text: /*
   * Copyright (c) 2015 Cryptonomex, Inc., and contributors.
   *
   * The MIT License
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in
   * all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   * THE SOFTWARE.
   */
  #include <graphene/chain/exceptions.hpp>
  #include <graphene/chain/protocol/confidential.hpp>
  #include <graphene/chain/confidential_evaluator.hpp>
  #include <graphene/chain/confidential_object.hpp>
  #include <graphene/chain/database.hpp>
  #include <graphene/chain/fba_accumulator_id.hpp>
  #include <graphene/chain/hardfork.hpp>
  
  #include <fc/smart_ref_impl.hpp>
  
  namespace graphene { namespace chain {
  
  void_result transfer_to_blind_evaluator::do_evaluate( const transfer_to_blind_operation& o )
  { try {
     const auto& d = db();
  
     const auto& atype = o.amount.asset_id(db()); 
     FC_ASSERT( atype.allow_confidential() );
     FC_ASSERT( !atype.is_transfer_restricted() );
     FC_ASSERT( !(atype.options.flags & white_list) );
  
     for( const auto& out : o.outputs )
     {
        for( const auto& a : out.owner.account_auths )
           a.first(d); // verify all accounts exist and are valid
     }
     return void_result();
  } FC_CAPTURE_AND_RETHROW( (o) ) }
  
  
  void_result transfer_to_blind_evaluator::do_apply( const transfer_to_blind_operation& o ) 
  { try {
     db().adjust_balance( o.from, -o.amount ); 
  
     const auto& add = o.amount.asset_id(db()).dynamic_asset_data_id(db());  // verify fee is a legit asset 
     db().modify( add, [&]( asset_dynamic_data_object& obj ){
        obj.confidential_supply += o.amount.amount;
        FC_ASSERT( obj.confidential_supply >= 0 );
     });
     for( const auto& out : o.outputs )
     {
        db().create<blinded_balance_object>( [&]( blinded_balance_object& obj ){
            obj.asset_id   = o.amount.asset_id;
            obj.owner      = out.owner;
            obj.commitment = out.commitment;
        });
     }
     return void_result();
  } FC_CAPTURE_AND_RETHROW( (o) ) }
  
  void transfer_to_blind_evaluator::pay_fee()
  {
     if( db().head_block_time() >= HARDFORK_563_TIME )
        pay_fba_fee( fba_accumulator_id_transfer_to_blind );
     else
        generic_evaluator::pay_fee();
  }
  
  void_result transfer_from_blind_evaluator::do_evaluate( const transfer_from_blind_operation& o )
  { try {
     const auto& d = db();
     o.fee.asset_id(d);  // verify fee is a legit asset 
     const auto& bbi = d.get_index_type<blinded_balance_index>();
     const auto& cidx = bbi.indices().get<by_commitment>();
     for( const auto& in : o.inputs )
     {
        auto itr = cidx.find( in.commitment );
        FC_ASSERT( itr != cidx.end() );
        FC_ASSERT( itr->asset_id == o.fee.asset_id );
        FC_ASSERT( itr->owner == in.owner );
     }
     return void_result();
  } FC_CAPTURE_AND_RETHROW( (o) ) }
  
  void_result transfer_from_blind_evaluator::do_apply( const transfer_from_blind_operation& o ) 
  { try {
     db().adjust_balance( o.fee_payer(), o.fee ); 
     db().adjust_balance( o.to, o.amount ); 
     const auto& bbi = db().get_index_type<blinded_balance_index>();
     const auto& cidx = bbi.indices().get<by_commitment>();
     for( const auto& in : o.inputs )
     {
        auto itr = cidx.find( in.commitment );
        FC_ASSERT( itr != cidx.end() );
        db().remove( *itr );
     }
     const auto& add = o.amount.asset_id(db()).dynamic_asset_data_id(db());  // verify fee is a legit asset 
     db().modify( add, [&]( asset_dynamic_data_object& obj ){
        obj.confidential_supply -= o.amount.amount + o.fee.amount;
        FC_ASSERT( obj.confidential_supply >= 0 );
     });
     return void_result();
  } FC_CAPTURE_AND_RETHROW( (o) ) }
  
  void transfer_from_blind_evaluator::pay_fee()
  {
     if( db().head_block_time() >= HARDFORK_563_TIME )
        pay_fba_fee( fba_accumulator_id_transfer_from_blind );
     else
        generic_evaluator::pay_fee();
  }
  
  void_result blind_transfer_evaluator::do_evaluate( const blind_transfer_operation& o )
  { try {
     const auto& d = db();
     o.fee.asset_id(db());  // verify fee is a legit asset 
     const auto& bbi = db().get_index_type<blinded_balance_index>();
     const auto& cidx = bbi.indices().get<by_commitment>();
     for( const auto& out : o.outputs )
     {
        for( const auto& a : out.owner.account_auths )
           a.first(d); // verify all accounts exist and are valid
     }
     for( const auto& in : o.inputs )
     {
        auto itr = cidx.find( in.commitment );
        GRAPHENE_ASSERT( itr != cidx.end(), blind_transfer_unknown_commitment, "", ("commitment",in.commitment) );
        FC_ASSERT( itr->asset_id == o.fee.asset_id );
        FC_ASSERT( itr->owner == in.owner );
     }
     return void_result();
  } FC_CAPTURE_AND_RETHROW( (o) ) }
  
  void_result blind_transfer_evaluator::do_apply( const blind_transfer_operation& o ) 
  { try {
     db().adjust_balance( o.fee_payer(), o.fee ); // deposit the fee to the temp account
     const auto& bbi = db().get_index_type<blinded_balance_index>();
     const auto& cidx = bbi.indices().get<by_commitment>();
     for( const auto& in : o.inputs )
     {
        auto itr = cidx.find( in.commitment );
        GRAPHENE_ASSERT( itr != cidx.end(), blind_transfer_unknown_commitment, "", ("commitment",in.commitment) );
        db().remove( *itr );
     }
     for( const auto& out : o.outputs )
     {
        db().create<blinded_balance_object>( [&]( blinded_balance_object& obj ){
            obj.asset_id   = o.fee.asset_id;
            obj.owner      = out.owner;
            obj.commitment = out.commitment;
        });
     }
     const auto& add = o.fee.asset_id(db()).dynamic_asset_data_id(db());  
     db().modify( add, [&]( asset_dynamic_data_object& obj ){
        obj.confidential_supply -= o.fee.amount;
        FC_ASSERT( obj.confidential_supply >= 0 );
     });
  
     return void_result();
  } FC_CAPTURE_AND_RETHROW( (o) ) }
  
  void blind_transfer_evaluator::pay_fee()
  {
     if( db().head_block_time() >= HARDFORK_563_TIME )
        pay_fba_fee( fba_accumulator_id_blind_transfer );
     else
        generic_evaluator::pay_fee();
  }
  
  } } // graphene::chain
  