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250
Paste-1.7.5.1-py2.6.egg/paste/urlmap.py
Executable file
250
Paste-1.7.5.1-py2.6.egg/paste/urlmap.py
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# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
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# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
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"""
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Map URL prefixes to WSGI applications. See ``URLMap``
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"""
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from UserDict import DictMixin
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import re
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import os
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import cgi
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from paste import httpexceptions
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__all__ = ['URLMap', 'PathProxyURLMap']
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def urlmap_factory(loader, global_conf, **local_conf):
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if 'not_found_app' in local_conf:
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not_found_app = local_conf.pop('not_found_app')
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else:
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not_found_app = global_conf.get('not_found_app')
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if not_found_app:
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not_found_app = loader.get_app(not_found_app, global_conf=global_conf)
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urlmap = URLMap(not_found_app=not_found_app)
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for path, app_name in local_conf.items():
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path = parse_path_expression(path)
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app = loader.get_app(app_name, global_conf=global_conf)
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urlmap[path] = app
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return urlmap
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def parse_path_expression(path):
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"""
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Parses a path expression like 'domain foobar.com port 20 /' or
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just '/foobar' for a path alone. Returns as an address that
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URLMap likes.
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"""
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parts = path.split()
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domain = port = path = None
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while parts:
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if parts[0] == 'domain':
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parts.pop(0)
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if not parts:
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raise ValueError("'domain' must be followed with a domain name")
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if domain:
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raise ValueError("'domain' given twice")
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domain = parts.pop(0)
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elif parts[0] == 'port':
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parts.pop(0)
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if not parts:
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raise ValueError("'port' must be followed with a port number")
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if port:
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raise ValueError("'port' given twice")
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port = parts.pop(0)
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else:
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if path:
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raise ValueError("more than one path given (have %r, got %r)"
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% (path, parts[0]))
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path = parts.pop(0)
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s = ''
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if domain:
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s = 'http://%s' % domain
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if port:
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if not domain:
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raise ValueError("If you give a port, you must also give a domain")
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s += ':' + port
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if path:
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if s:
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s += '/'
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s += path
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return s
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class URLMap(DictMixin):
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"""
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URLMap instances are dictionary-like object that dispatch to one
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of several applications based on the URL.
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The dictionary keys are URLs to match (like
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``PATH_INFO.startswith(url)``), and the values are applications to
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dispatch to. URLs are matched most-specific-first, i.e., longest
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URL first. The ``SCRIPT_NAME`` and ``PATH_INFO`` environmental
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variables are adjusted to indicate the new context.
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URLs can also include domains, like ``http://blah.com/foo``, or as
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tuples ``('blah.com', '/foo')``. This will match domain names; without
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the ``http://domain`` or with a domain of ``None`` any domain will be
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matched (so long as no other explicit domain matches). """
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def __init__(self, not_found_app=None):
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self.applications = []
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if not not_found_app:
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not_found_app = self.not_found_app
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self.not_found_application = not_found_app
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norm_url_re = re.compile('//+')
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domain_url_re = re.compile('^(http|https)://')
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def not_found_app(self, environ, start_response):
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mapper = environ.get('paste.urlmap_object')
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if mapper:
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matches = [p for p, a in mapper.applications]
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extra = 'defined apps: %s' % (
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',\n '.join(map(repr, matches)))
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else:
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extra = ''
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extra += '\nSCRIPT_NAME: %r' % environ.get('SCRIPT_NAME')
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extra += '\nPATH_INFO: %r' % environ.get('PATH_INFO')
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extra += '\nHTTP_HOST: %r' % environ.get('HTTP_HOST')
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app = httpexceptions.HTTPNotFound(
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environ['PATH_INFO'],
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comment=cgi.escape(extra)).wsgi_application
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return app(environ, start_response)
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def normalize_url(self, url, trim=True):
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if isinstance(url, (list, tuple)):
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domain = url[0]
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url = self.normalize_url(url[1])[1]
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return domain, url
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assert (not url or url.startswith('/')
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or self.domain_url_re.search(url)), (
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"URL fragments must start with / or http:// (you gave %r)" % url)
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match = self.domain_url_re.search(url)
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if match:
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url = url[match.end():]
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if '/' in url:
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domain, url = url.split('/', 1)
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url = '/' + url
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else:
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domain, url = url, ''
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else:
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domain = None
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url = self.norm_url_re.sub('/', url)
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if trim:
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url = url.rstrip('/')
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return domain, url
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def sort_apps(self):
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"""
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Make sure applications are sorted with longest URLs first
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"""
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def key(app_desc):
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(domain, url), app = app_desc
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if not domain:
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# Make sure empty domains sort last:
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return '\xff', -len(url)
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else:
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return domain, -len(url)
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apps = [(key(desc), desc) for desc in self.applications]
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apps.sort()
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self.applications = [desc for (sortable, desc) in apps]
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def __setitem__(self, url, app):
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if app is None:
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try:
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del self[url]
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except KeyError:
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pass
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return
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dom_url = self.normalize_url(url)
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if dom_url in self:
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del self[dom_url]
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self.applications.append((dom_url, app))
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self.sort_apps()
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def __getitem__(self, url):
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dom_url = self.normalize_url(url)
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for app_url, app in self.applications:
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if app_url == dom_url:
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return app
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raise KeyError(
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"No application with the url %r (domain: %r; existing: %s)"
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% (url[1], url[0] or '*', self.applications))
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def __delitem__(self, url):
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url = self.normalize_url(url)
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for app_url, app in self.applications:
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if app_url == url:
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self.applications.remove((app_url, app))
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break
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else:
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raise KeyError(
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"No application with the url %r" % (url,))
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def keys(self):
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return [app_url for app_url, app in self.applications]
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def __call__(self, environ, start_response):
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host = environ.get('HTTP_HOST', environ.get('SERVER_NAME')).lower()
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if ':' in host:
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host, port = host.split(':', 1)
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else:
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if environ['wsgi.url_scheme'] == 'http':
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port = '80'
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else:
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port = '443'
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path_info = environ.get('PATH_INFO')
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path_info = self.normalize_url(path_info, False)[1]
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for (domain, app_url), app in self.applications:
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if domain and domain != host and domain != host+':'+port:
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continue
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if (path_info == app_url
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or path_info.startswith(app_url + '/')):
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environ['SCRIPT_NAME'] += app_url
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environ['PATH_INFO'] = path_info[len(app_url):]
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return app(environ, start_response)
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environ['paste.urlmap_object'] = self
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return self.not_found_application(environ, start_response)
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class PathProxyURLMap(object):
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"""
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This is a wrapper for URLMap that catches any strings that
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are passed in as applications; these strings are treated as
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filenames (relative to `base_path`) and are passed to the
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callable `builder`, which will return an application.
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This is intended for cases when configuration files can be
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treated as applications.
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`base_paste_url` is the URL under which all applications added through
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this wrapper must go. Use ``""`` if you want this to not
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change incoming URLs.
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"""
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def __init__(self, map, base_paste_url, base_path, builder):
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self.map = map
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self.base_paste_url = self.map.normalize_url(base_paste_url)
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self.base_path = base_path
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self.builder = builder
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def __setitem__(self, url, app):
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if isinstance(app, (str, unicode)):
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app_fn = os.path.join(self.base_path, app)
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app = self.builder(app_fn)
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url = self.map.normalize_url(url)
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# @@: This means http://foo.com/bar will potentially
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# match foo.com, but /base_paste_url/bar, which is unintuitive
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url = (url[0] or self.base_paste_url[0],
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self.base_paste_url[1] + url[1])
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self.map[url] = app
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def __getattr__(self, attr):
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return getattr(self.map, attr)
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# This is really the only settable attribute
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def not_found_application__get(self):
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return self.map.not_found_application
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def not_found_application__set(self, value):
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self.map.not_found_application = value
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not_found_application = property(not_found_application__get,
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not_found_application__set)
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