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package WebSource::Query; |
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use strict; |
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use Carp; |
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use WebSource::Module |
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our @ISA = ('WebSource::Module'); |
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=head1 NAME |
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WebSource::Query - Build a query (HTTP request) given a hash |
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=head1 DESCRIPTION |
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A Query operator builds an HTTP query for each input. |
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The declaration of a query operator is a DOM Node with the following format : |
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http://somewhere/query.cgi |
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... |
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=head1 METHODS |
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See WebSource::Module |
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=cut |
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sub _init_ { |
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my $self = shift; |
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$self->SUPER::_init_; |
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my $wsd = $self->{wsdnode} or croak("No description node given\n"); |
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$self->{base_uri} = $wsd->findvalue('base'); |
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$self->{method} = $wsd->getAttribute('method'); |
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} |
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sub handle { |
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my $self = shift; |
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my $env = shift; |
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my ($query, $missing) = $self->build_query($env); |
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if(@$missing) { |
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croak "Missing query parameters :\n\t- '" . join("'\n\t- '",@$missing) . "'\n"; |
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} |
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my $req = $self->make_request($query,$env); |
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return WebSource::Envelope->new( |
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type => "object/http-request", |
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data => $req); |
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} |
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sub build_query { |
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my ($self,$env) = @_; |
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# $env->type eq "hash" or croak("Envelope didn't contain hash\n"); |
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# my $qref = $env->data; |
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my $qref = $env; |
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my @params = $self->{wsdnode}->findnodes('parameters/param'); |
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my @missing; |
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my %query; |
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foreach $_ (@params) { |
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my $name = $_->getAttribute("name"); |
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my $value; |
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$_->hasAttribute("rename") and |
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croak("Deprecated use of attribute rename in query parameters"); |
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if($_->hasAttribute("value-of")){ |
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my $key = $_->getAttribute("value-of"); |
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if (exists($qref->{$key})) { |
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if($qref->{$key}) { |
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$value = ($key eq 'data') ? |
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$env->dataString : |
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$qref->{$key}; |
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} |
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} else { |
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$value = ""; |
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} |
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} |
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if(!defined($value) && $_->hasAttribute("default")) { |
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$value = $_->getAttribute("default"); |
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} |
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if (defined($value)) { |
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$query{$name} = $value; |
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} else { |
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push(@missing, ($name)); |
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} |
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}; |
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return (\%query,\@missing); |
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} |
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sub make_request { |
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my ($self,$query,$env) = @_; |
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my $uri = URI->new($self->{base_uri} ? $self->{base_uri} : $env->dataAsURI); |
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my $qstr; |
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map { |
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$qstr .= "\t". $_ . " => " . $query->{$_} ."\n"; |
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} keys(%$query); |
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$self->log(5,"Built query : \n",$qstr); |
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$uri->query_form(%$query); |
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my $method = $self->{method}; |
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if($method ne "GET") { |
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my $query = $uri->query; |
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$uri->query(undef); |
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my $req = HTTP::Request->new('POST',$uri); |
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$req->content_type("application/x-www-form-urlencoded"); |
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$req->content_length(length($query)); |
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$req->content($query); |
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return $req; |
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} else { |
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return HTTP::Request->new('GET',$uri); |
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} |
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} |
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sub parameters { |
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my ($self) = @_; |
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return map { |
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$_->getAttribute("name") => $_->getAttribute("default") |
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} $self->{wsdnode}->findnodes('parameters/param'); |
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} |
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129
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=head1 SEE ALSO |
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131
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WebSource |
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133
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=cut |
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135
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1; |