Fixed #13275 -- Modified the parsing logic of the {% url %} tag to avoid catastrophic backtracking. Thanks to SmileyChris for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12943 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Russell Keith-Magee 2010-04-10 07:35:31 +00:00
parent f4eac3d87f
commit b579350cd1
3 changed files with 45 additions and 11 deletions

View File

@ -1065,10 +1065,6 @@ def templatetag(parser, token):
return TemplateTagNode(tag)
templatetag = register.tag(templatetag)
# Backwards compatibility check which will fail against for old comma
# separated arguments in the url tag.
url_backwards_re = re.compile(r'''(('[^']*'|"[^"]*"|[^,]+)=?)+$''')
def url(parser, token):
"""
Returns an absolute URL matching given view with its parameters.
@ -1117,13 +1113,38 @@ def url(parser, token):
asvar = bits[-1]
bits = bits[:-2]
# Backwards compatibility: {% url urlname arg1,arg2 %} or
# {% url urlname arg1,arg2 as foo %} cases.
if bits:
old_args = ''.join(bits)
if not url_backwards_re.match(old_args):
bits = old_args.split(",")
# Backwards compatibility: check for the old comma separated format
# {% url urlname arg1,arg2 %}
# Initial check - that the first space separated bit has a comma in it
if bits and ',' in bits[0]:
check_old_format = True
# In order to *really* be old format, there must be a comma
# in *every* space separated bit, except the last.
for bit in bits[1:-1]:
if ',' not in bit:
# No comma in this bit. Either the comma we found
# in bit 1 was a false positive (e.g., comma in a string),
# or there is a syntax problem with missing commas
check_old_format = False
break
else:
# No comma found - must be new format.
check_old_format = False
if check_old_format:
# Confirm that this is old format by trying to parse the first
# argument. An exception will be raised if the comma is
# unexpected (i.e. outside of a static string).
match = kwarg_re.match(bits[0])
if match:
value = match.groups()[1]
try:
parser.compile_filter(value)
except TemplateSyntaxError:
bits = ''.join(bits).split(',')
# Now all the bits are parsed into new format,
# process them as template vars
if len(bits):
for bit in bits:
match = kwarg_re.match(bit)

View File

@ -364,8 +364,12 @@ class Templates(unittest.TestCase):
settings.TEMPLATE_STRING_IF_INVALID = invalid_str
for is_cached in (False, True):
try:
start = datetime.now()
test_template = loader.get_template(name)
end = datetime.now()
output = self.render(test_template, vals)
if end-start > timedelta(seconds=0.2):
failures.append("Template test (Cached='%s', TEMPLATE_STRING_IF_INVALID='%s'): %s -- FAILED. Took too long to parse test" % (is_cached, invalid_str, name))
except ContextStackException:
failures.append("Template test (Cached='%s', TEMPLATE_STRING_IF_INVALID='%s'): %s -- FAILED. Context stack was left imbalanced" % (is_cached, invalid_str, name))
continue
@ -1175,13 +1179,20 @@ class Templates(unittest.TestCase):
# Successes
'legacyurl02': ('{% url regressiontests.templates.views.client_action id=client.id,action="update" %}', {'client': {'id': 1}}, '/url_tag/client/1/update/'),
'legacyurl02a': ('{% url regressiontests.templates.views.client_action client.id,"update" %}', {'client': {'id': 1}}, '/url_tag/client/1/update/'),
'legacyurl02b': ("{% url regressiontests.templates.views.client_action id=client.id,action='update' %}", {'client': {'id': 1}}, '/url_tag/client/1/update/'),
'legacyurl02c': ("{% url regressiontests.templates.views.client_action client.id,'update' %}", {'client': {'id': 1}}, '/url_tag/client/1/update/'),
'legacyurl10': ('{% url regressiontests.templates.views.client_action id=client.id,action="two words" %}', {'client': {'id': 1}}, '/url_tag/client/1/two%20words/'),
'legacyurl13': ('{% url regressiontests.templates.views.client_action id=client.id, action=arg|join:"-" %}', {'client': {'id': 1}, 'arg':['a','b']}, '/url_tag/client/1/a-b/'),
'legacyurl14': ('{% url regressiontests.templates.views.client_action client.id, arg|join:"-" %}', {'client': {'id': 1}, 'arg':['a','b']}, '/url_tag/client/1/a-b/'),
'legacyurl16': ('{% url regressiontests.templates.views.client_action action="update",id="1" %}', {}, '/url_tag/client/1/update/'),
'legacyurl16a': ("{% url regressiontests.templates.views.client_action action='update',id='1' %}", {}, '/url_tag/client/1/update/'),
'legacyurl17': ('{% url regressiontests.templates.views.client_action client_id=client.my_id,action=action %}', {'client': {'my_id': 1}, 'action': 'update'}, '/url_tag/client/1/update/'),
'url01': ('{% url regressiontests.templates.views.client client.id %}', {'client': {'id': 1}}, '/url_tag/client/1/'),
'url02': ('{% url regressiontests.templates.views.client_action id=client.id action="update" %}', {'client': {'id': 1}}, '/url_tag/client/1/update/'),
'url02a': ('{% url regressiontests.templates.views.client_action client.id "update" %}', {'client': {'id': 1}}, '/url_tag/client/1/update/'),
'url02b': ("{% url regressiontests.templates.views.client_action id=client.id action='update' %}", {'client': {'id': 1}}, '/url_tag/client/1/update/'),
'url02c': ("{% url regressiontests.templates.views.client_action client.id 'update' %}", {'client': {'id': 1}}, '/url_tag/client/1/update/'),
'url03': ('{% url regressiontests.templates.views.index %}', {}, '/url_tag/'),
'url04': ('{% url named.client client.id %}', {'client': {'id': 1}}, '/url_tag/named-client/1/'),
'url05': (u'{% url метка_оператора v %}', {'v': u'Ω'}, '/url_tag/%D0%AE%D0%BD%D0%B8%D0%BA%D0%BE%D0%B4/%CE%A9/'),
@ -1195,6 +1206,7 @@ class Templates(unittest.TestCase):
'url13': ('{% url regressiontests.templates.views.client_action id=client.id action=arg|join:"-" %}', {'client': {'id': 1}, 'arg':['a','b']}, '/url_tag/client/1/a-b/'),
'url14': ('{% url regressiontests.templates.views.client_action client.id arg|join:"-" %}', {'client': {'id': 1}, 'arg':['a','b']}, '/url_tag/client/1/a-b/'),
'url15': ('{% url regressiontests.templates.views.client_action 12 "test" %}', {}, '/url_tag/client/12/test/'),
'url18': ('{% url regressiontests.templates.views.client "1,2" %}', {}, '/url_tag/client/1,2/'),
# Failures
'url-fail01': ('{% url %}', {}, template.TemplateSyntaxError),

View File

@ -6,8 +6,9 @@ urlpatterns = patterns('',
# Test urls for testing reverse lookups
(r'^$', views.index),
(r'^client/(\d+)/$', views.client),
(r'^client/([\d,]+)/$', views.client),
(r'^client/(?P<id>\d+)/(?P<action>[^/]+)/$', views.client_action),
(r'^client/(?P<client_id>\d+)/(?P<action>[^/]+)/$', views.client_action),
url(r'^named-client/(\d+)/$', views.client2, name="named.client"),
# Unicode strings are permitted everywhere.