87 lines
2.4 KiB
Python
87 lines
2.4 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 django.utils.functional import Promise, wraps
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class SafeData:
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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 SafeBytes(bytes, SafeData):
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"""
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A bytes subclass that has been specifically marked as "safe" (requires no
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further escaping) for HTML output purposes.
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Kept in Django 2.0 for usage by apps supporting Python 2. Shouldn't be used
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in Django anymore.
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"""
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def __add__(self, rhs):
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"""
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Concatenating a safe byte string with another safe byte string or safe
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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, SafeText):
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return SafeText(t)
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elif isinstance(rhs, SafeBytes):
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return SafeBytes(t)
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return t
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class SafeText(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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def __add__(self, rhs):
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"""
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Concatenating a safe string with another safe byte string 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 SafeText(t)
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return t
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def __str__(self):
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return self
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SafeString = SafeText
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def _safety_decorator(safety_marker, func):
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@wraps(func)
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def wrapped(*args, **kwargs):
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return safety_marker(func(*args, **kwargs))
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return wrapped
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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 isinstance(s, (str, Promise)):
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return SafeText(s)
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if callable(s):
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return _safety_decorator(mark_safe, s)
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return SafeText(str(s))
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