mirror of
https://github.com/dgtlmoon/changedetection.io.git
synced 2025-11-04 00:27:48 +00:00
56 lines
1.8 KiB
Python
56 lines
1.8 KiB
Python
"""
|
|
Safe Jinja2 render with max payload sizes
|
|
|
|
See https://jinja.palletsprojects.com/en/3.1.x/sandbox/#security-considerations
|
|
"""
|
|
|
|
import jinja2.sandbox
|
|
import typing as t
|
|
import os
|
|
from .extensions.TimeExtension import TimeExtension
|
|
|
|
JINJA2_MAX_RETURN_PAYLOAD_SIZE = 1024 * int(os.getenv("JINJA2_MAX_RETURN_PAYLOAD_SIZE_KB", 1024 * 10))
|
|
|
|
# Default extensions - can be overridden in create_jinja_env()
|
|
DEFAULT_JINJA2_EXTENSIONS = [TimeExtension]
|
|
|
|
|
|
def create_jinja_env(extensions=None, **kwargs) -> jinja2.sandbox.ImmutableSandboxedEnvironment:
|
|
"""
|
|
Create a sandboxed Jinja2 environment with our custom extensions and default timezone.
|
|
|
|
Args:
|
|
extensions: List of extension classes to use (defaults to DEFAULT_JINJA2_EXTENSIONS)
|
|
**kwargs: Additional arguments to pass to ImmutableSandboxedEnvironment
|
|
|
|
Returns:
|
|
Configured Jinja2 environment
|
|
"""
|
|
if extensions is None:
|
|
extensions = DEFAULT_JINJA2_EXTENSIONS
|
|
|
|
jinja2_env = jinja2.sandbox.ImmutableSandboxedEnvironment(
|
|
extensions=extensions,
|
|
**kwargs
|
|
)
|
|
|
|
# Get default timezone from environment variable
|
|
default_timezone = os.getenv('TZ', 'UTC').strip()
|
|
jinja2_env.default_timezone = default_timezone
|
|
|
|
return jinja2_env
|
|
|
|
|
|
# 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.
|
|
# (Which also limits available functions that could be called)
|
|
def render(template_str, **args: t.Any) -> str:
|
|
jinja2_env = create_jinja_env()
|
|
output = jinja2_env.from_string(template_str).render(args)
|
|
return output[:JINJA2_MAX_RETURN_PAYLOAD_SIZE]
|
|
|
|
def render_fully_escaped(content):
|
|
env = jinja2.sandbox.ImmutableSandboxedEnvironment(autoescape=True)
|
|
template = env.from_string("{{ some_html|e }}")
|
|
return template.render(some_html=content)
|
|
|