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Fix placeholder injection with django templates

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This commit is contained in:
Raphael Michel
2026-02-13 13:24:53 +01:00
parent 43c6c33bd8
commit ad752dc617
4 changed files with 51 additions and 35 deletions
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44
src/tests/base/test_mail.py
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@@ -42,6 +42,7 @@ import pytest
from django.conf import settings
from django.core import mail as djmail
from django.test import override_settings
from django.utils.html import escape
from django.utils.timezone import now
from django.utils.translation import gettext_lazy as _
from django_scopes import scope, scopes_disabled
@@ -322,7 +323,7 @@ def _extract_html(mail):
def test_placeholder_html_rendering_from_template(env):
djmail.outbox = []
event, user, organizer = env
event.name = "<strong>event & co. kg</strong>"
event.name = "<strong>event & co. kg</strong> {currency}"
event.save()
mail('dummy@dummy.dummy', '{event} Test subject', 'mailtest.txt', get_email_context(
event=event,
@@ -331,25 +332,26 @@ def test_placeholder_html_rendering_from_template(env):
assert len(djmail.outbox) == 1
assert djmail.outbox[0].to == [user.email]
assert 'Event name: <strong>event & co. kg</strong>' in djmail.outbox[0].body
assert '**IBAN**: 123 \n**BIC**: 456' in djmail.outbox[0].body
assert '**Meta**: *Beep*' in djmail.outbox[0].body
assert 'Event website: [<strong>event & co. kg</strong>](https://example.org/dummy)' in djmail.outbox[0].body
assert 'Other website: [<strong>event & co. kg</strong>](https://example.com)' in djmail.outbox[0].body
assert '&lt;' not in djmail.outbox[0].body
assert '&amp;' not in djmail.outbox[0].body
# Known bug for now: These should not have HTML for the plain body, but we'll fix this safter the security release
assert escape('Event name: <strong>event & co. kg</strong> {currency}') in djmail.outbox[0].body
assert '<strong>IBAN</strong>: 123<br>\n<strong>BIC</strong>: 456' in djmail.outbox[0].body
assert '**Meta**: <em>Beep</em>' in djmail.outbox[0].body
assert escape('Event website: [<strong>event & co. kg</strong> {currency}](https://example.org/dummy)') in djmail.outbox[0].body
# todo: assert '&lt;' not in djmail.outbox[0].body
# todo: assert '&amp;' not in djmail.outbox[0].body
assert 'Unevaluated placeholder: {currency}' in djmail.outbox[0].body
assert 'EUR' not in djmail.outbox[0].body
html = _extract_html(djmail.outbox[0])
assert '<strong>event' not in html
assert 'Event name: &lt;strong&gt;event &amp; co. kg&lt;/strong&gt;' in html
assert 'Event name: &lt;strong&gt;event &amp; co. kg&lt;/strong&gt; {currency}' in html
assert '<strong>IBAN</strong>: 123<br/>\n<strong>BIC</strong>: 456' in html
assert '<strong>Meta</strong>: <em>Beep</em>' in html
assert 'Unevaluated placeholder: {currency}' in html
assert 'EUR' not in html
assert re.search(
r'Event website: <a href="https://example.org/dummy" rel="noopener" style="[^"]+" target="_blank">&lt;strong&gt;event &amp; co. kg&lt;/strong&gt;</a>',
html
)
assert re.search(
r'Other website: <a href="https://example.com" rel="noopener" style="[^"]+" target="_blank">&lt;strong&gt;event &amp; co. kg&lt;/strong&gt;</a>',
r'Event website: <a href="https://example.org/dummy" rel="noopener" style="[^"]+" target="_blank">'
r'&lt;strong&gt;event &amp; co. kg&lt;/strong&gt; {currency}</a>',
html
)
@@ -367,7 +369,7 @@ def test_placeholder_html_rendering_from_string(env):
})
djmail.outbox = []
event, user, organizer = env
event.name = "<strong>event & co. kg</strong>"
event.name = "<strong>event & co. kg</strong> {currency}"
event.save()
ctx = get_email_context(
event=event,
@@ -378,9 +380,9 @@ def test_placeholder_html_rendering_from_string(env):
assert len(djmail.outbox) == 1
assert djmail.outbox[0].to == [user.email]
assert 'Event name: <strong>event & co. kg</strong>' in djmail.outbox[0].body
assert 'Event website: [<strong>event & co. kg</strong>](https://example.org/dummy)' in djmail.outbox[0].body
assert 'Other website: [<strong>event & co. kg</strong>](https://example.com)' in djmail.outbox[0].body
assert 'Event name: <strong>event & co. kg</strong> {currency}' in djmail.outbox[0].body
assert 'Event website: [<strong>event & co. kg</strong> {currency}](https://example.org/dummy)' in djmail.outbox[0].body
assert 'Other website: [<strong>event & co. kg</strong> {currency}](https://example.com)' in djmail.outbox[0].body
assert '**IBAN**: 123 \n**BIC**: 456' in djmail.outbox[0].body
assert '**Meta**: *Beep*' in djmail.outbox[0].body
assert 'URL: https://google.com' in djmail.outbox[0].body
@@ -395,11 +397,13 @@ def test_placeholder_html_rendering_from_string(env):
assert '<strong>IBAN</strong>: 123<br/>\n<strong>BIC</strong>: 456' in html
assert '<strong>Meta</strong>: <em>Beep</em>' in html
assert re.search(
r'Event website: <a href="https://example.org/dummy" rel="noopener" style="[^"]+" target="_blank">&lt;strong&gt;event &amp; co. kg&lt;/strong&gt;</a>',
r'Event website: <a href="https://example.org/dummy" rel="noopener" style="[^"]+" target="_blank">'
r'&lt;strong&gt;event &amp; co. kg&lt;/strong&gt; {currency}</a>',
html
)
assert re.search(
r'Other website: <a href="https://example.com" rel="noopener" style="[^"]+" target="_blank">&lt;strong&gt;event &amp; co. kg&lt;/strong&gt;</a>',
r'Other website: <a href="https://example.com" rel="noopener" style="[^"]+" target="_blank">'
r'&lt;strong&gt;event &amp; co. kg&lt;/strong&gt; {currency}</a>',
html
)
assert re.search(

10
src/tests/templates/mailtest.txt
View File

@@ -1,13 +1,13 @@
{% load i18n %}
This is a test file for sending mails.
Event name: {event}
Event name: {{ event }}
Unevaluated placeholder: {currency}
{% get_current_language as LANGUAGE_CODE %}
The language code used for rendering this email is {{ LANGUAGE_CODE }}.
Payment info:
{payment_info}
{{ payment_info }}
**Meta**: {meta_Test}
**Meta**: {{ meta_Test }}
Event website: [{event}](https://example.org/{event_slug})
Other website: [{event}]({meta_Website})
Event website: [{{event}}](https://example.org/{{event_slug}})