#!/usr/bin/python
import cgi

# Supports writing to the info.dat file. This cgi
# script gets parameter data from an XPort or other
# embedded device, and writes it out to the info.dat
# file, so long as the 'user' parameter is in the
# allowed.dat file

def isAllowed(user=None):
    """Checks to see that the given user name
        is in the allowed.dat file"""

    if user == None:
        return False
    
    allowedFile = open("allowed.dat", 'r')
    allowed = []
    for name in allowedFile.readlines():
        allowed.append(name.strip())
    allowedFile.close()
        
    if user in allowed:
        return True
    else:
        return False


def writeMessage(user=None, message="Default"):
    """Writes a message to the info.dat file, with the
        parameters user:time:message"""
    
    # read in the whole info.dat file
    userInfoFile = open("info.dat", 'r')
    userInfo = []
    for line in userInfoFile.readlines():
        parts = line.split(':')
        if len(parts) == 2:
            userInfo.append(parts)
        
    userInfoFile.close()
            
    # parse out the entries to find the appropriate one
    written = False
    for datum in userInfo:
        if datum[0] == user:
            datum[1] = message
            written = True
            
    if not written:
        userInfo.append([user, message])
            
    
    # replace the entry with the new value
    userInfoFile = open("info.dat", 'w')
    for datum in userInfo:
        if len(datum) == 2:
            userInfoFile.write("%s:%s\n" % (datum[0], datum[1].strip()))
        
    userInfoFile.close()

params = cgi.FieldStorage()

print "Content-type: text/html\n\n"

user = None
message = None

if params.has_key("user"):
    user = params["user"].value

if params.has_key("msg"):
    message = params["msg"].value

if isAllowed(user):
    # write the data
    writeMessage(user, message)
    print "ok"
else:
    print "not ok"