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Diffstat (limited to 'Lib/packaging/pypi/dist.py')
| -rw-r--r-- | Lib/packaging/pypi/dist.py | 544 |
1 files changed, 544 insertions, 0 deletions
diff --git a/Lib/packaging/pypi/dist.py b/Lib/packaging/pypi/dist.py new file mode 100644 index 0000000..541465e --- /dev/null +++ b/Lib/packaging/pypi/dist.py @@ -0,0 +1,544 @@ +"""Classes representing releases and distributions retrieved from indexes. + +A project (= unique name) can have several releases (= versions) and +each release can have several distributions (= sdist and bdists). + +Release objects contain metadata-related information (see PEP 376); +distribution objects contain download-related information. +""" + +import re +import hashlib +import tempfile +import urllib.request +import urllib.parse +import urllib.error +import urllib.parse +from shutil import unpack_archive + +from packaging.errors import IrrationalVersionError +from packaging.version import (suggest_normalized_version, NormalizedVersion, + get_version_predicate) +from packaging.metadata import Metadata +from packaging.pypi.errors import (HashDoesNotMatch, UnsupportedHashName, + CantParseArchiveName) + + +__all__ = ['ReleaseInfo', 'DistInfo', 'ReleasesList', 'get_infos_from_url'] + +EXTENSIONS = ".tar.gz .tar.bz2 .tar .zip .tgz .egg".split() +MD5_HASH = re.compile(r'^.*#md5=([a-f0-9]+)$') +DIST_TYPES = ['bdist', 'sdist'] + + +class IndexReference: + """Mixin used to store the index reference""" + def set_index(self, index=None): + self._index = index + + +class ReleaseInfo(IndexReference): + """Represent a release of a project (a project with a specific version). + The release contain the _metadata informations related to this specific + version, and is also a container for distribution related informations. + + See the DistInfo class for more information about distributions. + """ + + def __init__(self, name, version, metadata=None, hidden=False, + index=None, **kwargs): + """ + :param name: the name of the distribution + :param version: the version of the distribution + :param metadata: the metadata fields of the release. + :type metadata: dict + :param kwargs: optional arguments for a new distribution. + """ + self.set_index(index) + self.name = name + self._version = None + self.version = version + if metadata: + self.metadata = Metadata(mapping=metadata) + else: + self.metadata = None + self.dists = {} + self.hidden = hidden + + if 'dist_type' in kwargs: + dist_type = kwargs.pop('dist_type') + self.add_distribution(dist_type, **kwargs) + + def set_version(self, version): + try: + self._version = NormalizedVersion(version) + except IrrationalVersionError: + suggestion = suggest_normalized_version(version) + if suggestion: + self.version = suggestion + else: + raise IrrationalVersionError(version) + + def get_version(self): + return self._version + + version = property(get_version, set_version) + + def fetch_metadata(self): + """If the metadata is not set, use the indexes to get it""" + if not self.metadata: + self._index.get_metadata(self.name, str(self.version)) + return self.metadata + + @property + def is_final(self): + """proxy to version.is_final""" + return self.version.is_final + + def fetch_distributions(self): + if self.dists is None: + self._index.get_distributions(self.name, str(self.version)) + if self.dists is None: + self.dists = {} + return self.dists + + def add_distribution(self, dist_type='sdist', python_version=None, + **params): + """Add distribution informations to this release. + If distribution information is already set for this distribution type, + add the given url paths to the distribution. This can be useful while + some of them fails to download. + + :param dist_type: the distribution type (eg. "sdist", "bdist", etc.) + :param params: the fields to be passed to the distribution object + (see the :class:DistInfo constructor). + """ + if dist_type not in DIST_TYPES: + raise ValueError(dist_type) + if dist_type in self.dists: + self.dists[dist_type].add_url(**params) + else: + self.dists[dist_type] = DistInfo(self, dist_type, + index=self._index, **params) + if python_version: + self.dists[dist_type].python_version = python_version + + def get_distribution(self, dist_type=None, prefer_source=True): + """Return a distribution. + + If dist_type is set, find first for this distribution type, and just + act as an alias of __get_item__. + + If prefer_source is True, search first for source distribution, and if + not return one existing distribution. + """ + if len(self.dists) == 0: + raise LookupError + if dist_type: + return self[dist_type] + if prefer_source: + if "sdist" in self.dists: + dist = self["sdist"] + else: + dist = next(self.dists.values()) + return dist + + def unpack(self, path=None, prefer_source=True): + """Unpack the distribution to the given path. + + If not destination is given, creates a temporary location. + + Returns the location of the extracted files (root). + """ + return self.get_distribution(prefer_source=prefer_source)\ + .unpack(path=path) + + def download(self, temp_path=None, prefer_source=True): + """Download the distribution, using the requirements. + + If more than one distribution match the requirements, use the last + version. + Download the distribution, and put it in the temp_path. If no temp_path + is given, creates and return one. + + Returns the complete absolute path to the downloaded archive. + """ + return self.get_distribution(prefer_source=prefer_source)\ + .download(path=temp_path) + + def set_metadata(self, metadata): + if not self.metadata: + self.metadata = Metadata() + self.metadata.update(metadata) + + def __getitem__(self, item): + """distributions are available using release["sdist"]""" + return self.dists[item] + + def _check_is_comparable(self, other): + if not isinstance(other, ReleaseInfo): + raise TypeError("cannot compare %s and %s" + % (type(self).__name__, type(other).__name__)) + elif self.name != other.name: + raise TypeError("cannot compare %s and %s" + % (self.name, other.name)) + + def __repr__(self): + return "<%s %s>" % (self.name, self.version) + + def __eq__(self, other): + self._check_is_comparable(other) + return self.version == other.version + + def __lt__(self, other): + self._check_is_comparable(other) + return self.version < other.version + + def __ne__(self, other): + return not self.__eq__(other) + + def __gt__(self, other): + return not (self.__lt__(other) or self.__eq__(other)) + + def __le__(self, other): + return self.__eq__(other) or self.__lt__(other) + + def __ge__(self, other): + return self.__eq__(other) or self.__gt__(other) + + # See http://docs.python.org/reference/datamodel#object.__hash__ + __hash__ = object.__hash__ + + +class DistInfo(IndexReference): + """Represents a distribution retrieved from an index (sdist, bdist, ...) + """ + + def __init__(self, release, dist_type=None, url=None, hashname=None, + hashval=None, is_external=True, python_version=None, + index=None): + """Create a new instance of DistInfo. + + :param release: a DistInfo class is relative to a release. + :param dist_type: the type of the dist (eg. source, bin-*, etc.) + :param url: URL where we found this distribution + :param hashname: the name of the hash we want to use. Refer to the + hashlib.new documentation for more information. + :param hashval: the hash value. + :param is_external: we need to know if the provided url comes from + an index browsing, or from an external resource. + + """ + self.set_index(index) + self.release = release + self.dist_type = dist_type + self.python_version = python_version + self._unpacked_dir = None + # set the downloaded path to None by default. The goal here + # is to not download distributions multiple times + self.downloaded_location = None + # We store urls in dict, because we need to have a bit more infos + # than the simple URL. It will be used later to find the good url to + # use. + # We have two _url* attributes: _url and urls. urls contains a list + # of dict for the different urls, and _url contains the choosen url, in + # order to dont make the selection process multiple times. + self.urls = [] + self._url = None + self.add_url(url, hashname, hashval, is_external) + + def add_url(self, url=None, hashname=None, hashval=None, is_external=True): + """Add a new url to the list of urls""" + if hashname is not None: + try: + hashlib.new(hashname) + except ValueError: + raise UnsupportedHashName(hashname) + if url not in [u['url'] for u in self.urls]: + self.urls.append({ + 'url': url, + 'hashname': hashname, + 'hashval': hashval, + 'is_external': is_external, + }) + # reset the url selection process + self._url = None + + @property + def url(self): + """Pick up the right url for the list of urls in self.urls""" + # We return internal urls over externals. + # If there is more than one internal or external, return the first + # one. + if self._url is None: + if len(self.urls) > 1: + internals_urls = [u for u in self.urls \ + if u['is_external'] == False] + if len(internals_urls) >= 1: + self._url = internals_urls[0] + if self._url is None: + self._url = self.urls[0] + return self._url + + @property + def is_source(self): + """return if the distribution is a source one or not""" + return self.dist_type == 'sdist' + + def download(self, path=None): + """Download the distribution to a path, and return it. + + If the path is given in path, use this, otherwise, generates a new one + Return the download location. + """ + if path is None: + path = tempfile.mkdtemp() + + # if we do not have downloaded it yet, do it. + if self.downloaded_location is None: + url = self.url['url'] + archive_name = urllib.parse.urlparse(url)[2].split('/')[-1] + filename, headers = urllib.request.urlretrieve(url, + path + "/" + archive_name) + self.downloaded_location = filename + self._check_md5(filename) + return self.downloaded_location + + def unpack(self, path=None): + """Unpack the distribution to the given path. + + If not destination is given, creates a temporary location. + + Returns the location of the extracted files (root). + """ + if not self._unpacked_dir: + if path is None: + path = tempfile.mkdtemp() + + filename = self.download(path) + unpack_archive(filename, path) + self._unpacked_dir = path + + return path + + def _check_md5(self, filename): + """Check that the md5 checksum of the given file matches the one in + url param""" + hashname = self.url['hashname'] + expected_hashval = self.url['hashval'] + if None not in (expected_hashval, hashname): + with open(filename, 'rb') as f: + hashval = hashlib.new(hashname) + hashval.update(f.read()) + + if hashval.hexdigest() != expected_hashval: + raise HashDoesNotMatch("got %s instead of %s" + % (hashval.hexdigest(), expected_hashval)) + + def __repr__(self): + if self.release is None: + return "<? ? %s>" % self.dist_type + + return "<%s %s %s>" % ( + self.release.name, self.release.version, self.dist_type or "") + + +class ReleasesList(IndexReference): + """A container of Release. + + Provides useful methods and facilities to sort and filter releases. + """ + def __init__(self, name, releases=None, contains_hidden=False, index=None): + self.set_index(index) + self.releases = [] + self.name = name + self.contains_hidden = contains_hidden + if releases: + self.add_releases(releases) + + def fetch_releases(self): + self._index.get_releases(self.name) + return self.releases + + def filter(self, predicate): + """Filter and return a subset of releases matching the given predicate. + """ + return ReleasesList(self.name, [release for release in self.releases + if predicate.match(release.version)], + index=self._index) + + def get_last(self, requirements, prefer_final=None): + """Return the "last" release, that satisfy the given predicates. + + "last" is defined by the version number of the releases, you also could + set prefer_final parameter to True or False to change the order results + """ + predicate = get_version_predicate(requirements) + releases = self.filter(predicate) + if len(releases) == 0: + return None + releases.sort_releases(prefer_final, reverse=True) + return releases[0] + + def add_releases(self, releases): + """Add releases in the release list. + + :param: releases is a list of ReleaseInfo objects. + """ + for r in releases: + self.add_release(release=r) + + def add_release(self, version=None, dist_type='sdist', release=None, + **dist_args): + """Add a release to the list. + + The release can be passed in the `release` parameter, and in this case, + it will be crawled to extract the useful informations if necessary, or + the release informations can be directly passed in the `version` and + `dist_type` arguments. + + Other keywords arguments can be provided, and will be forwarded to the + distribution creation (eg. the arguments of the DistInfo constructor). + """ + if release: + if release.name.lower() != self.name.lower(): + raise ValueError("%s is not the same project as %s" % + (release.name, self.name)) + version = str(release.version) + + if version not in self.get_versions(): + # append only if not already exists + self.releases.append(release) + for dist in release.dists.values(): + for url in dist.urls: + self.add_release(version, dist.dist_type, **url) + else: + matches = [r for r in self.releases + if str(r.version) == version and r.name == self.name] + if not matches: + release = ReleaseInfo(self.name, version, index=self._index) + self.releases.append(release) + else: + release = matches[0] + + release.add_distribution(dist_type=dist_type, **dist_args) + + def sort_releases(self, prefer_final=False, reverse=True, *args, **kwargs): + """Sort the results with the given properties. + + The `prefer_final` argument can be used to specify if final + distributions (eg. not dev, beta or alpha) would be preferred or not. + + Results can be inverted by using `reverse`. + + Any other parameter provided will be forwarded to the sorted call. You + cannot redefine the key argument of "sorted" here, as it is used + internally to sort the releases. + """ + + sort_by = [] + if prefer_final: + sort_by.append("is_final") + sort_by.append("version") + + self.releases.sort( + key=lambda i: tuple(getattr(i, arg) for arg in sort_by), + reverse=reverse, *args, **kwargs) + + def get_release(self, version): + """Return a release from its version.""" + matches = [r for r in self.releases if str(r.version) == version] + if len(matches) != 1: + raise KeyError(version) + return matches[0] + + def get_versions(self): + """Return a list of releases versions contained""" + return [str(r.version) for r in self.releases] + + def __getitem__(self, key): + return self.releases[key] + + def __len__(self): + return len(self.releases) + + def __repr__(self): + string = 'Project "%s"' % self.name + if self.get_versions(): + string += ' versions: %s' % ', '.join(self.get_versions()) + return '<%s>' % string + + +def get_infos_from_url(url, probable_dist_name=None, is_external=True): + """Get useful informations from an URL. + + Return a dict of (name, version, url, hashtype, hash, is_external) + + :param url: complete url of the distribution + :param probable_dist_name: A probable name of the project. + :param is_external: Tell if the url commes from an index or from + an external URL. + """ + # if the url contains a md5 hash, get it. + md5_hash = None + match = MD5_HASH.match(url) + if match is not None: + md5_hash = match.group(1) + # remove the hash + url = url.replace("#md5=%s" % md5_hash, "") + + # parse the archive name to find dist name and version + archive_name = urllib.parse.urlparse(url)[2].split('/')[-1] + extension_matched = False + # remove the extension from the name + for ext in EXTENSIONS: + if archive_name.endswith(ext): + archive_name = archive_name[:-len(ext)] + extension_matched = True + + name, version = split_archive_name(archive_name) + if extension_matched is True: + return {'name': name, + 'version': version, + 'url': url, + 'hashname': "md5", + 'hashval': md5_hash, + 'is_external': is_external, + 'dist_type': 'sdist'} + + +def split_archive_name(archive_name, probable_name=None): + """Split an archive name into two parts: name and version. + + Return the tuple (name, version) + """ + # Try to determine wich part is the name and wich is the version using the + # "-" separator. Take the larger part to be the version number then reduce + # if this not works. + def eager_split(str, maxsplit=2): + # split using the "-" separator + splits = str.rsplit("-", maxsplit) + name = splits[0] + version = "-".join(splits[1:]) + if version.startswith("-"): + version = version[1:] + if suggest_normalized_version(version) is None and maxsplit >= 0: + # we dont get a good version number: recurse ! + return eager_split(str, maxsplit - 1) + else: + return name, version + if probable_name is not None: + probable_name = probable_name.lower() + name = None + if probable_name is not None and probable_name in archive_name: + # we get the name from probable_name, if given. + name = probable_name + version = archive_name.lstrip(name) + else: + name, version = eager_split(archive_name) + + version = suggest_normalized_version(version) + if version is not None and name != "": + return name.lower(), version + else: + raise CantParseArchiveName(archive_name) |