On Sun, Dec 24, 2000 at 07:06:02PM -0600, Mark J. Roberts wrote:
> (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).
This is suboptimal to a subspace because files can be added later to a
subspace, while all the files have to already be specified for this
(but they don't have to *exist* yet).
--
Travis Bemann
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My email address is really [EMAIL PROTECTED]
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