1 package Koha::REST::Plugin::Query;
3 # This file is part of Koha.
5 # Koha is free software; you can redistribute it and/or modify it
6 # under the terms of the GNU General Public License as published by
7 # the Free Software Foundation; either version 3 of the License, or
8 # (at your option) any later version.
10 # Koha is distributed in the hope that it will be useful, but
11 # WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with Koha; if not, see <http://www.gnu.org/licenses>.
20 use Mojo::Base 'Mojolicious::Plugin';
21 use List::MoreUtils qw(any);
22 use Scalar::Util qw(reftype);
23 use JSON qw(decode_json);
29 Koha::REST::Plugin::Query
33 =head2 Mojolicious::Plugin methods
40 my ( $self, $app ) = @_;
44 =head3 extract_reserved_params
46 my ( $filtered_params, $reserved_params ) = $c->extract_reserved_params($params);
48 Generates the DBIC query from the query parameters.
53 'extract_reserved_params' => sub {
54 my ( $c, $params ) = @_;
60 my $reserved_words = _reserved_words();
61 my @query_param_names = keys %{$c->req->params->to_hash};
63 foreach my $param ( keys %{$params} ) {
64 if ( grep { $param eq $_ } @{$reserved_words} ) {
65 $reserved_params->{$param} = $params->{$param};
67 elsif ( grep { $param eq $_ } @query_param_names ) {
68 $filtered_params->{$param} = $params->{$param};
71 $path_params->{$param} = $params->{$param};
75 return ( $filtered_params, $reserved_params, $path_params );
79 =head3 dbic_merge_sorting
81 $attributes = $c->dbic_merge_sorting({ attributes => $attributes, params => $params });
83 Generates the DBIC order_by attributes based on I<$params>, and merges into I<$attributes>.
88 'dbic_merge_sorting' => sub {
89 my ( $c, $args ) = @_;
90 my $attributes = $args->{attributes};
91 my $result_set = $args->{result_set};
93 if ( defined $args->{params}->{_order_by} ) {
94 my $order_by = $args->{params}->{_order_by};
95 $order_by = [ split(/,/, $order_by) ] if ( index(',',$order_by) == -1);
96 if ( reftype($order_by) and reftype($order_by) eq 'ARRAY' ) {
97 my @order_by = map { _build_order_atom({ string => $_, result_set => $result_set }) }
99 $attributes->{order_by} = \@order_by;
102 $attributes->{order_by} = _build_order_atom({ string => $order_by, result_set => $result_set });
110 =head3 dbic_merge_prefetch
112 $attributes = $c->dbic_merge_prefetch({ attributes => $attributes, result_set => $result_set });
114 Generates the DBIC prefetch attribute based on embedded relations, and merges into I<$attributes>.
119 'dbic_merge_prefetch' => sub {
120 my ( $c, $args ) = @_;
121 my $attributes = $args->{attributes};
122 my $result_set = $args->{result_set};
123 my $embed = $c->stash('koha.embed');
125 return unless defined $embed;
128 foreach my $key (sort keys(%{$embed})) {
129 my $parsed = _parse_prefetch($key, $embed, $result_set);
130 push @prefetches, $parsed if defined $parsed;
133 if(scalar(@prefetches)) {
134 $attributes->{prefetch} = \@prefetches;
139 =head3 _build_query_params_from_api
141 my $params = _build_query_params_from_api( $filtered_params, $reserved_params );
143 Builds the params for searching on DBIC based on the selected matching algorithm.
144 Valid options are I<contains>, I<starts_with>, I<ends_with> and I<exact>. Default is
145 I<contains>. If other value is passed, a Koha::Exceptions::WrongParameter exception
151 'build_query_params' => sub {
153 my ( $c, $filtered_params, $reserved_params ) = @_;
156 my $match = $reserved_params->{_match} // 'contains';
158 foreach my $param ( keys %{$filtered_params} ) {
159 if ( $match eq 'contains' ) {
161 { like => '%' . $filtered_params->{$param} . '%' };
163 elsif ( $match eq 'starts_with' ) {
164 $params->{$param} = { like => $filtered_params->{$param} . '%' };
166 elsif ( $match eq 'ends_with' ) {
167 $params->{$param} = { like => '%' . $filtered_params->{$param} };
169 elsif ( $match eq 'exact' ) {
170 $params->{$param} = $filtered_params->{$param};
173 # We should never reach here, because the OpenAPI plugin should
174 # prevent invalid params to be passed
175 Koha::Exceptions::WrongParameter->throw(
176 "Invalid value for _match param ($match)");
184 =head3 merge_q_params
186 $c->merge_q_params( $filtered_params, $q_params, $result_set );
188 Merges parameters from $q_params into $filtered_params.
193 'merge_q_params' => sub {
195 my ( $c, $filtered_params, $q_params, $result_set ) = @_;
197 $q_params = decode_json($q_params) unless reftype $q_params;
199 my $params = _parse_dbic_query($q_params, $result_set);
201 return $params unless scalar(keys %{$filtered_params});
202 return {'-and' => [$params, $filtered_params ]};
208 $c->stash_embed( $c->match->endpoint->pattern->defaults->{'openapi.op_spec'} );
213 'stash_embed' => sub {
215 my ( $c, $args ) = @_;
217 my $spec = $args->{spec} // {};
219 my $embed_spec = $spec->{'x-koha-embed'};
220 my $embed_header = $c->req->headers->header('x-koha-embed');
222 Koha::Exceptions::BadParameter->throw("Embedding objects is not allowed on this endpoint.")
223 if $embed_header and !defined $embed_spec;
225 if ( $embed_header ) {
227 foreach my $embed_req ( split /\s*,\s*/, $embed_header ) {
228 my $matches = grep {lc $_ eq lc $embed_req} @{ $embed_spec };
230 Koha::Exceptions::BadParameter->throw(
231 error => 'Embeding '.$embed_req. ' is not authorised. Check your x-koha-embed headers or remove it.'
234 _merge_embed( _parse_embed($embed_req), $THE_embed);
237 $c->stash( 'koha.embed' => $THE_embed )
246 =head2 Internal methods
248 =head3 _reserved_words
250 my $reserved_words = _reserved_words();
254 sub _reserved_words {
256 my @reserved_words = qw( _match _order_by _page _per_page q query x-koha-query);
257 return \@reserved_words;
260 =head3 _build_order_atom
262 my $order_atom = _build_order_atom( $string );
264 Parses I<$string> and outputs data valid for using in SQL::Abstract order_by attribute
265 according to the following rules:
268 +string -> I<{ -asc => string }>
269 -string -> I<{ -desc => string }>
273 sub _build_order_atom {
275 my $string = $args->{string};
276 my $result_set = $args->{result_set};
279 $param =~ s/^(\+|\-|\s)//;
281 my $model_param = _from_api_param($param, $result_set);
282 $param = $model_param if defined $model_param;
285 if ( $string =~ m/^\+/ or
286 $string =~ m/^\s/ ) {
287 # asc order operator present
288 return { -asc => $param };
290 elsif ( $string =~ m/^\-/ ) {
291 # desc order operator present
292 return { -desc => $param };
295 # no order operator present
302 my $embed = _parse_embed( $string );
304 Parses I<$string> and outputs data valid for passing to the Kohaa::Object(s)->to_api
313 my ( $curr, $next ) = split /\s*\.\s*/, $string, 2;
316 $result->{$curr} = { children => _parse_embed( $next ) };
319 if ( $curr =~ m/^(?<relation>.*)\+count/ ) {
320 my $key = $+{relation} . "_count";
321 $result->{$key} = { is_count => 1 };
324 $result->{$curr} = {};
333 _merge_embed( $parsed_embed, $global_embed );
335 Merges the hash referenced by I<$parsed_embed> into I<$global_embed>.
340 my ( $structure, $embed ) = @_;
342 my ($root) = keys %{ $structure };
344 if ( any { $root eq $_ } keys %{ $embed } ) {
346 _merge_embed( $structure->{$root}, $embed->{$root} );
350 $embed->{$root} = $structure->{$root};
354 sub _parse_prefetch {
355 my ( $key, $embed, $result_set) = @_;
358 $pref_key =~ s/_count$// if $embed->{$key}->{is_count};
359 return unless exists $result_set->prefetch_whitelist->{$pref_key};
361 my $ko_class = $result_set->prefetch_whitelist->{$pref_key};
362 return $pref_key unless defined $embed->{$key}->{children} && defined $ko_class;
365 foreach my $child (sort keys(%{$embed->{$key}->{children}})) {
366 my $parsed = _parse_prefetch($child, $embed->{$key}->{children}, $ko_class->new);
367 push @prefetches, $parsed if defined $parsed;
370 return $pref_key unless scalar(@prefetches);
372 return {$pref_key => $prefetches[0]} if scalar(@prefetches) eq 1;
374 return {$pref_key => \@prefetches};
377 sub _from_api_param {
378 my ($key, $result_set) = @_;
382 my ($curr, $next) = split /\s*\.\s*/, $key, 2;
384 return $curr.'.'._from_api_param($next, $result_set) if $curr eq 'me';
386 my $ko_class = $result_set->prefetch_whitelist->{$curr};
388 Koha::Exceptions::BadParameter->throw("Cannot find Koha::Object class for $curr")
389 unless defined $ko_class;
391 $result_set = $ko_class->new;
394 return _from_api_param($next, $result_set);
396 return $curr.'.'.($result_set->from_api_mapping && defined $result_set->from_api_mapping->{$next} ? $result_set->from_api_mapping->{$next}:$next);
399 return defined $result_set->from_api_mapping->{$key} ? $result_set->from_api_mapping->{$key} : $key;
403 sub _parse_dbic_query {
404 my ($q_params, $result_set) = @_;
406 if(reftype($q_params) && reftype($q_params) eq 'HASH') {
408 foreach my $key (keys %{$q_params}) {
409 if($key =~ /-?(not_?)?bool/i ) {
410 $parsed_hash->{$key} = _from_api_param($q_params->{$key}, $result_set);
413 my $k = _from_api_param($key, $result_set);
414 $parsed_hash->{$k} = _parse_dbic_query($q_params->{$key}, $result_set);
417 } elsif (reftype($q_params) && reftype($q_params) eq 'ARRAY') {
418 my @mapped = map{ _parse_dbic_query($_, $result_set) } @$q_params;