94 lines
3.2 KiB
Python
94 lines
3.2 KiB
Python
from __future__ import annotations
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from .mixins import UpdateDictMixin
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def csp_property(key):
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"""Return a new property object for a content security policy header.
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Useful if you want to add support for a csp extension in a
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subclass.
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"""
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return property(
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lambda x: x._get_value(key),
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lambda x, v: x._set_value(key, v),
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lambda x: x._del_value(key),
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f"accessor for {key!r}",
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)
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class ContentSecurityPolicy(UpdateDictMixin, dict):
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"""Subclass of a dict that stores values for a Content Security Policy
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header. It has accessors for all the level 3 policies.
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Because the csp directives in the HTTP header use dashes the
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python descriptors use underscores for that.
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To get a header of the :class:`ContentSecuirtyPolicy` object again
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you can convert the object into a string or call the
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:meth:`to_header` method. If you plan to subclass it and add your
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own items have a look at the sourcecode for that class.
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.. versionadded:: 1.0.0
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Support for Content Security Policy headers was added.
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"""
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base_uri = csp_property("base-uri")
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child_src = csp_property("child-src")
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connect_src = csp_property("connect-src")
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default_src = csp_property("default-src")
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font_src = csp_property("font-src")
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form_action = csp_property("form-action")
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frame_ancestors = csp_property("frame-ancestors")
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frame_src = csp_property("frame-src")
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img_src = csp_property("img-src")
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manifest_src = csp_property("manifest-src")
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media_src = csp_property("media-src")
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navigate_to = csp_property("navigate-to")
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object_src = csp_property("object-src")
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prefetch_src = csp_property("prefetch-src")
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plugin_types = csp_property("plugin-types")
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report_to = csp_property("report-to")
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report_uri = csp_property("report-uri")
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sandbox = csp_property("sandbox")
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script_src = csp_property("script-src")
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script_src_attr = csp_property("script-src-attr")
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script_src_elem = csp_property("script-src-elem")
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style_src = csp_property("style-src")
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style_src_attr = csp_property("style-src-attr")
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style_src_elem = csp_property("style-src-elem")
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worker_src = csp_property("worker-src")
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def __init__(self, values=(), on_update=None):
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dict.__init__(self, values or ())
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self.on_update = on_update
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self.provided = values is not None
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def _get_value(self, key):
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"""Used internally by the accessor properties."""
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return self.get(key)
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def _set_value(self, key, value):
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"""Used internally by the accessor properties."""
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if value is None:
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self.pop(key, None)
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else:
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self[key] = value
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def _del_value(self, key):
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"""Used internally by the accessor properties."""
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if key in self:
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del self[key]
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def to_header(self):
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"""Convert the stored values into a cache control header."""
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from ..http import dump_csp_header
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return dump_csp_header(self)
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def __str__(self):
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return self.to_header()
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def __repr__(self):
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kv_str = " ".join(f"{k}={v!r}" for k, v in sorted(self.items()))
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return f"<{type(self).__name__} {kv_str}>"
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