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1077

#! /usr/bin/python3.6 

 

# 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. 

""" 

 

# 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 import Mapping 

import sys 

import os 

import urllib.parse 

from email.parser import FeedParser 

from email.message import Message 

from warnings import warn 

import html 

import locale 

import tempfile 

 

__all__ = ["MiniFieldStorage", "FieldStorage", 

"parse", "parse_qs", "parse_qsl", "parse_multipart", 

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

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

"print_environ_usage", "escape"] 

 

# 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 

if logfile and not logfp: 

try: 

logfp = open(logfile, "a") 

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): 

"""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. 

""" 

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) 

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) 

 

 

# parse query string function called from urlparse, 

# this is done in order to maintain backward compatibility. 

 

def parse_qs(qs, keep_blank_values=0, strict_parsing=0): 

"""Parse a query given as a string argument.""" 

warn("cgi.parse_qs is deprecated, use urllib.parse.parse_qs instead", 

DeprecationWarning, 2) 

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

 

def parse_qsl(qs, keep_blank_values=0, strict_parsing=0): 

"""Parse a query given as a string argument.""" 

warn("cgi.parse_qsl is deprecated, use urllib.parse.parse_qsl instead", 

DeprecationWarning, 2) 

return urllib.parse.parse_qsl(qs, keep_blank_values, strict_parsing) 

 

def parse_multipart(fp, pdict): 

"""Parse multipart input. 

 

Arguments: 

fp : input file 

pdict: dictionary containing other parameters of content-type header 

 

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

value is a list of values for that field. This is easy to use but not 

much good if you are expecting megabytes to be uploaded -- in that case, 

use the FieldStorage class instead which is much more flexible. Note 

that content-type is the raw, unparsed contents of the content-type 

header. 

 

XXX This does not parse nested multipart parts -- use FieldStorage for 

that. 

 

XXX This should really be subsumed by FieldStorage altogether -- no 

point in having two implementations of the same parsing algorithm. 

Also, FieldStorage protects itself better against certain DoS attacks 

by limiting the size of the data read in one chunk. The API here 

does not support that kind of protection. This also affects parse() 

since it can call parse_multipart(). 

 

""" 

import http.client 

 

boundary = b"" 

if 'boundary' in pdict: 

boundary = pdict['boundary'] 

if not valid_boundary(boundary): 

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

% (boundary,)) 

 

nextpart = b"--" + boundary 

lastpart = b"--" + boundary + b"--" 

partdict = {} 

terminator = b"" 

 

while terminator != lastpart: 

bytes = -1 

data = None 

if terminator: 

# At start of next part. Read headers first. 

headers = http.client.parse_headers(fp) 

clength = headers.get('content-length') 

if clength: 

try: 

bytes = int(clength) 

except ValueError: 

pass 

if bytes > 0: 

if maxlen and bytes > maxlen: 

raise ValueError('Maximum content length exceeded') 

data = fp.read(bytes) 

else: 

data = b"" 

# Read lines until end of part. 

lines = [] 

while 1: 

line = fp.readline() 

if not line: 

terminator = lastpart # End outer loop 

break 

if line.startswith(b"--"): 

terminator = line.rstrip() 

if terminator in (nextpart, lastpart): 

break 

lines.append(line) 

# Done with part. 

if data is None: 

continue 

if bytes < 0: 

if lines: 

# Strip final line terminator 

line = lines[-1] 

if line[-2:] == b"\r\n": 

line = line[:-2] 

elif line[-1:] == b"\n": 

line = line[:-1] 

lines[-1] = line 

data = b"".join(lines) 

line = headers['content-disposition'] 

if not line: 

continue 

key, params = parse_header(line) 

if key != 'form-data': 

continue 

if 'name' in params: 

name = params['name'] 

else: 

continue 

if name in partdict: 

partdict[name].append(data) 

else: 

partdict[name] = [data] 

 

return partdict 

 

 

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'): 

"""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) 

 

""" 

method = 'GET' 

self.keep_blank_values = keep_blank_values 

self.strict_parsing = strict_parsing 

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) 

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: 

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 

self.list = [] 

query = urllib.parse.parse_qsl( 

qs, self.keep_blank_values, self.strict_parsing, 

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

for key, value in query: 

self.list.append(MiniFieldStorage(key, value)) 

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) 

for key, value in query: 

self.list.append(MiniFieldStorage(key, value)) 

 

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) 

 

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'] 

 

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

strict_parsing,self.limit-self.bytes_read, 

self.encoding, self.errors) 

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 _read >= self.limit: 

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 escape(s, quote=None): 

"""Deprecated API.""" 

warn("cgi.escape is deprecated, use html.escape instead", 

DeprecationWarning, stacklevel=2) 

s = s.replace("&", "&amp;") # Must be done first! 

s = s.replace("<", "&lt;") 

s = s.replace(">", "&gt;") 

if quote: 

s = s.replace('"', "&quot;") 

return s 

 

 

def valid_boundary(s): 

import re 

if isinstance(s, bytes): 

_vb_pattern = b"^[ -~]{0,200}[!-~]$" 

else: 

_vb_pattern = "^[ -~]{0,200}[!-~]$" 

return re.match(_vb_pattern, s) 

 

# Invoke mainline 

# =============== 

 

# Call test() when this file is run as a script (not imported as a module) 

if __name__ == '__main__': 

test()