Internet-Draft Ryan Moats draft-ietf-urn-ietf-05.txt AT&T Expires in six months May 1998 A URN Namespace for IETF Documents Filename: draft-ietf-urn-ietf-05.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. Expires 11/30/98 [Page 1] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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. 0.3 Changes from -04 More clarifications for the persistence section. In addition, cleaned up some typos and ensured that the Appendix examples are functional 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 Expires 11/30/98 [Page 2] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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 document 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 includes the sequence number of the IETF conference. Identifier persistence considerations: Persistence of the URNs of this namespace is independent of the mutability of the underlying documents. A URN once assigned will never be reassigned to a different resource; the assignment is persistent and immutable. Distinct from this, the resources identified as RFCs are immutable, whereas the other sorts of documents, STDs, FYIs, and BCPs are not. They may be composites of one or more RFCs and the set of RFCs that comprise them may change with time. It is important to note that this mutability of some resources is independent of the immutability of URN assignment to a resource. Process of identifier assignment: Assignment of URNs from this namespace occurs 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. Expires 11/30/98 [Page 3] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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: 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. Expires 11/30/98 [Page 4] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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," RFC 2234, November 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; # # 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", Expires 11/30/98 [Page 5] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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 "Status: 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 "Status: 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; } &urn_error("404 Not Found\n"); } sub end { my($inarg)=@_; return $inarg . "st" if ($inarg =~ /1$/); return $inarg . "nd" if ($inarg =~ /2$/); Expires 11/30/98 [Page 6] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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 "Status: 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; } } print "\nCitation for $urn\n"; Expires 11/30/98 [Page 7] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 print "\n"; $link=&make_link("$scheme$value"); print "

$scheme$value:

\n"; foreach $i (@bib) { print "$i\n"; } print "\n\n"; } else { print "Status: 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]*)/); Expires 11/30/98 [Page 8] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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 "Status: $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($wgpath) = "/ftp/ietf"; Expires 11/30/98 [Page 9] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 my($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 "Status: 302 Moved temporarily\n"; print "Location: $link\n"; return; } my($link)="$wgpath/$date/$sesnam-minutes-$date.txt"; if (-f $link) { print "Status: 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 $pstry) { print "Status: 302 Moved temporarily\n"; print "Location: http://$host/$pathbase{$scheme}$value.ps\n\n"; Expires 11/30/98 [Page 10] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 last MIME_SWITCH; } if ($accept =~ /text\/html/ && -f $htmltry) { print "Status: 302 Moved temporarily\n"; print "Location: http://$host/$pathbase{$scheme}$value.html\n\n"; last MIME_SWITCH; } if ($accept =~ /\*\/\*|text\/plain/ && -f $txttry) { print "Status: 302 Moved temporarily\n"; print "Location: http://$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 "Status: $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" ); Expires 11/30/98 [Page 11] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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) { $link=~s/^\/ftp\///; my($ftplink)="ftp://$host/$link"; my($httplink)="http://$host/$link"; my($glink)="gopher://$host:70/0/$link"; if ($accept =~ /text\/uri-list/) { #look for text/uri-list, otherwise text/html print "Status: 200 OK\n"; print "Content-type: text/uri-list\n\n\n"; print "#$urn\n"; print "$ftplink\n"; print "$httplink\n"; print "$glink\n"; } if ($accept =~ /\*\/\*|text\/html/) { print "Status: 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 "$ftplink\n"; print "$httplink\n"; Expires 11/30/98 [Page 12] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 print "$glink\n"; print "
\n\n\n"; } return; } my($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 ($accept =~ /text\/uri-list/) { #look for text/uri-list, otherwise text/html print "Status: 200 OK\n"; print "Content-type: text/uri-list\n\n\n"; print "#$urn\n"; print "$ftplink\n"; print "$httplink\n"; print "$glink\n"; } if ($accept =~ /\*\/\*|text\/html/) { print "Status: 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; } &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"); } Expires 11/30/98 [Page 13] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 $try="/ftp/$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 ($accept =~ /text\/uri-list/) { #look for text/uri-list, otherwise text/html print "Status: 200 OK\n"; print "Content-type: text/uri-list\n\n\n"; print "#$urn\n"; foreach $i (@urls) { print "$i\n"; } last MIME_SWITCH; } if ($accept =~ /\*\/\*|text\/html/) { print "Status: 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 "
  • $i\n"; } print "
\n\n\n"; last MIME_SWITCH; } } } sub urn_error { my($code) = @_; #store failure code here... print "Status: $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"; Expires 11/30/98 [Page 14] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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 (&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"; Expires 11/30/98 [Page 15] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 if (-f $link) { if ($accept =~ /text\/uri-list/) { print "Status: 200 OK\n"; print "Content-type: text/uri-list\n\n\n"; print "#$urn\n"; return; } if ($accept =~ /\*\/\*|text\/html/) { print "Status: 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 "Status: 200 OK\n"; print "Content-type: text/uri-list\n\n\n"; print "#$urn\n"; return; } if ($accept =~ /\*\/\*|text\/html/) { print "Status: 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$/); return $inarg . "th"; } Expires 11/30/98 [Page 16] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 sub resolve1 { my($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 "Status: 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 "Status: 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"; Expires 11/30/98 [Page 17] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 foreach $i (@ref) { print "
  • $i: Click to resolve using\n"; print "I2C,\n"; print "I2L,\n"; print "I2Ls,\n"; print "I2R,\n"; print "I2Rs\n"; } print "
\n\n\n"; } } } sub make_link { my($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 "Status: $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", Expires 11/30/98 [Page 18] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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) = @_; &urn_error("404 Not Found\n") if (!defined $number2date{$ietfnum}); my($date)=$number2date{$ietfnum}; my($link)="$wgpath/$sesnam/$sesnam-minutes-$date.txt"; if (-f $link) { print "Status: 200 OK\n"; print "Content-type: text/plain\n\n"; open(FILE, "$link"); while () { print $_; } close FILE; return; } my($link)="$wgpath/$date/$sesnam-minutes-$date.txt"; if (-f $link) { print "Status: 200 OK\n"; print "Content-type: text/plain\n\n"; open(FILE, "$link"); while () { print $_; } Expires 11/30/98 [Page 19] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 close FILE; return; } &urn_error("404 Not Found\n"); } sub end { my($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 $pstry) { print "Status: 200 OK\n"; print "Content-type: application/postscript\n\n"; open(FILE, "$pstry"); while () { print $_; } close FILE; last MIME_SWITCH; } if ($accept =~ /text\/html/ && -f $htmltry) { print "Status: 200 OK\n"; print "Content-type: text/html\n\n"; open(FILE, "$htmltry"); while () { print $_; } close FILE; last MIME_SWITCH; } if ($accept =~ /\*\/\*|text\/plain/ && -f $txttry) { print "Status: 200 OK\n"; print "Content-type: text/plain\n\n"; open(FILE, "$txttry"); Expires 11/30/98 [Page 20] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 while () { print $_; } close FILE; last MIME_SWITCH; } &urn_error("404 Not Found\n"); } } sub urn_error { my($code) = @_; #store failure code here... print "Status: $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"; 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", Expires 11/30/98 [Page 21] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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 "Status: 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 "$_"; } close FILE; Expires 11/30/98 [Page 22] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 } print "--endpart\n"; } sub resolve1 { my($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 "Status: 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 "$_"; } close FILE; } print "--endpart\n"; } sub urn_error { my($code) = @_; #store failure code here... print "Status: $code"; Expires 11/30/98 [Page 23] INTERNET DRAFT A URN Namespace for IETF Documents May 1998 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 11/30/98 [Page 24]