django-anymail/tests/test_mailgun_backend.py

# -*- coding: utf-8 -*-

from __future__ import unicode_literals

from datetime import date, datetime
from decimal import Decimal
from email.mime.base import MIMEBase
from email.mime.image import MIMEImage

from django.core import mail
from django.core.exceptions import ImproperlyConfigured
from django.test import SimpleTestCase
from django.test.utils import override_settings
from django.utils.timezone import get_fixed_timezone, override as override_current_timezone

from anymail.exceptions import AnymailAPIError, AnymailSerializationError, AnymailUnsupportedFeature
from anymail.message import attach_inline_image_file

from .mock_requests_backend import RequestsBackendMockAPITestCase, SessionSharingTestCasesMixin
from .utils import sample_image_content, sample_image_path, SAMPLE_IMAGE_FILENAME, AnymailTestMixin


@override_settings(EMAIL_BACKEND='anymail.backends.mailgun.MailgunBackend',
                   ANYMAIL={'MAILGUN_API_KEY': 'test_api_key'})
class MailgunBackendMockAPITestCase(RequestsBackendMockAPITestCase):
    DEFAULT_RAW_RESPONSE = b"""{
        "id": "<20160306015544.116301.25145@example.com>",
        "message": "Queued. Thank you."
    }"""

    def setUp(self):
        super(MailgunBackendMockAPITestCase, self).setUp()
        # Simple message useful for many tests
        self.message = mail.EmailMultiAlternatives('Subject', 'Text Body', 'from@example.com', ['to@example.com'])


class MailgunBackendStandardEmailTests(MailgunBackendMockAPITestCase):
    """Test backend support for Django standard email features"""

    def test_send_mail(self):
        """Test basic API for simple send"""
        mail.send_mail('Subject here', 'Here is the message.',
                       'from@example.com', ['to@example.com'], fail_silently=False)
        self.assert_esp_called('/example.com/messages')
        auth = self.get_api_call_auth()
        self.assertEqual(auth, ('api', 'test_api_key'))
        data = self.get_api_call_data()
        self.assertEqual(data['subject'], "Subject here")
        self.assertEqual(data['text'], "Here is the message.")
        self.assertEqual(data['from'], "from@example.com")
        self.assertEqual(data['to'], ["to@example.com"])

    def test_name_addr(self):
        """Make sure RFC2822 name-addr format (with display-name) is allowed

        (Test both sender and recipient addresses)
        """
        msg = mail.EmailMessage(
            'Subject', 'Message', 'From Name <from@example.com>',
            ['Recipient #1 <to1@example.com>', 'to2@example.com'],
            cc=['Carbon Copy <cc1@example.com>', 'cc2@example.com'],
            bcc=['Blind Copy <bcc1@example.com>', 'bcc2@example.com'])
        msg.send()
        data = self.get_api_call_data()
        self.assertEqual(data['from'], "From Name <from@example.com>")
        self.assertEqual(data['to'], ['Recipient #1 <to1@example.com>', 'to2@example.com'])
        self.assertEqual(data['cc'], ['Carbon Copy <cc1@example.com>', 'cc2@example.com'])
        self.assertEqual(data['bcc'], ['Blind Copy <bcc1@example.com>', 'bcc2@example.com'])

    def test_email_message(self):
        email = mail.EmailMessage(
            'Subject', 'Body goes here', 'from@example.com',
            ['to1@example.com', 'Also To <to2@example.com>'],
            bcc=['bcc1@example.com', 'Also BCC <bcc2@example.com>'],
            cc=['cc1@example.com', 'Also CC <cc2@example.com>'],
            headers={'Reply-To': 'another@example.com',
                     'X-MyHeader': 'my value',
                     'Message-ID': 'mycustommsgid@example.com'})
        email.send()
        data = self.get_api_call_data()
        self.assertEqual(data['subject'], "Subject")
        self.assertEqual(data['text'], "Body goes here")
        self.assertEqual(data['from'], "from@example.com")
        self.assertEqual(data['to'], ['to1@example.com', 'Also To <to2@example.com>'])
        self.assertEqual(data['bcc'], ['bcc1@example.com', 'Also BCC <bcc2@example.com>'])
        self.assertEqual(data['cc'], ['cc1@example.com', 'Also CC <cc2@example.com>'])
        self.assertEqual(data['h:Reply-To'], "another@example.com")
        self.assertEqual(data['h:X-MyHeader'], 'my value')
        self.assertEqual(data['h:Message-ID'], 'mycustommsgid@example.com')

    def test_html_message(self):
        text_content = 'This is an important message.'
        html_content = '<p>This is an <strong>important</strong> message.</p>'
        email = mail.EmailMultiAlternatives('Subject', text_content,
                                            'from@example.com', ['to@example.com'])
        email.attach_alternative(html_content, "text/html")
        email.send()
        data = self.get_api_call_data()
        self.assertEqual(data['text'], text_content)
        self.assertEqual(data['html'], html_content)
        # Don't accidentally send the html part as an attachment:
        files = self.get_api_call_files(required=False)
        self.assertIsNone(files)

    def test_html_only_message(self):
        html_content = '<p>This is an <strong>important</strong> message.</p>'
        email = mail.EmailMessage('Subject', html_content, 'from@example.com', ['to@example.com'])
        email.content_subtype = "html"  # Main content is now text/html
        email.send()
        data = self.get_api_call_data()
        self.assertNotIn('text', data)
        self.assertEqual(data['html'], html_content)

    def test_reply_to(self):
        # reply_to is new in Django 1.8 -- before that, you can simply include it in headers
        try:
            # noinspection PyArgumentList
            email = mail.EmailMessage('Subject', 'Body goes here', 'from@example.com', ['to1@example.com'],
                                      reply_to=['reply@example.com', 'Other <reply2@example.com>'],
                                      headers={'X-Other': 'Keep'})
        except TypeError:
            # Pre-Django 1.8
            return self.skipTest("Django version doesn't support EmailMessage(reply_to)")
        email.send()
        data = self.get_api_call_data()
        self.assertEqual(data['h:Reply-To'], 'reply@example.com, Other <reply2@example.com>')
        self.assertEqual(data['h:X-Other'], 'Keep')  # don't lose other headers

    def test_attachments(self):
        text_content = "* Item one\n* Item two\n* Item three"
        self.message.attach(filename="test.txt", content=text_content, mimetype="text/plain")

        # Should guess mimetype if not provided...
        png_content = b"PNG\xb4 pretend this is the contents of a png file"
        self.message.attach(filename="test.png", content=png_content)

        # Should work with a MIMEBase object (also tests no filename)...
        pdf_content = b"PDF\xb4 pretend this is valid pdf data"
        mimeattachment = MIMEBase('application', 'pdf')
        mimeattachment.set_payload(pdf_content)
        self.message.attach(mimeattachment)

        self.message.send()
        files = self.get_api_call_files()
        attachments = [value for (field, value) in files if field == 'attachment']
        self.assertEqual(len(attachments), 3)
        self.assertEqual(attachments[0], ('test.txt', text_content, 'text/plain'))
        self.assertEqual(attachments[1], ('test.png', png_content, 'image/png'))  # type inferred from filename
        self.assertEqual(attachments[2], (None, pdf_content, 'application/pdf'))  # no filename
        # Make sure the image attachment is not treated as embedded:
        inlines = [value for (field, value) in files if field == 'inline']
        self.assertEqual(len(inlines), 0)

    def test_unicode_attachment_correctly_decoded(self):
        # Slight modification from the Django unicode docs:
        # http://django.readthedocs.org/en/latest/ref/unicode.html#email
        self.message.attach("Une pièce jointe.html", '<p>\u2019</p>', mimetype='text/html')
        self.message.send()
        files = self.get_api_call_files()
        attachments = [value for (field, value) in files if field == 'attachment']
        self.assertEqual(len(attachments), 1)

    def test_embedded_images(self):
        image_filename = SAMPLE_IMAGE_FILENAME
        image_path = sample_image_path(image_filename)
        image_data = sample_image_content(image_filename)

        cid = attach_inline_image_file(self.message, image_path)
        html_content = '<p>This has an <img src="cid:%s" alt="inline" /> image.</p>' % cid
        self.message.attach_alternative(html_content, "text/html")

        self.message.send()
        data = self.get_api_call_data()
        self.assertEqual(data['html'], html_content)

        files = self.get_api_call_files()
        inlines = [value for (field, value) in files if field == 'inline']
        self.assertEqual(len(inlines), 1)
        self.assertEqual(inlines[0], (cid, image_data, "image/png"))  # filename is cid; type is guessed
        # Make sure neither the html nor the inline image is treated as an attachment:
        attachments = [value for (field, value) in files if field == 'attachment']
        self.assertEqual(len(attachments), 0)

    def test_attached_images(self):
        image_filename = SAMPLE_IMAGE_FILENAME
        image_path = sample_image_path(image_filename)
        image_data = sample_image_content(image_filename)

        self.message.attach_file(image_path)  # option 1: attach as a file

        image = MIMEImage(image_data)  # option 2: construct the MIMEImage and attach it directly
        self.message.attach(image)

        self.message.send()
        files = self.get_api_call_files()
        attachments = [value for (field, value) in files if field == 'attachment']
        self.assertEqual(len(attachments), 2)
        self.assertEqual(attachments[0], (image_filename, image_data, 'image/png'))
        self.assertEqual(attachments[1], (None, image_data, 'image/png'))  # name unknown -- not attached as file
        # Make sure the image attachments are not treated as inline:
        inlines = [value for (field, value) in files if field == 'inline']
        self.assertEqual(len(inlines), 0)

    def test_multiple_html_alternatives(self):
        # Multiple alternatives not allowed
        self.message.attach_alternative("<p>First html is OK</p>", "text/html")
        self.message.attach_alternative("<p>But not second html</p>", "text/html")
        with self.assertRaises(AnymailUnsupportedFeature):
            self.message.send()

    def test_html_alternative(self):
        # Only html alternatives allowed
        self.message.attach_alternative("{'not': 'allowed'}", "application/json")
        with self.assertRaises(AnymailUnsupportedFeature):
            self.message.send()

    def test_alternatives_fail_silently(self):
        # Make sure fail_silently is respected
        self.message.attach_alternative("{'not': 'allowed'}", "application/json")
        sent = self.message.send(fail_silently=True)
        self.assert_esp_not_called("API should not be called when send fails silently")
        self.assertEqual(sent, 0)

    def test_suppress_empty_address_lists(self):
        """Empty to, cc, bcc, and reply_to shouldn't generate empty headers"""
        self.message.send()
        data = self.get_api_call_data()
        self.assertNotIn('cc', data)
        self.assertNotIn('bcc', data)
        self.assertNotIn('h:Reply-To', data)

        # Test empty `to` -- but send requires at least one recipient somewhere (like cc)
        self.message.to = []
        self.message.cc = ['cc@example.com']
        self.message.send()
        data = self.get_api_call_data()
        self.assertNotIn('to', data)

    def test_api_failure(self):
        self.set_mock_response(status_code=400)
        with self.assertRaises(AnymailAPIError):
            sent = mail.send_mail('Subject', 'Body', 'from@example.com', ['to@example.com'])
            self.assertEqual(sent, 0)

        # Make sure fail_silently is respected
        self.set_mock_response(status_code=400)
        sent = mail.send_mail('Subject', 'Body', 'from@example.com', ['to@example.com'], fail_silently=True)
        self.assertEqual(sent, 0)

    def test_api_error_includes_details(self):
        """AnymailAPIError should include ESP's error message"""
        # JSON error response:
        error_response = b"""{"message": "Helpful explanation from your ESP"}"""
        self.set_mock_response(status_code=400, raw=error_response)
        with self.assertRaisesMessage(AnymailAPIError, "Helpful explanation from your ESP"):
            self.message.send()

        # Non-JSON error response:
        self.set_mock_response(status_code=500, raw=b"Invalid API key")
        with self.assertRaisesMessage(AnymailAPIError, "Invalid API key"):
            self.message.send()

        # No content in the error response:
        self.set_mock_response(status_code=502, raw=None)
        with self.assertRaises(AnymailAPIError):
            self.message.send()


class MailgunBackendAnymailFeatureTests(MailgunBackendMockAPITestCase):
    """Test backend support for Anymail added features"""

    def test_metadata(self):
        self.message.metadata = {'user_id': "12345", 'items': ['mail', 'gun']}
        self.message.send()
        data = self.get_api_call_data()
        # note values get serialized to json:
        self.assertEqual(data['v:user_id'], '12345')  # simple values are transmitted as-is
        self.assertEqual(data['v:items'], '["mail", "gun"]')  # complex values get json-serialized

    def test_send_at(self):
        utc_plus_6 = get_fixed_timezone(6 * 60)
        utc_minus_8 = get_fixed_timezone(-8 * 60)

        with override_current_timezone(utc_plus_6):
            # Timezone-aware datetime converted to UTC:
            self.message.send_at = datetime(2016, 3, 4, 5, 6, 7, tzinfo=utc_minus_8)
            self.message.send()
            data = self.get_api_call_data()
            self.assertEqual(data['o:deliverytime'], "Fri, 04 Mar 2016 13:06:07 GMT")  # 05:06 UTC-8 == 13:06 UTC

            # Timezone-naive datetime assumed to be Django current_timezone
            self.message.send_at = datetime(2022, 10, 11, 12, 13, 14, 567)
            self.message.send()
            data = self.get_api_call_data()
            self.assertEqual(data['o:deliverytime'], "Tue, 11 Oct 2022 06:13:14 GMT")  # 12:13 UTC+6 == 06:13 UTC

            # Date-only treated as midnight in current timezone
            self.message.send_at = date(2022, 10, 22)
            self.message.send()
            data = self.get_api_call_data()
            self.assertEqual(data['o:deliverytime'], "Fri, 21 Oct 2022 18:00:00 GMT")  # 00:00 UTC+6 == 18:00-1d UTC

            # POSIX timestamp
            self.message.send_at = 1651820889  # 2022-05-06 07:08:09 UTC
            self.message.send()
            data = self.get_api_call_data()
            self.assertEqual(data['o:deliverytime'], "Fri, 06 May 2022 07:08:09 GMT")

            # String passed unchanged (this is *not* portable between ESPs)
            self.message.send_at = "Thu, 13 Oct 2022 18:02:00 GMT"
            self.message.send()
            data = self.get_api_call_data()
            self.assertEqual(data['o:deliverytime'], "Thu, 13 Oct 2022 18:02:00 GMT")

    def test_tags(self):
        self.message.tags = ["receipt", "repeat-user"]
        self.message.send()
        data = self.get_api_call_data()
        self.assertEqual(data['o:tag'], ["receipt", "repeat-user"])

    def test_tracking(self):
        # Test one way...
        self.message.track_opens = True
        self.message.track_clicks = False
        self.message.send()
        data = self.get_api_call_data()
        self.assertEqual(data['o:tracking-opens'], 'yes')
        self.assertEqual(data['o:tracking-clicks'], 'no')

        # ...and the opposite way
        self.message.track_opens = False
        self.message.track_clicks = True
        self.message.send()
        data = self.get_api_call_data()
        self.assertEqual(data['o:tracking-opens'], 'no')
        self.assertEqual(data['o:tracking-clicks'], 'yes')

    def test_sender_domain(self):
        """Mailgun send domain can come from from_email or esp_extra"""
        # You could also use ANYMAIL_SEND_DEFAULTS={'esp_extra': {'sender_domain': 'your-domain.com'}}
        # (The mailgun_integration_tests do that.)
        self.message.from_email = "Test From <from@from-email.example.com>"
        self.message.send()
        self.assert_esp_called('/from-email.example.com/messages')  # API url includes the sender-domain

        self.message.esp_extra = {'sender_domain': 'esp-extra.example.com'}
        self.message.send()
        self.assert_esp_called('/esp-extra.example.com/messages')  # overrides from_email

    def test_default_omits_options(self):
        """Make sure by default we don't send any ESP-specific options.

        Options not specified by the caller should be omitted entirely from
        the API call (*not* sent as False or empty). This ensures
        that your ESP account settings apply by default.
        """
        self.message.send()
        self.assert_esp_called('/example.com/messages')
        data = self.get_api_call_data()
        mailgun_fields = {key: value for key, value in data.items()
                          if key.startswith('o:') or key.startswith('v:')}
        self.assertEqual(mailgun_fields, {})

    # noinspection PyUnresolvedReferences
    def test_send_attaches_anymail_status(self):
        """ The anymail_status should be attached to the message when it is sent """
        response_content = b"""{
            "id": "<12345.67890@example.com>",
            "message": "Queued. Thank you."
        }"""
        self.set_mock_response(raw=response_content)
        msg = mail.EmailMessage('Subject', 'Message', 'from@example.com', ['to1@example.com'],)
        sent = msg.send()
        self.assertEqual(sent, 1)
        self.assertEqual(msg.anymail_status.status, {'queued'})
        self.assertEqual(msg.anymail_status.message_id, '<12345.67890@example.com>')
        self.assertEqual(msg.anymail_status.recipients['to1@example.com'].status, 'queued')
        self.assertEqual(msg.anymail_status.recipients['to1@example.com'].message_id, '<12345.67890@example.com>')
        self.assertEqual(msg.anymail_status.esp_response.content, response_content)

    # noinspection PyUnresolvedReferences
    def test_send_failed_anymail_status(self):
        """ If the send fails, anymail_status should contain initial values"""
        self.set_mock_response(status_code=500)
        sent = self.message.send(fail_silently=True)
        self.assertEqual(sent, 0)
        self.assertIsNone(self.message.anymail_status.status)
        self.assertIsNone(self.message.anymail_status.message_id)
        self.assertEqual(self.message.anymail_status.recipients, {})
        self.assertIsNone(self.message.anymail_status.esp_response)

    # noinspection PyUnresolvedReferences
    def test_send_unparsable_response(self):
        """If the send succeeds, but a non-JSON API response, should raise an API exception"""
        mock_response = self.set_mock_response(status_code=200,
                                               raw=b"yikes, this isn't a real response")
        with self.assertRaises(AnymailAPIError):
            self.message.send()
        self.assertIsNone(self.message.anymail_status.status)
        self.assertIsNone(self.message.anymail_status.message_id)
        self.assertEqual(self.message.anymail_status.recipients, {})
        self.assertEqual(self.message.anymail_status.esp_response, mock_response)

    def test_json_serialization_errors(self):
        """Try to provide more information about non-json-serializable data"""
        self.message.metadata = {'total': Decimal('19.99')}
        with self.assertRaises(AnymailSerializationError) as cm:
            self.message.send()
            print(self.get_api_call_data())
        err = cm.exception
        self.assertIsInstance(err, TypeError)  # compatibility with json.dumps
        self.assertIn("Don't know how to send this data to Mailgun", str(err))  # our added context
        self.assertIn("Decimal('19.99') is not JSON serializable", str(err))  # original message


class MailgunBackendRecipientsRefusedTests(MailgunBackendMockAPITestCase):
    """Should raise AnymailRecipientsRefused when *all* recipients are rejected or invalid"""

    # Mailgun doesn't check email bounce or complaint lists at time of send --
    # it always just queues the message. You'll need to listen for the "rejected"
    # and "failed" events to detect refused recipients.

    # The one exception is a completely invalid email, which will return a 400 response
    # and show up as an AnymailAPIError at send time.
    INVALID_TO_RESPONSE = b"""{
        "message": "'to' parameter is not a valid address. please check documentation"
    }"""

    def test_invalid_email(self):
        self.set_mock_response(status_code=400, raw=self.INVALID_TO_RESPONSE)
        msg = mail.EmailMessage('Subject', 'Body', 'from@example.com', to=['not a valid email'])
        with self.assertRaises(AnymailAPIError):
            msg.send()

    def test_fail_silently(self):
        self.set_mock_response(status_code=400, raw=self.INVALID_TO_RESPONSE)
        sent = mail.send_mail('Subject', 'Body', 'from@example.com', ['not a valid email'],
                              fail_silently=True)
        self.assertEqual(sent, 0)


class MailgunBackendSessionSharingTestCase(SessionSharingTestCasesMixin, MailgunBackendMockAPITestCase):
    """Requests session sharing tests"""
    pass  # tests are defined in the mixin


@override_settings(ANYMAIL_SEND_DEFAULTS={
    'metadata': {'global': 'globalvalue', 'other': 'othervalue'},
    'tags': ['globaltag'],
    'track_clicks': True,
    'track_opens': True,
    'esp_extra': {'o:globaloption': 'globalsetting'},
})
class MailgunBackendSendDefaultsTests(MailgunBackendMockAPITestCase):
    """Tests backend support for global SEND_DEFAULTS"""

    def test_send_defaults(self):
        """Test that global send defaults are applied"""
        self.message.send()
        data = self.get_api_call_data()
        # All these values came from ANYMAIL_SEND_DEFAULTS:
        self.assertEqual(data['v:global'], 'globalvalue')
        self.assertEqual(data['v:other'], 'othervalue')
        self.assertEqual(data['o:tag'], ['globaltag'])
        self.assertEqual(data['o:tracking-clicks'], 'yes')
        self.assertEqual(data['o:tracking-opens'], 'yes')
        self.assertEqual(data['o:globaloption'], 'globalsetting')

    def test_merge_message_with_send_defaults(self):
        """Test that individual message settings are *merged into* the global send defaults"""
        self.message.metadata = {'message': 'messagevalue', 'other': 'override'}
        self.message.tags = ['messagetag']
        self.message.track_clicks = False
        self.message.esp_extra = {'o:messageoption': 'messagesetting'}

        self.message.send()
        data = self.get_api_call_data()
        # All these values came from ANYMAIL_SEND_DEFAULTS + message.*:
        self.assertEqual(data['v:global'], 'globalvalue')
        self.assertEqual(data['v:message'], 'messagevalue')  # additional metadata
        self.assertEqual(data['v:other'], 'override')  # override global value
        self.assertEqual(data['o:tag'], ['globaltag', 'messagetag'])  # tags concatenated
        self.assertEqual(data['o:tracking-clicks'], 'no')  # message overrides
        self.assertEqual(data['o:tracking-opens'], 'yes')
        self.assertEqual(data['o:globaloption'], 'globalsetting')
        self.assertEqual(data['o:messageoption'], 'messagesetting')  # additional esp_extra

    @override_settings(ANYMAIL_MAILGUN_SEND_DEFAULTS={
        'tags': ['esptag'],
        'metadata': {'esp': 'espvalue'},
        'track_opens': False,
    })
    def test_esp_send_defaults(self):
        """Test that ESP-specific send defaults override individual global defaults"""
        self.message.send()
        data = self.get_api_call_data()
        # All these values came from ANYMAIL_SEND_DEFAULTS plus ANYMAIL_MAILGUN_SEND_DEFAULTS:
        self.assertNotIn('v:global', data)  # entire metadata overridden
        self.assertEqual(data['v:esp'], 'espvalue')
        self.assertEqual(data['o:tag'], ['esptag'])  # entire tags overridden
        self.assertEqual(data['o:tracking-clicks'], 'yes')  # we didn't override the global track_clicks
        self.assertEqual(data['o:tracking-opens'], 'no')
        self.assertEqual(data['o:globaloption'], 'globalsetting')  # we didn't override the global esp_extra


@override_settings(EMAIL_BACKEND="anymail.backends.mailgun.MailgunBackend")
class MailgunBackendImproperlyConfiguredTests(SimpleTestCase, AnymailTestMixin):
    """Test ESP backend without required settings in place"""

    def test_missing_api_key(self):
        with self.assertRaises(ImproperlyConfigured) as cm:
            mail.send_mail('Subject', 'Message', 'from@example.com', ['to@example.com'])
        errmsg = str(cm.exception)
        # Make sure the error mentions MAILGUN_API_KEY and ANYMAIL_MAILGUN_API_KEY
        self.assertRegex(errmsg, r'\bMAILGUN_API_KEY\b')
        self.assertRegex(errmsg, r'\bANYMAIL_MAILGUN_API_KEY\b')