(I wrote up the following this morning, and I still don't see any obvious
flaws, so I'll subject it to your criticism.)
A map file is a list containing two columns, an absolute filename and a
CHK. For example:
Mapfile
/images/duck.gif freenet:CHK@ABC
/chapter_01/index.html freenet:CHK@DEF
/chapter_01/cat.jpg freenet:GHI
/warez/photoshop.zip freenet:CHK@JKL
/blah.html freenet:CHK@MNO
The map file is inserted under any key. Most map files will be small
enough to insert directly within a non-CHK key. Really big ones may be
accessed directly from CHKs (as can smaller ones, of course, which may be
desirable for increased security) or redirected to from other keytypes.
We must delimit the filename with a character that's not permitted in any
key. I vote for the colon, because the "@" and the comma are used in the
body of the key, while the colon merely separates the "freenet:" from the
actual key. For example,
"freenet:CHK@rE9zY9IVJAqGZInGOF0d03L6ZeoOAwE,nmrAmhCGI3EBnKMALocq7A:/images/duck.gif",
"freenet:SSK@2tDoEptUv7jxljM2pF2mwABsswsQAgE/10-24-2000:/images/duck.gif",
and even (especially!) the elegant and guessable
"freenet:markjroberts:/images/duck.gif" would be valid keys. I believe
the slash after the colon is required so the browser knows what's up
(otherwise, it's superfluous).
FProxy downloads the map file. It looks up the filename after the
delimiter and requests and returns its CHK. Finally, it caches the map
file for a reasonable amount of time, maybe one hour. (If the map is
accessed again, the time limit resets.)
This is really easy to implement, and it's a great improvement over
redirecting from a SSK for every single file. It permits guessable keys to
be used for file hierarchies without a Javascript redirect. Furthermore,
when updating is implemented, a mapped file hierarchy could be easily
implemented on top of an updatable SVK. Only one file would need to be
updated, as opposed to every file in a SSK hierarchy. This saves time for
the inserter, enhances reliability, and avoids unnecessary reliance on the
updating mechanism (you just update the map file with new CHKs).
--
Mark Roberts
[EMAIL PROTECTED]
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