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/**
* @copyright 2022 Louis Chmn <louis@chmn.me>
*
* @author Louis Chmn <louis@chmn.me>
*
* @license AGPL-3.0-or-later
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
export const ATOMIC_PERMISSIONS = {
NONE: 0,
READ: 1,
UPDATE: 2,
CREATE: 4,
DELETE: 8,
SHARE: 16,
}
export const BUNDLED_PERMISSIONS = {
READ_ONLY: ATOMIC_PERMISSIONS.READ,
UPLOAD_AND_UPDATE: ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.UPDATE | ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.DELETE,
FILE_DROP: ATOMIC_PERMISSIONS.CREATE,
ALL: ATOMIC_PERMISSIONS.UPDATE | ATOMIC_PERMISSIONS.CREATE | ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.DELETE | ATOMIC_PERMISSIONS.SHARE,
ALL_FILE: ATOMIC_PERMISSIONS.UPDATE | ATOMIC_PERMISSIONS.READ | ATOMIC_PERMISSIONS.SHARE,
}
/**
* Return whether a given permissions set contains some permissions.
*
* @param {number} initialPermissionSet - the permissions set.
* @param {number} permissionsToCheck - the permissions to check.
* @return {boolean}
*/
export function hasPermissions(initialPermissionSet, permissionsToCheck) {
return initialPermissionSet !== ATOMIC_PERMISSIONS.NONE && (initialPermissionSet & permissionsToCheck) === permissionsToCheck
}
/**
* Return whether a given permissions set is valid.
*
* @param {number} permissionsSet - the permissions set.
*
* @return {boolean}
*/
export function permissionsSetIsValid(permissionsSet) {
// Must have at least READ or CREATE permission.
if (!hasPermissions(permissionsSet, ATOMIC_PERMISSIONS.READ) && !hasPermissions(permissionsSet, ATOMIC_PERMISSIONS.CREATE)) {
return false
}
// Must have READ permission if have UPDATE or DELETE.
if (!hasPermissions(permissionsSet, ATOMIC_PERMISSIONS.READ) && (
hasPermissions(permissionsSet, ATOMIC_PERMISSIONS.UPDATE) || hasPermissions(permissionsSet, ATOMIC_PERMISSIONS.DELETE)
)) {
return false
}
return true
}
/**
* Add some permissions to an initial set of permissions.
*
* @param {number} initialPermissionSet - the initial permissions.
* @param {number} permissionsToAdd - the permissions to add.
*
* @return {number}
*/
export function addPermissions(initialPermissionSet, permissionsToAdd) {
return initialPermissionSet | permissionsToAdd
}
/**
* Remove some permissions from an initial set of permissions.
*
* @param {number} initialPermissionSet - the initial permissions.
* @param {number} permissionsToSubtract - the permissions to remove.
*
* @return {number}
*/
export function subtractPermissions(initialPermissionSet, permissionsToSubtract) {
return initialPermissionSet & ~permissionsToSubtract
}
/**
* Toggle some permissions from an initial set of permissions.
*
* @param {number} initialPermissionSet - the permissions set.
* @param {number} permissionsToToggle - the permissions to toggle.
*
* @return {number}
*/
export function togglePermissions(initialPermissionSet, permissionsToToggle) {
if (hasPermissions(initialPermissionSet, permissionsToToggle)) {
return subtractPermissions(initialPermissionSet, permissionsToToggle)
} else {
return addPermissions(initialPermissionSet, permissionsToToggle)
}
}
/**
* Return whether some given permissions can be toggled from a permission set.
*
* @param {number} permissionSet - the initial permissions set.
* @param {number} permissionsToToggle - the permissions to toggle.
*
* @return {boolean}
*/
export function canTogglePermissions(permissionSet, permissionsToToggle) {
return permissionsSetIsValid(togglePermissions(permissionSet, permissionsToToggle))
}
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