Payment/Paypal: add warning about UTF-8 config

Closes #60

payment_paypal/indico_payment_paypal/plugin.py

@@ -7,6 +7,8 @@
 
 from __future__ import unicode_literals
 
+from flask_pluginengine import render_plugin_template
+
 from wtforms.fields.core import StringField
 from wtforms.fields.html5 import URLField
 from wtforms.validators import DataRequired, Optional
@@ -50,6 +52,10 @@ class PaypalPaymentPlugin(PaymentPluginMixin, IndicoPlugin):
                               'method_name': None,
                               'business': None}
 
+    def init(self):
+        super(PaypalPaymentPlugin, self).init()
+        self.template_hook('event-manage-payment-plugin-before-form', self._get_encoding_warning)
+
     @property
     def logo_url(self):
         return url_for_plugin(self.name + '.static', filename='images/logo.png')
@@ -67,3 +73,7 @@ class PaypalPaymentPlugin(PaymentPluginMixin, IndicoPlugin):
         data['return_url'] = url_for_plugin('payment_paypal.success', registration.locator.uuid, _external=True)
         data['cancel_url'] = url_for_plugin('payment_paypal.cancel', registration.locator.uuid, _external=True)
         data['notify_url'] = url_for_plugin('payment_paypal.notify', registration.locator.uuid, _external=True)
+
+    def _get_encoding_warning(self, plugin=None, event=None):
+        if plugin == self:
+            return render_plugin_template('event_settings_encoding_warning.html')

payment_paypal/indico_payment_paypal/templates/event_settings_encoding_warning.html

@@ -0,0 +1,9 @@
+{% from 'message_box.html' import message_box %}
+
+{% call message_box('warning', fixed_width=true) %}
+    {%- trans link='<a href="https://www.paypal.com/al/smarthelp/article/why-did-i-get-the-error-paypal-cannot-process-this-transaction-because-of-a-problem-with-the-seller%27s-website-ts1628" target="_blank">'|safe, endlink='</a>'|safe -%}
+        Please make sure that you have your PayPal seller account configured to use <strong>UTF-8</strong> by default,
+        otherwise some transactions may end up not being acknowledged by Indico!<br>
+        You can find out how to set this up {{ link }}here{{ endlink }}.
+    {%- endtrans -%}
+{% endcall %}

payment_paypal/setup.py

@@ -12,7 +12,7 @@ from setuptools import find_packages, setup
 
 setup(
     name='indico-plugin-payment-paypal',
-    version='1.0',
+    version='2.2-dev',
     description='PayPal payments for Indico event registration fees',
     url='https://github.com/indico/indico-plugins',
     license='MIT',
@@ -22,7 +22,7 @@ setup(
     zip_safe=False,
     include_package_data=True,
     install_requires=[
-        'indico>=2.0'
+        'indico>=2.2.dev0'
     ],
     classifiers=[
         'Environment :: Plugins',