115 lines
5.2 KiB
Python
115 lines
5.2 KiB
Python
# Copyright (c) 2010-2011 OpenStack, LLC.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from webob import Request
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from webob.exc import HTTPBadRequest
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class DomainRemapMiddleware(object):
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"""
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Middleware that translates container and account parts of a domain to
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path parameters that the proxy server understands.
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container.account.storageurl/object gets translated to
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container.account.storageurl/path_root/account/container/object
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account.storageurl/path_root/container/object gets translated to
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account.storageurl/path_root/account/container/object
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Browsers can convert a host header to lowercase, so check that reseller
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prefix on the account is the correct case. This is done by comparing the
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items in the reseller_prefixes config option to the found prefix. If they
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match except for case, the item from reseller_prefixes will be used
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instead of the found reseller prefix. The reseller_prefixes list is
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exclusive. If defined, any request with an account prefix not in that list
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will be ignored by this middleware. reseller_prefixes defaults to 'AUTH'.
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Note that this middleware requires that container names and account names
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(except as described above) must be DNS-compatible. This means that the
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account name created in the system and the containers created by users
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cannot exceede 63 characters or have UTF-8 characters. These are
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restrictions over and above what swift requires and are not explicitly
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checked. Simply put, the this middleware will do a best-effort attempt to
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derive account and container names from elements in the domain name and
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put those derived values into the URL path (leaving the Host header
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unchanged).
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"""
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def __init__(self, app, conf):
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self.app = app
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self.storage_domain = conf.get('storage_domain', 'example.com')
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if self.storage_domain and self.storage_domain[0] != '.':
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self.storage_domain = '.' + self.storage_domain
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self.path_root = conf.get('path_root', 'v1').strip('/')
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prefixes = conf.get('reseller_prefixes', 'AUTH')
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self.reseller_prefixes = [x.strip() for x in prefixes.split(',')
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if x.strip()]
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self.reseller_prefixes_lower = [x.lower()
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for x in self.reseller_prefixes]
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def __call__(self, env, start_response):
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if not self.storage_domain:
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return self.app(env, start_response)
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given_domain = env['HTTP_HOST']
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port = ''
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if ':' in given_domain:
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given_domain, port = given_domain.rsplit(':', 1)
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if given_domain.endswith(self.storage_domain):
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parts_to_parse = given_domain[:-len(self.storage_domain)]
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parts_to_parse = parts_to_parse.strip('.').split('.')
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len_parts_to_parse = len(parts_to_parse)
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if len_parts_to_parse == 2:
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container, account = parts_to_parse
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elif len_parts_to_parse == 1:
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container, account = None, parts_to_parse[0]
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else:
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resp = HTTPBadRequest(request=Request(env),
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body='Bad domain in host header',
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content_type='text/plain')
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return resp(env, start_response)
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if '_' not in account and '-' in account:
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account = account.replace('-', '_', 1)
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account_reseller_prefix = account.split('_', 1)[0].lower()
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if account_reseller_prefix not in self.reseller_prefixes_lower:
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# account prefix is not in config list. bail.
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return self.app(env, start_response)
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prefix_index = self.reseller_prefixes_lower.index(
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account_reseller_prefix)
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real_prefix = self.reseller_prefixes[prefix_index]
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if not account.startswith(real_prefix):
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account_suffix = account[len(real_prefix):]
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account = real_prefix + account_suffix
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path = env['PATH_INFO'].strip('/')
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new_path_parts = ['', self.path_root, account]
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if container:
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new_path_parts.append(container)
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if path.startswith(self.path_root):
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path = path[len(self.path_root):].lstrip('/')
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if path:
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new_path_parts.append(path)
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new_path = '/'.join(new_path_parts)
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env['PATH_INFO'] = new_path
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return self.app(env, start_response)
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def filter_factory(global_conf, **local_conf):
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conf = global_conf.copy()
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conf.update(local_conf)
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def domain_filter(app):
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return DomainRemapMiddleware(app, conf)
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return domain_filter
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