1019 lines
34 KiB
Python
Executable file
1019 lines
34 KiB
Python
Executable file
#! /usr/local/bin/python
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# NOTE: the above "/usr/local/bin/python" is NOT a mistake. It is
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# intentionally NOT "/usr/bin/env python". On many systems
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# (e.g. Solaris), /usr/local/bin is not in $PATH as passed to CGI
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# scripts, and /usr/local/bin is the default directory where Python is
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# installed, so /usr/bin/env would be unable to find python. Granted,
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# binary installations by Linux vendors often install Python in
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# /usr/bin. So let those vendors patch cgi.py to match their choice
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# of installation.
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"""Support module for CGI (Common Gateway Interface) scripts.
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This module defines a number of utilities for use by CGI scripts
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written in Python.
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"""
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# History
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# -------
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#
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# Michael McLay started this module. Steve Majewski changed the
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# interface to SvFormContentDict and FormContentDict. The multipart
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# parsing was inspired by code submitted by Andreas Paepcke. Guido van
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# Rossum rewrote, reformatted and documented the module and is currently
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# responsible for its maintenance.
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#
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__version__ = "2.6"
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# Imports
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# =======
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from io import StringIO, BytesIO, TextIOWrapper
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from collections.abc import Mapping
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import sys
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import os
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import urllib.parse
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from email.parser import FeedParser
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from email.message import Message
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from warnings import warn
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import html
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import locale
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import tempfile
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__all__ = ["MiniFieldStorage", "FieldStorage",
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"parse", "parse_qs", "parse_qsl", "parse_multipart",
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"parse_header", "test", "print_exception", "print_environ",
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"print_form", "print_directory", "print_arguments",
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"print_environ_usage", "escape"]
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# Logging support
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# ===============
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logfile = "" # Filename to log to, if not empty
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logfp = None # File object to log to, if not None
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def initlog(*allargs):
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"""Write a log message, if there is a log file.
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Even though this function is called initlog(), you should always
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use log(); log is a variable that is set either to initlog
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(initially), to dolog (once the log file has been opened), or to
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nolog (when logging is disabled).
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The first argument is a format string; the remaining arguments (if
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any) are arguments to the % operator, so e.g.
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log("%s: %s", "a", "b")
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will write "a: b" to the log file, followed by a newline.
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If the global logfp is not None, it should be a file object to
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which log data is written.
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If the global logfp is None, the global logfile may be a string
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giving a filename to open, in append mode. This file should be
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world writable!!! If the file can't be opened, logging is
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silently disabled (since there is no safe place where we could
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send an error message).
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"""
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global log, logfile, logfp
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if logfile and not logfp:
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try:
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logfp = open(logfile, "a")
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except OSError:
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pass
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if not logfp:
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log = nolog
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else:
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log = dolog
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log(*allargs)
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def dolog(fmt, *args):
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"""Write a log message to the log file. See initlog() for docs."""
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logfp.write(fmt%args + "\n")
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def nolog(*allargs):
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"""Dummy function, assigned to log when logging is disabled."""
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pass
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def closelog():
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"""Close the log file."""
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global log, logfile, logfp
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logfile = ''
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if logfp:
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logfp.close()
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logfp = None
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log = initlog
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log = initlog # The current logging function
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# Parsing functions
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# =================
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# Maximum input we will accept when REQUEST_METHOD is POST
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# 0 ==> unlimited input
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maxlen = 0
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def parse(fp=None, environ=os.environ, keep_blank_values=0, strict_parsing=0):
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"""Parse a query in the environment or from a file (default stdin)
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Arguments, all optional:
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fp : file pointer; default: sys.stdin.buffer
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environ : environment dictionary; default: os.environ
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keep_blank_values: flag indicating whether blank values in
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percent-encoded forms should be treated as blank strings.
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A true value indicates that blanks should be retained as
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blank strings. The default false value indicates that
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blank values are to be ignored and treated as if they were
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not included.
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strict_parsing: flag indicating what to do with parsing errors.
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If false (the default), errors are silently ignored.
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If true, errors raise a ValueError exception.
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"""
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if fp is None:
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fp = sys.stdin
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# field keys and values (except for files) are returned as strings
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# an encoding is required to decode the bytes read from self.fp
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if hasattr(fp,'encoding'):
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encoding = fp.encoding
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else:
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encoding = 'latin-1'
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# fp.read() must return bytes
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if isinstance(fp, TextIOWrapper):
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fp = fp.buffer
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if not 'REQUEST_METHOD' in environ:
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environ['REQUEST_METHOD'] = 'GET' # For testing stand-alone
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if environ['REQUEST_METHOD'] == 'POST':
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ctype, pdict = parse_header(environ['CONTENT_TYPE'])
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if ctype == 'multipart/form-data':
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return parse_multipart(fp, pdict)
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elif ctype == 'application/x-www-form-urlencoded':
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clength = int(environ['CONTENT_LENGTH'])
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if maxlen and clength > maxlen:
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raise ValueError('Maximum content length exceeded')
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qs = fp.read(clength).decode(encoding)
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else:
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qs = '' # Unknown content-type
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if 'QUERY_STRING' in environ:
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if qs: qs = qs + '&'
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qs = qs + environ['QUERY_STRING']
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elif sys.argv[1:]:
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if qs: qs = qs + '&'
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qs = qs + sys.argv[1]
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environ['QUERY_STRING'] = qs # XXX Shouldn't, really
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elif 'QUERY_STRING' in environ:
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qs = environ['QUERY_STRING']
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else:
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if sys.argv[1:]:
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qs = sys.argv[1]
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else:
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qs = ""
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environ['QUERY_STRING'] = qs # XXX Shouldn't, really
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return urllib.parse.parse_qs(qs, keep_blank_values, strict_parsing,
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encoding=encoding)
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# parse query string function called from urlparse,
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# this is done in order to maintain backward compatibility.
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def parse_qs(qs, keep_blank_values=0, strict_parsing=0):
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"""Parse a query given as a string argument."""
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warn("cgi.parse_qs is deprecated, use urllib.parse.parse_qs instead",
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DeprecationWarning, 2)
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return urllib.parse.parse_qs(qs, keep_blank_values, strict_parsing)
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def parse_qsl(qs, keep_blank_values=0, strict_parsing=0):
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"""Parse a query given as a string argument."""
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warn("cgi.parse_qsl is deprecated, use urllib.parse.parse_qsl instead",
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DeprecationWarning, 2)
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return urllib.parse.parse_qsl(qs, keep_blank_values, strict_parsing)
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def parse_multipart(fp, pdict, encoding="utf-8", errors="replace"):
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"""Parse multipart input.
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Arguments:
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fp : input file
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pdict: dictionary containing other parameters of content-type header
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encoding, errors: request encoding and error handler, passed to
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FieldStorage
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Returns a dictionary just like parse_qs(): keys are the field names, each
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value is a list of values for that field. For non-file fields, the value
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is a list of strings.
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"""
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# RFC 2026, Section 5.1 : The "multipart" boundary delimiters are always
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# represented as 7bit US-ASCII.
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boundary = pdict['boundary'].decode('ascii')
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ctype = "multipart/form-data; boundary={}".format(boundary)
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headers = Message()
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headers.set_type(ctype)
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headers['Content-Length'] = pdict['CONTENT-LENGTH']
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fs = FieldStorage(fp, headers=headers, encoding=encoding, errors=errors,
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environ={'REQUEST_METHOD': 'POST'})
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return {k: fs.getlist(k) for k in fs}
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def _parseparam(s):
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while s[:1] == ';':
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s = s[1:]
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end = s.find(';')
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while end > 0 and (s.count('"', 0, end) - s.count('\\"', 0, end)) % 2:
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end = s.find(';', end + 1)
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if end < 0:
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end = len(s)
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f = s[:end]
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yield f.strip()
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s = s[end:]
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def parse_header(line):
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"""Parse a Content-type like header.
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Return the main content-type and a dictionary of options.
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"""
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parts = _parseparam(';' + line)
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key = parts.__next__()
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pdict = {}
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for p in parts:
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i = p.find('=')
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if i >= 0:
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name = p[:i].strip().lower()
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value = p[i+1:].strip()
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if len(value) >= 2 and value[0] == value[-1] == '"':
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value = value[1:-1]
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value = value.replace('\\\\', '\\').replace('\\"', '"')
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pdict[name] = value
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return key, pdict
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# Classes for field storage
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# =========================
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class MiniFieldStorage:
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"""Like FieldStorage, for use when no file uploads are possible."""
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# Dummy attributes
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filename = None
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list = None
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type = None
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file = None
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type_options = {}
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disposition = None
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disposition_options = {}
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headers = {}
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def __init__(self, name, value):
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"""Constructor from field name and value."""
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self.name = name
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self.value = value
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# self.file = StringIO(value)
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def __repr__(self):
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"""Return printable representation."""
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return "MiniFieldStorage(%r, %r)" % (self.name, self.value)
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class FieldStorage:
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"""Store a sequence of fields, reading multipart/form-data.
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This class provides naming, typing, files stored on disk, and
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more. At the top level, it is accessible like a dictionary, whose
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keys are the field names. (Note: None can occur as a field name.)
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The items are either a Python list (if there's multiple values) or
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another FieldStorage or MiniFieldStorage object. If it's a single
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object, it has the following attributes:
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name: the field name, if specified; otherwise None
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filename: the filename, if specified; otherwise None; this is the
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client side filename, *not* the file name on which it is
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stored (that's a temporary file you don't deal with)
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value: the value as a *string*; for file uploads, this
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transparently reads the file every time you request the value
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and returns *bytes*
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file: the file(-like) object from which you can read the data *as
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bytes* ; None if the data is stored a simple string
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type: the content-type, or None if not specified
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type_options: dictionary of options specified on the content-type
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line
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disposition: content-disposition, or None if not specified
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disposition_options: dictionary of corresponding options
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headers: a dictionary(-like) object (sometimes email.message.Message or a
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subclass thereof) containing *all* headers
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The class is subclassable, mostly for the purpose of overriding
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the make_file() method, which is called internally to come up with
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a file open for reading and writing. This makes it possible to
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override the default choice of storing all files in a temporary
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directory and unlinking them as soon as they have been opened.
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"""
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def __init__(self, fp=None, headers=None, outerboundary=b'',
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environ=os.environ, keep_blank_values=0, strict_parsing=0,
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limit=None, encoding='utf-8', errors='replace',
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max_num_fields=None):
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"""Constructor. Read multipart/* until last part.
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Arguments, all optional:
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fp : file pointer; default: sys.stdin.buffer
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(not used when the request method is GET)
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Can be :
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1. a TextIOWrapper object
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2. an object whose read() and readline() methods return bytes
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headers : header dictionary-like object; default:
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taken from environ as per CGI spec
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outerboundary : terminating multipart boundary
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(for internal use only)
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environ : environment dictionary; default: os.environ
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keep_blank_values: flag indicating whether blank values in
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percent-encoded forms should be treated as blank strings.
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A true value indicates that blanks should be retained as
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blank strings. The default false value indicates that
|
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blank values are to be ignored and treated as if they were
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not included.
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strict_parsing: flag indicating what to do with parsing errors.
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If false (the default), errors are silently ignored.
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If true, errors raise a ValueError exception.
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limit : used internally to read parts of multipart/form-data forms,
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to exit from the reading loop when reached. It is the difference
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between the form content-length and the number of bytes already
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read
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encoding, errors : the encoding and error handler used to decode the
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binary stream to strings. Must be the same as the charset defined
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for the page sending the form (content-type : meta http-equiv or
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header)
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max_num_fields: int. If set, then __init__ throws a ValueError
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if there are more than n fields read by parse_qsl().
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"""
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method = 'GET'
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self.keep_blank_values = keep_blank_values
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self.strict_parsing = strict_parsing
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self.max_num_fields = max_num_fields
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if 'REQUEST_METHOD' in environ:
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method = environ['REQUEST_METHOD'].upper()
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self.qs_on_post = None
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if method == 'GET' or method == 'HEAD':
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if 'QUERY_STRING' in environ:
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qs = environ['QUERY_STRING']
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elif sys.argv[1:]:
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qs = sys.argv[1]
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else:
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qs = ""
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qs = qs.encode(locale.getpreferredencoding(), 'surrogateescape')
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fp = BytesIO(qs)
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if headers is None:
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headers = {'content-type':
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"application/x-www-form-urlencoded"}
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if headers is None:
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headers = {}
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if method == 'POST':
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# Set default content-type for POST to what's traditional
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headers['content-type'] = "application/x-www-form-urlencoded"
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if 'CONTENT_TYPE' in environ:
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headers['content-type'] = environ['CONTENT_TYPE']
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if 'QUERY_STRING' in environ:
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self.qs_on_post = environ['QUERY_STRING']
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if 'CONTENT_LENGTH' in environ:
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headers['content-length'] = environ['CONTENT_LENGTH']
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else:
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if not (isinstance(headers, (Mapping, Message))):
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raise TypeError("headers must be mapping or an instance of "
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"email.message.Message")
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self.headers = headers
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if fp is None:
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self.fp = sys.stdin.buffer
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# self.fp.read() must return bytes
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elif isinstance(fp, TextIOWrapper):
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self.fp = fp.buffer
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else:
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if not (hasattr(fp, 'read') and hasattr(fp, 'readline')):
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raise TypeError("fp must be file pointer")
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self.fp = fp
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self.encoding = encoding
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self.errors = errors
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if not isinstance(outerboundary, bytes):
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raise TypeError('outerboundary must be bytes, not %s'
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% type(outerboundary).__name__)
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self.outerboundary = outerboundary
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self.bytes_read = 0
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self.limit = limit
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|
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# Process content-disposition header
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cdisp, pdict = "", {}
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if 'content-disposition' in self.headers:
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cdisp, pdict = parse_header(self.headers['content-disposition'])
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self.disposition = cdisp
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self.disposition_options = pdict
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self.name = None
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if 'name' in pdict:
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self.name = pdict['name']
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self.filename = None
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if 'filename' in pdict:
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self.filename = pdict['filename']
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self._binary_file = self.filename is not None
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|
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# Process content-type header
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|
#
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# Honor any existing content-type header. But if there is no
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# content-type header, use some sensible defaults. Assume
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# outerboundary is "" at the outer level, but something non-false
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|
# 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
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# bogus clients which erroneously forget to include a content-type
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# header.
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#
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# See below for what we do if there does exist a content-type header,
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# but it happens to be something we don't understand.
|
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if 'content-type' in self.headers:
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ctype, pdict = parse_header(self.headers['content-type'])
|
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elif self.outerboundary or method != 'POST':
|
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ctype, pdict = "text/plain", {}
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else:
|
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ctype, pdict = 'application/x-www-form-urlencoded', {}
|
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self.type = ctype
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self.type_options = pdict
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if 'boundary' in pdict:
|
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self.innerboundary = pdict['boundary'].encode(self.encoding,
|
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self.errors)
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else:
|
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self.innerboundary = b""
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|
|
clen = -1
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if 'content-length' in self.headers:
|
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try:
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clen = int(self.headers['content-length'])
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|
except ValueError:
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pass
|
|
if maxlen and clen > maxlen:
|
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raise ValueError('Maximum content length exceeded')
|
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self.length = clen
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if self.limit is None and clen:
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self.limit = clen
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self.list = self.file = None
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self.done = 0
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if ctype == 'application/x-www-form-urlencoded':
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self.read_urlencoded()
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elif ctype[:10] == 'multipart/':
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self.read_multi(environ, keep_blank_values, strict_parsing)
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else:
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self.read_single()
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|
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def __del__(self):
|
|
try:
|
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self.file.close()
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|
except AttributeError:
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pass
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|
|
def __enter__(self):
|
|
return self
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|
|
def __exit__(self, *args):
|
|
self.file.close()
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|
|
def __repr__(self):
|
|
"""Return a printable representation."""
|
|
return "FieldStorage(%r, %r, %r)" % (
|
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self.name, self.filename, self.value)
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|
|
def __iter__(self):
|
|
return iter(self.keys())
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|
|
|
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
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else:
|
|
value = None
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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)
|
|
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)
|
|
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']
|
|
|
|
part = klass(self.fp, headers, ib, environ, keep_blank_values,
|
|
strict_parsing,self.limit-self.bytes_read,
|
|
self.encoding, self.errors, max_num_fields)
|
|
|
|
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 _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("&", "&") # Must be done first!
|
|
s = s.replace("<", "<")
|
|
s = s.replace(">", ">")
|
|
if quote:
|
|
s = s.replace('"', """)
|
|
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()
|