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# hgweb/request.py - An http request from either CGI or the standalone server.
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#
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# Copyright 21 May 2005 - (c) 2005 Jake Edge <jake@edge2.net>
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# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import errno
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import socket
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import wsgiref.headers as wsgiheaders
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#import wsgiref.validate
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from .common import (
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ErrorResponse,
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HTTP_NOT_MODIFIED,
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statusmessage,
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)
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from ..thirdparty import (
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attr,
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)
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from .. import (
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error,
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pycompat,
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util,
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)
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class multidict(object):
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"""A dict like object that can store multiple values for a key.
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Used to store parsed request parameters.
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This is inspired by WebOb's class of the same name.
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"""
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def __init__(self):
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# Stores (key, value) 2-tuples. This isn't the most efficient. But we
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# don't rely on parameters that much, so it shouldn't be a perf issue.
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# we can always add dict for fast lookups.
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self._items = []
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def __getitem__(self, key):
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"""Returns the last set value for a key."""
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for k, v in reversed(self._items):
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if k == key:
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return v
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raise KeyError(key)
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def __setitem__(self, key, value):
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"""Replace a values for a key with a new value."""
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try:
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del self[key]
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except KeyError:
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pass
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self._items.append((key, value))
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def __delitem__(self, key):
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"""Delete all values for a key."""
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oldlen = len(self._items)
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self._items[:] = [(k, v) for k, v in self._items if k != key]
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if oldlen == len(self._items):
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raise KeyError(key)
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def __contains__(self, key):
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return any(k == key for k, v in self._items)
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def __len__(self):
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return len(self._items)
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def get(self, key, default=None):
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try:
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return self.__getitem__(key)
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except KeyError:
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return default
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def add(self, key, value):
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"""Add a new value for a key. Does not replace existing values."""
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self._items.append((key, value))
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def getall(self, key):
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"""Obtains all values for a key."""
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return [v for k, v in self._items if k == key]
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def getone(self, key):
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"""Obtain a single value for a key.
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Raises KeyError if key not defined or it has multiple values set.
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"""
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vals = self.getall(key)
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if not vals:
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raise KeyError(key)
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if len(vals) > 1:
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raise KeyError('multiple values for %r' % key)
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return vals[0]
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def asdictoflists(self):
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d = {}
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for k, v in self._items:
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if k in d:
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d[k].append(v)
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else:
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d[k] = [v]
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return d
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@attr.s(frozen=True)
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class parsedrequest(object):
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"""Represents a parsed WSGI request.
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Contains both parsed parameters as well as a handle on the input stream.
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"""
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# Request method.
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method = attr.ib()
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# Full URL for this request.
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url = attr.ib()
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# URL without any path components. Just <proto>://<host><port>.
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baseurl = attr.ib()
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# Advertised URL. Like ``url`` and ``baseurl`` but uses SERVER_NAME instead
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# of HTTP: Host header for hostname. This is likely what clients used.
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advertisedurl = attr.ib()
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advertisedbaseurl = attr.ib()
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# URL scheme (part before ``://``). e.g. ``http`` or ``https``.
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urlscheme = attr.ib()
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# Value of REMOTE_USER, if set, or None.
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remoteuser = attr.ib()
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# Value of REMOTE_HOST, if set, or None.
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remotehost = attr.ib()
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# WSGI application path.
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apppath = attr.ib()
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# List of path parts to be used for dispatch.
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dispatchparts = attr.ib()
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# URL path component (no query string) used for dispatch.
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dispatchpath = attr.ib()
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# Whether there is a path component to this request. This can be true
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# when ``dispatchpath`` is empty due to REPO_NAME muckery.
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havepathinfo = attr.ib()
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# The name of the repository being accessed.
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reponame = attr.ib()
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# Raw query string (part after "?" in URL).
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querystring = attr.ib()
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# multidict of query string parameters.
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qsparams = attr.ib()
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# wsgiref.headers.Headers instance. Operates like a dict with case
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# insensitive keys.
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headers = attr.ib()
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# Request body input stream.
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bodyfh = attr.ib()
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def parserequestfromenv(env, bodyfh):
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"""Parse URL components from environment variables.
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WSGI defines request attributes via environment variables. This function
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parses the environment variables into a data structure.
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"""
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# PEP-0333 defines the WSGI spec and is a useful reference for this code.
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# We first validate that the incoming object conforms with the WSGI spec.
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# We only want to be dealing with spec-conforming WSGI implementations.
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# TODO enable this once we fix internal violations.
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#wsgiref.validate.check_environ(env)
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# PEP-0333 states that environment keys and values are native strings
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# (bytes on Python 2 and str on Python 3). The code points for the Unicode
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# strings on Python 3 must be between \00000-\000FF. We deal with bytes
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# in Mercurial, so mass convert string keys and values to bytes.
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if pycompat.ispy3:
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env = {k.encode('latin-1'): v for k, v in env.iteritems()}
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env = {k: v.encode('latin-1') if isinstance(v, str) else v
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for k, v in env.iteritems()}
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# https://www.python.org/dev/peps/pep-0333/#environ-variables defines
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# the environment variables.
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# https://www.python.org/dev/peps/pep-0333/#url-reconstruction defines
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# how URLs are reconstructed.
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fullurl = env['wsgi.url_scheme'] + '://'
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advertisedfullurl = fullurl
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def addport(s):
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if env['wsgi.url_scheme'] == 'https':
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if env['SERVER_PORT'] != '443':
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s += ':' + env['SERVER_PORT']
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else:
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if env['SERVER_PORT'] != '80':
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s += ':' + env['SERVER_PORT']
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return s
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if env.get('HTTP_HOST'):
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fullurl += env['HTTP_HOST']
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else:
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fullurl += env['SERVER_NAME']
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fullurl = addport(fullurl)
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advertisedfullurl += env['SERVER_NAME']
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advertisedfullurl = addport(advertisedfullurl)
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baseurl = fullurl
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advertisedbaseurl = advertisedfullurl
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fullurl += util.urlreq.quote(env.get('SCRIPT_NAME', ''))
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advertisedfullurl += util.urlreq.quote(env.get('SCRIPT_NAME', ''))
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fullurl += util.urlreq.quote(env.get('PATH_INFO', ''))
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advertisedfullurl += util.urlreq.quote(env.get('PATH_INFO', ''))
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if env.get('QUERY_STRING'):
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fullurl += '?' + env['QUERY_STRING']
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advertisedfullurl += '?' + env['QUERY_STRING']
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# When dispatching requests, we look at the URL components (PATH_INFO
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# and QUERY_STRING) after the application root (SCRIPT_NAME). But hgwebdir
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# has the concept of "virtual" repositories. This is defined via REPO_NAME.
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# If REPO_NAME is defined, we append it to SCRIPT_NAME to form a new app
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# root. We also exclude its path components from PATH_INFO when resolving
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# the dispatch path.
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apppath = env['SCRIPT_NAME']
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if env.get('REPO_NAME'):
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if not apppath.endswith('/'):
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apppath += '/'
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apppath += env.get('REPO_NAME')
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if 'PATH_INFO' in env:
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dispatchparts = env['PATH_INFO'].strip('/').split('/')
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# Strip out repo parts.
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repoparts = env.get('REPO_NAME', '').split('/')
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if dispatchparts[:len(repoparts)] == repoparts:
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dispatchparts = dispatchparts[len(repoparts):]
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else:
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dispatchparts = []
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dispatchpath = '/'.join(dispatchparts)
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querystring = env.get('QUERY_STRING', '')
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# We store as a list so we have ordering information. We also store as
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# a dict to facilitate fast lookup.
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qsparams = multidict()
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for k, v in util.urlreq.parseqsl(querystring, keep_blank_values=True):
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qsparams.add(k, v)
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# HTTP_* keys contain HTTP request headers. The Headers structure should
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# perform case normalization for us. We just rewrite underscore to dash
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# so keys match what likely went over the wire.
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headers = []
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for k, v in env.iteritems():
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if k.startswith('HTTP_'):
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headers.append((k[len('HTTP_'):].replace('_', '-'), v))
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headers = wsgiheaders.Headers(headers)
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# This is kind of a lie because the HTTP header wasn't explicitly
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# sent. But for all intents and purposes it should be OK to lie about
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# this, since a consumer will either either value to determine how many
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# bytes are available to read.
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if 'CONTENT_LENGTH' in env and 'HTTP_CONTENT_LENGTH' not in env:
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headers['Content-Length'] = env['CONTENT_LENGTH']
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# TODO do this once we remove wsgirequest.inp, otherwise we could have
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# multiple readers from the underlying input stream.
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#bodyfh = env['wsgi.input']
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#if 'Content-Length' in headers:
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# bodyfh = util.cappedreader(bodyfh, int(headers['Content-Length']))
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return parsedrequest(method=env['REQUEST_METHOD'],
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url=fullurl, baseurl=baseurl,
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advertisedurl=advertisedfullurl,
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advertisedbaseurl=advertisedbaseurl,
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urlscheme=env['wsgi.url_scheme'],
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remoteuser=env.get('REMOTE_USER'),
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remotehost=env.get('REMOTE_HOST'),
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apppath=apppath,
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dispatchparts=dispatchparts, dispatchpath=dispatchpath,
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havepathinfo='PATH_INFO' in env,
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reponame=env.get('REPO_NAME'),
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querystring=querystring,
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qsparams=qsparams,
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headers=headers,
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bodyfh=bodyfh)
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class wsgiresponse(object):
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"""Represents a response to a WSGI request.
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A response consists of a status line, headers, and a body.
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Consumers must populate the ``status`` and ``headers`` fields and
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make a call to a ``setbody*()`` method before the response can be
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issued.
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When it is time to start sending the response over the wire,
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``sendresponse()`` is called. It handles emitting the header portion
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of the response message. It then yields chunks of body data to be
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written to the peer. Typically, the WSGI application itself calls
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and returns the value from ``sendresponse()``.
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"""
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def __init__(self, req, startresponse):
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"""Create an empty response tied to a specific request.
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``req`` is a ``parsedrequest``. ``startresponse`` is the
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``start_response`` function passed to the WSGI application.
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"""
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self._req = req
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self._startresponse = startresponse
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self.status = None
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self.headers = wsgiheaders.Headers([])
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self._bodybytes = None
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self._bodygen = None
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self._started = False
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def setbodybytes(self, b):
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"""Define the response body as static bytes."""
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if self._bodybytes is not None or self._bodygen is not None:
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raise error.ProgrammingError('cannot define body multiple times')
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self._bodybytes = b
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self.headers['Content-Length'] = '%d' % len(b)
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def setbodygen(self, gen):
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"""Define the response body as a generator of bytes."""
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if self._bodybytes is not None or self._bodygen is not None:
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raise error.ProgrammingError('cannot define body multiple times')
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self._bodygen = gen
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def sendresponse(self):
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"""Send the generated response to the client.
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Before this is called, ``status`` must be set and one of
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``setbodybytes()`` or ``setbodygen()`` must be called.
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Calling this method multiple times is not allowed.
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"""
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if self._started:
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raise error.ProgrammingError('sendresponse() called multiple times')
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self._started = True
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if not self.status:
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raise error.ProgrammingError('status line not defined')
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if self._bodybytes is None and self._bodygen is None:
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raise error.ProgrammingError('response body not defined')
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# Various HTTP clients (notably httplib) won't read the HTTP response
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# until the HTTP request has been sent in full. If servers (us) send a
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# response before the HTTP request has been fully sent, the connection
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# may deadlock because neither end is reading.
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#
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# We work around this by "draining" the request data before
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# sending any response in some conditions.
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drain = False
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close = False
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# If the client sent Expect: 100-continue, we assume it is smart enough
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# to deal with the server sending a response before reading the request.
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# (httplib doesn't do this.)
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if self._req.headers.get('Expect', '').lower() == '100-continue':
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pass
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# Only tend to request methods that have bodies. Strictly speaking,
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# we should sniff for a body. But this is fine for our existing
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# WSGI applications.
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elif self._req.method not in ('POST', 'PUT'):
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pass
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else:
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# If we don't know how much data to read, there's no guarantee
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# that we can drain the request responsibly. The WSGI
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# specification only says that servers *should* ensure the
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# input stream doesn't overrun the actual request. So there's
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# no guarantee that reading until EOF won't corrupt the stream
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# state.
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if not isinstance(self._req.bodyfh, util.cappedreader):
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close = True
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else:
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# We /could/ only drain certain HTTP response codes. But 200 and
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# non-200 wire protocol responses both require draining. Since
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# we have a capped reader in place for all situations where we
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# drain, it is safe to read from that stream. We'll either do
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# a drain or no-op if we're already at EOF.
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drain = True
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if close:
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self.headers['Connection'] = 'Close'
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if drain:
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assert isinstance(self._req.bodyfh, util.cappedreader)
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while True:
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chunk = self._req.bodyfh.read(32768)
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if not chunk:
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break
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self._startresponse(pycompat.sysstr(self.status), self.headers.items())
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if self._bodybytes:
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yield self._bodybytes
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elif self._bodygen:
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for chunk in self._bodygen:
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yield chunk
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else:
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error.ProgrammingError('do not know how to send body')
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class wsgirequest(object):
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"""Higher-level API for a WSGI request.
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WSGI applications are invoked with 2 arguments. They are used to
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instantiate instances of this class, which provides higher-level APIs
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for obtaining request parameters, writing HTTP output, etc.
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"""
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def __init__(self, wsgienv, start_response):
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version = wsgienv[r'wsgi.version']
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if (version < (1, 0)) or (version >= (2, 0)):
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raise RuntimeError("Unknown and unsupported WSGI version %d.%d"
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% version)
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inp = wsgienv[r'wsgi.input']
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if r'HTTP_CONTENT_LENGTH' in wsgienv:
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inp = util.cappedreader(inp, int(wsgienv[r'HTTP_CONTENT_LENGTH']))
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elif r'CONTENT_LENGTH' in wsgienv:
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inp = util.cappedreader(inp, int(wsgienv[r'CONTENT_LENGTH']))
|
|
|
|
|
|
self.err = wsgienv[r'wsgi.errors']
|
|
|
self.threaded = wsgienv[r'wsgi.multithread']
|
|
|
self.multiprocess = wsgienv[r'wsgi.multiprocess']
|
|
|
self.run_once = wsgienv[r'wsgi.run_once']
|
|
|
self.env = wsgienv
|
|
|
self.req = parserequestfromenv(wsgienv, inp)
|
|
|
self.res = wsgiresponse(self.req, start_response)
|
|
|
self._start_response = start_response
|
|
|
self.server_write = None
|
|
|
self.headers = []
|
|
|
|
|
|
def respond(self, status, type, filename=None, body=None):
|
|
|
if not isinstance(type, str):
|
|
|
type = pycompat.sysstr(type)
|
|
|
if self._start_response is not None:
|
|
|
self.headers.append((r'Content-Type', type))
|
|
|
if filename:
|
|
|
filename = (filename.rpartition('/')[-1]
|
|
|
.replace('\\', '\\\\').replace('"', '\\"'))
|
|
|
self.headers.append(('Content-Disposition',
|
|
|
'inline; filename="%s"' % filename))
|
|
|
if body is not None:
|
|
|
self.headers.append((r'Content-Length', str(len(body))))
|
|
|
|
|
|
for k, v in self.headers:
|
|
|
if not isinstance(v, str):
|
|
|
raise TypeError('header value must be string: %r' % (v,))
|
|
|
|
|
|
if isinstance(status, ErrorResponse):
|
|
|
self.headers.extend(status.headers)
|
|
|
if status.code == HTTP_NOT_MODIFIED:
|
|
|
# RFC 2616 Section 10.3.5: 304 Not Modified has cases where
|
|
|
# it MUST NOT include any headers other than these and no
|
|
|
# body
|
|
|
self.headers = [(k, v) for (k, v) in self.headers if
|
|
|
k in ('Date', 'ETag', 'Expires',
|
|
|
'Cache-Control', 'Vary')]
|
|
|
status = statusmessage(status.code, pycompat.bytestr(status))
|
|
|
elif status == 200:
|
|
|
status = '200 Script output follows'
|
|
|
elif isinstance(status, int):
|
|
|
status = statusmessage(status)
|
|
|
|
|
|
# Various HTTP clients (notably httplib) won't read the HTTP
|
|
|
# response until the HTTP request has been sent in full. If servers
|
|
|
# (us) send a response before the HTTP request has been fully sent,
|
|
|
# the connection may deadlock because neither end is reading.
|
|
|
#
|
|
|
# We work around this by "draining" the request data before
|
|
|
# sending any response in some conditions.
|
|
|
drain = False
|
|
|
close = False
|
|
|
|
|
|
# If the client sent Expect: 100-continue, we assume it is smart
|
|
|
# enough to deal with the server sending a response before reading
|
|
|
# the request. (httplib doesn't do this.)
|
|
|
if self.env.get(r'HTTP_EXPECT', r'').lower() == r'100-continue':
|
|
|
pass
|
|
|
# Only tend to request methods that have bodies. Strictly speaking,
|
|
|
# we should sniff for a body. But this is fine for our existing
|
|
|
# WSGI applications.
|
|
|
elif self.env[r'REQUEST_METHOD'] not in (r'POST', r'PUT'):
|
|
|
pass
|
|
|
else:
|
|
|
# If we don't know how much data to read, there's no guarantee
|
|
|
# that we can drain the request responsibly. The WSGI
|
|
|
# specification only says that servers *should* ensure the
|
|
|
# input stream doesn't overrun the actual request. So there's
|
|
|
# no guarantee that reading until EOF won't corrupt the stream
|
|
|
# state.
|
|
|
if not isinstance(self.req.bodyfh, util.cappedreader):
|
|
|
close = True
|
|
|
else:
|
|
|
# We /could/ only drain certain HTTP response codes. But 200
|
|
|
# and non-200 wire protocol responses both require draining.
|
|
|
# Since we have a capped reader in place for all situations
|
|
|
# where we drain, it is safe to read from that stream. We'll
|
|
|
# either do a drain or no-op if we're already at EOF.
|
|
|
drain = True
|
|
|
|
|
|
if close:
|
|
|
self.headers.append((r'Connection', r'Close'))
|
|
|
|
|
|
if drain:
|
|
|
assert isinstance(self.req.bodyfh, util.cappedreader)
|
|
|
while True:
|
|
|
chunk = self.req.bodyfh.read(32768)
|
|
|
if not chunk:
|
|
|
break
|
|
|
|
|
|
self.server_write = self._start_response(
|
|
|
pycompat.sysstr(status), self.headers)
|
|
|
self._start_response = None
|
|
|
self.headers = []
|
|
|
if body is not None:
|
|
|
self.write(body)
|
|
|
self.server_write = None
|
|
|
|
|
|
def write(self, thing):
|
|
|
if thing:
|
|
|
try:
|
|
|
self.server_write(thing)
|
|
|
except socket.error as inst:
|
|
|
if inst[0] != errno.ECONNRESET:
|
|
|
raise
|
|
|
|
|
|
def flush(self):
|
|
|
return None
|
|
|
|
|
|
def wsgiapplication(app_maker):
|
|
|
'''For compatibility with old CGI scripts. A plain hgweb() or hgwebdir()
|
|
|
can and should now be used as a WSGI application.'''
|
|
|
application = app_maker()
|
|
|
def run_wsgi(env, respond):
|
|
|
return application(env, respond)
|
|
|
return run_wsgi
|
|
|
|
