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# -*- coding: utf-8 -*-
#
# Copyright (C) 2013 Vinay Sajip.
# Licensed to the Python Software Foundation under a contributor agreement.
# See LICENSE.txt and CONTRIBUTORS.txt.
#
import codecs
import json
import logging
import os
import shutil
import socket
try:
    import ssl
except ImportError:
    ssl = None
import subprocess
import sys
import tempfile
try:
    import threading
except ImportError:
    import dummy_threading as threading

from compat import unittest, Request
if ssl:
    from support import HTTPSServerThread

from distlib import DistlibException
from distlib.compat import urlopen, HTTPError, URLError
from distlib.index import PackageIndex
from distlib.metadata import Metadata, MetadataMissingError, METADATA_FILENAME
from distlib.util import zip_dir

if ssl:
    from distlib.util import HTTPSHandler

logger = logging.getLogger(__name__)

HERE = os.path.abspath(os.path.dirname(__file__))

if 'HOME' in os.environ:
    PYPIRC = os.path.expandvars('$HOME/.pypirc')
else:
    PYPIRC = None

class PackageIndexTestCase(unittest.TestCase):
    run_test_server = True
    test_server_url = 'http://localhost:8080/'

    @classmethod
    def setUpClass(cls):
        if cls.run_test_server:
            cls.server = None
            server_script = os.path.join(HERE, 'pypi-server-standalone.py')
            if not os.path.exists(server_script):
                logger.debug('test server not available - some tests '
                             'will be skipped.')
                return
            pwdfn = os.path.join(HERE, 'passwords')
            if not os.path.exists(pwdfn):   # pragma: no cover
                with open(pwdfn, 'w') as f:
                    f.write('test:secret\n')
            pkgdir = os.path.join(HERE, 'packages')
            if not os.path.isdir(pkgdir):   # pragma: no cover
                os.mkdir(pkgdir)
            cls.sink = sink = open(os.devnull, 'w')
            cmd = [sys.executable, 'pypi-server-standalone.py',
                   '-P', 'passwords', 'packages']
            cls.server = subprocess.Popen(cmd, stdout=sink, stderr=sink,
                                          cwd=HERE)
            # wait for the server to start up
            response = None
            while response is None:
                try:
                    response = urlopen(cls.test_server_url)
                except URLError:
                    pass

    @classmethod
    def tearDownClass(cls):
        if cls.run_test_server:
            if cls.server and cls.server.returncode is None:
                cls.server.kill()
                cls.sink.close()

    def setUp(self):
        if not self.run_test_server:
            self.index = PackageIndex()
        else:
            self.index = PackageIndex(self.test_server_url)
            self.index.username = 'test'
            self.index.password = 'secret'

    def load_package_metadata(self, path):
        result = None
        for bn in (METADATA_FILENAME, 'package.json'):
            fn = os.path.join(path, bn)
            if os.path.exists(fn):
                with codecs.open(fn, 'r', 'utf-8') as jf:
                    result = json.load(jf)
                    break
        if not result:
            raise ValueError('neither %s nor package.json '
                             'found in %s' % (METADATA_FILENAME, fn))
        if bn == 'package.json':
            result = result.get('index-metadata', {})
        if result.get('metadata_version') != '2.0':
            raise ValueError('Not a valid file: %s' % fn)
        return result

    def check_pypi_server_available(self):
        if self.run_test_server and not self.server:    # pragma: no cover
            raise unittest.SkipTest('test server not available')

    def check_testdist_available(self):
        self.index.check_credentials()
        self.username = self.index.username.replace('-', '_')
        self.dist_project = '%s_testdist' % self.username
        self.dist_version = '0.1'
        self.testdir = '%s-%s' % (self.dist_project, self.dist_version)
        destdir = os.path.join(HERE, self.testdir)
        if not os.path.isdir(destdir):  # pragma: no cover
            srcdir = os.path.join(HERE, 'testdist-0.1')
            shutil.copytree(srcdir, destdir)
            for fn in os.listdir(destdir):
                fn = os.path.join(destdir, fn)
                if os.path.isfile(fn):
                    with codecs.open(fn, 'r', 'utf-8') as f:
                        data = f.read()
                    data = data.format(username=self.username)
                    with codecs.open(fn, 'w', 'utf-8') as f:
                        f.write(data)
            zip_data = zip_dir(destdir).getvalue()
            zip_name = destdir + '.zip'
            with open(zip_name, 'wb') as f:
                f.write(zip_data)

    def test_register(self):
        "Test registration"
        self.check_pypi_server_available()
        self.check_testdist_available()
        d = os.path.join(HERE, self.testdir)
        data = self.load_package_metadata(d)
        md = Metadata()
        self.assertRaises(MetadataMissingError, self.index.register, md)
        md.name = self.dist_project
        self.assertRaises(MetadataMissingError, self.index.register, md)
        md.version = data['version']
        md.summary = data['summary']
        response = self.index.register(md)
        self.assertEqual(response.code, 200)

    def remove_package(self, name, version):
        """
        Remove package. Only works with test server; PyPI would require
        some scraping to get CSRF tokens into the request.
        """
        d = {
            ':action': 'remove_pkg',
            'name': name,
            'version': version,
            'submit_remove': 'Remove',
            'submit_ok': 'OK',
        }
        self.index.check_credentials()
        request = self.index.encode_request(d.items(), [])
        try:
            response = self.index.send_request(request)
        except HTTPError as e:
            if e.getcode() != 404:
                raise

    def test_upload(self):
        "Test upload"
        self.check_pypi_server_available()
        self.check_testdist_available()
        if self.run_test_server:
            self.remove_package(self.dist_project, self.dist_version)
        d = os.path.join(HERE, self.testdir)
        data = self.load_package_metadata(d)
        md = Metadata(mapping=data)
        self.index.gpg_home = os.path.join(HERE, 'keys')
        try:
            zip_name = os.path.join(HERE, '%s.zip' % self.testdir)
            self.assertRaises(DistlibException, self.index.upload_file, md,
                              'random-' + zip_name, 'Test User', 'tuser')
            response = self.index.upload_file(md, zip_name,
                                              'Test User', 'tuser')
            self.assertEqual(response.code, 200)
            if self.run_test_server:
                fn = os.path.join(HERE, 'packages', os.path.basename(zip_name))
                self.assertTrue(os.path.exists(fn))
        except HTTPError as e:
            # Treat as success if it already exists
            if e.getcode() != 400 or 'already exists' not in e.msg:
                raise

    def test_upload_documentation(self):
        "Test upload of documentation"
        raise unittest.SkipTest('Skipped, as pythonhosted.org is being '
                                'de-emphasised and this functionality may '
                                'no longer be available')
        self.check_pypi_server_available()
        self.check_testdist_available()
        d = os.path.join(HERE, self.testdir)
        data = self.load_package_metadata(d)
        md = Metadata(mapping=data)
        d = os.path.join(d, 'doc')
        # Non-existent directory
        self.assertRaises(DistlibException, self.index.upload_documentation,
                          md, d+'-random')
        # Directory with no index.html
        self.assertRaises(DistlibException, self.index.upload_documentation,
                          md, HERE)
        response = self.index.upload_documentation(md, d)
        self.assertEqual(response.code, 200)
        if not self.run_test_server:
            url = 'http://packages.python.org/%s/' % self.dist_project
            response = urlopen(url)
            self.assertEqual(response.code, 200)
            data = response.read()
            expected = b'This is dummy documentation'
            self.assertIn(expected, data)

    def test_verify_signature(self):
        if not self.index.gpg:      # pragma: no cover
            raise unittest.SkipTest('gpg not available')
        sig_file = os.path.join(HERE, 'good.bin.asc')
        good_file = os.path.join(HERE, 'good.bin')
        bad_file = os.path.join(HERE, 'bad.bin')
        gpg = self.index.gpg
        self.index.gpg = None
        self.assertRaises(DistlibException, self.index.verify_signature,
                          sig_file, good_file)
        self.index.gpg = gpg
        # Not pointing to keycd tests
        self.assertRaises(DistlibException, self.index.verify_signature,
                          sig_file, good_file)
        self.index.gpg_home = os.path.join(HERE, 'keys')
        self.assertTrue(self.index.verify_signature(sig_file, good_file))
        self.assertFalse(self.index.verify_signature(sig_file, bad_file))

    def test_invalid(self):
        self.assertRaises(DistlibException, PackageIndex,
                          'ftp://ftp.python.org/')
        self.index.username = None
        self.assertRaises(DistlibException, self.index.check_credentials)

    @unittest.skipIf(PYPIRC is None or os.path.exists(PYPIRC),
                    'because $HOME/.pypirc is unavailable for use')
    def test_save_configuration(self):
        try:
            self.index.save_configuration()
            self.assertTrue(os.path.exists(PYPIRC))
        finally:
            os.remove(PYPIRC)

    if ssl:
        def make_https_server(self, certfile):
            server = HTTPSServerThread(certfile)
            flag = threading.Event()
            server.start(flag)
            flag.wait()
            def cleanup():
                server.stop()
                server.join()
            self.addCleanup(cleanup)
            return server

        def test_ssl_verification(self):
            certfile = os.path.join(HERE, 'keycert.pem')
            server = self.make_https_server(certfile)
            url = 'https://localhost:%d/' % server.port
            req = Request(url)
            self.index.ssl_verifier = HTTPSHandler(certfile)
            response = self.index.send_request(req)
            self.assertEqual(response.code, 200)

        def test_download(self):
            digest = '913093474942c5a564c011f232868517' # for testsrc/README.txt
            certfile = os.path.join(HERE, 'keycert.pem')
            server = self.make_https_server(certfile)
            url = 'https://localhost:%d/README.txt' % server.port
            fd, fn = tempfile.mkstemp()
            os.close(fd)
            self.addCleanup(os.remove, fn)
            with open(os.path.join(HERE, 'testsrc', 'README.txt'), 'rb') as f:
                data = f.read()
            self.index.ssl_verifier = HTTPSHandler(certfile)
            self.index.download_file(url, fn)   # no digest
            with open(fn, 'rb') as f:
                self.assertEqual(data, f.read())
            self.index.download_file(url, fn, digest)
            with open(fn, 'rb') as f:
                self.assertEqual(data, f.read())
            reporthook = lambda *args: None
            self.index.download_file(url, fn, ('md5', digest), reporthook)
            with open(fn, 'rb') as f:
                self.assertEqual(data, f.read())
            # bad digest
            self.assertRaises(DistlibException, self.index.download_file, url, fn,
                              digest[:-1] + '8')

    @unittest.skipIf('SKIP_ONLINE' in os.environ, 'Skipping online test')
    @unittest.skipUnless(ssl, 'SSL required for this test.')
    def test_search(self):
        self.index = PackageIndex()
        result = self.index.search({'name': 'tatterdema'})
        self.assertEqual(len(result), 1)
        result = self.index.search({'name': 'ragamuff'})
        self.assertEqual(len(result), 0)


if __name__ == '__main__':  # pragma: no cover
    unittest.main()