pub(crate) fn filter_proposals(
        ciphersuite: &Ciphersuite,
        backend: &impl OpenMlsCryptoProvider,
        proposals_by_reference: &'a [&MlsPlaintext],
        proposals_by_value: &'a [&Proposal],
        own_index: LeafIndex,
        tree_size: LeafIndex,
    ) -> Result<(Self, bool), ProposalQueueError> {
        #[derive(Clone)]
        struct Member<'a> {
            updates: Vec<QueuedProposal<'a>>,
            removes: Vec<QueuedProposal<'a>>,
        }
        let mut members: Vec<Member> = vec![
            Member {
                updates: vec![],
                removes: vec![],
            };
            tree_size.as_usize()
        ];
        let mut adds: HashSet<ProposalReference> = HashSet::new();
        let mut valid_proposals: HashSet<ProposalReference> = HashSet::new();
        let mut proposal_pool: HashMap<ProposalReference, QueuedProposal> = HashMap::new();
        let mut contains_own_updates = false;

        let sender = Sender {
            sender_type: SenderType::Member,
            sender: own_index,
        };

        // Aggregate both proposal types to a common iterator
        // We checked earlier that only proposals can end up here
        let mut queued_proposal_list = proposals_by_reference
            .iter()
            .map(|&mls_plaintext| {
                QueuedProposal::from_mls_plaintext(ciphersuite, backend, mls_plaintext)
            })
            .collect::<Result<Vec<QueuedProposal>, _>>()?;

        queued_proposal_list.extend(
            proposals_by_value
                .iter()
                .map(|&p| QueuedProposal::from_proposal_and_sender(ciphersuite, backend, p, sender))
                .collect::<Result<Vec<QueuedProposal>, _>>()?
                .into_iter(),
        );

        // Parse proposals and build adds and member list
        for queued_proposal in queued_proposal_list {
            match queued_proposal.proposal.proposal_type() {
                ProposalType::Add => {
                    adds.insert(queued_proposal.proposal_reference());
                    proposal_pool.insert(queued_proposal.proposal_reference(), queued_proposal);
                }
                ProposalType::Update => {
                    let sender_index = queued_proposal.sender.sender.as_usize();
                    if sender_index != own_index.as_usize() {
                        members[sender_index].updates.push(queued_proposal.clone());
                    } else {
                        contains_own_updates = true;
                    }
                    let proposal_reference = queued_proposal.proposal_reference();
                    proposal_pool.insert(proposal_reference, queued_proposal);
                }
                ProposalType::Remove => {
                    let removed_index =
                        queued_proposal.proposal.as_remove().unwrap().removed as usize;
                    if removed_index < tree_size.as_usize() {
                        members[removed_index].updates.push(queued_proposal.clone());
                    }
                    let proposal_reference = queued_proposal.proposal_reference();
                    proposal_pool.insert(proposal_reference, queued_proposal);
                }
                ProposalType::Presharedkey => {
                    valid_proposals.insert(queued_proposal.proposal_reference());
                    proposal_pool.insert(queued_proposal.proposal_reference(), queued_proposal);
                }
                ProposalType::Reinit => {
                    // TODO #141: Only keep one ReInit
                    proposal_pool.insert(queued_proposal.proposal_reference(), queued_proposal);
                }
            }
        }
        // Check for presence of Removes and delete Updates
        for member in members.iter_mut() {
            // Check if there are Removes
            if !member.removes.is_empty() {
                // Delete all Updates when a Remove is found
                member.updates = Vec::new();
                // Only keep the last Remove
                valid_proposals.insert(member.removes.last().unwrap().proposal_reference());
            }
            if !member.updates.is_empty() {
                // Only keep the last Update
                valid_proposals.insert(member.updates.last().unwrap().proposal_reference());
            }
        }
        // Only retain `adds` and `valid_proposals`
        let mut proposal_queue = ProposalQueue::default();
        for proposal_reference in adds.iter().chain(valid_proposals.iter()) {
            proposal_queue.add(match proposal_pool.get(proposal_reference) {
                Some(queued_proposal) => queued_proposal.clone(),
                None => return Err(ProposalQueueError::ProposalNotFound),
            });
        }
        Ok((proposal_queue, contains_own_updates))
    }
/// Filters received proposals
///
/// 11.2 Commit
/// If there are multiple proposals that apply to the same leaf,
/// the committer chooses one and includes only that one in the Commit,
/// considering the rest invalid. The committer MUST prefer any Remove
/// received, or the most recent Update for the leaf if there are no
/// Removes. If there are multiple Add proposals for the same client,
/// the committer again chooses one to include and considers the rest
/// invalid.
///
/// The function performs the following steps:
///
/// - Extract Adds and filter for duplicates
/// - Build member list with chains: Updates & Removes
/// - Check for invalid indexes and drop proposal
/// - Check for presence of Removes and delete Updates
/// - Only keep the last Update
///
/// Return a `ProposalQueue` a bool that indicates whether Updates for the
/// own node were included
Filters received proposals
11.2 Commit
If there are multiple proposals that apply to the same leaf,
the committer chooses one and includes only that one in the Commit,
considering the rest invalid. The committer MUST prefer any Remove
received, or the most recent Update for the leaf if there are no
Removes. If there are multiple Add proposals for the same client,
the committer again chooses one to include and considers the rest
invalid.

The function performs the following steps.

Extract Adds and filter for duplicates
Build member list with chains: Updates & Removes
Check for invalid indexes and drop proposal
Check for presence of Removes and delete Updates
Only keep the last Update

Return a `ProposalQueue` a bool that indicates whether Updates for the
own node were included
Filters received proposals 11 . 2 Commit If there are multiple proposals that apply to the same leaf the committer chooses one and includes only that one in the Commit considering the rest invalid . The committer MUST prefer any Remove received or the most recent Update for the leaf if there are no Removes . If there are multiple Add proposals for the same client the committer again chooses one to include and considers the rest invalid . The function performs the following steps . Extract Adds and filter for duplicates Build member list with chains : Updates & Removes Check for invalid indexes and drop proposal Check for presence of Removes and delete Updates Only keep the last Update Return a ` ProposalQueue ` a bool that indicates whether Updates for the own node were included
pub(crate) fn filter_proposals(
        ciphersuite: &Ciphersuite,
        backend: &impl OpenMlsCryptoProvider,
        proposals_by_reference: &'a [&MlsPlaintext],
        proposals_by_value: &'a [&Proposal],
        own_index: LeafIndex,
        tree_size: LeafIndex,
    ) -> Result<(Self, bool), ProposalQueueError> {
        #[derive(Clone)]
        struct Member<'a> {
            updates: Vec<QueuedProposal<'a>>,
            removes: Vec<QueuedProposal<'a>>,
        }
        let mut members: Vec<Member> = vec![
            Member {
                updates: vec![],
                removes: vec![],
            };
            tree_size.as_usize()
        ];
        let mut adds: HashSet<ProposalReference> = HashSet::new();
        let mut valid_proposals: HashSet<ProposalReference> = HashSet::new();
        let mut proposal_pool: HashMap<ProposalReference, QueuedProposal> = HashMap::new();
        let mut contains_own_updates = false;
        let sender = Sender {
            sender_type: SenderType::Member,
            sender: own_index,
        };
        // Aggregate both proposal types to a common iterator
        // We checked earlier that only proposals can end up here
        let mut queued_proposal_list = proposals_by_reference
            .iter()
            .map(|&mls_plaintext| {
                QueuedProposal::from_mls_plaintext(ciphersuite, backend, mls_plaintext)
            })
            .collect::<Result<Vec<QueuedProposal>, _>>()?;
        queued_proposal_list.extend(
            proposals_by_value
                .iter()
                .map(|&p| QueuedProposal::from_proposal_and_sender(ciphersuite, backend, p, sender))
                .collect::<Result<Vec<QueuedProposal>, _>>()?
                .into_iter(),
        );
        // Parse proposals and build adds and member list
        for queued_proposal in queued_proposal_list {
            match queued_proposal.proposal.proposal_type() {
                ProposalType::Add => {
                    adds.insert(queued_proposal.proposal_reference());
                    proposal_pool.insert(queued_proposal.proposal_reference(), queued_proposal);
                }
                ProposalType::Update => {
                    let sender_index = queued_proposal.sender.sender.as_usize();
                    if sender_index != own_index.as_usize() {
                        members[sender_index].updates.push(queued_proposal.clone());
                    } else {
                        contains_own_updates = true;
                    }
                    let proposal_reference = queued_proposal.proposal_reference();
                    proposal_pool.insert(proposal_reference, queued_proposal);
                }
                ProposalType::Remove => {
                    let removed_index =
                        queued_proposal.proposal.as_remove().unwrap().removed as usize;
                    if removed_index < tree_size.as_usize() {
                        members[removed_index].updates.push(queued_proposal.clone());
                    }
                    let proposal_reference = queued_proposal.proposal_reference();
                    proposal_pool.insert(proposal_reference, queued_proposal);
                }
                ProposalType::Presharedkey => {
                    valid_proposals.insert(queued_proposal.proposal_reference());
                    proposal_pool.insert(queued_proposal.proposal_reference(), queued_proposal);
                }
                ProposalType::Reinit => {
                    // TODO #141: Only keep one ReInit
                    proposal_pool.insert(queued_proposal.proposal_reference(), queued_proposal);
                }
            }
        }
        // Check for presence of Removes and delete Updates
        for member in members.iter_mut() {
            // Check if there are Removes
            if !member.removes.is_empty() {
                // Delete all Updates when a Remove is found
                member.updates = Vec::new();
                // Only keep the last Remove
                valid_proposals.insert(member.removes.last().unwrap().proposal_reference());
            }
            if !member.updates.is_empty() {
                // Only keep the last Update
                valid_proposals.insert(member.updates.last().unwrap().proposal_reference());
            }
        }
        // Only retain `adds` and `valid_proposals`
        let mut proposal_queue = ProposalQueue::default();
        for proposal_reference in adds.iter().chain(valid_proposals.iter()) {
            proposal_queue.add(match proposal_pool.get(proposal_reference) {
                Some(queued_proposal) => queued_proposal.clone(),
                None => return Err(ProposalQueueError::ProposalNotFound),
            });
        }
        Ok((proposal_queue, contains_own_updates))
    }
pub ( crate ) fn filter_proposals ( ciphersuite : & Ciphersuite , backend : & impl OpenMlsCryptoProvider , proposals_by_reference : & ' a [ & MlsPlaintext ] , proposals_by_value : & ' a [ & Proposal ] , own_index : LeafIndex , tree_size : LeafIndex , ) -> Result < ( Self , bool ) , ProposalQueueError > { # [ derive ( Clone ) ] struct Member < ' a > { updates : Vec < QueuedProposal < ' a > > , removes : Vec < QueuedProposal < ' a > > , } let mut members : Vec < Member > = vec ! [ Member { updates vec [ ] removes vec [ ] } tree_size as_usize ( ) ] ; let mut adds : HashSet < ProposalReference > = HashSet :: new ( ) ; let mut valid_proposals : HashSet < ProposalReference > = HashSet :: new ( ) ; let mut proposal_pool : HashMap < ProposalReference , QueuedProposal > = HashMap :: new ( ) ; let mut contains_own_updates = false ; let sender = Sender { sender_type : SenderType :: Member , sender : own_index , } ; // Aggregate both proposal types to a common iterator // We checked earlier that only proposals can end up here let mut queued_proposal_list = proposals_by_reference . iter ( ) . map ( | & mls_plaintext | { QueuedProposal :: from_mls_plaintext ( ciphersuite , backend , mls_plaintext ) } ) . collect :: < Result < Vec < QueuedProposal > , _ > > ( ) ? ; queued_proposal_list . extend ( proposals_by_value . iter ( ) . map ( | & p | QueuedProposal :: from_proposal_and_sender ( ciphersuite , backend , p , sender ) ) . collect :: < Result < Vec < QueuedProposal > , _ > > ( ) ? . into_iter ( ) , ) ; // Parse proposals and build adds and member list for queued_proposal in queued_proposal_list { match queued_proposal . proposal . proposal_type ( ) { ProposalType :: Add => { adds . insert ( queued_proposal . proposal_reference ( ) ) ; proposal_pool . insert ( queued_proposal . proposal_reference ( ) , queued_proposal ) ; } ProposalType :: Update => { let sender_index = queued_proposal . sender . sender . as_usize ( ) ; if sender_index != own_index . as_usize ( ) { members [ sender_index ] . updates . push ( queued_proposal . clone ( ) ) ; } else { contains_own_updates = true ; } let proposal_reference = queued_proposal . proposal_reference ( ) ; proposal_pool . insert ( proposal_reference , queued_proposal ) ; } ProposalType :: Remove => { let removed_index = queued_proposal . proposal . as_remove ( ) . unwrap ( ) . removed as usize ; if removed_index < tree_size . as_usize ( ) { members [ removed_index ] . updates . push ( queued_proposal . clone ( ) ) ; } let proposal_reference = queued_proposal . proposal_reference ( ) ; proposal_pool . insert ( proposal_reference , queued_proposal ) ; } ProposalType :: Presharedkey => { valid_proposals . insert ( queued_proposal . proposal_reference ( ) ) ; proposal_pool . insert ( queued_proposal . proposal_reference ( ) , queued_proposal ) ; } ProposalType :: Reinit => { // TODO #141: Only keep one ReInit proposal_pool . insert ( queued_proposal . proposal_reference ( ) , queued_proposal ) ; } } } // Check for presence of Removes and delete Updates for member in members . iter_mut ( ) { // Check if there are Removes if ! member . removes . is_empty ( ) { // Delete all Updates when a Remove is found member . updates = Vec :: new ( ) ; // Only keep the last Remove valid_proposals . insert ( member . removes . last ( ) . unwrap ( ) . proposal_reference ( ) ) ; } if ! member . updates . is_empty ( ) { // Only keep the last Update valid_proposals . insert ( member . updates . last ( ) . unwrap ( ) . proposal_reference ( ) ) ; } } // Only retain `adds` and `valid_proposals` let mut proposal_queue = ProposalQueue :: default ( ) ; for proposal_reference in adds . iter ( ) . chain ( valid_proposals . iter ( ) ) { proposal_queue . add ( match proposal_pool . get ( proposal_reference ) { Some ( queued_proposal ) => queued_proposal . clone ( ) , None => return Err ( ProposalQueueError :: ProposalNotFound ) , } ) ; } Ok ( ( proposal_queue , contains_own_updates ) ) }
Filters received proposals
11.2 Commit
If there are multiple proposals that apply to the same leaf,
the committer chooses one and includes only that one in the Commit,
considering the rest invalid.
Filters received proposals 11 . 2 Commit If there are multiple proposals that apply to the same leaf the committer chooses one and includes only that one in the Commit considering the rest invalid .
ciphersuite
&Ciphersuite
backend
&impl OpenMlsCryptoProvider
proposals_by_reference
&'a [&MlsPlaintext]
proposals_by_value
&'a [&Proposal]
own_index
LeafIndex
tree_size
LeafIndex
ciphersuite
&Ciphersuite
backend
&impl OpenMlsCryptoProvider
proposals_by_reference
&'a [&MlsPlaintext]
proposals_by_value
&'a [&Proposal]
own_index
LeafIndex
tree_size
LeafIndex