mirror of
https://github.com/dgtlmoon/changedetection.io.git
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59 lines
2.0 KiB
Python
59 lines
2.0 KiB
Python
"""
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Safe Jinja2 render with max payload sizes
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See https://jinja.palletsprojects.com/en/3.1.x/sandbox/#security-considerations
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"""
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import jinja2.sandbox
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import typing as t
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import os
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from .extensions.TimeExtension import TimeExtension
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from .plugins import regex_replace
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JINJA2_MAX_RETURN_PAYLOAD_SIZE = 1024 * int(os.getenv("JINJA2_MAX_RETURN_PAYLOAD_SIZE_KB", 1024 * 10))
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# Default extensions - can be overridden in create_jinja_env()
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DEFAULT_JINJA2_EXTENSIONS = [TimeExtension]
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def create_jinja_env(extensions=None, **kwargs) -> jinja2.sandbox.ImmutableSandboxedEnvironment:
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"""
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Create a sandboxed Jinja2 environment with our custom extensions and default timezone.
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Args:
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extensions: List of extension classes to use (defaults to DEFAULT_JINJA2_EXTENSIONS)
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**kwargs: Additional arguments to pass to ImmutableSandboxedEnvironment
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Returns:
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Configured Jinja2 environment
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"""
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if extensions is None:
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extensions = DEFAULT_JINJA2_EXTENSIONS
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jinja2_env = jinja2.sandbox.ImmutableSandboxedEnvironment(
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extensions=extensions,
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**kwargs
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)
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# Get default timezone from environment variable
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default_timezone = os.getenv('TZ', 'UTC').strip()
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jinja2_env.default_timezone = default_timezone
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# Register custom filters
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jinja2_env.filters['regex_replace'] = regex_replace
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return jinja2_env
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# This is used for notifications etc, so actually it's OK to send custom HTML such as <a href> etc, but it should limit what data is available.
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# (Which also limits available functions that could be called)
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def render(template_str, **args: t.Any) -> str:
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jinja2_env = create_jinja_env()
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output = jinja2_env.from_string(template_str).render(args)
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return output[:JINJA2_MAX_RETURN_PAYLOAD_SIZE]
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def render_fully_escaped(content):
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env = jinja2.sandbox.ImmutableSandboxedEnvironment(autoescape=True)
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template = env.from_string("{{ some_html|e }}")
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return template.render(some_html=content)
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