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server/libreoffice/program/python-core-3.8.8/lib/wsgiref/__init__.py

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+"""wsgiref -- a WSGI (PEP 3333) Reference Library
+
+Current Contents:
+
+* util -- Miscellaneous useful functions and wrappers
+
+* headers -- Manage response headers
+
+* handlers -- base classes for server/gateway implementations
+
+* simple_server -- a simple BaseHTTPServer that supports WSGI
+
+* validate -- validation wrapper that sits between an app and a server
+  to detect errors in either
+
+To-Do:
+
+* cgi_gateway -- Run WSGI apps under CGI (pending a deployment standard)
+
+* cgi_wrapper -- Run CGI apps under WSGI
+
+* router -- a simple middleware component that handles URL traversal
+"""

server/libreoffice/program/python-core-3.8.8/lib/wsgiref/headers.py

@@ -0,0 +1,184 @@
+"""Manage HTTP Response Headers
+
+Much of this module is red-handedly pilfered from email.message in the stdlib,
+so portions are Copyright (C) 2001,2002 Python Software Foundation, and were
+written by Barry Warsaw.
+"""
+
+# Regular expression that matches `special' characters in parameters, the
+# existence of which force quoting of the parameter value.
+import re
+tspecials = re.compile(r'[ \(\)<>@,;:\\"/\[\]\?=]')
+
+def _formatparam(param, value=None, quote=1):
+    """Convenience function to format and return a key=value pair.
+
+    This will quote the value if needed or if quote is true.
+    """
+    if value is not None and len(value) > 0:
+        if quote or tspecials.search(value):
+            value = value.replace('\\', '\\\\').replace('"', r'\"')
+            return '%s="%s"' % (param, value)
+        else:
+            return '%s=%s' % (param, value)
+    else:
+        return param
+
+
+class Headers:
+    """Manage a collection of HTTP response headers"""
+
+    def __init__(self, headers=None):
+        headers = headers if headers is not None else []
+        if type(headers) is not list:
+            raise TypeError("Headers must be a list of name/value tuples")
+        self._headers = headers
+        if __debug__:
+            for k, v in headers:
+                self._convert_string_type(k)
+                self._convert_string_type(v)
+
+    def _convert_string_type(self, value):
+        """Convert/check value type."""
+        if type(value) is str:
+            return value
+        raise AssertionError("Header names/values must be"
+            " of type str (got {0})".format(repr(value)))
+
+    def __len__(self):
+        """Return the total number of headers, including duplicates."""
+        return len(self._headers)
+
+    def __setitem__(self, name, val):
+        """Set the value of a header."""
+        del self[name]
+        self._headers.append(
+            (self._convert_string_type(name), self._convert_string_type(val)))
+
+    def __delitem__(self,name):
+        """Delete all occurrences of a header, if present.
+
+        Does *not* raise an exception if the header is missing.
+        """
+        name = self._convert_string_type(name.lower())
+        self._headers[:] = [kv for kv in self._headers if kv[0].lower() != name]
+
+    def __getitem__(self,name):
+        """Get the first header value for 'name'
+
+        Return None if the header is missing instead of raising an exception.
+
+        Note that if the header appeared multiple times, the first exactly which
+        occurrence gets returned is undefined.  Use getall() to get all
+        the values matching a header field name.
+        """
+        return self.get(name)
+
+    def __contains__(self, name):
+        """Return true if the message contains the header."""
+        return self.get(name) is not None
+
+
+    def get_all(self, name):
+        """Return a list of all the values for the named field.
+
+        These will be sorted in the order they appeared in the original header
+        list or were added to this instance, and may contain duplicates.  Any
+        fields deleted and re-inserted are always appended to the header list.
+        If no fields exist with the given name, returns an empty list.
+        """
+        name = self._convert_string_type(name.lower())
+        return [kv[1] for kv in self._headers if kv[0].lower()==name]
+
+
+    def get(self,name,default=None):
+        """Get the first header value for 'name', or return 'default'"""
+        name = self._convert_string_type(name.lower())
+        for k,v in self._headers:
+            if k.lower()==name:
+                return v
+        return default
+
+
+    def keys(self):
+        """Return a list of all the header field names.
+
+        These will be sorted in the order they appeared in the original header
+        list, or were added to this instance, and may contain duplicates.
+        Any fields deleted and re-inserted are always appended to the header
+        list.
+        """
+        return [k for k, v in self._headers]
+
+    def values(self):
+        """Return a list of all header values.
+
+        These will be sorted in the order they appeared in the original header
+        list, or were added to this instance, and may contain duplicates.
+        Any fields deleted and re-inserted are always appended to the header
+        list.
+        """
+        return [v for k, v in self._headers]
+
+    def items(self):
+        """Get all the header fields and values.
+
+        These will be sorted in the order they were in the original header
+        list, or were added to this instance, and may contain duplicates.
+        Any fields deleted and re-inserted are always appended to the header
+        list.
+        """
+        return self._headers[:]
+
+    def __repr__(self):
+        return "%s(%r)" % (self.__class__.__name__, self._headers)
+
+    def __str__(self):
+        """str() returns the formatted headers, complete with end line,
+        suitable for direct HTTP transmission."""
+        return '\r\n'.join(["%s: %s" % kv for kv in self._headers]+['',''])
+
+    def __bytes__(self):
+        return str(self).encode('iso-8859-1')
+
+    def setdefault(self,name,value):
+        """Return first matching header value for 'name', or 'value'
+
+        If there is no header named 'name', add a new header with name 'name'
+        and value 'value'."""
+        result = self.get(name)
+        if result is None:
+            self._headers.append((self._convert_string_type(name),
+                self._convert_string_type(value)))
+            return value
+        else:
+            return result
+
+    def add_header(self, _name, _value, **_params):
+        """Extended header setting.
+
+        _name is the header field to add.  keyword arguments can be used to set
+        additional parameters for the header field, with underscores converted
+        to dashes.  Normally the parameter will be added as key="value" unless
+        value is None, in which case only the key will be added.
+
+        Example:
+
+        h.add_header('content-disposition', 'attachment', filename='bud.gif')
+
+        Note that unlike the corresponding 'email.message' method, this does
+        *not* handle '(charset, language, value)' tuples: all values must be
+        strings or None.
+        """
+        parts = []
+        if _value is not None:
+            _value = self._convert_string_type(_value)
+            parts.append(_value)
+        for k, v in _params.items():
+            k = self._convert_string_type(k)
+            if v is None:
+                parts.append(k.replace('_', '-'))
+            else:
+                v = self._convert_string_type(v)
+                parts.append(_formatparam(k.replace('_', '-'), v))
+        self._headers.append((self._convert_string_type(_name), "; ".join(parts)))

server/libreoffice/program/python-core-3.8.8/lib/wsgiref/simple_server.py

@@ -0,0 +1,165 @@
+"""BaseHTTPServer that implements the Python WSGI protocol (PEP 3333)
+
+This is both an example of how WSGI can be implemented, and a basis for running
+simple web applications on a local machine, such as might be done when testing
+or debugging an application.  It has not been reviewed for security issues,
+however, and we strongly recommend that you use a "real" web server for
+production use.
+
+For example usage, see the 'if __name__=="__main__"' block at the end of the
+module.  See also the BaseHTTPServer module docs for other API information.
+"""
+
+from http.server import BaseHTTPRequestHandler, HTTPServer
+import sys
+import urllib.parse
+from wsgiref.handlers import SimpleHandler
+from platform import python_implementation
+
+__version__ = "0.2"
+__all__ = ['WSGIServer', 'WSGIRequestHandler', 'demo_app', 'make_server']
+
+
+server_version = "WSGIServer/" + __version__
+sys_version = python_implementation() + "/" + sys.version.split()[0]
+software_version = server_version + ' ' + sys_version
+
+
+class ServerHandler(SimpleHandler):
+
+    server_software = software_version
+
+    def close(self):
+        try:
+            self.request_handler.log_request(
+                self.status.split(' ',1)[0], self.bytes_sent
+            )
+        finally:
+            SimpleHandler.close(self)
+
+
+
+class WSGIServer(HTTPServer):
+
+    """BaseHTTPServer that implements the Python WSGI protocol"""
+
+    application = None
+
+    def server_bind(self):
+        """Override server_bind to store the server name."""
+        HTTPServer.server_bind(self)
+        self.setup_environ()
+
+    def setup_environ(self):
+        # Set up base environment
+        env = self.base_environ = {}
+        env['SERVER_NAME'] = self.server_name
+        env['GATEWAY_INTERFACE'] = 'CGI/1.1'
+        env['SERVER_PORT'] = str(self.server_port)
+        env['REMOTE_HOST']=''
+        env['CONTENT_LENGTH']=''
+        env['SCRIPT_NAME'] = ''
+
+    def get_app(self):
+        return self.application
+
+    def set_app(self,application):
+        self.application = application
+
+
+
+class WSGIRequestHandler(BaseHTTPRequestHandler):
+
+    server_version = "WSGIServer/" + __version__
+
+    def get_environ(self):
+        env = self.server.base_environ.copy()
+        env['SERVER_PROTOCOL'] = self.request_version
+        env['SERVER_SOFTWARE'] = self.server_version
+        env['REQUEST_METHOD'] = self.command
+        if '?' in self.path:
+            path,query = self.path.split('?',1)
+        else:
+            path,query = self.path,''
+
+        env['PATH_INFO'] = urllib.parse.unquote(path, 'iso-8859-1')
+        env['QUERY_STRING'] = query
+
+        host = self.address_string()
+        if host != self.client_address[0]:
+            env['REMOTE_HOST'] = host
+        env['REMOTE_ADDR'] = self.client_address[0]
+
+        if self.headers.get('content-type') is None:
+            env['CONTENT_TYPE'] = self.headers.get_content_type()
+        else:
+            env['CONTENT_TYPE'] = self.headers['content-type']
+
+        length = self.headers.get('content-length')
+        if length:
+            env['CONTENT_LENGTH'] = length
+
+        for k, v in self.headers.items():
+            k=k.replace('-','_').upper(); v=v.strip()
+            if k in env:
+                continue                    # skip content length, type,etc.
+            if 'HTTP_'+k in env:
+                env['HTTP_'+k] += ','+v     # comma-separate multiple headers
+            else:
+                env['HTTP_'+k] = v
+        return env
+
+    def get_stderr(self):
+        return sys.stderr
+
+    def handle(self):
+        """Handle a single HTTP request"""
+
+        self.raw_requestline = self.rfile.readline(65537)
+        if len(self.raw_requestline) > 65536:
+            self.requestline = ''
+            self.request_version = ''
+            self.command = ''
+            self.send_error(414)
+            return
+
+        if not self.parse_request(): # An error code has been sent, just exit
+            return
+
+        handler = ServerHandler(
+            self.rfile, self.wfile, self.get_stderr(), self.get_environ(),
+            multithread=False,
+        )
+        handler.request_handler = self      # backpointer for logging
+        handler.run(self.server.get_app())
+
+
+
+def demo_app(environ,start_response):
+    from io import StringIO
+    stdout = StringIO()
+    print("Hello world!", file=stdout)
+    print(file=stdout)
+    h = sorted(environ.items())
+    for k,v in h:
+        print(k,'=',repr(v), file=stdout)
+    start_response("200 OK", [('Content-Type','text/plain; charset=utf-8')])
+    return [stdout.getvalue().encode("utf-8")]
+
+
+def make_server(
+    host, port, app, server_class=WSGIServer, handler_class=WSGIRequestHandler
+):
+    """Create a new WSGI server listening on `host` and `port` for `app`"""
+    server = server_class((host, port), handler_class)
+    server.set_app(app)
+    return server
+
+
+if __name__ == '__main__':
+    with make_server('', 8000, demo_app) as httpd:
+        sa = httpd.socket.getsockname()
+        print("Serving HTTP on", sa[0], "port", sa[1], "...")
+        import webbrowser
+        webbrowser.open('http://localhost:8000/xyz?abc')
+        httpd.handle_request()  # serve one request, then exit

server/libreoffice/program/python-core-3.8.8/lib/wsgiref/util.py

@@ -0,0 +1,172 @@
+"""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):
+        import warnings
+        warnings.warn(
+            "FileWrapper's __getitem__ method ignores 'key' parameter. "
+            "Use iterator protocol instead.",
+            DeprecationWarning,
+            stacklevel=2
+        )
+        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.parse import quote
+
+    if environ.get('HTTP_HOST'):
+        url += environ['HTTP_HOST']
+    else:
+        url += environ['SERVER_NAME']
+
+        if environ['wsgi.url_scheme'] == 'https':
+            if environ['SERVER_PORT'] != '443':
+                url += ':' + environ['SERVER_PORT']
+        else:
+            if environ['SERVER_PORT'] != '80':
+                url += ':' + environ['SERVER_PORT']
+
+    url += quote(environ.get('SCRIPT_NAME') or '/', encoding='latin1')
+    return url
+
+def request_uri(environ, include_query=True):
+    """Return the full request URI, optionally including the query string"""
+    url = application_uri(environ)
+    from urllib.parse import quote
+    path_info = quote(environ.get('PATH_INFO',''), safe='/;=,', encoding='latin1')
+    if not environ.get('SCRIPT_NAME'):
+        url += path_info[1:]
+    else:
+        url += path_info
+    if include_query and environ.get('QUERY_STRING'):
+        url += '?' + environ['QUERY_STRING']
+    return url
+
+def shift_path_info(environ):
+    """Shift a name from PATH_INFO to SCRIPT_NAME, returning it
+
+    If there are no remaining path segments in PATH_INFO, return None.
+    Note: 'environ' is modified in-place; use a copy if you need to keep
+    the original PATH_INFO or SCRIPT_NAME.
+
+    Note: when PATH_INFO is just a '/', this returns '' and appends a trailing
+    '/' to SCRIPT_NAME, even though empty path segments are normally ignored,
+    and SCRIPT_NAME doesn't normally end in a '/'.  This is intentional
+    behavior, to ensure that an application can tell the difference between
+    '/x' and '/x/' when traversing to objects.
+    """
+    path_info = environ.get('PATH_INFO','')
+    if not path_info:
+        return None
+
+    path_parts = path_info.split('/')
+    path_parts[1:-1] = [p for p in path_parts[1:-1] if p and p != '.']
+    name = path_parts[1]
+    del path_parts[1]
+
+    script_name = environ.get('SCRIPT_NAME','')
+    script_name = posixpath.normpath(script_name+'/'+name)
+    if script_name.endswith('/'):
+        script_name = script_name[:-1]
+    if not name and not script_name.endswith('/'):
+        script_name += '/'
+
+    environ['SCRIPT_NAME'] = script_name
+    environ['PATH_INFO']   = '/'.join(path_parts)
+
+    # Special case: '/.' on PATH_INFO doesn't get stripped,
+    # because we don't strip the last element of PATH_INFO
+    # if there's only one path part left.  Instead of fixing this
+    # above, we fix it here so that PATH_INFO gets normalized to
+    # an empty string in the environ.
+    if name=='.':
+        name = None
+    return name
+
+def setup_testing_defaults(environ):
+    """Update 'environ' with trivial defaults for testing purposes
+
+    This adds various parameters required for WSGI, including HTTP_HOST,
+    SERVER_NAME, SERVER_PORT, REQUEST_METHOD, SCRIPT_NAME, PATH_INFO,
+    and all of the wsgi.* variables.  It only supplies default values,
+    and does not replace any existing settings for these variables.
+
+    This routine is intended to make it easier for unit tests of WSGI
+    servers and applications to set up dummy environments.  It should *not*
+    be used by actual WSGI servers or applications, since the data is fake!
+    """
+
+    environ.setdefault('SERVER_NAME','127.0.0.1')
+    environ.setdefault('SERVER_PROTOCOL','HTTP/1.0')
+
+    environ.setdefault('HTTP_HOST',environ['SERVER_NAME'])
+    environ.setdefault('REQUEST_METHOD','GET')
+
+    if 'SCRIPT_NAME' not in environ and 'PATH_INFO' not in environ:
+        environ.setdefault('SCRIPT_NAME','')
+        environ.setdefault('PATH_INFO','/')
+
+    environ.setdefault('wsgi.version', (1,0))
+    environ.setdefault('wsgi.run_once', 0)
+    environ.setdefault('wsgi.multithread', 0)
+    environ.setdefault('wsgi.multiprocess', 0)
+
+    from io import StringIO, BytesIO
+    environ.setdefault('wsgi.input', BytesIO())
+    environ.setdefault('wsgi.errors', StringIO())
+    environ.setdefault('wsgi.url_scheme',guess_scheme(environ))
+
+    if environ['wsgi.url_scheme']=='http':
+        environ.setdefault('SERVER_PORT', '80')
+    elif environ['wsgi.url_scheme']=='https':
+        environ.setdefault('SERVER_PORT', '443')
+
+
+
+_hoppish = {
+    'connection', 'keep-alive', 'proxy-authenticate',
+    'proxy-authorization', 'te', 'trailers', 'transfer-encoding',
+    'upgrade'
+}.__contains__
+
+def is_hop_by_hop(header_name):
+    """Return true if 'header_name' is an HTTP/1.1 "Hop-by-Hop" header"""
+    return _hoppish(header_name.lower())

server/libreoffice/program/python-core-3.8.8/lib/wsgiref/validate.py

@@ -0,0 +1,441 @@
+# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
+# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
+# Also licenced under the Apache License, 2.0: http://opensource.org/licenses/apache2.0.php
+# Licensed to PSF under a Contributor Agreement
+"""
+Middleware to check for obedience to the WSGI specification.
+
+Some of the things this checks:
+
+* Signature of the application and start_response (including that
+  keyword arguments are not used).
+
+* Environment checks:
+
+  - Environment is a dictionary (and not a subclass).
+
+  - That all the required keys are in the environment: REQUEST_METHOD,
+    SERVER_NAME, SERVER_PORT, wsgi.version, wsgi.input, wsgi.errors,
+    wsgi.multithread, wsgi.multiprocess, wsgi.run_once
+
+  - That HTTP_CONTENT_TYPE and HTTP_CONTENT_LENGTH are not in the
+    environment (these headers should appear as CONTENT_LENGTH and
+    CONTENT_TYPE).
+
+  - Warns if QUERY_STRING is missing, as the cgi module acts
+    unpredictably in that case.
+
+  - That CGI-style variables (that don't contain a .) have
+    (non-unicode) string values
+
+  - That wsgi.version is a tuple
+
+  - That wsgi.url_scheme is 'http' or 'https' (@@: is this too
+    restrictive?)
+
+  - Warns if the REQUEST_METHOD is not known (@@: probably too
+    restrictive).
+
+  - That SCRIPT_NAME and PATH_INFO are empty or start with /
+
+  - That at least one of SCRIPT_NAME or PATH_INFO are set.
+
+  - That CONTENT_LENGTH is a positive integer.
+
+  - That SCRIPT_NAME is not '/' (it should be '', and PATH_INFO should
+    be '/').
+
+  - That wsgi.input has the methods read, readline, readlines, and
+    __iter__
+
+  - That wsgi.errors has the methods flush, write, writelines
+
+* The status is a string, contains a space, starts with an integer,
+  and that integer is in range (> 100).
+
+* That the headers is a list (not a subclass, not another kind of
+  sequence).
+
+* That the items of the headers are tuples of strings.
+
+* That there is no 'status' header (that is used in CGI, but not in
+  WSGI).
+
+* That the headers don't contain newlines or colons, end in _ or -, or
+  contain characters codes below 037.
+
+* That Content-Type is given if there is content (CGI often has a
+  default content type, but WSGI does not).
+
+* That no Content-Type is given when there is no content (@@: is this
+  too restrictive?)
+
+* That the exc_info argument to start_response is a tuple or None.
+
+* That all calls to the writer are with strings, and no other methods
+  on the writer are accessed.
+
+* That wsgi.input is used properly:
+
+  - .read() is called with exactly one argument
+
+  - That it returns a string
+
+  - That readline, readlines, and __iter__ return strings
+
+  - That .close() is not called
+
+  - No other methods are provided
+
+* That wsgi.errors is used properly:
+
+  - .write() and .writelines() is called with a string
+
+  - That .close() is not called, and no other methods are provided.
+
+* The response iterator:
+
+  - That it is not a string (it should be a list of a single string; a
+    string will work, but perform horribly).
+
+  - That .__next__() returns a string
+
+  - That the iterator is not iterated over until start_response has
+    been called (that can signal either a server or application
+    error).
+
+  - That .close() is called (doesn't raise exception, only prints to
+    sys.stderr, because we only know it isn't called when the object
+    is garbage collected).
+"""
+__all__ = ['validator']
+
+
+import re
+import sys
+import warnings
+
+header_re = re.compile(r'^[a-zA-Z][a-zA-Z0-9\-_]*$')
+bad_header_value_re = re.compile(r'[\000-\037]')
+
+class WSGIWarning(Warning):
+    """
+    Raised in response to WSGI-spec-related warnings
+    """
+
+def assert_(cond, *args):
+    if not cond:
+        raise AssertionError(*args)
+
+def check_string_type(value, title):
+    if type (value) is str:
+        return value
+    raise AssertionError(
+        "{0} must be of type str (got {1})".format(title, repr(value)))
+
+def validator(application):
+
+    """
+    When applied between a WSGI server and a WSGI application, this
+    middleware will check for WSGI compliancy on a number of levels.
+    This middleware does not modify the request or response in any
+    way, but will raise an AssertionError if anything seems off
+    (except for a failure to close the application iterator, which
+    will be printed to stderr -- there's no way to raise an exception
+    at that point).
+    """
+
+    def lint_app(*args, **kw):
+        assert_(len(args) == 2, "Two arguments required")
+        assert_(not kw, "No keyword arguments allowed")
+        environ, start_response = args
+
+        check_environ(environ)
+
+        # We use this to check if the application returns without
+        # calling start_response:
+        start_response_started = []
+
+        def start_response_wrapper(*args, **kw):
+            assert_(len(args) == 2 or len(args) == 3, (
+                "Invalid number of arguments: %s" % (args,)))
+            assert_(not kw, "No keyword arguments allowed")
+            status = args[0]
+            headers = args[1]
+            if len(args) == 3:
+                exc_info = args[2]
+            else:
+                exc_info = None
+
+            check_status(status)
+            check_headers(headers)
+            check_content_type(status, headers)
+            check_exc_info(exc_info)
+
+            start_response_started.append(None)
+            return WriteWrapper(start_response(*args))
+
+        environ['wsgi.input'] = InputWrapper(environ['wsgi.input'])
+        environ['wsgi.errors'] = ErrorWrapper(environ['wsgi.errors'])
+
+        iterator = application(environ, start_response_wrapper)
+        assert_(iterator is not None and iterator != False,
+            "The application must return an iterator, if only an empty list")
+
+        check_iterator(iterator)
+
+        return IteratorWrapper(iterator, start_response_started)
+
+    return lint_app
+
+class InputWrapper:
+
+    def __init__(self, wsgi_input):
+        self.input = wsgi_input
+
+    def read(self, *args):
+        assert_(len(args) == 1)
+        v = self.input.read(*args)
+        assert_(type(v) is bytes)
+        return v
+
+    def readline(self, *args):
+        assert_(len(args) <= 1)
+        v = self.input.readline(*args)
+        assert_(type(v) is bytes)
+        return v
+
+    def readlines(self, *args):
+        assert_(len(args) <= 1)
+        lines = self.input.readlines(*args)
+        assert_(type(lines) is list)
+        for line in lines:
+            assert_(type(line) is bytes)
+        return lines
+
+    def __iter__(self):
+        while 1:
+            line = self.readline()
+            if not line:
+                return
+            yield line
+
+    def close(self):
+        assert_(0, "input.close() must not be called")
+
+class ErrorWrapper:
+
+    def __init__(self, wsgi_errors):
+        self.errors = wsgi_errors
+
+    def write(self, s):
+        assert_(type(s) is str)
+        self.errors.write(s)
+
+    def flush(self):
+        self.errors.flush()
+
+    def writelines(self, seq):
+        for line in seq:
+            self.write(line)
+
+    def close(self):
+        assert_(0, "errors.close() must not be called")
+
+class WriteWrapper:
+
+    def __init__(self, wsgi_writer):
+        self.writer = wsgi_writer
+
+    def __call__(self, s):
+        assert_(type(s) is bytes)
+        self.writer(s)
+
+class PartialIteratorWrapper:
+
+    def __init__(self, wsgi_iterator):
+        self.iterator = wsgi_iterator
+
+    def __iter__(self):
+        # We want to make sure __iter__ is called
+        return IteratorWrapper(self.iterator, None)
+
+class IteratorWrapper:
+
+    def __init__(self, wsgi_iterator, check_start_response):
+        self.original_iterator = wsgi_iterator
+        self.iterator = iter(wsgi_iterator)
+        self.closed = False
+        self.check_start_response = check_start_response
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        assert_(not self.closed,
+            "Iterator read after closed")
+        v = next(self.iterator)
+        if type(v) is not bytes:
+            assert_(False, "Iterator yielded non-bytestring (%r)" % (v,))
+        if self.check_start_response is not None:
+            assert_(self.check_start_response,
+                "The application returns and we started iterating over its body, but start_response has not yet been called")
+            self.check_start_response = None
+        return v
+
+    def close(self):
+        self.closed = True
+        if hasattr(self.original_iterator, 'close'):
+            self.original_iterator.close()
+
+    def __del__(self):
+        if not self.closed:
+            sys.stderr.write(
+                "Iterator garbage collected without being closed")
+        assert_(self.closed,
+            "Iterator garbage collected without being closed")
+
+def check_environ(environ):
+    assert_(type(environ) is dict,
+        "Environment is not of the right type: %r (environment: %r)"
+        % (type(environ), environ))
+
+    for key in ['REQUEST_METHOD', 'SERVER_NAME', 'SERVER_PORT',
+                'wsgi.version', 'wsgi.input', 'wsgi.errors',
+                'wsgi.multithread', 'wsgi.multiprocess',
+                'wsgi.run_once']:
+        assert_(key in environ,
+            "Environment missing required key: %r" % (key,))
+
+    for key in ['HTTP_CONTENT_TYPE', 'HTTP_CONTENT_LENGTH']:
+        assert_(key not in environ,
+            "Environment should not have the key: %s "
+            "(use %s instead)" % (key, key[5:]))
+
+    if 'QUERY_STRING' not in environ:
+        warnings.warn(
+            'QUERY_STRING is not in the WSGI environment; the cgi '
+            'module will use sys.argv when this variable is missing, '
+            'so application errors are more likely',
+            WSGIWarning)
+
+    for key in environ.keys():
+        if '.' in key:
+            # Extension, we don't care about its type
+            continue
+        assert_(type(environ[key]) is str,
+            "Environmental variable %s is not a string: %r (value: %r)"
+            % (key, type(environ[key]), environ[key]))
+
+    assert_(type(environ['wsgi.version']) is tuple,
+        "wsgi.version should be a tuple (%r)" % (environ['wsgi.version'],))
+    assert_(environ['wsgi.url_scheme'] in ('http', 'https'),
+        "wsgi.url_scheme unknown: %r" % environ['wsgi.url_scheme'])
+
+    check_input(environ['wsgi.input'])
+    check_errors(environ['wsgi.errors'])
+
+    # @@: these need filling out:
+    if environ['REQUEST_METHOD'] not in (
+        'GET', 'HEAD', 'POST', 'OPTIONS', 'PATCH', 'PUT', 'DELETE', 'TRACE'):
+        warnings.warn(
+            "Unknown REQUEST_METHOD: %r" % environ['REQUEST_METHOD'],
+            WSGIWarning)
+
+    assert_(not environ.get('SCRIPT_NAME')
+            or environ['SCRIPT_NAME'].startswith('/'),
+        "SCRIPT_NAME doesn't start with /: %r" % environ['SCRIPT_NAME'])
+    assert_(not environ.get('PATH_INFO')
+            or environ['PATH_INFO'].startswith('/'),
+        "PATH_INFO doesn't start with /: %r" % environ['PATH_INFO'])
+    if environ.get('CONTENT_LENGTH'):
+        assert_(int(environ['CONTENT_LENGTH']) >= 0,
+            "Invalid CONTENT_LENGTH: %r" % environ['CONTENT_LENGTH'])
+
+    if not environ.get('SCRIPT_NAME'):
+        assert_('PATH_INFO' in environ,
+            "One of SCRIPT_NAME or PATH_INFO are required (PATH_INFO "
+            "should at least be '/' if SCRIPT_NAME is empty)")
+    assert_(environ.get('SCRIPT_NAME') != '/',
+        "SCRIPT_NAME cannot be '/'; it should instead be '', and "
+        "PATH_INFO should be '/'")
+
+def check_input(wsgi_input):
+    for attr in ['read', 'readline', 'readlines', '__iter__']:
+        assert_(hasattr(wsgi_input, attr),
+            "wsgi.input (%r) doesn't have the attribute %s"
+            % (wsgi_input, attr))
+
+def check_errors(wsgi_errors):
+    for attr in ['flush', 'write', 'writelines']:
+        assert_(hasattr(wsgi_errors, attr),
+            "wsgi.errors (%r) doesn't have the attribute %s"
+            % (wsgi_errors, attr))
+
+def check_status(status):
+    status = check_string_type(status, "Status")
+    # Implicitly check that we can turn it into an integer:
+    status_code = status.split(None, 1)[0]
+    assert_(len(status_code) == 3,
+        "Status codes must be three characters: %r" % status_code)
+    status_int = int(status_code)
+    assert_(status_int >= 100, "Status code is invalid: %r" % status_int)
+    if len(status) < 4 or status[3] != ' ':
+        warnings.warn(
+            "The status string (%r) should be a three-digit integer "
+            "followed by a single space and a status explanation"
+            % status, WSGIWarning)
+
+def check_headers(headers):
+    assert_(type(headers) is list,
+        "Headers (%r) must be of type list: %r"
+        % (headers, type(headers)))
+    for item in headers:
+        assert_(type(item) is tuple,
+            "Individual headers (%r) must be of type tuple: %r"
+            % (item, type(item)))
+        assert_(len(item) == 2)
+        name, value = item
+        name = check_string_type(name, "Header name")
+        value = check_string_type(value, "Header value")
+        assert_(name.lower() != 'status',
+            "The Status header cannot be used; it conflicts with CGI "
+            "script, and HTTP status is not given through headers "
+            "(value: %r)." % value)
+        assert_('\n' not in name and ':' not in name,
+            "Header names may not contain ':' or '\\n': %r" % name)
+        assert_(header_re.search(name), "Bad header name: %r" % name)
+        assert_(not name.endswith('-') and not name.endswith('_'),
+            "Names may not end in '-' or '_': %r" % name)
+        if bad_header_value_re.search(value):
+            assert_(0, "Bad header value: %r (bad char: %r)"
+            % (value, bad_header_value_re.search(value).group(0)))
+
+def check_content_type(status, headers):
+    status = check_string_type(status, "Status")
+    code = int(status.split(None, 1)[0])
+    # @@: need one more person to verify this interpretation of RFC 2616
+    #     http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
+    NO_MESSAGE_BODY = (204, 304)
+    for name, value in headers:
+        name = check_string_type(name, "Header name")
+        if name.lower() == 'content-type':
+            if code not in NO_MESSAGE_BODY:
+                return
+            assert_(0, ("Content-Type header found in a %s response, "
+                        "which must not return content.") % code)
+    if code not in NO_MESSAGE_BODY:
+        assert_(0, "No Content-Type header found in headers (%s)" % headers)
+
+def check_exc_info(exc_info):
+    assert_(exc_info is None or type(exc_info) is tuple,
+        "exc_info (%r) is not a tuple: %r" % (exc_info, type(exc_info)))
+    # More exc_info checks?
+
+def check_iterator(iterator):
+    # Technically a bytestring is legal, which is why it's a really bad
+    # idea, because it may cause the response to be returned
+    # character-by-character
+    assert_(not isinstance(iterator, (str, bytes)),
+        "You should not return a string as your application iterator, "
+        "instead return a single-item list containing a bytestring.")