Add normalization and optional uniqueness to partner_email_check

- partner_email_check now uses email-validator instead of
  validate_email
- Email addresses are normalized
- There is a setting to enforce uniqueness of partner email addresses
- There is a setting to check whether emails are
  deliverable (i.e. whether the domain resolves)

partner_email_check/README.rst

@@ -6,12 +6,27 @@
 Partner Email Check
 ===================
 
-This module validate the field ``email`` in the module ``res.partner``.
+This module validates and normalizes the field ``email`` in the model
+``res.partner``.
+
+As part of the normalization, email addresses are converted to lowercase.
+
+Optionally, multiple partners can not be allowed to have the same address.
+This will not work with multiple comma-separated email addresses in the field,
+although validation and normalization are still supported in such cases.
 
 Configuration
 =============
 
-Install python package validate_email: ``sudo pip install validate_email``.
+Install python package email-validator: ``sudo pip install email-validator``.
+
+To not allow multiple partners to have the same email address, use the
+"Filter duplicate email addresses"/``partner_email_check_filter_duplicates``
+setting.
+
+To validate that email addresses are deliverable (that the hostname exists),
+use the "Check deliverability of email addresses"/``partner_email_check_check_deliverability``
+setting.
 
 Usage
 =====

partner_email_check/__manifest__.py

@@ -8,11 +8,14 @@
     'author': "Komit, Odoo Community Association (OCA)",
     'website': 'https://github.com/OCA/partner-contact',
     'category': 'Tools',
-    'depends': ['base'],
+    'depends': ['base_setup'],
     'installable': True,
     'application': False,
     'license': 'AGPL-3',
     'external_dependencies': {
-        'python': ['validate_email']
+        'python': ['email_validator']
     },
+    'data': [
+        'views/base_config_view.xml',
+    ]
 }

partner_email_check/models/__init__.py

@@ -1,3 +1,4 @@
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
 
+from . import res_config_settings
 from . import res_partner

partner_email_check/models/res_config_settings.py

@@ -0,0 +1,42 @@
+from odoo import api, fields, models
+
+
+class ResConfigSettings(models.TransientModel):
+    _inherit = 'res.config.settings'
+
+    partner_email_check_filter_duplicates = fields.Boolean(
+        string="Filter duplicate partner email addresses",
+        help="Don't allow multiple partners to have the same email address.",
+    )
+
+    partner_email_check_check_deliverability = fields.Boolean(
+        string="Check deliverability of email addresses",
+        help="Don't allow email addresses with providers that don't exist",
+    )
+
+    @api.model
+    def get_values(self):
+        res = super(ResConfigSettings, self).get_values()
+        conf = self.env['ir.config_parameter'].sudo()
+        res.update(
+            partner_email_check_filter_duplicates=conf.get_param(
+                'partner_email_check_filter_duplicates', 'False'
+            ) == 'True',
+            partner_email_check_check_deliverability=conf.get_param(
+                'partner_email_check_check_deliverability', 'False'
+            ) == 'True',
+        )
+        return res
+
+    @api.multi
+    def set_values(self):
+        super(ResConfigSettings, self).set_values()
+        conf = self.env['ir.config_parameter'].sudo()
+        conf.set_param(
+            'partner_email_check_filter_duplicates',
+            self.partner_email_check_filter_duplicates
+        )
+        conf.set_param(
+            'partner_email_check_check_deliverability',
+            self.partner_email_check_check_deliverability
+        )

partner_email_check/models/res_partner.py

@@ -3,32 +3,89 @@
 
 import logging
 from odoo import api, models, _
-from odoo.exceptions import UserError
+from odoo.exceptions import UserError, ValidationError
 
 _logger = logging.getLogger(__name__)
 
 try:
-    from validate_email import validate_email
+    from email_validator import (
+        validate_email,
+        EmailSyntaxError,
+        EmailUndeliverableError,
+    )
 except ImportError:
-    _logger.debug('Cannot import "validate_email".')
+    _logger.debug('Cannot import "email_validator".')
 
-    def validate_email(email):
-        _logger.warning(
-            'Can not validate email, '
-            'python dependency required "validate_email"')
-        return True
+    validate_email = None
 
 
 class ResPartner(models.Model):
     _inherit = 'res.partner'
 
+    @api.model
+    def email_check(self, emails):
+        return ','.join(self._normalize_email(email.strip())
+                        for email in emails.split(','))
+
     @api.constrains('email')
-    def constrains_email(self):
-        for rec in self.filtered("email"):
-            self.email_check(rec.email)
+    def _check_email_unique(self):
+        if self._should_filter_duplicates():
+            for rec in self.filtered("email"):
+                if ',' in rec.email:
+                    raise UserError(
+                        _("Field contains multiple email addresses. This is "
+                          "not supported when duplicate email addresses are "
+                          "not allowed.")
+                    )
+                if self.search_count(
+                    [('email', '=', rec.email), ('id', '!=', rec.id)]
+                ):
+                    raise UserError(
+                        _("Email '%s' is already in use.") % rec.email.strip()
+                    )
+
+    def _normalize_email(self, email):
+        if validate_email is None:
+            _logger.warning(
+                'Can not validate email, '
+                'python dependency required "email_validator"')
+            return email
+
+        try:
+            result = validate_email(
+                email,
+                check_deliverability=self._should_check_deliverability(),
+            )
+        except EmailSyntaxError:
+            raise ValidationError(
+                _("%s is an invalid email") % email.strip()
+            )
+        except EmailUndeliverableError:
+            raise ValidationError(
+                _("Cannot deliver to email address %s") % email.strip()
+            )
+        return result['local'].lower() + '@' + result['domain_i18n']
+
+    def _should_filter_duplicates(self):
+        conf = self.env['ir.config_parameter'].get_param(
+            'partner_email_check_filter_duplicates', 'False'
+        )
+        return conf == 'True'
+
+    def _should_check_deliverability(self):
+        conf = self.env['ir.config_parameter'].get_param(
+            'partner_email_check_check_deliverability', 'False'
+        )
+        return conf == 'True'
 
     @api.model
-    def email_check(self, email):
-        if validate_email(email):
-            return True
-        raise UserError(_('Invalid e-mail!'))
+    def create(self, vals):
+        if vals.get('email'):
+            vals['email'] = self.email_check(vals['email'])
+        return super(ResPartner, self).create(vals)
+
+    @api.multi
+    def write(self, vals):
+        if vals.get('email'):
+            vals['email'] = self.email_check(vals['email'])
+        return super(ResPartner, self).write(vals)

partner_email_check/tests/test_partner_email_check.py

@@ -1,8 +1,11 @@
 # Copyright 2019 Komit <https://komit-consulting.com>
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
 
+from unittest.mock import patch
+
 from odoo.exceptions import ValidationError
 from odoo.tests.common import TransactionCase
+from odoo.tools.misc import mute_logger
 
 
 class TestPartnerEmailCheck(TransactionCase):
@@ -11,6 +14,10 @@ class TestPartnerEmailCheck(TransactionCase):
         self.test_partner = self.env['res.partner'].create({
             'name': 'test',
         })
+        self.wizard = self.env['res.config.settings'].create({})
+        self.wizard.partner_email_check_filter_duplicates = False
+        self.wizard.partner_email_check_check_deliverability = False
+        self.wizard.set_values()
 
     def test_bad_email(self):
         """Test rejection of bad emails."""
@@ -21,3 +28,122 @@ class TestPartnerEmailCheck(TransactionCase):
         """Test acceptance of good"""
         self.test_partner.email = 'goodemail@domain.com'
         self.assertTrue(self.test_partner.email)
+
+    def test_bad_emails(self):
+        """Test rejection of bad emails."""
+        with self.assertRaises(ValidationError):
+            self.test_partner.email = 'good@domain.com,bad@email@domain..com'
+
+    def test_good_emails(self):
+        """Test acceptance of good"""
+        self.test_partner.email = 'goodemail@domain.com,goodemail2@domain.com'
+        self.assertTrue(self.test_partner.email)
+
+    def test_email_domain_normalization(self):
+        """Test normalization of email domain names, including punycode."""
+        self.test_partner.write({'email': 'goodemail@xn--xamPle-9ua.com'})
+        self.assertEqual(self.test_partner.email, u'goodemail@éxample.com')
+
+    def test_multi_email_domain_normalization(self):
+        """Test normalization of email domain names of multiple addresses."""
+        self.test_partner.write({
+            'email': 'goodemail@doMAIN.com,othergood@xn--xample-9ua.com'
+        })
+        self.assertEqual(
+            self.test_partner.email,
+            u'goodemail@domain.com,othergood@éxample.com'
+        )
+
+    def test_email_local_normalization(self):
+        """Test normalization of the local part of email addresses."""
+        self.test_partner.write({'email': 'Me@mail.org'})
+        # .lower() is locale-dependent, so don't hardcode the result
+        self.assertEqual(self.test_partner.email, 'Me'.lower() + '@mail.org')
+
+    def test_multi_email_local_normalization(self):
+        """Test normalization of the local part of multiple addresses."""
+        self.test_partner.write({'email': 'You@mAiL.net,mE@mail.com'})
+        self.assertEqual(
+            self.test_partner.email,
+            'You'.lower() + '@mail.net,' + 'mE'.lower() + '@mail.com'
+        )
+
+    def disallow_duplicates(self):
+        self.wizard.partner_email_check_filter_duplicates = True
+        self.wizard.set_values()
+
+    def test_duplicate_addresses_disallowed(self):
+        self.disallow_duplicates()
+        self.test_partner.write({'email': 'email@domain.tld'})
+        with self.assertRaises(ValidationError):
+            self.env['res.partner'].create({
+                'name': 'alsotest',
+                'email': 'email@domain.tld'
+            })
+
+    def test_duplicate_after_normalization_addresses_disallowed(self):
+        self.disallow_duplicates()
+        self.env['res.partner'].create({
+            'name': 'alsotest',
+            'email': 'email@doMAIN.tld'
+        })
+        with self.assertRaises(ValidationError):
+            self.test_partner.email = 'email@domain.tld'
+
+    def test_multiple_addresses_disallowed_when_duplicates_filtered(self):
+        self.disallow_duplicates()
+        with self.assertRaises(ValidationError):
+            self.test_partner.email = 'foo@bar.org,email@domain.tld'
+
+    def test_duplicate_addresses_allowed_by_default(self):
+        self.env['res.partner'].create({
+            'name': 'alsotest',
+            'email': 'email@domain.tld',
+        })
+        self.test_partner.email = 'email@domain.tld'
+
+    def check_deliverability(self):
+        self.wizard.partner_email_check_check_deliverability = True
+        self.wizard.set_values()
+
+    def test_deliverable_addresses_allowed(self):
+        self.check_deliverability()
+        # We only need a resolving domain, not a real user
+        self.test_partner.email = 'gooddomain-icraglusrk@gmail.com'
+        self.assertTrue(self.test_partner.email)
+
+    def test_nondeliverable_addresses_not_allowed(self):
+        self.check_deliverability()
+        with self.assertRaises(ValidationError):
+            # This domain may resolve by mistake on certain network setups
+            # At least until a new version of email-validator is released
+            # See https://github.com/JoshData/python-email-validator/pull/30
+            self.test_partner.email = 'cezrik@acoa.nrdkt'
+
+    def test_config_getters(self):
+        other_wizard = self.env['res.config.settings'].create({})
+        self.assertFalse(other_wizard.partner_email_check_check_deliverability)
+        self.assertFalse(other_wizard.partner_email_check_filter_duplicates)
+        self.disallow_duplicates()
+        self.check_deliverability()
+        other_wizard = self.env['res.config.settings'].create({})
+        self.assertTrue(other_wizard.partner_email_check_check_deliverability)
+        self.assertTrue(other_wizard.partner_email_check_filter_duplicates)
+
+    @mute_logger('odoo.addons.partner_email_check.models.res_partner')
+    def test_lacking_dependency_does_not_halt_execution(self):
+        with patch('odoo.addons.partner_email_check.models.res_partner.'
+                   'validate_email', None):
+            self.test_partner.email = 'notatallvalid@@domain'
+
+    @mute_logger('odoo.addons.partner_email_check.models.res_partner')
+    def test_lacking_dependency_keeps_uniqueness_constraint_working(self):
+        self.disallow_duplicates()
+        with patch('odoo.addons.partner_email_check.models.res_partner.'
+                   'validate_email', None):
+            self.env['res.partner'].create({
+                'name': 'alsotest',
+                'email': 'email@domain.tld'
+            })
+            with self.assertRaises(ValidationError):
+                self.test_partner.email = 'email@domain.tld'

partner_email_check/views/base_config_view.xml

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <record id="view_general_configuration" model="ir.ui.view">
+        <field name="name">partner_email_check</field>
+        <field name="model">res.config.settings</field>
+        <field name="inherit_id"
+               ref="base_setup.res_config_settings_view_form" />
+        <field name="arch" type="xml">
+            <xpath expr="//div[@name='multi_company']" position='after'>
+                <h2>Email validation</h2>
+                <div class="row mt16 o_settings_container"
+                     name="partner_email_check">
+                    <div class="col-xs-12 col-md-6 o_setting_box">
+                        <div class="o_setting_left_pane">
+                            <field name="partner_email_check_filter_duplicates" />
+                        </div>
+                        <div class="o_setting_right_pane">
+                            <label for="partner_email_check_filter_duplicates" />
+                            <div class="text-muted">
+                                Require partner email addresses to be unique
+                            </div>
+                        </div>
+                    </div>
+                    <div class="col-xs-12 col-md-6 o_setting_box">
+                        <div class="o_setting_left_pane">
+                            <field name="partner_email_check_check_deliverability" />
+                        </div>
+                        <div class="o_setting_right_pane">
+                            <label for="partner_email_check_check_deliverability" />
+                            <div class="text-muted">
+                                Ensure that partner email addresses can be delivered to
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </xpath>
+        </field>
+    </record>
+</odoo>