initial import of the packaging package in the standard library
diff --git a/Lib/packaging/pypi/xmlrpc.py b/Lib/packaging/pypi/xmlrpc.py
new file mode 100644
index 0000000..7a9f6cc
--- /dev/null
+++ b/Lib/packaging/pypi/xmlrpc.py
@@ -0,0 +1,200 @@
+"""Spider using the XML-RPC PyPI API.
+
+This module contains the class Client, a spider that can be used to find
+and retrieve distributions from a project index (like the Python Package
+Index), using its XML-RPC API (see documentation of the reference
+implementation at http://wiki.python.org/moin/PyPiXmlRpc).
+"""
+
+import xmlrpc.client
+
+from packaging import logger
+from packaging.errors import IrrationalVersionError
+from packaging.version import get_version_predicate
+from packaging.pypi.base import BaseClient
+from packaging.pypi.errors import (ProjectNotFound, InvalidSearchField,
+ ReleaseNotFound)
+from packaging.pypi.dist import ReleaseInfo
+
+__all__ = ['Client', 'DEFAULT_XMLRPC_INDEX_URL']
+
+DEFAULT_XMLRPC_INDEX_URL = 'http://python.org/pypi'
+
+_SEARCH_FIELDS = ['name', 'version', 'author', 'author_email', 'maintainer',
+ 'maintainer_email', 'home_page', 'license', 'summary',
+ 'description', 'keywords', 'platform', 'download_url']
+
+
+class Client(BaseClient):
+ """Client to query indexes using XML-RPC method calls.
+
+ If no server_url is specified, use the default PyPI XML-RPC URL,
+ defined in the DEFAULT_XMLRPC_INDEX_URL constant::
+
+ >>> client = XMLRPCClient()
+ >>> client.server_url == DEFAULT_XMLRPC_INDEX_URL
+ True
+
+ >>> client = XMLRPCClient("http://someurl/")
+ >>> client.server_url
+ 'http://someurl/'
+ """
+
+ def __init__(self, server_url=DEFAULT_XMLRPC_INDEX_URL, prefer_final=False,
+ prefer_source=True):
+ super(Client, self).__init__(prefer_final, prefer_source)
+ self.server_url = server_url
+ self._projects = {}
+
+ def get_release(self, requirements, prefer_final=False):
+ """Return a release with all complete metadata and distribution
+ related informations.
+ """
+ prefer_final = self._get_prefer_final(prefer_final)
+ predicate = get_version_predicate(requirements)
+ releases = self.get_releases(predicate.name)
+ release = releases.get_last(predicate, prefer_final)
+ self.get_metadata(release.name, str(release.version))
+ self.get_distributions(release.name, str(release.version))
+ return release
+
+ def get_releases(self, requirements, prefer_final=None, show_hidden=True,
+ force_update=False):
+ """Return the list of existing releases for a specific project.
+
+ Cache the results from one call to another.
+
+ If show_hidden is True, return the hidden releases too.
+ If force_update is True, reprocess the index to update the
+ informations (eg. make a new XML-RPC call).
+ ::
+
+ >>> client = XMLRPCClient()
+ >>> client.get_releases('Foo')
+ ['1.1', '1.2', '1.3']
+
+ If no such project exists, raise a ProjectNotFound exception::
+
+ >>> client.get_project_versions('UnexistingProject')
+ ProjectNotFound: UnexistingProject
+
+ """
+ def get_versions(project_name, show_hidden):
+ return self.proxy.package_releases(project_name, show_hidden)
+
+ predicate = get_version_predicate(requirements)
+ prefer_final = self._get_prefer_final(prefer_final)
+ project_name = predicate.name
+ if not force_update and (project_name.lower() in self._projects):
+ project = self._projects[project_name.lower()]
+ if not project.contains_hidden and show_hidden:
+ # if hidden releases are requested, and have an existing
+ # list of releases that does not contains hidden ones
+ all_versions = get_versions(project_name, show_hidden)
+ existing_versions = project.get_versions()
+ hidden_versions = set(all_versions) - set(existing_versions)
+ for version in hidden_versions:
+ project.add_release(release=ReleaseInfo(project_name,
+ version, index=self._index))
+ else:
+ versions = get_versions(project_name, show_hidden)
+ if not versions:
+ raise ProjectNotFound(project_name)
+ project = self._get_project(project_name)
+ project.add_releases([ReleaseInfo(project_name, version,
+ index=self._index)
+ for version in versions])
+ project = project.filter(predicate)
+ if len(project) == 0:
+ raise ReleaseNotFound("%s" % predicate)
+ project.sort_releases(prefer_final)
+ return project
+
+
+ def get_distributions(self, project_name, version):
+ """Grab informations about distributions from XML-RPC.
+
+ Return a ReleaseInfo object, with distribution-related informations
+ filled in.
+ """
+ url_infos = self.proxy.release_urls(project_name, version)
+ project = self._get_project(project_name)
+ if version not in project.get_versions():
+ project.add_release(release=ReleaseInfo(project_name, version,
+ index=self._index))
+ release = project.get_release(version)
+ for info in url_infos:
+ packagetype = info['packagetype']
+ dist_infos = {'url': info['url'],
+ 'hashval': info['md5_digest'],
+ 'hashname': 'md5',
+ 'is_external': False,
+ 'python_version': info['python_version']}
+ release.add_distribution(packagetype, **dist_infos)
+ return release
+
+ def get_metadata(self, project_name, version):
+ """Retrieve project metadata.
+
+ Return a ReleaseInfo object, with metadata informations filled in.
+ """
+ # to be case-insensitive, get the informations from the XMLRPC API
+ projects = [d['name'] for d in
+ self.proxy.search({'name': project_name})
+ if d['name'].lower() == project_name]
+ if len(projects) > 0:
+ project_name = projects[0]
+
+ metadata = self.proxy.release_data(project_name, version)
+ project = self._get_project(project_name)
+ if version not in project.get_versions():
+ project.add_release(release=ReleaseInfo(project_name, version,
+ index=self._index))
+ release = project.get_release(version)
+ release.set_metadata(metadata)
+ return release
+
+ def search_projects(self, name=None, operator="or", **kwargs):
+ """Find using the keys provided in kwargs.
+
+ You can set operator to "and" or "or".
+ """
+ for key in kwargs:
+ if key not in _SEARCH_FIELDS:
+ raise InvalidSearchField(key)
+ if name:
+ kwargs["name"] = name
+ projects = self.proxy.search(kwargs, operator)
+ for p in projects:
+ project = self._get_project(p['name'])
+ try:
+ project.add_release(release=ReleaseInfo(p['name'],
+ p['version'], metadata={'summary': p['summary']},
+ index=self._index))
+ except IrrationalVersionError as e:
+ logger.warning("Irrational version error found: %s", e)
+ return [self._projects[p['name'].lower()] for p in projects]
+
+ def get_all_projects(self):
+ """Return the list of all projects registered in the package index"""
+ projects = self.proxy.list_packages()
+ for name in projects:
+ self.get_releases(name, show_hidden=True)
+
+ return [self._projects[name.lower()] for name in set(projects)]
+
+ @property
+ def proxy(self):
+ """Property used to return the XMLRPC server proxy.
+
+ If no server proxy is defined yet, creates a new one::
+
+ >>> client = XmlRpcClient()
+ >>> client.proxy()
+ <ServerProxy for python.org/pypi>
+
+ """
+ if not hasattr(self, '_server_proxy'):
+ self._server_proxy = xmlrpc.client.ServerProxy(self.server_url)
+
+ return self._server_proxy