import errno
from http import client
import io
import socket

from unittest import TestCase

from test import support

HOST = support.HOST

class FakeSocket:
    def __init__(self, text, fileclass=io.BytesIO):
        if isinstance(text, str):
            text = text.encode("ascii")
        self.text = text
        self.fileclass = fileclass
        self.data = b''

    def sendall(self, data):
        self.data += data

    def makefile(self, mode, bufsize=None):
        if mode != 'r' and mode != 'rb':
            raise client.UnimplementedFileMode()
        return self.fileclass(self.text)

class EPipeSocket(FakeSocket):

    def __init__(self, text, pipe_trigger):
        # When sendall() is called with pipe_trigger, raise EPIPE.
        FakeSocket.__init__(self, text)
        self.pipe_trigger = pipe_trigger

    def sendall(self, data):
        if self.pipe_trigger in data:
            raise socket.error(errno.EPIPE, "gotcha")
        self.data += data

    def close(self):
        pass

class NoEOFStringIO(io.BytesIO):
    """Like StringIO, but raises AssertionError on EOF.

    This is used below to test that http.client doesn't try to read
    more from the underlying file than it should.
    """
    def read(self, n=-1):
        data = io.BytesIO.read(self, n)
        if data == b'':
            raise AssertionError('caller tried to read past EOF')
        return data

    def readline(self, length=None):
        data = io.BytesIO.readline(self, length)
        if data == b'':
            raise AssertionError('caller tried to read past EOF')
        return data

class HeaderTests(TestCase):
    def test_auto_headers(self):
        # Some headers are added automatically, but should not be added by
        # .request() if they are explicitly set.

        class HeaderCountingBuffer(list):
            def __init__(self):
                self.count = {}
            def append(self, item):
                kv = item.split(b':')
                if len(kv) > 1:
                    # item is a 'Key: Value' header string
                    lcKey = kv[0].decode('ascii').lower()
                    self.count.setdefault(lcKey, 0)
                    self.count[lcKey] += 1
                list.append(self, item)

        for explicit_header in True, False:
            for header in 'Content-length', 'Host', 'Accept-encoding':
                conn = client.HTTPConnection('example.com')
                conn.sock = FakeSocket('blahblahblah')
                conn._buffer = HeaderCountingBuffer()

                body = 'spamspamspam'
                headers = {}
                if explicit_header:
                    headers[header] = str(len(body))
                conn.request('POST', '/', body, headers)
                self.assertEqual(conn._buffer.count[header.lower()], 1)

class BasicTest(TestCase):
    def test_status_lines(self):
        # Test HTTP status lines

        body = "HTTP/1.1 200 Ok\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        self.assertEqual(resp.read(), b"Text")
        self.assertTrue(resp.isclosed())

        body = "HTTP/1.1 400.100 Not Ok\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        self.assertRaises(client.BadStatusLine, resp.begin)

    def test_partial_reads(self):
        # if we have a lenght, the system knows when to close itself
        # same behaviour than when we read the whole thing with read()
        body = "HTTP/1.1 200 Ok\r\nContent-Length: 4\r\n\r\nText"
        sock = FakeSocket(body)
        resp = client.HTTPResponse(sock)
        resp.begin()
        self.assertEqual(resp.read(2), b'Te')
        self.assertFalse(resp.isclosed())
        self.assertEqual(resp.read(2), b'xt')
        self.assertTrue(resp.isclosed())

    def test_host_port(self):
        # Check invalid host_port

        for hp in ("www.python.org:abc", "www.python.org:"):
            self.assertRaises(client.InvalidURL, client.HTTPConnection, hp)

        for hp, h, p in (("[fe80::207:e9ff:fe9b]:8000",
                          "fe80::207:e9ff:fe9b", 8000),
                         ("www.python.org:80", "www.python.org", 80),
                         ("www.python.org", "www.python.org", 80),
                         ("[fe80::207:e9ff:fe9b]", "fe80::207:e9ff:fe9b", 80)):
            c = client.HTTPConnection(hp)
            self.assertEqual(h, c.host)
            self.assertEqual(p, c.port)

    def test_response_headers(self):
        # test response with multiple message headers with the same field name.
        text = ('HTTP/1.1 200 OK\r\n'
                'Set-Cookie: Customer="WILE_E_COYOTE"; '
                'Version="1"; Path="/acme"\r\n'
                'Set-Cookie: Part_Number="Rocket_Launcher_0001"; Version="1";'
                ' Path="/acme"\r\n'
                '\r\n'
                'No body\r\n')
        hdr = ('Customer="WILE_E_COYOTE"; Version="1"; Path="/acme"'
               ', '
               'Part_Number="Rocket_Launcher_0001"; Version="1"; Path="/acme"')
        s = FakeSocket(text)
        r = client.HTTPResponse(s)
        r.begin()
        cookies = r.getheader("Set-Cookie")
        self.assertEqual(cookies, hdr)

    def test_read_head(self):
        # Test that the library doesn't attempt to read any data
        # from a HEAD request.  (Tickles SF bug #622042.)
        sock = FakeSocket(
            'HTTP/1.1 200 OK\r\n'
            'Content-Length: 14432\r\n'
            '\r\n',
            NoEOFStringIO)
        resp = client.HTTPResponse(sock, method="HEAD")
        resp.begin()
        if resp.read():
            self.fail("Did not expect response from HEAD request")

    def test_send_file(self):
        expected = (b'GET /foo HTTP/1.1\r\nHost: example.com\r\n'
                    b'Accept-Encoding: identity\r\nContent-Length:')

        body = open(__file__, 'rb')
        conn = client.HTTPConnection('example.com')
        sock = FakeSocket(body)
        conn.sock = sock
        conn.request('GET', '/foo', body)
        self.assertTrue(sock.data.startswith(expected), '%r != %r' %
                (sock.data[:len(expected)], expected))

    def test_chunked(self):
        chunked_start = (
            'HTTP/1.1 200 OK\r\n'
            'Transfer-Encoding: chunked\r\n\r\n'
            'a\r\n'
            'hello worl\r\n'
            '1\r\n'
            'd\r\n'
        )
        sock = FakeSocket(chunked_start + '0\r\n')
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEquals(resp.read(), b'hello world')
        resp.close()

        for x in ('', 'foo\r\n'):
            sock = FakeSocket(chunked_start + x)
            resp = client.HTTPResponse(sock, method="GET")
            resp.begin()
            try:
                resp.read()
            except client.IncompleteRead as i:
                self.assertEquals(i.partial, b'hello world')
                self.assertEqual(repr(i),'IncompleteRead(11 bytes read)')
                self.assertEqual(str(i),'IncompleteRead(11 bytes read)')
            else:
                self.fail('IncompleteRead expected')
            finally:
                resp.close()

    def test_negative_content_length(self):
        sock = FakeSocket(
            'HTTP/1.1 200 OK\r\nContent-Length: -1\r\n\r\nHello\r\n')
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        self.assertEquals(resp.read(), b'Hello\r\n')
        resp.close()

    def test_incomplete_read(self):
        sock = FakeSocket('HTTP/1.1 200 OK\r\nContent-Length: 10\r\n\r\nHello\r\n')
        resp = client.HTTPResponse(sock, method="GET")
        resp.begin()
        try:
            resp.read()
        except client.IncompleteRead as i:
            self.assertEquals(i.partial, b'Hello\r\n')
            self.assertEqual(repr(i),
                             "IncompleteRead(7 bytes read, 3 more expected)")
            self.assertEqual(str(i),
                             "IncompleteRead(7 bytes read, 3 more expected)")
        else:
            self.fail('IncompleteRead expected')
        finally:
            resp.close()

    def test_epipe(self):
        sock = EPipeSocket(
            "HTTP/1.0 401 Authorization Required\r\n"
            "Content-type: text/html\r\n"
            "WWW-Authenticate: Basic realm=\"example\"\r\n",
            b"Content-Length")
        conn = client.HTTPConnection("example.com")
        conn.sock = sock
        self.assertRaises(socket.error,
                          lambda: conn.request("PUT", "/url", "body"))
        resp = conn.getresponse()
        self.assertEqual(401, resp.status)
        self.assertEqual("Basic realm=\"example\"",
                         resp.getheader("www-authenticate"))

class OfflineTest(TestCase):
    def test_responses(self):
        self.assertEquals(client.responses[client.NOT_FOUND], "Not Found")

class TimeoutTest(TestCase):
    PORT = None

    def setUp(self):
        self.serv = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        TimeoutTest.PORT = support.bind_port(self.serv)
        self.serv.listen(5)

    def tearDown(self):
        self.serv.close()
        self.serv = None

    def testTimeoutAttribute(self):
        # This will prove that the timeout gets through HTTPConnection
        # and into the socket.

        # default -- use global socket timeout
        self.assert_(socket.getdefaulttimeout() is None)
        socket.setdefaulttimeout(30)
        try:
            httpConn = client.HTTPConnection(HOST, TimeoutTest.PORT)
            httpConn.connect()
        finally:
            socket.setdefaulttimeout(None)
        self.assertEqual(httpConn.sock.gettimeout(), 30)
        httpConn.close()

        # no timeout -- do not use global socket default
        self.assert_(socket.getdefaulttimeout() is None)
        socket.setdefaulttimeout(30)
        try:
            httpConn = client.HTTPConnection(HOST, TimeoutTest.PORT,
                                              timeout=None)
            httpConn.connect()
        finally:
            socket.setdefaulttimeout(None)
        self.assertEqual(httpConn.sock.gettimeout(), None)
        httpConn.close()

        # a value
        httpConn = client.HTTPConnection(HOST, TimeoutTest.PORT, timeout=30)
        httpConn.connect()
        self.assertEqual(httpConn.sock.gettimeout(), 30)
        httpConn.close()

class HTTPSTimeoutTest(TestCase):
# XXX Here should be tests for HTTPS, there isn't any right now!

    def test_attributes(self):
        # simple test to check it's storing it
        if hasattr(client, 'HTTPSConnection'):
            h = client.HTTPSConnection(HOST, TimeoutTest.PORT, timeout=30)
            self.assertEqual(h.timeout, 30)

class RequestBodyTest(TestCase):
    """Test cases where a request includes a message body."""

    def setUp(self):
        self.conn = client.HTTPConnection('example.com')
        self.conn.sock = self.sock = FakeSocket("")
        self.conn.sock = self.sock

    def get_headers_and_fp(self):
        f = io.BytesIO(self.sock.data)
        f.readline()  # read the request line
        message = client.parse_headers(f)
        return message, f

    def test_manual_content_length(self):
        # Set an incorrect content-length so that we can verify that
        # it will not be over-ridden by the library.
        self.conn.request("PUT", "/url", "body",
                          {"Content-Length": "42"})
        message, f = self.get_headers_and_fp()
        self.assertEqual("42", message.get("content-length"))
        self.assertEqual(4, len(f.read()))

    def test_ascii_body(self):
        self.conn.request("PUT", "/url", "body")
        message, f = self.get_headers_and_fp()
        self.assertEqual("text/plain", message.get_content_type())
        self.assertEqual(None, message.get_charset())
        self.assertEqual("4", message.get("content-length"))
        self.assertEqual(b'body', f.read())

    def test_latin1_body(self):
        self.conn.request("PUT", "/url", "body\xc1")
        message, f = self.get_headers_and_fp()
        self.assertEqual("text/plain", message.get_content_type())
        self.assertEqual(None, message.get_charset())
        self.assertEqual("5", message.get("content-length"))
        self.assertEqual(b'body\xc1', f.read())

    def test_bytes_body(self):
        self.conn.request("PUT", "/url", b"body\xc1")
        message, f = self.get_headers_and_fp()
        self.assertEqual("text/plain", message.get_content_type())
        self.assertEqual(None, message.get_charset())
        self.assertEqual("5", message.get("content-length"))
        self.assertEqual(b'body\xc1', f.read())

    def test_file_body(self):
        f = open(support.TESTFN, "w")
        f.write("body")
        f.close()
        f = open(support.TESTFN)
        self.conn.request("PUT", "/url", f)
        message, f = self.get_headers_and_fp()
        self.assertEqual("text/plain", message.get_content_type())
        self.assertEqual(None, message.get_charset())
        self.assertEqual("4", message.get("content-length"))
        self.assertEqual(b'body', f.read())

    def test_binary_file_body(self):
        f = open(support.TESTFN, "wb")
        f.write(b"body\xc1")
        f.close()
        f = open(support.TESTFN, "rb")
        self.conn.request("PUT", "/url", f)
        message, f = self.get_headers_and_fp()
        self.assertEqual("text/plain", message.get_content_type())
        self.assertEqual(None, message.get_charset())
        self.assertEqual("5", message.get("content-length"))
        self.assertEqual(b'body\xc1', f.read())

def test_main(verbose=None):
    support.run_unittest(HeaderTests, OfflineTest, BasicTest, TimeoutTest,
                         HTTPSTimeoutTest, RequestBodyTest)

if __name__ == '__main__':
    test_main()