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1 | <?php |
2 | |
3 | /** |
4 | * SRU Search Interface |
5 | * |
6 | * PHP version 8 |
7 | * |
8 | * Copyright (C) Andrew Nagy 2008. |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License version 2, |
12 | * as published by the Free Software Foundation. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
17 | * GNU General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
22 | * |
23 | * @category VuFind |
24 | * @package SRU |
25 | * @author Andrew S. Nagy <vufind-tech@lists.sourceforge.net> |
26 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
27 | * @link https://vufind.org/wiki/development Wiki |
28 | */ |
29 | |
30 | namespace VuFindSearch\Backend\SRU; |
31 | |
32 | use VuFind\XSLT\Processor as XSLTProcessor; |
33 | use VuFindSearch\Backend\Exception\BackendException; |
34 | use VuFindSearch\Backend\Exception\HttpErrorException; |
35 | |
36 | use function is_array; |
37 | |
38 | /** |
39 | * SRU Search Interface |
40 | * |
41 | * @category VuFind |
42 | * @package SRU |
43 | * @author Andrew S. Nagy <vufind-tech@lists.sourceforge.net> |
44 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
45 | * @link https://vufind.org/wiki/development Wiki |
46 | */ |
47 | class Connector implements \Laminas\Log\LoggerAwareInterface |
48 | { |
49 | use \VuFind\Log\LoggerAwareTrait; |
50 | |
51 | /** |
52 | * Whether to Serialize to a PHP Array or not. |
53 | * |
54 | * @var bool |
55 | */ |
56 | protected $raw = false; |
57 | |
58 | /** |
59 | * The HTTP_Request object used for REST transactions |
60 | * |
61 | * @var \Laminas\Http\Client |
62 | */ |
63 | protected $client; |
64 | |
65 | /** |
66 | * The host to connect to |
67 | * |
68 | * @var string |
69 | */ |
70 | protected $host; |
71 | |
72 | /** |
73 | * The version to specify in the URL |
74 | * |
75 | * @var string |
76 | */ |
77 | protected $sruVersion = '1.1'; |
78 | |
79 | /** |
80 | * Constructor |
81 | * |
82 | * Sets up the SOAP Client |
83 | * |
84 | * @param string $host The URL of the SRU Server |
85 | * @param \Laminas\Http\Client $client An HTTP client object |
86 | */ |
87 | public function __construct($host, \Laminas\Http\Client $client) |
88 | { |
89 | // Initialize properties needed for HTTP connection: |
90 | $this->host = $host; |
91 | $this->client = $client; |
92 | } |
93 | |
94 | /** |
95 | * Get records similar to one record |
96 | * |
97 | * @param array $record An associative array of the record data |
98 | * @param string $id The record id |
99 | * @param int $max The maximum records to return; Default is 5 |
100 | * |
101 | * @return array An array of query results |
102 | */ |
103 | public function getMoreLikeThis($record, $id, $max = 5) |
104 | { |
105 | // More Like This Query |
106 | $query = 'title="' . $record['245']['a'] . '" ' . |
107 | "NOT rec.id=$id"; |
108 | |
109 | // Query String Parameters |
110 | $options = ['operation' => 'searchRetrieve', |
111 | 'query' => $query, |
112 | 'maximumRecords' => $max, |
113 | 'startRecord' => 1, |
114 | 'recordSchema' => 'marcxml']; |
115 | |
116 | $this->debug('More Like This Query: ' . $query); |
117 | |
118 | return $this->call('GET', $options); |
119 | } |
120 | |
121 | /** |
122 | * Scan |
123 | * |
124 | * @param string $clause The CQL clause specifying the start point |
125 | * @param int $pos The position of the start point in the response |
126 | * @param int $maxTerms The maximum number of terms to return |
127 | * |
128 | * @return string XML response |
129 | */ |
130 | public function scan($clause, $pos = null, $maxTerms = null) |
131 | { |
132 | $options = ['operation' => 'scan', |
133 | 'scanClause' => $clause]; |
134 | if (null !== $pos) { |
135 | $options['responsePosition'] = $pos; |
136 | } |
137 | if (null !== $maxTerms) { |
138 | $options['maximumTerms'] = $maxTerms; |
139 | } |
140 | |
141 | return $this->call('GET', $options, false); |
142 | } |
143 | |
144 | /** |
145 | * Search |
146 | * |
147 | * @param string $query The search query |
148 | * @param string $start The record to start with |
149 | * @param string $limit The amount of records to return |
150 | * @param string $sortBy The value to be used by for sorting |
151 | * @param string $schema Record schema to use in results list |
152 | * @param bool $process Process into array (true) or return raw (false) |
153 | * |
154 | * @return array An array of query results |
155 | */ |
156 | public function sruSearch( |
157 | $query, |
158 | $start = 1, |
159 | $limit = null, |
160 | $sortBy = null, |
161 | $schema = 'marcxml', |
162 | $process = true |
163 | ) { |
164 | $this->debug('Query: ' . $query); |
165 | |
166 | // Query String Parameters |
167 | $options = ['operation' => 'searchRetrieve', |
168 | 'query' => $query, |
169 | 'startRecord' => ($start) ? $start : 1, |
170 | 'recordSchema' => $schema]; |
171 | if (null !== $limit) { |
172 | $options['maximumRecords'] = $limit; |
173 | } |
174 | if (null !== $sortBy) { |
175 | $options['sortKeys'] = $sortBy; |
176 | } |
177 | |
178 | return $this->call('GET', $options, $process); |
179 | } |
180 | |
181 | /** |
182 | * Check for HTTP errors in a response. |
183 | * |
184 | * @param \Laminas\Http\Response $result The response to check. |
185 | * |
186 | * @throws BackendException |
187 | * @return void |
188 | */ |
189 | public function checkForHttpError($result) |
190 | { |
191 | if (!$result->isSuccess()) { |
192 | throw HttpErrorException::createFromResponse($result); |
193 | } |
194 | } |
195 | |
196 | /** |
197 | * Submit REST Request |
198 | * |
199 | * @param string $method HTTP Method to use: GET or POST |
200 | * @param array $params An array of parameters for the request |
201 | * @param bool $process Should we convert the MARCXML? |
202 | * |
203 | * @return string|SimpleXMLElement The response from the XServer |
204 | */ |
205 | protected function call($method = 'GET', $params = null, $process = true) |
206 | { |
207 | $queryString = ''; |
208 | if ($params) { |
209 | $query = ['version=' . $this->sruVersion]; |
210 | foreach ($params as $function => $value) { |
211 | if (is_array($value)) { |
212 | foreach ($value as $additional) { |
213 | $additional = urlencode($additional); |
214 | $query[] = "$function=$additional"; |
215 | } |
216 | } else { |
217 | $value = urlencode($value); |
218 | $query[] = "$function=$value"; |
219 | } |
220 | } |
221 | $queryString = implode('&', $query); |
222 | } |
223 | |
224 | $url = $this->host . '?' . $queryString; |
225 | $this->debug('Connect: ' . $url); |
226 | |
227 | // Send Request |
228 | $this->client->resetParameters(); |
229 | $this->client->setUri($url); |
230 | $result = $this->client->setMethod($method)->send(); |
231 | $this->checkForHttpError($result); |
232 | |
233 | // Return processed or unprocessed response, as appropriate: |
234 | return $process ? $this->process($result->getBody()) : $result->getBody(); |
235 | } |
236 | |
237 | /** |
238 | * Process an SRU response. Returns either the raw XML string or a |
239 | * SimpleXMLElement based on the contents of the class' raw property. |
240 | * |
241 | * @param string $response SRU response |
242 | * |
243 | * @return string|SimpleXMLElement |
244 | */ |
245 | protected function process($response) |
246 | { |
247 | // Send back either the raw XML or a SimpleXML object, as requested: |
248 | $result = XSLTProcessor::process('sru-convert.xsl', $response); |
249 | if (!$result) { |
250 | throw new BackendException( |
251 | sprintf('Error processing SRU response: %20s', $response) |
252 | ); |
253 | } |
254 | return $this->raw ? $result : simplexml_load_string($result); |
255 | } |
256 | } |