source: main/waeup.cas/trunk/waeup/cas/tests/test_server.py @ 11102

Last change on this file since 11102 was 10612, checked in by uli, 11 years ago

Use bootstrap 3.0 in all templates.
File size: 24.9 KB
Line 
1import os
2import re
3import shutil
4import tempfile
5import unittest
6from paste.deploy import loadapp
7try:
8    from urlparse import parse_qsl         # Python 2.x
9except ImportError:                        # pragma: no cover
10    from urllib.parse import parse_qsl     # Python 3.x
11from webob import Request, Response
12from webtest import TestApp as WebTestApp  # avoid py.test skip message
13from waeup.cas.authenticators import DummyAuthenticator
14from waeup.cas.db import DB, LoginTicket, ServiceTicket, TicketGrantingCookie
15from waeup.cas.server import (
16    CASServer, create_service_ticket, create_login_ticket,
17    create_tgc_value, check_login_ticket, set_session_cookie,
18    check_session_cookie, get_template, delete_session_cookie,
19    check_service_ticket, update_url, set_message
20    )
21
22RE_ALPHABET = re.compile('^[a-zA-Z0-9\-]*$')
23RE_COOKIE = re.compile('^cas-tgc=[A-Za-z0-9\-]+; Path=/; secure; HttpOnly$')
24RE_COOKIE_DEL = re.compile(
25    '^cas-tgc=; Max-Age=\-[0-9]+; Path=/; '
26    'expires=Thu, 01-Jan-1970 00:00:00 GMT; secure; HttpOnly$')
27
28
29class CASServerTests(unittest.TestCase):
30
31    def setUp(self):
32        # Create a new location where tempfiles are created.  This way
33        # also temporary dirs of local CASServers can be removed on
34        # tear-down.
35        self._new_tmpdir = tempfile.mkdtemp()
36        self._old_tmpdir = tempfile.tempdir
37        tempfile.tempdir = self._new_tmpdir
38        self.workdir = os.path.join(self._new_tmpdir, 'home')
39        self.db_path = os.path.join(self.workdir, 'mycas.db')
40        os.mkdir(self.workdir)
41        self.paste_conf1 = os.path.join(
42            os.path.dirname(__file__), 'sample1.ini')
43        self.paste_conf2 = os.path.join(
44            os.path.dirname(__file__), 'sample2.ini')
45
46    def tearDown(self):
47        # remove local tempfile and reset old tempdir setting
48        if os.path.isdir(self._new_tmpdir):
49            shutil.rmtree(self._new_tmpdir)
50        tempfile.tempdir = self._old_tmpdir
51
52    def test_paste_deploy_loader(self):
53        # we can load the CAS server via paste.deploy plugin
54        app = loadapp('config:%s' % self.paste_conf1)
55        assert isinstance(app, CASServer)
56        assert hasattr(app, 'db')
57        assert isinstance(app.db, DB)
58        assert hasattr(app, 'auth')
59
60    def test_paste_deploy_options(self):
61        # we can set CAS server-related options via paste.deploy config
62        app = loadapp('config:%s' % self.paste_conf2)
63        assert isinstance(app, CASServer)
64        assert app.db_connection_string == 'sqlite:///:memory:'
65        assert isinstance(app.auth, DummyAuthenticator)
66
67    def test_init(self):
68        # we get a `DB` instance created automatically
69        app = CASServer()
70        assert hasattr(app, 'db')
71        assert app.db is not None
72
73    def test_init_explicit_db_path(self):
74        # we can set a db_path explicitly
75        app = CASServer(db='sqlite:///%s' % self.db_path)
76        assert hasattr(app, 'db')
77        assert isinstance(app.db, DB)
78        assert os.path.isfile(self.db_path)
79
80    def test_get_template(self):
81        app = CASServer()
82        assert app._get_template('login.html') is not None
83        assert app._get_template('not-existent.html') is None
84        # parts of header and footer are replaced
85        assert 'PART_HEADER' not in app._get_template('login.html')
86        assert 'PART_FOOTER' not in app._get_template('login.html')
87
88    def test_call_root(self):
89        # the CAS protocol requires no root
90        app = CASServer()
91        req = Request.blank('http://localhost/')
92        resp = app(req)
93        assert resp.status == '404 Not Found'
94
95    def test_first_time_login(self):
96        # we can get a login page
97        app = CASServer()
98        req = Request.blank('http://localhost/login')
99        resp = app(req)
100        assert resp.status == '200 OK'
101
102    def test_validate(self):
103        # we can access a validation page
104        app = CASServer()
105        req = Request.blank('http://localhost/validate?service=foo&ticket=bar')
106        resp = app(req)
107        assert resp.status == '200 OK'
108
109    def test_logout(self):
110        # we can access a logout page
111        app = CASServer()
112        req = Request.blank('http://localhost/logout')
113        resp = app(req)
114        assert resp.status == '200 OK'
115
116    def test_login_simple(self):
117        # a simple login with no service will result in login screen
118        # (2.1.1#service of protocol specs)
119        app = CASServer()
120        req = Request.blank('http://localhost/login')
121        resp = app(req)
122        assert resp.status == '200 OK'
123        assert resp.content_type == 'text/html'
124        assert b'<form ' in resp.body
125
126    def test_login_cred_acceptor_sso_no_service(self):
127        # 2.2.4: successful login via single sign on
128        app = CASServer()
129        tgc = create_tgc_value()
130        app.db.add(tgc)
131        value = str(tgc.value)
132        req = Request.blank('https://localhost/login')
133        req.headers['Cookie'] = 'cas-tgc=%s' % value
134        resp = app(req)
135        assert resp.status == '200 OK'
136        assert b'already' in resp.body
137        assert 'Set-Cookie' not in resp.headers
138        return
139
140    def test_login_renew_with_cookie(self):
141        # 2.1.1: cookie will be ignored when renew is set
142        app = CASServer()
143        tgc = create_tgc_value()
144        app.db.add(tgc)
145        value = str(tgc.value)
146        req = Request.blank('https://localhost/login?renew=true')
147        req.headers['Cookie'] = 'cas-tgc=%s' % value
148        resp = app(req)
149        assert resp.status == '200 OK'
150        assert b'username' in resp.body
151        assert 'Set-Cookie' not in resp.headers
152
153    def test_login_renew_without_cookie(self):
154        # 2.1.1: with renew and no cookie, normal auth will happen
155        app = CASServer()
156        req = Request.blank('https://localhost/login?renew=true')
157        resp = app(req)
158        assert resp.status == '200 OK'
159        assert b'username' in resp.body
160
161    def test_login_renew_as_empty_string(self):
162        # `renew` is handled correctly, even with empty value
163        app = CASServer()
164        tgc = create_tgc_value()
165        app.db.add(tgc)
166        value = str(tgc.value)
167        req = Request.blank('https://localhost/login?renew')
168        req.headers['Cookie'] = 'cas-tgc=%s' % value
169        resp = app(req)
170        assert resp.status == '200 OK'
171        assert b'username' in resp.body
172        assert 'Set-Cookie' not in resp.headers
173
174    def test_login_gateway_no_cookie_with_service(self):
175        # 2.1.1: with gateway but w/o cookie we will be redirected to service
176        # no service ticket will be issued
177        app = CASServer()
178        params = 'gateway=true&service=http%3A%2F%2Fwww.service.com'
179        req = Request.blank('https://localhost/login?%s' % params)
180        resp = app(req)
181        assert resp.status == '303 See Other'
182        assert 'Location' in resp.headers
183        assert resp.headers['Location'] == 'http://www.service.com'
184
185    def test_login_gateway_with_cookie_and_service(self):
186        # 2.1.1: with cookie and gateway we will be redirected to service
187        app = CASServer()
188        tgc = create_tgc_value()
189        app.db.add(tgc)
190        value = str(tgc.value)
191        params = 'gateway=true&service=http%3A%2F%2Fwww.service.com'
192        req = Request.blank('https://localhost/login?%s' % params)
193        req.headers['Cookie'] = 'cas-tgc=%s' % value
194        resp = app(req)
195        assert resp.status == '303 See Other'
196        assert 'Location' in resp.headers
197        assert resp.headers['Location'].startswith(
198            'http://www.service.com?ticket=ST-')
199
200    def test_login_gateway_and_renew(self):
201        # 2.1.1 if both, gateway and renew are specified, only renew is valid
202        app = CASServer()
203        tgc = create_tgc_value()
204        app.db.add(tgc)
205        value = str(tgc.value)
206        req = Request.blank('https://localhost/login?renew=true&gateway=true')
207        req.headers['Cookie'] = 'cas-tgc=%s' % value
208        resp = app(req)
209        # with only gateway true, this would lead to a redirect
210        assert resp.status == '200 OK'
211        assert b'username' in resp.body
212        assert 'Set-Cookie' not in resp.headers
213
214    def test_login_warn(self):
215        # 2.2.1 as a credential acceptor, with `warn` set we require confirm
216        app = CASServer()
217        tgc = create_tgc_value()
218        app.db.add(tgc)
219        value = str(tgc.value)
220        params = 'warn=true&service=http%3A%2F%2Fwww.service.com'
221        req = Request.blank('https://localhost/login?%s' % params)
222        req.headers['Cookie'] = 'cas-tgc=%s' % value
223        resp = app(req)
224        # without warn, we would get a redirect
225        assert resp.status == '200 OK'
226        assert b'Logged in' in resp.body
227
228    def test_logout_no_cookie(self):
229        # 2.3 logout displays a logout page.
230        app = CASServer()
231        req = Request.blank('https://localhost/logout')
232        resp = app(req)
233        assert resp.status == '200 OK'
234        assert b'logged out' in resp.body
235
236    def test_logout_with_cookie(self):
237        # 2.3 logout destroys any existing SSO session
238        app = CASServer()
239        tgc = create_tgc_value()
240        app.db.add(tgc)
241        value = str(tgc.value)
242        req = Request.blank('https://localhost/logout')
243        req.headers['Cookie'] = 'cas-tgc=%s' % value
244        resp = app(req)
245        assert resp.status == '200 OK'
246        assert b'logged out' in resp.body
247        assert 'Set-Cookie' in resp.headers
248        cookie = resp.headers['Set-Cookie']
249        assert cookie.startswith('cas-tgc=;')
250        assert 'expires' in cookie
251        assert 'Max-Age' in cookie
252        assert len(list(app.db.query(TicketGrantingCookie))) == 0
253
254    def test_logout_url(self):
255        # 2.3.1 with an `url` given we provide a link on logout
256        app = CASServer()
257        params = 'url=http%3A%2F%2Fwww.logout.com'
258        req = Request.blank('https://localhost/logout?%s' % params)
259        resp = app(req)
260        assert resp.status == '200 OK'
261        assert b'logged out' in resp.body
262        assert b'like you to' in resp.body
263        assert b'http://www.logout.com' in resp.body
264
265    def test_validate_invalid(self):
266        # 2.4.2 validation failures is indicated by a given format
267        app = CASServer()
268        params = 'ticket=foo&service=bar'
269        req = Request.blank('https://localhost/validate?%s' % params)
270        resp = app(req)
271        assert resp.body == b'no\n\n'
272
273    def test_validate_valid(self):
274        # 2.4 validation success is indicated by a given format
275        app = CASServer()
276        sticket = create_service_ticket(
277            'someuser', 'http://service.com/', sso=False)
278        app.db.add(sticket)
279        params = 'ticket=%s&service=%s' % (
280            sticket.ticket, sticket.service)
281        req = Request.blank('https://localhost/validate?%s' % params)
282        resp = app(req)
283        assert resp.body == b'yes\nsomeuser\n'
284
285    def test_validate_renew_invalid(self):
286        # 2.4.1 with `renew` we accept only non-sso issued tickets
287        app = CASServer()
288        sticket = create_service_ticket(
289            'someuser', 'http://service.com/', sso=True)
290        app.db.add(sticket)
291        params = 'ticket=%s&service=%s&renew=true' % (
292            sticket.ticket, sticket.service)
293        req = Request.blank('https://localhost/validate?%s' % params)
294        resp = app(req)
295        assert resp.body == b'no\n\n'
296
297    def test_validate_renew_valid(self):
298        # 2.4.1 with `renew` we accept only non-sso issued tickets
299        app = CASServer()
300        sticket = create_service_ticket(
301            'someuser', 'http://service.com/', sso=False)
302        app.db.add(sticket)
303        params = 'ticket=%s&service=%s&renew=true' % (
304            sticket.ticket, sticket.service)
305        req = Request.blank('https://localhost/validate?%s' % params)
306        resp = app(req)
307        assert resp.body == b'yes\nsomeuser\n'
308
309    def test_style_css(self):
310        # we can get a custom style sheet
311        app = CASServer()
312        req = Request.blank('https://localhost/style.css')
313        resp = app(req)
314        assert resp.status == '200 OK'
315        assert resp.content_type == 'text/css'
316
317    def test_set_message(self):
318        # we can set a message
319        result = set_message('Hi there', '<body>MSG_TEXT</body>')
320        assert result == '<body>Hi there</body>'
321
322    def test_set_message_empty_or_none(self):
323        # without a message, no message text will be displayed
324        result = set_message('', '<body>MSG_TEXT</body>')
325        assert result == '<body></body>'
326        result = set_message('', '<body><div id="msg">MSG_TEXT</div></body>')
327        assert result == '<body></body>'
328        result = set_message(None, '<body><div id="msg">MSG_TEXT</div></body>')
329        assert result == '<body></body>'
330        result = set_message(
331            None,
332            '<body><div a="1">\n<div id="msg">MSG_TEXT</div>a\n</div></body>')
333        assert result == '<body><div a="1">\na\n</div></body>'
334        result = set_message(
335            None,
336            '<body><div a="1"><div id="msg">MSG_TEXT</div>a</div></body>')
337        assert result == '<body><div a="1">a</div></body>'
338
339
340class BrowserTests(unittest.TestCase):
341
342    def setUp(self):
343        self.raw_app = CASServer(auth=DummyAuthenticator())
344        self.app = WebTestApp(self.raw_app)
345
346    def test_login(self):
347        resp = self.app.get('/login')
348        assert resp.status == '200 OK'
349        form = resp.forms[0]
350        # 2.1.3: form must be submitted by POST
351        assert form.method == 'post'
352        fieldnames = form.fields.keys()
353        # 2.1.3: form must contain: username, password, lt
354        assert 'username' in fieldnames
355        assert 'password' in fieldnames
356        assert 'lt' in fieldnames
357        assert RE_ALPHABET.match(form['lt'].value)
358
359    def test_login_no_service(self):
360        # w/o a service passed in, the form should not contain service
361        # (not a strict protocol requirement, but handy)
362        resp = self.app.get('/login')
363        assert 'service' not in resp.forms[0].fields.keys()
364
365    def test_login_service_replayed(self):
366        # 2.1.3: the login form must contain the service param sent
367        resp = self.app.get('/login?service=http%3A%2F%2Fwww.service.com')
368        form = resp.forms[0]
369        assert resp.status == '200 OK'
370        assert 'service' in form.fields.keys()
371        assert form['service'].value == 'http://www.service.com'
372
373    def test_login_cred_acceptor_valid_no_service(self):
374        # 2.2.4: successful login w/o service yields a message
375        lt = create_login_ticket()
376        self.raw_app.db.add(lt)
377        lt_string = lt.ticket
378        resp = self.app.post('/login', dict(
379            username='bird', password='bebop', lt=lt_string))
380        assert resp.status == '200 OK'
381        assert b'successful' in resp.body
382        # single-sign-on session initiated
383        assert 'Set-Cookie' in resp.headers
384        cookie = resp.headers['Set-Cookie']
385        assert cookie.startswith('cas-tgc=')
386
387    def test_login_cred_acceptor_valid_w_service(self):
388        # 2.2.4: successful login with service makes a redirect
389        # Appendix B: safe redirect
390        lt = create_login_ticket()
391        self.raw_app.db.add(lt)
392        lt_string = lt.ticket
393        resp = self.app.post('/login', dict(
394            username='bird', password='bebop', lt=lt_string,
395            service='http://example.com/Login'))
396        assert resp.status == '303 See Other'
397        assert 'Location' in resp.headers
398        assert resp.headers['Location'].startswith(
399            'http://example.com/Login?ticket=ST-')
400        assert 'Pragma' in resp.headers
401        assert resp.headers['Pragma'] == 'no-cache'
402        assert 'Cache-Control' in resp.headers
403        assert resp.headers['Cache-Control'] == 'no-store'
404        assert 'Expires' in resp.headers
405        assert resp.headers['Expires'] == 'Thu, 01 Dec 1994 16:00:00 GMT'
406        assert b'window.location.href' in resp.body
407        assert b'noscript' in resp.body
408        assert b'ticket=ST-' in resp.body
409        q = self.raw_app.db.query(ServiceTicket)
410        st = q.all()[0]
411        assert st.user == 'bird'
412        assert st.service == 'http://example.com/Login'
413        assert st.ticket.startswith('ST-')
414
415    def test_login_cred_acceptor_failed(self):
416        # 2.2.4: failed login yields a message
417        lt = create_login_ticket()
418        self.raw_app.db.add(lt)
419        lt_string = lt.ticket
420        resp = self.app.post('/login', dict(
421            username='bird', password='cat', lt=lt_string))
422        assert resp.status == '200 OK'
423        assert b'failed' in resp.body
424
425    def test_login_sso_no_service(self):
426        # we can initiate single-sign-on without service
427        resp1 = self.app.get('https://localhost/login')  # HTTPS required!
428        assert resp1.status == '200 OK'
429        assert 'cas-tgc' not in self.app.cookies
430        form = resp1.forms[0]
431        form.set('username', 'bird')
432        form.set('password', 'bebop')
433        resp2 = form.submit('AUTHENTICATE')
434        assert resp2.status == '200 OK'
435        # we got a secure cookie
436        assert 'cas-tgc' in self.app.cookies
437        # when we get the login page again, the cookie will replace creds.
438        resp3 = self.app.get('https://localhost/login')
439        assert b'You logged in already' in resp3.body
440
441    def test_login_sso_with_service(self):
442        resp1 = self.app.get(
443            'https://localhost/login?service=http%3A%2F%2Fservice.com%2F')
444        assert resp1.status == '200 OK'
445        assert 'cas-tgc' not in self.app.cookies
446        form = resp1.forms[0]
447        form.set('username', 'bird')
448        form.set('password', 'bebop')
449        resp2 = form.submit('AUTHENTICATE')
450        assert resp2.status == '303 See Other'
451        assert resp2.headers['Location'].startswith(
452            'http://service.com/?ticket=ST-')
453        # we got a secure cookie
454        assert 'cas-tgc' in self.app.cookies
455        resp3 = self.app.get(
456            'https://localhost/login?service=http%3A%2F%2Fservice.com%2F')
457        assert resp3.status == '303 See Other'
458        assert resp3.headers['Location'].startswith(
459            'http://service.com/?ticket=ST-')
460
461    def test_login_sso_with_service_additional_params1(self):
462        # we can get a service ticket also with a service providing
463        # get params
464        # this service url reads http://service.com/index.php?authCAS=CAS
465        service_url = 'http%3A%2F%2Fservice.com%2Findex.php%3FauthCAS%3DCAS'
466        resp1 = self.app.get(
467            'https://localhost/login?service=%s' % service_url)
468        assert resp1.status == '200 OK'
469        assert 'cas-tgc' not in self.app.cookies
470        form = resp1.forms[0]
471        form.set('username', 'bird')
472        form.set('password', 'bebop')
473        resp2 = form.submit('AUTHENTICATE')
474        assert resp2.status == '303 See Other'
475        location = resp2.headers['Location']
476        query_string = location.split('?', 1)[1]
477        query_params = dict(parse_qsl(query_string))
478        assert 'authCAS' in query_params.keys()
479        assert 'ticket' in query_params.keys()
480        assert len(query_params['ticket']) == 32
481
482
483class CASServerHelperTests(unittest.TestCase):
484
485    def setUp(self):
486        self.workdir = tempfile.mkdtemp()
487        self.db_file = os.path.join(self.workdir, 'mycas.db')
488        self.conn_string = 'sqlite:///%s' % self.db_file
489        self.db = DB(self.conn_string)
490
491    def tearDown(self):
492        shutil.rmtree(self.workdir)
493
494    def test_create_service_ticket(self):
495        # we can create service tickets
496        st = create_service_ticket(
497            user='bob', service='http://www.example.com')
498        assert isinstance(st, ServiceTicket)
499        # 3.1.1: service not part of ticket
500        assert 'example.com' not in st.ticket
501        # 3.1.1: ticket must start with 'ST-'
502        assert st.ticket.startswith('ST-')
503        # 3.1.1: min. ticket length clients must be able to process is 32
504        assert len(st.ticket) < 33
505        # 3.7: allowed character set == [a-zA-Z0-9\-]
506        assert RE_ALPHABET.match(st.ticket), (
507            'Ticket contains forbidden chars: %s' % st)
508        assert st.service == 'http://www.example.com'
509        assert st.user == 'bob'
510
511    def test_create_login_ticket(self):
512        # we can create login tickets
513        lt = create_login_ticket()
514        # 3.5.1: ticket should start with 'LT-'
515        assert lt.ticket.startswith('LT-')
516        # 3.7: allowed character set == [a-zA-Z0-9\-]
517        assert RE_ALPHABET.match(lt.ticket), (
518            'Ticket contains forbidden chars: %s' % lt)
519
520    def test_create_login_ticket_unique(self):
521        # 3.5.1: login tickets are unique (although not hard to guess)
522        ticket_num = 1000  # increase to test more thoroughly
523        lt_list = [create_login_ticket() for x in range(ticket_num)]
524        assert len(set(lt_list)) == ticket_num
525
526    def test_create_tgc_value(self):
527        # we can create ticket granting cookies
528        tgc = create_tgc_value()
529        assert isinstance(tgc, TicketGrantingCookie)
530        # 3.6.1: cookie value should start with 'TGC-'
531        assert tgc.value.startswith('TGC-')
532        # 3.7: allowed character set == [a-zA-Z0-9\-]
533        assert RE_ALPHABET.match(tgc.value), (
534            'Cookie value contains forbidden chars: %s' % tgc)
535
536    def test_check_login_ticket(self):
537        db = DB('sqlite:///')
538        lt = LoginTicket('LT-123456')
539        db.add(lt)
540        assert check_login_ticket(db, None) is False
541        assert check_login_ticket(db, 'LT-123456') is True
542        # the ticket will be removed after check
543        assert check_login_ticket(db, 'LT-123456') is False
544        assert check_login_ticket(db, 'LT-654321') is False
545
546    def test_set_session_cookie1(self):
547        # make sure we can add session cookies to responses
548        db = DB('sqlite:///')
549        resp = set_session_cookie(db, Response())
550        assert 'Set-Cookie' in resp.headers
551        cookie = resp.headers['Set-Cookie']
552        assert RE_COOKIE.match(cookie), (
553            'Cookie in unexpected format: %s' % cookie)
554        # the cookie is stored in database
555        value = cookie.split('=')[1].split(';')[0]
556        q = db.query(TicketGrantingCookie).filter(
557            TicketGrantingCookie.value == value)
558        assert len(list(q)) == 1
559
560    def test_check_session_cookie2(self):
561        db = DB('sqlite:///')
562        tgc = create_tgc_value()
563        db.add(tgc)
564        value = tgc.value
565        assert check_session_cookie(db, value) == tgc
566        assert check_session_cookie(db, 'foo') is None
567        assert check_session_cookie(db, b'foo') is None
568        assert check_session_cookie(db, None) is None
569        value2 = value.encode('utf-8')
570        assert check_session_cookie(db, value2) == tgc
571
572    def test_get_template(self):
573        # we can load templates
574        assert get_template('not-existing-template') is None
575        assert get_template('login.html') is not None
576        # parts of header and footer are replaced
577        assert 'PART_HEADER' not in get_template('login.html')
578        assert 'PART_FOOTER' not in get_template('login.html')
579
580    def test_delete_session_cookie(self):
581        # we can unset cookies
582        db = DB('sqlite:///')
583        tgc = create_tgc_value()
584        db.add(tgc)
585        value = tgc.value
586        resp = delete_session_cookie(db, Response(), old_value=value)
587        assert 'Set-Cookie' in resp.headers
588        cookie = resp.headers['Set-Cookie']
589        assert RE_COOKIE_DEL.match(cookie), (
590            'Cookie in unexpected format: %s' % cookie)
591        # the cookie values was deleted from database
592        q = db.query(TicketGrantingCookie).filter(
593            TicketGrantingCookie.value == value)
594        assert len(list(q)) == 0
595
596    def test_check_service_ticket(self):
597        db = DB('sqlite:///')
598        st = ServiceTicket(
599            'ST-123456', 'someuser', 'http://myservice.com', True)
600        db.add(st)
601        assert check_service_ticket(db, None, 'foo') is None
602        assert check_service_ticket(db, 'foo', None) is None
603        assert check_service_ticket(db, 'ST-123456', 'foo') is None
604        assert check_service_ticket(db, 'foo', 'http://myservice.com') is None
605        result = check_service_ticket(db, 'ST-123456', 'http://myservice.com')
606        assert isinstance(result, ServiceTicket)
607        assert result.user == 'someuser'
608        assert check_service_ticket(
609            db,  'ST-123456', 'http://myservice.com', True) is None
610        assert check_service_ticket(
611            db,  'ST-123456', 'http://myservice.com', False) is not None
612
613    def test_update_url(self):
614        # we can create valid new urls with query string params updated
615        result1 = update_url('http://sample.com/index?a=1&b=2', dict(b='3'))
616        assert result1 in (
617            'http://sample.com/index?a=1&b=3',
618            'http://sample.com/index?b=3&a=1')
619        result2 = update_url('http://sample.com/index?b=2', dict(b='3'))
620        assert result2 == 'http://sample.com/index?b=3'
621        result3 = update_url('http://sample.com/index', dict(b='3'))
622        assert result3 == 'http://sample.com/index?b=3'
623        result4 = update_url('http://sample.com/index?a=2', dict(b='3'))
624        assert result4 in (
625            'http://sample.com/index?a=2&b=3',
626            'http://sample.com/index?b=3&a=2')
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