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""" Functions for working with "safe strings": strings that can be displayed safely without further escaping in HTML. Marking something as a "safe string" means that the producer of the string has already turned characters that should not be interpreted by the HTML engine (e.g. '<') into the appropriate entities. """ from django.utils.functional import wraps class SafeData: def __html__(self): """ Return the html representation of a string for interoperability. This allows other template engines to understand Django's SafeData. """ return self class SafeBytes(bytes, SafeData): """ A bytes subclass that has been specifically marked as "safe" (requires no further escaping) for HTML output purposes. Kept in Django 2.0 for usage by apps supporting Python 2. Shouldn't be used in Django anymore. """ def __add__(self, rhs): """ Concatenating a safe byte string with another safe byte string or safe string is safe. Otherwise, the result is no longer safe. """ t = super().__add__(rhs) if isinstance(rhs, SafeText): return SafeText(t) elif isinstance(rhs, SafeBytes): return SafeBytes(t) return t class SafeText(str, SafeData): """ A str subclass that has been specifically marked as "safe" for HTML output purposes. """ def __add__(self, rhs): """ Concatenating a safe string with another safe bytestring or safe string is safe. Otherwise, the result is no longer safe. """ t = super().__add__(rhs) if isinstance(rhs, SafeData): return SafeText(t) return t def __str__(self): return self SafeString = SafeText def _safety_decorator(safety_marker, func): @wraps(func) def wrapped(*args, **kwargs): return safety_marker(func(*args, **kwargs)) return wrapped def mark_safe(s): """ Explicitly mark a string as safe for (HTML) output purposes. The returned object can be used everywhere a string is appropriate. If used on a method as a decorator, mark the returned data as safe. Can be called multiple times on a single string. """ if hasattr(s, '__html__'): return s if callable(s): return _safety_decorator(mark_safe, s) return SafeText(s)