aboutsummaryrefslogtreecommitdiff
path: root/engine/lib/metadata.php
blob: 0a82ec4dd6a129e32ac6c42b90ed469acb7dd4eb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
<?php
	/**
	 * Elgg metadata
	 * Functions to manage object metadata.
	 * 
	 * @package Elgg
	 * @subpackage Core
	 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
	 * @author Marcus Povey <marcus@dushka.co.uk>
	 * @copyright Curverider Ltd 2008
	 * @link http://elgg.org/
	 */

	/**
	 * @class ElggMetadata
	 * @author Marcus Povey <marcus@dushka.co.uk>
	 */
	class ElggMetadata
	{
		/**
		 * This contains the site's main properties (id, etc)
		 * @var array
		 */
		private $attributes;
		
		/**
		 * Construct a new site object, optionally from a given id value or row.
		 *
		 * @param mixed $id
		 */
		function __construct($id = null) 
		{
			$this->attributes = array();
			
			if (!empty($id)) {
				
				if ($id instanceof stdClass)
					$metadata = $id; // Create from db row
				else
					$metadata = get_metadata($id);	
				
				if ($metadata) {
					$objarray = (array) $metadata;
					foreach($objarray as $key => $value) {
						$this->attributes[$key] = $value;
					}
				}
			}
		}
		
		function __get($name) {
			if (isset($this->attributes[$name])) {
				
				// Sanitise value if necessary
				if ($name=='value')
				{
					switch ($this->attributes['value_type'])
					{
						case 'integer' :  return (int)$this->attributes['value'];
						case 'tag' :
						case 'text' :
						case 'file' : return sanitise_string($this->attributes['value']);
							
						default : throw new InstallationException("Type {$this->attributes['value_type']} is not supported. This indicates an error in your installation, most likely caused by an incomplete upgrade.");
					}
				}
				
				return $this->attributes[$name];
			}
			return null;
		}
		
		function __set($name, $value) {
			$this->attributes[$name] = $value;
			return true;
		}	
		
		/**
		 * Return the owner of this metadata.
		 *
		 * @return mixed
		 */
		function getOwner() { return get_user($this->owner_id); }		
		
		function save()
		{
			if ($this->id > 0)
				return update_metadata($this->id, $this->name, $this->value, $this->value_type, $this->owner_id, $this->access_id);
			else
			{ 
				$this->id = create_metadata($this->object_id, $this->object_type, $this->name, $this->value, $this->value_type, $this->owner_id, $this->access_id);
				if (!$this->id) throw new IOException("Unable to save new ElggAnnotation");
				return $this->id;
			}
			
		}
		
		/**
		 * Delete a given site.
		 */
		function delete() { return delete_metadata($this->id); }
		
	}
	
	/**
	 * Convert a database row to a new ElggMetadata
	 *
	 * @param stdClass $row
	 * @return stdClass or ElggMetadata
	 */
	function row_to_elggmetadata($row) 
	{
		if (!($row instanceof stdClass))
			return $row;
			
		return new ElggMetadata($row);
	}
	
	/**
	 * Detect the value_type for a given value.
	 * Currently this is very crude.
	 * 
	 * TODO: Make better!
	 *
	 * @param mixed $value
	 * @param string $value_type If specified, overrides the detection.
	 * @return string
	 */
	function detect_metadata_valuetype($value, $value_type = "")
	{
		if ($value_type!="")
			return $value_type;
			
		// This is crude
		if (is_int($value)) return 'integer';
		
		return 'tag';
	}
		
	/**
	 * Create a new metadata object, or update an existing one.
	 *
	 * @param int $object_id
	 * @param string $object_type
	 * @param string $name
	 * @param string $value
	 * @param string $value_type
	 * @param int $owner_id
	 * @param int $access_id
	 */
	function create_metadata($object_id, $object_type, $name, $value, $value_type, $owner_id, $access_id = 0)
	{
		global $CONFIG;

		$object_id = (int)$object_id;
		$object_type = sanitise_string(trim($object_type));
		$name = sanitise_string(trim($name));
		$value = sanitise_string(trim($value));
		$value_type = detect_metadata_valuetype(sanitise_string(trim($value_type)));
		$time = time();
		
		$owner_id = (int)$owner_id;
		if ($owner_id==0) $owner_id = $_SESSION['id'];
		
		$access_id = (int)$access_id;

		$id = false;
		
		$existing = get_data_row("SELECT * from {$CONFIG->dbprefix}metadata WHERE object_id = $object_id and object_type='$object_type' and name='$name' limit 1");
		if ($existing) 
		{
			$id = $existing->id;
			$result = update_metadata($id,$name, $value, $value_type, $owner_id, $access_id);
			
			if (!$result) return false;
		}
		else
		{
			// Add the metastring
			$value = add_metastring($value);
			if (!$value) return false;
			
			// If ok then add it
			$id = insert_data("INSERT into {$CONFIG->dbprefix}metadata (object_id, object_type, name, value, value_type, owner_id, created, access_id) VALUES ($object_id,'$object_type','$name','$value','$value_type', $owner_id, $time, $access_id)");
		}
		
		return $id;
	}
	
	/**
	 * Update an item of metadata.
	 *
	 * @param int $id
	 * @param string $name
	 * @param string $value
	 * @param string $value_type
	 * @param int $owner_id
	 * @param int $access_id
	 */
	function update_metadata($id, $name, $value, $value_type, $owner_id, $access_id)
	{
		global $CONFIG;

		$id = (int)$id;
		$name = sanitise_string(trim($name));
		$value = sanitise_string(trim($value));
		$value_type = detect_metadata_valuetype(sanitise_string(trim($value_type)));
		
		$owner_id = (int)$owner_id;
		if ($owner_id==0) $owner_id = $_SESSION['id'];
		
		$access_id = (int)$access_id;
		
		$access = get_access_list();
		
		
		// Add the metastring
		$value = add_metastring($value);
		if (!$value) return false;
		
		// If ok then add it
		return update_data("UPDATE {$CONFIG->dbprefix}metadata set value='$value', value_type='$value_type', access_id=$access_id, owner_id=$owner_id where id=$id and name='$name' and (access_id in {$access} or (access_id = 0 and owner_id = {$_SESSION['id']}))");
	}

	/**
	 * Get a specific item of metadata.
	 * 
	 * @param $id int The item of metadata being retrieved.
	 */
	function get_metadata($id)
	{
		global $CONFIG;

		$id = (int)$id;
		$access = get_access_list();
				
		return row_to_elggmetadata(get_data_row("SELECT * from {$CONFIG->dbprefix}metadata where id=$id and (access_id in {$access} or (access_id = 0 and owner_id = {$_SESSION['id']}))"));
	}

	/**
	 * Get a list of metadatas for a given object/user/metadata type.
	 *
	 * @param int $object_id
	 * @param string $object_type
	 * @param int $owner_id
	 * @param string $order_by
	 * @param int $limit
	 * @param int $offset
	 * @return array of ElggMetadata
	 */
	function get_metadatas($object_id = 0, $object_type = "", $name = "", $value = "", $value_type = "", $owner_id = 0, $object_subtype = "", $order_by = "created desc", $limit = 10, $offset = 0)
	{
		global $CONFIG;
		
		$object_id = (int)$object_id;
		$object_type = sanitise_string(trim($object_type));
		$name = sanitise_string(trim($name));
		$value = sanitise_string(trim($value));
		$value_type = sanitise_string(trim($value_type));
		$object_subtype = get_object_type_id($object_subtype);
		$owner_id = (int)$owner_id;
		$order_by = sanitise_string($order_by);
		
		$limit = (int)$limit;
		$offset = (int)$offset;
		
		// Construct query
		$where = array();
		
		if ($object_id != 0)
			$where[] = "object_id=$object_id";
			
		if ($object_type != "")
			$where[] = "object_type='$object_type'";
		
		if ($owner_id != 0)
			$where[] = "owner_id=$owner_id";
			
		if ($name != "")
			$where[] = "name='$name'";
			
		if ($value != "")
			$where[] = "value='$value'";
			
		if ($value_type != "")
			$where[] = "value_type='$value_type'";
			
		// add access controls
		$access = get_access_list();
		$where[] = "(access_id in {$access} or (access_id = 0 and owner_id = {$_SESSION['id']}))";
		
		if ($object_subtype!="")
			$where[] = "";
			
		// construct query.
		$query = "SELECT * from {$CONFIG->dbprefix}metadata where ";
		for ($n = 0; $n < count($where); $n++)
		{
			if ($n > 0) $query .= " and ";
			$query .= $where[$n];
		}
		$query .= " order by $order_by limit $offset,$limit";
		
		return get_data($query, "row_to_elggmetadata");
	}

	/**
	 * Similar to get_metadatas, but instead returns the objects associated with a given meta search.
	 * 
	 * @param int $object_id
	 * @param string $object_type
	 * @param int $owner_id
	 * @param string $order_by
	 * @param int $limit
	 * @param int $offset
	 * @return mixed Array of objects or false.
	 */
	function get_objects_from_metadatas($object_id = 0, $object_type = "", $name = "", $value = "", $value_type = "", $owner_id = 0, $object_subtype = "", $order_by = "created desc", $limit = 10, $offset = 0)
	{
		$results = get_metadatas($object_id, $object_type, $name, $value, $value_type, $owner_id, $object_subtype, $order_by, $limit, $offset);
		$objects = false;
		
		if ($results)
		{
			$objects = array();
			
			foreach ($results as $r)
			{
				
				switch ($r->object_type)
				{
					case 'object' : $objects[] = new ElggObject((int)$r->object_id); break;
					case 'user' : $objects[] = new ElggUser((int)$r->object_id); break;
					case 'collection' : $objects[] = new ElggCollection((int)$r->object_id); break;
					case 'site' : $objects[] = new ElggSite((int)$r->object_id); break;
					default: default : throw new InstallationException("Type {$r->object_type} is not supported. This indicates an error in your installation, most likely caused by an incomplete upgrade.");
				}
			}
		}
		
		return $objects;
	}
	
	/**
	 * Delete an item of metadata, where the current user has access.
	 * 
	 * @param $id int The item of metadata to delete.
	 */
	function delete_metadata($id)
	{
		global $CONFIG;

		$id = (int)$id;
		$access = get_access_list();
				
		return delete_data("DELETE from {$CONFIG->dbprefix}metadata where id=$id and (access_id in {$access} or (access_id = 0 and owner_id = {$_SESSION['id']}))");
		
	}
?>