replacing specific lines in a file Post: 302091154

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cgi::application::mailform

CGI::Application::Mailform(3)				User Contributed Perl Documentation			     CGI::Application::Mailform(3)

NAME

       CGI::Application::Mailform - A simple HTML form to email system

SYNOPSIS

	 ## In "mailform.cgi" --
	 use CGI::Application::Mailform;

	 # Create a new Mailform instance...
	 my $mf = CGI::Application::Mailform->new();

	 # Configure your mailform
	 $mf->param('MAIL_FROM'   => 'webmaster@your.domain');
	 $mf->param('MAIL_TO'	  => 'form_recipient@your.domain');
	 $mf->param('HTMLFORM_REDIRECT_URL' => '/uri/or/url/to/mailform.html');
	 $mf->param('SUCCESS_REDIRECT_URL'  => '/uri/or/url/to/thankyou.html');
	 $mf->param('FORM_FIELDS' => [qw/name address comments etc/]);

	 # Optional variables
	 $mf->param('SMTP_HOST'   => 'mail.your.domain');
	 $mf->param('SUBJECT'	  => 'New form submission');
	 $mf->param('ENV_FIELDS'  => [qw/REMOTE_ADDR HTTP_USER_AGENT/]);

	 # Now run...
	 $mf->run();
	 exit(0);

	 ## In "mailform.html" --
	 <form action="mailform.cgi">
	 <input type="hidden" name="rm" value="submitform">
	 <!-- Your HTML form input fields here -->
	 <input type="submit" name="submit">
	 </form>

	 ## In "thankyou.html" --
	 <html><body>
	   <h1>Thanks for your submission!  It has been sent.</h1>
	 </body></html>

DESCRIPTION

       CGI::Application::Mailform is a reusable and customizable mailform for the web.	It is intentionally simple, and provides very few
       facilities.  What it does do is provide an easy-to-use, secure system for taking the contents of a HTML form submission and sending it, via
       email, to a specified recipient.

       This module was created as an example of how to use CGI::Application, a framework for creating reusable web-based applications.	In
       addition to providing a simple example of CGI::Application's usage, CGI::Application::Mailform is also a fully functional application,
       capable of running in a production environment.

       Just as is the case with any web-application built upon CGI::Application, CGI::Application::Mailform will run on any web server and
       operating system which supports the Common Gateway Interface (CGI).  It will run equally well on Apache as it runs on IIS or the iPlanet
       server.	It will run perfectly well on UNIX, Linux, Solaris or Windows NT.  It will take full advantage of the advanced capabilities of
       MOD_PERL.  It will probably even run under FastCGI (although the author has not personally tested it in that environment).

   USAGE
       Once CGI::Application::Mailform has been installed, you must complete the following steps to create a custom mailform on your website:

	 1. Create 'mailform.html'
	 2. Create 'thankyou.html'
	 3. Create 'mailform.cgi'

       Examples of these files are provided in the directory "Examples" which can be found in the installation tar file for CGI::Application.

   Create 'mailform.html'
       The file 'mailform.html' is simply an HTML file which contains your web form.  This is the form whose contents will be sent, via
       CGI::Application::Mailform, to the specified recipient's email address.

       This file need only contain the basic HTML form.  There are two requirements for this form.  First, the "action" attribute of the <form>
       element must refer to the CGI instance script ('mailform.cgi') you are about to create.	Second, the form must set a "hidden" form field
       with the name "rm" and the value "submitform".  This hidden parameter is what tells the CGI::Application::Mailform application to send the
       email message, as opposed to send the user to the HTML form.

       For example:

	   <form action="mailform.cgi">
	   <input type="hidden" name="rm" value="submitform">
	   <!-- Your HTML form input fields go here -->
	   </form>

       Your 'mailform.html' may also contain JavaScript to provide form validation.  The CGI::Application::Mailform does not (currently) have any
       internal form validation capabilities.  As described earlier, this is a very simple system.  If it is necessary to enforce any fields as
       "required", it is recommended that JavaScript be used.

       NOTE:  It is not necessary that your HTML file be called 'mailform.html'.  You may name this file anything you like.  The only naming
       limitation is that the name of this file should be correctly referenced in your 'mailform.cgi', in the variable 'HTMLFORM_REDIRECT_URL'.

   Create 'thankyou.html'
       The next file you need to create is your 'thankyou.html' file.  This file is the simplest of all.  This is the file to which users will be
       redirected once they have successfully submitted their form data.  The purpose of this screen is to inform and assure the user that their
       form data submission has been successfully received and processed.

       For example:

	   <html>
	   <head>
	       <title>Thank you!</title>
	   </head>
	   <body>
	       <p><h1>Thanks for your submission!</h1></p>
	       <p>We have received your form, and
	       we will get back to you shortly.</p>
	   </body>
	   </html>

       NOTE:  It is not necessary that your HTML file be called 'thankyou.html'.  You may name this file anything you like.  The only naming
       limitation is that the name of this file should be correctly referenced in your 'mailform.cgi', in the variable 'SUCCESS_REDIRECT_URL'.

   Create 'mailform.cgi'
       The file 'mailform.cgi' is where all the functionality of CGI::Application::Mailform is configured.  This file is referred to as a "CGI
       instance script" because it creates an "instance" of your form.	A single website may have as many instance scripts as needed.  All of
       these instance scripts may use CGI::Application::Mailform.  They may each use a different form (with different fields, etc.) if desired.
       The ability to create multiple instances of a single application, each with a different configuration is one of the benefits of building
       web-based applications using the CGI::Application framework.

       Your instance script, 'mailform.cgi', must be created in such a way that it is treated by your web server as an executable CGI application
       (as opposed to a document).  Generally (on UNIX), this entails setting the "execute bit" on the file and configuring your web server to
       treat files ending ".cgi" as CGI applications.  Please refer to your particular web server's manual for configuration details.

       Your instance script 'mailform.cgi' must start with the following:

	   #!/usr/bin/perl -w
	   use CGI::Application::Mailform;
	   my $mf = CGI::Application::Mailform->new();

       These lines invoke the Perl interpreter, include the CGI::Application::Mailform module, and instantiate a Mailform object, respectively.
       (The author assumes your Perl binary is located at "/usr/bin/perl".  If it is not, change the first line to refer to the correct location
       of your Perl binary.)

       Once you have a Mailform object ($mf), you have to configure the Mailform for your particular application.  This is done by using the
       param() method to set a number of variables.  These variables are specified as follows.

       REQUIRED VARIABLES

       MAIL_FROM
	     $mf->param('MAIL_FROM' => 'webmaster@your.domain');

	   This variable specifies the email address from which the email created by this mailform will appear to be sent.  This can be any
	   address you like.  Typically, this will be "webmaster@your.domain".	Keep in mind, this is the address to which a bounce or a reply
	   will be sent if one is generated as a result of the mailform email.	The MAIL_FROM can also be useful for assisting the recipient of
	   these email messages in automatically filtering and organizing the submissions they receive.

	   This variable is required.  If not specified, CGI::Application::Mailform will die() with appropriate errors.

       MAIL_TO
	     $mf->param('MAIL_TO' => 'form_recipient@your.domain');

	   This variable specifies the email address to which the email created by this mailform should be sent.  This should be the email address
	   of the person to whom the form contents should be emailed.  This person will receive a reasonably formatted message every time this
	   mailform is submitted.

	   This variable is required.  If not specified, CGI::Application::Mailform will die() with appropriate errors.

       HTMLFORM_REDIRECT_URL
	     $mf->param('HTMLFORM_REDIRECT_URL' => '/uri/or/url/to/mailform.html');

	   This variable specifies the URL (or URI) to which the web user should be redirected before they have submitted the mailform.  This
	   should be the HTML form which the user fills out, the contents of which will be emailed once they are submitted.

	   This variable is required.  If not specified, CGI::Application::Mailform will die() with appropriate errors.

       SUCCESS_REDIRECT_URL
	     $mf->param('SUCCESS_REDIRECT_URL' => '/uri/or/url/to/thankyou.html');

	   This variable specifies the URL (or URI) to which the web user should be redirected once they have submitted the mailform.  Typically,
	   this would be a "thank you" screen which assures the user that their form submission has been received and processed.

	   This variable is required.  If not specified, CGI::Application::Mailform will die() with appropriate errors.

       FORM_FIELDS
	     $mf->param('FORM_FIELDS' => [qw/name address comments etc/]);

	   This variable specifies the list of HTML form fields which will be processed and sent via email to the specified recipient.	Only the
	   form fields specified in this list will be put in the email message which is generated by this mailform and sent to the specified
	   recipient.

	   The value of this variable must be an array reference.  This variable is required.  If not specified, CGI::Application::Mailform will
	   die() with appropriate errors.

       OPTIONAL VARIABLES

       SMTP_HOST
	     $mf->param('SMTP_HOST' => 'mail.your.domain');

	   This variable specifies the Internet host name  (or IP address) of the server which provides Simple Mail Transfer Protocol (SMTP)
	   services.  CGI::Application::Mailform sends all mail via SMTP using Net::SMTP.

	   If SMTP_HOST is unspecified, Net::SMTP will use the default host which was specified when Net::SMTP was installed.  If
	   CGI::Application::Mailform is unable to make an SMTP connection, or successfully send mail via the SMTP host, it will die() with
	   appropriate errors.

       SUBJECT
	     $mf->param('SUBJECT' => 'New form submission');

	   This variable specifies the subject line of the email message which is created by this mailform.  The subject is useful to the mailform
	   recipient in easily recognizing (and possibly filtering) form submissions.

	   This variable is optional.  If not supplied, CGI::Application::Mailform will set the subject to a reasonable default.

       ENV_FIELDS
	     $mf->param('ENV_FIELDS'  => [qw/REMOTE_ADDR HTTP_USER_AGENT/]);

	   This variable specifies the list of "environment" variables which will be processed and sent via email to the specified recipient.
	   Only the environment variables specified in this list will be put in the email message which is generated by this mailform and sent to
	   the specified recipient.

	   Any environment variable which is present in the CGI environment may be included.  Typical variables might be:

		   AUTH_TYPE
		   CONTENT_LENGTH
		   CONTENT_TYPE
		   GATEWAY_INTERFACE
		   HTTP_ACCEPT
		   HTTP_USER_AGENT
		   PATH_INFO
		   PATH_TRANSLATED
		   QUERY_STRING
		   REMOTE_ADDR
		   REMOTE_HOST
		   REMOTE_IDENT
		   REMOTE_USER
		   REQUEST_METHOD
		   SCRIPT_NAME
		   SERVER_NAME
		   SERVER_PORT
		   SERVER_PROTOCOL
		   SERVER_SOFTWARE

	   See your web server documentation for a complete list and descriptions of the available environment variables.  The list of environment
	   variables specified by the CGI protocol can be found at the following URL:

	       http://hoohoo.ncsa.uiuc.edu/cgi/env.html

	   The value of this variable must be an array reference.  This variable is optional.  If not specified, no environment variables will be
	   included in the mailform email message.

       Finally, you must actually cause your Mailform to be executed by calling the run() method.  Your instance script 'mailform.cgi' should end
       with the following lines:

	   $mf->run();
	   exit(0);

       These lines cause your configured Mailform ($mf) to be executed, and for the program to cleanly exit, respectively.

       NOTE:  It is not necessary that your HTML file be called 'mailform.cgi'.  You may name this file anything you like.  The only naming
       limitations are that this file should be named so that your web server recognizes it as an executable CGI, and that your 'mailform.html'
       file specifies your instance script in the "action" attribute of the <form> element.

       All things considered, your CGI instance script will be a very small, simple file.  Unlike other reusable "mailform" scripts, the instance
       scripts are specifically intended to be very easy to work with.	Essentially, these instance scripts are "configuration files" for your
       web-based application.  The structure of instance scripts is a benefit of building applications based on the CGI::Application framework.

SEE ALSO

       CGI::Application

AUTHOR

       Jesse Erlbaum <jesse@erlbaum.net>

LICENSE

       Copyright (c) 2001, 2002, Jesse Erlbaum <jesse@erlbaum.net>.

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.12.1							    2009-07-30					     CGI::Application::Mailform(3)