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439 lines
16 KiB
Python
439 lines
16 KiB
Python
"""WSGI interface (see PEP 333 and 3333).
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Note that WSGI environ keys and values are 'native strings'; that is,
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whatever the type of "" is. For Python 2, that's a byte string; for Python 3,
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it's a unicode string. But PEP 3333 says: "even if Python's str type is
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actually Unicode "under the hood", the content of native strings must
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still be translatable to bytes via the Latin-1 encoding!"
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"""
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import sys as _sys
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import cherrypy as _cherrypy
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from cherrypy._cpcompat import BytesIO, bytestr, ntob, ntou, py3k, unicodestr
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from cherrypy import _cperror
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from cherrypy.lib import httputil
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from cherrypy.lib import is_closable_iterator
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def downgrade_wsgi_ux_to_1x(environ):
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"""Return a new environ dict for WSGI 1.x from the given WSGI u.x environ.
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"""
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env1x = {}
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url_encoding = environ[ntou('wsgi.url_encoding')]
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for k, v in list(environ.items()):
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if k in [ntou('PATH_INFO'), ntou('SCRIPT_NAME'), ntou('QUERY_STRING')]:
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v = v.encode(url_encoding)
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elif isinstance(v, unicodestr):
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v = v.encode('ISO-8859-1')
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env1x[k.encode('ISO-8859-1')] = v
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return env1x
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class VirtualHost(object):
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"""Select a different WSGI application based on the Host header.
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This can be useful when running multiple sites within one CP server.
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It allows several domains to point to different applications. For example::
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root = Root()
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RootApp = cherrypy.Application(root)
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Domain2App = cherrypy.Application(root)
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SecureApp = cherrypy.Application(Secure())
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vhost = cherrypy._cpwsgi.VirtualHost(RootApp,
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domains={'www.domain2.example': Domain2App,
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'www.domain2.example:443': SecureApp,
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})
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cherrypy.tree.graft(vhost)
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"""
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default = None
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"""Required. The default WSGI application."""
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use_x_forwarded_host = True
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"""If True (the default), any "X-Forwarded-Host"
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request header will be used instead of the "Host" header. This
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is commonly added by HTTP servers (such as Apache) when proxying."""
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domains = {}
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"""A dict of {host header value: application} pairs.
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The incoming "Host" request header is looked up in this dict,
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and, if a match is found, the corresponding WSGI application
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will be called instead of the default. Note that you often need
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separate entries for "example.com" and "www.example.com".
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In addition, "Host" headers may contain the port number.
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"""
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def __init__(self, default, domains=None, use_x_forwarded_host=True):
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self.default = default
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self.domains = domains or {}
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self.use_x_forwarded_host = use_x_forwarded_host
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def __call__(self, environ, start_response):
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domain = environ.get('HTTP_HOST', '')
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if self.use_x_forwarded_host:
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domain = environ.get("HTTP_X_FORWARDED_HOST", domain)
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nextapp = self.domains.get(domain)
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if nextapp is None:
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nextapp = self.default
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return nextapp(environ, start_response)
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class InternalRedirector(object):
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"""WSGI middleware that handles raised cherrypy.InternalRedirect."""
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def __init__(self, nextapp, recursive=False):
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self.nextapp = nextapp
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self.recursive = recursive
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def __call__(self, environ, start_response):
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redirections = []
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while True:
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environ = environ.copy()
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try:
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return self.nextapp(environ, start_response)
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except _cherrypy.InternalRedirect:
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ir = _sys.exc_info()[1]
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sn = environ.get('SCRIPT_NAME', '')
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path = environ.get('PATH_INFO', '')
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qs = environ.get('QUERY_STRING', '')
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# Add the *previous* path_info + qs to redirections.
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old_uri = sn + path
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if qs:
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old_uri += "?" + qs
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redirections.append(old_uri)
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if not self.recursive:
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# Check to see if the new URI has been redirected to
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# already
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new_uri = sn + ir.path
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if ir.query_string:
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new_uri += "?" + ir.query_string
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if new_uri in redirections:
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ir.request.close()
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raise RuntimeError("InternalRedirector visited the "
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"same URL twice: %r" % new_uri)
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# Munge the environment and try again.
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environ['REQUEST_METHOD'] = "GET"
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environ['PATH_INFO'] = ir.path
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environ['QUERY_STRING'] = ir.query_string
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environ['wsgi.input'] = BytesIO()
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environ['CONTENT_LENGTH'] = "0"
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environ['cherrypy.previous_request'] = ir.request
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class ExceptionTrapper(object):
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"""WSGI middleware that traps exceptions."""
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def __init__(self, nextapp, throws=(KeyboardInterrupt, SystemExit)):
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self.nextapp = nextapp
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self.throws = throws
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def __call__(self, environ, start_response):
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return _TrappedResponse(
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self.nextapp,
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environ,
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start_response,
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self.throws
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)
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class _TrappedResponse(object):
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response = iter([])
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def __init__(self, nextapp, environ, start_response, throws):
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self.nextapp = nextapp
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self.environ = environ
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self.start_response = start_response
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self.throws = throws
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self.started_response = False
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self.response = self.trap(
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self.nextapp, self.environ, self.start_response)
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self.iter_response = iter(self.response)
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def __iter__(self):
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self.started_response = True
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return self
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if py3k:
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def __next__(self):
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return self.trap(next, self.iter_response)
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else:
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def next(self):
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return self.trap(self.iter_response.__next__)
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def close(self):
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if hasattr(self.response, 'close'):
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self.response.close()
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def trap(self, func, *args, **kwargs):
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try:
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return func(*args, **kwargs)
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except self.throws:
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raise
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except StopIteration:
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raise
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except:
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tb = _cperror.format_exc()
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#print('trapped (started %s):' % self.started_response, tb)
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_cherrypy.log(tb, severity=40)
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if not _cherrypy.request.show_tracebacks:
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tb = ""
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s, h, b = _cperror.bare_error(tb)
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if py3k:
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# What fun.
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s = s.decode('ISO-8859-1')
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h = [(k.decode('ISO-8859-1'), v.decode('ISO-8859-1'))
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for k, v in h]
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if self.started_response:
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# Empty our iterable (so future calls raise StopIteration)
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self.iter_response = iter([])
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else:
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self.iter_response = iter(b)
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try:
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self.start_response(s, h, _sys.exc_info())
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except:
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# "The application must not trap any exceptions raised by
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# start_response, if it called start_response with exc_info.
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# Instead, it should allow such exceptions to propagate
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# back to the server or gateway."
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# But we still log and call close() to clean up ourselves.
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_cherrypy.log(traceback=True, severity=40)
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raise
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if self.started_response:
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return ntob("").join(b)
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else:
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return b
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# WSGI-to-CP Adapter #
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class AppResponse(object):
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"""WSGI response iterable for CherryPy applications."""
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def __init__(self, environ, start_response, cpapp):
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self.cpapp = cpapp
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try:
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if not py3k:
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if environ.get(ntou('wsgi.version')) == (ntou('u'), 0):
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environ = downgrade_wsgi_ux_to_1x(environ)
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self.environ = environ
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self.run()
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r = _cherrypy.serving.response
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outstatus = r.output_status
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if not isinstance(outstatus, bytestr):
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raise TypeError("response.output_status is not a byte string.")
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outheaders = []
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for k, v in r.header_list:
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if not isinstance(k, bytestr):
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raise TypeError(
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"response.header_list key %r is not a byte string." %
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k)
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if not isinstance(v, bytestr):
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raise TypeError(
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"response.header_list value %r is not a byte string." %
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v)
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outheaders.append((k, v))
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if py3k:
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# According to PEP 3333, when using Python 3, the response
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# status and headers must be bytes masquerading as unicode;
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# that is, they must be of type "str" but are restricted to
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# code points in the "latin-1" set.
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outstatus = outstatus.decode('ISO-8859-1')
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outheaders = [(k.decode('ISO-8859-1'), v.decode('ISO-8859-1'))
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for k, v in outheaders]
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self.iter_response = iter(r.body)
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self.write = start_response(outstatus, outheaders)
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except:
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self.close()
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raise
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def __iter__(self):
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return self
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if py3k:
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def __next__(self):
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return next(self.iter_response)
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else:
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def next(self):
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return next(self.iter_response)
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def close(self):
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"""Close and de-reference the current request and response. (Core)"""
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streaming = _cherrypy.serving.response.stream
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self.cpapp.release_serving()
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# We avoid the expense of examining the iterator to see if it's
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# closable unless we are streaming the response, as that's the
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# only situation where we are going to have an iterator which
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# may not have been exhausted yet.
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if streaming and is_closable_iterator(self.iter_response):
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iter_close = self.iter_response.close
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try:
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iter_close()
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except Exception:
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_cherrypy.log(traceback=True, severity=40)
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def run(self):
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"""Create a Request object using environ."""
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env = self.environ.get
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local = httputil.Host('', int(env('SERVER_PORT', 80)),
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env('SERVER_NAME', ''))
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remote = httputil.Host(env('REMOTE_ADDR', ''),
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int(env('REMOTE_PORT', -1) or -1),
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env('REMOTE_HOST', ''))
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scheme = env('wsgi.url_scheme')
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sproto = env('ACTUAL_SERVER_PROTOCOL', "HTTP/1.1")
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request, resp = self.cpapp.get_serving(local, remote, scheme, sproto)
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# LOGON_USER is served by IIS, and is the name of the
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# user after having been mapped to a local account.
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# Both IIS and Apache set REMOTE_USER, when possible.
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request.login = env('LOGON_USER') or env('REMOTE_USER') or None
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request.multithread = self.environ['wsgi.multithread']
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request.multiprocess = self.environ['wsgi.multiprocess']
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request.wsgi_environ = self.environ
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request.prev = env('cherrypy.previous_request', None)
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meth = self.environ['REQUEST_METHOD']
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path = httputil.urljoin(self.environ.get('SCRIPT_NAME', ''),
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self.environ.get('PATH_INFO', ''))
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qs = self.environ.get('QUERY_STRING', '')
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if py3k:
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# This isn't perfect; if the given PATH_INFO is in the
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# wrong encoding, it may fail to match the appropriate config
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# section URI. But meh.
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old_enc = self.environ.get('wsgi.url_encoding', 'ISO-8859-1')
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new_enc = self.cpapp.find_config(self.environ.get('PATH_INFO', ''),
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"request.uri_encoding", 'utf-8')
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if new_enc.lower() != old_enc.lower():
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# Even though the path and qs are unicode, the WSGI server
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# is required by PEP 3333 to coerce them to ISO-8859-1
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# masquerading as unicode. So we have to encode back to
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# bytes and then decode again using the "correct" encoding.
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try:
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u_path = path.encode(old_enc).decode(new_enc)
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u_qs = qs.encode(old_enc).decode(new_enc)
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except (UnicodeEncodeError, UnicodeDecodeError):
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# Just pass them through without transcoding and hope.
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pass
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else:
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# Only set transcoded values if they both succeed.
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path = u_path
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qs = u_qs
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rproto = self.environ.get('SERVER_PROTOCOL')
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headers = self.translate_headers(self.environ)
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rfile = self.environ['wsgi.input']
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request.run(meth, path, qs, rproto, headers, rfile)
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headerNames = {'HTTP_CGI_AUTHORIZATION': 'Authorization',
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'CONTENT_LENGTH': 'Content-Length',
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'CONTENT_TYPE': 'Content-Type',
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'REMOTE_HOST': 'Remote-Host',
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'REMOTE_ADDR': 'Remote-Addr',
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}
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def translate_headers(self, environ):
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"""Translate CGI-environ header names to HTTP header names."""
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for cgiName in environ:
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# We assume all incoming header keys are uppercase already.
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if cgiName in self.headerNames:
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yield self.headerNames[cgiName], environ[cgiName]
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elif cgiName[:5] == "HTTP_":
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# Hackish attempt at recovering original header names.
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translatedHeader = cgiName[5:].replace("_", "-")
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yield translatedHeader, environ[cgiName]
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class CPWSGIApp(object):
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"""A WSGI application object for a CherryPy Application."""
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pipeline = [('ExceptionTrapper', ExceptionTrapper),
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('InternalRedirector', InternalRedirector),
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]
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"""A list of (name, wsgiapp) pairs. Each 'wsgiapp' MUST be a
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constructor that takes an initial, positional 'nextapp' argument,
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plus optional keyword arguments, and returns a WSGI application
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(that takes environ and start_response arguments). The 'name' can
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be any you choose, and will correspond to keys in self.config."""
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head = None
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"""Rather than nest all apps in the pipeline on each call, it's only
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done the first time, and the result is memoized into self.head. Set
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this to None again if you change self.pipeline after calling self."""
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config = {}
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"""A dict whose keys match names listed in the pipeline. Each
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value is a further dict which will be passed to the corresponding
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named WSGI callable (from the pipeline) as keyword arguments."""
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response_class = AppResponse
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"""The class to instantiate and return as the next app in the WSGI chain.
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"""
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def __init__(self, cpapp, pipeline=None):
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self.cpapp = cpapp
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self.pipeline = self.pipeline[:]
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if pipeline:
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self.pipeline.extend(pipeline)
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self.config = self.config.copy()
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def tail(self, environ, start_response):
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"""WSGI application callable for the actual CherryPy application.
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You probably shouldn't call this; call self.__call__ instead,
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so that any WSGI middleware in self.pipeline can run first.
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"""
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return self.response_class(environ, start_response, self.cpapp)
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def __call__(self, environ, start_response):
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head = self.head
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if head is None:
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# Create and nest the WSGI apps in our pipeline (in reverse order).
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# Then memoize the result in self.head.
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head = self.tail
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for name, callable in self.pipeline[::-1]:
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conf = self.config.get(name, {})
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head = callable(head, **conf)
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self.head = head
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return head(environ, start_response)
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def namespace_handler(self, k, v):
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"""Config handler for the 'wsgi' namespace."""
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if k == "pipeline":
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# Note this allows multiple 'wsgi.pipeline' config entries
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# (but each entry will be processed in a 'random' order).
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# It should also allow developers to set default middleware
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# in code (passed to self.__init__) that deployers can add to
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# (but not remove) via config.
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self.pipeline.extend(v)
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elif k == "response_class":
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self.response_class = v
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else:
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name, arg = k.split(".", 1)
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bucket = self.config.setdefault(name, {})
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bucket[arg] = v
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