#!@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 (%map, %rdf_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 # 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"; } my $helm_rdf_dir = $ENV{'HTTP_GETTER_RDF_DIR'} || "/usr/local/helm/rdf_library"; my $rdf_dbm = $ENV{'HTTP_GETTER_RDF_DBM'} || "/usr/local/helm/rdf_urls_of_uris"; my $rdf_indexname = $ENV{'HTTP_GETTER_RDF_INDEXNAME'} || "rdf_index.txt"; # # 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::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 => 8081; 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(%map, 'DB_File', $uris_dbm.".db", O_RDWR, 0664); # open dbs tie(%rdf_map, 'DB_File', $rdf_dbm.".db", O_RDWR, 0664); print "\n"; print "HTTP Getter $VERSION\n"; # print hello information print "Please contact me at: \n"; print "\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.db\n"; print "rdf db: $rdf_dbm.db\n"; print "cache mode: $cachemode\n"; print "indexname: $indexname\n"; print "rdf_indexname: $rdf_indexname\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"; $map{$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.$cicfilename.".xml.gz"); kill(USR1,getppid()); # signal changes to parent untie %map; print "done.\n"; html_nice_answer($c,"Register done"); # "/resolve" works with rdf uri } elsif ($http_method eq 'GET' and $http_path eq "/resolve") { #my $outputurl = $map{$inputuri}; my $outputurl = resolve($inputuri); $outputurl = "" if (not defined($outputurl)); $cont = "\n\n"; if ($outputurl eq "") { $cont .= "\n"; } else { $cont .= "\n"; } answer($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() { # 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 "/getstyleconf") { my $filename = $inputuri; $filename = $style_dir."/config/".$filename; if (stat($filename)) { open(FD, $filename) or die "Cannot open $filename\n"; $cont = ""; while() { s/DOCTYPE (.*) SYSTEM\s+"/DOCTYPE $1 SYSTEM "$myownurl\/getstyleconf?uri=/g; $cont .= $_; } close(FD); answer($c,$cont,"text/plain",""); } else { die "Could not find Style Configuration File!"; } } elsif ($http_method eq 'GET' and $http_path eq "/getxslt") { 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"; $cont = ""; while() { # Vary bad heuristic for substituion of absolute URLs # for relative ones s/xsl:import\s+href="/xsl:import href="$myownurl\/getxslt?uri=/g ; s/xsl:include\s+href="/xsl:include href="$myownurl\/getxslt?uri=/g ; $cont .= $_; } close(FD); answer($c,$cont,"text/xml",""); } else { die "Could not find XSLT!"; } # "/update" works with rdf uri } elsif ($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"); # "/ls" does not work with rdf uris } 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 $http_path =~ /\.cgi$/) { # 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/://" # 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{$uri}); } else { # standard cic: or theory: uri, resolve using std uri db print "IS NOT A RDF URI\n"; print "I WILL RETURN '$map{$uri}'\n"; return ($map{$uri}); } } sub finduris { # find uris for cic and theory trees generation my ($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(%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/^([^.]*\.[^.]*)(\.types)?(\.ann)?/$1/; # remove exts .types or # .types.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); } $objects{$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 .= '' . "\n"; $content .= "" . "\n\n"; $content .= "\n"; foreach $key (sort(keys %dirs)) { $content .= "\t
$key
\n"; } foreach $key (sort(keys %objects)) { $content .= "\t\n"; $flags = $objects{$key}; $flags =~ s/^<(.*)>$/$1/; my ($annflag,$typesflag) = split /,/,$flags; $content .= "\t\t\n"; $content .= "\t\t\n"; $content .= "\t\n"; } $content .= "
\n"; } else { # may not enter this branch die "Getter internal error: invalid format received by finduris sub"; } return $content; } sub add_flag { # manage string like: "" # "ann_flag" may be one of "ann_YES", "ann_NO" # "type_flag" may be one of "types_NO", "types_YES", "types_ANN" # when adding a flag the max between the current flag and the new flag # is taken, the orders are ann_NO < ann_YES and types_NO < types_YES < # types_ANN my ($flagtype,$newflag,$str) = @_; $str = "<,>" if ($str eq ""); ($str =~ s/^<(.*,.*)>$/$1/) or die "Internal error: ". "wrong string format for flag adding in $str"; my ($annflag,$typeflag) = split /,/,$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 ($typeflag eq "YES")); } else { die "Internal error: typeflag must be \"YES\", \"NO\" or \"ANN\""; } } else { die "Internal error: unsupported flagtype \"$flagtype\""; } $str = "<$annflag,$typeflag>"; } #CSC: Too much powerful: creates even /home, /home/users/, ... #CSC: Does not raise errors if could not create dirs/files sub mkdirs { my ($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 "\n"; print "uri: $uri\n"; print "url: $url\n"; print "filename: $filename\n\n"; print "\n"; } sub callback { my ($data) = @_; $cont .= $data; } sub gunzip { # gunzip a file and return the deflated content my ($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() { $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 # 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+"http:\/\/www.cs.unibo.it\/helm\/dtd\//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() { $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); } sub html_nice_answer { # answer the client whith a nice html document my ($c,$content) = @_; $content = "

$content

"; answer($c,$content,"text/html",""); } 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 %map; tie(%map, 'DB_File', $uris_dbm.".db", O_RDWR, 0664); untie %rdf_map; tie(%rdf_map, 'DB_File', $rdf_dbm.".db", O_RDWR, 0664); } sub update_dbs { # rebuild dbs fetching resource indexes from servers. # Rebuild urls_of_uris db (1) and rdf db (2) my ( $server, $idxfile, $rdf_idxfile, $uri, $url, $comp, $line, @servers, %urls_of_uris, %rdf # local proxy of $map and $rdf_map ); untie %map; untie %rdf_map; foreach my $file ($uris_dbm, $rdf_dbm) { # remove old db file if (stat $file.".db") { # remove if exists unlink ($file.".db") or die "can't unlink old db file: $file.db\n"; } } tie(%urls_of_uris, 'DB_File', $uris_dbm.".db", O_RDWR|O_CREAT, 0664); tie(%rdf, 'DB_File', $rdf_dbm.".db", O_RDWR|O_CREAT, 0664); open (SRVS, "< $servers_file") or die "cannot open servers file: $servers_file\n"; @servers = ; # read all servers close (SRVS); while ($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 $idxfile = $tmp_dir."/".$indexname; $rdf_idxfile = $tmp_dir."/".$rdf_indexname; open (INDEX, "< $idxfile") or # (1) REBUILD URLS_OF_URIS DB die "cannot open temporary index file: $idxfile\n"; while ($line = ) { # 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; } open (RDF_INDEX, "< $rdf_idxfile") or # (2) REBUILD RDF DB die "cannot open temporary rdf index file: $rdf_idxfile\n"; while ($line = ) { # 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; } close INDEX; # close indexes close RDF_INDEX; die "cannot unlink temporary file: $idxfile\n" # remove temp files if (unlink $idxfile) != 1; die "cannot unlink temporary file: $rdf_idxfile\n" if (unlink $rdf_idxfile) != 1; } untie(%urls_of_uris); # untie local proxies untie(%rdf); tie(%map, 'DB_File', $uris_dbm.".db", O_RDWR, 0664); # retie global ones tie(%rdf_map, 'DB_File', $rdf_dbm.".db", O_RDWR, 0664); } # update_dbs # vim modline: do not remove! # vim: set ft=perl: