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Resend: new ESP (#341)
Add support for Resend.com backend and webhooks. Closes #341
This commit is contained in:
Mike Edmunds
GitHub
572
tests/test_resend_backend.py
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572
tests/test_resend_backend.py
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@@ -0,0 +1,572 @@
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import json
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from base64 import b64encode
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from decimal import Decimal
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from email.mime.base import MIMEBase
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from email.mime.image import MIMEImage
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from email.utils import formataddr
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from django.core import mail
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from django.core.exceptions import ImproperlyConfigured
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from django.test import SimpleTestCase, override_settings, tag
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from anymail.exceptions import (
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AnymailAPIError,
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AnymailSerializationError,
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AnymailUnsupportedFeature,
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)
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from anymail.message import attach_inline_image_file
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from .mock_requests_backend import (
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RequestsBackendMockAPITestCase,
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SessionSharingTestCases,
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)
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from .utils import (
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SAMPLE_IMAGE_FILENAME,
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AnymailTestMixin,
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decode_att,
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sample_image_content,
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sample_image_path,
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)
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@tag("resend")
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@override_settings(
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EMAIL_BACKEND="anymail.backends.resend.EmailBackend",
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ANYMAIL={
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"RESEND_API_KEY": "test_api_key",
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},
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)
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class ResendBackendMockAPITestCase(RequestsBackendMockAPITestCase):
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DEFAULT_RAW_RESPONSE = b'{"id": "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"}'
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def setUp(self):
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super().setUp()
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# Simple message useful for many tests
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self.message = mail.EmailMultiAlternatives(
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"Subject", "Text Body", "from@example.com", ["to@example.com"]
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)
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@tag("resend")
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class ResendBackendStandardEmailTests(ResendBackendMockAPITestCase):
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"""Test backend support for Django standard email features"""
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def test_send_mail(self):
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"""Test basic API for simple send"""
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mail.send_mail(
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"Subject here",
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"Here is the message.",
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"from@sender.example.com",
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["to@example.com"],
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fail_silently=False,
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)
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self.assert_esp_called("/emails")
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headers = self.get_api_call_headers()
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self.assertEqual(headers["Authorization"], "Bearer test_api_key")
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data = self.get_api_call_json()
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self.assertEqual(data["subject"], "Subject here")
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self.assertEqual(data["text"], "Here is the message.")
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self.assertEqual(data["from"], "from@sender.example.com")
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self.assertEqual(data["to"], ["to@example.com"])
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def test_name_addr(self):
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"""Make sure RFC2822 name-addr format (with display-name) is allowed
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(Test both sender and recipient addresses)
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"""
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msg = mail.EmailMessage(
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"Subject",
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"Message",
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"From Name <from@example.com>",
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["Recipient #1 <to1@example.com>", "to2@example.com"],
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cc=["Carbon Copy <cc1@example.com>", "cc2@example.com"],
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bcc=["Blind Copy <bcc1@example.com>", "bcc2@example.com"],
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)
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msg.send()
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data = self.get_api_call_json()
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self.assertEqual(data["from"], "From Name <from@example.com>")
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self.assertEqual(
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data["to"], ["Recipient #1 <to1@example.com>", "to2@example.com"]
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)
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self.assertEqual(
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data["cc"], ["Carbon Copy <cc1@example.com>", "cc2@example.com"]
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)
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self.assertEqual(
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data["bcc"], ["Blind Copy <bcc1@example.com>", "bcc2@example.com"]
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)
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def test_display_name_workarounds(self):
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# Resend's API has a bug that rejects a display-name in double quotes
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# (per RFC 5322 section 3.4). Attempting to omit the quotes works, unless
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# the display-name also contains a comma. Try to avoid the whole problem
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# by using RFC 2047 encoded words for addresses Resend will parse incorrectly.
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msg = mail.EmailMessage(
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"Subject",
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"Message",
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formataddr(("Félix Företag, Inc.", "from@example.com")),
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[
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'"To, comma" <to1@example.com>',
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"non–ascii <to2@example.com>",
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"=?utf-8?q?pre_encoded?= <to3@example.com>",
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],
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reply_to=['"Reply, comma" <reply1@example.com>'],
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)
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msg.send()
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data = self.get_api_call_json()
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self.assertEqual(
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data["from"],
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# for `from` field only, avoid RFC 2047 and retain non-ASCII characters:
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'"Félix Företag, Inc." <from@example.com>',
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)
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self.assertEqual(
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data["to"],
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[
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"=?utf-8?q?To=2C_comma?= <to1@example.com>",
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"=?utf-8?b?bm9u4oCTYXNjaWk=?= <to2@example.com>",
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"=?utf-8?q?pre_encoded?= <to3@example.com>",
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],
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)
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self.assertEqual(
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data["reply_to"], ["=?utf-8?q?Reply=2C_comma?= <reply1@example.com>"]
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)
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@override_settings(ANYMAIL_RESEND_WORKAROUND_DISPLAY_NAME_BUGS=False)
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def test_undocumented_workaround_setting(self):
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# Same test as above, but workarounds disabled
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msg = mail.EmailMessage(
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"Subject",
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"Message",
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'"Félix Företag" <from@example.com>',
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[
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'"To, comma" <to1@example.com>',
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"non–ascii <to2@example.com>",
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"=?utf-8?q?pre_encoded?= <to3@example.com>",
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],
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reply_to=['"Reply, comma" <reply1@example.com>'],
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)
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msg.send()
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data = self.get_api_call_json()
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self.assertEqual(
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data["from"],
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# (Django uses base64 encoded word unless QP is shorter)
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"=?utf-8?b?RsOpbGl4IEbDtnJldGFn?= <from@example.com>",
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)
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self.assertEqual(
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data["to"],
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[
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'"To, comma" <to1@example.com>',
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"=?utf-8?b?bm9u4oCTYXNjaWk=?= <to2@example.com>",
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"=?utf-8?q?pre_encoded?= <to3@example.com>",
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],
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)
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self.assertEqual(data["reply_to"], ['"Reply, comma" <reply1@example.com>'])
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def test_email_message(self):
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email = mail.EmailMessage(
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"Subject",
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"Body goes here",
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"from@example.com",
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["to1@example.com", "Also To <to2@example.com>"],
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bcc=["bcc1@example.com", "Also BCC <bcc2@example.com>"],
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cc=["cc1@example.com", "Also CC <cc2@example.com>"],
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reply_to=["another@example.com"],
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headers={
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"X-MyHeader": "my value",
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},
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)
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email.send()
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data = self.get_api_call_json()
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self.assertEqual(data["subject"], "Subject")
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self.assertEqual(data["text"], "Body goes here")
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self.assertEqual(data["from"], "from@example.com")
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self.assertEqual(data["to"], ["to1@example.com", "Also To <to2@example.com>"])
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self.assertEqual(
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data["bcc"], ["bcc1@example.com", "Also BCC <bcc2@example.com>"]
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)
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self.assertEqual(data["cc"], ["cc1@example.com", "Also CC <cc2@example.com>"])
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self.assertEqual(data["reply_to"], ["another@example.com"])
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self.assertCountEqual(
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data["headers"],
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{"X-MyHeader": "my value"},
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)
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def test_html_message(self):
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text_content = "This is an important message."
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html_content = "<p>This is an <strong>important</strong> message.</p>"
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email = mail.EmailMultiAlternatives(
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"Subject", text_content, "from@example.com", ["to@example.com"]
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)
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email.attach_alternative(html_content, "text/html")
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email.send()
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data = self.get_api_call_json()
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self.assertEqual(data["text"], text_content)
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self.assertEqual(data["html"], html_content)
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# Don't accidentally send the html part as an attachment:
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self.assertNotIn("attachments", data)
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def test_html_only_message(self):
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html_content = "<p>This is an <strong>important</strong> message.</p>"
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email = mail.EmailMessage(
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"Subject", html_content, "from@example.com", ["to@example.com"]
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)
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email.content_subtype = "html" # Main content is now text/html
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email.send()
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data = self.get_api_call_json()
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self.assertNotIn("text", data)
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self.assertEqual(data["html"], html_content)
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def test_extra_headers(self):
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self.message.extra_headers = {"X-Custom": "string", "X-Num": 123}
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self.message.send()
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data = self.get_api_call_json()
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# header values must be strings (or they'll cause an "invalid literal" API error)
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self.assertEqual(data["headers"], {"X-Custom": "string", "X-Num": "123"})
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def test_extra_headers_serialization_error(self):
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self.message.extra_headers = {"X-Custom": Decimal(12.5)}
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with self.assertRaisesMessage(AnymailSerializationError, "Decimal"):
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self.message.send()
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def test_reply_to(self):
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email = mail.EmailMessage(
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"Subject",
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"Body goes here",
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"from@example.com",
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["to1@example.com"],
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reply_to=["reply@example.com", "Other <reply2@example.com>"],
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)
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email.send()
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data = self.get_api_call_json()
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self.assertEqual(
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data["reply_to"], ["reply@example.com", "Other <reply2@example.com>"]
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)
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def test_attachments(self):
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text_content = "* Item one\n* Item two\n* Item three"
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self.message.attach(
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filename="test.txt", content=text_content, mimetype="text/plain"
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)
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# Should guess mimetype if not provided...
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png_content = b"PNG\xb4 pretend this is the contents of a png file"
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self.message.attach(filename="test.png", content=png_content)
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# Should work with a MIMEBase object (also tests no filename)...
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pdf_content = b"PDF\xb4 pretend this is valid pdf data"
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mimeattachment = MIMEBase("application", "pdf")
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mimeattachment.set_payload(pdf_content)
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self.message.attach(mimeattachment)
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self.message.send()
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data = self.get_api_call_json()
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attachments = data["attachments"]
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self.assertEqual(len(attachments), 3)
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self.assertEqual(attachments[0]["filename"], "test.txt")
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self.assertEqual(
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decode_att(attachments[0]["content"]).decode("ascii"), text_content
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)
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self.assertEqual(attachments[1]["filename"], "test.png")
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self.assertEqual(decode_att(attachments[1]["content"]), png_content)
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# unnamed attachment given default name with correct extension for content type
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self.assertEqual(attachments[2]["filename"], "attachment.pdf")
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self.assertEqual(decode_att(attachments[2]["content"]), pdf_content)
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def test_unicode_attachment_correctly_decoded(self):
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self.message.attach(
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"Une pièce jointe.html", "<p>\u2019</p>", mimetype="text/html"
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)
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self.message.send()
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data = self.get_api_call_json()
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self.assertEqual(
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data["attachments"],
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[
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{
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"filename": "Une pièce jointe.html",
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"content": b64encode("<p>\u2019</p>".encode("utf-8")).decode(
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"ascii"
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),
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}
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],
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)
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def test_embedded_images(self):
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# Resend's API doesn't have a way to specify content-id
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image_filename = SAMPLE_IMAGE_FILENAME
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image_path = sample_image_path(image_filename)
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cid = attach_inline_image_file(self.message, image_path) # Read from a png file
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html_content = (
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'<p>This has an <img src="cid:%s" alt="inline" /> image.</p>' % cid
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)
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self.message.attach_alternative(html_content, "text/html")
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with self.assertRaisesMessage(AnymailUnsupportedFeature, "inline content-id"):
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self.message.send()
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def test_attached_images(self):
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image_filename = SAMPLE_IMAGE_FILENAME
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image_path = sample_image_path(image_filename)
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image_data = sample_image_content(image_filename)
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# option 1: attach as a file
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self.message.attach_file(image_path)
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# option 2: construct the MIMEImage and attach it directly
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image = MIMEImage(image_data)
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self.message.attach(image)
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image_data_b64 = b64encode(image_data).decode("ascii")
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self.message.send()
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data = self.get_api_call_json()
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self.assertEqual(
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data["attachments"],
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[
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{
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"filename": image_filename, # the named one
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"content": image_data_b64,
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},
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{
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# For unnamed attachments, Anymail constructs a default name
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# based on the content_type:
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"filename": "attachment.png",
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"content": image_data_b64,
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},
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],
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)
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def test_multiple_html_alternatives(self):
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# Multiple alternatives not allowed
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self.message.attach_alternative("<p>First html is OK</p>", "text/html")
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self.message.attach_alternative("<p>But not second html</p>", "text/html")
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with self.assertRaisesMessage(AnymailUnsupportedFeature, "multiple html parts"):
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self.message.send()
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def test_html_alternative(self):
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# Only html alternatives allowed
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self.message.attach_alternative("{'not': 'allowed'}", "application/json")
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with self.assertRaises(AnymailUnsupportedFeature):
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self.message.send()
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def test_alternatives_fail_silently(self):
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# Make sure fail_silently is respected
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self.message.attach_alternative("{'not': 'allowed'}", "application/json")
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sent = self.message.send(fail_silently=True)
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self.assert_esp_not_called("API should not be called when send fails silently")
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self.assertEqual(sent, 0)
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def test_suppress_empty_address_lists(self):
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"""Empty to, cc, bcc, and reply_to shouldn't generate empty fields"""
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self.message.send()
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data = self.get_api_call_json()
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self.assertNotIn("cc", data)
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self.assertNotIn("bcc", data)
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self.assertNotIn("reply_to", data)
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# Test empty `to`--but send requires at least one recipient somewhere (like cc)
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self.message.to = []
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self.message.cc = ["cc@example.com"]
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self.message.send()
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data = self.get_api_call_json()
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self.assertNotIn("to", data)
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def test_api_failure(self):
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failure_response = {
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"statusCode": 400,
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"message": "API key is invalid",
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"name": "validation_error",
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}
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self.set_mock_response(status_code=400, json_data=failure_response)
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with self.assertRaisesMessage(
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AnymailAPIError, r"Resend API response 400"
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) as cm:
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mail.send_mail("Subject", "Body", "from@example.com", ["to@example.com"])
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self.assertIn("API key is invalid", str(cm.exception))
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|
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# Make sure fail_silently is respected
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self.set_mock_response(status_code=422, json_data=failure_response)
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sent = mail.send_mail(
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"Subject",
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"Body",
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"from@example.com",
|
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["to@example.com"],
|
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fail_silently=True,
|
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)
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self.assertEqual(sent, 0)
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|
||||
|
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@tag("resend")
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class ResendBackendAnymailFeatureTests(ResendBackendMockAPITestCase):
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"""Test backend support for Anymail added features"""
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|
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def test_envelope_sender(self):
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self.message.envelope_sender = "anything@bounces.example.com"
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with self.assertRaisesMessage(AnymailUnsupportedFeature, "envelope_sender"):
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self.message.send()
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def test_metadata(self):
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self.message.metadata = {"user_id": "12345", "items": 6}
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self.message.send()
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data = self.get_api_call_json()
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self.assertEqual(
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json.loads(data["headers"]["X-Metadata"]),
|
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{"user_id": "12345", "items": 6},
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||||
)
|
||||
|
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def test_send_at(self):
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self.message.send_at = 1651820889 # 2022-05-06 07:08:09 UTC
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with self.assertRaisesMessage(AnymailUnsupportedFeature, "send_at"):
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self.message.send()
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||||
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def test_tags(self):
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self.message.tags = ["receipt", "reorder test 12"]
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||||
self.message.send()
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data = self.get_api_call_json()
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self.assertEqual(
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json.loads(data["headers"]["X-Tags"]),
|
||||
["receipt", "reorder test 12"],
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||||
)
|
||||
|
||||
def test_headers_metadata_tags_interaction(self):
|
||||
# Test three features that use custom headers don't clobber each other
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||||
self.message.extra_headers = {"X-Custom": "custom value"}
|
||||
self.message.metadata = {"user_id": "12345"}
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||||
self.message.tags = ["receipt", "reorder test 12"]
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self.message.send()
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||||
data = self.get_api_call_json()
|
||||
self.assertEqual(
|
||||
data["headers"],
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||||
{
|
||||
"X-Custom": "custom value",
|
||||
"X-Tags": '["receipt", "reorder test 12"]',
|
||||
"X-Metadata": '{"user_id": "12345"}',
|
||||
},
|
||||
)
|
||||
|
||||
def test_track_opens(self):
|
||||
self.message.track_opens = True
|
||||
with self.assertRaisesMessage(AnymailUnsupportedFeature, "track_opens"):
|
||||
self.message.send()
|
||||
|
||||
def test_track_clicks(self):
|
||||
self.message.track_clicks = True
|
||||
with self.assertRaisesMessage(AnymailUnsupportedFeature, "track_clicks"):
|
||||
self.message.send()
|
||||
|
||||
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()
|
||||
data = self.get_api_call_json()
|
||||
self.assertNotIn("headers", data)
|
||||
self.assertNotIn("attachments", data)
|
||||
self.assertNotIn("tags", data)
|
||||
|
||||
def test_esp_extra(self):
|
||||
self.message.esp_extra = {
|
||||
"tags": [{"name": "my_tag", "value": "my_tag_value"}],
|
||||
}
|
||||
self.message.send()
|
||||
data = self.get_api_call_json()
|
||||
self.assertEqual(data["tags"], [{"name": "my_tag", "value": "my_tag_value"}])
|
||||
|
||||
# noinspection PyUnresolvedReferences
|
||||
def test_send_attaches_anymail_status(self):
|
||||
"""The anymail_status should be attached to the message when it is sent"""
|
||||
msg = mail.EmailMessage(
|
||||
"Subject",
|
||||
"Message",
|
||||
"from@example.com",
|
||||
["Recipient <to1@example.com>"],
|
||||
)
|
||||
sent = msg.send()
|
||||
self.assertEqual(sent, 1)
|
||||
self.assertEqual(msg.anymail_status.status, {"queued"})
|
||||
self.assertEqual(
|
||||
msg.anymail_status.message_id, "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"
|
||||
)
|
||||
self.assertEqual(
|
||||
msg.anymail_status.recipients["to1@example.com"].status, "queued"
|
||||
)
|
||||
self.assertEqual(
|
||||
msg.anymail_status.recipients["to1@example.com"].message_id,
|
||||
"aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
|
||||
)
|
||||
self.assertEqual(
|
||||
msg.anymail_status.esp_response.content, self.DEFAULT_RAW_RESPONSE
|
||||
)
|
||||
|
||||
# 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 = {"price": Decimal("19.99")} # yeah, don't do this
|
||||
with self.assertRaises(AnymailSerializationError) as cm:
|
||||
self.message.send()
|
||||
print(self.get_api_call_json())
|
||||
err = cm.exception
|
||||
self.assertIsInstance(err, TypeError) # compatibility with json.dumps
|
||||
# our added context:
|
||||
self.assertIn("Don't know how to send this data to Resend", str(err))
|
||||
# original message:
|
||||
self.assertRegex(str(err), r"Decimal.*is not JSON serializable")
|
||||
|
||||
|
||||
@tag("resend")
|
||||
class ResendBackendRecipientsRefusedTests(ResendBackendMockAPITestCase):
|
||||
# Resend 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.
|
||||
pass
|
||||
|
||||
|
||||
@tag("resend")
|
||||
class ResendBackendSessionSharingTestCase(
|
||||
SessionSharingTestCases, ResendBackendMockAPITestCase
|
||||
):
|
||||
"""Requests session sharing tests"""
|
||||
|
||||
pass # tests are defined in SessionSharingTestCases
|
||||
|
||||
|
||||
@tag("resend")
|
||||
@override_settings(EMAIL_BACKEND="anymail.backends.resend.EmailBackend")
|
||||
class ResendBackendImproperlyConfiguredTests(AnymailTestMixin, SimpleTestCase):
|
||||
"""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)
|
||||
self.assertRegex(errmsg, r"\bRESEND_API_KEY\b")
|
||||
self.assertRegex(errmsg, r"\bANYMAIL_RESEND_API_KEY\b")
|
||||
Reference in New Issue
Block a user