public bool GroupExists(string name) { var query = new GroupExistsQuery(dbContext.Groups); return(query.Execute(name)); }
public async Task <ActionResult <GroupMembershipResource> > CreateMembership([FromBody] CreateMembershipBody body, CancellationToken cancellationToken = default) { if (!ModelState.IsValid) { return(BadRequest(ModelState)); } // Check if the provided group exists GroupExistsQuery groupExistsQuery = new GroupExistsQuery { GroupId = body.GroupId }; bool groupExists = await _mediator.Send(groupExistsQuery, cancellationToken); if (!groupExists) { return(NotFound(new ErrorResource { StatusCode = StatusCodes.Status404NotFound, Message = $"Group with ID '{body.GroupId}' does not exist" })); } // Check if the provided user exists UserExistsQuery userExistsQuery = new UserExistsQuery { UserId = body.UserId }; bool userExists = await _mediator.Send(userExistsQuery, cancellationToken); if (!userExists) { return(NotFound(new ErrorResource { StatusCode = StatusCodes.Status404NotFound, Message = $"User with ID '{body.UserId}' does not exist" })); } // Check if the current user is permitted to create memberships in this group CanCreateMembershipQuery canCreateQuery = new CanCreateMembershipQuery { GroupId = body.GroupId }; bool canCreate = await _mediator.Send(canCreateQuery, cancellationToken); if (!canCreate) { return(StatusCode(StatusCodes.Status403Forbidden, new ErrorResource { StatusCode = StatusCodes.Status403Forbidden, Message = "You are not permitted to add users to this group. This privilege is only granted to administrators of the group" })); } // Check if such a membership does not already exist MembershipCombinationExistsQuery membershipExistsQuery = _mapper.Map <CreateMembershipBody, MembershipCombinationExistsQuery>(body); bool membershipExists = await _mediator.Send(membershipExistsQuery, cancellationToken); if (membershipExists) { return(StatusCode(StatusCodes.Status403Forbidden, new ErrorResource { StatusCode = StatusCodes.Status403Forbidden, Message = "This user is already a member of this group" })); } CreateMembershipCommand createCommand = _mapper.Map <CreateMembershipBody, CreateMembershipCommand>(body); GroupMembershipResource membership = await _mediator.Send(createCommand, cancellationToken); return(CreatedAtAction(nameof(GetMembershipById), new { membershipId = membership.GroupMembershipId }, membership)); }