Internet-Draft Ryan Moats draft-ietf-urn-ietf-04.txt AT&T Expires in six months April 1998 pl 10.0i A URN Namespace for IETF Documents Filename: draft-ietf-urn-ietf-04.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 distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet- Drafts as reference material or to cite them other than as ``work in progress.'' To view the entire list of current Internet-Drafts, please check the "1id-abstracts.txt" listing contained in the Internet-Drafts Shadow Directories on ftp.is.co.za (Africa), ftp.nordu.net (Northern Europe), ftp.nis.garr.it (Southern Europe), munnari.oz.au (Pacific Rim), ftp.ietf.org (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, FYIs, and BCPs) 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. 0.1 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. 0.2 Changes from -03 Text was added to the template clarifying persistence and uniqueness. Support for the BCP document series added to the examples and the ABNF. Expires 10/31/98 [Page 1] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 1. Introduction This document proposes the "ietf" namespace, which consists of the RFC family of documents (RFCs, STDs, FYIs, and BCPs) 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" / "bcp" 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 number uniquely these URNs are unique. Since the mapping between RFCs and other rfc-editor docuent series (STDs, FYIs or BCPs) is not necessarily one-to-one, uniqueness of STDs, FYIs and BCPs are defined based on the document mappings maintained by the RFC Editor (the index files "rfc-index.txt", "fyi-index.txt", "bcp-index.txt" and "std-index.txt") are defined to be the definitive statement of the assignment of RFC Family URNs in this namespace. The meeting minutes portion of the namespace is guaranteed unique because the URN Expires 10/31/98 [Page 2] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 includes the sequence number of the IETF conference. Identifier persistence considerations: Persistence of the URNs of this namespace is dependent on the persistence of the underlying documents. The fundamental difference between RFCs on one hand and STDs, FYIs, or BCPs on the other is that only RFCs are real, even persistent, documents while the others are just names for sets of one or more RFCs which may change over time. Process of identifier assignment: Assignment of URNs from this namespace occur in two ways. The first is when a new RFC, FYI, STD or BCP 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", "bcp-index.txt" and "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. Expires 10/31/98 [Page 3] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 Scope: 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 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 #!/usr/local/bin/perl use strict; Expires 10/31/98 [Page 4] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 # # 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", bcp => "/ftp/rfc/bcp-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 "\nCitation for $urn\n"; print "\n"; print "

$urn:

\n"; print "Minutes of the $sesnam working group from the " . &end($ietfnum) . " IETF"; print "\n\n"; return; } 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 "\nCitation for $urn\n"; print "\n"; print "

$urn:

\n"; print "Minutes of the $sesnam working group from the " . &end($ietfnum) . " IETF"; print "\n\n"; Expires 10/31/98 [Page 5] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 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 () { $flag = 1 if (/^0*$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"; $bib[0] =~ s/^[0-9]*\s*//; for ($i=0; $i<=$#bib; $i+=1) { last if ($bib[$i] =~ s/\./.<\/B>/); } for ($i=0;$i<=$#bib;$i+=1) { $k=$bib[$i]; while ($k =~ /(fyi|std|rfc|bcp)([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/$j/$j<\/A>/g; Expires 10/31/98 [Page 6] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 } } print "\nCitation for $urn\n"; print "\n"; $link=&make_link("$scheme$value"); print "

$scheme$value:

\n"; foreach $i (@bib) { print "$i\n"; } print "\n\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/, "/, "/); $j += ($bib[$i] =~ s/",/"<\/B>,/); } for ($i=0;$i<=$#bib;$i+=1) { $k=$bib[$i]; while ($k =~ /(fyi\s|std\s|rfc|bcp)([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"); $bib[$i] =~ s/$j/$j<\/A>/g; } } print "\nCitation for $urn\n"; print "\n"; $link=&make_link("$scheme$value"); print "

$scheme$value:

\n"; foreach $i (@bib) { print "$i\n"; } print "\n\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"; Expires 10/31/98 [Page 7] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 } sub urn_error { my($code) = @_; #store failure code here... print "HTTP/1.0 $code"; print "Content-type: text/html\n\n\n"; print "URN Resolution: I2C $code\n"; print "\n"; print "

URN to URC resolution failed for the URN:

\n"; print "

$urn

\n"; print "\n"; print "\n"; exit; }; A.2 I2L #!/usr/local/bin/perl use strict; # # this is a URN 2 URL resolver for the ietf namespace # my(%pathbase) = ( rfc => "rfc/rfc", fyi => "fyi/fyi", std => "std/std", bcp => "bcp/bcp", ); 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 { Expires 10/31/98 [Page 8] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 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$/); 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}$value.txt\n\n"; last MIME_SWITCH; } &urn_error("404 Not Found\n"); } } Expires 10/31/98 [Page 9] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 sub urn_error { my($code) = @_; #store failure code here... print "HTTP/1.0 $code"; print "Content-type: text/html\n\n\n"; print "URN Resolution: I2L $code\n"; print "\n"; print "

URN to URL resolution failed for the URN:

\n"; print "

$urn

\n"; print "\n"; print "\n"; exit; } A.3 I2Ls #!/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", bcp => "bcp/bcp" ); 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"); Expires 10/31/98 [Page 10] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 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 ($accept =~ /text\/uri-list/) { #look for text/uri-list, otherwise text/html print "HTTP/1.0 200 OK\n"; print "Content-type: text/uri-list\n\n\n"; print "#$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\n"; print "URN Resolution: I2Ls\n"; print "\n"; print "

URN $urn resolves to the following URLs:

\n"; print "
\n\n\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\n"; print "URN Resolution: I2Ls\n"; print "\n"; print "

URN $urn resolves to the following URLs:

\n"; print "
    \n"; print "$ftplink\n"; Expires 10/31/98 [Page 11] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 print "$httplink\n"; print "$glink\n"; print "
\n\n\n"; } return; } &urn_error("404 Not Found\n"); } sub resolve1 { my($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\n"; print "URN Resolution: I2Ls\n"; print "\n"; print "

URN $urn resolves to the following URLs:

\n"; print "
    \n"; foreach $i (@urls) { print "
  • $i\n"; Expires 10/31/98 [Page 12] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 } print "
\n\n\n"; last MIME_SWITCH; } } } sub urn_error { my($code) = @_; #store failure code here... print "HTTP/1.0 $code"; print "Content-type: text/html\n\n\n"; print "URN Resolution: I2Ls $code\n"; print "\n"; print "

URN to URL resolution failed for the URN:

\n"; print "

$urn

\n"; print "\n"; print "\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", bcp => "/ftp/rfc/bcp-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 Expires 10/31/98 [Page 13] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 (&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\n"; print "URN Resolution: I2Ns\n"; print "\n"; print "

URN $urn resolves to the following URNs:

\n"; print "
    \n"; print "
\n\n\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\n"; print "URN Resolution: I2Ns\n"; print "\n"; print "

URN $urn resolves to the following URNs:

\n"; print "
    \n"; print "
\n\n\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$/); Expires 10/31/98 [Page 14] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 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 () { $flag = 1 if (/^0*$value /); if ($flag == 1) { last if (/^$/); chop; push @bib,$_; } } $k=join " ",@bib; while ($k =~ /(\S*)\s*(fyi|std|rfc|bcp)\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/; $b =~ s/^0*//; push @ref,"urn:ietf:$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 $i (@ref) { print "$i\n"; } last MIME_SWITCH; } if ($accept =~ /\*\/\*|text\/html/) { print "HTTP/1.0 200 OK\n"; print "Content-type: text/html\n\n\n"; print "URN Resolution: I2Ns\n"; print "\n"; print "

URN $urn resolves to the following URNs:

\n"; print "
    \n"; foreach $i (@ref) { print "
  • $i: Click to resolve using\n"; print "I2C,\n"; Expires 10/31/98 [Page 15] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 print "I2L,\n"; print "I2Ls,\n"; print "I2R,\n"; print "I2Rs\n"; } print "
\n\n\n"; } } } sub make_link { my($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\n"; print "URN Resolution: I2Ns $code\n"; print "\n"; print "

URN to URC resolution failed for the URN:

\n"; print "

$urn

\n"; print "\n"; print "\n"; exit; }; A.5 I2R #!/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", bcp => "bcp/bcp" ); my(%number2date) = ( 41 => "98apr", 40 => "97dec", 39 => "97aug", 38 => "97apr", 37 => "96dec", 36 => "96jun", 35 => "96mar", Expires 10/31/98 [Page 16] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 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 () { print $_; } close FILE; return; } my($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 () { 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 $inarg . "th"; } sub resolve1 { Expires 10/31/98 [Page 17] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 my($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 () { 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 () { print $_; } close FILE; last MIME_SWITCH; } if ($accept =~ /\*\/\*|text\/plain/ && -f $txttry) { print "HTTP/1.0 200 OK\n"; print "Content-type: text/plain\n\n"; open(FILE, "$txttry"); while () { 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\n"; print "URN Resolution: I2R $code\n"; print "\n"; print "

URN to URL resolution failed for the URN:

\n"; print "

$urn

\n"; print "\n"; print "\n"; Expires 10/31/98 [Page 18] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 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", bcp => "bcp/bcp" ); 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, $sesnam) = @_; my(@vers,$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); Expires 10/31/98 [Page 19] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 } &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$/) { print "Content-Type: application/postscript\n\n"; } open(FILE, "$i"); while () { 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$/) { Expires 10/31/98 [Page 20] INTERNET DRAFT A URN Namespace for IETF Documents April 1998 print "Content-Type: application/postscript\n\n"; } open(FILE, "$i"); while () { print "$_"; } close FILE; } print "--endpart\n"; } sub urn_error { my($code) = @_; #store failure code here... print "HTTP/1.0 $code"; print "Content-type: text/html\n\n\n"; print "URN Resolution: I2Rs $code\n"; print "\n"; print "

URN to URL resolution failed for the URN:

\n"; print "

$urn

\n"; print "\n"; print "\n"; exit; } Expires 10/31/98 [Page 21]