+++ /dev/null
-#!@PERL_BINARY@
-
-# Copyright (C) 2000, HELM Team.
-#
-# This file is part of HELM, an Hypertextual, Electronic
-# Library of Mathematics, developed at the Computer Science
-# Department, University of Bologna, Italy.
-#
-# HELM is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License, or (at your option) any later version.
-#
-# HELM is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with HELM; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-#
-# For details, see the HELM World-Wide-Web page,
-# http://cs.unibo.it/helm/.
-
-#use strict;
-
-my $VERSION = "@VERSION@";
-
-# various variables
-my ($HELM_LIB_PATH);
-my $cgi_dir = "@HELM_CGI_DIR@";
-my (%xml_map, %rdf_map, %xslt_map);
-
-# First of all, let's load HELM configuration
-use Env;
-my $HELM_LIB_DIR = $ENV{"HELM_LIB_DIR"};
-# this should be the only fixed constant
-my $DEFAULT_HELM_LIB_DIR = "@HELM_LIB_DIR@";
-if (defined ($HELM_LIB_DIR)) {
- $HELM_LIB_PATH = $HELM_LIB_DIR."/configuration.pl";
-} else {
- $HELM_LIB_PATH = $DEFAULT_HELM_LIB_DIR."/configuration.pl";
-}
-
-# next require defines: $helm_dir, $html_link, $dtd_dir, $uris_dbm, $indexname
-require $HELM_LIB_PATH;
-
-# TEMP: TODO put these vars in configuration file configuration.xml
-# <move_to_conf_file>
-my $cachemode = $ENV{'HTTP_GETTER_CACHE_MODE'} ||
- 'gzipped';
-if (($cachemode ne 'gzipped') and ($cachemode ne 'normal')) {
- die "Invalid HTTP_GETTER_CACHE_MODE environment variable, must be".
- "'normal' or 'gzipped'\n";
-}
-
-$helm_rdf_dir = $ENV{'HTTP_GETTER_RDF_DIR'} || $helm_rdf_dir;
-$rdf_dbm = $ENV{'HTTP_GETTER_RDF_DBM'} || $rdf_dbm;
-$xslt_dbm = $ENV{'HTTP_GETTER_XSLT_DBM'} || $xslt_dbm;
-$rdf_indexname = $ENV{'HTTP_GETTER_RDF_INDEXNAME'} || $rdf_indexname;
-$xslt_indexname = $ENV{'HTTP_GETTER_XSLT_INDEXNAME'} || $xslt_indexname;
-$servers_file = $ENV{'HTTP_GETTER_SERVERS_FILE'} || $servers_file;
-$uris_dbm = $ENV{'HTTP_GETTER_URIS_DBM'} || $uris_dbm;
-$dtdbaseurl = $ENV{'HTTP_GETTER_DTD_BASE_URL'} || $dtdbaseurl;
-$getterport = $ENV{'HTTP_GETTER_PORT'} || $getterport;
-
-# </move_to_conf_file>
-
-# Let's override the configuration file
-$style_dir = $ENV{"HELM_STYLE_DIR"} if (defined ($ENV{"HELM_STYLE_DIR"}));
-$dtd_dir = $ENV{"HELM_DTD_DIR"} if (defined ($ENV{"HELM_DTD_DIR"}));
-
-use HTTP::Daemon;
-use HTTP::Status;
-use HTTP::Request;
-use LWP::UserAgent;
-use DB_File;
-use Compress::Zlib;
-use CGI;
-use URI;
-use URI::Escape;
-
-#CSC: mancano i controlli sulle condizioni di errore di molte funzioni
-#CSC: ==> non e' robusto
-#CSC: altra roba da sistemare segnata con CSC
-
-my $d = new HTTP::Daemon LocalPort => $getterport
- or die "Error: port $getterport not available.";
-my $myownurl = $d->url;
-
-# Let's patch the returned URL
-$myownurl =~ s/\/$//; # chop the final slash
-my $myownport = $myownurl;
-$myownport =~ s/http:\/\/(.*):(.*)/$2/;
-$myownurl =~ s/http:\/\/(.*):(.*)/$1/;
-($myownurl) = gethostbyname($myownurl);
-$myownurl = "http://".$myownurl.":".$myownport;
-
-tie(%xml_map, 'DB_File', $uris_dbm, O_RDWR, 0664); # open dbs
-tie(%rdf_map, 'DB_File', $rdf_dbm, O_RDWR, 0664);
-tie(%xslt_map, 'DB_File', $xslt_dbm, O_RDWR, 0664);
-
-print "\n";
-print "HTTP Getter $VERSION\n"; # print hello information
-print "Please contact me at: <URL:", $myownurl."/", ">\n";
-print "\n";
-print "servers_file: $servers_file\n";
-print "helm_dir: $helm_dir\n";
-print "helm_rdf_dir: $helm_rdf_dir\n";
-print "style_dir: $style_dir\n";
-print "dtd_dir: $dtd_dir\n";
-print "urls_of_uris db: $uris_dbm\n";
-print "rdf db: $rdf_dbm\n";
-print "xslt db: $xslt_dbm\n";
-print "cache mode: $cachemode\n";
-print "indexname: $indexname\n";
-print "rdf_indexname: $rdf_indexname\n";
-print "xslt_indexname: $xslt_indexname\n";
-print "dtdbaseurl: $dtdbaseurl\n";
-print "getterport: $getterport\n";
-print "\n";
-
-$SIG{CHLD} = "IGNORE"; # do not accumulate defunct processes
-$SIG{USR1} = \&update; # sent by the child to make the parent update
-
-while (my $c = $d->accept) {
- if (fork() == 0) {
- while (my $r = $c->get_request) {
- #CSC: mancano i controlli di sicurezza
-
- my $http_method = $r->method;
- my $http_path = $r->url->path;
- my $http_query = uri_unescape($r->url->query);
- my $cgi = new CGI("$http_query");
- my $inputuri = $cgi->param('uri');
- print "\nRequest: ".$r->url."\n\n";
-
- print "\nUnescaped query: ".$http_query."\n";
-
- # "getxml" works with rdf uris
- if ($http_method eq 'GET' and $http_path eq "/getxml") {
- # finds the uri, url and filename
-
- my $answerformat = $cgi->param('format');
- my $patch_dtd = $cgi->param('patch_dtd');
- $answerformat = "" if (not defined($answerformat));
- $patch_dtd = "yes" if (not defined($patch_dtd));
- if (($answerformat ne "gz") and ($answerformat ne "normal")
- and ($answerformat ne "")) {
- die "Wrong output format: $answerformat, must be 'normal' ".
- "or 'gz'\n";
- }
- if (($patch_dtd ne "yes") and ($patch_dtd ne "no")
- and ($patch_dtd ne "")) {
- die "Wrong param, patch_dtd must be 'yes' or 'no'\n";
- }
-
- my $filename = $inputuri;
- my $prefix;
- if (not isRdfUri($inputuri)) { # standad cic: or theory: uri
- $filename =~ s/^cic:(.*)/$1/;
- $filename =~ s/^theory:(.*)/$1/;
- } else { # rdf uri
- # The "helm:rdf/<<...>>//cic:" prefix is kept, but quoted
- # (so that a "helm:rdf/<<...>>//cic:" dir is created
- $prefix = $filename;
- $filename =~ s/^(.*)\/\/cic:(.*)/$2/;
- $filename =~ s/^(.*)\/\/theory:(.*)/$2/;
- $prefix =~ s/\Q$filename\E//;
- $prefix =~ s/_/__/g;
- $prefix =~ s/\//_/g;
- $filename = $prefix.$filename;
- }
-
- my $url = resolve ($inputuri); # resolve uri in url
- if (not defined($url)) { # uri not found in uri2url map
- die "NOT FOUND: uri \"$inputuri\" can't be resolved\n";
- $c->send_error(RC_NOT_FOUND)
- } else { # uri found and mapped to url
- my $extension; # file extension
- if ($url =~ /\.xml$/) { # non gzipped file
- $extension = ".xml";
- } elsif ($url =~ /\.xml\.gz$/) { # gzipped file
- $extension = ".xml.gz";
- } else { # error: unknown extension
- die "unexpected extension in url: $url, might be '.xml'".
- "or '.xml.gz'";
- }
-
- if (not isRdfUri ($inputuri)) { # save in uri std cache dir
- $filename = $helm_dir.$filename.$extension;
- } else { # save in rdf metadata cache dir
- $filename = $helm_rdf_dir."/".$filename.$extension;
- }
-
- print_request($inputuri,$url,$filename);
-
- # Retrieves the file
- my $ciccontent = download($patch_dtd,$url,$filename,$answerformat);
-
- if ($answerformat eq "normal") { # answer the client in text/xml
- answer($c,$ciccontent,"text/xml","");
- } else { # answer the client in text/xml, gzip encoding
- answer($c,$ciccontent,"text/xml","x-gzip");
- }
- }
-
- # "/register" does not work with rdf uris
- } elsif ($http_method eq 'GET' and $http_path eq "/register") {
- my $inputurl = $cgi->param('url');
- print "Register requested...\n";
- $xml_map{$inputuri}=$inputurl;
-
- # Now let's clean the cache
- my $cicfilename = $inputuri;
- $cicfilename =~ s/cic:(.*)/$1/;
- $cicfilename =~ s/theory:(.*)/$1/;
-
- print "Unlinking ".$helm_dir.$cicfilename.".xml[.gz]\n";
- unlink ($helm_dir.$cicfilename.".xml");
- unlink ($helm_dir.$cicfilename.".xml.gz");
-
- kill(USR1,getppid()); # signal changes to parent
- untie %xml_map;
- print "done.\n";
- html_nice_answer($c,"Register done");
-
- # "/resolve" works with rdf uri
- } elsif ($http_method eq 'GET' and $http_path eq "/resolve") {
- #my $outputurl = $xml_map{$inputuri};
- my $outputurl = resolve($inputuri);
- $outputurl = "" if (not defined($outputurl));
- $cont = "<?xml version=\"1.0\" ?>\n\n";
- if ($outputurl eq "") {
- $cont .= "<unresolved />\n";
- } else {
- $cont .= "<url value=\"$outputurl\" />\n";
- }
- answer($c,$cont,"text/xml","");
-
- } elsif ($http_method eq 'GET' and $http_path eq "/getdtd") {
-
- my $filename = $inputuri;
- $filename = $dtd_dir."/".$filename;
- print "DTD: $inputuri ==> ($filename)\n";
- if (stat($filename)) {
- print "Using local copy\n";
- open(FD, $filename) or die "Cannot open $filename\n";
- $cont = "";
- while(<FD>) {
- # Vary bad heuristic for substituion of absolute URLs
- # for relative ones
- s/ENTITY (.*) SYSTEM\s+"/ENTITY $1 SYSTEM "$myownurl\/getdtd?uri=/g;
- $cont .= $_;
- }
- close(FD);
- answer($c,$cont,"text/xml","");
- } else {
- die "Could not find DTD!";
- }
-
- } elsif ($http_method eq 'GET' and $http_path eq "/getxslt") {
-
- $url = $xslt_map{$inputuri};
- print "Downloading XSLT ...\n";
- helm_wget($tmp_dir, $url);
- print "XSLT downloaded!\n";
- $inputuri =~ s/.*\///;
- my $filename = $tmp_dir . "/" . $inputuri;
- my $cont;
- die "Could not find XSLT!\n" unless stat($filename);
- open(FD, $filename) or die "Can't open xslt local copy: '$filename'\n";
- while(<FD>) {
- s/xsl:import\s+href="/xsl:import href="$myownurl\/getxslt?uri=/g;
- s/xsl:include\s+href="/xsl:include href="$myownurl\/getxslt?uri=/g;
- $cont .= $_;
- }
- close(FD);
- answer($c, $cont, "text/xml", "");
- unlink $filename or
- print "Can't unlink XSLT temp file '$filename'";
-
-# <old_version>
-# my $filename = $inputuri;
-# $filename = $style_dir."/".$filename;
-# print "XSLT: $inputuri ==> ($filename)\n";
-# if (stat($filename)) {
-# print "Using local copy\n";
-# open(FD, $filename) or die "Cannot open $filename\n";
-# $cont = "";
-# while(<FD>) {
-# # Vary bad heuristic for substituion of absolute URLs
-# # for relative ones
-# s/xsl:import\s+href="/xsl:import href="$myownurl\/getxslt?uri=/g ;
-# s/xsl:include\s+href="/xsl:include href="$myownurl\/getxslt?uri=/g ;
-# $cont .= $_;
-# }
-# close(FD);
-# answer($c,$cont,"text/xml","");
-# } else {
-# die "Could not find XSLT!";
-# }
-# </old_version>
-
- # "/update" works with rdf uri
- } elsif ($http_method eq 'GET' and $http_path eq "/update") {
- # rebuild urls_of_uris db and rdf uris db
- print "Update requested...\n";
- update_dbs();
- kill(USR1,getppid()); # signal changes to parent
- print " done\n";
- html_nice_answer($c,"Update done");
-
- # "/getalluris" does not work with rdf uris
- } elsif ($http_method eq 'GET' and $http_path eq "/getalluris") {
- # send back all the keys in xml
- print "BASEURI $baseuri, FORMAT $outype\n";
- $cont = getalluris();
- answer($c,$cont,"text/xml","");
-
- # "/getallrdfuris"
- } elsif ($http_method eq 'GET' and $http_path eq "/getallrdfuris") {
- # send back all the keys in xml
- my $class = $cgi->param('class');
- print "BASEURI $baseuri, FORMAT $outype, CLASS $class\n";
- $cont = getallrdfuris($class);
- answer($c,$cont,"text/xml","");
-
- } elsif ($http_method eq 'GET' and $http_path eq "/ls") {
- # send back keys that begin with a given uri
- my ($uritype,$uripattern,$uriprefix);
- my $baseuri = $cgi->param('baseuri');
- chop $baseuri if ($baseuri =~ /.*\/$/); # remove trailing "/"
- # output type, might be 'txt' or 'xml':
- my $outype = $cgi->param('format');
- $uripattern = $baseuri;
- $uripattern =~ s/^.*:(.*)/$1/;
- if ($baseuri =~ /^cic:/) {
- $uritype = "cic";
- } elsif ($baseuri =~ /^theory:/) {
- $uritype = "theory";
- } else {
- $uritype = "invalid";
- }
- if ($uritype ne "invalid") { # uri is valid
- if (($outype ne 'txt') and ($outype ne 'xml')) { # invalid out type
- print "Invalid output type specified: $outype\n";
- html_nice_answer($c,"Invalid output type, must be ".
- "'txt' or 'xml'");
- } else { # valid output
- print "BASEURI $baseuri, FORMAT $outype\n";
- $cont = finduris($uritype,$uripattern,$outype);
- if ($outype eq 'txt') {
- answer($c,$cont,"text/plain","");
- } elsif ($outype eq 'xml') {
- answer($c,$cont,"text/xml","");
- } else {
- die "Internal error, exiting!";
- }
- }
- } else { # invalid uri
- print "Invalid uri: $baseuri, may begin with 'cic:', ".
- "'theory:' or '*:'\n";
- html_nice_answer($c,"Invalid uri , must begin with ".
- "'cic:' or 'theory:'");
- }
-
- } elsif ($http_method eq 'GET' and $http_path eq "/help") {
- # help request
- print "Help requested!\n";
- html_nice_answer($c,"HTTP Getter Version: $VERSION");
-
- } elsif ($http_method eq 'GET' and $http_path eq "/getempty") {
- # return an empty, but valid, xml document
- my $emptyxml = <<EOXML;
-<?xml version="1.0"?>
-<!DOCTYPE empty [
- <!ELEMENT empty EMPTY>
-]>
-<empty />
-EOXML
- answer($c, $emptyxml, "", "");
-
- } elsif ($http_method eq 'GET' and $http_path =~ /\.cgi$/) {
- # cgi handling
- print "CGI requested!\n";
- if ($http_path !~ /^\/[^\/]*\.cgi$/) {
- html_nice_answer($c,"Invalid CGI name: $http_path, ".
- "you can't request CGI that contain a slash in the name\n");
- } elsif (stat "$cgi_dir"."$http_path") {
- if (not -x "$cgi_dir/$http_path") {
- html_nice_answer($c,"CGI $http_path found but not ".
- "executable\n");
- } else { # exec CGI and anser back its output
- my %old_ENV = %ENV;
- %ENV = ();
- $ENV{'QUERY_STRING'} = $http_query;
- my $cgi_output = `$cgi_dir/$http_path`;
- answer($c,$cgi_output,"","");
- %ENV = %old_ENV;
- }
- } else {
- html_nice_answer($c,"CGI '$http_path' not found ".
- "in CGI dir '$cgi_dir'");
- }
-
- } else { # unsupported request
- print "\n";
- print "INVALID REQUEST!!!!!\n";
- print "(PATH: ",$http_path,", ";
- print "QUERY: ",$http_query,")\n";
- $c->send_error(RC_FORBIDDEN)
- }
-
- print "\nRequest solved: ".$r->url."\n\n";
- }
-
- $c->close;
- undef($c);
- print "\nCONNECTION CLOSED\n\n";
- exit;
- } # fork
-}
-
-#================================
-
-sub isRdfUri { # return true if the uri is an rdf uri, false otherwise
-# typycal rdf uri:
-# helm:rdf/cic:www.cs.unibo.it/helm/rdf/foo_schema//cic:\
-# /Coq/Init/Logic/True_rec.con.types
-#
-# the format is "helm:rdf/<metadata_tree>:<metadata_scheme>//<xml_file_uri>"
-#
- my ($uri) = @_;
- if ($uri =~ /^helm:rdf(.*):(.*)\/\/(.*)/) {
- return 1;
- } else {
- return 0;
- }
-}
-
-sub resolve { # resolve an uri in a url, work both with standard cic: or theory:
- # uris and rdf uris
- print "RESOLVE subroutine\n";
- my ($uri) = @_;
- print "GIVEN URI: \"$uri\"\n";
- if (isRdfUri ($uri)) { # rdf uri, resolve using rdf db
- print "IS A RDF URI\n";
- print "I WILL RETURN '$rdf_map{$uri}'\n";
- return ($rdf_map{$uri});
- } else { # standard cic: or theory: uri, resolve using std uri db
- print "IS NOT A RDF URI\n";
- print "I WILL RETURN '$xml_map{$uri}'\n";
- return ($xml_map{$uri});
- }
-}
-
-sub getalluris { # get all the keys whose prefix is cic
- my $content = "";
- my ($uri);
- my $debug=1; # for debug
-
- $content .= '<?xml version="1.0" encoding="ISO-8859-1"?>' . "\n";
- $content .= "<!DOCTYPE alluris SYSTEM ";
- $content .= "\"$myownurl/getdtd?uri=alluris.dtd\">" . "\n\n";
- $content .= "<alluris>\n";
- foreach $uri (sort (keys(%xml_map))) { # select matching uris
- if ($uri =~ /^cic:/ && not $uri =~ /.types$/) {
- print "GETALLURI: $uri\n" if defined($debug);
- $content .= "\t<uri value=\"$uri\"/>\n";
- }
- }
- $content .= "</alluris>\n";
- return $content;
-}
-
-sub getallrdfuris {
- my $class = $_[0];
- my $content = "";
- my ($uri);
- my $debug=1; # for debug
-
- $content .= '<?xml version="1.0" encoding="ISO-8859-1"?>' . "\n";
- $content .= "<!DOCTYPE allrdfuris SYSTEM ";
- $content .= "\"$myownurl/getdtd?uri=alluris.dtd\">" . "\n\n";
- $content .= "<allrdfuris>\n";
- foreach $uri (sort (keys(%rdf_map))) {
- if ($class eq "forward" &&
- $uri =~ /^helm:rdf:www.cs.unibo.it\/helm\/rdf\/forward/
- ||
- $class eq "backward" &&
- $uri =~ /^helm:rdf:www.cs.unibo.it\/helm\/rdf\/backward/) {
- print "GETALLRDFURI: $uri\n" if defined($debug);
- $content .= "\t<uri value=\"$uri\"/>\n";
- }
- }
- $content .= "</allrdfuris>\n";
- return $content;
-}
-
-sub finduris { # find uris for cic and theory trees generation
- my ($uritype,$uripattern,$format) = @_;
- my $content = "";
- my ($uri,$localpart,$basepart,$dirname,$suffix,$flags,$key);
- my (@itemz,@already_pushed_dir);
- my (%objects,%dirs); # map uris to suffixes' flags
- my $debug=1; # for debug
-
- print "FINDURIS, uritype: $uritype, uripattern: $uripattern, ".
- "format: $format\n\n" if defined($debug);
-
- if (($uritype eq "cic") or ($uritype eq "theory")) {
- # get info only of one type: cic or theory
- foreach (keys(%xml_map)) { # select matching uris
- $uri = $_;
- if ($uri =~ /^$uritype:$uripattern(\/|$|\.)/) {
- if ($uri =~ /^$uritype:$uripattern\//) { # directory match
- $localpart = $uri;
- $localpart =~ s/^$uritype:$uripattern\/(.*)/$1/;
- } elsif ($uri =~ /^$uritype:$uripattern($|\.)/) { # file match
- $localpart = $uri;
- $localpart =~ s/^.*\/([^\/]*)/$1/;
- } else {
- die "Internal error, seems that requested match is none of ".
- "directory match or file match";
- }
- print "LOCALPART: $localpart\n" if defined($debug);
-
- if ($localpart =~ /^[^\/]*$/) { # no slash, an OBJECT
- $basepart = $localpart;
- $basepart =~ s/^([^.]*\.[^.]*)((\.body)|(\.types))?(\.ann)?/$1/;
- # remove exts .types, .body,
- # .types.ann or .body.ann
- $flags = $objects{$basepart}; # get old flags
- if ($localpart =~ /\.ann$/) {
- $flags = add_flag("ann","YES",$flags);
- } else {
- $flags = add_flag("ann","NO",$flags);
- }
- if ($localpart =~ /\.types$/) {
- $flags = add_flag("types","YES",$flags);
- } elsif ($localpart =~ /\.types\.ann$/) {
- $flags = add_flag("types","ANN",$flags);
- } else {
- $flags = add_flag("types","NO",$flags);
- }
- if ($localpart =~ /\.body$/) {
- $flags = add_flag("body","YES",$flags);
- } elsif ($localpart =~ /\.body\.ann$/) {
- $flags = add_flag("body","ANN",$flags);
- } else {
- $flags = add_flag("body","NO",$flags);
- }
- $objects{$basepart} = $flags; # save new flags
- } else { # exists at least one slash, a DIR
- ($dirname) = split (/\//, $localpart);
- $dirs{$dirname} = ""; # no flags requirement for dir
- }
- }
- }
- } else {
- die "getter internal error: unsupported uritype: \"$uritype\"";
- }
- # now generate OUTPUT:
- # output will be saved in $content
- if ($format eq "txt") { # TXT output
- foreach $key (sort(keys %dirs)) {
- $content .= "dir, " . $key . "\n";
- }
- foreach $key (sort(keys %objects)) {
- $content .= "object, $key, " . $objects{$key} . "\n";
- }
- } elsif ($format eq "xml") { # XML output
- $content .= '<?xml version="1.0" encoding="ISO-8859-1"?>' . "\n";
- $content .= "<!DOCTYPE ls SYSTEM ";
- $content .= "\"$myownurl/getdtd?uri=ls.dtd\">" . "\n\n";
- $content .= "<ls>\n";
- foreach $key (sort(keys %dirs)) {
- $content .= "\t<section>$key</section>\n";
- }
- foreach $key (sort(keys %objects)) {
- $content .= "\t<object name=\"$key\">\n";
- $flags = $objects{$key};
- $flags =~ s/^<(.*)>$/$1/;
- my ($annflag,$typesflag,$bodyflag) = split /,/,$flags;
- $content .= "\t\t<ann value=\"$annflag\" />\n";
- $content .= "\t\t<types value=\"$typesflag\" />\n";
- $content .= "\t\t<body value=\"$bodyflag\" />\n";
- $content .= "\t</object>\n";
- }
- $content .= "</ls>\n";
- } else { # may not enter this branch
- die "Getter internal error: invalid format received by finduris sub";
- }
- return $content;
-}
-
-sub add_flag {
-# manage string like: "<ann_flag,type_flag,body_flag>"
-# "ann_flag" may be one of "ann_YES", "ann_NO"
-# "type_flag" may be one of "types_NO", "types_YES", "types_ANN"
-# "body_flag" may be one of "body_NO", "body_YES", "body_ANN"
-# when adding a flag the max between the current flag and the new flag
-# is taken, the orders are ann_NO < ann_YES, types_NO < types_YES <
-# types_ANN and body_NO < body_YES < body_ANN
- my ($flagtype,$newflag,$str) = @_;
- $str = "<,,>" if ($str eq "");
- ($str =~ s/^<(.*,.*,.*)>$/$1/) or die "Internal error: ".
- "wrong string format for flag adding in $str";
- my ($annflag,$typeflag,$bodyflag) = split /,/,$str;
- if ($flagtype eq "ann") { # ANN flag handling
- if ($newflag eq "YES") {
- $annflag = "YES";
- } elsif ($newflag eq "NO") {
- $annflag = "NO" unless ($annflag eq "YES");
- } else {
- die "Internal error: annflag must be \"YES\" or \"NO\"";
- }
- } elsif ($flagtype eq "types") { # TYPES flag handling
- if ($newflag eq "ANN") {
- $typeflag = "ANN";
- } elsif ($newflag eq "YES") {
- $typeflag = "YES" unless ($typeflag eq "ANN");
- } elsif ($newflag eq "NO") {
- $typeflag = "NO"
- unless (($typeflag eq "ANN") or ($typeflag eq "YES"));
- } else {
- die "Internal error: typeflag must be \"YES\", \"NO\" or \"ANN\"";
- }
- } elsif ($flagtype eq "body") { # BODY flag handling
- if ($newflag eq "ANN") {
- $bodyflag = "ANN";
- } elsif ($newflag eq "YES") {
- $bodyflag = "YES" unless ($bodyflag eq "ANN");
- } elsif ($newflag eq "NO") {
- $bodyflag = "NO"
- unless (($bodyflag eq "ANN") or ($bodyflag eq "YES"));
- } else {
- die "Internal error: typeflag must be \"YES\", \"NO\" or \"ANN\"";
- }
- } else {
- die "Internal error: unsupported flagtype \"$flagtype\"";
- }
- $str = "<$annflag,$typeflag,$bodyflag>";
-}
-
-#CSC: Too much powerful: creates even /home, /home/users/, ...
-#CSC: Does not raise errors if could not create dirs/files
-sub mkdirs
-{
- my ($pathname) = @_;
- my @dirs = split /\//,$pathname;
- my $tmp;
- foreach $dir (@dirs) {
- $tmp = ((defined($tmp)) ? $tmp."\/".$dir : "");
- mkdir($tmp,0777);
- }
- rmdir($tmp);
-}
-
-sub print_request
-{
- my ($uri,$url,$filename) = @_;
- print "<download_request>\n";
- print "uri: $uri\n";
- print "url: $url\n";
- print "filename: $filename\n\n";
- print "</download_request>\n";
-}
-
-sub gunzip { # gunzip a file and return the deflated content
- my ($filename) = @_;
-
- my ($gz, $buffer, $cont);
-
- print "deflating $filename ...\n";
- $gz = gzopen($filename, "r")
- or die "Cannot open gzip'ed file $filename: $gzerrno";
- $cont = "";
- while ( $gz->gzread($buffer) > 0 ) {
- $cont .= $buffer;
- }
- die "Error while reading : $gzerrno\n" if $gzerrno != Z_STREAM_END ;
- $gz->gzclose();
-
- return $cont;
-}
-
-sub gzip { # gzip the content argument and save it to filename argument
- my ($cont, $filename) = @_;
- #my $debug=1; # debug only
-
- print "gzopening $filename ...\n" if (defined($debug));
- my $gz = gzopen($filename, "w")
- or die "Cannot gzopen for writing file $filename: $gzerrno";
- print "gzwriting ...\n" if (defined($debug));
- $gz->gzwrite($cont) or die "error writing: $gzerrno, exiting!\n";
- print "gzclosing ...\n" if (defined($debug));
- $gz->gzclose();
-}
-
-sub download {
- my ($patch_dtd,$url,$filename,$format) = @_;
- my ($gz, $buffer);
-
-# print "DOWNLOAD subs receives url: \"$url\"\n";
-# print "DOWNLOAD subs receives filename: \"$filename\"\n";
-
- my $resourcetype; # retrieve mode: "normal" (.xml) or "gzipped" (.xml.gz)
- if ($filename =~ /\.xml$/) { # set retrieve mode
- $resourcetype = "normal";
- } elsif ($filename =~ /\.xml\.gz$/) {
- $resourcetype = "gzipped";
- } else {
- die "Unsupported download extension, might be '.gz' or '.xml'\n";
- }
- my $basefname = $filename;
- $basefname =~ s/\.gz$//; # get base resource name removing trailing .gz
- $cont = ""; # modified by side-effect by the callback function
-
- my $localfname="";
- if (stat($basefname)) {
- $localfname=$basefname;
- } elsif (stat($basefname.".gz")) {
- $localfname=$basefname.".gz";
- }
- if ($localfname ne "") { # we already have local copy of requested file
- # check both possible cache entry: gzipped or normal
- print "Using local copy.\n";
- if ($localfname =~ /\.xml\.gz$/) { # deflating cached file and return it
- $cont = gunzip($localfname);
- } elsif ($localfname =~ /\.xml$/) { # just return cached file
- open(FD, $localfname) or die "Cannot open $localfname";
- while(<FD>) { $cont .= $_; }
- close(FD);
- } else { # error
- die "Internal error: unexpected file name $localfname,"
- ."must end with '.gz' or '.xml.gz'\n";
- }
- } else { # download file from net
- print "Downloading file ...\n"; # download file
- my $ua = LWP::UserAgent->new;
- my $request = HTTP::Request->new(GET => "$url");
- my $response = $ua->request($request, \&callback);
-
- # cache retrieved file to disk
- # <ZACK/> TODO: inefficent, I haven't yet undestood how to deflate
- # in memory gzipped file, without call "gzopen"
- print "Storing file ...\n";
-# print "Making dirs ...\n";
- mkdirs($filename);
-# print "Opening tmp file for writing ...\n";
- open(FD, ">".$filename.".tmp") or die "Cannot open $filename.tmp\n";
-# print "Writing on tmp file ...\n";
- print FD $cont;
-# print "Closing tmp file ...\n";
- close(FD);
-
- # handle cache conversion normal->gzipped or gzipped->normal as user choice
- print "cachemode:$cachemode, resourcetype:$resourcetype\n"
- if (defined($debug));
- if (($cachemode eq 'normal') and ($resourcetype eq 'normal')) {
- # cache the file as is
- rename "$filename.tmp", $filename;
- } elsif (($cachemode eq 'gzipped') and ($resourcetype eq 'gzipped')) {
- # cache the file as is
- # and update the $cont variabile with deflated content
- rename "$filename.tmp", $filename;
- $cont = gunzip($filename);
- } elsif (($cachemode eq 'normal') and ($resourcetype eq 'gzipped')) {
- # deflate cache entry
- # and update $cont
- open(FD, "> $basefname") or die "cannot open $basefname\n";
- $cont = gunzip($filename.".tmp");
- print FD $cont;
- close(FD);
- unlink "$filename.tmp"; # delete old gzipped file
- } elsif (($cachemode eq 'gzipped') and ($resourcetype eq 'normal')) {
- # compress cache entry
- print "gzipping ...\n" if (defined($debug));
- gzip($cont, $basefname.".gz");
- unlink "$filename.tmp"; # delete old uncompressed file
- } else {
- die "Internal error, unsopported cachemode, resourcetype couple\n";
- }
- # $cont now contained uncompressed data
- }
- if ($patch_dtd eq "yes") {
- $cont =~ s/DOCTYPE (.*) SYSTEM\s+"$dtdbaseurl\//DOCTYPE $1 SYSTEM "$myownurl\/getdtd?uri=/g;
- }
- if ($format eq "gz") {
- gzip($cont,"$basefname.tmp");
- open (TMP, "< $basefname.tmp")
- or die "Can't open tempfile: $filename.tmp, exiting!\n";
- $cont = "";
- while(<TMP>) {
- $cont .= $_;
- }
- close TMP;
- unlink ($basefname . ".tmp") or
- die "cannot unlink temporary file: $basefname.tmp\n";
- }
-
- return $cont;
-}
-
-sub answer {
-# answer the client setting content, Content-Type and Content-Enconding
-# of the answer
- my ($c,$cont,$contype,$contenc) = @_;
- my $res = new HTTP::Response;
- $res->content($cont);
- $res->push_header("Content-Type" => $contype)
- unless ($contype eq "");
- $res->push_header("Content-Encoding" => $contenc)
- unless ($contenc eq "");
- $res->push_header("Cache-Control" => "no-cache");
- $res->push_header("Pragma" => "no-cache");
- $res->push_header("Expires" => "0");
- $c->send_response($res);
- $c->force_last_request();
-}
-
-sub html_nice_answer {
-# answer the client whith a nice html document
- my ($c,$content) = @_;
- $content = "<html><body><h1>$content</h1></body></html>";
- answer($c,$content,"text/html","");
-}
-
-sub callback {
- my ($data) = @_;
- $cont .= $data;
-}
-
-sub helm_wget {
-# retrieve a file from an url and write it to a temp dir
-# used for retrieve resource index from servers
- $cont = "";
- my ($prefix, $URL) = @_;
- my $ua = LWP::UserAgent->new;
- my $request = HTTP::Request->new(GET => "$URL");
- my $response = $ua->request($request, \&callback);
- my ($filename) = reverse (split "/", $URL); # get filename part of the URL
- open (TEMP, "> $prefix/$filename")
- || die "Cannot open temporary file: $prefix/$filename\n";
- print TEMP $cont;
- close TEMP;
-}
-
-sub update {
-# retie dbs
- untie %xml_map;
- tie(%xml_map, 'DB_File', $uris_dbm, O_RDWR, 0664);
- untie %rdf_map;
- tie(%rdf_map, 'DB_File', $rdf_dbm, O_RDWR, 0664);
- untie %xslt_map;
- tie(%xslt_map, 'DB_File', $xslt_dbm, O_RDWR, 0664);
-}
-
-sub update_dbs {
-# rebuild dbs fetching resource indexes from servers.
-# Rebuild urls_of_uris db (1), rdf db (2) and xslt db (3)
- my (
- $server, $idxfile, $rdf_idxfile, $uri, $url, $comp, $line,
- @servers,
- %urls_of_uris, %rdf, %xslt # local proxy of dbs
- );
-
- untie %xml_map;
- untie %rdf_map;
- untie %xslt_map;
- foreach my $file ($uris_dbm, $rdf_dbm, $xslt_dbm) { # remove old db file
- if (stat $file) { # remove if exists
- unlink ($file) or die "can't unlink old db file: $file\n";
- }
- }
- tie(%urls_of_uris, 'DB_File', $uris_dbm, O_RDWR|O_CREAT, 0664);
- tie(%rdf, 'DB_File', $rdf_dbm, O_RDWR|O_CREAT, 0664);
- tie(%xslt, 'DB_File', $xslt_dbm, O_RDWR|O_CREAT, 0664);
-
- open (SRVS, "< $servers_file") or
- die "cannot open servers file: $servers_file\n";
- @servers = <SRVS>; # read all servers
- close (SRVS);
-
- while ($server = pop @servers) { # cicle on servers in _reverse_ order
- print "processing server: $server ...\n";
- chomp $server;
- helm_wget($tmp_dir, $server."/".$indexname); # get index
- helm_wget($tmp_dir, $server."/".$rdf_indexname); # get rdf index
- helm_wget($tmp_dir, $server."/".$xslt_indexname); # get xslt index
- $idxfile = $tmp_dir."/".$indexname;
- $rdf_idxfile = $tmp_dir."/".$rdf_indexname;
- $xslt_idxfile = $tmp_dir . "/" . $xslt_indexname;
-
- # (1) REBUILD URLS_OF_URIS DB
- open (INDEX, "< $idxfile") or
- die "cannot open temporary index file: $idxfile\n";
- while (my $line = <INDEX>) { # parse index and add entry to urls_of_uris db
- chomp $line;
- ($uri,$comp) = split /[ \t]+/, $line;
- # build url:
- if ($comp =~ /gz/) {
- $url = $uri . ".xml" . ".gz";
- } else {
- $url = $uri . ".xml";
- }
- $url =~ s/cic:/$server/;
- $url =~ s/theory:/$server/;
- $urls_of_uris{$uri} = $url;
- }
-
- # (2) REBUILD RDF DB
- open (RDF_INDEX, "< $rdf_idxfile") or
- die "cannot open temporary RDF index file: $rdf_idxfile\n";
- while (my $line = <RDF_INDEX>) { # parse index and add entry to rdf db
- chomp $line;
- ($uri,$comp) = split /[ \t]+/, $line; # comp is "gz" or nothing
- # build url:
- if ($comp =~ /gz/) {
- $url = $uri . ".xml" . ".gz";
- } else {
- $url = $uri . ".xml";
- }
- $url =~ s/^helm:rdf(.*)\/\/cic:/$server/;
- $url =~ s/^helm:rdf(.*)\/\/theory:/$server/;
- $rdf{$uri} = $url;
- }
-
- # (3) REBUILD XSLT DB
- open (XSLT_INDEX, "< $xslt_idxfile") or
- die "cannot open temporary XSLT index file: $xslt_idxfile\n";
- while (my $line = <XSLT_INDEX>) { # parse index and add entry to xslt db
- chomp $line;
- my $stylesheet = $line;
- my $url = $server . "/" . $stylesheet;
- $xslt{$stylesheet} = $url;
- }
-
- close INDEX; # close indexes
- close RDF_INDEX;
- close XSLT_INDEX;
-
- # remove temp files
- foreach my $file ($idxfile, $rdf_idxfile, $xslt_idxfile) {
- print "cannot unlink temporary file: $file\n" if (unlink $file) != 1;
- }
-
- }
-
- untie(%urls_of_uris); # untie local proxies
- untie(%rdf);
- untie(%xslt);
- tie(%xml_map, 'DB_File', $uris_dbm, O_RDWR, 0664); # retie global ones
- tie(%rdf_map, 'DB_File', $rdf_dbm, O_RDWR, 0664);
- tie(%xslt_map, 'DB_File', $xslt_dbm, O_RDWR, 0664);
-
-} # update_dbs
-
-# vim modline: do not remove!
-# vim: set ft=perl:
-
projects / helm.git / commitdiff