# Blosxom Plugin: nixie # Author: Stu MacKenzie # Version: v0.4 2005-05-22 # License: MIT/Public Domain # nixie home: http://www.enilnomi.net/download.html # Documentation at the bottom of this file or type: perldoc nixie # "nixie", noun, pl. nixies. # (U.S. Slang.) a letter or other mail that is not # delivered because of an illegible or incorrect address. # # When blosxom displays no stories, nixie adds a user-specified # "404"-type message to the head, via flavour file. Optionally, # the plugin can be set to "throw a real 404" (server log will # show a 404 error). Defaults to built-in "real" 404 when no # flavour files are present. Works with any blosxom URL: # path-based, date-based, or mixed (e.g. /pets/dogs/2005). package nixie; # = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = # # Configuration Section # # = = = = = = = = = = = = = = = = # # Setting your empty-page message -- # Your "file not found" message will be appended to the current # head template, so use all your normal styling, DIVs, etc. Enter # your message in a flavour file named "nixie.head.flavour_name" # (no quotes), in any of the spots you normally keep flavour files. # A file named "nixie.head.all" (no quotes) works with any flavour. # # Should nixie throw a "real" 404? # When set to 0 (normal), the plugin adds your "file not found" # message to the normal blosxom page; when set to 1, the entire # blosxom page is dumped -- including http header -- and a new # page is generated with header status set to 404. This may # prevent robots from recording "empty" pages...I dunno. It'll # definitely show on your server log as a 404. $throw_a_real_404 = 0 unless defined $throw_a_real_404; # # Setting your 404 message -- # When $throw_a_real_404 is set to 1, you have to supply an # entire page as your "message." This page can be saved as a # flavour file, named "404.head.flavour_name" or "404.head.all" # (no quotes), located at the top of your datadir. A default # 404 flavour is built in to the plugin. # # Environment Variables -- # Your 404 templates can use $nixie::server_port, $nixie::server_name, # $nixie::server_software, $nixie::server_protocol, and $nixie::url # (And, of course, all the normal blosxom variables.) # # = = = = = = = = = = = = = = = = use strict; use CGI qw/:standard/; use vars qw { $server_port $server_name $server_software $server_protocol $url $throw_a_real_404 }; my $counter = 0; my $template; my $current_dir; my $mark; sub start { 1; } sub head { my ($pkg, $dir, $head_ref) = @_; $mark = rand(7); # add a (99.999) unique mark to $head while ($$head_ref =~ m/$mark/) {$mark += rand(7);} $mark = ""; $$head_ref .= $mark; $url = path_info(); $current_dir = $dir; 1; } sub story { $counter++; # record number of stories processed } sub get_default { # read in the default 404 template my $str = ""; while () { #last if /^(__END__)?$/; last if /^(__END__)$/; $str .= $_; } $str; } sub last { $counter and # if *any* stories were processed, $blosxom::output =~ s/$mark// and # delete our mark and we're done return 1; $server_software = $ENV{"SERVER_SOFTWARE"}; $server_software =~ s/\D*$//; $server_name = $ENV{"SERVER_NAME"}; $server_port = $ENV{"SERVER_PORT"}; $server_protocol = $ENV{"SERVER_PROTOCOL"}; # load a template my $chunk = $throw_a_real_404 ? '404.head' : 'nixie.head'; $template = $blosxom::template->($current_dir, $chunk, $blosxom::flavour); $template ||= $blosxom::template->('', $chunk, "all"); $template or $throw_a_real_404 = 1; $template ||= get_default(); $template ||= '404 Not FoundPage Not Found'; $template = &$blosxom::interpolate($template); if ($throw_a_real_404) { # to throw a real 404, replace blosxom's $blosxom::output = $template; # output and http header; print "Status: 404\n"; # else just swap our message into head } else {$blosxom::output =~ s/$mark/$template/;} 1; } 1; __DATA__ 404 Not Found

Not Found

The requested URL $nixie::url was not found on this server.


$nixie::server_software Server at $nixie::server_name Port $nixie::server_port
__END__ =head1 NAME Blosxom plug-in: nixie =head1 SYNOPSIS When blosxom processes no stories -- due to a bad link, bad typing, bad karma, etc. -- nixie steps in and adds a user-specified "file not found" message to the empty page. Messages are saved in flavour files, on a per-flavour, per-category basis; a generic flavour can also be used. Optionally, nixie can generate a "real 404" which will show up in server logs; the 404 page is saved in flavour files, as above. In the absence of any flavour files, nixie provides a default 404 page. =head1 INSTALLATION Enter configuration info as instructed, then drop this file into your blosxom plugins folder. Blog on. =head1 CONFIGURATION With any luck, the instructions in the "Configuration Section" at the top of this file are sufficient; if more information is needed, see the documentation at: http://www.enilnomi.net/dltext/nixie.dl =head1 USAGE =head2 Blog page, or 404 page? nixie can react to an "empty" blog page in one of two ways. When $throw_a_real_404 is set to 0 (termed "normal"), the normal blog page will display, with your "file not found" message appearing where stories would normally display. In all other regards the page will be a "normal" blog page, and your server log will record the url as Status 200 (no problems). When $throw_a_real_404 is set to 1, the normal blog page is discarded and a new page is generated, complete with a "404" http header; your server log will record the url as Status 404. =head2 Flavour files You don't have to modify your existing flavour files at all to use nixie; your "file not found" message will be added automagically. You do, however, have to make up a message. Typically, this will include: a prominent notice that the requested page doesn't exist; a brief explanation of how this might have happened; and link back to a "good" page. File-not-found messages for a "normal" blog page should be saved in files named "nixie.head.flavour_name" (no quotes), where flavour_name is one of your existing flavours. No other plugins will process this message, so make sure it's properly marked up. These "nixie.head.flavour_name" files work just like normal flavour files -- they are used on a per-flavour, per- directory basis. If one message will work for all your flavours, you can save your message in a file named "nixie.head.all"(no quotes); the file must reside at the top of your datadir. When opting to produce a "real" 404 page, your flavour file must contain a complete page -- "......... .........". Save your 404 page in file named "404.head.flavour_name" (no quotes), where flavour_name is one of your existing flavours. No other plugins will process this page, so make sure it's properly marked up. These "404.head.flavour_name" files work just like normal flavour files -- they are used on a per-flavour, per-directory basis. If one 404 page will work for all flavours, you can save your page in a file named "404.head.all" (no quotes); the file must reside at the top of your datadir. If you are truly lazy, you'll just let the built-in generic 404 template produce your page (no flavour files required); if you're a little bit ambitious, you'll modify the default template to match your server's normal 404 page ;-) B, if no flavour files are available the built-in 404 template will be used to generate a page, and a "404" header will be sent. =head2 Environment variables You can use $nixie::server_protocol, $nixie::server_software, $nixie::server_name, $nixie::server_port, and $nixie::url in your flavour files. Since nixie flavours are interpolated by blosxom, you can also use all the normal blosxom variables. =head1 BUGS Address bug reports and comments to the Blosxom mailing list: http://www.yahoogroups.com/group/blosxom =head1 VERSION 2005-05-02 (v0.4) - it's alive =head1 LICENSE this Blosxom Plug-in Copyright 2005, Stu MacKenzie Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.