699 lines
25 KiB
Python
699 lines
25 KiB
Python
"""
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BaseHTTPServer that implements the Python WSGI protocol (PEP 333, rev 1.21).
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Adapted from wsgiref.simple_server: http://svn.eby-sarna.com/wsgiref/
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This is a simple server for use in testing or debugging Django apps. It hasn't
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been reviewed for security issues. Don't use it for production use.
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"""
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from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
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import mimetypes
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import os
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import re
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import stat
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import sys
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import urllib
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from django.utils.http import http_date
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from django.utils._os import safe_join
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__version__ = "0.1"
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__all__ = ['WSGIServer','WSGIRequestHandler']
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server_version = "WSGIServer/" + __version__
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sys_version = "Python/" + sys.version.split()[0]
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software_version = server_version + ' ' + sys_version
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class WSGIServerException(Exception):
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pass
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class FileWrapper(object):
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"""Wrapper to convert file-like objects to iterables"""
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def __init__(self, filelike, blksize=8192):
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self.filelike = filelike
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self.blksize = blksize
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if hasattr(filelike,'close'):
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self.close = filelike.close
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def __getitem__(self,key):
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data = self.filelike.read(self.blksize)
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if data:
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return data
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raise IndexError
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def __iter__(self):
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return self
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def next(self):
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data = self.filelike.read(self.blksize)
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if data:
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return data
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raise StopIteration
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# Regular expression that matches `special' characters in parameters, the
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# existence of which force quoting of the parameter value.
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tspecials = re.compile(r'[ \(\)<>@,;:\\"/\[\]\?=]')
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def _formatparam(param, value=None, quote=1):
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"""Convenience function to format and return a key=value pair.
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This will quote the value if needed or if quote is true.
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"""
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if value is not None and len(value) > 0:
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if quote or tspecials.search(value):
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value = value.replace('\\', '\\\\').replace('"', r'\"')
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return '%s="%s"' % (param, value)
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else:
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return '%s=%s' % (param, value)
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else:
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return param
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class Headers(object):
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"""Manage a collection of HTTP response headers"""
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def __init__(self,headers):
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if not isinstance(headers, list):
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raise TypeError("Headers must be a list of name/value tuples")
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self._headers = headers
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def __len__(self):
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"""Return the total number of headers, including duplicates."""
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return len(self._headers)
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def __setitem__(self, name, val):
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"""Set the value of a header."""
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del self[name]
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self._headers.append((name, val))
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def __delitem__(self,name):
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"""Delete all occurrences of a header, if present.
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Does *not* raise an exception if the header is missing.
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"""
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name = name.lower()
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self._headers[:] = [kv for kv in self._headers if kv[0].lower()<>name]
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def __getitem__(self,name):
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"""Get the first header value for 'name'
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Return None if the header is missing instead of raising an exception.
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Note that if the header appeared multiple times, the first exactly which
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occurrance gets returned is undefined. Use getall() to get all
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the values matching a header field name.
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"""
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return self.get(name)
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def has_key(self, name):
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"""Return true if the message contains the header."""
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return self.get(name) is not None
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__contains__ = has_key
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def get_all(self, name):
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"""Return a list of all the values for the named field.
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These will be sorted in the order they appeared in the original header
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list or were added to this instance, and may contain duplicates. Any
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fields deleted and re-inserted are always appended to the header list.
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If no fields exist with the given name, returns an empty list.
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"""
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name = name.lower()
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return [kv[1] for kv in self._headers if kv[0].lower()==name]
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def get(self,name,default=None):
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"""Get the first header value for 'name', or return 'default'"""
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name = name.lower()
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for k,v in self._headers:
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if k.lower()==name:
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return v
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return default
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def keys(self):
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"""Return a list of all the header field names.
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These will be sorted in the order they appeared in the original header
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list, or were added to this instance, and may contain duplicates.
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Any fields deleted and re-inserted are always appended to the header
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list.
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"""
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return [k for k, v in self._headers]
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def values(self):
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"""Return a list of all header values.
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These will be sorted in the order they appeared in the original header
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list, or were added to this instance, and may contain duplicates.
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Any fields deleted and re-inserted are always appended to the header
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list.
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"""
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return [v for k, v in self._headers]
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def items(self):
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"""Get all the header fields and values.
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These will be sorted in the order they were in the original header
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list, or were added to this instance, and may contain duplicates.
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Any fields deleted and re-inserted are always appended to the header
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list.
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"""
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return self._headers[:]
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def __repr__(self):
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return "Headers(%s)" % `self._headers`
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def __str__(self):
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"""str() returns the formatted headers, complete with end line,
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suitable for direct HTTP transmission."""
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return '\r\n'.join(["%s: %s" % kv for kv in self._headers]+['',''])
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def setdefault(self,name,value):
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"""Return first matching header value for 'name', or 'value'
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If there is no header named 'name', add a new header with name 'name'
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and value 'value'."""
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result = self.get(name)
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if result is None:
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self._headers.append((name,value))
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return value
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else:
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return result
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def add_header(self, _name, _value, **_params):
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"""Extended header setting.
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_name is the header field to add. keyword arguments can be used to set
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additional parameters for the header field, with underscores converted
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to dashes. Normally the parameter will be added as key="value" unless
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value is None, in which case only the key will be added.
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Example:
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h.add_header('content-disposition', 'attachment', filename='bud.gif')
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Note that unlike the corresponding 'email.Message' method, this does
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*not* handle '(charset, language, value)' tuples: all values must be
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strings or None.
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"""
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parts = []
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if _value is not None:
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parts.append(_value)
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for k, v in _params.items():
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if v is None:
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parts.append(k.replace('_', '-'))
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else:
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parts.append(_formatparam(k.replace('_', '-'), v))
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self._headers.append((_name, "; ".join(parts)))
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def guess_scheme(environ):
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"""Return a guess for whether 'wsgi.url_scheme' should be 'http' or 'https'
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"""
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if environ.get("HTTPS") in ('yes','on','1'):
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return 'https'
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else:
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return 'http'
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_hop_headers = {
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'connection':1, 'keep-alive':1, 'proxy-authenticate':1,
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'proxy-authorization':1, 'te':1, 'trailers':1, 'transfer-encoding':1,
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'upgrade':1
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}
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def is_hop_by_hop(header_name):
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"""Return true if 'header_name' is an HTTP/1.1 "Hop-by-Hop" header"""
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return header_name.lower() in _hop_headers
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class ServerHandler(object):
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"""Manage the invocation of a WSGI application"""
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# Configuration parameters; can override per-subclass or per-instance
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wsgi_version = (1,0)
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wsgi_multithread = True
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wsgi_multiprocess = True
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wsgi_run_once = False
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origin_server = True # We are transmitting direct to client
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http_version = "1.0" # Version that should be used for response
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server_software = software_version
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# os_environ is used to supply configuration from the OS environment:
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# by default it's a copy of 'os.environ' as of import time, but you can
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# override this in e.g. your __init__ method.
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os_environ = dict(os.environ.items())
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# Collaborator classes
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wsgi_file_wrapper = FileWrapper # set to None to disable
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headers_class = Headers # must be a Headers-like class
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# Error handling (also per-subclass or per-instance)
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traceback_limit = None # Print entire traceback to self.get_stderr()
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error_status = "500 INTERNAL SERVER ERROR"
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error_headers = [('Content-Type','text/plain')]
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# State variables (don't mess with these)
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status = result = None
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headers_sent = False
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headers = None
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bytes_sent = 0
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def __init__(self, stdin, stdout, stderr, environ, multithread=True,
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multiprocess=False):
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self.stdin = stdin
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self.stdout = stdout
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self.stderr = stderr
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self.base_env = environ
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self.wsgi_multithread = multithread
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self.wsgi_multiprocess = multiprocess
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def run(self, application):
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"""Invoke the application"""
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# Note to self: don't move the close()! Asynchronous servers shouldn't
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# call close() from finish_response(), so if you close() anywhere but
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# the double-error branch here, you'll break asynchronous servers by
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# prematurely closing. Async servers must return from 'run()' without
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# closing if there might still be output to iterate over.
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try:
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self.setup_environ()
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self.result = application(self.environ, self.start_response)
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self.finish_response()
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except:
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try:
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self.handle_error()
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except:
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# If we get an error handling an error, just give up already!
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self.close()
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raise # ...and let the actual server figure it out.
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def setup_environ(self):
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"""Set up the environment for one request"""
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env = self.environ = self.os_environ.copy()
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self.add_cgi_vars()
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env['wsgi.input'] = self.get_stdin()
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env['wsgi.errors'] = self.get_stderr()
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env['wsgi.version'] = self.wsgi_version
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env['wsgi.run_once'] = self.wsgi_run_once
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env['wsgi.url_scheme'] = self.get_scheme()
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env['wsgi.multithread'] = self.wsgi_multithread
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env['wsgi.multiprocess'] = self.wsgi_multiprocess
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if self.wsgi_file_wrapper is not None:
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env['wsgi.file_wrapper'] = self.wsgi_file_wrapper
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if self.origin_server and self.server_software:
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env.setdefault('SERVER_SOFTWARE',self.server_software)
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def finish_response(self):
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"""
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Send any iterable data, then close self and the iterable
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Subclasses intended for use in asynchronous servers will want to
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redefine this method, such that it sets up callbacks in the event loop
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to iterate over the data, and to call 'self.close()' once the response
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is finished.
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"""
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if not self.result_is_file() or not self.sendfile():
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for data in self.result:
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self.write(data)
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self.finish_content()
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self.close()
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def get_scheme(self):
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"""Return the URL scheme being used"""
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return guess_scheme(self.environ)
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def set_content_length(self):
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"""Compute Content-Length or switch to chunked encoding if possible"""
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try:
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blocks = len(self.result)
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except (TypeError, AttributeError, NotImplementedError):
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pass
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else:
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if blocks==1:
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self.headers['Content-Length'] = str(self.bytes_sent)
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return
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# XXX Try for chunked encoding if origin server and client is 1.1
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def cleanup_headers(self):
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"""Make any necessary header changes or defaults
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Subclasses can extend this to add other defaults.
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"""
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if 'Content-Length' not in self.headers:
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self.set_content_length()
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def start_response(self, status, headers,exc_info=None):
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"""'start_response()' callable as specified by PEP 333"""
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if exc_info:
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try:
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if self.headers_sent:
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# Re-raise original exception if headers sent
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raise exc_info[0], exc_info[1], exc_info[2]
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finally:
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exc_info = None # avoid dangling circular ref
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elif self.headers is not None:
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raise AssertionError("Headers already set!")
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assert isinstance(status, str),"Status must be a string"
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assert len(status)>=4,"Status must be at least 4 characters"
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assert int(status[:3]),"Status message must begin w/3-digit code"
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assert status[3]==" ", "Status message must have a space after code"
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if __debug__:
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for name,val in headers:
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assert isinstance(name, str),"Header names must be strings"
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assert isinstance(val, str),"Header values must be strings"
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assert not is_hop_by_hop(name),"Hop-by-hop headers not allowed"
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self.status = status
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self.headers = self.headers_class(headers)
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return self.write
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def send_preamble(self):
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"""Transmit version/status/date/server, via self._write()"""
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if self.origin_server:
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if self.client_is_modern():
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self._write('HTTP/%s %s\r\n' % (self.http_version,self.status))
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if 'Date' not in self.headers:
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self._write(
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'Date: %s\r\n' % http_date()
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)
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if self.server_software and 'Server' not in self.headers:
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self._write('Server: %s\r\n' % self.server_software)
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else:
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self._write('Status: %s\r\n' % self.status)
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def write(self, data):
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"""'write()' callable as specified by PEP 333"""
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assert isinstance(data, str), "write() argument must be string"
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if not self.status:
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raise AssertionError("write() before start_response()")
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elif not self.headers_sent:
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# Before the first output, send the stored headers
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self.bytes_sent = len(data) # make sure we know content-length
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self.send_headers()
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else:
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self.bytes_sent += len(data)
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# XXX check Content-Length and truncate if too many bytes written?
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# If data is too large, socket will choke, so write chunks no larger
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# than 32MB at a time.
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length = len(data)
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if length > 33554432:
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offset = 0
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while offset < length:
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chunk_size = min(33554432, length)
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self._write(data[offset:offset+chunk_size])
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self._flush()
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offset += chunk_size
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else:
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self._write(data)
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self._flush()
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def sendfile(self):
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"""Platform-specific file transmission
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Override this method in subclasses to support platform-specific
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file transmission. It is only called if the application's
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return iterable ('self.result') is an instance of
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'self.wsgi_file_wrapper'.
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This method should return a true value if it was able to actually
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transmit the wrapped file-like object using a platform-specific
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approach. It should return a false value if normal iteration
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should be used instead. An exception can be raised to indicate
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that transmission was attempted, but failed.
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NOTE: this method should call 'self.send_headers()' if
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'self.headers_sent' is false and it is going to attempt direct
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transmission of the file1.
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"""
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return False # No platform-specific transmission by default
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def finish_content(self):
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"""Ensure headers and content have both been sent"""
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if not self.headers_sent:
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self.headers['Content-Length'] = "0"
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self.send_headers()
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else:
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pass # XXX check if content-length was too short?
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def close(self):
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try:
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self.request_handler.log_request(self.status.split(' ',1)[0], self.bytes_sent)
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finally:
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try:
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if hasattr(self.result,'close'):
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self.result.close()
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finally:
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self.result = self.headers = self.status = self.environ = None
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self.bytes_sent = 0; self.headers_sent = False
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def send_headers(self):
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"""Transmit headers to the client, via self._write()"""
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self.cleanup_headers()
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self.headers_sent = True
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if not self.origin_server or self.client_is_modern():
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self.send_preamble()
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self._write(str(self.headers))
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def result_is_file(self):
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"""True if 'self.result' is an instance of 'self.wsgi_file_wrapper'"""
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wrapper = self.wsgi_file_wrapper
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return wrapper is not None and isinstance(self.result,wrapper)
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def client_is_modern(self):
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"""True if client can accept status and headers"""
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return self.environ['SERVER_PROTOCOL'].upper() != 'HTTP/0.9'
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def log_exception(self,exc_info):
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"""Log the 'exc_info' tuple in the server log
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Subclasses may override to retarget the output or change its format.
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"""
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try:
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from traceback import print_exception
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stderr = self.get_stderr()
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print_exception(
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exc_info[0], exc_info[1], exc_info[2],
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self.traceback_limit, stderr
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)
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stderr.flush()
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finally:
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exc_info = None
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def handle_error(self):
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"""Log current error, and send error output to client if possible"""
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self.log_exception(sys.exc_info())
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if not self.headers_sent:
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self.result = self.error_output(self.environ, self.start_response)
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self.finish_response()
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# XXX else: attempt advanced recovery techniques for HTML or text?
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def error_output(self, environ, start_response):
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import traceback
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start_response(self.error_status, self.error_headers[:], sys.exc_info())
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return ['\n'.join(traceback.format_exception(*sys.exc_info()))]
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# Pure abstract methods; *must* be overridden in subclasses
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def _write(self,data):
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self.stdout.write(data)
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self._write = self.stdout.write
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def _flush(self):
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self.stdout.flush()
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self._flush = self.stdout.flush
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def get_stdin(self):
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return self.stdin
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def get_stderr(self):
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return self.stderr
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def add_cgi_vars(self):
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self.environ.update(self.base_env)
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class WSGIServer(HTTPServer):
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"""BaseHTTPServer that implements the Python WSGI protocol"""
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application = None
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def server_bind(self):
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"""Override server_bind to store the server name."""
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try:
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HTTPServer.server_bind(self)
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except Exception, e:
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raise WSGIServerException, e
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self.setup_environ()
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def setup_environ(self):
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# Set up base environment
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env = self.base_environ = {}
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env['SERVER_NAME'] = self.server_name
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env['GATEWAY_INTERFACE'] = 'CGI/1.1'
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env['SERVER_PORT'] = str(self.server_port)
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env['REMOTE_HOST']=''
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env['CONTENT_LENGTH']=''
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env['SCRIPT_NAME'] = ''
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def get_app(self):
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return self.application
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def set_app(self,application):
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self.application = application
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class WSGIRequestHandler(BaseHTTPRequestHandler):
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server_version = "WSGIServer/" + __version__
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def __init__(self, *args, **kwargs):
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from django.conf import settings
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self.admin_media_prefix = settings.ADMIN_MEDIA_PREFIX
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# We set self.path to avoid crashes in log_message() on unsupported
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# requests (like "OPTIONS").
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self.path = ''
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BaseHTTPRequestHandler.__init__(self, *args, **kwargs)
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def get_environ(self):
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env = self.server.base_environ.copy()
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env['SERVER_PROTOCOL'] = self.request_version
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env['REQUEST_METHOD'] = self.command
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if '?' in self.path:
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path,query = self.path.split('?',1)
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else:
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path,query = self.path,''
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env['PATH_INFO'] = urllib.unquote(path)
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env['QUERY_STRING'] = query
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env['REMOTE_ADDR'] = self.client_address[0]
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if self.headers.typeheader is None:
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env['CONTENT_TYPE'] = self.headers.type
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else:
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env['CONTENT_TYPE'] = self.headers.typeheader
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length = self.headers.getheader('content-length')
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if length:
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env['CONTENT_LENGTH'] = length
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for h in self.headers.headers:
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k,v = h.split(':',1)
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k=k.replace('-','_').upper(); v=v.strip()
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if k in env:
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continue # skip content length, type,etc.
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if 'HTTP_'+k in env:
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env['HTTP_'+k] += ','+v # comma-separate multiple headers
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else:
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env['HTTP_'+k] = v
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return env
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def get_stderr(self):
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return sys.stderr
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def handle(self):
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"""Handle a single HTTP request"""
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self.raw_requestline = self.rfile.readline()
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if not self.parse_request(): # An error code has been sent, just exit
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return
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handler = ServerHandler(self.rfile, self.wfile, self.get_stderr(), self.get_environ())
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handler.request_handler = self # backpointer for logging
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handler.run(self.server.get_app())
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def log_message(self, format, *args):
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# Don't bother logging requests for admin images or the favicon.
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if self.path.startswith(self.admin_media_prefix) or self.path == '/favicon.ico':
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return
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sys.stderr.write("[%s] %s\n" % (self.log_date_time_string(), format % args))
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class AdminMediaHandler(object):
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"""
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WSGI middleware that intercepts calls to the admin media directory, as
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defined by the ADMIN_MEDIA_PREFIX setting, and serves those images.
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Use this ONLY LOCALLY, for development! This hasn't been tested for
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security and is not super efficient.
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"""
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def __init__(self, application, media_dir=None):
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from django.conf import settings
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self.application = application
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if not media_dir:
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import django
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self.media_dir = \
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os.path.join(django.__path__[0], 'contrib', 'admin', 'media')
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else:
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self.media_dir = media_dir
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self.media_url = settings.ADMIN_MEDIA_PREFIX
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def file_path(self, url):
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"""
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Returns the path to the media file on disk for the given URL.
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The passed URL is assumed to begin with ADMIN_MEDIA_PREFIX. If the
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resultant file path is outside the media directory, then a ValueError
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is raised.
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"""
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# Remove ADMIN_MEDIA_PREFIX.
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relative_url = url[len(self.media_url):]
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relative_path = urllib.url2pathname(relative_url)
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return safe_join(self.media_dir, relative_path)
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def __call__(self, environ, start_response):
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import os.path
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# Ignore requests that aren't under ADMIN_MEDIA_PREFIX. Also ignore
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# all requests if ADMIN_MEDIA_PREFIX isn't a relative URL.
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if self.media_url.startswith('http://') or self.media_url.startswith('https://') \
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or not environ['PATH_INFO'].startswith(self.media_url):
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return self.application(environ, start_response)
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# Find the admin file and serve it up, if it exists and is readable.
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try:
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file_path = self.file_path(environ['PATH_INFO'])
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except ValueError: # Resulting file path was not valid.
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status = '404 NOT FOUND'
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headers = {'Content-type': 'text/plain'}
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output = ['Page not found: %s' % environ['PATH_INFO']]
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start_response(status, headers.items())
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return output
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if not os.path.exists(file_path):
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status = '404 NOT FOUND'
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headers = {'Content-type': 'text/plain'}
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output = ['Page not found: %s' % environ['PATH_INFO']]
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else:
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try:
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fp = open(file_path, 'rb')
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except IOError:
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status = '401 UNAUTHORIZED'
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headers = {'Content-type': 'text/plain'}
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output = ['Permission denied: %s' % environ['PATH_INFO']]
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else:
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# This is a very simple implementation of conditional GET with
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# the Last-Modified header. It makes media files a bit speedier
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# because the files are only read off disk for the first
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# request (assuming the browser/client supports conditional
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# GET).
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mtime = http_date(os.stat(file_path)[stat.ST_MTIME])
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headers = {'Last-Modified': mtime}
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if environ.get('HTTP_IF_MODIFIED_SINCE', None) == mtime:
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status = '304 NOT MODIFIED'
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output = []
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else:
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status = '200 OK'
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mime_type = mimetypes.guess_type(file_path)[0]
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if mime_type:
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headers['Content-Type'] = mime_type
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output = [fp.read()]
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fp.close()
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start_response(status, headers.items())
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return output
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def run(addr, port, wsgi_handler):
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server_address = (addr, port)
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httpd = WSGIServer(server_address, WSGIRequestHandler)
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httpd.set_app(wsgi_handler)
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httpd.serve_forever()
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