2014-06-06 04:24:43 +00:00
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"""HTTP library functions."""
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2014-03-10 05:18:05 +00:00
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2014-06-06 04:24:43 +00:00
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# This module contains functions for building an HTTP application
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# framework: any one, not just one whose name starts with "Ch". ;) If you
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# reference any modules from some popular framework inside *this* module,
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# FuManChu will personally hang you up by your thumbs and submit you
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# to a public caning.
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2014-03-10 05:18:05 +00:00
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from binascii import b2a_base64
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2014-06-06 04:24:43 +00:00
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from BaseHTTPServer import BaseHTTPRequestHandler
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2014-03-10 05:18:05 +00:00
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response_codes = BaseHTTPRequestHandler.responses.copy()
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2014-06-06 04:24:43 +00:00
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# From http://www.cherrypy.org/ticket/361
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2014-03-10 05:18:05 +00:00
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response_codes[500] = ('Internal Server Error',
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2014-06-06 04:24:43 +00:00
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'The server encountered an unexpected condition '
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'which prevented it from fulfilling the request.')
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2014-03-10 05:18:05 +00:00
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response_codes[503] = ('Service Unavailable',
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2014-06-06 04:24:43 +00:00
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'The server is currently unable to handle the '
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'request due to a temporary overloading or '
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'maintenance of the server.')
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2014-03-10 05:18:05 +00:00
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import re
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import urllib
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2014-06-06 04:24:43 +00:00
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from rfc822 import formatdate as HTTPDate
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2014-03-10 05:18:05 +00:00
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2014-06-05 01:28:59 +00:00
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2014-06-06 04:24:43 +00:00
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def urljoin(*atoms):
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"""Return the given path *atoms, joined into a single URL.
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2014-03-10 05:18:05 +00:00
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This will correctly join a SCRIPT_NAME and PATH_INFO into the
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original URL, even if either atom is blank.
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"""
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url = "/".join([x for x in atoms if x])
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while "//" in url:
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url = url.replace("//", "/")
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# Special-case the final url of "", and return "/" instead.
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return url or "/"
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def protocol_from_http(protocol_str):
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"""Return a protocol tuple from the given 'HTTP/x.y' string."""
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return int(protocol_str[5]), int(protocol_str[7])
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def get_ranges(headervalue, content_length):
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"""Return a list of (start, stop) indices from a Range header, or None.
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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Each (start, stop) tuple will be composed of two ints, which are suitable
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for use in a slicing operation. That is, the header "Range: bytes=3-6",
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if applied against a Python string, is requesting resource[3:7]. This
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function will return the list [(3, 7)].
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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If this function returns an empty list, you should return HTTP 416.
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"""
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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if not headervalue:
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return None
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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result = []
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bytesunit, byteranges = headervalue.split("=", 1)
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for brange in byteranges.split(","):
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start, stop = [x.strip() for x in brange.split("-", 1)]
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if start:
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if not stop:
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stop = content_length - 1
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start, stop = int(start), int(stop)
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if start >= content_length:
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# From rfc 2616 sec 14.16:
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# "If the server receives a request (other than one
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# including an If-Range request-header field) with an
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# unsatisfiable Range request-header field (that is,
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# all of whose byte-range-spec values have a first-byte-pos
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# value greater than the current length of the selected
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# resource), it SHOULD return a response code of 416
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# (Requested range not satisfiable)."
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continue
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if stop < start:
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# From rfc 2616 sec 14.16:
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# "If the server ignores a byte-range-spec because it
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# is syntactically invalid, the server SHOULD treat
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# the request as if the invalid Range header field
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# did not exist. (Normally, this means return a 200
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# response containing the full entity)."
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return None
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result.append((start, stop + 1))
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else:
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if not stop:
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# See rfc quote above.
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return None
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# Negative subscript (last N bytes)
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result.append((content_length - int(stop), content_length))
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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return result
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class HeaderElement(object):
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"""An element (with parameters) from an HTTP header's element list."""
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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def __init__(self, value, params=None):
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self.value = value
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if params is None:
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params = {}
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self.params = params
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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def __cmp__(self, other):
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return cmp(self.value, other.value)
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2014-06-06 04:24:43 +00:00
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2014-06-05 01:28:59 +00:00
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def __unicode__(self):
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2014-06-06 04:24:43 +00:00
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p = [";%s=%s" % (k, v) for k, v in self.params.iteritems()]
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return u"%s%s" % (self.value, "".join(p))
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def __str__(self):
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return str(self.__unicode__())
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2014-03-10 05:18:05 +00:00
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def parse(elementstr):
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"""Transform 'token;key=val' to ('token', {'key': 'val'})."""
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# Split the element into a value and parameters. The 'value' may
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# be of the form, "token=token", but we don't split that here.
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atoms = [x.strip() for x in elementstr.split(";") if x.strip()]
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if not atoms:
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initial_value = ''
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else:
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initial_value = atoms.pop(0).strip()
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params = {}
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for atom in atoms:
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atom = [x.strip() for x in atom.split("=", 1) if x.strip()]
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key = atom.pop(0)
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if atom:
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val = atom[0]
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else:
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val = ""
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params[key] = val
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return initial_value, params
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parse = staticmethod(parse)
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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def from_str(cls, elementstr):
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"""Construct an instance from a string of the form 'token;key=val'."""
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ival, params = cls.parse(elementstr)
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return cls(ival, params)
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from_str = classmethod(from_str)
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q_separator = re.compile(r'; *q *=')
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class AcceptElement(HeaderElement):
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"""An element (with parameters) from an Accept* header's element list.
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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AcceptElement objects are comparable; the more-preferred object will be
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"less than" the less-preferred object. They are also therefore sortable;
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if you sort a list of AcceptElement objects, they will be listed in
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priority order; the most preferred value will be first. Yes, it should
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have been the other way around, but it's too late to fix now.
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"""
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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def from_str(cls, elementstr):
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qvalue = None
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# The first "q" parameter (if any) separates the initial
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# media-range parameter(s) (if any) from the accept-params.
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atoms = q_separator.split(elementstr, 1)
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media_range = atoms.pop(0).strip()
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if atoms:
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# The qvalue for an Accept header can have extensions. The other
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# headers cannot, but it's easier to parse them as if they did.
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qvalue = HeaderElement.from_str(atoms[0].strip())
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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media_type, params = cls.parse(media_range)
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if qvalue is not None:
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params["q"] = qvalue
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return cls(media_type, params)
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from_str = classmethod(from_str)
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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def qvalue(self):
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val = self.params.get("q", "1")
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if isinstance(val, HeaderElement):
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val = val.value
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return float(val)
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qvalue = property(qvalue, doc="The qvalue, or priority, of this value.")
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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def __cmp__(self, other):
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diff = cmp(self.qvalue, other.qvalue)
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if diff == 0:
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diff = cmp(str(self), str(other))
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return diff
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def header_elements(fieldname, fieldvalue):
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2014-06-06 04:24:43 +00:00
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"""Return a sorted HeaderElement list from a comma-separated header str."""
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2014-03-10 05:18:05 +00:00
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if not fieldvalue:
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return []
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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result = []
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2014-06-06 04:24:43 +00:00
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for element in fieldvalue.split(","):
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2014-03-10 05:18:05 +00:00
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if fieldname.startswith("Accept") or fieldname == 'TE':
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hv = AcceptElement.from_str(element)
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else:
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hv = HeaderElement.from_str(element)
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result.append(hv)
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2014-06-06 04:24:43 +00:00
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result.sort()
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result.reverse()
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return result
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2014-03-10 05:18:05 +00:00
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def decode_TEXT(value):
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2014-06-06 04:24:43 +00:00
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"""Decode RFC-2047 TEXT (e.g. "=?utf-8?q?f=C3=BCr?=" -> u"f\xfcr")."""
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from email.Header import decode_header
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2014-03-10 05:18:05 +00:00
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atoms = decode_header(value)
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decodedvalue = ""
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for atom, charset in atoms:
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if charset is not None:
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atom = atom.decode(charset)
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decodedvalue += atom
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return decodedvalue
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def valid_status(status):
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"""Return legal HTTP status Code, Reason-phrase and Message.
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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The status arg must be an int, or a str that begins with an int.
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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If status is an int, or a str and no reason-phrase is supplied,
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a default reason-phrase will be provided.
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"""
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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if not status:
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status = 200
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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status = str(status)
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parts = status.split(" ", 1)
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if len(parts) == 1:
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# No reason supplied.
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code, = parts
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reason = None
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else:
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code, reason = parts
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reason = reason.strip()
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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try:
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code = int(code)
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except ValueError:
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raise ValueError("Illegal response status from server "
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"(%s is non-numeric)." % repr(code))
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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if code < 100 or code > 599:
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raise ValueError("Illegal response status from server "
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"(%s is out of range)." % repr(code))
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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if code not in response_codes:
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# code is unknown but not illegal
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default_reason, message = "", ""
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else:
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default_reason, message = response_codes[code]
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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if reason is None:
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reason = default_reason
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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return code, reason, message
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def _parse_qs(qs, keep_blank_values=0, strict_parsing=0, encoding='utf-8'):
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"""Parse a query given as a string argument.
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Arguments:
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qs: URL-encoded query string to be parsed
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keep_blank_values: flag indicating whether blank values in
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URL encoded queries should be treated as blank strings. A
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true value indicates that blanks should be retained as blank
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strings. The default false value indicates that blank values
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are to be ignored and treated as if they were not included.
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strict_parsing: flag indicating what to do with parsing errors. If
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false (the default), errors are silently ignored. If true,
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errors raise a ValueError exception.
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Returns a dict, as G-d intended.
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"""
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pairs = [s2 for s1 in qs.split('&') for s2 in s1.split(';')]
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d = {}
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for name_value in pairs:
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if not name_value and not strict_parsing:
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continue
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nv = name_value.split('=', 1)
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if len(nv) != 2:
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if strict_parsing:
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raise ValueError("bad query field: %r" % (name_value,))
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# Handle case of a control-name with no equal sign
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if keep_blank_values:
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nv.append('')
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else:
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continue
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if len(nv[1]) or keep_blank_values:
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2014-06-06 04:24:43 +00:00
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name = urllib.unquote(nv[0].replace('+', ' '))
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name = name.decode(encoding, 'strict')
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value = urllib.unquote(nv[1].replace('+', ' '))
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value = value.decode(encoding, 'strict')
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2014-03-10 05:18:05 +00:00
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if name in d:
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if not isinstance(d[name], list):
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d[name] = [d[name]]
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d[name].append(value)
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else:
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d[name] = value
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return d
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image_map_pattern = re.compile(r"[0-9]+,[0-9]+")
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def parse_query_string(query_string, keep_blank_values=True, encoding='utf-8'):
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"""Build a params dictionary from a query_string.
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2014-06-06 04:24:43 +00:00
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2014-03-10 05:18:05 +00:00
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Duplicate key/value pairs in the provided query_string will be
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returned as {'key': [val1, val2, ...]}. Single key/values will
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be returned as strings: {'key': 'value'}.
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"""
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if image_map_pattern.match(query_string):
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# Server-side image map. Map the coords to 'x' and 'y'
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# (like CGI::Request does).
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pm = query_string.split(",")
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pm = {'x': int(pm[0]), 'y': int(pm[1])}
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else:
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pm = _parse_qs(query_string, keep_blank_values, encoding=encoding)
|
|
|
|
return pm
|
|
|
|
|
|
|
|
|
|
|
|
class CaseInsensitiveDict(dict):
|
|
|
|
"""A case-insensitive dict subclass.
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
Each key is changed on entry to str(key).title().
|
|
|
|
"""
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def __getitem__(self, key):
|
|
|
|
return dict.__getitem__(self, str(key).title())
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def __setitem__(self, key, value):
|
|
|
|
dict.__setitem__(self, str(key).title(), value)
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def __delitem__(self, key):
|
|
|
|
dict.__delitem__(self, str(key).title())
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def __contains__(self, key):
|
|
|
|
return dict.__contains__(self, str(key).title())
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def get(self, key, default=None):
|
|
|
|
return dict.get(self, str(key).title(), default)
|
2014-06-06 04:24:43 +00:00
|
|
|
|
|
|
|
def has_key(self, key):
|
|
|
|
return dict.has_key(self, str(key).title())
|
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def update(self, E):
|
|
|
|
for k in E.keys():
|
|
|
|
self[str(k).title()] = E[k]
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def fromkeys(cls, seq, value=None):
|
|
|
|
newdict = cls()
|
|
|
|
for k in seq:
|
|
|
|
newdict[str(k).title()] = value
|
|
|
|
return newdict
|
|
|
|
fromkeys = classmethod(fromkeys)
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def setdefault(self, key, x=None):
|
|
|
|
key = str(key).title()
|
|
|
|
try:
|
|
|
|
return self[key]
|
|
|
|
except KeyError:
|
|
|
|
self[key] = x
|
|
|
|
return x
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def pop(self, key, default):
|
|
|
|
return dict.pop(self, str(key).title(), default)
|
|
|
|
|
|
|
|
|
|
|
|
class HeaderMap(CaseInsensitiveDict):
|
|
|
|
"""A dict subclass for HTTP request and response headers.
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
Each key is changed on entry to str(key).title(). This allows headers
|
|
|
|
to be case-insensitive and avoid duplicates.
|
2014-06-06 04:24:43 +00:00
|
|
|
|
|
|
|
Values are header values (decoded according to RFC 2047 if necessary).
|
2014-03-10 05:18:05 +00:00
|
|
|
"""
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
protocol = (1, 1)
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def elements(self, key):
|
|
|
|
"""Return a sorted list of HeaderElements for the given header."""
|
|
|
|
key = str(key).title()
|
|
|
|
value = self.get(key)
|
|
|
|
return header_elements(key, value)
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def values(self, key):
|
|
|
|
"""Return a sorted list of HeaderElement.value for the given header."""
|
|
|
|
return [e.value for e in self.elements(key)]
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def output(self):
|
|
|
|
"""Transform self into a list of (name, value) tuples."""
|
2014-06-06 04:24:43 +00:00
|
|
|
header_list = []
|
|
|
|
for k, v in self.items():
|
|
|
|
if isinstance(k, unicode):
|
|
|
|
k = k.encode("ISO-8859-1")
|
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
if not isinstance(v, basestring):
|
|
|
|
v = str(v)
|
2014-06-06 04:24:43 +00:00
|
|
|
|
|
|
|
if isinstance(v, unicode):
|
|
|
|
v = self.encode(v)
|
|
|
|
header_list.append((k, v))
|
|
|
|
return header_list
|
|
|
|
|
|
|
|
def encode(self, v):
|
|
|
|
"""Return the given header value, encoded for HTTP output."""
|
|
|
|
# HTTP/1.0 says, "Words of *TEXT may contain octets
|
|
|
|
# from character sets other than US-ASCII." and
|
|
|
|
# "Recipients of header field TEXT containing octets
|
|
|
|
# outside the US-ASCII character set may assume that
|
|
|
|
# they represent ISO-8859-1 characters."
|
|
|
|
try:
|
|
|
|
v = v.encode("ISO-8859-1")
|
|
|
|
except UnicodeEncodeError:
|
|
|
|
if self.protocol == (1, 1):
|
|
|
|
# Encode RFC-2047 TEXT
|
|
|
|
# (e.g. u"\u8200" -> "=?utf-8?b?6IiA?=").
|
|
|
|
# We do our own here instead of using the email module
|
|
|
|
# because we never want to fold lines--folding has
|
|
|
|
# been deprecated by the HTTP working group.
|
|
|
|
v = b2a_base64(v.encode('utf-8'))
|
|
|
|
v = ('=?utf-8?b?' + v.strip('\n') + '?=')
|
|
|
|
else:
|
|
|
|
raise
|
|
|
|
return v
|
2014-03-10 05:18:05 +00:00
|
|
|
|
|
|
|
class Host(object):
|
|
|
|
"""An internet address.
|
2014-06-06 04:24:43 +00:00
|
|
|
|
|
|
|
name should be the client's host name. If not available (because no DNS
|
2014-03-10 05:18:05 +00:00
|
|
|
lookup is performed), the IP address should be used instead.
|
|
|
|
"""
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
ip = "0.0.0.0"
|
|
|
|
port = 80
|
|
|
|
name = "unknown.tld"
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def __init__(self, ip, port, name=None):
|
|
|
|
self.ip = ip
|
|
|
|
self.port = port
|
|
|
|
if name is None:
|
|
|
|
name = ip
|
|
|
|
self.name = name
|
2014-06-06 04:24:43 +00:00
|
|
|
|
2014-03-10 05:18:05 +00:00
|
|
|
def __repr__(self):
|
|
|
|
return "httputil.Host(%r, %r, %r)" % (self.ip, self.port, self.name)
|