid_, 'PayKey Failure',
                                  'PAYKEYFAIL',
                                  'There was an error getting the paykey')
            log.error('Error getting paykey: %s' % addon.pk, exc_info=True)

        # TODO(solitude): just use the dictionary when solitude is live.
        paykey = result.get('pay_key', '')
        status = result.get('status', '')
        uuid_ = result.get('uuid', '')

    else:
        # TODO(solitude): remove this when solitude goes live.
        try:
            paykey, status = paypal.get_paykey(
                dict(amount=amount,
                     chains=settings.PAYPAL_CHAINS,
                     currency=currency,
                     email=addon.paypal_id,
                     ip=request.META.get('REMOTE_ADDR'),
                     memo=contrib_for,
                     pattern='purchase.done',
                     preapproval=preapproval,
                     qs={'realurl': request.POST.get('realurl')},
                     slug=addon.app_slug,
                     uuid=uuid_))
        except paypal.PaypalError as error:
            paypal.paypal_log_cef(request, addon, uuid_, 'PayKey Failure',
                                  'PAYKEYFAIL',
                                  'There was an error getting the paykey')
            log.error('Error getting paykey, purchase of addon: %s' % addon.pk,
                      exc_info=True)

    if paykey:
        # TODO(solitude): at some point we'll have to see what to do with
        # contributions.
        download_source = request.REQUEST.get('src', '')
        contrib = Contribution(addon_id=addon.id,
                               amount=amount,
                               source=download_source,
                               source_locale=request.LANG,
                               uuid=str(uuid_),
                               type=amo.CONTRIB_PENDING,
                               paykey=paykey,
                               user=request.amo_user,
                               price_tier=addon.premium.price,
                               client_data=ClientData.get_or_create(request))

        log.debug('Storing contrib for uuid: %s' % uuid_)

        # If this was a pre-approval, it's completed already, we'll
        # double check this with PayPal, just to be sure nothing went wrong.
        if status == 'COMPLETED':
            paypal.paypal_log_cef(request, addon, uuid_, 'Purchase',
                                  'PURCHASE',
                                  'A user purchased using pre-approval')

            log.debug('Status completed for uuid: %s' % uuid_)
            if waffle.flag_is_active(request, 'solitude-payments'):
                result = client.post_pay_check(data={'pay_key': paykey})
                if result['status'] == 'COMPLETED':
                    contrib.type = amo.CONTRIB_PURCHASE
                else:
                    log.error('Check purchase failed on uuid: %s' % uuid_)
                    status = 'NOT-COMPLETED'

            else:
                #TODO(solitude): remove this when solitude goes live.
                if paypal.check_purchase(paykey) == 'COMPLETED':
                    log.debug('Check purchase completed for uuid: %s' % uuid_)
                    contrib.type = amo.CONTRIB_PURCHASE
                else:
                    # In this case PayPal disagreed, we should not be trusting
                    # what get_paykey said. Which is a worry.
                    log.error('Check purchase failed on uuid: %s' % uuid_)
                    status = 'NOT-COMPLETED'

        contrib.save()

    else:
        log.error('No paykey present for uuid: %s' % uuid_)

    log.debug('Got paykey for addon: %s by user: %s' %
              (addon.pk, request.amo_user.pk))
    url = '%s?paykey=%s' % (settings.PAYPAL_FLOW_URL, paykey)
    if request.POST.get('result_type') == 'json' or request.is_ajax():
        return http.HttpResponse(json.dumps({
            'url': url,
            'paykey': paykey,
            'error': str(error),
            'status': status
        }),
                                 content_type='application/json')

    # This is the non-Ajax fallback.
    if status != 'COMPLETED':
        return http.HttpResponseRedirect(url)

    messages.success(request, _('Purchase complete'))
    return http.HttpResponseRedirect(addon.get_detail_url())
Beispiel #17
0
 def test_pay_not_preapproval(self, post_pay):
     post_pay.side_effect = client.Error("nope", code="0")
     with self.assertRaises(client.Error):
         client.pay(self.data)
     # It did not retry because this is not a pre-approval error.
     eq_(post_pay.call_count, 1)
Beispiel #18
0
 def test_pay(self, post_pay):
     client.pay(self.data)
     kwargs = post_pay.call_args[1]["data"]
     assert "ipn_url" in kwargs
     assert "uuid" in kwargs
     assert kwargs["uuid"] in kwargs["return_url"]
Beispiel #19
0
 def test_pay_non_absolute_url(self, post_pay):
     data = self.data
     data['complete'] = '/bar'
     client.pay(data)
     eq_(post_pay.call_args[1]['data']['return_url'], 'http://foo.com/bar')
Beispiel #20
0
 def test_pay_no_url(self, post_pay):
     client.pay(self.data)
     assert "uuid" in post_pay.call_args[1]["data"]["return_url"]
Beispiel #21
0
def pay(request, signed_req, pay_req):
    paykey, status = '', ''
    preapproval = None
    if request.amo_user:
        preapproval = request.amo_user.get_preapproval()
    tier, price, currency = _get_price(pay_req, preapproval=preapproval)

    source = request.POST.get('source', '')
    product = pay_req['_config'].addon
    # L10n: {0} is the product name. {1} is the application name.
    contrib_for = (_(u'Firefox Marketplace in-app payment for {0} to {1}')
                   .format(pay_req['request']['name'], product.name))
    # TODO(solitude): solitude lib will create these for us.
    uuid_ = hashlib.md5(str(uuid.uuid4())).hexdigest()

    if waffle.flag_is_active(request, 'solitude-payments'):
        # TODO(solitude): when the migration of data is completed, we
        # will be able to remove this. Seller data is populated in solitude
        # on submission or devhub changes. If those don't occur, you won't be
        # able to sell at all.
        client.create_seller_for_pay(product)

        complete = reverse('inapp_pay.pay_status',
                           args=[pay_req['_config'].pk, 'complete'])
        cancel = reverse('inapp_pay.pay_status',
                         args=[pay_req['_config'].pk, 'cancel'])

        # TODO(bug 748137): remove retry is False.
        try:
            result = client.pay({'amount': price, 'currency': currency,
                                 'buyer': request.amo_user, 'seller': product,
                                 'memo': contrib_for, 'complete': complete,
                                 'cancel': cancel}, retry=False)
        except client.Error as exc:
            paypal.paypal_log_cef(request, product, uuid_,
                                  'in-app PayKey Failure', 'PAYKEYFAIL',
                                  'There was an error getting the paykey')
            log.error(u'Error getting paykey, in-app payment: %s'
                      % pay_req['_config'].pk,
                      exc_info=True)
            InappPayLog.log(request, 'PAY_ERROR', config=pay_req['_config'])
            return render_error(request, exc)

        #TODO(solitude): just use the dictionary when solitude is live.
        paykey = result.get('pay_key', '')
        status = result.get('status', '')
        uuid_ = result.get('uuid', '')

    else:
        try:
            paykey, status = paypal.get_paykey(dict(
                amount=price,
                chains=settings.PAYPAL_CHAINS,
                currency=currency,
                email=product.paypal_id,
                ip=request.META.get('REMOTE_ADDR'),
                memo=contrib_for,
                pattern='inapp_pay.pay_status',
                preapproval=preapproval,
                qs={'realurl': request.POST.get('realurl')},
                slug=pay_req['_config'].pk,  # passed to pay_done()
                                             # via reverse()
                uuid=uuid_
            ))
        except paypal.PaypalError, exc:
            paypal.paypal_log_cef(request, product, uuid_,
                                  'in-app PayKey Failure', 'PAYKEYFAIL',
                                  'There was an error getting the paykey')
            log.error(u'Error getting paykey, in-app payment: %s'
                      % pay_req['_config'].pk,
                      exc_info=True)
            InappPayLog.log(request, 'PAY_ERROR', config=pay_req['_config'])
            return render_error(request, exc)
Beispiel #22
0
 def test_pay(self, post_pay):
     client.pay(self.data)
     kwargs = post_pay.call_args[1]['data']
     assert 'ipn_url' in kwargs
     assert 'uuid' in kwargs
     assert kwargs['uuid']in kwargs['return_url']
Beispiel #23
0
def pay(request, signed_req, pay_req):
    paykey, status = '', ''
    preapproval = None
    if request.amo_user:
        preapproval = request.amo_user.get_preapproval()
    tier, price, currency = _get_price(pay_req, preapproval=preapproval)

    source = request.POST.get('source', '')
    product = pay_req['_config'].addon
    # L10n: {0} is the product name. {1} is the application name.
    contrib_for = (
        _(u'Firefox Marketplace in-app payment for {0} to {1}').format(
            pay_req['request']['name'], product.name))
    # TODO(solitude): solitude lib will create these for us.
    uuid_ = hashlib.md5(str(uuid.uuid4())).hexdigest()

    if waffle.flag_is_active(request, 'solitude-payments'):
        # TODO(solitude): when the migration of data is completed, we
        # will be able to remove this. Seller data is populated in solitude
        # on submission or devhub changes. If those don't occur, you won't be
        # able to sell at all.
        client.create_seller_for_pay(product)

        complete = reverse('inapp_pay.pay_status',
                           args=[pay_req['_config'].pk, 'complete'])
        cancel = reverse('inapp_pay.pay_status',
                         args=[pay_req['_config'].pk, 'cancel'])

        # TODO(bug 748137): remove retry is False.
        try:
            result = client.pay(
                {
                    'amount': price,
                    'currency': currency,
                    'buyer': request.amo_user,
                    'seller': product,
                    'memo': contrib_for,
                    'complete': complete,
                    'cancel': cancel
                },
                retry=False)
        except client.Error as exc:
            paypal.paypal_log_cef(request, product, uuid_,
                                  'in-app PayKey Failure', 'PAYKEYFAIL',
                                  'There was an error getting the paykey')
            log.error(u'Error getting paykey, in-app payment: %s' %
                      pay_req['_config'].pk,
                      exc_info=True)
            InappPayLog.log(request, 'PAY_ERROR', config=pay_req['_config'])
            return render_error(request, exc)

        #TODO(solitude): just use the dictionary when solitude is live.
        paykey = result.get('pay_key', '')
        status = result.get('status', '')
        uuid_ = result.get('uuid', '')

    else:
        try:
            paykey, status = paypal.get_paykey(
                dict(
                    amount=price,
                    chains=settings.PAYPAL_CHAINS,
                    currency=currency,
                    email=product.paypal_id,
                    ip=request.META.get('REMOTE_ADDR'),
                    memo=contrib_for,
                    pattern='inapp_pay.pay_status',
                    preapproval=preapproval,
                    qs={'realurl': request.POST.get('realurl')},
                    slug=pay_req['_config'].pk,  # passed to pay_done()
                    # via reverse()
                    uuid=uuid_))
        except paypal.PaypalError, exc:
            paypal.paypal_log_cef(request, product, uuid_,
                                  'in-app PayKey Failure', 'PAYKEYFAIL',
                                  'There was an error getting the paykey')
            log.error(u'Error getting paykey, in-app payment: %s' %
                      pay_req['_config'].pk,
                      exc_info=True)
            InappPayLog.log(request, 'PAY_ERROR', config=pay_req['_config'])
            return render_error(request, exc)
Beispiel #24
0
def purchase(request, addon):
    log.debug('Starting purchase of addon: %s by user: %s'
              % (addon.pk, request.amo_user.pk))
    amount = addon.premium.get_price()
    source = request.POST.get('source', '')
    uuid_ = hashlib.md5(str(uuid.uuid4())).hexdigest()
    # L10n: {0} is the addon name.
    contrib_for = (_(u'Mozilla Marketplace purchase of {0}')
                   .format(addon.name))

    # Default is USD.
    amount, currency = addon.premium.get_price(), 'USD'

    # If tier is specified, then let's look it up.
    if waffle.switch_is_active('currencies'):
        form = PriceCurrencyForm(data=request.POST, addon=addon)
        if form.is_valid():
            tier = form.get_tier()
            if tier:
                amount, currency = tier.price, tier.currency

    if not amount:
        # We won't write a contribution row for this because there
        # will not be a valid Paypal transaction. But we have to write the
        # Purchase row, something that writing to the contribution normally
        # does for us.
        AddonPurchase.objects.safer_get_or_create(addon=addon,
                                                  user=request.amo_user)
        return http.HttpResponse(json.dumps({'url': '', 'paykey': '',
                                             'error': '',
                                             'status': 'COMPLETED'}),
                                 content_type='application/json')

    paykey, status, error = '', '', ''

    # TODO(solitude): remove this, pre-approval and currency will be
    # stored in solitude.
    preapproval = None
    if (not waffle.flag_is_active(request, 'solitude-payments')
        and request.amo_user):
        preapproval = request.amo_user.get_preapproval()
        # User the users default currency.
        if currency == 'USD' and preapproval and preapproval.currency:
            currency = preapproval.currency

    if waffle.flag_is_active(request, 'solitude-payments'):
        # TODO(solitude): when the migration of data is completed, we
        # will be able to remove this. Seller data is populated in solitude
        # on submission or devhub changes. If those don't occur, you won't be
        # able to sell at all.
        client.create_seller_for_pay(addon)

        # Now call the client.
        result = {}
        try:
            result = client.pay({'amount': amount, 'currency': currency,
                                 'buyer': request.amo_user, 'seller': addon,
                                 'memo': contrib_for})
        except client.Error:
            paypal.paypal_log_cef(request, addon, uuid_,
                                  'PayKey Failure', 'PAYKEYFAIL',
                                  'There was an error getting the paykey')
            log.error('Error getting paykey: %s' % addon.pk, exc_info=True)

        # TODO(solitude): just use the dictionary when solitude is live.
        paykey = result.get('pay_key', '')
        status = result.get('status', '')
        uuid_ = result.get('uuid', '')

    else:
        # TODO(solitude): remove this when solitude goes live.
        try:
            paykey, status = paypal.get_paykey(dict(
                amount=amount,
                chains=settings.PAYPAL_CHAINS,
                currency=currency,
                email=addon.paypal_id,
                ip=request.META.get('REMOTE_ADDR'),
                memo=contrib_for,
                pattern='purchase.done',
                preapproval=preapproval,
                qs={'realurl': request.POST.get('realurl')},
                slug=addon.app_slug,
                uuid=uuid_
            ))
        except paypal.PaypalError as error:
            paypal.paypal_log_cef(request, addon, uuid_,
                                  'PayKey Failure', 'PAYKEYFAIL',
                                  'There was an error getting the paykey')
            log.error('Error getting paykey, purchase of addon: %s' % addon.pk,
                      exc_info=True)

    if paykey:
        # TODO(solitude): at some point we'll have to see what to do with
        # contributions.
        contrib = Contribution(addon_id=addon.id, amount=amount,
                               source=source, source_locale=request.LANG,
                               uuid=str(uuid_), type=amo.CONTRIB_PENDING,
                               paykey=paykey, user=request.amo_user)
        log.debug('Storing contrib for uuid: %s' % uuid_)

        # If this was a pre-approval, it's completed already, we'll
        # double check this with PayPal, just to be sure nothing went wrong.
        if status == 'COMPLETED':
            paypal.paypal_log_cef(request, addon, uuid_,
                                  'Purchase', 'PURCHASE',
                                  'A user purchased using pre-approval')

            log.debug('Status completed for uuid: %s' % uuid_)
            if waffle.flag_is_active(request, 'solitude-payments'):
                result = client.post_pay_check(data={'pay_key': paykey})
                if result['status'] == 'COMPLETED':
                    contrib.type = amo.CONTRIB_PURCHASE
                else:
                    log.error('Check purchase failed on uuid: %s' % uuid_)
                    status = 'NOT-COMPLETED'

            else:
                #TODO(solitude): remove this when solitude goes live.
                if paypal.check_purchase(paykey) == 'COMPLETED':
                    log.debug('Check purchase completed for uuid: %s' % uuid_)
                    contrib.type = amo.CONTRIB_PURCHASE
                else:
                    # In this case PayPal disagreed, we should not be trusting
                    # what get_paykey said. Which is a worry.
                    log.error('Check purchase failed on uuid: %s' % uuid_)
                    status = 'NOT-COMPLETED'

        contrib.save()

    else:
        log.error('No paykey present for uuid: %s' % uuid_)

    log.debug('Got paykey for addon: %s by user: %s'
              % (addon.pk, request.amo_user.pk))
    url = '%s?paykey=%s' % (settings.PAYPAL_FLOW_URL, paykey)
    if request.POST.get('result_type') == 'json' or request.is_ajax():
        return http.HttpResponse(json.dumps({'url': url,
                                             'paykey': paykey,
                                             'error': str(error),
                                             'status': status}),
                                 content_type='application/json')

    # This is the non-Ajax fallback.
    if status != 'COMPLETED':
        return redirect(url)

    messages.success(request, _('Purchase complete'))
    return redirect(addon.get_detail_url())