1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
# bzr-dbus: dbus support for bzr/bzrlib.
# Copyright (C) 2007 Canonical Limited.
# Author: Robert Collins.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
"""URL mapping facility."""
class URLMapper(object):
"""A class to help map private URL's to public ones.
Instances have the following attributes:
maps: A dict of source_url:[target_url] relationships. When mapping
a url, all source_urls that are a prefix of the url being mapped
are used. To prevent false matches, its recommended that source_url end
in a / (unless of course you want the behaviour of replacing other
directories with the same prefix.
"""
def __init__(self):
"""Create a new URLMapper."""
self.maps = {}
def add_map(self, source_prefix, target_prefix):
"""Add a url prefix to be mapped when advertising revisions."""
source_prefix = self.canonicalise_source_prefix(source_prefix)
self.maps.setdefault(source_prefix, []).append(target_prefix)
def canonicalise_source_prefix(self, source_prefix):
"""Remove the readonly+ prefix from source_prefix if it is there."""
if source_prefix.startswith('readonly+'):
return source_prefix[len('readonly+'):]
return source_prefix
def map(self, url):
"""map url to a list of translated urls.
:param url: The url to map.
:result: A list of mapped urls sorted by the inverse length of the
source_url used to perform the mapping. When no mapping is found,
the an empty list is returned.
"""
maps = reversed(sorted(self.maps.items(), key=lambda x:len(x)))
result = []
for source, targets in maps:
if url.startswith(source):
suffix = url[len(source):]
for target in targets:
result.append(target + suffix)
return result
def remove_map(self, source_prefix, target_prefix):
"""Remove the mapping of source_prefix to target_prefix."""
source_prefix = self.canonicalise_source_prefix(source_prefix)
pos = self.maps[source_prefix].index(target_prefix)
del self.maps[source_prefix][pos]
if not self.maps[source_prefix]:
del self.maps[source_prefix]
|