aboutsummaryrefslogtreecommitdiff
path: root/engine/lib/widgets.php
blob: 53b4a33094a59ca9ca96086b39f69faff5b8dec9 (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
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
<?php
/**
 * Elgg widgets library.
 * Contains code for handling widgets.
 *
 * @package Elgg.Core
 * @subpackage Widgets
 */

/**
 * Get widgets for a particular context
 *
 * The widgets are ordered for display and grouped in columns.
 * $widgets = elgg_get_widgets(elgg_get_logged_in_user_guid(), 'dashboard');
 * $first_column_widgets = $widgets[1];
 *
 * @param int    $user_guid The owner user GUID
 * @param string $context   The context (profile, dashboard, etc)
 *
 * @return array An 2D array of ElggWidget objects
 * @since 1.8.0
 */
function elgg_get_widgets($user_guid, $context) {
	$options = array(
		'type' => 'object',
		'subtype' => 'widget',
		'owner_guid' => $user_guid,
		'private_setting_name' => 'context',
		'private_setting_value' => $context,
		'limit' => 0
	);
	$widgets = elgg_get_entities_from_private_settings($options);
	if (!$widgets) {
		return array();
	}

	$sorted_widgets = array();
	foreach ($widgets as $widget) {
		if (!isset($sorted_widgets[(int)$widget->column])) {
			$sorted_widgets[(int)$widget->column] = array();
		}
		$sorted_widgets[(int)$widget->column][$widget->order] = $widget;
	}

	foreach ($sorted_widgets as $col => $widgets) {
		ksort($sorted_widgets[$col]);
	}

	return $sorted_widgets;
}

/**
 * Create a new widget instance
 *
 * @param int    $entity_guid GUID of entity that owns this widget
 * @param string $handler     The handler for this widget
 * @param int    $access_id   If not specified, it is set to the default access level
 *
 * @return int|false Widget GUID or false on failure
 * @since 1.8.0
 */
function elgg_create_widget($owner_guid, $handler, $context, $access_id = null) {
	if (empty($owner_guid) || empty($handler) || !elgg_is_widget_type($handler)) {
		return false;
	}

	$owner = get_entity($owner_guid);
	if (!$owner) {
		return false;
	}

	$widget = new ElggWidget;
	$widget->owner_guid = $owner_guid;
	$widget->container_guid = $owner_guid; // @todo - will this work for group widgets
	if (isset($access_id)) {
		$widget->access_id = $access_id;
	} else {
		$widget->access_id = get_default_access();
	}

	if (!$widget->save()) {
		return false;
	}

	// private settings cannot be set until ElggWidget saved
	$widget->handler = $handler;
	$widget->context = $context;

	return $widget->getGUID();
}

/**
 * Can the user edit the widget layout
 *
 * Triggers a 'permissions_check', 'widget_layout' plugin hook
 *
 * @param string $context   The widget context
 * @param int    $user_guid The GUID of the user (0 for logged in user)
 *
 * @return bool
 * @since 1.8.0
 */
function elgg_can_edit_widget_layout($context, $user_guid = 0) {

	$user = get_entity((int)$user_guid);
	if (!$user) {
		$user = elgg_get_logged_in_user_entity();
	}

	$return = false;
	if (elgg_is_admin_logged_in()) {
		$return = true;
	}
	if (elgg_get_page_owner_guid() == $user->guid) {
		$return = true;
	}

	$params = array(
		'user' => $user,
		'context' => $context,
		'page_owner' => elgg_get_page_owner_entity()
	);
	return elgg_trigger_plugin_hook('permissions_check', 'widget_layout', $params, $return);
}

/**
 * Regsiter a widget type
 *
 * This should be called by plugins in their init function.
 *
 * @param string $handler     The identifier for the widget handler
 * @param string $name        The name of the widget type
 * @param string $description A description for the widget type
 * @param string $context     A comma-separated list of contexts where this
 *                            widget is allowed (default: 'all')
 * @param bool   $multiple    Whether or not multiple instances of this widget
 *                            are allowed in a single layout (default: false)
 *
 * @return bool
 * @since 1.8.0
 */
function elgg_register_widget_type($handler, $name, $description, $context = "all", $multiple = false) {

	if (!$handler || !$name) {
		return false;
	}

	global $CONFIG;

	if (!isset($CONFIG->widgets)) {
		$CONFIG->widgets = new stdClass;
	}
	if (!isset($CONFIG->widgets->handlers)) {
		$CONFIG->widgets->handlers = array();
	}

	$handlerobj = new stdClass;
	$handlerobj->name = $name;
	$handlerobj->description = $description;
	$handlerobj->context = explode(",", $context);
	$handlerobj->multiple = $multiple;

	$CONFIG->widgets->handlers[$handler] = $handlerobj;

	return true;
}

/**
 * Remove a widget type
 *
 * @param string $handler The identifier for the widget
 *
 * @return void
 * @since 1.8.0
 */
function elgg_unregister_widget_type($handler) {
	global $CONFIG;

	if (!isset($CONFIG->widgets)) {
		return;
	}

	if (!isset($CONFIG->widgets->handlers)) {
		return;
	}

	if (isset($CONFIG->widgets->handlers[$handler])) {
		unset($CONFIG->widgets->handlers[$handler]);
	}
}

/**
 * Has a widget type with the specified handler been registered
 *
 * @param string $handler The widget handler identifying string
 *
 * @return bool Whether or not that widget type exists
 * @since 1.8.0
 */
function elgg_is_widget_type($handler) {
	global $CONFIG;

	if (!empty($CONFIG->widgets) &&
		!empty($CONFIG->widgets->handlers) &&
		is_array($CONFIG->widgets->handlers) &&
		array_key_exists($handler, $CONFIG->widgets->handlers)) {

		return true;
	}

	return false;
}

/**
 * Get the widget types for a context
 *
 * The widget types are stdClass objects.
 *
 * @param string $context The widget context or empty string for current context
 * @param bool   $exact   Only return widgets registered for this context (false)
 *
 * @return array
 * @since 1.8.0
 */
function elgg_get_widget_types($context = "", $exact = false) {
	global $CONFIG;

	if (empty($CONFIG->widgets) ||
		empty($CONFIG->widgets->handlers) ||
		!is_array($CONFIG->widgets->handlers)) {
		// no widgets
		return array();
	}

	if (!$context) {
		$context = elgg_get_context();
	}

	$widgets = array();
	foreach ($CONFIG->widgets->handlers as $key => $handler) {
		if ($exact) {
			if (in_array($context, $handler->context)) {
				$widgets[$key] = $handler;
			}
		} else {
			if (in_array('all', $handler->context) || in_array($context, $handler->context)) {
				$widgets[$key] = $handler;
			}
		}
	}

	return $widgets;
}

/**
 * Regsiter entity of object, widget as ElggWidget objects
 *
 * @return void
 */
function elgg_widget_run_once() {
	add_subtype("object", "widget", "ElggWidget");
}

/**
 * Function to initialize widgets functionality
 *
 * @return void
 */
function elgg_widgets_init() {
	elgg_register_action('widgets/save');
	elgg_register_action('widgets/add');
	elgg_register_action('widgets/move');
	elgg_register_action('widgets/delete');

	run_function_once("elgg_widget_run_once");
}

/**
 * Gets a list of events to create default widgets for and
 * register menu items for default widgets with the admin section.
 *
 * @return void
 */
function elgg_default_widgets_init() {
	global $CONFIG;
	$default_widgets = elgg_trigger_plugin_hook('get_list', 'default_widgets', null, array());

	$CONFIG->default_widget_info = $default_widgets;

	if ($default_widgets) {
		elgg_register_admin_menu_item('default_widgets', 'appearance', 30);

		// override permissions for creating widget on logged out / just created entities
		elgg_register_plugin_hook_handler('container_permissions_check', 'object', 'elgg_default_widgets_permissions_override');

		foreach ($default_widgets as $info) {
			elgg_register_event_handler($info['event'], $info['entity_type'], 'elgg_default_widgets_hook');
		}
	}
}

/**
 * Checks for plugins who have registered default widgets and
 * hooks into events to save.
 *
 * @param string $event  The event
 * @param string $type   The type of object
 * @param object $object The object
 * @return null
 */
function elgg_default_widgets_hook($event, $type, $object) {
	$default_widget_info = elgg_get_config('default_widget_info');

	if (!$default_widget_info) {
		return null;
	}

	$subtype = $object->getSubtype();

	// event is already guaranteed by the hook registration.
	// need to check subtype and type.
	foreach ($default_widget_info as $temp) {
		if ($temp['entity_type'] == $type && $temp['entity_subtype'] == $subtype) {
			$info = $temp;
			break;
		}
	}

	// need to be able to access everything
	$old_ia = elgg_get_ignore_access(true);
	elgg_push_context('create_default_widgets');

	// pull in by widget context with widget owners as the site
	// not using elgg_get_widgets() because it sorts by columns and we don't care right now.
	$options = array(
		'type' => 'object',
		'subtype' => 'widget',
		'owner_guid' => elgg_get_site_entity()->guid,
		'private_setting_name' => 'context',
		'private_setting_value' => $info['context'],
		'limit' => 0
	);

	$widgets = elgg_get_entities_from_private_settings($options);

	foreach ($widgets as $widget) {
		// change the container and owner
		$new_widget = clone $widget;
		$new_widget->container_guid = $object->guid;
		$new_widget->owner_guid = $object->guid;

		// pull in settings
		$settings = get_all_private_settings($widget->guid);

		foreach ($settings as $name => $value) {
			$new_widget->$name = $value;
		}

		$new_widget->save();
	}

	elgg_get_ignore_access($old_ia);
	elgg_pop_context();

	// failure here shouldn't stop the event.
	return null;
}

/**
 * Overrides permissions checks when creating widgets for logged out users.
 *
 * @param string $hook   The permissions hook.
 * @param string $type   The type of entity being created.
 * @param string $return Value
 * @param mixed  $params Params
 * @return true|null
 */
function elgg_default_widgets_permissions_override($hook, $type, $return, $params) {
	if ($type == 'object' && $params['subtype'] == 'widget') {
		return elgg_in_context('create_default_widgets') ? true : null;
	}

	return null;
}

elgg_register_event_handler('init', 'system', 'elgg_widgets_init');
// register default widget hooks from plugins
elgg_register_event_handler('ready', 'system', 'elgg_default_widgets_init');