symbian-qemu-0.9.1-12/python-win32-2.6.1/lib/wsgiref/headers.py
author martin.trojer@nokia.com
Fri, 31 Jul 2009 15:01:17 +0100
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"""Manage HTTP Response Headers
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Much of this module is red-handedly pilfered from email.Message in the stdlib,
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so portions are Copyright (C) 2001,2002 Python Software Foundation, and were
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written by Barry Warsaw.
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"""
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from types import ListType, TupleType
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# Regular expression that matches `special' characters in parameters, the
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# existance of which force quoting of the parameter value.
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import re
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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:
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    """Manage a collection of HTTP response headers"""
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    def __init__(self,headers):
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        if type(headers) is not ListType:
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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(%r)" % 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
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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        value is None, in which case only the key will be added.
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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        Example:
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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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
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   178
        *not* handle '(charset, language, value)' tuples: all values must be
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        strings or None.
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        """
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   181
        parts = []
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   182
        if _value is not None:
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   183
            parts.append(_value)
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   184
        for k, v in _params.items():
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   185
            if v is None:
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   186
                parts.append(k.replace('_', '-'))
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   187
            else:
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   188
                parts.append(_formatparam(k.replace('_', '-'), v))
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   189
        self._headers.append((_name, "; ".join(parts)))
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#