735 lines
23 KiB
Perl
735 lines
23 KiB
Perl
package Koha::REST::Plugin::Query;
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# This file is part of Koha.
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#
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# Koha is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# Koha is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Koha; if not, see <https://www.gnu.org/licenses>.
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use Modern::Perl;
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use Mojo::Base 'Mojolicious::Plugin';
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use List::MoreUtils qw( any );
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use Scalar::Util qw( reftype );
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use JSON qw( decode_json );
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use Koha::Exceptions;
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use Koha::Exceptions::REST;
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=head1 NAME
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Koha::REST::Plugin::Query
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=head1 API
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=head2 Mojolicious::Plugin methods
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=head3 register
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=cut
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sub register {
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my ( $self, $app ) = @_;
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=head2 Helper methods
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=head3 extract_reserved_params
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my ( $filtered_params, $reserved_params ) = $c->extract_reserved_params($params);
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Generates the DBIC query from the query parameters.
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=cut
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$app->helper(
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'extract_reserved_params' => sub {
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my ( $c, $params ) = @_;
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my $reserved_params;
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my $filtered_params;
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my $path_params;
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my $reserved_words = _reserved_words();
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my @query_param_names = keys %{ $c->req->params->to_hash };
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foreach my $param ( keys %{$params} ) {
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if ( grep { $param eq $_ } @{$reserved_words} ) {
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$reserved_params->{$param} = $params->{$param};
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} elsif ( grep { $param eq $_ } @query_param_names ) {
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$filtered_params->{$param} = $params->{$param};
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} else {
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$path_params->{$param} = $params->{$param};
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}
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}
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return ( $filtered_params, $reserved_params, $path_params );
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}
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);
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=head3 dbic_merge_sorting
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$attributes = $c->dbic_merge_sorting({ attributes => $attributes, params => $params });
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Generates the DBIC order_by attributes based on I<$params>, and merges into I<$attributes>.
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=cut
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$app->helper(
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'dbic_merge_sorting' => sub {
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my ( $c, $args ) = @_;
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my $attributes = $args->{attributes};
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my $result_set = $args->{result_set};
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my @order_by_styles = (
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'_order_by',
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'_order_by[]'
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);
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my @order_by_params;
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foreach my $order_by_style (@order_by_styles) {
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if ( defined $args->{params}->{$order_by_style}
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and ref( $args->{params}->{$order_by_style} ) eq 'ARRAY' )
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{
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push( @order_by_params, @{ $args->{params}->{$order_by_style} } );
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} else {
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push @order_by_params, $args->{params}->{$order_by_style}
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if defined $args->{params}->{$order_by_style};
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}
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}
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my @THE_order_by;
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foreach my $order_by_param (@order_by_params) {
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my $order_by;
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$order_by = [ split( /,/, $order_by_param ) ]
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if ( !reftype($order_by_param) && index( ',', $order_by_param ) == -1 );
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if ($order_by) {
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if ( reftype($order_by) and reftype($order_by) eq 'ARRAY' ) {
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my @order_by =
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map { _build_order_atom( { string => $_, result_set => $result_set } ) } @{$order_by};
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push( @THE_order_by, @order_by );
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} else {
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push @THE_order_by, _build_order_atom( { string => $order_by, result_set => $result_set } );
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}
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}
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}
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$attributes->{order_by} = \@THE_order_by
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if scalar @THE_order_by > 0;
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return $attributes;
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}
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);
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=head3 dbic_merge_prefetch
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$attributes = $c->dbic_merge_prefetch({ attributes => $attributes, result_set => $result_set });
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Generates the DBIC prefetch attribute based on embedded relations, and merges into I<$attributes>.
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=cut
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$app->helper(
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'dbic_merge_prefetch' => sub {
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my ( $c, $args ) = @_;
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my $attributes = $args->{attributes};
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my $result_set = $args->{result_set};
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my $embed = $c->stash('koha.embed');
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return unless defined $embed;
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my @prefetches;
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my $count_aliases = {};
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foreach my $key ( sort keys( %{$embed} ) ) {
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# Handle +count embeds with SQL-level subquery
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if ( $embed->{$key}->{is_count} ) {
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my $subquery = _merge_count_select( $key, $attributes, $result_set );
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if ($subquery) {
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$count_aliases->{$key} = $subquery;
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next;
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}
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# No DBIC relationship found; mark as unsortable (0) so the order_by
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# fixup rejects it with a 400. Fall through so to_api can use the
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# Koha method ->count fallback for display.
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$count_aliases->{$key} = 0;
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}
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my $parsed = _parse_prefetch( $key, $embed, $result_set, $attributes, undef, $count_aliases );
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push @prefetches, $parsed if defined $parsed;
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}
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if ( scalar(@prefetches) ) {
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$attributes->{prefetch} = \@prefetches;
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}
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# Fix order_by entries referencing count aliases (me.X_count => X_count).
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# dbic_merge_sorting (which runs before this) translates _order_by=-me.claims_count
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# into { -desc => 'me.claims_count' }. But +as aliases are not real table columns,
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# so DBIC needs them without the 'me.' prefix to match the +select subquery.
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if ( $attributes->{order_by} ) {
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for my $i ( 0 .. $#{ $attributes->{order_by} } ) {
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my $atom = $attributes->{order_by}[$i];
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if ( ref($atom) eq 'HASH' ) {
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for my $dir ( keys %{$atom} ) {
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( my $col = $atom->{$dir} ) =~ s/^me\.//;
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# Reject sorting on +count embeds without a DBIC relationship.
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# $count_aliases->{$col} is 0 (unsortable) or missing (top-level unsortable)
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Koha::Exceptions::BadParameter->throw(
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"Cannot sort on $col: no matching database relationship")
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if exists $count_aliases->{$col} && !$count_aliases->{$col};
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# Replace with the literal subquery so DBIC puts it directly
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# in the ORDER BY clause (DBIC +as is Perl-side only, not a SQL alias)
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$atom->{$dir} = $count_aliases->{$col} if $count_aliases->{$col};
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}
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} elsif ( !ref($atom) ) {
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( my $col = $atom ) =~ s/^me\.//;
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Koha::Exceptions::BadParameter->throw("Cannot sort on $col: no matching database relationship")
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if exists $count_aliases->{$col} && !$count_aliases->{$col};
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$attributes->{order_by}[$i] = $count_aliases->{$col} if $count_aliases->{$col};
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}
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}
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}
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}
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);
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=head3 dbic_validate_operators
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$attributes = $c->dbic_validate_operators( { filtered_params => $filtered_params } );
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Validate operators in the passed query.
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=cut
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$app->helper(
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'dbic_validate_operators' => sub {
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my ( $c, $args ) = @_;
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_validate_query( $args->{filtered_params} );
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}
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);
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=head3 _build_query_params_from_api
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my $params = _build_query_params_from_api( $filtered_params, $reserved_params );
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Builds the params for searching on DBIC based on the selected matching algorithm.
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Valid options are I<contains>, I<starts_with>, I<ends_with> and I<exact>. Default is
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I<contains>. If other value is passed, a Koha::Exceptions::WrongParameter exception
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is raised.
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=cut
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$app->helper(
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'build_query_params' => sub {
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my ( $c, $filtered_params, $reserved_params ) = @_;
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my $params;
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my $match = $reserved_params->{_match} // 'contains';
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foreach my $param ( keys %{$filtered_params} ) {
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if ( $match eq 'exact' || $filtered_params->{$param} =~ m[^\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}] ) {
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$params->{$param} = $filtered_params->{$param};
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} elsif ( $match eq 'contains' ) {
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$params->{$param} =
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{ like => '%' . $filtered_params->{$param} . '%' };
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} elsif ( $match eq 'starts_with' ) {
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$params->{$param} = { like => $filtered_params->{$param} . '%' };
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} elsif ( $match eq 'ends_with' ) {
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$params->{$param} = { like => '%' . $filtered_params->{$param} };
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} else {
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# We should never reach here, because the OpenAPI plugin should
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# prevent invalid params to be passed
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Koha::Exceptions::WrongParameter->throw("Invalid value for _match param ($match)");
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}
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}
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return $params;
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}
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);
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=head3 merge_q_params
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$c->merge_q_params( $filtered_params, $q_params, $result_set );
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Merges parameters from $q_params into $filtered_params.
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=cut
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$app->helper(
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'merge_q_params' => sub {
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my ( $c, $filtered_params, $q_params, $result_set ) = @_;
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$q_params = decode_json($q_params) unless reftype $q_params;
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my $params = _parse_dbic_query( $q_params, $result_set );
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return $params unless scalar( keys %{$filtered_params} );
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return { '-and' => [ $params, $filtered_params ] };
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}
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);
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=head3 stash_embed
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$c->stash_embed( { spec => $op_spec } );
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Unwraps and stashes the x-koha-embed headers for use later query construction
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=cut
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$app->helper(
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'stash_embed' => sub {
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my ( $c, $args ) = @_;
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my $embed_header = $c->req->headers->header('x-koha-embed');
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return $c unless $embed_header;
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my $spec = $args->{spec} // {};
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my $embed_spec;
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for my $param ( @{ $spec->{parameters} } ) {
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next unless $param->{name} eq 'x-koha-embed';
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$embed_spec = $param->{items}->{enum};
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}
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Koha::Exceptions::BadParameter->throw("Embedding objects is not allowed on this endpoint.")
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unless defined($embed_spec);
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if ($embed_header) {
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my $THE_embed = {};
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foreach my $embed_req ( split /\s*,\s*/, $embed_header ) {
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if ( $embed_req eq '+strings' ) { # special case
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$c->stash( 'koha.strings' => 1 );
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} else {
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_merge_embed( _parse_embed($embed_req), $THE_embed );
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}
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}
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$c->stash( 'koha.embed' => $THE_embed )
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if $THE_embed;
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}
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return $c;
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}
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);
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=head3 stash_overrides
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# Stash the overrides
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$c->stash_overrides();
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# Use it
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my $overrides = $c->stash('koha.overrides');
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if ( $overrides->{pickup_location} ) { ... }
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This helper method parses the 'x-koha-override' headers and stashes the passed overrides
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in the form of a I<hashref> for easy use in controller methods.
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FIXME: With the currently used JSON::Validator version we use, it is not possible to
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use the validated and coerced data (it doesn't validate array-type headers) so this
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implementation relies on manual parsing. Look at the JSON::Validator changelog for
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reference: https://metacpan.org/changes/distribution/JSON-Validator#L14
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=cut
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$app->helper(
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'stash_overrides' => sub {
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my ($c) = @_;
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my $override_header = $c->req->headers->header('x-koha-override') || q{};
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my $overrides = { map { $_ => 1 } split /\s*,\s*/, $override_header };
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$c->stash( 'koha.overrides' => $overrides );
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return $c;
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}
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);
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=head3 stash_request_id
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# Stash the request ID
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$c->stash_request_id();
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# Use it
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my $request_id = $c->stash('koha.request_id');
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This helper method parses the 'x-koha-request-id' header and stashes the value.
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=cut
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$app->helper(
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'stash_request_id' => sub {
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my ($c) = @_;
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my $request_id = $c->req->headers->header('x-koha-request-id') || q{};
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$c->stash( 'koha.request_id' => $request_id );
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return $c;
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}
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);
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}
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=head2 Internal methods
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=head3 _reserved_words
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my $reserved_words = _reserved_words();
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=cut
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sub _reserved_words {
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my @reserved_words = qw( _match _order_by _order_by[] _page _per_page q );
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return \@reserved_words;
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}
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=head3 _build_order_atom
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my $order_atom = _build_order_atom( $string );
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Parses I<$string> and outputs data valid for using in SQL::Abstract order_by attribute
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according to the following rules:
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string -> I<string>
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+string -> I<{ -asc => string }>
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-string -> I<{ -desc => string }>
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=cut
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sub _build_order_atom {
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my ($args) = @_;
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my $string = $args->{string};
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my $result_set = $args->{result_set};
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my $param = $string;
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$param =~ s/^(\+|\-|\s)//;
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if ($result_set) {
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my $model_param = _from_api_param( $param, $result_set );
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$param = $model_param if defined $model_param;
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}
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if ( $string =~ m/^\+/
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or $string =~ m/^\s/ )
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{
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# asc order operator present
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return { -asc => $param };
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} elsif ( $string =~ m/^\-/ ) {
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# desc order operator present
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return { -desc => $param };
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} else {
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# no order operator present
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return $param;
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}
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}
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=head3 _parse_embed
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my $embed = _parse_embed( $string );
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Parses I<$string> and outputs data valid for passing to the Kohaa::Object(s)->to_api
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method.
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=cut
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sub _parse_embed {
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my $string = shift;
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my $result;
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my ( $curr, $next ) = split /\s*\.\s*/, $string, 2;
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if ($next) {
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$result->{$curr} = { children => _parse_embed($next) };
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} else {
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if ( $curr =~ m/^(?<relation>.*)[\+|:]count/ ) {
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my $key = $+{relation} . "_count";
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$result->{$key} = { is_count => 1 };
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} elsif ( $curr =~ m/^(?<relation>.*)\+strings/ ) {
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my $key = $+{relation};
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$result->{$key} = { strings => 1 };
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} else {
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$result->{$curr} = {};
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}
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}
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return $result;
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}
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=head3 _merge_embed
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_merge_embed( $parsed_embed, $global_embed );
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Merges the hash referenced by I<$parsed_embed> into I<$global_embed>.
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=cut
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sub _merge_embed {
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my ( $structure, $embed ) = @_;
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my ($root) = keys %{$structure};
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if ( any { $root eq $_ } keys %{$embed} ) {
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# Recurse
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_merge_embed( $structure->{$root}, $embed->{$root} );
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} else {
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# Embed
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$embed->{$root} = $structure->{$root};
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}
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}
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=head3 _merge_count_select
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my $added = _merge_count_select( $key, $attributes, $result_set );
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Given a I<$key> like C<claims_count> (from a C<claims+count> embed), strips the C<_count>
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suffix to derive the DBIC relationship name, then uses the relationship metadata to build
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a correlated COUNT subquery added via C<+select>/C<+as>.
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This makes the count available as a virtual column in the SQL result, enabling both
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server-side sorting (ORDER BY) and an efficient single-query count instead of N+1.
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Returns the subquery scalar reference if added (used by the caller to substitute
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into ORDER BY clauses), or undef if the relationship was not found in the
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C<prefetch_whitelist> or has no DBIC relationship info. In the latter case, the count
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embed still works for display: C<to_api> falls back transparently to the original
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C<< $object->$relation->count >> Perl-level call. Only sorting is unavailable.
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Handles both C<Koha::Objects> (plural, via C<_resultset>) and C<Koha::Object> (singular,
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via C<_result>) for accessing the DBIC result source.
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=cut
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sub _merge_count_select {
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my ( $key, $attributes, $result_set ) = @_;
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( my $rel = $key ) =~ s/_count$//;
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return unless exists $result_set->prefetch_whitelist->{$rel};
|
|
|
|
my $subquery = _build_count_subquery( $rel, $result_set, 'me' );
|
|
return unless $subquery;
|
|
|
|
push @{ $attributes->{'+select'} }, $subquery;
|
|
push @{ $attributes->{'+as'} }, $key;
|
|
|
|
return $subquery;
|
|
}
|
|
|
|
=head3 _build_count_subquery
|
|
|
|
my $subquery = _build_count_subquery( $rel, $result_set, $parent_alias );
|
|
|
|
Builds a correlated COUNT subquery scalar ref for the given DBIC relationship.
|
|
I<$parent_alias> is the SQL alias of the parent table (e.g. C<me> for top-level,
|
|
or the relation name for nested embeds like C<biblio>).
|
|
|
|
Returns the scalar ref, or undef if the relationship has no DBIC metadata.
|
|
|
|
=cut
|
|
|
|
sub _build_count_subquery {
|
|
my ( $rel, $result_set, $parent_alias ) = @_;
|
|
|
|
my $source =
|
|
$result_set->can('_resultset')
|
|
? $result_set->_resultset->result_source
|
|
: $result_set->_result->result_source;
|
|
my $rel_info = $source->relationship_info($rel);
|
|
return unless $rel_info;
|
|
|
|
my $rel_table = $source->related_source($rel)->name;
|
|
my $cond = $rel_info->{cond};
|
|
|
|
# NOTE: assumes single-column FK joins. Multi-column FKs would need
|
|
# a compound WHERE clause here. Rare in Koha but worth noting.
|
|
my ($fk_foreign) = keys %{$cond};
|
|
my $fk_self = $cond->{$fk_foreign};
|
|
$fk_foreign =~ s/^foreign\.//;
|
|
$fk_self =~ s/^self\.//;
|
|
|
|
return \"(SELECT COUNT(*) FROM $rel_table WHERE $rel_table.$fk_foreign = $parent_alias.$fk_self)";
|
|
}
|
|
|
|
sub _parse_prefetch {
|
|
my ( $key, $embed, $result_set, $attributes, $parent_alias, $count_aliases ) = @_;
|
|
|
|
$parent_alias //= 'me';
|
|
|
|
my $pref_key = $key;
|
|
$pref_key =~ s/_count$// if $embed->{$key}->{is_count};
|
|
|
|
if ( !exists $result_set->prefetch_whitelist->{$pref_key} ) {
|
|
|
|
# Track unsortable nested +count embeds (no DBIC relationship) so the
|
|
# order_by fixup can reject them with a 400 instead of a DBIC 500
|
|
if ( $embed->{$key}->{is_count} && $count_aliases ) {
|
|
my $alias_key = $parent_alias eq 'me' ? $key : "$parent_alias.$key";
|
|
$count_aliases->{$alias_key} = 0; # 0 = unsortable
|
|
}
|
|
return;
|
|
}
|
|
|
|
# Handle nested +count embeds with SQL-level subquery
|
|
if ( $embed->{$key}->{is_count} && $attributes ) {
|
|
my $subquery = _build_count_subquery( $pref_key, $result_set, $parent_alias );
|
|
if ($subquery) {
|
|
|
|
# Use the full dotted path as the alias key so order_by fixup
|
|
# can match e.g. "biblio.items_count" from _from_api_param
|
|
my $alias_key = $parent_alias eq 'me' ? $key : "$parent_alias.$key";
|
|
push @{ $attributes->{'+select'} }, $subquery;
|
|
push @{ $attributes->{'+as'} }, $alias_key;
|
|
$count_aliases->{$alias_key} = $subquery if $count_aliases;
|
|
return; # no prefetch needed, count is in the subquery
|
|
}
|
|
}
|
|
|
|
my $ko_class = $result_set->prefetch_whitelist->{$pref_key};
|
|
return $pref_key unless defined $embed->{$key}->{children} && defined $ko_class;
|
|
|
|
my @prefetches;
|
|
foreach my $child ( sort keys( %{ $embed->{$key}->{children} } ) ) {
|
|
my $parsed = _parse_prefetch(
|
|
$child, $embed->{$key}->{children}, $ko_class->new, $attributes, $pref_key,
|
|
$count_aliases
|
|
);
|
|
push @prefetches, $parsed if defined $parsed;
|
|
}
|
|
|
|
return $pref_key unless scalar(@prefetches);
|
|
|
|
return { $pref_key => $prefetches[0] } if scalar(@prefetches) eq 1;
|
|
|
|
return { $pref_key => \@prefetches };
|
|
}
|
|
|
|
sub _from_api_param {
|
|
my ( $key, $result_set ) = @_;
|
|
|
|
if ( $key =~ /\./ ) {
|
|
|
|
my ( $curr, $next ) = split /\s*\.\s*/, $key, 2;
|
|
|
|
return $curr . '.' . _from_api_param( $next, $result_set ) if $curr eq 'me';
|
|
|
|
my $ko_class = $result_set->prefetch_whitelist->{$curr};
|
|
|
|
Koha::Exceptions::BadParameter->throw("Cannot find Koha::Object class for $curr")
|
|
unless defined $ko_class;
|
|
|
|
$result_set = $ko_class->new;
|
|
|
|
if ( $next =~ /\./ ) {
|
|
return _from_api_param( $next, $result_set );
|
|
} else {
|
|
return
|
|
$curr . '.'
|
|
. (
|
|
$result_set->from_api_mapping && defined $result_set->from_api_mapping->{$next}
|
|
? $result_set->from_api_mapping->{$next}
|
|
: $next
|
|
);
|
|
}
|
|
} else {
|
|
return defined $result_set->from_api_mapping->{$key} ? $result_set->from_api_mapping->{$key} : $key;
|
|
}
|
|
}
|
|
|
|
sub _parse_dbic_query {
|
|
my ( $q_params, $result_set ) = @_;
|
|
|
|
if ( reftype($q_params) && reftype($q_params) eq 'HASH' ) {
|
|
my $parsed_hash;
|
|
foreach my $key ( keys %{$q_params} ) {
|
|
if ( $key =~ /-?(not_?)?bool/i ) {
|
|
$parsed_hash->{$key} = _from_api_param( $q_params->{$key}, $result_set );
|
|
next;
|
|
}
|
|
my $k = _from_api_param( $key, $result_set );
|
|
$parsed_hash->{$k} = _parse_dbic_query( $q_params->{$key}, $result_set );
|
|
}
|
|
return $parsed_hash;
|
|
} elsif ( reftype($q_params) && reftype($q_params) eq 'ARRAY' ) {
|
|
my @mapped = map { _parse_dbic_query( $_, $result_set ) } @$q_params;
|
|
return \@mapped;
|
|
} else {
|
|
return $q_params;
|
|
}
|
|
}
|
|
|
|
=head3 _validate_operator
|
|
|
|
=cut
|
|
|
|
sub _validate_operator {
|
|
my ($operator) = @_;
|
|
my %allowed_operators =
|
|
map { $_ => 1 }
|
|
qw(= != < > <= >= -in -ident -bool -not_bool -or like -like -not_like -between -not_between -not -and -regexp -not_in);
|
|
Koha::Exceptions::REST::Query::InvalidOperator->throw( operator => $operator )
|
|
unless exists $allowed_operators{$operator};
|
|
return;
|
|
}
|
|
|
|
=head3 _validate_query
|
|
|
|
=cut
|
|
|
|
sub _validate_query {
|
|
my ($query) = @_;
|
|
|
|
if ( ref $query eq 'HASH' ) {
|
|
for my $field ( keys %$query ) {
|
|
my $value = $query->{$field};
|
|
|
|
if ( ref $value eq 'HASH' ) {
|
|
|
|
# Hash reference with operators
|
|
for my $operator ( keys %$value ) {
|
|
_validate_operator($operator);
|
|
}
|
|
} elsif ( ref $value eq 'ARRAY' ) {
|
|
|
|
# Array reference with operator as the first element
|
|
_validate_query($value);
|
|
} else {
|
|
|
|
# Simple key-value pairs (no operator to validate)
|
|
}
|
|
}
|
|
} elsif ( ref $query eq 'ARRAY' ) {
|
|
|
|
# Top-level OR combination or nested AND combination
|
|
for my $element (@$query) {
|
|
if ( ref $element eq 'ARRAY' && scalar @{$element} && $element->[0] eq '-and' ) {
|
|
_validate_query( $element->[1] );
|
|
} else {
|
|
_validate_query($element);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
1;
|