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.venv/Lib/site-packages/pip/_internal/index/collector.py

"""
The main purpose of this module is to expose LinkCollector.collect_sources().
"""

import collections
import email.message
import functools
import itertools
import json
import logging
import os
import urllib.parse
import urllib.request
from dataclasses import dataclass
from html.parser import HTMLParser
from optparse import Values
from typing import (
    Callable,
    Dict,
    Iterable,
    List,
    MutableMapping,
    NamedTuple,
    Optional,
    Protocol,
    Sequence,
    Tuple,
    Union,
)

from pip._vendor import requests
from pip._vendor.requests import Response
from pip._vendor.requests.exceptions import RetryError, SSLError

from pip._internal.exceptions import NetworkConnectionError
from pip._internal.models.link import Link
from pip._internal.models.search_scope import SearchScope
from pip._internal.network.session import PipSession
from pip._internal.network.utils import raise_for_status
from pip._internal.utils.filetypes import is_archive_file
from pip._internal.utils.misc import redact_auth_from_url
from pip._internal.vcs import vcs

from .sources import CandidatesFromPage, LinkSource, build_source

logger = logging.getLogger(__name__)

ResponseHeaders = MutableMapping[str, str]


def _match_vcs_scheme(url: str) -> Optional[str]:
    """Look for VCS schemes in the URL.

    Returns the matched VCS scheme, or None if there's no match.
    """
    for scheme in vcs.schemes:
        if url.lower().startswith(scheme) and url[len(scheme)] in "+:":
            return scheme
    return None


class _NotAPIContent(Exception):
    def __init__(self, content_type: str, request_desc: str) -> None:
        super().__init__(content_type, request_desc)
        self.content_type = content_type
        self.request_desc = request_desc


def _ensure_api_header(response: Response) -> None:
    """
    Check the Content-Type header to ensure the response contains a Simple
    API Response.

    Raises `_NotAPIContent` if the content type is not a valid content-type.
    """
    content_type = response.headers.get("Content-Type", "Unknown")

    content_type_l = content_type.lower()
    if content_type_l.startswith(
        (
            "text/html",
            "application/vnd.pypi.simple.v1+html",
            "application/vnd.pypi.simple.v1+json",
        )
    ):
        return

    raise _NotAPIContent(content_type, response.request.method)


class _NotHTTP(Exception):
    pass


def _ensure_api_response(url: str, session: PipSession) -> None:
    """
    Send a HEAD request to the URL, and ensure the response contains a simple
    API Response.

    Raises `_NotHTTP` if the URL is not available for a HEAD request, or
    `_NotAPIContent` if the content type is not a valid content type.
    """
    scheme, netloc, path, query, fragment = urllib.parse.urlsplit(url)
    if scheme not in {"http", "https"}:
        raise _NotHTTP()

    resp = session.head(url, allow_redirects=True)
    raise_for_status(resp)

    _ensure_api_header(resp)


def _get_simple_response(url: str, session: PipSession) -> Response:
    """Access an Simple API response with GET, and return the response.

    This consists of three parts:

    1. If the URL looks suspiciously like an archive, send a HEAD first to
       check the Content-Type is HTML or Simple API, to avoid downloading a
       large file. Raise `_NotHTTP` if the content type cannot be determined, or
       `_NotAPIContent` if it is not HTML or a Simple API.
    2. Actually perform the request. Raise HTTP exceptions on network failures.
    3. Check the Content-Type header to make sure we got a Simple API response,
       and raise `_NotAPIContent` otherwise.
    """
    if is_archive_file(Link(url).filename):
        _ensure_api_response(url, session=session)

    logger.debug("Getting page %s", redact_auth_from_url(url))

    resp = session.get(
        url,
        headers={
            "Accept": ", ".join(
                [
                    "application/vnd.pypi.simple.v1+json",
                    "application/vnd.pypi.simple.v1+html; q=0.1",
                    "text/html; q=0.01",
                ]
            ),
            # We don't want to blindly returned cached data for
            # /simple/, because authors generally expecting that
            # twine upload && pip install will function, but if
            # they've done a pip install in the last ~10 minutes
            # it won't. Thus by setting this to zero we will not
            # blindly use any cached data, however the benefit of
            # using max-age=0 instead of no-cache, is that we will
            # still support conditional requests, so we will still
            # minimize traffic sent in cases where the page hasn't
            # changed at all, we will just always incur the round
            # trip for the conditional GET now instead of only
            # once per 10 minutes.
            # For more information, please see pypa/pip#5670.
            "Cache-Control": "max-age=0",
        },
    )
    raise_for_status(resp)

    # The check for archives above only works if the url ends with
    # something that looks like an archive. However that is not a
    # requirement of an url. Unless we issue a HEAD request on every
    # url we cannot know ahead of time for sure if something is a
    # Simple API response or not. However we can check after we've
    # downloaded it.
    _ensure_api_header(resp)

    logger.debug(
        "Fetched page %s as %s",
        redact_auth_from_url(url),
        resp.headers.get("Content-Type", "Unknown"),
    )

    return resp


def _get_encoding_from_headers(headers: ResponseHeaders) -> Optional[str]:
    """Determine if we have any encoding information in our headers."""
    if headers and "Content-Type" in headers:
        m = email.message.Message()
        m["content-type"] = headers["Content-Type"]
        charset = m.get_param("charset")
        if charset:
            return str(charset)
    return None


class CacheablePageContent:
    def __init__(self, page: "IndexContent") -> None:
        assert page.cache_link_parsing
        self.page = page

    def __eq__(self, other: object) -> bool:
        return isinstance(other, type(self)) and self.page.url == other.page.url

    def __hash__(self) -> int:
        return hash(self.page.url)


class ParseLinks(Protocol):
    def __call__(self, page: "IndexContent") -> Iterable[Link]: ...


def with_cached_index_content(fn: ParseLinks) -> ParseLinks:
    """
    Given a function that parses an Iterable[Link] from an IndexContent, cache the
    function's result (keyed by CacheablePageContent), unless the IndexContent
    `page` has `page.cache_link_parsing == False`.
    """

    @functools.lru_cache(maxsize=None)
    def wrapper(cacheable_page: CacheablePageContent) -> List[Link]:
        return list(fn(cacheable_page.page))

    @functools.wraps(fn)
    def wrapper_wrapper(page: "IndexContent") -> List[Link]:
        if page.cache_link_parsing:
            return wrapper(CacheablePageContent(page))
        return list(fn(page))

    return wrapper_wrapper


@with_cached_index_content
def parse_links(page: "IndexContent") -> Iterable[Link]:
    """
    Parse a Simple API's Index Content, and yield its anchor elements as Link objects.
    """

    content_type_l = page.content_type.lower()
    if content_type_l.startswith("application/vnd.pypi.simple.v1+json"):
        data = json.loads(page.content)
        for file in data.get("files", []):
            link = Link.from_json(file, page.url)
            if link is None:
                continue
            yield link
        return

    parser = HTMLLinkParser(page.url)
    encoding = page.encoding or "utf-8"
    parser.feed(page.content.decode(encoding))

    url = page.url
    base_url = parser.base_url or url
    for anchor in parser.anchors:
        link = Link.from_element(anchor, page_url=url, base_url=base_url)
        if link is None:
            continue
        yield link


@dataclass(frozen=True)
class IndexContent:
    """Represents one response (or page), along with its URL.

    :param encoding: the encoding to decode the given content.
    :param url: the URL from which the HTML was downloaded.
    :param cache_link_parsing: whether links parsed from this page's url
                               should be cached. PyPI index urls should
                               have this set to False, for example.
    """

    content: bytes
    content_type: str
    encoding: Optional[str]
    url: str
    cache_link_parsing: bool = True

    def __str__(self) -> str:
        return redact_auth_from_url(self.url)


class HTMLLinkParser(HTMLParser):
    """
    HTMLParser that keeps the first base HREF and a list of all anchor
    elements' attributes.
    """

    def __init__(self, url: str) -> None:
        super().__init__(convert_charrefs=True)

        self.url: str = url
        self.base_url: Optional[str] = None
        self.anchors: List[Dict[str, Optional[str]]] = []

    def handle_starttag(self, tag: str, attrs: List[Tuple[str, Optional[str]]]) -> None:
        if tag == "base" and self.base_url is None:
            href = self.get_href(attrs)
            if href is not None:
                self.base_url = href
        elif tag == "a":
            self.anchors.append(dict(attrs))

    def get_href(self, attrs: List[Tuple[str, Optional[str]]]) -> Optional[str]:
        for name, value in attrs:
            if name == "href":
                return value
        return None


def _handle_get_simple_fail(
    link: Link,
    reason: Union[str, Exception],
    meth: Optional[Callable[..., None]] = None,
) -> None:
    if meth is None:
        meth = logger.debug
    meth("Could not fetch URL %s: %s - skipping", link, reason)


def _make_index_content(
    response: Response, cache_link_parsing: bool = True
) -> IndexContent:
    encoding = _get_encoding_from_headers(response.headers)
    return IndexContent(
        response.content,
        response.headers["Content-Type"],
        encoding=encoding,
        url=response.url,
        cache_link_parsing=cache_link_parsing,
    )


def _get_index_content(link: Link, *, session: PipSession) -> Optional["IndexContent"]:
    url = link.url.split("#", 1)[0]

    # Check for VCS schemes that do not support lookup as web pages.
    vcs_scheme = _match_vcs_scheme(url)
    if vcs_scheme:
        logger.warning(
            "Cannot look at %s URL %s because it does not support lookup as web pages.",
            vcs_scheme,
            link,
        )
        return None

    # Tack index.html onto file:// URLs that point to directories
    scheme, _, path, _, _, _ = urllib.parse.urlparse(url)
    if scheme == "file" and os.path.isdir(urllib.request.url2pathname(path)):
        # add trailing slash if not present so urljoin doesn't trim
        # final segment
        if not url.endswith("/"):
            url += "/"
        # TODO: In the future, it would be nice if pip supported PEP 691
        #       style responses in the file:// URLs, however there's no
        #       standard file extension for application/vnd.pypi.simple.v1+json
        #       so we'll need to come up with something on our own.
        url = urllib.parse.urljoin(url, "index.html")
        logger.debug(" file: URL is directory, getting %s", url)

    try:
        resp = _get_simple_response(url, session=session)
    except _NotHTTP:
        logger.warning(
            "Skipping page %s because it looks like an archive, and cannot "
            "be checked by a HTTP HEAD request.",
            link,
        )
    except _NotAPIContent as exc:
        logger.warning(
            "Skipping page %s because the %s request got Content-Type: %s. "
            "The only supported Content-Types are application/vnd.pypi.simple.v1+json, "
            "application/vnd.pypi.simple.v1+html, and text/html",
            link,
            exc.request_desc,
            exc.content_type,
        )
    except NetworkConnectionError as exc:
        _handle_get_simple_fail(link, exc)
    except RetryError as exc:
        _handle_get_simple_fail(link, exc)
    except SSLError as exc:
        reason = "There was a problem confirming the ssl certificate: "
        reason += str(exc)
        _handle_get_simple_fail(link, reason, meth=logger.info)
    except requests.ConnectionError as exc:
        _handle_get_simple_fail(link, f"connection error: {exc}")
    except requests.Timeout:
        _handle_get_simple_fail(link, "timed out")
    else:
        return _make_index_content(resp, cache_link_parsing=link.cache_link_parsing)
    return None


class CollectedSources(NamedTuple):
    find_links: Sequence[Optional[LinkSource]]
    index_urls: Sequence[Optional[LinkSource]]


class LinkCollector:
    """
    Responsible for collecting Link objects from all configured locations,
    making network requests as needed.

    The class's main method is its collect_sources() method.
    """

    def __init__(
        self,
        session: PipSession,
        search_scope: SearchScope,
    ) -> None:
        self.search_scope = search_scope
        self.session = session

    @classmethod
    def create(
        cls,
        session: PipSession,
        options: Values,
        suppress_no_index: bool = False,
    ) -> "LinkCollector":
        """
        :param session: The Session to use to make requests.
        :param suppress_no_index: Whether to ignore the --no-index option
            when constructing the SearchScope object.
        """
        index_urls = [options.index_url] + options.extra_index_urls
        if options.no_index and not suppress_no_index:
            logger.debug(
                "Ignoring indexes: %s",
                ",".join(redact_auth_from_url(url) for url in index_urls),
            )
            index_urls = []

        # Make sure find_links is a list before passing to create().
        find_links = options.find_links or []

        search_scope = SearchScope.create(
            find_links=find_links,
            index_urls=index_urls,
            no_index=options.no_index,
        )
        link_collector = LinkCollector(
            session=session,
            search_scope=search_scope,
        )
        return link_collector

    @property
    def find_links(self) -> List[str]:
        return self.search_scope.find_links

    def fetch_response(self, location: Link) -> Optional[IndexContent]:
        """
        Fetch an HTML page containing package links.
        """
        return _get_index_content(location, session=self.session)

    def collect_sources(
        self,
        project_name: str,
        candidates_from_page: CandidatesFromPage,
    ) -> CollectedSources:
        # The OrderedDict calls deduplicate sources by URL.
        index_url_sources = collections.OrderedDict(
            build_source(
                loc,
                candidates_from_page=candidates_from_page,
                page_validator=self.session.is_secure_origin,
                expand_dir=False,
                cache_link_parsing=False,
                project_name=project_name,
            )
            for loc in self.search_scope.get_index_urls_locations(project_name)
        ).values()
        find_links_sources = collections.OrderedDict(
            build_source(
                loc,
                candidates_from_page=candidates_from_page,
                page_validator=self.session.is_secure_origin,
                expand_dir=True,
                cache_link_parsing=True,
                project_name=project_name,
            )
            for loc in self.find_links
        ).values()

        if logger.isEnabledFor(logging.DEBUG):
            lines = [
                f"* {s.link}"
                for s in itertools.chain(find_links_sources, index_url_sources)
                if s is not None and s.link is not None
            ]
            lines = [
                f"{len(lines)} location(s) to search "
                f"for versions of {project_name}:"
            ] + lines
            logger.debug("\n".join(lines))

        return CollectedSources(
            find_links=list(find_links_sources),
            index_urls=list(index_url_sources),
        )

495 lines•15.9 KB

python

.venv/Lib/site-packages/pip/_vendor/distlib/metadata.py

Raw Download

# -*- coding: utf-8 -*-
#
# Copyright (C) 2012 The Python Software Foundation.
# See LICENSE.txt and CONTRIBUTORS.txt.
#
"""Implementation of the Metadata for Python packages PEPs.

Supports all metadata formats (1.0, 1.1, 1.2, 1.3/2.1 and 2.2).
"""
from __future__ import unicode_literals

import codecs
from email import message_from_file
import json
import logging
import re

from . import DistlibException, __version__
from .compat import StringIO, string_types, text_type
from .markers import interpret
from .util import extract_by_key, get_extras
from .version import get_scheme, PEP440_VERSION_RE

logger = logging.getLogger(__name__)


class MetadataMissingError(DistlibException):
    """A required metadata is missing"""


class MetadataConflictError(DistlibException):
    """Attempt to read or write metadata fields that are conflictual."""


class MetadataUnrecognizedVersionError(DistlibException):
    """Unknown metadata version number."""


class MetadataInvalidError(DistlibException):
    """A metadata value is invalid"""


# public API of this module
__all__ = ['Metadata', 'PKG_INFO_ENCODING', 'PKG_INFO_PREFERRED_VERSION']

# Encoding used for the PKG-INFO files
PKG_INFO_ENCODING = 'utf-8'

# preferred version. Hopefully will be changed
# to 1.2 once PEP 345 is supported everywhere
PKG_INFO_PREFERRED_VERSION = '1.1'

_LINE_PREFIX_1_2 = re.compile('\n       \\|')
_LINE_PREFIX_PRE_1_2 = re.compile('\n        ')
_241_FIELDS = ('Metadata-Version', 'Name', 'Version', 'Platform', 'Summary', 'Description', 'Keywords', 'Home-page',
               'Author', 'Author-email', 'License')

_314_FIELDS = ('Metadata-Version', 'Name', 'Version', 'Platform', 'Supported-Platform', 'Summary', 'Description',
               'Keywords', 'Home-page', 'Author', 'Author-email', 'License', 'Classifier', 'Download-URL', 'Obsoletes',
               'Provides', 'Requires')

_314_MARKERS = ('Obsoletes', 'Provides', 'Requires', 'Classifier', 'Download-URL')

_345_FIELDS = ('Metadata-Version', 'Name', 'Version', 'Platform', 'Supported-Platform', 'Summary', 'Description',
               'Keywords', 'Home-page', 'Author', 'Author-email', 'Maintainer', 'Maintainer-email', 'License',
               'Classifier', 'Download-URL', 'Obsoletes-Dist', 'Project-URL', 'Provides-Dist', 'Requires-Dist',
               'Requires-Python', 'Requires-External')

_345_MARKERS = ('Provides-Dist', 'Requires-Dist', 'Requires-Python', 'Obsoletes-Dist', 'Requires-External',
                'Maintainer', 'Maintainer-email', 'Project-URL')

_426_FIELDS = ('Metadata-Version', 'Name', 'Version', 'Platform', 'Supported-Platform', 'Summary', 'Description',
               'Keywords', 'Home-page', 'Author', 'Author-email', 'Maintainer', 'Maintainer-email', 'License',
               'Classifier', 'Download-URL', 'Obsoletes-Dist', 'Project-URL', 'Provides-Dist', 'Requires-Dist',
               'Requires-Python', 'Requires-External', 'Private-Version', 'Obsoleted-By', 'Setup-Requires-Dist',
               'Extension', 'Provides-Extra')

_426_MARKERS = ('Private-Version', 'Provides-Extra', 'Obsoleted-By', 'Setup-Requires-Dist', 'Extension')

# See issue #106: Sometimes 'Requires' and 'Provides' occur wrongly in
# the metadata. Include them in the tuple literal below to allow them
# (for now).
# Ditto for Obsoletes - see issue #140.
_566_FIELDS = _426_FIELDS + ('Description-Content-Type', 'Requires', 'Provides', 'Obsoletes')

_566_MARKERS = ('Description-Content-Type', )

_643_MARKERS = ('Dynamic', 'License-File')

_643_FIELDS = _566_FIELDS + _643_MARKERS

_ALL_FIELDS = set()
_ALL_FIELDS.update(_241_FIELDS)
_ALL_FIELDS.update(_314_FIELDS)
_ALL_FIELDS.update(_345_FIELDS)
_ALL_FIELDS.update(_426_FIELDS)
_ALL_FIELDS.update(_566_FIELDS)
_ALL_FIELDS.update(_643_FIELDS)

EXTRA_RE = re.compile(r'''extra\s*==\s*("([^"]+)"|'([^']+)')''')


def _version2fieldlist(version):
    if version == '1.0':
        return _241_FIELDS
    elif version == '1.1':
        return _314_FIELDS
    elif version == '1.2':
        return _345_FIELDS
    elif version in ('1.3', '2.1'):
        # avoid adding field names if already there
        return _345_FIELDS + tuple(f for f in _566_FIELDS if f not in _345_FIELDS)
    elif version == '2.0':
        raise ValueError('Metadata 2.0 is withdrawn and not supported')
        # return _426_FIELDS
    elif version == '2.2':
        return _643_FIELDS
    raise MetadataUnrecognizedVersionError(version)


def _best_version(fields):
    """Detect the best version depending on the fields used."""

    def _has_marker(keys, markers):
        return any(marker in keys for marker in markers)

    keys = [key for key, value in fields.items() if value not in ([], 'UNKNOWN', None)]
    possible_versions = ['1.0', '1.1', '1.2', '1.3', '2.1', '2.2']  # 2.0 removed

    # first let's try to see if a field is not part of one of the version
    for key in keys:
        if key not in _241_FIELDS and '1.0' in possible_versions:
            possible_versions.remove('1.0')
            logger.debug('Removed 1.0 due to %s', key)
        if key not in _314_FIELDS and '1.1' in possible_versions:
            possible_versions.remove('1.1')
            logger.debug('Removed 1.1 due to %s', key)
        if key not in _345_FIELDS and '1.2' in possible_versions:
            possible_versions.remove('1.2')
            logger.debug('Removed 1.2 due to %s', key)
        if key not in _566_FIELDS and '1.3' in possible_versions:
            possible_versions.remove('1.3')
            logger.debug('Removed 1.3 due to %s', key)
        if key not in _566_FIELDS and '2.1' in possible_versions:
            if key != 'Description':  # In 2.1, description allowed after headers
                possible_versions.remove('2.1')
                logger.debug('Removed 2.1 due to %s', key)
        if key not in _643_FIELDS and '2.2' in possible_versions:
            possible_versions.remove('2.2')
            logger.debug('Removed 2.2 due to %s', key)
        # if key not in _426_FIELDS and '2.0' in possible_versions:
        # possible_versions.remove('2.0')
        # logger.debug('Removed 2.0 due to %s', key)

    # possible_version contains qualified versions
    if len(possible_versions) == 1:
        return possible_versions[0]  # found !
    elif len(possible_versions) == 0:
        logger.debug('Out of options - unknown metadata set: %s', fields)
        raise MetadataConflictError('Unknown metadata set')

    # let's see if one unique marker is found
    is_1_1 = '1.1' in possible_versions and _has_marker(keys, _314_MARKERS)
    is_1_2 = '1.2' in possible_versions and _has_marker(keys, _345_MARKERS)
    is_2_1 = '2.1' in possible_versions and _has_marker(keys, _566_MARKERS)
    # is_2_0 = '2.0' in possible_versions and _has_marker(keys, _426_MARKERS)
    is_2_2 = '2.2' in possible_versions and _has_marker(keys, _643_MARKERS)
    if int(is_1_1) + int(is_1_2) + int(is_2_1) + int(is_2_2) > 1:
        raise MetadataConflictError('You used incompatible 1.1/1.2/2.1/2.2 fields')

    # we have the choice, 1.0, or 1.2, 2.1 or 2.2
    #   - 1.0 has a broken Summary field but works with all tools
    #   - 1.1 is to avoid
    #   - 1.2 fixes Summary but has little adoption
    #   - 2.1 adds more features
    #   - 2.2 is the latest
    if not is_1_1 and not is_1_2 and not is_2_1 and not is_2_2:
        # we couldn't find any specific marker
        if PKG_INFO_PREFERRED_VERSION in possible_versions:
            return PKG_INFO_PREFERRED_VERSION
    if is_1_1:
        return '1.1'
    if is_1_2:
        return '1.2'
    if is_2_1:
        return '2.1'
    # if is_2_2:
    # return '2.2'

    return '2.2'


# This follows the rules about transforming keys as described in
# https://www.python.org/dev/peps/pep-0566/#id17
_ATTR2FIELD = {name.lower().replace("-", "_"): name for name in _ALL_FIELDS}
_FIELD2ATTR = {field: attr for attr, field in _ATTR2FIELD.items()}

_PREDICATE_FIELDS = ('Requires-Dist', 'Obsoletes-Dist', 'Provides-Dist')
_VERSIONS_FIELDS = ('Requires-Python', )
_VERSION_FIELDS = ('Version', )
_LISTFIELDS = ('Platform', 'Classifier', 'Obsoletes', 'Requires', 'Provides', 'Obsoletes-Dist', 'Provides-Dist',
               'Requires-Dist', 'Requires-External', 'Project-URL', 'Supported-Platform', 'Setup-Requires-Dist',
               'Provides-Extra', 'Extension', 'License-File')
_LISTTUPLEFIELDS = ('Project-URL', )

_ELEMENTSFIELD = ('Keywords', )

_UNICODEFIELDS = ('Author', 'Maintainer', 'Summary', 'Description')

_MISSING = object()

_FILESAFE = re.compile('[^A-Za-z0-9.]+')


def _get_name_and_version(name, version, for_filename=False):
    """Return the distribution name with version.

    If for_filename is true, return a filename-escaped form."""
    if for_filename:
        # For both name and version any runs of non-alphanumeric or '.'
        # characters are replaced with a single '-'.  Additionally any
        # spaces in the version string become '.'
        name = _FILESAFE.sub('-', name)
        version = _FILESAFE.sub('-', version.replace(' ', '.'))
    return '%s-%s' % (name, version)


class LegacyMetadata(object):
    """The legacy metadata of a release.

    Supports versions 1.0, 1.1, 1.2, 2.0 and 1.3/2.1 (auto-detected). You can
    instantiate the class with one of these arguments (or none):
    - *path*, the path to a metadata file
    - *fileobj* give a file-like object with metadata as content
    - *mapping* is a dict-like object
    - *scheme* is a version scheme name
    """

    # TODO document the mapping API and UNKNOWN default key

    def __init__(self, path=None, fileobj=None, mapping=None, scheme='default'):
        if [path, fileobj, mapping].count(None) < 2:
            raise TypeError('path, fileobj and mapping are exclusive')
        self._fields = {}
        self.requires_files = []
        self._dependencies = None
        self.scheme = scheme
        if path is not None:
            self.read(path)
        elif fileobj is not None:
            self.read_file(fileobj)
        elif mapping is not None:
            self.update(mapping)
            self.set_metadata_version()

    def set_metadata_version(self):
        self._fields['Metadata-Version'] = _best_version(self._fields)

    def _write_field(self, fileobj, name, value):
        fileobj.write('%s: %s\n' % (name, value))

    def __getitem__(self, name):
        return self.get(name)

    def __setitem__(self, name, value):
        return self.set(name, value)

    def __delitem__(self, name):
        field_name = self._convert_name(name)
        try:
            del self._fields[field_name]
        except KeyError:
            raise KeyError(name)

    def __contains__(self, name):
        return (name in self._fields or self._convert_name(name) in self._fields)

    def _convert_name(self, name):
        if name in _ALL_FIELDS:
            return name
        name = name.replace('-', '_').lower()
        return _ATTR2FIELD.get(name, name)

    def _default_value(self, name):
        if name in _LISTFIELDS or name in _ELEMENTSFIELD:
            return []
        return 'UNKNOWN'

    def _remove_line_prefix(self, value):
        if self.metadata_version in ('1.0', '1.1'):
            return _LINE_PREFIX_PRE_1_2.sub('\n', value)
        else:
            return _LINE_PREFIX_1_2.sub('\n', value)

    def __getattr__(self, name):
        if name in _ATTR2FIELD:
            return self[name]
        raise AttributeError(name)

    #
    # Public API
    #

    def get_fullname(self, filesafe=False):
        """
        Return the distribution name with version.

        If filesafe is true, return a filename-escaped form.
        """
        return _get_name_and_version(self['Name'], self['Version'], filesafe)

    def is_field(self, name):
        """return True if name is a valid metadata key"""
        name = self._convert_name(name)
        return name in _ALL_FIELDS

    def is_multi_field(self, name):
        name = self._convert_name(name)
        return name in _LISTFIELDS

    def read(self, filepath):
        """Read the metadata values from a file path."""
        fp = codecs.open(filepath, 'r', encoding='utf-8')
        try:
            self.read_file(fp)
        finally:
            fp.close()

    def read_file(self, fileob):
        """Read the metadata values from a file object."""
        msg = message_from_file(fileob)
        self._fields['Metadata-Version'] = msg['metadata-version']

        # When reading, get all the fields we can
        for field in _ALL_FIELDS:
            if field not in msg:
                continue
            if field in _LISTFIELDS:
                # we can have multiple lines
                values = msg.get_all(field)
                if field in _LISTTUPLEFIELDS and values is not None:
                    values = [tuple(value.split(',')) for value in values]
                self.set(field, values)
            else:
                # single line
                value = msg[field]
                if value is not None and value != 'UNKNOWN':
                    self.set(field, value)

        # PEP 566 specifies that the body be used for the description, if
        # available
        body = msg.get_payload()
        self["Description"] = body if body else self["Description"]
        # logger.debug('Attempting to set metadata for %s', self)
        # self.set_metadata_version()

    def write(self, filepath, skip_unknown=False):
        """Write the metadata fields to filepath."""
        fp = codecs.open(filepath, 'w', encoding='utf-8')
        try:
            self.write_file(fp, skip_unknown)
        finally:
            fp.close()

    def write_file(self, fileobject, skip_unknown=False):
        """Write the PKG-INFO format data to a file object."""
        self.set_metadata_version()

        for field in _version2fieldlist(self['Metadata-Version']):
            values = self.get(field)
            if skip_unknown and values in ('UNKNOWN', [], ['UNKNOWN']):
                continue
            if field in _ELEMENTSFIELD:
                self._write_field(fileobject, field, ','.join(values))
                continue
            if field not in _LISTFIELDS:
                if field == 'Description':
                    if self.metadata_version in ('1.0', '1.1'):
                        values = values.replace('\n', '\n        ')
                    else:
                        values = values.replace('\n', '\n       |')
                values = [values]

            if field in _LISTTUPLEFIELDS:
                values = [','.join(value) for value in values]

            for value in values:
                self._write_field(fileobject, field, value)

    def update(self, other=None, **kwargs):
        """Set metadata values from the given iterable `other` and kwargs.

        Behavior is like `dict.update`: If `other` has a ``keys`` method,
        they are looped over and ``self[key]`` is assigned ``other[key]``.
        Else, ``other`` is an iterable of ``(key, value)`` iterables.

        Keys that don't match a metadata field or that have an empty value are
        dropped.
        """

        def _set(key, value):
            if key in _ATTR2FIELD and value:
                self.set(self._convert_name(key), value)

        if not other:
            # other is None or empty container
            pass
        elif hasattr(other, 'keys'):
            for k in other.keys():
                _set(k, other[k])
        else:
            for k, v in other:
                _set(k, v)

        if kwargs:
            for k, v in kwargs.items():
                _set(k, v)

    def set(self, name, value):
        """Control then set a metadata field."""
        name = self._convert_name(name)

        if ((name in _ELEMENTSFIELD or name == 'Platform') and not isinstance(value, (list, tuple))):
            if isinstance(value, string_types):
                value = [v.strip() for v in value.split(',')]
            else:
                value = []
        elif (name in _LISTFIELDS and not isinstance(value, (list, tuple))):
            if isinstance(value, string_types):
                value = [value]
            else:
                value = []

        if logger.isEnabledFor(logging.WARNING):
            project_name = self['Name']

            scheme = get_scheme(self.scheme)
            if name in _PREDICATE_FIELDS and value is not None:
                for v in value:
                    # check that the values are valid
                    if not scheme.is_valid_matcher(v.split(';')[0]):
                        logger.warning("'%s': '%s' is not valid (field '%s')", project_name, v, name)
            # FIXME this rejects UNKNOWN, is that right?
            elif name in _VERSIONS_FIELDS and value is not None:
                if not scheme.is_valid_constraint_list(value):
                    logger.warning("'%s': '%s' is not a valid version (field '%s')", project_name, value, name)
            elif name in _VERSION_FIELDS and value is not None:
                if not scheme.is_valid_version(value):
                    logger.warning("'%s': '%s' is not a valid version (field '%s')", project_name, value, name)

        if name in _UNICODEFIELDS:
            if name == 'Description':
                value = self._remove_line_prefix(value)

        self._fields[name] = value

    def get(self, name, default=_MISSING):
        """Get a metadata field."""
        name = self._convert_name(name)
        if name not in self._fields:
            if default is _MISSING:
                default = self._default_value(name)
            return default
        if name in _UNICODEFIELDS:
            value = self._fields[name]
            return value
        elif name in _LISTFIELDS:
            value = self._fields[name]
            if value is None:
                return []
            res = []
            for val in value:
                if name not in _LISTTUPLEFIELDS:
                    res.append(val)
                else:
                    # That's for Project-URL
                    res.append((val[0], val[1]))
            return res

        elif name in _ELEMENTSFIELD:
            value = self._fields[name]
            if isinstance(value, string_types):
                return value.split(',')
        return self._fields[name]

    def check(self, strict=False):
        """Check if the metadata is compliant. If strict is True then raise if
        no Name or Version are provided"""
        self.set_metadata_version()

        # XXX should check the versions (if the file was loaded)
        missing, warnings = [], []

        for attr in ('Name', 'Version'):  # required by PEP 345
            if attr not in self:
                missing.append(attr)

        if strict and missing != []:
            msg = 'missing required metadata: %s' % ', '.join(missing)
            raise MetadataMissingError(msg)

        for attr in ('Home-page', 'Author'):
            if attr not in self:
                missing.append(attr)

        # checking metadata 1.2 (XXX needs to check 1.1, 1.0)
        if self['Metadata-Version'] != '1.2':
            return missing, warnings

        scheme = get_scheme(self.scheme)

        def are_valid_constraints(value):
            for v in value:
                if not scheme.is_valid_matcher(v.split(';')[0]):
                    return False
            return True

        for fields, controller in ((_PREDICATE_FIELDS, are_valid_constraints),
                                   (_VERSIONS_FIELDS, scheme.is_valid_constraint_list), (_VERSION_FIELDS,
                                                                                         scheme.is_valid_version)):
            for field in fields:
                value = self.get(field, None)
                if value is not None and not controller(value):
                    warnings.append("Wrong value for '%s': %s" % (field, value))

        return missing, warnings

    def todict(self, skip_missing=False):
        """Return fields as a dict.

        Field names will be converted to use the underscore-lowercase style
        instead of hyphen-mixed case (i.e. home_page instead of Home-page).
        This is as per https://www.python.org/dev/peps/pep-0566/#id17.
        """
        self.set_metadata_version()

        fields = _version2fieldlist(self['Metadata-Version'])

        data = {}

        for field_name in fields:
            if not skip_missing or field_name in self._fields:
                key = _FIELD2ATTR[field_name]
                if key != 'project_url':
                    data[key] = self[field_name]
                else:
                    data[key] = [','.join(u) for u in self[field_name]]

        return data

    def add_requirements(self, requirements):
        if self['Metadata-Version'] == '1.1':
            # we can't have 1.1 metadata *and* Setuptools requires
            for field in ('Obsoletes', 'Requires', 'Provides'):
                if field in self:
                    del self[field]
        self['Requires-Dist'] += requirements

    # Mapping API
    # TODO could add iter* variants

    def keys(self):
        return list(_version2fieldlist(self['Metadata-Version']))

    def __iter__(self):
        for key in self.keys():
            yield key

    def values(self):
        return [self[key] for key in self.keys()]

    def items(self):
        return [(key, self[key]) for key in self.keys()]

    def __repr__(self):
        return '<%s %s %s>' % (self.__class__.__name__, self.name, self.version)


METADATA_FILENAME = 'pydist.json'
WHEEL_METADATA_FILENAME = 'metadata.json'
LEGACY_METADATA_FILENAME = 'METADATA'


class Metadata(object):
    """
    The metadata of a release. This implementation uses 2.1
    metadata where possible. If not possible, it wraps a LegacyMetadata
    instance which handles the key-value metadata format.
    """

    METADATA_VERSION_MATCHER = re.compile(r'^\d+(\.\d+)*$')

    NAME_MATCHER = re.compile('^[0-9A-Z]([0-9A-Z_.-]*[0-9A-Z])?$', re.I)

    FIELDNAME_MATCHER = re.compile('^[A-Z]([0-9A-Z-]*[0-9A-Z])?$', re.I)

    VERSION_MATCHER = PEP440_VERSION_RE

    SUMMARY_MATCHER = re.compile('.{1,2047}')

    METADATA_VERSION = '2.0'

    GENERATOR = 'distlib (%s)' % __version__

    MANDATORY_KEYS = {
        'name': (),
        'version': (),
        'summary': ('legacy', ),
    }

    INDEX_KEYS = ('name version license summary description author '
                  'author_email keywords platform home_page classifiers '
                  'download_url')

    DEPENDENCY_KEYS = ('extras run_requires test_requires build_requires '
                       'dev_requires provides meta_requires obsoleted_by '
                       'supports_environments')

    SYNTAX_VALIDATORS = {
        'metadata_version': (METADATA_VERSION_MATCHER, ()),
        'name': (NAME_MATCHER, ('legacy', )),
        'version': (VERSION_MATCHER, ('legacy', )),
        'summary': (SUMMARY_MATCHER, ('legacy', )),
        'dynamic': (FIELDNAME_MATCHER, ('legacy', )),
    }

    __slots__ = ('_legacy', '_data', 'scheme')

    def __init__(self, path=None, fileobj=None, mapping=None, scheme='default'):
        if [path, fileobj, mapping].count(None) < 2:
            raise TypeError('path, fileobj and mapping are exclusive')
        self._legacy = None
        self._data = None
        self.scheme = scheme
        # import pdb; pdb.set_trace()
        if mapping is not None:
            try:
                self._validate_mapping(mapping, scheme)
                self._data = mapping
            except MetadataUnrecognizedVersionError:
                self._legacy = LegacyMetadata(mapping=mapping, scheme=scheme)
                self.validate()
        else:
            data = None
            if path:
                with open(path, 'rb') as f:
                    data = f.read()
            elif fileobj:
                data = fileobj.read()
            if data is None:
                # Initialised with no args - to be added
                self._data = {
                    'metadata_version': self.METADATA_VERSION,
                    'generator': self.GENERATOR,
                }
            else:
                if not isinstance(data, text_type):
                    data = data.decode('utf-8')
                try:
                    self._data = json.loads(data)
                    self._validate_mapping(self._data, scheme)
                except ValueError:
                    # Note: MetadataUnrecognizedVersionError does not
                    # inherit from ValueError (it's a DistlibException,
                    # which should not inherit from ValueError).
                    # The ValueError comes from the json.load - if that
                    # succeeds and we get a validation error, we want
                    # that to propagate
                    self._legacy = LegacyMetadata(fileobj=StringIO(data), scheme=scheme)
                    self.validate()

    common_keys = set(('name', 'version', 'license', 'keywords', 'summary'))

    none_list = (None, list)
    none_dict = (None, dict)

    mapped_keys = {
        'run_requires': ('Requires-Dist', list),
        'build_requires': ('Setup-Requires-Dist', list),
        'dev_requires': none_list,
        'test_requires': none_list,
        'meta_requires': none_list,
        'extras': ('Provides-Extra', list),
        'modules': none_list,
        'namespaces': none_list,
        'exports': none_dict,
        'commands': none_dict,
        'classifiers': ('Classifier', list),
        'source_url': ('Download-URL', None),
        'metadata_version': ('Metadata-Version', None),
    }

    del none_list, none_dict

    def __getattribute__(self, key):
        common = object.__getattribute__(self, 'common_keys')
        mapped = object.__getattribute__(self, 'mapped_keys')
        if key in mapped:
            lk, maker = mapped[key]
            if self._legacy:
                if lk is None:
                    result = None if maker is None else maker()
                else:
                    result = self._legacy.get(lk)
            else:
                value = None if maker is None else maker()
                if key not in ('commands', 'exports', 'modules', 'namespaces', 'classifiers'):
                    result = self._data.get(key, value)
                else:
                    # special cases for PEP 459
                    sentinel = object()
                    result = sentinel
                    d = self._data.get('extensions')
                    if d:
                        if key == 'commands':
                            result = d.get('python.commands', value)
                        elif key == 'classifiers':
                            d = d.get('python.details')
                            if d:
                                result = d.get(key, value)
                        else:
                            d = d.get('python.exports')
                            if not d:
                                d = self._data.get('python.exports')
                            if d:
                                result = d.get(key, value)
                    if result is sentinel:
                        result = value
        elif key not in common:
            result = object.__getattribute__(self, key)
        elif self._legacy:
            result = self._legacy.get(key)
        else:
            result = self._data.get(key)
        return result

    def _validate_value(self, key, value, scheme=None):
        if key in self.SYNTAX_VALIDATORS:
            pattern, exclusions = self.SYNTAX_VALIDATORS[key]
            if (scheme or self.scheme) not in exclusions:
                m = pattern.match(value)
                if not m:
                    raise MetadataInvalidError("'%s' is an invalid value for "
                                               "the '%s' property" % (value, key))

    def __setattr__(self, key, value):
        self._validate_value(key, value)
        common = object.__getattribute__(self, 'common_keys')
        mapped = object.__getattribute__(self, 'mapped_keys')
        if key in mapped:
            lk, _ = mapped[key]
            if self._legacy:
                if lk is None:
                    raise NotImplementedError
                self._legacy[lk] = value
            elif key not in ('commands', 'exports', 'modules', 'namespaces', 'classifiers'):
                self._data[key] = value
            else:
                # special cases for PEP 459
                d = self._data.setdefault('extensions', {})
                if key == 'commands':
                    d['python.commands'] = value
                elif key == 'classifiers':
                    d = d.setdefault('python.details', {})
                    d[key] = value
                else:
                    d = d.setdefault('python.exports', {})
                    d[key] = value
        elif key not in common:
            object.__setattr__(self, key, value)
        else:
            if key == 'keywords':
                if isinstance(value, string_types):
                    value = value.strip()
                    if value:
                        value = value.split()
                    else:
                        value = []
            if self._legacy:
                self._legacy[key] = value
            else:
                self._data[key] = value

    @property
    def name_and_version(self):
        return _get_name_and_version(self.name, self.version, True)

    @property
    def provides(self):
        if self._legacy:
            result = self._legacy['Provides-Dist']
        else:
            result = self._data.setdefault('provides', [])
        s = '%s (%s)' % (self.name, self.version)
        if s not in result:
            result.append(s)
        return result

    @provides.setter
    def provides(self, value):
        if self._legacy:
            self._legacy['Provides-Dist'] = value
        else:
            self._data['provides'] = value

    def get_requirements(self, reqts, extras=None, env=None):
        """
        Base method to get dependencies, given a set of extras
        to satisfy and an optional environment context.
        :param reqts: A list of sometimes-wanted dependencies,
                      perhaps dependent on extras and environment.
        :param extras: A list of optional components being requested.
        :param env: An optional environment for marker evaluation.
        """
        if self._legacy:
            result = reqts
        else:
            result = []
            extras = get_extras(extras or [], self.extras)
            for d in reqts:
                if 'extra' not in d and 'environment' not in d:
                    # unconditional
                    include = True
                else:
                    if 'extra' not in d:
                        # Not extra-dependent - only environment-dependent
                        include = True
                    else:
                        include = d.get('extra') in extras
                    if include:
                        # Not excluded because of extras, check environment
                        marker = d.get('environment')
                        if marker:
                            include = interpret(marker, env)
                if include:
                    result.extend(d['requires'])
            for key in ('build', 'dev', 'test'):
                e = ':%s:' % key
                if e in extras:
                    extras.remove(e)
                    # A recursive call, but it should terminate since 'test'
                    # has been removed from the extras
                    reqts = self._data.get('%s_requires' % key, [])
                    result.extend(self.get_requirements(reqts, extras=extras, env=env))
        return result

    @property
    def dictionary(self):
        if self._legacy:
            return self._from_legacy()
        return self._data

    @property
    def dependencies(self):
        if self._legacy:
            raise NotImplementedError
        else:
            return extract_by_key(self._data, self.DEPENDENCY_KEYS)

    @dependencies.setter
    def dependencies(self, value):
        if self._legacy:
            raise NotImplementedError
        else:
            self._data.update(value)

    def _validate_mapping(self, mapping, scheme):
        if mapping.get('metadata_version') != self.METADATA_VERSION:
            raise MetadataUnrecognizedVersionError()
        missing = []
        for key, exclusions in self.MANDATORY_KEYS.items():
            if key not in mapping:
                if scheme not in exclusions:
                    missing.append(key)
        if missing:
            msg = 'Missing metadata items: %s' % ', '.join(missing)
            raise MetadataMissingError(msg)
        for k, v in mapping.items():
            self._validate_value(k, v, scheme)

    def validate(self):
        if self._legacy:
            missing, warnings = self._legacy.check(True)
            if missing or warnings:
                logger.warning('Metadata: missing: %s, warnings: %s', missing, warnings)
        else:
            self._validate_mapping(self._data, self.scheme)

    def todict(self):
        if self._legacy:
            return self._legacy.todict(True)
        else:
            result = extract_by_key(self._data, self.INDEX_KEYS)
            return result

    def _from_legacy(self):
        assert self._legacy and not self._data
        result = {
            'metadata_version': self.METADATA_VERSION,
            'generator': self.GENERATOR,
        }
        lmd = self._legacy.todict(True)  # skip missing ones
        for k in ('name', 'version', 'license', 'summary', 'description', 'classifier'):
            if k in lmd:
                if k == 'classifier':
                    nk = 'classifiers'
                else:
                    nk = k
                result[nk] = lmd[k]
        kw = lmd.get('Keywords', [])
        if kw == ['']:
            kw = []
        result['keywords'] = kw
        keys = (('requires_dist', 'run_requires'), ('setup_requires_dist', 'build_requires'))
        for ok, nk in keys:
            if ok in lmd and lmd[ok]:
                result[nk] = [{'requires': lmd[ok]}]
        result['provides'] = self.provides
        # author = {}
        # maintainer = {}
        return result

    LEGACY_MAPPING = {
        'name': 'Name',
        'version': 'Version',
        ('extensions', 'python.details', 'license'): 'License',
        'summary': 'Summary',
        'description': 'Description',
        ('extensions', 'python.project', 'project_urls', 'Home'): 'Home-page',
        ('extensions', 'python.project', 'contacts', 0, 'name'): 'Author',
        ('extensions', 'python.project', 'contacts', 0, 'email'): 'Author-email',
        'source_url': 'Download-URL',
        ('extensions', 'python.details', 'classifiers'): 'Classifier',
    }

    def _to_legacy(self):

        def process_entries(entries):
            reqts = set()
            for e in entries:
                extra = e.get('extra')
                env = e.get('environment')
                rlist = e['requires']
                for r in rlist:
                    if not env and not extra:
                        reqts.add(r)
                    else:
                        marker = ''
                        if extra:
                            marker = 'extra == "%s"' % extra
                        if env:
                            if marker:
                                marker = '(%s) and %s' % (env, marker)
                            else:
                                marker = env
                        reqts.add(';'.join((r, marker)))
            return reqts

        assert self._data and not self._legacy
        result = LegacyMetadata()
        nmd = self._data
        # import pdb; pdb.set_trace()
        for nk, ok in self.LEGACY_MAPPING.items():
            if not isinstance(nk, tuple):
                if nk in nmd:
                    result[ok] = nmd[nk]
            else:
                d = nmd
                found = True
                for k in nk:
                    try:
                        d = d[k]
                    except (KeyError, IndexError):
                        found = False
                        break
                if found:
                    result[ok] = d
        r1 = process_entries(self.run_requires + self.meta_requires)
        r2 = process_entries(self.build_requires + self.dev_requires)
        if self.extras:
            result['Provides-Extra'] = sorted(self.extras)
        result['Requires-Dist'] = sorted(r1)
        result['Setup-Requires-Dist'] = sorted(r2)
        # TODO: any other fields wanted
        return result

    def write(self, path=None, fileobj=None, legacy=False, skip_unknown=True):
        if [path, fileobj].count(None) != 1:
            raise ValueError('Exactly one of path and fileobj is needed')
        self.validate()
        if legacy:
            if self._legacy:
                legacy_md = self._legacy
            else:
                legacy_md = self._to_legacy()
            if path:
                legacy_md.write(path, skip_unknown=skip_unknown)
            else:
                legacy_md.write_file(fileobj, skip_unknown=skip_unknown)
        else:
            if self._legacy:
                d = self._from_legacy()
            else:
                d = self._data
            if fileobj:
                json.dump(d, fileobj, ensure_ascii=True, indent=2, sort_keys=True)
            else:
                with codecs.open(path, 'w', 'utf-8') as f:
                    json.dump(d, f, ensure_ascii=True, indent=2, sort_keys=True)

    def add_requirements(self, requirements):
        if self._legacy:
            self._legacy.add_requirements(requirements)
        else:
            run_requires = self._data.setdefault('run_requires', [])
            always = None
            for entry in run_requires:
                if 'environment' not in entry and 'extra' not in entry:
                    always = entry
                    break
            if always is None:
                always = {'requires': requirements}
                run_requires.insert(0, always)
            else:
                rset = set(always['requires']) | set(requirements)
                always['requires'] = sorted(rset)

    def __repr__(self):
        name = self.name or '(no name)'
        version = self.version or 'no version'
        return '<%s %s %s (%s)>' % (self.__class__.__name__, self.metadata_version, name, version)

1,032 lines•37.8 KB

python

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