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<H1><A NAME="SECTION005400000000000000000"> </A>
<BR>
3.4 Publisher Handler Makes it Easy
</H1>
<P>
At this point you may be wondering if mod_python is all that useful
after all. You may find yourself asking: "If there can only be one
handler per directory, how am I to structure my application?"
<P>
Enter the <code>publisher</code> handler provided as one of the standard
mod_python handlers. To get the publisher handler working,
you will need the following lines in your config:
<P>
<dl><dd><pre class="verbatim">
AddHandler python-program .py
PythonHandler mod_python.publisher
</pre></dl>
<P>
The following example will demonstrate a simple feedback form. The
form will ask for the name, e-mail address and a comment and the
will construct an e-mail to the webmaster using the information
submitted by the user.
<P>
Here is the html for the form:
<P>
<dl><dd><pre class="verbatim">
<html>
Please provide feedback below:
<p>
<form action="form/email" method="POST">
Name: <input type="text" name="name"><br>
Email: <input type="text" name="email"><br>
Comment: <textarea name="comment" rows=4 cols=20></textarea><br>
<input type="submit">
</form>
</html>
</pre></dl>
<P>
Note the <code>action</code> element of the <code><form></code> tag points to
<code>form/email</code>. We are going to create a file called <span class="file">form.py</span>,
like this:
<P>
<dl><dd><pre class="verbatim">
import smtplib
def email(req, name, email, comment):
# see if the user provided all the parameters
if not (name and email and comment):
return "A required parameter is missing, \
please go back and correct the error"
# create the message text
msg = """\
From: %s
Subject: feedback
To: webmaster
I have the following comment:
%s
Thank You,
%s
""" % (email, comment, name)
# send it out
conn = smtplib.SMTP("localhost")
conn.sendmail(email, ["webmaster"], msg)
conn.quit()
# provide feedback to the user
s = """\
<html>
Dear %s,<br>
Thank You for your kind comments, we
will get back to you shortly.
</html>""" % name
return s
</pre></dl>
<P>
When the user clicks the Submit button, the publisher handler will
load the <tt class="function">email</tt> function in the <tt class="module">form</tt> module,
passing it the form fields as keyword arguments. Note that it will
also pass the <tt class="class">Request</tt> object as <code>req</code>. Note also that
you do not have to have <code>req</code> as one of the arguments if you do
not need it. The publisher handler is smart enough to pass your function
only those arguments that it will accept.
<P>
Also notice how it sends data back to the customer - via the return
value of the function.
<P>
And last, but not the least, note how all the power of mod_python
is still available to this function, since it has access to the
<tt class="class">Request</tt> object. You can do all the same things you can do
with a "native" mod_python handler, e.g. set custom headers via
<code>req.headers_out</code>, return errors by raising
<tt class="exception">apache.SERVER_ERROR</tt> exceptions, write or read directly
to and from the client via <tt class="method">req.write</tt> and <tt class="method">req.read</tt>,
etc.
<P>
Read Section <A href="hand-pub.html#hand-pub">6.1</A> <em class="citetitle"><a
href="hand-pub.html"
title="Publisher Handler"
>Publisher Handler</a></em>
for more information on the publisher handler.
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<span class="release-info">Release 2.7.10, documentation updated on December 07, 2003.</span>
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