#31203: Using Markup in ValidationError
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Reporter: Felipe | Owner: (none)
Type: Bug | Status: new
Component: Error reporting | Version: master
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Not 100% positive this is a bug, but definitely a breaking change in
Django.
In 1.11 ValidationError used force_text to stringify its messages, but in
2.2 and 3.0, it's using str.
force_text used to check for subtypes of six.text_type and let those
through unchanged, whereas str forces the __str__ conversion.
This interacts poorly with Markup, which 'unwraps' itself in the __str__
method. Here's a sample problem:
{{{
type(next(iter(ValidationError(
message=Markup('%(x)s had a problem'),
params={'x': Markup('<span>X</span>')}
)))) is str
}}}
That error should render on a form as a span followed by some text;
however, the use of str causes the 'safeness' of the markup to be lost and
thus it's re-escaped and the HTML leaks into the page.
Maybe Markup should be returning self in __str__, since it's a __str__
subclass. This bug can be worked around from client code using something
like this:
{{{
class StubbornMarkup(Markup):
def __str__(self):
return self
type(next(iter(ValidationError(
message=StubbornMarkup('%(x)s had a problem'),
params={'x': Markup('<span>X</span>')}
)))) is StubbornMarkup
}}}
This is vaguely related to #13723, which seems to suggest the use of
Markup should be supported.
--
Ticket URL: <https://code.djangoproject.com/ticket/31203>
Django <https://code.djangoproject.com/>
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