World: r3wp

k: enbase checksum/secure to-string now/precise
k': enbase checksum/secure to-string now/precise
Give same return !!!
better include wait .1 between !

A useful warning not to use current time as a unique key :-)


A wait of .001 is sufficient to get me different times -- but that 
may be processor and operating system dependent.

This code may help in exploring your limits:

n: 0
forever [
   n: n + 1
   k: enbase checksum/secure to-string now/precise
   wait .001
   k': enbase checksum/secure to-string now/precise
   if k = k' [print n halt]
]

better hint fo a unique key ? (meet rebol a week ago)

Never use current time as key generator. Win98 uses about 0.01 second 
timer resolution, which slapped me in the face a few years ago. Other 
OS'es may be similar.

elenay, should be enough to apply random to the binary.

true, clever, but we never knows. don't you ? I do :-)

As Henrik says, this code _probably_ returns unique ids:
n: 0
forever [
   n: n + 1
   k:  random/secure enbase checksum/secure to-string now/precise
   k': random/secure enbase checksum/secure to-string now/precise
   if k = k' [print n halt]
]


But for best results, add in something more:
-- a count?
-- user name / IP address?

a count would be useful

join the previous k

n reach 2 000 000, did not halt by itself. 

I take it like this, with mentions for responsability should be directed 
to you Sunanda ;-)
Thanks

That leaves you three basic options:)

That leaves you three basic options:)

(opps -- my enter key got reset somehow)
1. hire me at a reasonable rate as your official scapegoat

2. make yourself potentially a billion times safer (so no need for 
a scapegoat) by adding something to the checksum string -- eg:

    k:  rejoin [random/secure enbase checksum/secure to-string now/precise 
    random/secure 100'000'000]
3. read up on UUID / GUID generation, eg:
    http://www.rebol.org/ml-display-thread.r?m=rmlCYYK

sunanda, for your timing issue in generating unique keys, use my 
precise time module it NEVER returns the same time twice, the counter 
is CPu based.

i usually use a random string generated on app startup, the time 
and a random value at each call.  

purists will tell you not to use the system time for the random seed 
.  it creates a time frame of attack which vastly reduces the number 
of hits required for brute force attacks.  


use two independent system data values like disk free size, & a measured 
I/O divided by each other.   a single digit off generates a completely 
different seed, so its much better and cannot be guestimaged easily 
by the attacker.

I just ask the user to think of a number

This is what I often use:

>> random/seed now
>> enbase checksum/secure random mold system/error     
== "EZHHHYzUpj78+Eab+Y8vygt75ZA="

Of course, if you are running on a real operating system, you can 
get better "randomness" using:

>> p: open/binary/direct %/dev/urandom
>> enbase copy/part p 16
== "2Fm5zVhMBCgQkdQ3afEpYw=="
>> enbase copy/part p 32
== "Ymk3t6HyAgKNzpALcvGSXyV6poSDwRzk5pCR7IoDz68="
>> close p

I'm a newbie to Rebol. I need to know how to delete a file on my 
website. I tried uploading a file using:

write ftp://user:[pass-:-website-:-com]/myfile.enc myfile.enc


which does not work because of the ['-:-'] in the user name. I tried 
replacing the ['-:-'] with '%40', still did not work. So I tried the 
following which works:

ftp-port: [
	scheme: 'ftp
	host: "ftp.mysite.org"
	port-id: 21
	user: "[user-:-mysite-:-org]"
	pass: "xxxxxxxxxxxxx"
	target: %myfile.enc
]
file: read %myfile.enc
write/binary ftp-port file


So now my file is on my server. My question is - How do I delete 
this file? I see no way to tell the Delete command the name of the 
file on my server so it can delete it. And:

delete ftp://user:[pass-:-website-:-com]/myfile.enc


does not work for the same reason the standard velsion of write does 
not work, because of the ['-:-'] in the user name. Any help much appreciated.

delete [
	scheme: 'ftp
	host: "ftp.mysite.org"
	port-id: 21
	user: "[user-:-mysite-:-org]"
	pass: "xxxxxxxxxxxxx"
	target: %myfile.enc
]

does that work?

No, delete does not take a file spec

I just found that out.

Try this http://rebol.wik.is/Protocols/Ftp

See the file attached at the bottom

do %prot-ftp.r

then, do this

delete ftp://user%2540mysite.org:[pass-:-ftp-:-mysite-:-org]/myfile.enc

Hold the guimauve

I had to type that all out very slowly and carefully, long password, 
and I don't use the shell much these days (I'm an old Amigan). YES 
it worked! Thanks Graham. I'll add the guimauve, they do look delicious. 
Help me out much more and end up delivering a feast.


So I imagine I need to include prot-ftp.r in my Rebol programs and 
I'll be able to use the standard way of accessing files on my server? 
Am I right?

Thanks for all the help, this will get me going now.

I had an Amiga 1000 bought in 1985 ... always used the shell there 
:)

Yep, those were the days :) My Amiga 4000 finally died in 2002. That's 
when I switched to linux. No more Amiga :(

You can try this .... instead of loading up the ftp protocol, 


 system/schemes/ftp/handler/open-check: [none ["220" "230"] ["USER" 
 dehex port/user] "331" ["PASS" port/pass] "230" "SYST" "*"]

ie. patch the scheme in memory

Patch the scheme in memory, OK I'll give that a go. I'm on a steep 
learning curve here.

In REBOL, all code is just data ...

But I'm getting the idea.

'All code is just data'. That's what I like about Rebol.

system/schemes/ftp/handler/open-ftp - Is that on windows? I don't 
have anything like that here on linux.

Just found it. It's in /home/user/Rebol/source.

eh??

system is a REBOL object

it's open-check .. not open-ftp

? system/schemes/ftp/handler

will show you what resides inside the handler

Sorry, my typing error. I found open-check in /home/user/Rebol/source/prot-ftp.r 
and changed it to your code above, and it works! I have Rebol in 
my home folder, not in any of the linux (Ubuntu) system folders.

prot-ftp.r is a file in my home folder. I hope that makes sense. 
Anyway, your code works :)

I have the sdk!

With a license.

sure .. you can patch it so that you just encap it later on

Sadly, I have yet to get encap to work on linux (Ubuntu). I'll figure 
that one out later. For now my goal is to just get everything working. 
I'll not be passing out programs for others to use for another few 
months. That's when I'll need encap.

Hopefully you have a Linux SDK license?

I do, and a windows one.

You can tell I'm serious about switching to Rebol.

yes, that's always good :-)

http://www.rebol.net/cgi-bin/rambo.r?id=-4777&

Delete does not take a port spec

( Gabriele are you still reviewing Rambo submissions? )