Ja, ja, es geht, danke.    work history (html) about me tajik bookmarks

Automatic redirection for del.icio.us 10th of August, 2006 POST·MERIDIEM 02:16

If you, like me, have often thought to yourself “bah, loading del.icio.us and clicking on the first link for a given tag combination is taking six seconds longer and 150% more attention than I’d like”, you’ll have realised that setting up automatic 302 redirection is not really an option for them, since automatic redirectors have become a tool for spammers to disguise dodgy URIs, and the service has open signups; there’s nothing to stop spammers abusing their accounts.

However, it is not trivially possible for a spammer to abuse my  del.icio.us account: that’s what the password is there for. So I’ve implemented automatic redirection based on tags for a single account, reading the data from an index made of a daily backup. http://​www.​parhasard.​net/​b/​dwb will redirect to the newest entry under del.icio.us/aidan with the tag DWB(in this case, the search page of the Grimms’ etymological dictionary at Universität Trier; note that in this implementation, ASCII in tags is case-insensitive, non-ASCII is case-sensitive); http://​www.​parhasard.​net/​b/​greek+language+καθαρεύουσα gives a synopsis of the current language situation in Greece, and so on.

To do this for your own del.icio.us account, you need shell access to a web server, several Perl modules, and DB4 support in PHP. To check for the Perl modules on the server, run this one-liner from a shell:

perl -e 'use DB_File; use Date::Parse; use Encode; use File::Temp; use HTTP::Request; use LWP::UserAgent; use XML::Parser'
If it completes without an error, you’re good. To check for the DB4 support, run this from a shell:
echo '<?php dba_open("/tmp/my-db-test", "c", "db4"); ?>' | php
Again, it needs to complete without an error for the scripts to work.

Source code for the backup script (which you need to create the index of tag => URI mappings) is here; source code for the redirect script is here. There are a few constants at the top of each file which you’ll need to modify; those with the same name need to be identical in the two files. You’ll also need to add a crontab(5) entry to keep the backup up-to-date; mine looks like:

23 5 * cd /www/parhasard.net/www/ && ./backup-del.icio.us.pl
and runs at 23 minutes past five every morning.

If your web server allows it, try adding the line AcceptPathInfo On to your .htaccess; without it, you’ll need to say http://​server-address/​b.​php?query=tag1+tag2+tag3 , which is much less comfortable.

Word of the day: inminente is Spanish for “imminent”; I love that the language community is scrupulously regularising enough that they abandoned the Latin orthographic change of <inm> -> <imm>.


It occurred to me ages ago, and it’s worth documenting here, that this can work for del.icio.us without being hi-jacked by spammers; it’s a matter of adding a check for the login cookie of the user whose bookmarks are being checked for the redirect.

Some HTML is allowed. Use Preview if you’re not sure that what you type will be.







 
Remember info: