from logilab.common.testlib import TestCase, unittest_main, tag, Tags

from cubicweb.web import StatusResponse

from cubicweb.devtools.fake import FakeRequest

def _test_cache(hin, hout, method='GET'):

    """forge and process a request

    return status code and the request object

    status is None is no cache is involved

    """

    # forge request

    req = FakeRequest(method=method)

    for key, value in hin:

        req._headers_in.addRawHeader(key, str(value))

    for key, value in hout:

        req.headers_out.addRawHeader(key, str(value))

    # process

    status = None

    try:

        req.validate_cache()

    except StatusResponse as ex:

        status = ex.status

    return status, req

class HTTPCache(TestCase):

    """Check that the http cache logiac work as expected

    (as far as we understood the RFC)

    """

    tags = TestCase.tags | Tags('http', 'cache')

    def assertCache(self, expected, status, situation=''):

        """simple assert for nicer message"""

        if expected != status:

            if expected is None:

                expected = "MODIFIED"

            if status is None:

                status = "MODIFIED"

            msg = 'expected %r got %r' % (expected, status)

            if situation:

                msg = "%s - when: %s" % (msg, situation)

            self.fail(msg)

    def test_IN_none_OUT_none(self):

        #: test that no caching is requested when not data is available

        #: on any side

        status, req =_test_cache((),())

        self.assertIsNone(status)

    def test_IN_Some_OUT_none(self):

        #: test that no caching is requested when no data is available

        #: server (origin) side

        hin = [('if-modified-since','Sat, 14 Apr 2012 14:39:32 GM'),

              ]

        status, req = _test_cache(hin, ())

        self.assertIsNone(status)

        hin = [('if-none-match','babar/huitre'),

              ]

        status, req = _test_cache(hin, ())

        self.assertIsNone(status)

        hin = [('if-modified-since','Sat, 14 Apr 2012 14:39:32 GM'),

               ('if-none-match','babar/huitre'),

              ]

        status, req = _test_cache(hin, ())

        self.assertIsNone(status)

    def test_IN_none_OUT_Some(self):

        #: test that no caching is requested when no data is provided

        #: by the client

        hout = [('last-modified','Sat, 14 Apr 2012 14:39:32 GM'),

               ]

        status, req = _test_cache((), hout)

        self.assertIsNone(status)

        hout = [('etag','babar/huitre'),

               ]

        status, req = _test_cache((), hout)

        self.assertIsNone(status)

        hout = [('last-modified', 'Sat, 14 Apr 2012 14:39:32 GM'),

                ('etag','babar/huitre'),

               ]

        status, req = _test_cache((), hout)

        self.assertIsNone(status)

    @tag('last_modified')

    def test_last_modified_newer(self):

        #: test the proper behavior of modification date only

        # newer

        hin  = [('if-modified-since', 'Sat, 13 Apr 2012 14:39:32 GM'),

               ]

        hout = [('last-modified', 'Sat, 14 Apr 2012 14:39:32 GM'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(None, status, 'origin is newer than client')

    @tag('last_modified')

    def test_last_modified_older(self):

        # older

        hin  = [('if-modified-since', 'Sat, 15 Apr 2012 14:39:32 GM'),

               ]

        hout = [('last-modified', 'Sat, 14 Apr 2012 14:39:32 GM'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(304, status, 'origin is older than client')

    @tag('last_modified')

    def test_last_modified_same(self):

        # same

        hin  = [('if-modified-since', 'Sat, 14 Apr 2012 14:39:32 GM'),

               ]

        hout = [('last-modified', 'Sat, 14 Apr 2012 14:39:32 GM'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(304, status, 'origin is equal to client')

    @tag('etag')

    def test_etag_mismatch(self):

        #: test the proper behavior of etag only

        # etag mismatch

        hin  = [('if-none-match', 'babar'),

               ]

        hout = [('etag', 'celestine'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(None, status, 'etag mismatch')

    @tag('etag')

    def test_etag_match(self):

        # etag match

        hin  = [('if-none-match', 'babar'),

               ]

        hout = [('etag', 'babar'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(304, status, 'etag match')

        # etag match in multiple

        hin  = [('if-none-match', 'loutre'),

                ('if-none-match', 'babar'),

               ]

        hout = [('etag', 'babar'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(304, status, 'etag match in multiple')

        # client use "*" as etag

        hin  = [('if-none-match', '*'),

               ]

        hout = [('etag', 'babar'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(304, status, 'client use "*" as etag')

    @tag('etag', 'last_modified')

    def test_both(self):

        #: test the proper behavior of etag only

        # both wrong

        hin  = [('if-none-match', 'babar'),

                ('if-modified-since', 'Sat, 14 Apr 2012 14:39:32 GM'),

               ]

        hout = [('etag', 'loutre'),

                ('last-modified', 'Sat, 15 Apr 2012 14:39:32 GM'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(None, status, 'both wrong')

    @tag('etag', 'last_modified')

    def test_both_etag_mismatch(self):

        # both etag mismatch

        hin  = [('if-none-match', 'babar'),

                ('if-modified-since', 'Sat, 14 Apr 2012 14:39:32 GM'),

               ]

        hout = [('etag', 'loutre'),

                ('last-modified', 'Sat, 13 Apr 2012 14:39:32 GM'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(None, status, 'both  but etag mismatch')

    @tag('etag', 'last_modified')

    def test_both_but_modified(self):

        # both but modified

        hin  = [('if-none-match', 'babar'),

                ('if-modified-since', 'Sat, 14 Apr 2012 14:39:32 GM'),

               ]

        hout = [('etag', 'babar'),

                ('last-modified', 'Sat, 15 Apr 2012 14:39:32 GM'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(None, status, 'both  but modified')

    @tag('etag', 'last_modified')

    def test_both_ok(self):

        # both ok

        hin  = [('if-none-match', 'babar'),

                ('if-modified-since', 'Sat, 14 Apr 2012 14:39:32 GM'),

               ]

        hout = [('etag', 'babar'),

                ('last-modified', 'Sat, 13 Apr 2012 14:39:32 GM'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(304, status, 'both ok')

    @tag('etag', 'HEAD')

    def test_head_verb(self):

        #: check than FOUND 200 is properly raise without content on HEAD request

        #: This logic does not really belong here :-/

        # modified

        hin  = [('if-none-match', 'babar'),

               ]

        hout = [('etag', 'rhino/really-not-babar'),

               ]

        status, req = _test_cache(hin, hout, method='HEAD')

        self.assertCache(200, status, 'modifier HEAD verb')

        # not modified

        hin  = [('if-none-match', 'babar'),

               ]

        hout = [('etag', 'babar'),

               ]

        status, req = _test_cache(hin, hout, method='HEAD')

        self.assertCache(304, status, 'not modifier HEAD verb')

    @tag('etag', 'POST')

    def test_post_verb(self):

        # modified

        hin  = [('if-none-match', 'babar'),

               ]

        hout = [('etag', 'rhino/really-not-babar'),

               ]

        status, req = _test_cache(hin, hout, method='POST')

        self.assertCache(None, status, 'modifier HEAD verb')

        # not modified

        hin  = [('if-none-match', 'babar'),

               ]

        hout = [('etag', 'babar'),

               ]

        status, req = _test_cache(hin, hout, method='POST')

        self.assertCache(412, status, 'not modifier HEAD verb')

    @tag('expires')

    def test_expires_added(self):

        #: Check that Expires header is added:

        #: - when the page is modified

        #: - when none was already present

        hin  = [('if-none-match', 'babar'),

               ]

        hout = [('etag', 'rhino/really-not-babar'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(None, status, 'modifier HEAD verb')

        value = req.headers_out.getHeader('expires')

        self.assertIsNotNone(value)

    @tag('expires')

    def test_expires_not_added(self):

        #: Check that Expires header is not added if NOT-MODIFIED

        hin  = [('if-none-match', 'babar'),

               ]

        hout = [('etag', 'babar'),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(304, status, 'not modifier HEAD verb')

        value = req.headers_out.getHeader('expires')

        self.assertIsNone(value)

    @tag('expires')

    def test_expires_no_overwrite(self):

        #: Check that cache does not overwrite existing Expires header

        hin  = [('if-none-match', 'babar'),

               ]

        DATE = 'Sat, 13 Apr 2012 14:39:32 GM'

        hout = [('etag', 'rhino/really-not-babar'),

                ('expires', DATE),

               ]

        status, req = _test_cache(hin, hout)

        self.assertCache(None, status, 'not modifier HEAD verb')

        value = req.headers_out.getRawHeaders('expires')

        self.assertEqual(value, [DATE])

if __name__ == '__main__':

    unittest_main()