aboutsummaryrefslogtreecommitdiffstats
path: root/include/permissions.php
blob: a3ec13925c65e31958c4c7d614b21fc8b39d8d32 (plain) (blame)
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
389
390
391
392
393
394
395
396
397
398
<?php /** @file */


function get_perms() {

// thinking about making element[2] a bitmask instead of boolean so that we can provide a list of applicable selections
// for any given permission. Currently we use the boolean to disallow write access to "everybody", but we also want to be
// able to handle troublesome settings such as allowing channel_w_stream to anybody in the network. You can allow it, but 
// there's no way to implement sending it. 

	$global_perms = array(
		// Read only permissions
		'view_stream'   => array('channel_r_stream',  intval(PERMS_R_STREAM),  true, t('Can view my "public" stream and posts'), ''),
		'view_profile'  => array('channel_r_profile', intval(PERMS_R_PROFILE), true, t('Can view my "public" channel profile'), ''),
		'view_photos'   => array('channel_r_photos',  intval(PERMS_R_PHOTOS),  true, t('Can view my "public" photo albums'), ''),
		'view_contacts' => array('channel_r_abook',   intval(PERMS_R_ABOOK),   true, t('Can view my "public" address book'), ''),
		'view_storage' => array('channel_r_storage',   intval(PERMS_R_STORAGE),   true, t('Can view my "public" file storage'), ''),
		'view_pages' => array('channel_r_pages',   intval(PERMS_R_PAGES),   true, t('Can view my "public" pages'), ''),

		// Write permissions
		'send_stream'   => array('channel_w_stream',  intval(PERMS_W_STREAM),  false, t('Can send me their channel stream and posts'), ''),
		'post_wall'     => array('channel_w_wall',    intval(PERMS_W_WALL),    false, t('Can post on my channel page ("wall")'), ''),
		'post_comments' => array('channel_w_comment', intval(PERMS_W_COMMENT), false, t('Can comment on my posts'), ''),
		'post_mail'     => array('channel_w_mail',    intval(PERMS_W_MAIL),    false, t('Can send me private mail messages'), ''),
		'post_photos'   => array('channel_w_photos',  intval(PERMS_W_PHOTOS),  false, t('Can post photos to my photo albums'), ''),
		'tag_deliver'   => array('channel_w_tagwall', intval(PERMS_W_TAGWALL), false, t('Can forward to all my channel contacts via post @mentions'), t('Advanced - useful for creating group forum channels')),
		'chat'          => array('channel_w_chat',    intval(PERMS_W_CHAT),    false, t('Can chat with me (when available)'), t('')),
		'write_storage' => array('channel_w_storage',   intval(PERMS_W_STORAGE),   false, t('Can write to my "public" file storage'), ''),
		'write_pages' => array('channel_w_pages',   intval(PERMS_W_PAGES),   false, t('Can edit my "public" pages'), ''),

		'republish' => array('channel_a_republish', intval(PERMS_A_REPUBLISH), false, t('Can source my "public" posts in derived channels'), t('Somewhat advanced - very useful in open communities')),

		'delegate'      => array('channel_a_delegate', intval(PERMS_A_DELEGATE),    false, t('Can administer my channel resources'), t('Extremely advanced. Leave this alone unless you know what you are doing')),
	);
	$ret = array('global_permissions' => $global_perms);
	call_hooks('global_permissions',$ret);
	return $ret['global_permissions'];
}


/**
 * get_all_perms($uid,$observer_xchan)
 *
 * @param $uid : The channel_id associated with the resource owner
 * @param $observer_xchan: The xchan_hash representing the observer
 *
 * @returns: array of all permissions, key is permission name, value is true or false
 */

function get_all_perms($uid,$observer_xchan,$internal_use = true) {

	$global_perms = get_perms();

	// Save lots of individual lookups

	$r = null;
	$c = null;
	$x = null;

	$channel_checked = false;
	$onsite_checked  = false;
	$abook_checked   = false;

	$ret = array();

	foreach($global_perms as $perm_name => $permission) {

		// First find out what the channel owner declared permissions to be.

		$channel_perm = $permission[0];

		if(! $channel_checked) {
			$r = q("select * from channel where channel_id = %d limit 1",
				intval($uid)
			);
			$channel_checked = true;
		}

		// The uid provided doesn't exist. This would be a big fail.

		if(! $r) {
			$ret[$perm_name] = false;
			continue;
		}


		// Next we're going to check for blocked or ignored contacts.
		// These take priority over all other settings.

		if($observer_xchan) {
			if($r[0][$channel_perm] & PERMS_AUTHED) {
				$ret[$perm_name] = true;
				continue;
			}
			
			if(! $abook_checked) {
				$x = q("select abook_my_perms, abook_flags, xchan_network from abook left join xchan on abook_xchan = xchan_hash
					where abook_channel = %d and abook_xchan = '%s' and not ( abook_flags & %d ) limit 1",
					intval($uid),
					dbesc($observer_xchan),
					intval(ABOOK_FLAG_SELF)
				);
				if(! $x) {
					// not in address book, see if they've got an xchan
					$y = q("select xchan_network from xchan where xchan_hash = '%s' limit 1",
	            		dbesc($observer_xchan)
					);
				}

				$abook_checked = true;
			}

			// If they're blocked - they can't read or write
 
			if(($x) && ($x[0]['abook_flags'] & ABOOK_FLAG_BLOCKED)) {
				$ret[$perm_name] = false;
				continue;
			}

			// Check if this is a write permission and they are being ignored
			// This flag is only visible internally.

			if(($x) && ($internal_use) && (! $global_perms[$perm_name][2]) && ($x[0]['abook_flags'] & ABOOK_FLAG_IGNORED)) {
				$ret[$perm_name] = false;
				continue;
			}
		}

		// Check if this $uid is actually the $observer_xchan - if it's your content
		// you always have permission to do anything

		if(($observer_xchan) && ($r[0]['channel_hash'] === $observer_xchan)) {
			$ret[$perm_name] = true;
			continue;
		}

		// Anybody at all (that wasn't blocked or ignored). They have permission.

		if($r[0][$channel_perm] & PERMS_PUBLIC) {
			$ret[$perm_name] = true;
			continue;
		}

		// From here on out, we need to know who they are. If we can't figure it
		// out, permission is denied.

		if(! $observer_xchan) {
			$ret[$perm_name] = false;
			continue;
		}

		// If we're still here, we have an observer, check the network.

		if($r[0][$channel_perm] & PERMS_NETWORK) {
			if(($x && $x[0]['xchan_network'] === 'zot') || ($y && $y[0]['xchan_network'] === 'zot')) {
				$ret[$perm_name] = true;
				continue;
			}
		}

		// If PERMS_SITE is specified, find out if they've got an account on this hub

		if($r[0][$channel_perm] & PERMS_SITE) {
			if(! $onsite_checked) {
				$c = q("select channel_hash from channel where channel_hash = '%s' limit 1",
					dbesc($observer_xchan)
				);

				$onsite_checked = true;
			}
	
			if($c)
				$ret[$perm_name] = true;
			else
				$ret[$perm_name] = false;

			continue;
		}	

		// From here on we require that the observer be a connection and
		// handle whether we're allowing any, approved or specific ones

		if(! $x) {
			$ret[$perm_name] = false;
			continue;
		}

		// They are in your address book, but haven't been approved

		if($r[0][$channel_perm] & PERMS_PENDING) {
			$ret[$perm_name] = true;
			continue;
		}

		if($x[0]['abook_flags'] & ABOOK_FLAG_PENDING) {
			$ret[$perm_name] = false;
			continue;
		}

		// They're a contact, so they have permission

		if($r[0][$channel_perm] & PERMS_CONTACTS) {
			$ret[$perm_name] = true;
			continue;
		}

		// Permission granted to certain channels. Let's see if the observer is one of them

		if($r[0][$channel_perm] & PERMS_SPECIFIC) {
			if(($x[0]['abook_my_perms'] & $global_perms[$perm_name][1])) {
				$ret[$perm_name] = true;
				continue;
			}
		}

		// No permissions allowed.

		$ret[$perm_name] = false;
		continue;

	}

	$arr = array(
		'channel_id'    => $uid,
		'observer_hash' => $observer_xchan,
		'permissions'   => $ret);

	call_hooks('get_all_perms',$arr);
	return $arr['permissions'];
}


function perm_is_allowed($uid,$observer_xchan,$permission) {

	$arr = array(
		'channel_id'    => $uid,
		'observer_hash' => $observer_xchan,
		'permission'    => $permission,
		'result'        => false);

	call_hooks('perm_is_allowed',$arr);
	if($arr['result'])
		return true;

	$global_perms = get_perms();

	// First find out what the channel owner declared permissions to be.

	$channel_perm = $global_perms[$permission][0];

	$r = q("select %s, channel_hash from channel where channel_id = %d limit 1",
		dbesc($channel_perm),
		intval($uid)
	);
	if(! $r)
		return false;

	if($observer_xchan) {
		if($r[0][$channel_perm] & PERMS_AUTHED)
			return true;

		$x = q("select abook_my_perms, abook_flags, xchan_network from abook left join xchan on abook_xchan = xchan_hash 
			where abook_channel = %d and abook_xchan = '%s' and not ( abook_flags & %d ) limit 1",
			intval($uid),
			dbesc($observer_xchan),
			intval(ABOOK_FLAG_SELF)
		);

		// If they're blocked - they can't read or write
 
		if(($x) && ($x[0]['abook_flags'] & ABOOK_FLAG_BLOCKED))
			return false;
		
		if(($x) && (! $global_perms[$permission][2]) && ($x[0]['abook_flags'] & ABOOK_FLAG_IGNORED))
			return false;

		if(! $x) {
			// not in address book, see if they've got an xchan
			$y = q("select xchan_network from xchan where xchan_hash = '%s' limit 1",
	            dbesc($observer_xchan)
			);
		}
	}

	// Check if this $uid is actually the $observer_xchan

	if($r[0]['channel_hash'] === $observer_xchan)
		return true;

	
	if($r[0][$channel_perm] & PERMS_PUBLIC)
		return true;

	// If it's an unauthenticated observer, we only need to see if PERMS_PUBLIC is set

	if(! $observer_xchan) {
		return false;
	}

	// If we're still here, we have an observer, check the network.

	if($r[0][$channel_perm] & PERMS_NETWORK) {
		if (($x && $x[0]['xchan_network'] === 'zot') || ($y && $y[0]['xchan_network'] === 'zot'))
			return true;
	}

	// If PERMS_SITE is specified, find out if they've got an account on this hub

	if($r[0][$channel_perm] & PERMS_SITE) {
		$c = q("select channel_hash from channel where channel_hash = '%s' limit 1",
			dbesc($observer_xchan)
		);
		if($c)
			return true;
		return false;
	}

	// From here on we require that the observer be a connection and
	// handle whether we're allowing any, approved or specific ones

	if(! $x) {
		return false;
	}

	// They are in your address book, but haven't been approved

	if($r[0][$channel_perm] & PERMS_PENDING) {
		return true;
	}

	if($x[0]['abook_flags'] & ABOOK_FLAG_PENDING) {
		return false;
	}

	// They're a contact, so they have permission

	if($r[0][$channel_perm] & PERMS_CONTACTS) {
		return true;
	}

	// Permission granted to certain channels. Let's see if the observer is one of them

	if(($r) && $r[0][$channel_perm] & PERMS_SPECIFIC) {
		if($x[0]['abook_my_perms'] & $global_perms[$permission][1])
			return true;
	}

	// No permissions allowed.

	return false;		
}


// Check a simple array of observers against a permissions
// return a simple array of those with permission

function check_list_permissions($uid,$arr,$perm) {
	$result = array();
	if($arr)
		foreach($arr as $x)
			if(perm_is_allowed($uid,$x,$perm))
				$result[] = $x;
	return($result);
}


function site_default_perms() {

	$typical = array(
		'view_stream'   => PERMS_PUBLIC,
		'view_profile'  => PERMS_PUBLIC,
		'view_photos'   => PERMS_PUBLIC,
		'view_contacts' => PERMS_PUBLIC,
		'view_storage'  => PERMS_PUBLIC,
		'view_pages'    => PERMS_PUBLIC,
		'send_stream'   => PERMS_SPECIFIC,
		'post_wall'     => PERMS_SPECIFIC,
		'post_comments' => PERMS_SPECIFIC,
		'post_mail'     => PERMS_SPECIFIC,
		'post_photos'   => 0,
		'tag_deliver'   => PERMS_SPECIFIC,
		'chat'          => PERMS_SPECIFIC,
		'write_storage' => 0,
		'write_pages'   => 0,
		'delegate'      => 0,
	);

	$global_perms = get_perms();
	$ret = array();

	foreach($global_perms as $perm => $v) {
		$x = get_config('default_perms',$perm);
		if($x === false)
			$x = $typical[$perm];
		$ret[$perm] = $x;
	}
	return $ret;
}