#! /usr/local/bin/python

# NOTE: the above "/usr/local/bin/python" is NOT a mistake. It is

# intentionally NOT "/usr/bin/env python". On many systems

# (e.g. Solaris), /usr/local/bin is not in $PATH as passed to CGI

# scripts, and /usr/local/bin is the default directory where Python is

# installed, so /usr/bin/env would be unable to find python. Granted,

# binary installations by Linux vendors often install Python in

# /usr/bin. So let those vendors patch cgi.py to match their choice

# of installation.

"""Support module for CGI (Common Gateway Interface) scripts.

This module defines a number of utilities for use by CGI scripts

written in Python.

The global variable maxlen can be set to an integer indicating the maximum size

of a POST request. POST requests larger than this size will result in a

ValueError being raised during parsing. The default value of this variable is 0,

meaning the request size is unlimited.

"""

# History

# -------

#

# Michael McLay started this module. Steve Majewski changed the

# interface to SvFormContentDict and FormContentDict. The multipart

# parsing was inspired by code submitted by Andreas Paepcke. Guido van

# Rossum rewrote, reformatted and documented the module and is currently

# responsible for its maintenance.

#

__version__ = "2.6"

# Imports

# =======

from io import StringIO, BytesIO, TextIOWrapper

from collections.abc import Mapping

import sys

import os

import urllib.parse

from email.parser import FeedParser

from email.message import Message

import html

import locale

import tempfile

import warnings

__all__ = ["MiniFieldStorage", "FieldStorage", "parse", "parse_multipart",

"parse_header", "test", "print_exception", "print_environ",

"print_form", "print_directory", "print_arguments",

"print_environ_usage"]

warnings._deprecated(__name__, remove=(3,13))

# Logging support

# ===============

logfile = "" # Filename to log to, if not empty

logfp = None # File object to log to, if not None

def initlog(*allargs):

"""Write a log message, if there is a log file.

Even though this function is called initlog(), you should always

use log(); log is a variable that is set either to initlog

(initially), to dolog (once the log file has been opened), or to

nolog (when logging is disabled).

The first argument is a format string; the remaining arguments (if

any) are arguments to the % operator, so e.g.

log("%s: %s", "a", "b")

will write "a: b" to the log file, followed by a newline.

If the global logfp is not None, it should be a file object to

which log data is written.

If the global logfp is None, the global logfile may be a string

giving a filename to open, in append mode. This file should be

world writable!!! If the file can't be opened, logging is

silently disabled (since there is no safe place where we could

send an error message).

"""

global log, logfile, logfp

warnings.warn("cgi.log() is deprecated as of 3.10. Use logging instead",

DeprecationWarning, stacklevel=2)

if logfile and not logfp:

try:

logfp = open(logfile, "a", encoding="locale")

except OSError:

pass

if not logfp:

log = nolog

else:

log = dolog

log(*allargs)

def dolog(fmt, *args):

"""Write a log message to the log file. See initlog() for docs."""

logfp.write(fmt%args + "\n")

def nolog(*allargs):

"""Dummy function, assigned to log when logging is disabled."""

pass

def closelog():

"""Close the log file."""

global log, logfile, logfp

logfile = ''

if logfp:

logfp.close()

logfp = None

log = initlog

log = initlog # The current logging function

# Parsing functions

# =================

# Maximum input we will accept when REQUEST_METHOD is POST

# 0 ==> unlimited input

maxlen = 0

def parse(fp=None, environ=os.environ, keep_blank_values=0,

strict_parsing=0, separator='&'):

"""Parse a query in the environment or from a file (default stdin)

Arguments, all optional:

fp : file pointer; default: sys.stdin.buffer

environ : environment dictionary; default: os.environ

keep_blank_values: flag indicating whether blank values in

percent-encoded forms should be treated as blank strings.

A true value indicates that blanks should be retained as

blank strings. The default false value indicates that

blank values are to be ignored and treated as if they were

not included.

strict_parsing: flag indicating what to do with parsing errors.

If false (the default), errors are silently ignored.

If true, errors raise a ValueError exception.

separator: str. The symbol to use for separating the query arguments.

Defaults to &.

"""

if fp is None:

fp = sys.stdin

# field keys and values (except for files) are returned as strings

# an encoding is required to decode the bytes read from self.fp

if hasattr(fp,'encoding'):

encoding = fp.encoding

else:

encoding = 'latin-1'

# fp.read() must return bytes

if isinstance(fp, TextIOWrapper):

fp = fp.buffer

if not 'REQUEST_METHOD' in environ:

environ['REQUEST_METHOD'] = 'GET' # For testing stand-alone

if environ['REQUEST_METHOD'] == 'POST':

ctype, pdict = parse_header(environ['CONTENT_TYPE'])

if ctype == 'multipart/form-data':

return parse_multipart(fp, pdict, separator=separator)

elif ctype == 'application/x-www-form-urlencoded':

clength = int(environ['CONTENT_LENGTH'])

if maxlen and clength > maxlen:

raise ValueError('Maximum content length exceeded')

qs = fp.read(clength).decode(encoding)

else:

qs = '' # Unknown content-type

if 'QUERY_STRING' in environ:

if qs: qs = qs + '&'

qs = qs + environ['QUERY_STRING']

elif sys.argv[1:]:

if qs: qs = qs + '&'

qs = qs + sys.argv[1]

environ['QUERY_STRING'] = qs # XXX Shouldn't, really

elif 'QUERY_STRING' in environ:

qs = environ['QUERY_STRING']

else:

if sys.argv[1:]:

qs = sys.argv[1]

else:

qs = ""

environ['QUERY_STRING'] = qs # XXX Shouldn't, really

return urllib.parse.parse_qs(qs, keep_blank_values, strict_parsing,

encoding=encoding, separator=separator)

def parse_multipart(fp, pdict, encoding="utf-8", errors="replace", separator='&'):

"""Parse multipart input.

Arguments:

fp : input file

pdict: dictionary containing other parameters of content-type header

encoding, errors: request encoding and error handler, passed to

FieldStorage

Returns a dictionary just like parse_qs(): keys are the field names, each

value is a list of values for that field. For non-file fields, the value

is a list of strings.

"""

# RFC 2046, Section 5.1 : The "multipart" boundary delimiters are always

# represented as 7bit US-ASCII.

boundary = pdict['boundary'].decode('ascii')

ctype = "multipart/form-data; boundary={}".format(boundary)

headers = Message()

headers.set_type(ctype)

try:

headers['Content-Length'] = pdict['CONTENT-LENGTH']

except KeyError:

pass

fs = FieldStorage(fp, headers=headers, encoding=encoding, errors=errors,

environ={'REQUEST_METHOD': 'POST'}, separator=separator)

return {k: fs.getlist(k) for k in fs}

def _parseparam(s):

while s[:1] == ';':

s = s[1:]

end = s.find(';')

while end > 0 and (s.count('"', 0, end) - s.count('\\"', 0, end)) % 2:

end = s.find(';', end + 1)

if end < 0:

end = len(s)

f = s[:end]

yield f.strip()

s = s[end:]

def parse_header(line):

"""Parse a Content-type like header.

Return the main content-type and a dictionary of options.

"""

parts = _parseparam(';' + line)

key = parts.__next__()

pdict = {}

for p in parts:

i = p.find('=')

if i >= 0:

name = p[:i].strip().lower()

value = p[i+1:].strip()

if len(value) >= 2 and value[0] == value[-1] == '"':

value = value[1:-1]

value = value.replace('\\\\', '\\').replace('\\"', '"')

pdict[name] = value

return key, pdict

# Classes for field storage

# =========================

class MiniFieldStorage:

"""Like FieldStorage, for use when no file uploads are possible."""

# Dummy attributes

filename = None

list = None

type = None

file = None

type_options = {}

disposition = None

disposition_options = {}

headers = {}

def __init__(self, name, value):

"""Constructor from field name and value."""

self.name = name

self.value = value

# self.file = StringIO(value)

def __repr__(self):

"""Return printable representation."""

return "MiniFieldStorage(%r, %r)" % (self.name, self.value)

class FieldStorage:

"""Store a sequence of fields, reading multipart/form-data.

This class provides naming, typing, files stored on disk, and

more. At the top level, it is accessible like a dictionary, whose

keys are the field names. (Note: None can occur as a field name.)

The items are either a Python list (if there's multiple values) or

another FieldStorage or MiniFieldStorage object. If it's a single

object, it has the following attributes:

name: the field name, if specified; otherwise None

filename: the filename, if specified; otherwise None; this is the

client side filename, *not* the file name on which it is

stored (that's a temporary file you don't deal with)

value: the value as a *string*; for file uploads, this

transparently reads the file every time you request the value

and returns *bytes*

file: the file(-like) object from which you can read the data *as

bytes* ; None if the data is stored a simple string

type: the content-type, or None if not specified

type_options: dictionary of options specified on the content-type

line

disposition: content-disposition, or None if not specified

disposition_options: dictionary of corresponding options

headers: a dictionary(-like) object (sometimes email.message.Message or a

subclass thereof) containing *all* headers

The class is subclassable, mostly for the purpose of overriding

the make_file() method, which is called internally to come up with

a file open for reading and writing. This makes it possible to

override the default choice of storing all files in a temporary

directory and unlinking them as soon as they have been opened.

"""

def __init__(self, fp=None, headers=None, outerboundary=b'',

environ=os.environ, keep_blank_values=0, strict_parsing=0,

limit=None, encoding='utf-8', errors='replace',

max_num_fields=None, separator='&'):

"""Constructor. Read multipart/* until last part.

Arguments, all optional:

fp : file pointer; default: sys.stdin.buffer

(not used when the request method is GET)

Can be :

1. a TextIOWrapper object

2. an object whose read() and readline() methods return bytes

headers : header dictionary-like object; default:

taken from environ as per CGI spec

outerboundary : terminating multipart boundary

(for internal use only)

environ : environment dictionary; default: os.environ

keep_blank_values: flag indicating whether blank values in

percent-encoded forms should be treated as blank strings.

A true value indicates that blanks should be retained as

blank strings. The default false value indicates that

blank values are to be ignored and treated as if they were

not included.

strict_parsing: flag indicating what to do with parsing errors.

If false (the default), errors are silently ignored.

If true, errors raise a ValueError exception.

limit : used internally to read parts of multipart/form-data forms,

to exit from the reading loop when reached. It is the difference

between the form content-length and the number of bytes already

read

encoding, errors : the encoding and error handler used to decode the

binary stream to strings. Must be the same as the charset defined

for the page sending the form (content-type : meta http-equiv or

header)

max_num_fields: int. If set, then __init__ throws a ValueError

if there are more than n fields read by parse_qsl().

"""

method = 'GET'

self.keep_blank_values = keep_blank_values

self.strict_parsing = strict_parsing

self.max_num_fields = max_num_fields

self.separator = separator

if 'REQUEST_METHOD' in environ:

method = environ['REQUEST_METHOD'].upper()

self.qs_on_post = None

if method == 'GET' or method == 'HEAD':

if 'QUERY_STRING' in environ:

qs = environ['QUERY_STRING']

elif sys.argv[1:]:

qs = sys.argv[1]

else:

qs = ""

qs = qs.encode(locale.getpreferredencoding(), 'surrogateescape')

fp = BytesIO(qs)

if headers is None:

headers = {'content-type':

"application/x-www-form-urlencoded"}

if headers is None:

headers = {}

if method == 'POST':

# Set default content-type for POST to what's traditional

headers['content-type'] = "application/x-www-form-urlencoded"

if 'CONTENT_TYPE' in environ:

headers['content-type'] = environ['CONTENT_TYPE']

if 'QUERY_STRING' in environ:

self.qs_on_post = environ['QUERY_STRING']

if 'CONTENT_LENGTH' in environ:

headers['content-length'] = environ['CONTENT_LENGTH']

else:

if not (isinstance(headers, (Mapping, Message))):

raise TypeError("headers must be mapping or an instance of "

"email.message.Message")

self.headers = headers

if fp is None:

self.fp = sys.stdin.buffer

# self.fp.read() must return bytes

elif isinstance(fp, TextIOWrapper):

self.fp = fp.buffer

else:

if not (hasattr(fp, 'read') and hasattr(fp, 'readline')):

raise TypeError("fp must be file pointer")

self.fp = fp

self.encoding = encoding

self.errors = errors

if not isinstance(outerboundary, bytes):

raise TypeError('outerboundary must be bytes, not %s'

% type(outerboundary).__name__)

self.outerboundary = outerboundary

self.bytes_read = 0

self.limit = limit

# Process content-disposition header

cdisp, pdict = "", {}

if 'content-disposition' in self.headers:

cdisp, pdict = parse_header(self.headers['content-disposition'])

self.disposition = cdisp

self.disposition_options = pdict

self.name = None

if 'name' in pdict:

self.name = pdict['name']

self.filename = None

if 'filename' in pdict:

self.filename = pdict['filename']

self._binary_file = self.filename is not None

# Process content-type header

#

# Honor any existing content-type header. But if there is no

# content-type header, use some sensible defaults. Assume

# outerboundary is "" at the outer level, but something non-false

# inside a multi-part. The default for an inner part is text/plain,

# but for an outer part it should be urlencoded. This should catch

# bogus clients which erroneously forget to include a content-type

# header.

#

# See below for what we do if there does exist a content-type header,

# but it happens to be something we don't understand.

if 'content-type' in self.headers:

ctype, pdict = parse_header(self.headers['content-type'])

elif self.outerboundary or method != 'POST':

ctype, pdict = "text/plain", {}

else:

ctype, pdict = 'application/x-www-form-urlencoded', {}

self.type = ctype

self.type_options = pdict

if 'boundary' in pdict:

self.innerboundary = pdict['boundary'].encode(self.encoding,

self.errors)

else:

self.innerboundary = b""

clen = -1

if 'content-length' in self.headers:

try:

clen = int(self.headers['content-length'])

except ValueError:

pass

if maxlen and clen > maxlen:

raise ValueError('Maximum content length exceeded')

self.length = clen

if self.limit is None and clen >= 0:

self.limit = clen

self.list = self.file = None

self.done = 0

if ctype == 'application/x-www-form-urlencoded':

self.read_urlencoded()

elif ctype[:10] == 'multipart/':

self.read_multi(environ, keep_blank_values, strict_parsing)

else:

self.read_single()

def __del__(self):

try:

self.file.close()

except AttributeError:

pass

def __enter__(self):

return self

def __exit__(self, *args):

self.file.close()

def __repr__(self):

"""Return a printable representation."""

return "FieldStorage(%r, %r, %r)" % (

self.name, self.filename, self.value)

def __iter__(self):

return iter(self.keys())

def __getattr__(self, name):

if name != 'value':

raise AttributeError(name)

if self.file:

self.file.seek(0)

value = self.file.read()

self.file.seek(0)

elif self.list is not None:

value = self.list

else:

value = None

return value

def __getitem__(self, key):

"""Dictionary style indexing."""

if self.list is None:

raise TypeError("not indexable")

found = []

for item in self.list:

if item.name == key: found.append(item)

if not found:

raise KeyError(key)

if len(found) == 1:

return found[0]

else:

return found

def getvalue(self, key, default=None):

"""Dictionary style get() method, including 'value' lookup."""

if key in self:

value = self[key]

if isinstance(value, list):

return [x.value for x in value]

else:

return value.value

else:

return default

def getfirst(self, key, default=None):

""" Return the first value received."""

if key in self:

value = self[key]

if isinstance(value, list):

return value[0].value

else:

return value.value

else:

return default

def getlist(self, key):

""" Return list of received values."""

if key in self:

value = self[key]

if isinstance(value, list):

return [x.value for x in value]

else:

return [value.value]

else:

return []

def keys(self):

"""Dictionary style keys() method."""

if self.list is None:

raise TypeError("not indexable")

return list(set(item.name for item in self.list))

def __contains__(self, key):

"""Dictionary style __contains__ method."""

if self.list is None:

raise TypeError("not indexable")

return any(item.name == key for item in self.list)

def __len__(self):

"""Dictionary style len(x) support."""

return len(self.keys())

def __bool__(self):

if self.list is None:

raise TypeError("Cannot be converted to bool.")

return bool(self.list)

def read_urlencoded(self):

"""Internal: read data in query string format."""

qs = self.fp.read(self.length)

if not isinstance(qs, bytes):

raise ValueError("%s should return bytes, got %s" \

% (self.fp, type(qs).__name__))

qs = qs.decode(self.encoding, self.errors)

if self.qs_on_post:

qs += '&' + self.qs_on_post

query = urllib.parse.parse_qsl(

qs, self.keep_blank_values, self.strict_parsing,

encoding=self.encoding, errors=self.errors,

max_num_fields=self.max_num_fields, separator=self.separator)

self.list = [MiniFieldStorage(key, value) for key, value in query]

self.skip_lines()

FieldStorageClass = None

def read_multi(self, environ, keep_blank_values, strict_parsing):

"""Internal: read a part that is itself multipart."""

ib = self.innerboundary

if not valid_boundary(ib):

raise ValueError('Invalid boundary in multipart form: %r' % (ib,))

self.list = []

if self.qs_on_post:

query = urllib.parse.parse_qsl(

self.qs_on_post, self.keep_blank_values, self.strict_parsing,

encoding=self.encoding, errors=self.errors,

max_num_fields=self.max_num_fields, separator=self.separator)

self.list.extend(MiniFieldStorage(key, value) for key, value in query)

klass = self.FieldStorageClass or self.__class__

first_line = self.fp.readline() # bytes

if not isinstance(first_line, bytes):

raise ValueError("%s should return bytes, got %s" \

% (self.fp, type(first_line).__name__))

self.bytes_read += len(first_line)

# Ensure that we consume the file until we've hit our inner boundary

while (first_line.strip() != (b"--" + self.innerboundary) and

first_line):

first_line = self.fp.readline()

self.bytes_read += len(first_line)

# Propagate max_num_fields into the sub class appropriately

max_num_fields = self.max_num_fields

if max_num_fields is not None:

max_num_fields -= len(self.list)

while True:

parser = FeedParser()

hdr_text = b""

while True:

data = self.fp.readline()

hdr_text += data

if not data.strip():

break

if not hdr_text:

break

# parser takes strings, not bytes

self.bytes_read += len(hdr_text)

parser.feed(hdr_text.decode(self.encoding, self.errors))

headers = parser.close()

# Some clients add Content-Length for part headers, ignore them

if 'content-length' in headers:

del headers['content-length']

limit = None if self.limit is None \

else self.limit - self.bytes_read

part = klass(self.fp, headers, ib, environ, keep_blank_values,

strict_parsing, limit,

self.encoding, self.errors, max_num_fields, self.separator)

if max_num_fields is not None:

max_num_fields -= 1

if part.list:

max_num_fields -= len(part.list)

if max_num_fields < 0:

raise ValueError('Max number of fields exceeded')

self.bytes_read += part.bytes_read

self.list.append(part)

if part.done or self.bytes_read >= self.length > 0:

break

self.skip_lines()

def read_single(self):

"""Internal: read an atomic part."""

if self.length >= 0:

self.read_binary()

self.skip_lines()

else:

self.read_lines()

self.file.seek(0)

bufsize = 8*1024 # I/O buffering size for copy to file

def read_binary(self):

"""Internal: read binary data."""

self.file = self.make_file()

todo = self.length

if todo >= 0:

while todo > 0:

data = self.fp.read(min(todo, self.bufsize)) # bytes

if not isinstance(data, bytes):

raise ValueError("%s should return bytes, got %s"

% (self.fp, type(data).__name__))

self.bytes_read += len(data)

if not data:

self.done = -1

break

self.file.write(data)

todo = todo - len(data)

def read_lines(self):

"""Internal: read lines until EOF or outerboundary."""

if self._binary_file:

self.file = self.__file = BytesIO() # store data as bytes for files

else:

self.file = self.__file = StringIO() # as strings for other fields

if self.outerboundary:

self.read_lines_to_outerboundary()

else:

self.read_lines_to_eof()

def __write(self, line):

"""line is always bytes, not string"""

if self.__file is not None:

if self.__file.tell() + len(line) > 1000:

self.file = self.make_file()

data = self.__file.getvalue()

self.file.write(data)

self.__file = None

if self._binary_file:

# keep bytes

self.file.write(line)

else:

# decode to string

self.file.write(line.decode(self.encoding, self.errors))

def read_lines_to_eof(self):

"""Internal: read lines until EOF."""

while 1:

line = self.fp.readline(1<<16) # bytes

self.bytes_read += len(line)

if not line:

self.done = -1

break

self.__write(line)

def read_lines_to_outerboundary(self):

"""Internal: read lines until outerboundary.

Data is read as bytes: boundaries and line ends must be converted

to bytes for comparisons.

"""

next_boundary = b"--" + self.outerboundary

last_boundary = next_boundary + b"--"

delim = b""

last_line_lfend = True

_read = 0

while 1:

if self.limit is not None and 0 <= self.limit <= _read:

break

line = self.fp.readline(1<<16) # bytes

self.bytes_read += len(line)

_read += len(line)

if not line:

self.done = -1

break

if delim == b"\r":

line = delim + line

delim = b""

if line.startswith(b"--") and last_line_lfend:

strippedline = line.rstrip()

if strippedline == next_boundary:

break

if strippedline == last_boundary:

self.done = 1

break

odelim = delim

if line.endswith(b"\r\n"):

delim = b"\r\n"

line = line[:-2]

last_line_lfend = True

elif line.endswith(b"\n"):

delim = b"\n"

line = line[:-1]

last_line_lfend = True

elif line.endswith(b"\r"):

# We may interrupt \r\n sequences if they span the 2**16

# byte boundary

delim = b"\r"

line = line[:-1]

last_line_lfend = False

else:

delim = b""

last_line_lfend = False

self.__write(odelim + line)

def skip_lines(self):

"""Internal: skip lines until outer boundary if defined."""

if not self.outerboundary or self.done:

return

next_boundary = b"--" + self.outerboundary

last_boundary = next_boundary + b"--"

last_line_lfend = True

while True:

line = self.fp.readline(1<<16)

self.bytes_read += len(line)

if not line:

self.done = -1

break

if line.endswith(b"--") and last_line_lfend:

strippedline = line.strip()

if strippedline == next_boundary:

break

if strippedline == last_boundary:

self.done = 1

break

last_line_lfend = line.endswith(b'\n')

def make_file(self):

"""Overridable: return a readable & writable file.

The file will be used as follows:

- data is written to it

- seek(0)

- data is read from it

The file is opened in binary mode for files, in text mode

for other fields

This version opens a temporary file for reading and writing,

and immediately deletes (unlinks) it. The trick (on Unix!) is

that the file can still be used, but it can't be opened by

another process, and it will automatically be deleted when it

is closed or when the current process terminates.

If you want a more permanent file, you derive a class which

overrides this method. If you want a visible temporary file

that is nevertheless automatically deleted when the script

terminates, try defining a __del__ method in a derived class

which unlinks the temporary files you have created.

"""

if self._binary_file:

return tempfile.TemporaryFile("wb+")

else:

return tempfile.TemporaryFile("w+",

encoding=self.encoding, newline = '\n')

# Test/debug code

# ===============

def test(environ=os.environ):

"""Robust test CGI script, usable as main program.

Write minimal HTTP headers and dump all information provided to

the script in HTML form.

"""

print("Content-type: text/html")

print()

sys.stderr = sys.stdout

try:

form = FieldStorage() # Replace with other classes to test those

print_directory()

print_arguments()

print_form(form)

print_environ(environ)

print_environ_usage()

def f():

exec("testing print_exception() -- <I>italics?</I>")

def g(f=f):

f()

print("<H3>What follows is a test, not an actual exception:</H3>")

g()

except:

print_exception()

print("<H1>Second try with a small maxlen...</H1>")

global maxlen

maxlen = 50

try:

form = FieldStorage() # Replace with other classes to test those

print_directory()

print_arguments()

print_form(form)

print_environ(environ)

except:

print_exception()

def print_exception(type=None, value=None, tb=None, limit=None):

if type is None:

type, value, tb = sys.exc_info()

import traceback

print()

print("<H3>Traceback (most recent call last):</H3>")

list = traceback.format_tb(tb, limit) + \

traceback.format_exception_only(type, value)

print("<PRE>%s<B>%s</B></PRE>" % (

html.escape("".join(list[:-1])),

html.escape(list[-1]),

))

del tb

def print_environ(environ=os.environ):

"""Dump the shell environment as HTML."""

keys = sorted(environ.keys())

print()

print("<H3>Shell Environment:</H3>")

print("<DL>")

for key in keys:

print("<DT>", html.escape(key), "<DD>", html.escape(environ[key]))

print("</DL>")

print()

def print_form(form):

"""Dump the contents of a form as HTML."""

keys = sorted(form.keys())

print()

print("<H3>Form Contents:</H3>")

if not keys:

print("<P>No form fields.")

print("<DL>")

for key in keys:

print("<DT>" + html.escape(key) + ":", end=' ')

value = form[key]

print("<i>" + html.escape(repr(type(value))) + "</i>")

print("<DD>" + html.escape(repr(value)))

print("</DL>")

print()

def print_directory():

"""Dump the current directory as HTML."""

print()

print("<H3>Current Working Directory:</H3>")

try:

pwd = os.getcwd()

except OSError as msg:

print("OSError:", html.escape(str(msg)))

else:

print(html.escape(pwd))

print()

def print_arguments():

print()

print("<H3>Command Line Arguments:</H3>")

print()

print(sys.argv)

print()

def print_environ_usage():

"""Dump a list of environment variables used by CGI as HTML."""

print("""

<H3>These environment variables could have been set:</H3>

<UL>

<LI>AUTH_TYPE

<LI>CONTENT_LENGTH

<LI>CONTENT_TYPE

<LI>DATE_GMT

<LI>DATE_LOCAL

<LI>DOCUMENT_NAME

<LI>DOCUMENT_ROOT

<LI>DOCUMENT_URI

<LI>GATEWAY_INTERFACE

<LI>LAST_MODIFIED

<LI>PATH

<LI>PATH_INFO

<LI>PATH_TRANSLATED

<LI>QUERY_STRING

<LI>REMOTE_ADDR

<LI>REMOTE_HOST

<LI>REMOTE_IDENT

<LI>REMOTE_USER

<LI>REQUEST_METHOD

<LI>SCRIPT_NAME

<LI>SERVER_NAME

<LI>SERVER_PORT

<LI>SERVER_PROTOCOL

<LI>SERVER_ROOT

<LI>SERVER_SOFTWARE

</UL>

In addition, HTTP headers sent by the server may be passed in the

environment as well. Here are some common variable names:

<UL>

<LI>HTTP_ACCEPT

<LI>HTTP_CONNECTION

<LI>HTTP_HOST

<LI>HTTP_PRAGMA

<LI>HTTP_REFERER

<LI>HTTP_USER_AGENT

</UL>

""")

# Utilities

# =========

def valid_boundary(s):

import re