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Re: [Gnumed-devel] gnumed ideas 0.1 and post-0.1 (was Time for a major r

From: catmat
Subject: Re: [Gnumed-devel] gnumed ideas 0.1 and post-0.1 (was Time for a major re-think in 2005)
Date: Thu, 27 Jan 2005 08:32:29 +1100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041231 


Ian Haywood wrote:


If not, is there any interest in a Web client
in Python? The BaseHTTPServer class provides the same features as Java servlets only heaps easier to use. 


I thought I'd use this to revise apache server.
I was trying to do a web login page using python as a cgi script.

this was what was in /etc/httpd/commonhttpd.conf


Directory /home/*/public_html>
    AllowOverride All
    Options MultiViews +Indexes Includes +FollowSymLinks
    <IfModule mod_access.c>
      Order allow,deny
      Allow from all
    </IfModule>
</Directory>


<Directory /home/*/public_html/cgi-bin>
    Options ExecCGI
    AllowOverride All
    SetHandler cgi-script
    <IfModule mod_access.c>
      Order allow,deny
      Allow from all
    </IfModule>
</Directory>


<Directory /home/*/public_html/gnumed>
        Options
        AllowOverride All
        <IfModule mod_access.c>
          Order allow,deny
          Allow from all
        </IfModule>
</Directory>


The important Option is ExecCGI  in  /home/*public_html/cgi-bin,
which allows CGI scripts to execute in that directory.



attached are the files
~/public_html/gnumed/login.html, ~/public_html/cgi-bin/login.py , ~/public_html/cgi-bin/checkpath.py 

notice login.py begins with
#! /usr/local/bin/python2.4

to specify what program is the scripting engine.
An important point is that apache server uses the unix file and directory permissions.
I had to do chmod (change mode) 0755 ( which is permissions user: rwx group: r-x others: r-x , r is 4 , w is 2, and x is 1 , so 4 ORed with 1 is 5 ) This has to be performed on all the directories below where the gnumed client python files are kept from home/$user upwards to the directory below the python files needing to be executed and including 
those files. ( e.g. gmLoginInfo, gmLog)
Also, since gmLog creates a log file for gmLoginInfo, it seemed to want to create as /var/www/.login/login.log 
therefore had to
 create /var/www/.login and login.log ,
 chmod 0745 /var/www/.login  , and
 chown apache /var/www/login.log,
to get the existing gnumed backend stuff to run as imports into the python cgi script.
The main idea is that apache server runs as user apache, which is effectively in group others, so x (execute) permission for others has to be set , in order to access the directories , and execute the python files, and any files written to by any python script need to pre-exist with apache as owner 
(so can read and write).
This is probably pretty basic to people used to apache, but it's here for revision if needed. Also , I wasted a few hours trying to figure out why the backend wouldn't import.

Login

username password 
#!/usr/local/bin/python2.4
debug = True 
import sys, cgi
import cgitb
cgitb.enable()

#cgi.test()
print "Content-type: text/html"
print
print "<html><body>"
import checkpath
print sys.builtin_module_names
print sys.path
try:
        from Gnumed.pycommon import gmLoginInfo
        print "imported gmLoginInfo"
except:
        raise
        print "<h4>unable to load gmLoginInfo</h4>"
f = cgi.FieldStorage()
if not f.has_key("username"):
        print "Error: missing username"
elif not f.has_key("password"):
        print "Error: missing password"
else:
        if debug:
                
                u = cgi.escape(f["username"].value)
                p = cgi.escape( f["password"].value)
                #u=f["username"].value
                #p =f["password"].value
                                
                print "username=", u
                print "<br>"
                print "password=", p

print "</body></html>"

import sys
path="/home/sjtan/projects/gnumed4/gnumed/gnumed"
if path not in sys.path:
        sys.path.insert(0,path)
        pass
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