563 lines
22 KiB
Python
563 lines
22 KiB
Python
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# Copyright (c) 2016-2024 Martin Donath <martin.donath@squidfunk.com>
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to
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# deal in the Software without restriction, including without limitation the
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# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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# sell copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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from __future__ import annotations
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import errno
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import logging
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import os
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import posixpath
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import re
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import requests
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import sys
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from colorama import Fore, Style
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from concurrent.futures import Future, ThreadPoolExecutor, wait
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from hashlib import sha1
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from mkdocs.config.config_options import ExtraScriptValue
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from mkdocs.config.defaults import MkDocsConfig
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from mkdocs.exceptions import PluginError
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from mkdocs.plugins import BasePlugin, event_priority
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from mkdocs.structure.files import File, Files
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from mkdocs.utils import is_error_template
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from re import Match
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from urllib.parse import ParseResult as URL, urlparse, unquote
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from xml.etree.ElementTree import Element, tostring
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from .config import PrivacyConfig
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from .parser import FragmentParser
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# -----------------------------------------------------------------------------
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# Classes
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# -----------------------------------------------------------------------------
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# Privacy plugin
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class PrivacyPlugin(BasePlugin[PrivacyConfig]):
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# Initialize thread pools and asset collections
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def on_config(self, config):
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self.site = urlparse(config.site_url or "")
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if not self.config.enabled:
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return
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# Initialize thread pool
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self.pool = ThreadPoolExecutor(self.config.concurrency)
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self.pool_jobs: list[Future] = []
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# Initialize collections of external assets
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self.assets = Files([])
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self.assets_expr_map = {
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".css": r"url\((\s*http?[^)]+)\)",
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".js": r"[\"'](http[^\"']+\.(?:css|js(?:on)?))[\"']",
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**self.config.assets_expr_map
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}
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# Process external style sheets and scripts (run latest) - run this after
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# all other plugins, so they can add additional assets
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@event_priority(-100)
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def on_files(self, files, *, config):
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if not self.config.enabled:
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return
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# Skip if external assets must not be processed
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if not self.config.assets:
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return
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# Find all external style sheet and script files that are provided as
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# part of the build (= already known to MkDocs on startup)
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for initiator in files.media_files():
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file = None
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# Check if the file has dependent external assets that must be
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# downloaded. Create and enqueue a job for each external asset.
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for url in self._parse_media(initiator):
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if not self._is_excluded(url, initiator):
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file = self._queue(url, config, concurrent = True)
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# If site URL is not given, ensure that Mermaid.js is always
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# present. This is a special case, as Material for MkDocs
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# automatically loads Mermaid.js when a Mermaid diagram is
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# found in the page - https://bit.ly/36tZXsA.
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if "mermaid.min.js" in url.path and not config.site_url:
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path = url.geturl()
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if path not in config.extra_javascript:
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config.extra_javascript.append(
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ExtraScriptValue(path)
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)
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# The local asset references at least one external asset, which
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# means we must download and replace them later
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if file:
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self.assets.append(initiator)
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files.remove(initiator)
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# Process external style sheet files
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for path in config.extra_css:
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url = urlparse(path)
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if not self._is_excluded(url):
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self._queue(url, config, concurrent = True)
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# Process external script files
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for script in config.extra_javascript:
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if isinstance(script, str):
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script = ExtraScriptValue(script)
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# Enqueue a job if the script needs to downloaded
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url = urlparse(script.path)
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if not self._is_excluded(url):
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self._queue(url, config, concurrent = True)
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# Process external images in page (run latest) - this stage is the earliest
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# we can start processing external images, since images are the most common
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# type of external asset when writing. Thus, we create and enqueue a job for
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# each image we find that checks if the image needs to be downloaded.
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@event_priority(-100)
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def on_page_content(self, html, *, page, config, files):
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if not self.config.enabled:
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return
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# Skip if external assets must not be processed
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if not self.config.assets:
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return
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# Find all external images and download them if not excluded
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for match in re.findall(
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r"<img[^>]+src=['\"]?http[^>]+>",
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html, flags = re.I | re.M
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):
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el = self._parse_fragment(match)
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# Create and enqueue job to fetch external image
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url = urlparse(el.get("src"))
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if not self._is_excluded(url, page.file):
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self._queue(url, config, concurrent = True)
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# Process external assets in template (run later)
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@event_priority(-50)
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def on_post_template(self, output_content, *, template_name, config):
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if not self.config.enabled:
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return
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# Skip sitemap.xml and other non-HTML files
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if not template_name.endswith(".html"):
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return
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# Parse and replace links to external assets in template
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initiator = File(template_name, config.docs_dir, config.site_dir, False)
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return self._parse_html(output_content, initiator, config)
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# Process external assets in page (run later)
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@event_priority(-50)
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def on_post_page(self, output, *, page, config):
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if not self.config.enabled:
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return
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# Parse and replace links to external assets
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return self._parse_html(output, page.file, config)
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# Reconcile jobs (run earlier)
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@event_priority(50)
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def on_post_build(self, *, config):
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if not self.config.enabled:
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return
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# Reconcile concurrent jobs and clear thread pool, as we will reuse the
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# same thread pool for patching all links to external assets
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wait(self.pool_jobs)
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self.pool_jobs.clear()
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# Spawn concurrent job to patch all links to dependent external asset
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# in all style sheet and script files
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for file in self.assets:
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_, extension = posixpath.splitext(file.dest_uri)
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if extension in [".css", ".js"]:
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self.pool_jobs.append(self.pool.submit(
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self._patch, file
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))
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# Otherwise just copy external asset to output directory
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else:
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file.copy_file()
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# Reconcile concurrent jobs for the last time, so the plugins following
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# in the build process always have a consistent state to work with
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wait(self.pool_jobs)
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self.pool.shutdown()
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# -------------------------------------------------------------------------
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# Check if the given URL is external
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def _is_external(self, url: URL):
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hostname = url.hostname or self.site.hostname
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return hostname != self.site.hostname
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# Check if the given URL is excluded
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def _is_excluded(self, url: URL, initiator: File | None = None):
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if not self._is_external(url):
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return True
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# Skip if external assets must not be processed
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if not self.config.assets:
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return True
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# If initiator is given, format for printing
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via = ""
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if initiator:
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via = "".join([
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Fore.WHITE, Style.DIM,
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f"in '{initiator.src_uri}' ",
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Style.RESET_ALL
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])
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# Print warning if fetching is not enabled
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if not self.config.assets_fetch:
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log.warning(f"External file: {url.geturl()} {via}")
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return True
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# File is not excluded
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return False
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# -------------------------------------------------------------------------
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# Parse a fragment
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def _parse_fragment(self, fragment: str):
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parser = FragmentParser()
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parser.feed(fragment)
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parser.close()
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# Check parse result and return element
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if isinstance(parser.result, Element):
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return parser.result
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# Otherwise, raise a plugin error - if the author accidentally used
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# invalid HTML inside of the tag, e.g., forget a opening or closing
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# quote, we need to catch this here, as we're using pretty basic
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# regular expression based extraction
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raise PluginError(
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f"Could not parse due to possible syntax error in HTML: \n\n"
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+ fragment
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)
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# Parse and extract all external assets from a media file using a preset
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# regular expression, and return all URLs found.
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def _parse_media(self, initiator: File) -> list[URL]:
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_, extension = posixpath.splitext(initiator.dest_uri)
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if extension not in self.assets_expr_map:
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return []
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# Find and extract all external asset URLs
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expr = re.compile(self.assets_expr_map[extension], flags = re.I | re.M)
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with open(initiator.abs_src_path, encoding = "utf-8-sig") as f:
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return [urlparse(url) for url in re.findall(expr, f.read())]
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# Parse template or page HTML and find all external links that need to be
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# replaced. Many of the assets should already be downloaded earlier, i.e.,
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# everything that was directly referenced in the document, but there may
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# still exist external assets that were added by third-party plugins.
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def _parse_html(self, output: str, initiator: File, config: MkDocsConfig):
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# Resolve callback
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def resolve(file: File):
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if is_error_template(initiator.src_uri):
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base = urlparse(config.site_url or "/")
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return posixpath.join(base.path, file.url)
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else:
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return file.url_relative_to(initiator)
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# Replace callback
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def replace(match: Match):
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el = self._parse_fragment(match.group())
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# Handle external style sheet or preconnect hint
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if el.tag == "link":
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url = urlparse(el.get("href"))
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if not self._is_excluded(url, initiator):
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rel = el.get("rel", "")
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# Replace external preconnect hint
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if rel == "preconnect":
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return ""
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# Replace external style sheet or favicon
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if rel == "stylesheet" or rel == "icon":
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file = self._queue(url, config)
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el.set("href", resolve(file))
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# Handle external script or image
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if el.tag == "script" or el.tag == "img":
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url = urlparse(el.get("src"))
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if not self._is_excluded(url, initiator):
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file = self._queue(url, config)
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el.set("src", resolve(file))
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# Return element as string
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return self._print(el)
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# Find and replace all external asset URLs in current page
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return re.sub(
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r"<(?:(?:a|link)[^>]+href|(?:script|img)[^>]+src)=['\"]?http[^>]+>",
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replace, output, flags = re.I | re.M
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)
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# -------------------------------------------------------------------------
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# Print element as string - what could possibly go wrong? We're parsing
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# HTML5 with an XML parser, and XML doesn't allow for boolean attributes,
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# which is why we must add a dummy value to all attributes that are not
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# strings before printing the element as string.
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def _print(self, el: Element):
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temp = "__temp__"
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for name in el.attrib:
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if not isinstance(el.attrib[name], str):
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el.attrib[name] = temp
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# Return void or opening tag as string, strip closing tag
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data = tostring(el, encoding = "unicode")
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return data.replace(" />", ">").replace(f"\"{temp}\"", "")
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# Enqueue external asset for download, if not already done
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def _queue(self, url: URL, config: MkDocsConfig, concurrent = False):
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path = self._path_from_url(url)
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full = posixpath.join(self.config.assets_fetch_dir, path)
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# Try to retrieve existing file
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file = self.assets.get_file_from_path(full)
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if not file:
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# Compute path to external asset, which is sourced from the cache
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# directory, and generate file to register it with MkDocs as soon
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# as it was downloaded. This allows other plugins to apply
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# additional processing.
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file = self._path_to_file(path, config)
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file.url = url.geturl()
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# Spawn concurrent job to fetch external asset if the extension is
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# known and the concurrent flag is set. In that case, this function
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# is called in a context where no replacements are carried out, so
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# the caller must only ensure to reconcile the concurrent jobs.
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_, extension = posixpath.splitext(url.path)
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if extension and concurrent:
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self.pool_jobs.append(self.pool.submit(
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self._fetch, file, config
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))
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# Fetch external asset synchronously, as it either has no extension
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# or is fetched from a context in which replacements are done
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else:
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self._fetch(file, config)
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# Register external asset as file - it might have already been
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# registered, and since MkDocs 1.6, trigger a deprecation warning
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if not self.assets.get_file_from_path(file.src_uri):
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self.assets.append(file)
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# If the URL of the external asset includes a hash fragment, add it to
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# the returned file, e.g. for dark/light images - see https://t.ly/7b16Y
|
||
|
|
if url.fragment:
|
||
|
|
file.url += f"#{url.fragment}"
|
||
|
|
|
||
|
|
# Return file associated with external asset
|
||
|
|
return file
|
||
|
|
|
||
|
|
# Fetch external asset referenced through the given file
|
||
|
|
def _fetch(self, file: File, config: MkDocsConfig):
|
||
|
|
|
||
|
|
# Check if external asset needs to be downloaded
|
||
|
|
if not os.path.isfile(file.abs_src_path) or not self.config.cache:
|
||
|
|
path = file.abs_src_path
|
||
|
|
|
||
|
|
# Download external asset
|
||
|
|
log.info(f"Downloading external file: {file.url}")
|
||
|
|
res = requests.get(file.url, headers = {
|
||
|
|
|
||
|
|
# Set user agent explicitly, so Google Fonts gives us *.woff2
|
||
|
|
# files, which according to caniuse.com is the only format we
|
||
|
|
# need to download as it covers the entire range of browsers
|
||
|
|
# we're officially supporting.
|
||
|
|
"User-Agent": " ".join([
|
||
|
|
"Mozilla/5.0 (Windows NT 10.0; Win64; x64)",
|
||
|
|
"AppleWebKit/537.36 (KHTML, like Gecko)",
|
||
|
|
"Chrome/98.0.4758.102 Safari/537.36"
|
||
|
|
])
|
||
|
|
})
|
||
|
|
|
||
|
|
# Compute expected file extension and append if missing
|
||
|
|
mime = res.headers["content-type"].split(";")[0]
|
||
|
|
extension = extensions.get(mime)
|
||
|
|
if extension and not path.endswith(extension):
|
||
|
|
path += extension
|
||
|
|
|
||
|
|
# Save to file and create symlink if no extension was present
|
||
|
|
self._save_to_file(path, res.content)
|
||
|
|
if path != file.abs_src_path:
|
||
|
|
|
||
|
|
# Creating symlinks might fail on Windows. Thus, we just print
|
||
|
|
# a warning and continue - see https://bit.ly/3xYFzcZ
|
||
|
|
try:
|
||
|
|
os.symlink(os.path.basename(path), file.abs_src_path)
|
||
|
|
except OSError as e:
|
||
|
|
if e.errno != errno.EEXIST:
|
||
|
|
log.warning(
|
||
|
|
f"Couldn't create symbolic link: {file.src_uri}"
|
||
|
|
)
|
||
|
|
|
||
|
|
# Fall back for when the symlink could not be created. This
|
||
|
|
# means that the plugin will download the original file on
|
||
|
|
# every build, as the content type cannot be resolved from
|
||
|
|
# the file extension.
|
||
|
|
file.abs_src_path = path
|
||
|
|
|
||
|
|
# Resolve destination if file points to a symlink
|
||
|
|
_, extension = os.path.splitext(file.abs_src_path)
|
||
|
|
if os.path.isfile(file.abs_src_path):
|
||
|
|
file.abs_src_path = os.path.realpath(file.abs_src_path)
|
||
|
|
_, extension = os.path.splitext(file.abs_src_path)
|
||
|
|
|
||
|
|
# If the symlink could not be created, we already set the correct
|
||
|
|
# extension, so we need to make sure not to append it again
|
||
|
|
if not file.abs_dest_path.endswith(extension):
|
||
|
|
file.src_uri += extension
|
||
|
|
|
||
|
|
# Compute destination file system path
|
||
|
|
file.dest_uri += extension
|
||
|
|
file.abs_dest_path += extension
|
||
|
|
|
||
|
|
# Compute destination URL
|
||
|
|
file.url = file.dest_uri
|
||
|
|
|
||
|
|
# Parse and enqueue dependent external assets
|
||
|
|
for url in self._parse_media(file):
|
||
|
|
if not self._is_excluded(url, file):
|
||
|
|
self._queue(url, config, concurrent = True)
|
||
|
|
|
||
|
|
# Patch all links to external assets in the given file
|
||
|
|
def _patch(self, initiator: File):
|
||
|
|
with open(initiator.abs_src_path, encoding = "utf-8-sig") as f:
|
||
|
|
|
||
|
|
# Replace callback
|
||
|
|
def replace(match: Match):
|
||
|
|
value = match.group(1)
|
||
|
|
|
||
|
|
# Map URL to canonical path
|
||
|
|
path = self._path_from_url(urlparse(value))
|
||
|
|
full = posixpath.join(self.config.assets_fetch_dir, path)
|
||
|
|
|
||
|
|
# Try to retrieve existing file
|
||
|
|
file = self.assets.get_file_from_path(full)
|
||
|
|
if not file:
|
||
|
|
name = os.readlink(os.path.join(self.config.cache_dir, full))
|
||
|
|
full = posixpath.join(posixpath.dirname(full), name)
|
||
|
|
|
||
|
|
# Try again after resolving symlink
|
||
|
|
file = self.assets.get_file_from_path(full)
|
||
|
|
|
||
|
|
# This can theoretically never happen, as we're sure that we
|
||
|
|
# only replace files that we successfully extracted. However,
|
||
|
|
# we might have missed several cases, so it's better to throw
|
||
|
|
# here than to swallow the error.
|
||
|
|
if not file:
|
||
|
|
log.error(
|
||
|
|
"File not found. This is likely a bug in the built-in "
|
||
|
|
"privacy plugin. Please create an issue with a minimal "
|
||
|
|
"reproduction."
|
||
|
|
)
|
||
|
|
sys.exit(1)
|
||
|
|
|
||
|
|
# Create absolute URL for asset in script
|
||
|
|
if file.url.endswith(".js"):
|
||
|
|
url = posixpath.join(self.site.geturl(), file.url)
|
||
|
|
|
||
|
|
# Create relative URL for everything else
|
||
|
|
else:
|
||
|
|
url = file.url_relative_to(initiator)
|
||
|
|
|
||
|
|
# Switch external asset URL to local path
|
||
|
|
return match.group().replace(value, url)
|
||
|
|
|
||
|
|
# Resolve replacement expression according to asset type
|
||
|
|
_, extension = posixpath.splitext(initiator.dest_uri)
|
||
|
|
expr = re.compile(self.assets_expr_map[extension], re.I | re.M)
|
||
|
|
|
||
|
|
# Resolve links to external assets in file
|
||
|
|
self._save_to_file(
|
||
|
|
initiator.abs_dest_path,
|
||
|
|
expr.sub(replace, f.read())
|
||
|
|
)
|
||
|
|
|
||
|
|
# -------------------------------------------------------------------------
|
||
|
|
|
||
|
|
# Normalize (= canonicalize) path by removing trailing slashes, and ensure
|
||
|
|
# that hidden folders (`.` after `/`) are unhidden. Otherwise MkDocs will
|
||
|
|
# not consider them being part of the build and refuse to copy them.
|
||
|
|
def _path_from_url(self, url: URL):
|
||
|
|
path = posixpath.normpath(url.path)
|
||
|
|
path = re.sub(r"/\.", "/_", path)
|
||
|
|
|
||
|
|
# Compute digest of query string, as some URLs yield different results
|
||
|
|
# for different query strings, e.g. https://unsplash.com/random?Coffee
|
||
|
|
if url.query:
|
||
|
|
name, extension = posixpath.splitext(path)
|
||
|
|
|
||
|
|
# Inject digest after file name and before file extension, as
|
||
|
|
# done for style sheet and script files as well
|
||
|
|
digest = sha1(url.query.encode("utf-8")).hexdigest()[:8]
|
||
|
|
path = f"{name}.{digest}{extension}"
|
||
|
|
|
||
|
|
# Create and return URL without leading double slashes
|
||
|
|
url = url._replace(scheme = "", query = "", fragment = "", path = path)
|
||
|
|
return url.geturl()[2:]
|
||
|
|
|
||
|
|
# Create a file for the given path
|
||
|
|
def _path_to_file(self, path: str, config: MkDocsConfig):
|
||
|
|
return File(
|
||
|
|
posixpath.join(self.config.assets_fetch_dir, unquote(path)),
|
||
|
|
os.path.abspath(self.config.cache_dir),
|
||
|
|
config.site_dir,
|
||
|
|
False
|
||
|
|
)
|
||
|
|
|
||
|
|
# Create a file on the system with the given content
|
||
|
|
def _save_to_file(self, path: str, content: str | bytes):
|
||
|
|
os.makedirs(os.path.dirname(path), exist_ok = True)
|
||
|
|
if isinstance(content, str):
|
||
|
|
content = bytes(content, "utf-8")
|
||
|
|
with open(path, "wb") as f:
|
||
|
|
f.write(content)
|
||
|
|
|
||
|
|
# -----------------------------------------------------------------------------
|
||
|
|
# Data
|
||
|
|
# -----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
# Set up logging
|
||
|
|
log = logging.getLogger("mkdocs.material.privacy")
|
||
|
|
|
||
|
|
# Expected file extensions
|
||
|
|
extensions = {
|
||
|
|
"application/javascript": ".js",
|
||
|
|
"image/avif": ".avif",
|
||
|
|
"image/gif": ".gif",
|
||
|
|
"image/jpeg": ".jpg",
|
||
|
|
"image/png": ".png",
|
||
|
|
"image/svg+xml": ".svg",
|
||
|
|
"image/webp": ".webp",
|
||
|
|
"text/javascript": ".js",
|
||
|
|
"text/css": ".css"
|
||
|
|
}
|