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import logging
import mimetypes
import os
import pathlib
from typing import Callable, Iterable, Optional, Tuple
from pip._internal.models.candidate import InstallationCandidate
from pip._internal.models.link import Link
from pip._internal.utils.urls import path_to_url, url_to_path
from pip._internal.vcs import is_url
logger = logging.getLogger(__name__)
FoundCandidates = Iterable[InstallationCandidate]
FoundLinks = Iterable[Link]
CandidatesFromPage = Callable[[Link], Iterable[InstallationCandidate]]
PageValidator = Callable[[Link], bool]
class LinkSource:
@property
def link(self) -> Optional[Link]:
"""Returns the underlying link, if there's one."""
raise NotImplementedError()
def page_candidates(self) -> FoundCandidates:
"""Candidates found by parsing an archive listing HTML file."""
raise NotImplementedError()
def file_links(self) -> FoundLinks:
"""Links found by specifying archives directly."""
raise NotImplementedError()
def _is_html_file(file_url: str) -> bool:
return mimetypes.guess_type(file_url, strict=False)[0] == "text/html"
class _FlatDirectorySource(LinkSource):
"""Link source specified by ``--find-links=<path-to-dir>``.
This looks the content of the directory, and returns:
* ``page_candidates``: Links listed on each HTML file in the directory.
* ``file_candidates``: Archives in the directory.
"""
def __init__(
self,
candidates_from_page: CandidatesFromPage,
path: str,
) -> None:
self._candidates_from_page = candidates_from_page
self._path = pathlib.Path(os.path.realpath(path))
@property
def link(self) -> Optional[Link]:
return None
def page_candidates(self) -> FoundCandidates:
for path in self._path.iterdir():
url = path_to_url(str(path))
if not _is_html_file(url):
continue
yield from self._candidates_from_page(Link(url))
def file_links(self) -> FoundLinks:
for path in self._path.iterdir():
url = path_to_url(str(path))
if _is_html_file(url):
continue
yield Link(url)
class _LocalFileSource(LinkSource):
"""``--find-links=<path-or-url>`` or ``--[extra-]index-url=<path-or-url>``.
If a URL is supplied, it must be a ``file:`` URL. If a path is supplied to
the option, it is converted to a URL first. This returns:
* ``page_candidates``: Links listed on an HTML file.
* ``file_candidates``: The non-HTML file.
"""
def __init__(
self,
candidates_from_page: CandidatesFromPage,
link: Link,
) -> None:
self._candidates_from_page = candidates_from_page
self._link = link
@property
def link(self) -> Optional[Link]:
return self._link
def page_candidates(self) -> FoundCandidates:
if not _is_html_file(self._link.url):
return
yield from self._candidates_from_page(self._link)
def file_links(self) -> FoundLinks:
if _is_html_file(self._link.url):
return
yield self._link
class _RemoteFileSource(LinkSource):
"""``--find-links=<url>`` or ``--[extra-]index-url=<url>``.
This returns:
* ``page_candidates``: Links listed on an HTML file.
* ``file_candidates``: The non-HTML file.
"""
def __init__(
self,
candidates_from_page: CandidatesFromPage,
page_validator: PageValidator,
link: Link,
) -> None:
self._candidates_from_page = candidates_from_page
self._page_validator = page_validator
self._link = link
@property
def link(self) -> Optional[Link]:
return self._link
def page_candidates(self) -> FoundCandidates:
if not self._page_validator(self._link):
return
yield from self._candidates_from_page(self._link)
def file_links(self) -> FoundLinks:
yield self._link
class _IndexDirectorySource(LinkSource):
"""``--[extra-]index-url=<path-to-directory>``.
This is treated like a remote URL; ``candidates_from_page`` contains logic
for this by appending ``index.html`` to the link.
"""
def __init__(
self,
candidates_from_page: CandidatesFromPage,
link: Link,
) -> None:
self._candidates_from_page = candidates_from_page
self._link = link
@property
def link(self) -> Optional[Link]:
return self._link
def page_candidates(self) -> FoundCandidates:
yield from self._candidates_from_page(self._link)
def file_links(self) -> FoundLinks:
return ()
def build_source(
location: str,
*,
candidates_from_page: CandidatesFromPage,
page_validator: PageValidator,
expand_dir: bool,
cache_link_parsing: bool,
) -> Tuple[Optional[str], Optional[LinkSource]]:
path: Optional[str] = None
url: Optional[str] = None
if os.path.exists(location): # Is a local path.
url = path_to_url(location)
path = location
elif location.startswith("file:"): # A file: URL.
url = location
path = url_to_path(location)
elif is_url(location):
url = location
if url is None:
msg = (
"Location '%s' is ignored: "
"it is either a non-existing path or lacks a specific scheme."
)
logger.warning(msg, location)
return (None, None)
if path is None:
source: LinkSource = _RemoteFileSource(
candidates_from_page=candidates_from_page,
page_validator=page_validator,
link=Link(url, cache_link_parsing=cache_link_parsing),
)
return (url, source)
if os.path.isdir(path):
if expand_dir:
source = _FlatDirectorySource(
candidates_from_page=candidates_from_page,
path=path,
)
else:
source = _IndexDirectorySource(
candidates_from_page=candidates_from_page,
link=Link(url, cache_link_parsing=cache_link_parsing),
)
return (url, source)
elif os.path.isfile(path):
source = _LocalFileSource(
candidates_from_page=candidates_from_page,
link=Link(url, cache_link_parsing=cache_link_parsing),
)
return (url, source)
logger.warning(
"Location '%s' is ignored: it is neither a file nor a directory.",
location,
)
return (url, None)
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