Internet-Draft Ryan Moats
draft-ietf-urn-ietf-03.txt AT&T
Expires in six months September 1997
A URN Namespace for IETF Documents
Filename: draft-ietf-urn-ietf-03.txt
Status of This Memo
This document is an Internet-Draft. Internet-Drafts are working
documents of the Internet Engineering Task Force (IETF), its
areas, and its working groups. Note that other groups may also
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(Europe), munnari.oz.au (Pacific Rim), ds.internic.net (US East
Coast), or ftp.isi.edu (US West Coast).
Abstract
A system for Uniform Resource Names (URNs) must be capable of
supporting new naming systems. As an example of proposing a new
namespace, this document proposes the ''ietf'' namespace. This
namespace consists of the RFC family of documents (RFCs, STDs, and
FYIs) developed by the IETF and published by the RFC editor and the
minutes of working groups (WG) and birds of a feather (BOF) meetings
that occur during IETF conferences. Both the current URN framework
and URN syntax support this namespace.
0. Changes from -02
This document has been restructured to use the template proposed in
draft-ietf-urn-nid-req-03.txt. Example Perl scripts for resolving
this namespace have been supplied in an Appendix.
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1. Introduction
This document proposes the "ietf" namespace, which consists of the
RFC family of documents (RFCs, STDs, and FYIs) developed by the IETF
and published by the RFC editor and the minutes of working groups
(WG) and birds of a feather (BOF) meetings that occur during IETF
conferences.
The namespace specification is for a formal namespace.
2. Specification Template
Namespace ID:
"ietf" requested.
Declared registrant of the namespace:
Ryan Moats
jayhawk@att.com
Declaration of structure:
The identifier has the following ABNF [2] specification:
NSS = (family ":" number) / ("mtg-" number "-" wgbofname)
family = "rfc" / "std" / "fyi"
number = 1*DIGIT
wgbofname = 1*LETDIGIT
LETDIGIT = DIGIT / %x41..%x5a / %x61..%x7a
DIGIT = %x30..%x39
If the IESG (or it successor) adds a new document
series, this ABNF specification will need to be
updated. Further, If a working group or BOF is
created that used characters outside the range of this
ABNF specification, this specification will need to be
updated. Any system intended to resolve names for
this namespace should be written with the awareness
that this could occur at any time.
Identifier uniqueness considerations:
Because the rfc-editor assigns the RFC, FYI and STD
number uniquely these URNs are unique. The meeting
minutes portion of the namespace is guaranteed unique
because the URN includes the sequence number of the
IETF conference
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Identifier persistence considerations:
Persistence of the URNs of this namespace is dependent
on the persistence of the underlying documents.
Process of identifier assignment:
Assignment of URNs from this namespace occur in two
ways. The first is when a new RFC, FYI or STD is
passed by the IESG and published by the RFC
Editor. This new document will have a new series
number and will therefore define a new URN. The
document mappings maintained by the RFC Editor (the
index files "rfc-index.txt", "fyi-index.txt",
"std-index.txt") are defined to be the definitive
statement of the assignment of RFC Family URNs in this
namespace.
The second way a URN is assigned is when a working
group or birds of a feather files meeting minutes as
part of an IETF conference. The list of minutes
maintained by the IETF for each working group and
conference in the subtree pointed at by the URL
ftp://ietf.org/ietf/ is considered the definitive
assignment of URNs for working group or birds of a
feather minutes.
Process of identifier resolution:
A mirrored copy of the underlying documentation is
required to resolve these URNs. Resolution via
HTTP is accomplished by a set of simple Perl cgi-bin
scripts presented in Appendix A.
Rules for Lexical Equivalence:
The entire URN is case-insensitive.
Conformance with URN Syntax:
There are no additional characters reserved.
Validation mechanism:
None specified.
Scope:
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Global.
3. Security Considerations
Because this namespace defines no additional reserved characters, it
does not add any security considerations beyond those inherent from
the existence of the reserved characters from [1]. Further, none of
the reserved characters from [1] are used in the definition of the
NSS. This means that resolvers for this namespace may be considered
"secure" in the sense that any escaping of characters in the NSS MUST
result in the resolver indicating that the URN has incorrect syntax.
4. Acknowledgments
Thanks to various members of the URN working group for comments on
earlier drafts of this document. The work described in this document
is partially supported by the National Science Foundation,
Cooperative Agreement NCR-9218179.
4. References
Request For Comments (RFC) and Internet Draft documents are available
from <URL:ftp://ftp.internic.net> and numerous mirror sites.
[1] R. Moats, "URN Syntax," RFC 2141, May 5, 1997.
[2] D. Crocker, P. Overell, "Augmented BNF for Syntax Specifica-
tions: ABNF," Internet Draft (work in progress), January
1997.
5. Author's Address
Ryan Moats
AT&T
15621 Drexel Circle
Omaha, NE 68135-2358
USA
Phone: +1 402 894-9456
EMail: jayhawk@att.com
Appendix A. Example Resolution Scripts
The following scripts are examples that can be used for resolving
URNs in this namespace.
A.1 I2C
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#!/usr/local/bin/perl
use strict;
#
# this is a URN 2 URC resolver for the ietf namespace
#
my(%cite) = (
rfc => "/ftp/rfc/rfc-index.txt",
fyi => "/ftp/fyi/fyi-index.txt",
std => "/ftp/std/std-index.txt"
);
my(%number2date) = (
41 => "98apr",
40 => "97dec", 39 => "97aug", 38 => "97apr",
37 => "96dec", 36 => "96jun", 35 => "96mar",
34 => "95dec", 33 => "95jul", 32 => "95apr",
31 => "94dec", 30 => "94jul", 29 => "94mar",
28 => "93nov", 27 => "93jul", 26 => "93mar",
25 => "92nov", 24 => "92jul", 23 => "92mar",
22 => "91nov", 21 => "91jul", 20 => "91mar",
19 => "90dec" );
my($wgpath) = "/ftp/ietf";
my($urn) = $ENV{'QUERY_STRING'};
my($host) = $ENV{'SERVER_NAME'}; #get my host name for ftp: URLs
my($accept) = $ENV{'HTTP_ACCEPT'}; #this is the "Accept:" HTTP header
(&resolve1($1, $2), exit) if ($urn =~ /urn:ietf:(\w*):(\d*)/i);
(&resolve2($1, $2), exit) if ($urn =~ /urn:ietf:mtg-(\d*)-(\w*)/i);
&urn_error("400 Bad Request\n");
sub resolve2 {
my($ietfnum, $sesnam) = @_;
&urn_error("404 Not Found\n") if (!defined $number2date{$ietfnum});
my($date)=$number2date{$ietfnum};
my($link)="$wgpath/$sesnam/$sesnam-minutes-$date.txt";
if (-f $link) {
print "HTTP/1.0 200 OK\r\n";
print "Content-type: text/html\r\n\r\n";
print "<HTML>\n<TITLE>Citation for $urn</TITLE>\n";
print "<BODY>\n";
print "<H1><A HREF=\"$link\">$urn</A>:</H1>\n";
print "Minutes of the $sesnam working group from the " . &end($ietfnum) . " IETF";
print "</BODY>\n</HTML>\n";
return;
}
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my($link)="$wgpath/$date/$sesnam-minutes-$date.txt";
if (-f $link) {
print "HTTP/1.0 200 OK\r\n";
print "Content-type: text/html\r\n\r\n";
print "<HTML>\n<TITLE>Citation for $urn</TITLE>\n";
print "<BODY>\n";
print "<H1><A HREF=\"$link\">$urn</A>:</H1>\n";
print "Minutes of the $sesnam working group from the " . &end($ietfnum) . " IETF";
print "</BODY>\n</HTML>\n";
return;
}
&urn_error("404 Not Found\n");
}
sub end {
my($inarg)=@_;
return $inarg . "st" if ($inarg =~ /1$/);
return $inarg . "nd" if ($inarg =~ /2$/);
return $inarg . "rd" if ($inarg =~ /3$/);
return $inarg . "th";
}
sub resolve1 {
my($flag,@bib,$i,$k,$j,$done,@ref);
my($l,$link);
my($scheme, $value) = @_;
$scheme =~ tr/A-Z/a-z/;
if (!defined $cite{$scheme}) {
&urn_error("404 Not Found\n");
}
$flag = 0;
open(INPUT, "$cite{$scheme}");
while (<INPUT>) {
$flag = 1 if (/^0*$value /);
if ($flag == 1) {
last if (/^$/);
chop;
push @bib,$_;
}
}
if ($scheme ne "rfc") {
print "HTTP/1.0 200 OK\r\n";
print "Content-type: text/html\r\n\r\n";
$bib[0] =~ s/^[0-9]*\s*/<B>/;
for ($i=0; $i<=$#bib; $i+=1) {
last if ($bib[$i] =~ s/\./.<\/B>/);
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}
for ($i=0;$i<=$#bib;$i+=1) {
$k=$bib[$i];
while ($k =~ /(fyi|std|rfc)([0-9]+)(.*)/i) {
push @ref,"$1$2";
$k=$3;
}
$done="";
foreach $j (@ref) {
next if ($done =~ $j);
$done .= "$j ";
$l = $j;
$l =~ tr/A-Z/a-z/;
$link=&make_link("$l");
$bib[$i] =~ s/$j/<A HREF="$link">$j<\/A>/g;
}
}
print "<HTML>\n<TITLE>Citation for $urn</TITLE>\n";
print "<BODY>\n";
$link=&make_link("$scheme$value");
print "<H1><A HREF=\"$link\">$scheme$value</A>:</H1>\n";
foreach $i (@bib) {
print "$i\n";
}
print "</BODY>\n</HTML>\n";
} else {
print "HTTP/1.0 200 OK\r\n";
print "Content-type: text/html\r\n\r\n";
$bib[0] =~ s/^[0-9]*\s*//;
$j=0;
for ($i=0; $i<=$#bib; $i+=1) {
$j += ($bib[$i] =~ s/, "/, <B>"/);
$j += ($bib[$i] =~ s/",/"<\/B>,/);
}
for ($i=0;$i<=$#bib;$i+=1) {
$k=$bib[$i];
while ($k =~ /(fyi\s|std\s|rfc)([0-9]+)(.*)/i) {
push @ref,"$1$2";
$k=$3;
}
$done="";
foreach $j (@ref) {
next if ($done =~ $j);
$done .= "$j ";
$l = $j;
$l =~ s/\s//g;
$l =~ tr/A-Z/a-z/;
$link=&make_link("$l");
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$bib[$i] =~ s/$j/<A HREF="$link">$j<\/A>/g;
}
}
print "<HTML>\n<TITLE>Citation for $urn</TITLE>\n";
print "<BODY>\n";
$link=&make_link("$scheme$value");
print "<H1><A HREF=\"$link\">$scheme$value</A>:</H1>\n";
foreach $i (@bib) {
print "$i\n";
}
print "</BODY>\n</HTML>\n";
}
}
sub make_link {
my($sc);
my($inarg)=@_;
($sc=$1) if ($inarg =~ /([a-z]*)/);
return "/$sc/$inarg.ps" if (-e "/ftp/$sc/$inarg.ps");
return "/$sc/$inarg.html" if (-e "/ftp/$sc/$inarg.html");
return "/$sc/$inarg.txt";
}
sub urn_error {
my($code) = @_; #store failure code here...
print "HTTP/1.0 $code";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2C $code</title></head>\n";
print "<BODY>\n";
print "<h1>URN to URC resolution failed for the URN:</h1>\n";
print "<hr><h3>$urn</h3>\n";
print "</body>\n";
print "</html>\n";
exit;
};
A.2 I2L
#!/usr/local/bin/perl
use strict;
#
# this is a URN 2 URL resolver for the ietf namespace
#
my(%pathbase) = (
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rfc => "rfc/rfc",
fyi => "fyi/fyi",
std => "std/std"
);
my(%number2date) = (
38 => "97apr",
37 => "96dec", 36 => "96jun", 35 => "96mar",
34 => "95dec", 33 => "95jul", 32 => "95apr",
31 => "94dec", 30 => "94jul", 29 => "94mar",
28 => "93nov", 27 => "93jul", 26 => "93mar",
25 => "92nov", 24 => "92jul", 23 => "92mar",
22 => "91nov", 21 => "91jul", 20 => "91mar",
19 => "90dec" );
my($wgpath) = "/ftp/ietf";
my($urn) = $ENV{'QUERY_STRING'};
my($host) = $ENV{'SERVER_NAME'}; #get my host name for ftp: URLs
my($accept) = $ENV{'HTTP_ACCEPT'}; #this is the "Accept:" HTTP header
(&resolve1($1, $2), exit) if ($urn =~ /urn:ietf:(\w*):(\d*)/i);
(&resolve2($1, $2), exit) if ($urn =~ /urn:ietf:mtg-(\d*)-(\w*)/i);
&urn_error("400 Bad Request\n");
sub resolve2 {
my($ietfnum, $sesnam) = @_;
&urn_error("404 Not Found\n") if (!defined $number2date{$ietfnum});
my($date)=$number2date{$ietfnum};
my($link)="$wgpath/$sesnam/$sesnam-minutes-$date.txt";
if (-f $link) {
print "HTTP/1.0 302 Moved temporarily\n";
print "Location: $link\n";
return;
}
my($link)="$wgpath/$date/$sesnam-minutes-$date.txt";
if (-f $link) {
print "HTTP/1.0 302 Moved temporarily\n";
print "Location: $link\n";
return;
}
&urn_error("404 Not Found\n");
}
sub end {
my($inarg)=@_;
return $inarg . "st" if ($inarg =~ /1$/);
return $inarg . "nd" if ($inarg =~ /2$/);
return $inarg . "rd" if ($inarg =~ /3$/);
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return $inarg . "th";
}
sub resolve1 {
my($flag,@bib,$i,$k,$j,$done,@ref);
my($l,$link);
my($scheme, $value) = @_;
$scheme =~ tr/A-Z/a-z/;
&urn_error("404 Not Found\n")if (!defined $pathbase{$scheme});
my($txttry)="/ftp/$pathbase{$scheme}$value.txt";
my($pstry)="/ftp/$pathbase{$scheme}$value.ps";
my($htmltry)="/ftp/$pathbase{$scheme}$value.html";
MIME_SWITCH: {
if ($accept =~ /application\/postscript/ && -f $pstry) {
print "HTTP/1.0 302 Moved temporarily\n";
print "Location: http://$host/$pathbase{$scheme}$value.ps\n\n";
last MIME_SWITCH;
}
if ($accept =~ /text\/html/ && -f $htmltry) {
print "HTTP/1.0 302 Moved temporarily\n";
print "Location: http://$host/$pathbase{$scheme}$value.html\n\n";
last MIME_SWITCH;
}
if ($accept =~ /\*\/\*|text\/plain/ && -f $txttry) {
print "HTTP/1.0 302 Moved temporarily\n";
print "Location: http://$host/$pathbase{$scheme}$value.txt\n\n";
last MIME_SWITCH;
}
&urn_error("404 Not Found\n");
}
}
sub urn_error {
my($code) = @_; #store failure code here...
print "HTTP/1.0 $code";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2L $code</title></head>\n";
print "<BODY>\n";
print "<h1>URN to URL resolution failed for the URN:</h1>\n";
print "<hr><h3>$urn</h3>\n";
print "</body>\n";
print "</html>\n";
exit;
}
A.3 I2Ls
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#!/usr/local/bin/perl
use strict;
#
# this is a URN 2 URLs resolver for the ietf namespace
#
my(@urls);
my(%pathbase) = (
rfc => "rfc/rfc",
fyi => "fyi/fyi",
std => "std/std"
);
my(%number2date) = (
38 => "97apr",
37 => "96dec", 36 => "96jun", 35 => "96mar",
34 => "95dec", 33 => "95jul", 32 => "95apr",
31 => "94dec", 30 => "94jul", 29 => "94mar",
28 => "93nov", 27 => "93jul", 26 => "93mar",
25 => "92nov", 24 => "92jul", 23 => "92mar",
22 => "91nov", 21 => "91jul", 20 => "91mar",
19 => "90dec" );
my($wgpath) = "/ftp/ietf";
my($urn) = $ENV{'QUERY_STRING'};
my($host) = $ENV{'SERVER_NAME'}; #get my host name for ftp: URLs
my($accept) = $ENV{'HTTP_ACCEPT'}; #this is the "Accept:" HTTP header
(&resolve1($1, $2), exit) if ($urn =~ /urn:ietf:(\w*):(\d*)/i);
(&resolve2($1, $2), exit) if ($urn =~ /urn:ietf:mtg-(\d*)-(\w*)/i);
&urn_error("400 Bad Request\n");
sub resolve2 {
my($ietfnum, $sesnam) = @_;
&urn_error("404 Not Found\n") if (!defined $number2date{$ietfnum});
my($date)=$number2date{$ietfnum};
my($link)="$wgpath/$sesnam/$sesnam-minutes-$date.txt";
if (-f $link) {
$link=~s/^\/ftp\///;
my($ftplink)="ftp://$host/$link";
my($httplink)="http://$host/$link";
my($glink)="gopher://$host:70/0/$link";
if ($accept =~ /text\/uri-list/) { #look for text/uri-list, otherwise text/html
print "HTTP/1.0 200 OK\n";
print "Content-type: text/uri-list\n\n\n";
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print "#$urn\n";
print "$ftplink\n";
print "$httplink\n";
print "$glink\n";
}
if ($accept =~ /\*\/\*|text\/html/) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2Ls</title></head>\n";
print "<BODY>\n";
print "<h1>URN $urn resolves to the following URLs:</h1>\n";
print "<hr><ul>\n";
print "<a href=\"$ftplink\">$ftplink</a>\n";
print "<a href=\"$httplink\">$httplink</a>\n";
print "<a href=\"$glink\">$glink</a>\n";
print "</UL>\n</body>\n</HTML>\n";
}
return;
}
my($link)="$wgpath/$date/$sesnam-minutes-$date.txt";
if (-f $link) {
$link=~s/^\/ftp\///;
my($ftplink)="ftp://$host/$link";
my($httplink)="http://$host/$link";
my($glink)="gopher://$host:70/0/$link";
if ($accept =~ /text\/uri-list/) { #look for text/uri-list, otherwise text/html
print "HTTP/1.0 200 OK\n";
print "Content-type: text/uri-list\n\n\n";
print "#$urn\n";
print "$ftplink\n";
print "$httplink\n";
print "$glink\n";
}
if ($accept =~ /\*\/\*|text\/html/) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2Ls</title></head>\n";
print "<BODY>\n";
print "<h1>URN $urn resolves to the following URLs:</h1>\n";
print "<hr><ul>\n";
print "<a href=\"$ftplink\">$ftplink</a>\n";
print "<a href=\"$httplink\">$httplink</a>\n";
print "<a href=\"$glink\">$glink</a>\n";
print "</UL>\n</body>\n</HTML>\n";
}
return;
}
&urn_error("404 Not Found\n");
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}
sub resolve1 {
my($flag,@bib,$i,$k,$j,$done,@ref);
my($l,$link);
my($scheme, $value) = @_;
$scheme =~ tr/A-Z/a-z/;
&urn_error("404 Not Found\n")if (!defined $pathbase{$scheme});
my($try)="/ftp/$pathbase{$scheme}$value.txt";
if (-f $try) {
push(@urls, "http://$host/$pathbase{$scheme}$value.txt");
push(@urls, "ftp://$host/$pathbase{$scheme}$value.txt");
push(@urls, "gopher://$host:70/0/$pathbase{$scheme}$value.txt");
}
$try="/ftp/$pathbase{$scheme}$value.ps";
if (-f $try) {
push(@urls, "http://$host/$pathbase{$scheme}$value.ps");
push(@urls, "ftp://$host/$pathbase{$scheme}$value.ps");
push(@urls, "gopher://$host:70/0/$pathbase{$scheme}$value.ps");
}
$try="/ftp/$pathbase{$scheme}$value.html";
if (-f $try) {
push(@urls, "http://$host/$pathbase{$scheme}$value.html");
push(@urls, "ftp://$host/$pathbase{$scheme}$value.html");
}
&urn_error("404 Not Found\n") if ($#urls == -1);
MIME_SWITCH: {
if ($accept =~ /text\/uri-list/) { #look for text/uri-list, otherwise text/html
print "HTTP/1.0 200 OK\n";
print "Content-type: text/uri-list\n\n\n";
print "#$urn\n";
foreach $i (@urls) {
print "$i\n";
}
last MIME_SWITCH;
}
if ($accept =~ /\*\/\*|text\/html/) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2Ls</title></head>\n";
print "<BODY>\n";
print "<h1>URN $urn resolves to the following URLs:</h1>\n";
print "<hr><ul>\n";
foreach $i (@urls) {
print "<LI><A HREF=\"$i\">$i</A>\n";
}
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print "</UL>\n</body>\n</HTML>\n";
last MIME_SWITCH;
}
}
}
sub urn_error {
my($code) = @_; #store failure code here...
print "HTTP/1.0 $code";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2L $code</title></head>\n";
print "<BODY>\n";
print "<h1>URN to URL resolution failed for the URN:</h1>\n";
print "<hr><h3>$urn</h3>\n";
print "</body>\n";
print "</html>\n";
exit;
}
A.4 I2Ns
#!/usr/local/bin/perl
use strict;
#
# this is a URN 2 URNs resolver for the ietf namespace
#
my(%cite) = (
rfc => "/ftp/rfc/rfc-index.txt",
fyi => "/ftp/fyi/fyi-index.txt",
std => "/ftp/std/std-index.txt"
);
my(%number2date) = (
38 => "97apr",
37 => "96dec", 36 => "96jun", 35 => "96mar",
34 => "95dec", 33 => "95jul", 32 => "95apr",
31 => "94dec", 30 => "94jul", 29 => "94mar",
28 => "93nov", 27 => "93jul", 26 => "93mar",
25 => "92nov", 24 => "92jul", 23 => "92mar",
22 => "91nov", 21 => "91jul", 20 => "91mar",
19 => "90dec" );
my($wgpath) = "/ftp/ietf";
my($urn) = $ENV{'QUERY_STRING'};
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my($host) = $ENV{'SERVER_NAME'}; #get my host name for ftp: URLs
my($accept) = $ENV{'HTTP_ACCEPT'}; #this is the "Accept:" HTTP header
(&resolve1($1, $2), exit) if ($urn =~ /urn:ietf:(\w*):(\d*)/i);
(&resolve2($1, $2), exit) if ($urn =~ /urn:ietf:mtg-(\d*)-(\w*)/i);
&urn_error("400 Bad Request\n");
sub resolve2 {
my($ietfnum, $sesnam) = @_;
&urn_error("404 Not Found\n") if (!defined $number2date{$ietfnum});
my($date)=$number2date{$ietfnum};
my($link)="$wgpath/$sesnam/$sesnam-minutes-$date.txt";
if (-f $link) {
if ($accept =~ /text\/uri-list/) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/uri-list\n\n\n";
print "#$urn\n";
return;
}
if ($accept =~ /\*\/\*|text\/html/) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2Ns</title></head>\n";
print "<BODY>\n";
print "<h1>URN $urn resolves to the following URNs:</h1>\n";
print "<hr><ul>\n";
print "</UL>\n</body>\n</HTML>\n";
return;
}
}
my($link)="$wgpath/$date/$sesnam-minutes-$date.txt";
if (-f $link) {
if ($accept =~ /text\/uri-list/) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/uri-list\n\n\n";
print "#$urn\n";
return;
}
if ($accept =~ /\*\/\*|text\/html/) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2Ns</title></head>\n";
print "<BODY>\n";
print "<h1>URN $urn resolves to the following URNs:</h1>\n";
print "<hr><ul>\n";
print "</UL>\n</body>\n</HTML>\n";
return;
}
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}
&urn_error("404 Not Found\n");
}
sub end {
my($inarg)=@_;
return $inarg . "st" if ($inarg =~ /1$/);
return $inarg . "nd" if ($inarg =~ /2$/);
return $inarg . "rd" if ($inarg =~ /3$/);
return $inarg . "th";
}
sub resolve1 {
my($flag,@bib,$i,$k,$j,$done,@ref);
my($l,$link);
my($scheme, $value) = @_;
$scheme =~ tr/A-Z/a-z/;
if (!defined $cite{$scheme}) {
&urn_error("404 Not Found\n");
}
$flag = 0;
open(INPUT, "$cite{$scheme}");
while (<INPUT>) {
$flag = 1 if (/^0*$value /);
if ($flag == 1) {
last if (/^$/);
chop;
push @bib,$_;
}
}
$k=join " ",@bib;
while ($k =~ /(\S*)\s*(fyi|std|rfc)\s*([0-9]+)(.*)/i) {
$k=$4;
$a=$2; $b=$3;
if (($a ne $scheme || $b ne $value) && ($1 !~ /obso/i)){
$a =~ tr/A-Z/a-z/;
push @ref,"urn:ietf:$a:$b";
}
}
MIME_SWITCH: {
if ($accept =~ /text\/uri-list/) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/uri-list\n\n\n";
print "#$urn\n";
foreach $i (@ref) {
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print "$i\n";
}
last MIME_SWITCH;
}
if ($accept =~ /\*\/\*|text\/html/) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2Ns</title></head>\n";
print "<BODY>\n";
print "<h1>URN $urn resolves to the following URNs:</h1>\n";
print "<hr><ul>\n";
foreach $i (@ref) {
print "<li>$i: Click to resolve using\n";
print "<a href=\"http://dsm0.ds.internic.net:8080/uri-res/I2C?$i\">I2C</a>,\n";
print "<a href=\"http://dsm0.ds.internic.net:8080/uri-res/I2L?$i\">I2L</a>,\n";
print "<a href=\"http://dsm0.ds.internic.net:8080/uri-res/I2Ls?$i\">I2Ls</a>,\n";
print "<a href=\"http://dsm0.ds.internic.net:8080/uri-res/I2R?$i\">I2R</a>,\n";
print "<a href=\"http://dsm0.ds.internic.net:8080/uri-res/I2Rs?$i\">I2Rs</a>\n";
}
print "</UL>\n</body>\n</HTML>\n";
}
}
}
sub make_link {
my($sc);
my($inarg)=@_;
($sc=$1) if ($inarg =~ /([a-z]*)/);
return "/$sc/$inarg.ps" if (-e "/ftp/$sc/$inarg.ps");
return "/$sc/$inarg.html" if (-e "/ftp/$sc/$inarg.html");
return "/$sc/$inarg.txt";
}
sub urn_error {
my($code) = @_; #store failure code here...
print "HTTP/1.0 $code";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2Ns $code</title></head>\n";
print "<BODY>\n";
print "<h1>URN to URC resolution failed for the URN:</h1>\n";
print "<hr><h3>$urn</h3>\n";
print "</body>\n";
print "</html>\n";
exit;
};
A.5 I2R
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#!/usr/local/bin/perl
use strict;
#
# this is a URN 2 resource resolver for the ietf namespace
#
my(%pathbase) = (
rfc => "rfc/rfc",
fyi => "fyi/fyi",
std => "std/std"
);
my(%number2date) = (
38 => "97apr",
37 => "96dec", 36 => "96jun", 35 => "96mar",
34 => "95dec", 33 => "95jul", 32 => "95apr",
31 => "94dec", 30 => "94jul", 29 => "94mar",
28 => "93nov", 27 => "93jul", 26 => "93mar",
25 => "92nov", 24 => "92jul", 23 => "92mar",
22 => "91nov", 21 => "91jul", 20 => "91mar",
19 => "90dec" );
my($wgpath) = "/ftp/ietf";
my($urn) = $ENV{'QUERY_STRING'};
my($host) = $ENV{'SERVER_NAME'}; #get my host name for ftp: URLs
my($accept) = $ENV{'HTTP_ACCEPT'}; #this is the "Accept:" HTTP header
(&resolve1($1, $2), exit) if ($urn =~ /urn:ietf:(\w*):(\d*)/i);
(&resolve2($1, $2), exit) if ($urn =~ /urn:ietf:mtg-(\d*)-(\w*)/i);
&urn_error("400 Bad Request\n");
sub resolve2 {
my($ietfnum, $sesnam) = @_;
&urn_error("404 Not Found\n") if (!defined $number2date{$ietfnum});
my($date)=$number2date{$ietfnum};
my($link)="$wgpath/$sesnam/$sesnam-minutes-$date.txt";
if (-f $link) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/plain\n\n";
open(FILE, "$link");
while (<FILE>) {
print $_;
}
close FILE;
return;
}
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my($link)="$wgpath/$date/$sesnam-minutes-$date.txt";
if (-f $link) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/plain\n\n";
open(FILE, "$link");
while (<FILE>) {
print $_;
}
close FILE;
return;
}
&urn_error("404 Not Found\n");
}
sub end {
my($inarg)=@_;
return $inarg . "st" if ($inarg =~ /1$/);
return $inarg . "nd" if ($inarg =~ /2$/);
return $inarg . "rd" if ($inarg =~ /3$/);
return $inarg . "th";
}
sub resolve1 {
my($flag,@bib,$i,$k,$j,$done,@ref);
my($l,$link);
my($scheme, $value) = @_;
$scheme =~ tr/A-Z/a-z/;
&urn_error("404 Not Found\n")if (!defined $pathbase{$scheme});
my($txttry)="/ftp/$pathbase{$scheme}$value.txt";
my($pstry)="/ftp/$pathbase{$scheme}$value.ps";
my($htmltry)="/ftp/$pathbase{$scheme}$value.html";
MIME_SWITCH: {
if ($accept =~ /application\/postscript/ && -f $pstry) {
print "HTTP/1.0 200 OK\n";
print "Content-type: application/postscript\n\n";
open(FILE, "$pstry");
while (<FILE>) {
print $_;
}
close FILE;
last MIME_SWITCH;
}
if ($accept =~ /text\/html/ && -f $htmltry) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/html\n\n";
open(FILE, "$htmltry");
while (<FILE>) {
print $_;
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}
close FILE;
last MIME_SWITCH;
}
if ($accept =~ /\*\/\*|text\/plain/ && -f $txttry) {
print "HTTP/1.0 200 OK\n";
print "Content-type: text/plain\n\n";
open(FILE, "$txttry");
while (<FILE>) {
print $_;
}
close FILE;
last MIME_SWITCH;
}
&urn_error("404 Not Found\n");
}
}
sub urn_error {
my($code) = @_; #store failure code here...
print "HTTP/1.0 $code";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2L $code</title></head>\n";
print "<BODY>\n";
print "<h1>URN to URL resolution failed for the URN:</h1>\n";
print "<hr><h3>$urn</h3>\n";
print "</body>\n";
print "</html>\n";
exit;
}
A.6 I2Rs
#!/usr/local/bin/perl
use strict;
#
# this is a URN 2 resources resolver for the ietf namespace
#
my(@urls);
my(%pathbase) = (
rfc => "rfc/rfc",
fyi => "fyi/fyi",
std => "std/std"
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);
my(%number2date) = (
38 => "97apr",
37 => "96dec", 36 => "96jun", 35 => "96mar",
34 => "95dec", 33 => "95jul", 32 => "95apr",
31 => "94dec", 30 => "94jul", 29 => "94mar",
28 => "93nov", 27 => "93jul", 26 => "93mar",
25 => "92nov", 24 => "92jul", 23 => "92mar",
22 => "91nov", 21 => "91jul", 20 => "91mar",
19 => "90dec" );
my($wgpath) = "/ftp/ietf";
my($urn) = $ENV{'QUERY_STRING'};
my($host) = $ENV{'SERVER_NAME'}; #get my host name for ftp: URLs
my($accept) = $ENV{'HTTP_ACCEPT'}; #this is the "Accept:" HTTP header
(&resolve1($1, $2), exit) if ($urn =~ /urn:ietf:(\w*):(\d*)/i);
(&resolve2($1, $2), exit) if ($urn =~ /urn:ietf:mtg-(\d*)-(\w*)/i);
&urn_error("400 Bad Request\n");
sub resolve2 {
my($ietfnum, $sesnam) = @_;
my(@vers,$i);
&urn_error("404 Not Found\n") if (!defined $number2date{$ietfnum});
my($date)=$number2date{$ietfnum};
my($link)="$wgpath/$sesnam/$sesnam-minutes-$date.txt";
if (-f $link) {
push(@vers,$link);
}
$link="$wgpath/$date/$sesnam-minutes-$date.txt";
if (-f $link) {
push(@vers,$link);
}
&urn_error("404 Not Found\n") if ($#vers==-1);
print "HTTP/1.0 200 OK\n";
print "Content-type: multipart/alternative; boundary=endpart\n\n";
foreach $i (@vers) {
print "--endpart\n";
if ($i =~ /html$/) {
print "Content-Type: text/html\n\n";
}
if ($i =~ /txt$/) {
print "Content-Type: text/plain\n\n";
}
if ($i =~ /ps$/) {
print "Content-Type: application/postscript\n\n";
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}
open(FILE, "$i");
while (<FILE>) {
print "$_";
}
close FILE;
}
print "--endpart\n";
}
sub resolve1 {
my($flag,@bib,$i,$k,$j,$done,@ref);
my($l,$link,@vers);
my($scheme, $value) = @_;
$scheme =~ tr/A-Z/a-z/;
&urn_error("404 Not Found\n")if (!defined $pathbase{$scheme});
my($try)="/ftp/$pathbase{$scheme}$value.txt";
if (-f $try) {
push(@vers, $try);
}
$try="/ftp/$pathbase{$scheme}$value.ps";
if (-f $try) {
push(@vers, $try);
}
$try="/ftp/$pathbase{$scheme}$value.html";
if (-f $try) {
push(@vers, $try);
}
print "HTTP/1.0 200 OK\n";
print "Content-type: multipart/alternative; boundary=endpart\n\n";
foreach $i (@vers) {
print "--endpart\n";
if ($i =~ /html$/) {
print "Content-Type: text/html\n\n";
}
if ($i =~ /txt$/) {
print "Content-Type: text/plain\n\n";
}
if ($i =~ /ps$/) {
print "Content-Type: application/postscript\n\n";
}
open(FILE, "$i");
while (<FILE>) {
print "$_";
}
close FILE;
}
print "--endpart\n";
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}
sub urn_error {
my($code) = @_; #store failure code here...
print "HTTP/1.0 $code";
print "Content-type: text/html\n\n<HTML>\n";
print "<head><title>URN Resolution: I2L $code</title></head>\n";
print "<BODY>\n";
print "<h1>URN to URL resolution failed for the URN:</h1>\n";
print "<hr><h3>$urn</h3>\n";
print "</body>\n";
print "</html>\n";
exit;
}
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