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MembershipId,
MembershipRepository,
Membership,
GroupService,
MembershipQueryOptions,
} from '@models';
import {
MembershipNotFoundError,
CannotChangeOwnerMembershipError,
NotAdminOfGroupError,
NotMemberOfGroupError,
InternalError,
} from '@errors';
import debug from 'debug';
import {bindUser} from '@util/user-bound-logging';
/**
* Logging method.
*/
const log = debug('group-car:membership:service');
/**
* Logging method for errors.
*/
const error = debug('group-car:membership:service:error');
/**
* Service for complex membership operations.
*/
export const MembershipService = {
/**
* Retrieves a membership by its ID.
*
* Before retrieving the membership, the method makes sure that `currentUser`
* is authorized to access the membership. A user is authorized if one of
* two conditions are true.
*
* - `currentUser.id === id.userId`: The user accesses their own memberships
* - `currentUser` is member of the group specified in `id`
*
* The reasoning behind this is that a user should only be able to get
* memberships which concern them and not be able to check memberships
* between every user and group. This would infringe on the privacy of
* other users.
*
* @param currentUser - Currently logged-in user
* @param id - ID to search for
* @param options - Options for the repository queries
*
* @throws {@link NotMemberOfGroupError}
* If `currentUser.id !== id.userId` and the logged-in user is not
* a member of the given group
*
* @throws {@link MembershipNotFoundError}
* *Rethrown from `MembershipRepository.findById()`*. Is thrown if the
* logged-in user is authorized to access the membership,
* but it doesn't exist
*/
async findById(
currentUser: Express.User,
id: MembershipId,
options?: Partial<MembershipQueryOptions>,
): Promise<Membership> {
const userId = currentUser.id;
const userLog = bindUser(log, userId);
const userError = bindUser(error, userId);
// Check if parameter has correct type
if (typeof userId !== 'number') {
throw new TypeError('Id of current user has to be a number');
}
userLog('Find membership with %o', id);
/*
* Check if logged-in user is the specified user.
* If yes, skip the membership check for the logged-in user.
* If no, check if the logged-in user is a member of the group.
*/
if (userId !== id.userId) {
userLog('Not user of membership. ' +
'Check if member of group');
// Check if the logged-in user is member of that group
try {
await MembershipRepository.findById(
{
userId: userId,
groupId: id.groupId,
},
);
userLog('Is member of group referenced in membership');
} catch (err) {
Eif (err instanceof MembershipNotFoundError) {
// Logged-in user is not a member, throw an UnauthorizedError
userError('Not member of group referenced ' +
'in membership $o', id);
throw new NotMemberOfGroupError();
} else {
// Something else went wrong, rethrow the error
userError('Unexpected error', err);
throw err;
}
}
}
userLog('Can access membership %o', id);
// Call the repository method
return MembershipRepository.findById(id, options);
},
/**
* Updates whether the specified user is an admin
* of the specified group.
* @param currentUser - Currently logged-in user
* @param id - The id of the membership which should be updated
* @param isAdmin - Whether the user should be admin of the group
*
* @throws {@link UnauthorizedError} if the currently logged-in
* user is neither the user for which the admin permission should
* be changed nor an admin of the referenced group.
*/
async changeAdminPermission(
currentUser: Express.User,
id: MembershipId,
isAdmin: boolean,
): Promise<Membership> {
const userLog = bindUser(log, currentUser.id);
const userError = bindUser(error, currentUser.id);
// Check if parameter has correct type
if (typeof currentUser.id !== 'number') {
throw new TypeError('Id of current user has to be a number');
}
userLog('Change admin of membership %o', id);
// Check if current user is an admin of the group
let currentMembership;
try {
currentMembership = await this.findById(
currentUser, {
userId: currentUser.id,
groupId: id.groupId,
},
);
userLog('Is member of group %d', id.groupId);
} catch (err) {
Eif (err instanceof MembershipNotFoundError) {
userError('Is not member of group %d', id.groupId);
throw new NotMemberOfGroupError();
} else {
userError('Unknown error', err);
throw err;
}
}
if (!currentMembership.isAdmin) {
userError('Is not admin of group %d. ' +
'Can\'t give or take admin', id.groupId);
throw new NotAdminOfGroupError();
}
// Check if user is owner of group
const group = await GroupService.findById(currentUser, id.groupId);
if (group.ownerId == id.userId || group.Owner?.id === id.userId) {
userError('Can\'t change admin of ' +
'owner of group %d', id.groupId);
throw new CannotChangeOwnerMembershipError();
}
userLog('Change admin permission');
return MembershipRepository.changeAdminPermission(id, isAdmin);
},
/**
* Gets all memberships of the currently logged-in user.
* @param currentUser - The currently logged-in user.
*/
async findAllForUser(
currentUser: Express.User,
): Promise<Membership[]> {
const userLog = bindUser(log, currentUser.id);
userLog('Requests to get all their membership');
return MembershipRepository.findAllForUser(
currentUser.id,
{
withUserData: true,
},
);
},
/**
* Gets all memberships for the specified group.
* @param currentUser - The currently logged in user
* @param groupId - The id of the group
*/
async findAllForGroup(
currentUser: Express.User,
groupId: number,
): Promise<Membership[]> {
const userLog = bindUser(log, currentUser.id);
const userError = bindUser(error, currentUser.id);
// Check if user is member of group
userLog('Request to find all memberships for group %d', groupId);
try {
await MembershipRepository.findById({userId: currentUser.id, groupId});
userLog('User is a member of group %d', groupId);
} catch (e) {
if (e instanceof MembershipNotFoundError) {
userError('Is not a member of group %d', groupId);
throw new NotMemberOfGroupError();
} else {
userError('Unexpected error while checking membership: %s', e);
throw e;
}
}
userLog('Get all memberships for group %d', groupId);
return MembershipRepository.findAllForGroup(
groupId,
{
withUserData: true,
},
);
},
/**
* Checks if the current user is a member
* of the specified group.
* @param currentUser - The currently logged-in user
* @param groupId - The if of the group.
*/
async isMember(
currentUser: Express.User,
groupId: number,
): Promise<boolean> {
const userLog = bindUser(log, currentUser.id);
const userError = bindUser(error, currentUser.id);
userLog('Requests to check if they are a member of group %d', groupId);
try {
await MembershipRepository.findById({groupId, userId: currentUser.id});
return true;
} catch (e) {
if (e instanceof MembershipNotFoundError) {
return false;
} else {
userError(
'Unexpected error while checking membership for group %d',
groupId,
);
throw new InternalError('Couldn\'t check membership');
}
}
},
};
export default MembershipService;
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