source: trunk/essentials/dev-lang/python/Lib/wsgiref/util.py@ 3951

"""Miscellaneous WSGI-related Utilities"""

import posixpath

__all__ = [
    'FileWrapper', 'guess_scheme', 'application_uri', 'request_uri',
    'shift_path_info', 'setup_testing_defaults',
]


class FileWrapper:
    """Wrapper to convert file-like objects to iterables"""

    def __init__(self, filelike, blksize=8192):
        self.filelike = filelike
        self.blksize = blksize
        if hasattr(filelike,'close'):
            self.close = filelike.close

    def __getitem__(self,key):
        data = self.filelike.read(self.blksize)
        if data:
            return data
        raise IndexError

    def __iter__(self):
        return self

    def next(self):
        data = self.filelike.read(self.blksize)
        if data:
            return data
        raise StopIteration








def guess_scheme(environ):
    """Return a guess for whether 'wsgi.url_scheme' should be 'http' or 'https'
    """
    if environ.get("HTTPS") in ('yes','on','1'):
        return 'https'
    else:
        return 'http'

def application_uri(environ):
    """Return the application's base URI (no PATH_INFO or QUERY_STRING)"""
    url = environ['wsgi.url_scheme']+'://'
    from urllib import quote

    if environ.get('HTTP_HOST'):
        url += environ['HTTP_HOST']
    else:
        url += environ['SERVER_NAME']