/**
* Given a view id, and a user id (defaults to currently logged in user if not
* specified) will return wether this user is allowed to look at this view.
*
* @param mixed $view viewid or View to check
* @param integer $user_id User trying to look at the view (defaults to
* currently logged in user, or null if user isn't logged in)
*
* @returns boolean Wether the specified user can look at the specified view.
*/
function can_view_view($view, $user_id = null)
{
global $USER, $SESSION;
if (defined('BULKEXPORT')) {
return true;
}
$now = time();
$dbnow = db_format_timestamp($now);
if ($user_id === null) {
$user = $USER;
$user_id = $USER->get('id');
} else {
$user = new User();
if ($user_id) {
try {
$user->find_by_id($user_id);
} catch (AuthUnknownUserException $e) {
}
}
}
$publicviews = get_config('allowpublicviews');
$publicprofiles = get_config('allowpublicprofiles');
// If the user is logged out and the publicviews & publicprofiles sitewide configs are false,
// we can deny access without having to hit the database at all
if (!$user_id && !$publicviews && !$publicprofiles) {
return false;
}
require_once get_config('libroot') . 'view.php';
if ($view instanceof View) {
$view_id = $view->get('id');
} else {
$view = new View($view_id = $view);
}
// If the page belongs to an individual, check for individual-specific overrides
if ($view->get('owner')) {
$ownerobj = $view->get_owner_object();
// Suspended user
if ($ownerobj->suspendedctime) {
return false;
}
// Probationary user (no public pages or profiles)
// (setting these here instead of doing a return-false, so that we can do checks for
// logged-in users later)
require_once get_config('libroot') . 'antispam.php';
$onprobation = is_probationary_user($ownerobj->id);
$publicviews = $publicviews && !$onprobation;
$publicprofiles = $publicprofiles && !$onprobation;
// Member of an institution that prohibits public pages
// (group views and logged in users are not affected by
// the institution level config for public views)
$owner = new User();
$owner->find_by_id($ownerobj->id);
$publicviews = $publicviews && $owner->institution_allows_public_views();
}
// Now that we've examined the page owner, check again for whether it can be viewed by a logged-out user
if (!$user_id && !$publicviews && !$publicprofiles) {
return false;
}
if ($user_id && $user->can_edit_view($view)) {
return true;
}
// If the view's owner is suspended, deny access to the view
if ($view->get('owner')) {
if (!($owner = $view->get_owner_object()) || $owner->suspendedctime) {
return false;
}
}
if ($SESSION->get('mnetuser')) {
$mnettoken = get_cookie('mviewaccess:' . $view_id);
}
// If the page has been marked "objectionable" admins should be able to view
// it for review purposes.
if ($view->is_objectionable()) {
if ($owner = $view->get('owner')) {
if ($user->is_admin_for_user($owner)) {
return true;
}
} else {
if ($view->get('group') && $user->get('admin')) {
return true;
}
}
}
// Overriding start/stop dates are set by the owner to deny access
// to users who would otherwise be allowed to see the view. However,
// for some kinds of access (e.g. objectionable content, submitted
// views), we have to override the override and let the logged in
// user see it anyway. So we can't return false now, we have to wait
// till we find out what kind of view_access record is being used.
$overridestart = $view->get('startdate');
$overridestop = $view->get('stopdate');
$allowedbyoverride = (empty($overridestart) || $overridestart < $dbnow) && (empty($overridestop) || $overridestop > $dbnow);
$access = View::user_access_records($view_id, $user_id);
if (empty($access)) {
return false;
}
foreach ($access as &$a) {
if ($a->accesstype == 'public' && $allowedbyoverride) {
if ($publicviews) {
return true;
} else {
if ($publicprofiles && $view->get('type') == 'profile') {
return true;
}
}
} else {
if ($a->token && ($allowedbyoverride || !$a->visible)) {
$usertoken = get_cookie('viewaccess:' . $view_id);
if ($a->token == $usertoken && $publicviews) {
return true;
}
if (!empty($mnettoken) && $a->token == $mnettoken) {
$mnetviewlist = $SESSION->get('mnetviewaccess');
if (empty($mnetviewlist)) {
$mnetviewlist = array();
}
$mnetviewlist[$view_id] = true;
$SESSION->set('mnetviewaccess', $mnetviewlist);
return true;
}
// Don't bother to pull the collection out unless the user actually
// has some collection access cookies.
if ($ctokens = get_cookies('caccess:')) {
$cid = $view->collection_id();
if ($cid && isset($ctokens[$cid]) && $a->token == $ctokens[$cid]) {
return true;
}
}
} else {
if ($user_id) {
if ($a->accesstype == 'friends') {
$owner = $view->get('owner');
if (!get_field_sql('
SELECT COUNT(*) FROM {usr_friend} f WHERE (usr1=? AND usr2=?) OR (usr1=? AND usr2=?)', array($owner, $user_id, $user_id, $owner))) {
continue;
}
} else {
if ($a->institution) {
// Check if user belongs to the allowed institution
if (!in_array($a->institution, array_keys($user->get('institutions')))) {
continue;
}
}
}
if (!$allowedbyoverride && $a->visible) {
continue;
}
// The view must have loggedin access, user access for the user
// or group/role access for one of the user's groups
return true;
}
}
}
}
return false;
}
/**
* Get all views & collections for a (user,group), grouped
* by their accesslists as defined by the accessconf column
*
* @param integer $owner
* @param integer $group
*
* @return array
*/
public static function get_accesslists($owner = null, $group = null, $institution = null)
{
require_once 'institution.php';
if (!is_null($owner) && !is_array($owner) && $owner > 0) {
$ownerobj = new User();
$ownerobj->find_by_id($owner);
}
$data = array();
list($data['collections'], $data['views']) = self::get_views_and_collections($owner, $group, $institution);
// Remember one representative viewid in each collection
$viewindex = array();
// Add strings to describe startdate/stopdate access overrides
foreach ($data['collections'] as &$c) {
$view = current($c['views']);
$viewindex[$view['id']] = array('type' => 'collections', 'id' => $c['id']);
$c['access'] = self::access_override_description($view);
$c['viewid'] = $view['id'];
}
foreach ($data['views'] as &$v) {
$viewindex[$v['id']] = array('type' => 'views', 'id' => $v['id']);
$v['access'] = self::access_override_description($v);
$v['viewid'] = $v['id'];
}
if (empty($viewindex)) {
return $data;
}
// Get view_access records, apart from those with visible = 0 (system access records)
$accessgroups = get_records_sql_array('
SELECT va.*, g.grouptype, g.name, g.urlid
FROM {view_access} va LEFT OUTER JOIN {group} g ON (g.id = va.group AND g.deleted = 0)
WHERE va.view IN (' . join(',', array_keys($viewindex)) . ') AND va.visible = 1
ORDER BY va.view, va.accesstype, g.grouptype, va.role, g.name, va.group, va.usr', array());
if (!$accessgroups) {
return $data;
}
if (!function_exists('is_probationary_user')) {
require_once get_config('libroot') . 'antispam.php';
}
foreach ($accessgroups as $access) {
// remove 'Public' from the list if the owner isn't allowed to have them
if ($access->accesstype == 'public' && (get_config('allowpublicviews') != 1 || isset($ownerobj) && !$ownerobj->institution_allows_public_views() || isset($ownerobj) && is_probationary_user($ownerobj->id))) {
continue;
}
$vi = $viewindex[$access->view];
// Just count secret urls.
if ($access->token) {
if (!isset($data[$vi['type']][$vi['id']]['secreturls'])) {
$data[$vi['type']][$vi['id']]['secreturls'] = 0;
}
$data[$vi['type']][$vi['id']]['secreturls']++;
continue;
}
$key = null;
if ($access->usr) {
$access->accesstype = 'user';
$access->id = $access->usr;
} else {
if ($access->group) {
$access->accesstype = 'group';
$access->id = $access->group;
if ($access->role) {
$access->roledisplay = get_string($access->role, 'grouptype.' . $access->grouptype);
}
$access->groupurl = group_homepage_url((object) array('id' => $access->group, 'urlid' => $access->urlid));
} else {
if ($access->institution) {
$access->accesstype = 'institution';
$access->id = $access->institution;
$access->name = institution_display_name($access->institution);
} else {
$key = $access->accesstype;
}
}
}
if ($key) {
if (!isset($data[$vi['type']][$vi['id']]['accessgroups'][$key])) {
$data[$vi['type']][$vi['id']]['accessgroups'][$key] = (array) $access;
}
} else {
$data[$vi['type']][$vi['id']]['accessgroups'][] = (array) $access;
}
}
return $data;
}
/**
* Given a view id, and a user id (defaults to currently logged in user if not
* specified) will return wether this user is allowed to look at this view.
*
* @param mixed $view viewid or View to check
* @param integer $user_id User trying to look at the view (defaults to
* currently logged in user, or null if user isn't logged in)
*
* @returns boolean Wether the specified user can look at the specified view.
*/
function can_view_view($view, $user_id = null)
{
global $USER, $SESSION;
if (defined('BULKEXPORT')) {
return true;
}
$now = time();
$dbnow = db_format_timestamp($now);
if ($user_id === null) {
$user = $USER;
$user_id = $USER->get('id');
} else {
$user = new User();
if ($user_id) {
try {
$user->find_by_id($user_id);
} catch (AuthUnknownUserException $e) {
}
}
}
$publicviews = get_config('allowpublicviews');
$publicprofiles = get_config('allowpublicprofiles');
// OVERWRITE 1: deletion
//if (!$user_id && !$publicviews && !$publicprofiles) {
// return false;
//}
// END OVERWRITE 1
if (!class_exists('View')) {
require_once get_config('libroot') . 'view.php';
}
if ($view instanceof View) {
$view_id = $view->get('id');
} else {
$view = new View($view_id = $view);
}
// group views and logged in users are not affected by
// the institution level config for public views
if (empty($user_id) && ($ownerobj = $view->get_owner_object())) {
$owner = new User();
$owner->find_by_id($ownerobj->id);
if (!$owner->institution_allows_public_views()) {
return false;
}
}
if ($user_id && $user->can_edit_view($view)) {
return true;
}
$access = View::user_access_records($view_id, $user_id);
if (empty($access)) {
return false;
}
// If the view's owner is suspended, deny access to the view
if ($view->get('owner')) {
if (!($owner = $view->get_owner_object()) || $owner->suspendedctime) {
return false;
}
}
// Overriding start/stop dates are set by the owner to deny access
// to users who would otherwise be allowed to see the view. However,
// for some kinds of access (e.g. objectionable content, submitted
// views), we have to override the override and let the logged in
// user see it anyway. So we can't return false now, we have to wait
// till we find out what kind of view_access record is being used.
$overridestart = $view->get('startdate');
$overridestop = $view->get('stopdate');
$allowedbyoverride = (empty($overridestart) || $overridestart < $dbnow) && (empty($overridestop) || $overridestop > $dbnow);
if ($SESSION->get('mnetuser')) {
$mnettoken = get_cookie('mviewaccess:' . $view_id);
}
foreach ($access as &$a) {
if ($a->accesstype == 'public' && $allowedbyoverride) {
if ($publicviews) {
return true;
} else {
if ($publicprofiles && $view->get('type') == 'profile') {
return true;
}
}
} else {
if ($a->token && ($allowedbyoverride || !$a->visible)) {
$usertoken = get_cookie('viewaccess:' . $view_id);
// OVERWRITE 2: replacement, changed from:
//if ($a->token == $usertoken && $publicviews) {
// return true;
//}
// to:
if ($a->token == $usertoken) {
if (!$publicviews) {
global $CFG;
$mhr_view = $CFG->current_app->selectFromMhrTable('view', 'id', $view_id, true);
if ($mhr_view) {
if (!isset($mhr_view->institution) || $mhr_view->institution == '') {
return false;
}
}
}
return true;
}
// END OVERWRITE 2
if (!empty($mnettoken) && $a->token == $mnettoken) {
$mnetviewlist = $SESSION->get('mnetviewaccess');
if (empty($mnetviewlist)) {
$mnetviewlist = array();
}
$mnetviewlist[$view_id] = true;
$SESSION->set('mnetviewaccess', $mnetviewlist);
return true;
}
// Don't bother to pull the collection out unless the user actually
// has some collection access cookies.
if ($ctokens = get_cookies('caccess:')) {
$cid = $view->collection_id();
if ($cid && isset($ctokens[$cid]) && $a->token == $ctokens[$cid]) {
return true;
}
}
} else {
if ($user_id) {
if ($a->accesstype == 'friends') {
$owner = $view->get('owner');
if (!get_field_sql('
SELECT COUNT(*) FROM {usr_friend} f WHERE (usr1=? AND usr2=?) OR (usr1=? AND usr2=?)', array($owner, $user_id, $user_id, $owner))) {
continue;
}
} else {
if ($a->institution) {
// Check if user belongs to the allowed institution
if (!in_array($a->institution, array_keys($user->get('institutions')))) {
continue;
}
} else {
if ($a->accesstype == 'objectionable') {
if ($owner = $view->get('owner')) {
if ($user->is_admin_for_user($owner)) {
return true;
}
} else {
if ($view->get('group') && $user->get('admin')) {
return true;
}
}
continue;
}
}
}
if (!$allowedbyoverride && $a->visible) {
continue;
}
// The view must have loggedin access, user access for the user
// or group/role access for one of the user's groups
return true;
}
}
}
}
return false;
}
