/*
 * 必须在 `include` 之前 `define` SDK 合约账号
 * 就是 1. 中创建的帐号 (此例中为 dappproxy)
 */
#define FIREWALL_CONTRACT "dappproxy"_n
#include "dappshield.hpp"

void apply( uint64_t receiver, uint64_t code, uint64_t action ) { \
   if( !checkenable() ) { eosio_exit(0); } \
   ...
}

void transfer( name from, name to, asset quantity, std::string memo )
{
    require_auth( from );
    eosio_assert( from != to, "cannot transfer to self" );

    if ( from == _self || to != _self ) {
        return;
    }

    transfer_proxy(from, to, quantity, memo);
}

void transfer_proxy( name from, name to, asset quantity, std::string memo )
{
    // 若 DApp 没有被启用，可在此返回并做相关处理
    if( !checkenable() ) {
    	print("DApp isn't enabled");
    	// you can return user's money here....
    	return;
    }

    capi_checksum256 txhash = get_txhash(); // 取得 txhash

    check(_self, from, txhash); // 调用 check 接口

    // check 会将检查结果在下一个 tx 返回，可以用延迟交易来获取
    transaction tx;
    tx.delay_sec = 0;
    // txhash, tapos_block_num 是用来识别我们在哪个交易中做了检查，需要带入到延迟交易中供结果搜寻
    tx.actions.emplace_back( permission_level{ _self, "active"_n }, _self, "reveal"_n, std::make_tuple(from, to, quantity, memo, txhash, tapos_block_num()) );
    tx.send(now(), _self);

    return;
}

[[eosio::action]]
void reveal( name from, name to, asset quantity, std::string memo, capi_checksum256 txhash, int tbn )
{
    // 取得检查结果
    uint32_t result = getresult(from, txhash, tbn);
    print_f("result is %\n", result);

    // 依检查结果做出处理 (可参照 dappshield.hpp)
    if(result) {
        // you should check the result code, maybe the SDK isn't registered or it's expired,
        // perhaps your DApp isn't configured, or, you know ;)
        print_f("sorry, % is not welcome\n", from);
        // you can return user's money here....
    }
}