D11413.1767101410.diff
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D11413.1767101410.diff
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	diff --git a/services/identity/src/grpc_services/authenticated.rs b/services/identity/src/grpc_services/authenticated.rs
	--- a/services/identity/src/grpc_services/authenticated.rs
	+++ b/services/identity/src/grpc_services/authenticated.rs
	@@ -403,6 +403,27 @@
	let (user_id, _) = get_user_and_device_id(&request)?;
	let message = request.into_inner();

	+ let mut get_farcaster_users_response = self
	+ .db_client
	+ .get_farcaster_users(vec![message.farcaster_id.clone()])
	+ .await
	+ .map_err(handle_db_error)?;
	+
	+ if get_farcaster_users_response.len() > 1 {
	+ error!("multiple users associated with the same Farcaster ID");
	+ return Err(Status::failed_precondition("cannot link Farcaster ID"));
	+ }
	+
	+ if let Some(u) = get_farcaster_users_response.pop() {
	+ if u.0.user_id == user_id {
	+ return Ok(Response::new(Empty {}));
	+ } else {
	+ return Err(Status::already_exists(
	+ "farcaster ID already associated with different user",
	+ ));
	+ }
	+ }
	+
	self
	.db_client
	.add_farcaster_id(user_id, message.farcaster_id)