syntax = "proto3";

// We can't change this to swapserverrpc, it would be a breaking change because
// the package name is also contained in the HTTP URIs and old clients would
// call the wrong endpoints. Luckily with the go_package option we can have
// different golang and RPC package names to fix protobuf namespace conflicts.
package looprpc;

option go_package = "github.com/lightninglabs/loop/swapserverrpc";

service WithdrawalServer {
    // WithdrawDeposits allows to cooperatively sweep deposits that haven't
    // timed out yet to the client's wallet. The server will generate the
    // partial sigs for the client's selected deposits.
    rpc WithdrawDeposits (ServerWithdrawRequest)
        returns (ServerWithdrawResponse);
}

message ServerWithdrawRequest {
    // The deposit outpoints the client whishes to close.
    repeated ServerOutPoint outpoints = 1;

    // The nonces that the client used to generate the coop close tx sigs.
    repeated bytes client_nonces = 2;

    // The address that the client wants to sweep the static address deposits
    // to.
    string client_sweep_addr = 3;

    // The fee rate in sat/kw that the client wants to use for the sweep.
    uint64 musig_tx_fee_rate = 4;
}

message ServerWithdrawResponse {
    // The sweep sigs that the server generated for the htlc.
    repeated bytes musig2_sweep_sigs = 1;

    // The nonces that the server used to generate the sweepless sweep sigs.
    repeated bytes server_nonces = 2;
}

message ServerOutPoint {
    /*
    Raw bytes representing the transaction id.
    */
    bytes txid_bytes = 1;

    /*
    Reversed, hex-encoded string representing the transaction id.
    */
    string txid_str = 2;

    /*
    The index of the output on the transaction.
    */
    uint32 output_index = 3;
}