Completed
Push — update/idc-endpoint-migration ( b3b716...4fc7c1 )
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11:31
created

Base_Admin_Menu::set_is_api_request()   A

Complexity

Conditions 3
Paths 3

Size

Total Lines 6

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
cc 3
nc 3
nop 0
dl 0
loc 6
rs 10
c 0
b 0
f 0
1
<?php
2
/**
3
 * Base Admin Menu file.
4
 *
5
 * @package automattic/jetpack
6
 */
7
8
namespace Automattic\Jetpack\Dashboard_Customizations;
9
10
use Automattic\Jetpack\Status;
11
12
/**
13
 * Class Base_Admin_Menu
14
 */
15
abstract class Base_Admin_Menu {
16
	/**
17
	 * Holds class instances.
18
	 *
19
	 * @var array
20
	 */
21
	protected static $instances;
22
23
	/**
24
	 * Whether the current request is a REST API request.
25
	 *
26
	 * @var bool
27
	 */
28
	protected $is_api_request = false;
29
30
	/**
31
	 * Domain of the current site.
32
	 *
33
	 * @var string
34
	 */
35
	protected $domain;
36
37
	/**
38
	 * The CSS classes used to hide the submenu items in navigation.
39
	 *
40
	 * @var string
41
	 */
42
	const HIDE_CSS_CLASS = 'hide-if-js';
43
44
	/**
45
	 * Base_Admin_Menu constructor.
46
	 */
47
	protected function __construct() {
48
		$this->is_api_request = defined( 'REST_REQUEST' ) && REST_REQUEST || 0 === strpos( $_SERVER['REQUEST_URI'], '/?rest_route=%2Fwpcom%2Fv2%2Fadmin-menu' );
49
		$this->domain         = ( new Status() )->get_site_suffix();
50
51
		add_action( 'admin_menu', array( $this, 'reregister_menu_items' ), 99998 );
52
		add_action( 'admin_menu', array( $this, 'hide_parent_of_hidden_submenus' ), 99999 );
53
54
		if ( ! $this->is_api_request ) {
55
			add_filter( 'admin_menu', array( $this, 'override_svg_icons' ), 99999 );
56
			add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_scripts' ), 11 );
57
			add_action( 'admin_head', array( $this, 'set_site_icon_inline_styles' ) );
58
		}
59
	}
60
61
	/**
62
	 * Returns class instance.
63
	 *
64
	 * @return Admin_Menu
65
	 */
66
	public static function get_instance() {
67
		$class = get_called_class();
68
69
		if ( empty( static::$instances[ $class ] ) ) {
70
			static::$instances[ $class ] = new $class();
71
		}
72
73
		return static::$instances[ $class ];
74
	}
75
76
	/**
77
	 * Updates the menu data of the given menu slug.
78
	 *
79
	 * @param string $slug Slug of the menu to update.
80
	 * @param string $url New menu URL.
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Documentation introduced by
Should the type for parameter $url not be string|null?

This check looks for @param annotations where the type inferred by our type inference engine differs from the declared type.

It makes a suggestion as to what type it considers more descriptive.

Most often this is a case of a parameter that can be null in addition to its declared types.

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81
	 * @param string $title New menu title.
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Should the type for parameter $title not be string|null?

This check looks for @param annotations where the type inferred by our type inference engine differs from the declared type.

It makes a suggestion as to what type it considers more descriptive.

Most often this is a case of a parameter that can be null in addition to its declared types.

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82
	 * @param string $cap New menu capability.
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Documentation introduced by
Should the type for parameter $cap not be string|null?

This check looks for @param annotations where the type inferred by our type inference engine differs from the declared type.

It makes a suggestion as to what type it considers more descriptive.

Most often this is a case of a parameter that can be null in addition to its declared types.

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83
	 * @param string $icon New menu icon.
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Documentation introduced by
Should the type for parameter $icon not be string|null?

This check looks for @param annotations where the type inferred by our type inference engine differs from the declared type.

It makes a suggestion as to what type it considers more descriptive.

Most often this is a case of a parameter that can be null in addition to its declared types.

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84
	 * @param int    $position New menu position.
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Documentation introduced by
Should the type for parameter $position not be integer|null?

This check looks for @param annotations where the type inferred by our type inference engine differs from the declared type.

It makes a suggestion as to what type it considers more descriptive.

Most often this is a case of a parameter that can be null in addition to its declared types.

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85
	 * @return bool Whether the menu has been updated.
86
	 */
87
	public function update_menu( $slug, $url = null, $title = null, $cap = null, $icon = null, $position = null ) {
88
		global $menu, $submenu;
89
90
		$menu_item     = null;
91
		$menu_position = null;
92
93
		foreach ( $menu as $i => $item ) {
94
			if ( $slug === $item[2] ) {
95
				$menu_item     = $item;
96
				$menu_position = $i;
97
				break;
98
			}
99
		}
100
101
		if ( ! $menu_item ) {
102
			return false;
103
		}
104
105
		if ( $title ) {
0 ignored issues
show
Bug Best Practice introduced by
The expression $title of type string|null is loosely compared to true; this is ambiguous if the string can be empty. You might want to explicitly use !== null instead.

In PHP, under loose comparison (like ==, or !=, or switch conditions), values of different types might be equal.

For string values, the empty string '' is a special case, in particular the following results might be unexpected:

''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
Loading history...
106
			$menu_item[0] = $title;
107
			$menu_item[3] = esc_attr( $title );
108
		}
109
110
		if ( $cap ) {
0 ignored issues
show
Bug Best Practice introduced by
The expression $cap of type string|null is loosely compared to true; this is ambiguous if the string can be empty. You might want to explicitly use !== null instead.

In PHP, under loose comparison (like ==, or !=, or switch conditions), values of different types might be equal.

For string values, the empty string '' is a special case, in particular the following results might be unexpected:

''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
Loading history...
111
			$menu_item[1] = $cap;
112
		}
113
114
		// Change parent slug only if there are no submenus (the slug of the 1st submenu will be used if there are submenus).
115
		if ( $url ) {
0 ignored issues
show
Bug Best Practice introduced by
The expression $url of type string|null is loosely compared to true; this is ambiguous if the string can be empty. You might want to explicitly use !== null instead.

In PHP, under loose comparison (like ==, or !=, or switch conditions), values of different types might be equal.

For string values, the empty string '' is a special case, in particular the following results might be unexpected:

''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
Loading history...
116
			$this->hide_submenu_page( $slug, $slug );
117
118
			if ( ! isset( $submenu[ $slug ] ) || ! $this->has_visible_items( $submenu[ $slug ] ) ) {
119
				$menu_item[2] = $url;
120
			}
121
		}
122
123
		if ( $icon ) {
0 ignored issues
show
Bug Best Practice introduced by
The expression $icon of type string|null is loosely compared to true; this is ambiguous if the string can be empty. You might want to explicitly use !== null instead.

In PHP, under loose comparison (like ==, or !=, or switch conditions), values of different types might be equal.

For string values, the empty string '' is a special case, in particular the following results might be unexpected:

''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
Loading history...
124
			$menu_item[4] = 'menu-top';
125
			$menu_item[6] = $icon;
126
		}
127
128
		// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
129
		unset( $menu[ $menu_position ] );
130
		if ( $position ) {
0 ignored issues
show
Bug Best Practice introduced by
The expression $position of type integer|null is loosely compared to true; this is ambiguous if the integer can be zero. You might want to explicitly use !== null instead.

In PHP, under loose comparison (like ==, or !=, or switch conditions), values of different types might be equal.

For integer values, zero is a special case, in particular the following results might be unexpected:

0   == false // true
0   == null  // true
123 == false // false
123 == null  // false

// It is often better to use strict comparison
0 === false // false
0 === null  // false
Loading history...
131
			$menu_position = $position;
132
		}
133
		$this->set_menu_item( $menu_item, $menu_position );
134
135
		// Only add submenu when there are other submenu items.
136
		if ( $url && isset( $submenu[ $slug ] ) && $this->has_visible_items( $submenu[ $slug ] ) ) {
0 ignored issues
show
Bug Best Practice introduced by
The expression $url of type string|null is loosely compared to true; this is ambiguous if the string can be empty. You might want to explicitly use !== null instead.

In PHP, under loose comparison (like ==, or !=, or switch conditions), values of different types might be equal.

For string values, the empty string '' is a special case, in particular the following results might be unexpected:

''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
Loading history...
137
			add_submenu_page( $slug, $menu_item[3], $menu_item[0], $menu_item[1], $url, null, 0 );
138
		}
139
140
		return true;
141
	}
142
143
	/**
144
	 * Updates the submenus of the given menu slug.
145
	 *
146
	 * It hides the menu by adding the `hide-if-js` css class and duplicates the submenu with the new slug.
147
	 *
148
	 * @param string $slug Menu slug.
149
	 * @param array  $submenus_to_update Array of new submenu slugs.
150
	 */
151
	public function update_submenus( $slug, $submenus_to_update ) {
152
		global $submenu;
153
154
		if ( ! isset( $submenu[ $slug ] ) ) {
155
			return;
156
		}
157
158
		// This is needed for cases when the submenus to update have the same new slug.
159
		$submenus_to_update = array_filter(
160
			$submenus_to_update,
161
			static function ( $item, $old_slug ) {
162
				return $item !== $old_slug;
163
			},
164
			ARRAY_FILTER_USE_BOTH
165
		);
166
167
		/**
168
		 * Iterate over all submenu items and add the hide the submenus with CSS classes.
169
		 * This is done separately of the second foreach because the position of the submenu might change.
170
		 */
171
		foreach ( $submenu[ $slug ] as $index => $item ) {
172
			if ( ! array_key_exists( $item[2], $submenus_to_update ) ) {
173
				continue;
174
			}
175
176
			$this->hide_submenu_element( $index, $slug, $item );
177
		}
178
179
		$submenu_items = array_values( $submenu[ $slug ] );
180
181
		/**
182
		 * Iterate again over the submenu array. We need a copy of the array because add_submenu_page will add new elements
183
		 * to submenu array that might cause an infinite loop.
184
		 */
185
		foreach ( $submenu_items as $i => $submenu_item ) {
186
			if ( ! array_key_exists( $submenu_item[2], $submenus_to_update ) ) {
187
				continue;
188
			}
189
190
			add_submenu_page(
191
				$slug,
192
				isset( $submenu_item[3] ) ? $submenu_item[3] : '',
193
				isset( $submenu_item[0] ) ? $submenu_item[0] : '',
194
				isset( $submenu_item[1] ) ? $submenu_item[1] : 'read',
195
				$submenus_to_update[ $submenu_item[2] ],
196
				'',
197
				$i
198
			);
199
		}
200
	}
201
202
	/**
203
	 * Adds a menu separator.
204
	 *
205
	 * @param int    $position The position in the menu order this item should appear.
0 ignored issues
show
Documentation introduced by
Should the type for parameter $position not be integer|null?

This check looks for @param annotations where the type inferred by our type inference engine differs from the declared type.

It makes a suggestion as to what type it considers more descriptive.

Most often this is a case of a parameter that can be null in addition to its declared types.

Loading history...
206
	 * @param string $cap Optional. The capability required for this menu to be displayed to the user.
207
	 *                         Default: 'read'.
208
	 */
209
	public function add_admin_menu_separator( $position = null, $cap = 'read' ) {
210
		$menu_item = array(
211
			'',                                  // Menu title (ignored).
212
			$cap,                                // Required capability.
213
			wp_unique_id( 'separator-custom-' ), // URL or file (ignored, but must be unique).
214
			'',                                  // Page title (ignored).
215
			'wp-menu-separator',                 // CSS class. Identifies this item as a separator.
216
		);
217
218
		$this->set_menu_item( $menu_item, $position );
219
	}
220
221
	/**
222
	 * Enqueues scripts and styles.
223
	 */
224
	public function enqueue_scripts() {
225
		$is_wpcom = defined( 'IS_WPCOM' ) && IS_WPCOM;
226
227
		if ( $this->is_rtl() ) {
228
			if ( $is_wpcom ) {
229
				$css_path = 'rtl/admin-menu-rtl.css';
230
			} else {
231
				$css_path = 'admin-menu-rtl.css';
232
			}
233
		} else {
234
			$css_path = 'admin-menu.css';
235
		}
236
237
		wp_enqueue_style(
238
			'jetpack-admin-menu',
239
			plugins_url( $css_path, __FILE__ ),
240
			array(),
241
			JETPACK__VERSION
242
		);
243
244
		wp_style_add_data( 'jetpack-admin-menu', 'rtl', $this->is_rtl() );
245
		$this->configure_colors_for_rtl_stylesheets();
246
247
		wp_enqueue_script(
248
			'jetpack-admin-menu',
249
			plugins_url( 'admin-menu.js', __FILE__ ),
250
			array(),
251
			JETPACK__VERSION,
252
			true
253
		);
254
	}
255
256
	/**
257
	 * Mark the core colors stylesheets as RTL depending on the value from the environment.
258
	 * This fixes a core issue where the extra RTL data is not added to the colors stylesheet.
259
	 * https://core.trac.wordpress.org/ticket/53090
260
	 */
261
	public function configure_colors_for_rtl_stylesheets() {
262
		wp_style_add_data( 'colors', 'rtl', $this->is_rtl() );
263
	}
264
265
	/**
266
	 * Injects inline-styles for site icon for when third-party plugins remove enqueued stylesheets.
267
	 * Unable to use wp_add_inline_style as plugins remove styles from all non-standard handles
268
	 */
269
	public function set_site_icon_inline_styles() {
270
		echo '<style>
271
			#adminmenu .toplevel_page_site-card .wp-menu-image,
272
			#adminmenu .toplevel_page_site-card .wp-menu-image img {
273
				height: 32px;
274
				width: 32px;
275
			}
276
		</style>';
277
	}
278
279
	/**
280
	 * Hide the submenu page based on slug and return the item that was hidden.
281
	 *
282
	 * Instead of actually removing the submenu item, a safer approach is to hide it and filter it in the API response.
283
	 * In this manner we'll avoid breaking third-party plugins depending on items that no longer exist.
284
	 *
285
	 * A false|array value is returned to be consistent with remove_submenu_page() function
286
	 *
287
	 * @param string $menu_slug The parent menu slug.
288
	 * @param string $submenu_slug The submenu slug that should be hidden.
289
	 * @return false|array
290
	 */
291
	public function hide_submenu_page( $menu_slug, $submenu_slug ) {
292
		global $submenu;
293
294
		if ( ! isset( $submenu[ $menu_slug ] ) ) {
295
			return false;
296
		}
297
298
		foreach ( $submenu[ $menu_slug ] as $i => $item ) {
299
			if ( $submenu_slug !== $item[2] ) {
300
				continue;
301
			}
302
303
			$this->hide_submenu_element( $i, $menu_slug, $item );
304
305
			return $item;
306
		}
307
308
		return false;
309
	}
310
311
	/**
312
	 * Apply the hide-if-js CSS class to a submenu item.
313
	 *
314
	 * @param int    $index The position of a submenu item in the submenu array.
315
	 * @param string $parent_slug The parent slug.
316
	 * @param array  $item The submenu item.
317
	 */
318
	public function hide_submenu_element( $index, $parent_slug, $item ) {
319
		global $submenu;
320
321
		$css_classes = empty( $item[4] ) ? self::HIDE_CSS_CLASS : $item[4] . ' ' . self::HIDE_CSS_CLASS;
322
323
		// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
324
		$submenu [ $parent_slug ][ $index ][4] = $css_classes;
325
	}
326
327
	/**
328
	 * Check if the menu has submenu items visible
329
	 *
330
	 * @param array $submenu_items The submenu items.
331
	 * @return bool
332
	 */
333
	public function has_visible_items( $submenu_items ) {
334
		$visible_items = array_filter(
335
			$submenu_items,
336
			array( $this, 'is_item_visible' )
337
		);
338
339
		return array() !== $visible_items;
340
	}
341
342
	/**
343
	 * Return the number of existing submenu items under the supplied parent slug.
344
	 *
345
	 * @param string $parent_slug The slug of the parent menu.
346
	 * @return int The number of submenu items under $parent_slug.
347
	 */
348
	public function get_submenu_item_count( $parent_slug ) {
349
		global $submenu;
350
351
		if ( empty( $parent_slug ) || empty( $submenu[ $parent_slug ] ) || ! is_array( $submenu[ $parent_slug ] ) ) {
352
			return 0;
353
		}
354
355
		return count( $submenu[ $parent_slug ] );
356
	}
357
358
	/**
359
	 * Adds the given menu item in the specified position.
360
	 *
361
	 * @param array $item The menu item to add.
362
	 * @param int   $position The position in the menu order this item should appear.
0 ignored issues
show
Documentation introduced by
Should the type for parameter $position not be integer|null?

This check looks for @param annotations where the type inferred by our type inference engine differs from the declared type.

It makes a suggestion as to what type it considers more descriptive.

Most often this is a case of a parameter that can be null in addition to its declared types.

Loading history...
363
	 */
364
	public function set_menu_item( $item, $position = null ) {
365
		global $menu;
366
367
		// Handle position (avoids overwriting menu items already populated in the given position).
368
		// Inspired by https://core.trac.wordpress.org/browser/trunk/src/wp-admin/menu.php?rev=49837#L160.
369
		if ( null === $position ) {
370
			$menu[] = $item; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
371
		} elseif ( isset( $menu[ "$position" ] ) ) {
372
			$position            = $position + substr( base_convert( md5( $item[2] . $item[0] ), 16, 10 ), -5 ) * 0.00001;
373
			$menu[ "$position" ] = $item; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
374
		} else {
375
			$menu[ $position ] = $item; // phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
376
		}
377
	}
378
379
	/**
380
	 * Determines whether the current locale is right-to-left (RTL).
381
	 */
382
	public function is_rtl() {
383
		return is_rtl();
384
	}
385
386
	/**
387
	 * Checks for any SVG icons in the menu, and overrides things so that
388
	 * we can display the icon in the correct colour for the theme.
389
	 */
390
	public function override_svg_icons() {
391
		global $menu;
392
393
		$svg_items = array();
394
		foreach ( $menu as $idx => $menu_item ) {
395
			// Menu items that don't have icons, for example separators, have less than 7
396
			// elements, partly because the 7th is the icon. So, if we have less than 7,
397
			// let's skip it.
398
			if ( count( $menu_item ) < 7 ) {
399
				continue;
400
			}
401
402
			// If the hookname contain a URL than sanitize it by replacing invalid characters.
403
			if ( false !== strpos( $menu_item[5], '://' ) ) {
404
				$menu_item[5] = preg_replace( '![:/.]+!', '_', $menu_item[5] );
405
			}
406
407
			if ( 0 === strpos( $menu_item[6], 'data:image/svg+xml' ) && 'site-card' !== $menu_item[3] ) {
408
				$svg_items[]   = array(
409
					'icon' => $menu_item[6],
410
					'id'   => $menu_item[5],
411
				);
412
				$menu_item[4] .= ' menu-svg-icon';
413
				$menu_item[6]  = 'none';
414
			}
415
			// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
416
			$menu[ $idx ] = $menu_item;
417
		}
418
		if ( count( $svg_items ) > 0 ) {
419
			$styles = '.menu-svg-icon .wp-menu-image { background-repeat: no-repeat; background-position: center center } ';
420
			foreach ( $svg_items as $svg_item ) {
421
				$styles .= sprintf( '#%s .wp-menu-image { background-image: url( "%s" ) }', $svg_item['id'], $svg_item['icon'] );
422
			}
423
			$styles .= '@supports ( mask-image: none ) or ( -webkit-mask-image: none ) { ';
424
			$styles .= '.menu-svg-icon .wp-menu-image { background-image: none; } ';
425
			$styles .= '.menu-svg-icon .wp-menu-image::before { background-color: currentColor; ';
426
			$styles .= 'mask-size: contain; mask-position: center center; mask-repeat: no-repeat; ';
427
			$styles .= '-webkit-mask-size: contain; -webkit-mask-position: center center; -webkit-mask-repeat: no-repeat; content:"" } ';
428
			foreach ( $svg_items as $svg_item ) {
429
				$styles .= sprintf(
430
					'#%s .wp-menu-image { background-image: none; } #%s .wp-menu-image::before{ mask-image: url( "%s" ); -webkit-mask-image: url( "%s" ) }',
431
					$svg_item['id'],
432
					$svg_item['id'],
433
					$svg_item['icon'],
434
					$svg_item['icon']
435
				);
436
			}
437
			$styles .= '}';
438
439
			wp_register_style( 'svg-menu-overrides', false, array(), '20210331' );
440
			wp_enqueue_style( 'svg-menu-overrides' );
441
			wp_add_inline_style( 'svg-menu-overrides', $styles );
442
		}
443
	}
444
445
	/**
446
	 * Hide menus that are unauthorized and don't have visible submenus and cases when the menu has the same slug
447
	 * as the first submenu item.
448
	 *
449
	 * This must be done at the end of menu and submenu manipulation in order to avoid performing this check each time
450
	 * the submenus are altered.
451
	 */
452
	public function hide_parent_of_hidden_submenus() {
453
		global $menu, $submenu;
454
455
		$this->sort_hidden_submenus();
456
457
		foreach ( $menu as $menu_index => $menu_item ) {
458
			$has_submenus = isset( $submenu[ $menu_item[2] ] );
459
460
			// Skip if the menu doesn't have submenus.
461
			if ( ! $has_submenus ) {
462
				continue;
463
			}
464
465
			// If the first submenu item is hidden then we should also hide the parent.
466
			// Since the submenus are ordered by self::HIDE_CSS_CLASS (hidden submenus should be at the end of the array),
467
			// we can say that if the first submenu is hidden then we should also hide the menu.
468
			$first_submenu_item       = array_values( $submenu[ $menu_item[2] ] )[0];
469
			$is_first_submenu_visible = $this->is_item_visible( $first_submenu_item );
470
471
			// if the user does not have access to the menu and the first submenu is hidden, then hide the menu.
472
			if ( ! current_user_can( $menu_item[1] ) && ! $is_first_submenu_visible ) {
473
				// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
474
				$menu[ $menu_index ][4] = self::HIDE_CSS_CLASS;
475
			}
476
477
			// if the menu has the same slug as the first submenu then hide the submenu.
478
			if ( $menu_item[2] === $first_submenu_item[2] && ! $is_first_submenu_visible ) {
479
				// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
480
				$menu[ $menu_index ][4] = self::HIDE_CSS_CLASS;
481
			}
482
		}
483
	}
484
485
	/**
486
	 * Sort the hidden submenus by moving them at the end of the array in order to avoid WP using them as default URLs.
487
	 *
488
	 * This operation has to be done at the end of submenu manipulation in order to guarantee that the hidden submenus
489
	 * are at the end of the array.
490
	 */
491
	public function sort_hidden_submenus() {
492
		global $submenu;
493
494
		foreach ( $submenu as $menu_slug => $submenu_items ) {
495
			foreach ( $submenu_items as $submenu_index => $submenu_item ) {
496
				if ( $this->is_item_visible( $submenu_item ) ) {
497
					continue;
498
				}
499
500
				unset( $submenu[ $menu_slug ][ $submenu_index ] );
501
				// phpcs:ignore WordPress.WP.GlobalVariablesOverride.Prohibited
502
				$submenu[ $menu_slug ][] = $submenu_item;
503
			}
504
		}
505
	}
506
507
	/**
508
	 * Check if the given item is visible or not in the admin menu.
509
	 *
510
	 * @param array $item A menu or submenu array.
511
	 */
512
	public function is_item_visible( $item ) {
513
		return ! isset( $item[4] ) || false === strpos( $item[4], self::HIDE_CSS_CLASS );
514
	}
515
516
	/**
517
	 * Whether to use wp-admin pages rather than Calypso.
518
	 *
519
	 * Options:
520
	 * false - Calypso (Default).
521
	 * true  - wp-admin.
522
	 *
523
	 * @return bool
524
	 */
525
	abstract public function should_link_to_wp_admin();
526
527
	/**
528
	 * Create the desired menu output.
529
	 */
530
	abstract public function reregister_menu_items();
531
}
532