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copyright message at the end of each text file To accomplish this, you need to do two things First, add the following directive in httpdconf file:
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Action plain/text /cgi-bin/textfilterpl
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Then, develop the Perl script textfilter which will display the text file the way you wish Listing 5-1 shows one such script You can find this script on the accompanying CD-ROM in the Scripts/ 5 directory
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Listing 5-1: textfilterpl
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#!/usr/bin/perl # # Script: textfilterpl # # Purpose: This filter script converts plain text files # into an HTML document but keeps the text layout # as is # # Copyright (c) 2001 by Mohammed J Kabir # # License: GPL # # The copyright message file is always stored in # the server s document root # directory and is called copyrighthtml # my $copyright_file = $ENV{DOCUMENT_ROOT} /copyrighthtml ; # Get the requested document s path my $path_translated = $ENV{PATH_TRANSLATED}; # Other variables needed for storing data my $line; my @text; my @html; # Store the path info and the file name of requested doc in an array @filename = split(/\//,$path_translated); # Because HTML tags are used to display the text file, # lets print the text/html content header print Content-type: text/html\n\n ; # Read the document requested and store the data # in @text array variable
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Continued
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Part I Getting Started
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Listing 5-1 (continued)
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@text = &readFile($path_translated); # Now print the following HTML document tags # These tags will be sent before the actual document content # print <<HEAD; <HTML> <HEAD> <TITLE>$filename[-1] </TITLE> </HEAD> <BODY BGCOLOR= white > <BLOCKQUOTE> <PRE> HEAD # Now print each line stored in the @text array # (that is, the content of the document requested) # foreach $line (@text) { print $line; } # Now read the copyright file and store the content # in the @html array variable # @html = &readFile($copyright_file); # Print each line stored in the @html array (that is, # the content of the copyright message file) # foreach $line (@html){ print $line; } # Exit the filter exit 0; sub readFile { # # Subroutine: readFile # Purpose: Reads a file if it exists or else prints # an error message and exits script # # Get the name of the passed file name and store # it in variable $file my $file = shift; # Local buffer variable my @buffer; # If the file exists, open it and read all the # lines into the @buffer array variable if(-e $file) { open(FP,$file) || die Can not open $file ; while(<FP>){
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push(@buffer,$_); } close(FP); } else { push(@buffer, $file is missing ); } # Return the content of the buffer return (@buffer); }
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The preceding script reads the requested text file and prints out the content inside a few HTML tags that enable the content to be displayed as is This is accomplished by using the HTML tag <PRE> After the content is printed, the copyright message file content is inserted at the end of the output This enables a copyright message to be printed with each requested text file Figure 5-1 shows an example output where a text file is being displayed on the Web browser
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Figure 5-1: Output of textfilterpl
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As you can see, the requested filename appears as the title The document is block quoted, and a custom copyright message is printed The copyright message file is stored in the document s root directory The file used in this example is:
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</PRE> <BLOCKQUOTE> <CENTER> <HR> Copyright (c) 2001 Mohammed J Kabir (kabir@mobidaccom}) </CENTER> </BODY> </HTML>
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Script
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The Script directive is like the Action directive, but instead of associating an action with a MIME-type, it associates the action with an HTTP request such as GET, POST, PUT, or DELETE The CGI script receives the URL and file path of the requested document using the standard CGI PATH_INFO and PATH_TRANSLATED environment variables Syntax: Script method cgi-script Context: Server config, virtual host, directory This directive defines default action In other words, if you have defined the following:
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