#!/usr/bin/python
#
# File: Environment.py
# Author: Angus McIntyre
# Date: 23.08.2000
# Updated: 28.08.2000
#
# A Python script to display the values of environment variables set by the
# server. These variables provide information about the user, the software
# they are using, the context of execution etc. This script is intended as
# an aid to debugging. The script was originally written in Perl.
#
# ---------------------------------------------------------------------------
# REVISION HISTORY
#
# 23.08.2000 SLAM First implementation.
#
# ---------------------------------------------------------------------------
# LEGAL NOTICE
#
# This script may be freely copied, distributed and modified. Use of the
# script is at the risk of the user. The script is presented "as-is" without
# any warranty, and the author is not liable for any loss or damages arising
# out of the use of or failure to use this script. This notice must appear
# in any modified copy of the script in which the name of the original
# author also appears.
# ---------------------------------------------------------------------------
# ---------------------------------------------------------------------------
# IMPORTS
# ---------------------------------------------------------------------------
import os
import re
# ---------------------------------------------------------------------------
# CONSTANTS
# ---------------------------------------------------------------------------
# table_header_color - color used to print the table header background
table_header_color = "#9999FF"
# table_cell_color - color used to print the background of table cells
table_cell_color = "#DDDDFF";
# allowable_variables_pattern - pattern used to determine which variables
# should be printed. This can be used to restrict the amount of (potentially
# sensitive) information returned by the script. The pattern below lists the
# key Web-related variables.
#
# The regular expression is precompiled at the moment of definition for
# efficiency purposes.
allowable_variables_pattern = re.compile("HTTP|SERVER|REQUEST_METHOD|QUERY_STRING")
# ---------------------------------------------------------------------------
# FUNCTIONS
# ---------------------------------------------------------------------------
# allowed_to_print
#
# Determine if the script is allowed to print the value for a particular
# variable. The variable is checked against a (compiled) regular expression:
# if it matches, the function returns true.
def allowed_to_print(varname):
match = allowable_variables_pattern.match(varname)
return match
# ---------------------------------------------------------------------------
# MAIN
# ---------------------------------------------------------------------------
# Print the HTTP response header and then the first part of the HTML text
# making up the page.
print 'Content-type: text/html\n\n\
\n\
\n\
\n\
Environment Variables\n\
\n\
\n\
Environment Variables
\n\
\n\
\n\
| Variable | \n\
Value
| \n\
'
# Loop through the environment variables, printing each one in turn as
# a table row. Because we use a '
' after each value, this should be
# legible even on older browsers.
for e in os.environ.items():
if allowed_to_print(e[0]):
print ''
print '| '
print e[0] + ': | '
print e[1] + '
|
'
# Print the page trailer to close off the page.
print "
\n"