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));
}
