mirror of
https://github.com/Lucas-V-L/lucasvl.nl.git
synced 2024-10-29 19:38:16 -05:00
506 lines
16 KiB
Python
506 lines
16 KiB
Python
"""
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The main purpose of this module is to expose LinkCollector.collect_sources().
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"""
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import collections
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import email.message
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import functools
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import itertools
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import json
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import logging
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import os
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import urllib.parse
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import urllib.request
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from html.parser import HTMLParser
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from optparse import Values
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from typing import (
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TYPE_CHECKING,
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Callable,
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Dict,
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Iterable,
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List,
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MutableMapping,
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NamedTuple,
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Optional,
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Sequence,
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Tuple,
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Union,
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)
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from pip._vendor import requests
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from pip._vendor.requests import Response
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from pip._vendor.requests.exceptions import RetryError, SSLError
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from pip._internal.exceptions import NetworkConnectionError
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from pip._internal.models.link import Link
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from pip._internal.models.search_scope import SearchScope
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from pip._internal.network.session import PipSession
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from pip._internal.network.utils import raise_for_status
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from pip._internal.utils.filetypes import is_archive_file
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from pip._internal.utils.misc import redact_auth_from_url
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from pip._internal.vcs import vcs
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from .sources import CandidatesFromPage, LinkSource, build_source
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if TYPE_CHECKING:
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from typing import Protocol
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else:
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Protocol = object
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logger = logging.getLogger(__name__)
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ResponseHeaders = MutableMapping[str, str]
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def _match_vcs_scheme(url: str) -> Optional[str]:
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"""Look for VCS schemes in the URL.
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Returns the matched VCS scheme, or None if there's no match.
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"""
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for scheme in vcs.schemes:
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if url.lower().startswith(scheme) and url[len(scheme)] in "+:":
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return scheme
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return None
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class _NotAPIContent(Exception):
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def __init__(self, content_type: str, request_desc: str) -> None:
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super().__init__(content_type, request_desc)
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self.content_type = content_type
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self.request_desc = request_desc
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def _ensure_api_header(response: Response) -> None:
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"""
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Check the Content-Type header to ensure the response contains a Simple
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API Response.
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Raises `_NotAPIContent` if the content type is not a valid content-type.
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"""
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content_type = response.headers.get("Content-Type", "Unknown")
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content_type_l = content_type.lower()
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if content_type_l.startswith(
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(
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"text/html",
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"application/vnd.pypi.simple.v1+html",
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"application/vnd.pypi.simple.v1+json",
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)
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):
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return
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raise _NotAPIContent(content_type, response.request.method)
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class _NotHTTP(Exception):
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pass
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def _ensure_api_response(url: str, session: PipSession) -> None:
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"""
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Send a HEAD request to the URL, and ensure the response contains a simple
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API Response.
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Raises `_NotHTTP` if the URL is not available for a HEAD request, or
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`_NotAPIContent` if the content type is not a valid content type.
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"""
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scheme, netloc, path, query, fragment = urllib.parse.urlsplit(url)
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if scheme not in {"http", "https"}:
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raise _NotHTTP()
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resp = session.head(url, allow_redirects=True)
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raise_for_status(resp)
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_ensure_api_header(resp)
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def _get_simple_response(url: str, session: PipSession) -> Response:
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"""Access an Simple API response with GET, and return the response.
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This consists of three parts:
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1. If the URL looks suspiciously like an archive, send a HEAD first to
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check the Content-Type is HTML or Simple API, to avoid downloading a
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large file. Raise `_NotHTTP` if the content type cannot be determined, or
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`_NotAPIContent` if it is not HTML or a Simple API.
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2. Actually perform the request. Raise HTTP exceptions on network failures.
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3. Check the Content-Type header to make sure we got a Simple API response,
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and raise `_NotAPIContent` otherwise.
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"""
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if is_archive_file(Link(url).filename):
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_ensure_api_response(url, session=session)
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logger.debug("Getting page %s", redact_auth_from_url(url))
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resp = session.get(
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url,
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headers={
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"Accept": ", ".join(
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[
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"application/vnd.pypi.simple.v1+json",
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"application/vnd.pypi.simple.v1+html; q=0.1",
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"text/html; q=0.01",
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]
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),
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# We don't want to blindly returned cached data for
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# /simple/, because authors generally expecting that
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# twine upload && pip install will function, but if
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# they've done a pip install in the last ~10 minutes
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# it won't. Thus by setting this to zero we will not
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# blindly use any cached data, however the benefit of
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# using max-age=0 instead of no-cache, is that we will
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# still support conditional requests, so we will still
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# minimize traffic sent in cases where the page hasn't
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# changed at all, we will just always incur the round
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# trip for the conditional GET now instead of only
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# once per 10 minutes.
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# For more information, please see pypa/pip#5670.
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"Cache-Control": "max-age=0",
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},
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)
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raise_for_status(resp)
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# The check for archives above only works if the url ends with
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# something that looks like an archive. However that is not a
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# requirement of an url. Unless we issue a HEAD request on every
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# url we cannot know ahead of time for sure if something is a
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# Simple API response or not. However we can check after we've
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# downloaded it.
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_ensure_api_header(resp)
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logger.debug(
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"Fetched page %s as %s",
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redact_auth_from_url(url),
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resp.headers.get("Content-Type", "Unknown"),
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)
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return resp
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def _get_encoding_from_headers(headers: ResponseHeaders) -> Optional[str]:
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"""Determine if we have any encoding information in our headers."""
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if headers and "Content-Type" in headers:
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m = email.message.Message()
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m["content-type"] = headers["Content-Type"]
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charset = m.get_param("charset")
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if charset:
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return str(charset)
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return None
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class CacheablePageContent:
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def __init__(self, page: "IndexContent") -> None:
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assert page.cache_link_parsing
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self.page = page
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def __eq__(self, other: object) -> bool:
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return isinstance(other, type(self)) and self.page.url == other.page.url
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def __hash__(self) -> int:
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return hash(self.page.url)
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class ParseLinks(Protocol):
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def __call__(self, page: "IndexContent") -> Iterable[Link]:
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...
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def with_cached_index_content(fn: ParseLinks) -> ParseLinks:
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"""
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Given a function that parses an Iterable[Link] from an IndexContent, cache the
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function's result (keyed by CacheablePageContent), unless the IndexContent
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`page` has `page.cache_link_parsing == False`.
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"""
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@functools.lru_cache(maxsize=None)
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def wrapper(cacheable_page: CacheablePageContent) -> List[Link]:
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return list(fn(cacheable_page.page))
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@functools.wraps(fn)
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def wrapper_wrapper(page: "IndexContent") -> List[Link]:
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if page.cache_link_parsing:
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return wrapper(CacheablePageContent(page))
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return list(fn(page))
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return wrapper_wrapper
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@with_cached_index_content
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def parse_links(page: "IndexContent") -> Iterable[Link]:
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"""
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Parse a Simple API's Index Content, and yield its anchor elements as Link objects.
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"""
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content_type_l = page.content_type.lower()
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if content_type_l.startswith("application/vnd.pypi.simple.v1+json"):
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data = json.loads(page.content)
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for file in data.get("files", []):
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link = Link.from_json(file, page.url)
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if link is None:
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continue
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yield link
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return
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parser = HTMLLinkParser(page.url)
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encoding = page.encoding or "utf-8"
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parser.feed(page.content.decode(encoding))
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url = page.url
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base_url = parser.base_url or url
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for anchor in parser.anchors:
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link = Link.from_element(anchor, page_url=url, base_url=base_url)
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if link is None:
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continue
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yield link
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class IndexContent:
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"""Represents one response (or page), along with its URL"""
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def __init__(
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self,
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content: bytes,
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content_type: str,
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encoding: Optional[str],
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url: str,
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cache_link_parsing: bool = True,
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) -> None:
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"""
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:param encoding: the encoding to decode the given content.
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:param url: the URL from which the HTML was downloaded.
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:param cache_link_parsing: whether links parsed from this page's url
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should be cached. PyPI index urls should
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have this set to False, for example.
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"""
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self.content = content
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self.content_type = content_type
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self.encoding = encoding
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self.url = url
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self.cache_link_parsing = cache_link_parsing
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def __str__(self) -> str:
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return redact_auth_from_url(self.url)
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class HTMLLinkParser(HTMLParser):
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"""
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HTMLParser that keeps the first base HREF and a list of all anchor
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elements' attributes.
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"""
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def __init__(self, url: str) -> None:
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super().__init__(convert_charrefs=True)
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self.url: str = url
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self.base_url: Optional[str] = None
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self.anchors: List[Dict[str, Optional[str]]] = []
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def handle_starttag(self, tag: str, attrs: List[Tuple[str, Optional[str]]]) -> None:
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if tag == "base" and self.base_url is None:
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href = self.get_href(attrs)
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if href is not None:
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self.base_url = href
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elif tag == "a":
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self.anchors.append(dict(attrs))
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def get_href(self, attrs: List[Tuple[str, Optional[str]]]) -> Optional[str]:
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for name, value in attrs:
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if name == "href":
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return value
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return None
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def _handle_get_simple_fail(
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link: Link,
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reason: Union[str, Exception],
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meth: Optional[Callable[..., None]] = None,
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) -> None:
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if meth is None:
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meth = logger.debug
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meth("Could not fetch URL %s: %s - skipping", link, reason)
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def _make_index_content(
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response: Response, cache_link_parsing: bool = True
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) -> IndexContent:
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encoding = _get_encoding_from_headers(response.headers)
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return IndexContent(
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response.content,
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response.headers["Content-Type"],
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encoding=encoding,
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url=response.url,
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cache_link_parsing=cache_link_parsing,
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)
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def _get_index_content(link: Link, *, session: PipSession) -> Optional["IndexContent"]:
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url = link.url.split("#", 1)[0]
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# Check for VCS schemes that do not support lookup as web pages.
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vcs_scheme = _match_vcs_scheme(url)
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if vcs_scheme:
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logger.warning(
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"Cannot look at %s URL %s because it does not support lookup as web pages.",
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vcs_scheme,
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link,
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)
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return None
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# Tack index.html onto file:// URLs that point to directories
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scheme, _, path, _, _, _ = urllib.parse.urlparse(url)
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if scheme == "file" and os.path.isdir(urllib.request.url2pathname(path)):
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# add trailing slash if not present so urljoin doesn't trim
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# final segment
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if not url.endswith("/"):
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url += "/"
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# TODO: In the future, it would be nice if pip supported PEP 691
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# style respones in the file:// URLs, however there's no
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# standard file extension for application/vnd.pypi.simple.v1+json
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# so we'll need to come up with something on our own.
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url = urllib.parse.urljoin(url, "index.html")
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logger.debug(" file: URL is directory, getting %s", url)
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try:
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resp = _get_simple_response(url, session=session)
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except _NotHTTP:
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logger.warning(
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"Skipping page %s because it looks like an archive, and cannot "
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"be checked by a HTTP HEAD request.",
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link,
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)
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except _NotAPIContent as exc:
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logger.warning(
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"Skipping page %s because the %s request got Content-Type: %s. "
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"The only supported Content-Types are application/vnd.pypi.simple.v1+json, "
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"application/vnd.pypi.simple.v1+html, and text/html",
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link,
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exc.request_desc,
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exc.content_type,
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)
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except NetworkConnectionError as exc:
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_handle_get_simple_fail(link, exc)
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except RetryError as exc:
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_handle_get_simple_fail(link, exc)
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except SSLError as exc:
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reason = "There was a problem confirming the ssl certificate: "
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reason += str(exc)
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_handle_get_simple_fail(link, reason, meth=logger.info)
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except requests.ConnectionError as exc:
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_handle_get_simple_fail(link, f"connection error: {exc}")
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except requests.Timeout:
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_handle_get_simple_fail(link, "timed out")
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else:
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return _make_index_content(resp, cache_link_parsing=link.cache_link_parsing)
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return None
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class CollectedSources(NamedTuple):
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find_links: Sequence[Optional[LinkSource]]
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index_urls: Sequence[Optional[LinkSource]]
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class LinkCollector:
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"""
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Responsible for collecting Link objects from all configured locations,
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making network requests as needed.
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The class's main method is its collect_sources() method.
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"""
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def __init__(
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self,
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session: PipSession,
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search_scope: SearchScope,
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) -> None:
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self.search_scope = search_scope
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self.session = session
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@classmethod
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def create(
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cls,
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session: PipSession,
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options: Values,
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suppress_no_index: bool = False,
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) -> "LinkCollector":
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"""
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:param session: The Session to use to make requests.
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:param suppress_no_index: Whether to ignore the --no-index option
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when constructing the SearchScope object.
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"""
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index_urls = [options.index_url] + options.extra_index_urls
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if options.no_index and not suppress_no_index:
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logger.debug(
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"Ignoring indexes: %s",
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",".join(redact_auth_from_url(url) for url in index_urls),
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)
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index_urls = []
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# Make sure find_links is a list before passing to create().
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find_links = options.find_links or []
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search_scope = SearchScope.create(
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find_links=find_links,
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index_urls=index_urls,
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no_index=options.no_index,
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)
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link_collector = LinkCollector(
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session=session,
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search_scope=search_scope,
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)
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return link_collector
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@property
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def find_links(self) -> List[str]:
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return self.search_scope.find_links
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def fetch_response(self, location: Link) -> Optional[IndexContent]:
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"""
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Fetch an HTML page containing package links.
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"""
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return _get_index_content(location, session=self.session)
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def collect_sources(
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self,
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project_name: str,
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candidates_from_page: CandidatesFromPage,
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) -> CollectedSources:
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# The OrderedDict calls deduplicate sources by URL.
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index_url_sources = collections.OrderedDict(
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build_source(
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loc,
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candidates_from_page=candidates_from_page,
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page_validator=self.session.is_secure_origin,
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expand_dir=False,
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cache_link_parsing=False,
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)
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for loc in self.search_scope.get_index_urls_locations(project_name)
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).values()
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find_links_sources = collections.OrderedDict(
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build_source(
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loc,
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candidates_from_page=candidates_from_page,
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page_validator=self.session.is_secure_origin,
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expand_dir=True,
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cache_link_parsing=True,
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)
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for loc in self.find_links
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).values()
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if logger.isEnabledFor(logging.DEBUG):
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lines = [
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f"* {s.link}"
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for s in itertools.chain(find_links_sources, index_url_sources)
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if s is not None and s.link is not None
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]
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lines = [
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f"{len(lines)} location(s) to search "
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f"for versions of {project_name}:"
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] + lines
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logger.debug("\n".join(lines))
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return CollectedSources(
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find_links=list(find_links_sources),
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index_urls=list(index_url_sources),
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)
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