73 lines
1.8 KiB
Python
73 lines
1.8 KiB
Python
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"""
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Functions for working with "safe strings": strings that can be displayed safely
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without further escaping in HTML. Marking something as a "safe string" means
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that the producer of the string has already turned characters that should not
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be interpreted by the HTML engine (e.g. '<') into the appropriate entities.
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"""
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from functools import wraps
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from django.utils.functional import keep_lazy
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class SafeData:
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__slots__ = ()
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def __html__(self):
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"""
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Return the html representation of a string for interoperability.
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This allows other template engines to understand Django's SafeData.
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"""
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return self
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class SafeString(str, SafeData):
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"""
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A str subclass that has been specifically marked as "safe" for HTML output
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purposes.
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"""
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__slots__ = ()
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def __add__(self, rhs):
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"""
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Concatenating a safe string with another safe bytestring or
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safe string is safe. Otherwise, the result is no longer safe.
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"""
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t = super().__add__(rhs)
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if isinstance(rhs, SafeData):
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return SafeString(t)
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return t
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def __str__(self):
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return self
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SafeText = SafeString # For backwards compatibility since Django 2.0.
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def _safety_decorator(safety_marker, func):
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@wraps(func)
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def wrapper(*args, **kwargs):
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return safety_marker(func(*args, **kwargs))
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return wrapper
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@keep_lazy(SafeString)
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def mark_safe(s):
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"""
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Explicitly mark a string as safe for (HTML) output purposes. The returned
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object can be used everywhere a string is appropriate.
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If used on a method as a decorator, mark the returned data as safe.
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Can be called multiple times on a single string.
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"""
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if hasattr(s, "__html__"):
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return s
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if callable(s):
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return _safety_decorator(mark_safe, s)
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return SafeString(s)
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