New DB API, list all NFTs, list NFTs by owner

.gitlab-ci.yml

@@ -30,26 +30,4 @@ test:
     - ./tests/chain_test
     - ./tests/cli_test
   tags:
-    - builder
-
-code_quality:
-  stage: test
-  image: docker:stable
-  variables:
-    DOCKER_DRIVER: overlay2
-  allow_failure: true
-  services:
-    - docker:stable-dind
-  script:
-    - export SP_VERSION=$(echo "$CI_SERVER_VERSION" | sed 's/^\([0-9]*\)\.\([0-9]*\).*/\1-\2-stable/')
-    - docker run
-        --env SOURCE_CODE="$PWD"
-        --volume "$PWD":/code
-        --volume /var/run/docker.sock:/var/run/docker.sock
-        "registry.gitlab.com/gitlab-org/security-products/codequality:$SP_VERSION" /code
-  artifacts:
-    paths: [gl-code-quality-report.json]
-    expire_in: 1 week
-  except:
-    variables:
-      - $CODE_QUALITY_DISABLED
+    - builder

CMakeLists.txt

@@ -135,7 +135,7 @@ else( WIN32 ) # Apple AND Linux
     endif( APPLE )
 
     if( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" )
-        set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-builtin-memcmp -Wno-class-memaccess -Wno-parentheses -Wno-terminate -Wno-invalid-offsetof" )
+        set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-builtin-memcmp -Wno-parentheses -Wno-terminate -Wno-invalid-offsetof" )
     elseif( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" )
         if( CMAKE_CXX_COMPILER_VERSION VERSION_EQUAL 4.0.0 OR CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 4.0.0 )
             set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-invalid-partial-specialization" )

libraries/app/database_api.cpp

@@ -184,6 +184,20 @@ class database_api_impl : public std::enable_shared_from_this<database_api_impl>
       // gpos
       gpos_info get_gpos_info(const account_id_type account) const;
 
+      // NFT
+      uint64_t nft_get_balance(const account_id_type owner) const;
+      optional<account_id_type> nft_owner_of(const nft_id_type token_id) const;
+      optional<account_id_type> nft_get_approved(const nft_id_type token_id) const;
+      bool nft_is_approved_for_all(const account_id_type owner, const account_id_type operator_) const;
+      string nft_get_name(const nft_metadata_id_type nft_metadata_id) const;
+      string nft_get_symbol(const nft_metadata_id_type nft_metadata_id) const;
+      string nft_get_token_uri(const nft_id_type token_id) const;
+      uint64_t nft_get_total_supply(const nft_metadata_id_type nft_metadata_id) const;
+      nft_object nft_token_by_index(const nft_metadata_id_type nft_metadata_id, const uint64_t token_idx) const;
+      nft_object nft_token_of_owner_by_index(const nft_metadata_id_type nft_metadata_id, const account_id_type owner, const uint64_t token_idx) const;
+      vector<nft_object> nft_get_all_tokens() const;
+      vector<nft_object> nft_get_tokens_by_owner(const account_id_type owner) const;
+
    //private:
       const account_object* get_account_from_string( const std::string& name_or_id,
                                                      bool throw_if_not_found = true ) const;
@@ -2240,6 +2254,7 @@ graphene::app::gpos_info database_api::get_gpos_info(const account_id_type accou
    return my->get_gpos_info(account);
 
 }
+
 graphene::app::gpos_info database_api_impl::get_gpos_info(const account_id_type account) const
 {
    FC_ASSERT( _db.head_block_time() > HARDFORK_GPOS_TIME);  //Can be deleted after GPOS hardfork time
@@ -2303,6 +2318,202 @@ graphene::app::gpos_info database_api_impl::get_gpos_info(const account_id_type
    return result;
 }
 
+//////////////////////////////////////////////////////////////////////
+//                                                                  //
+// NFT methods                                                      //
+//                                                                  //
+//////////////////////////////////////////////////////////////////////
+
+uint64_t database_api::nft_get_balance(const account_id_type owner) const
+{
+   return my->nft_get_balance(owner);
+}
+
+uint64_t database_api_impl::nft_get_balance(const account_id_type owner) const
+{
+   const auto &idx_nft = _db.get_index_type<nft_index>().indices().get<by_owner>();
+   const auto &idx_nft_range = idx_nft.equal_range(owner);
+   return std::distance(idx_nft_range.first, idx_nft_range.second);
+}
+
+optional<account_id_type> database_api::nft_owner_of(const nft_id_type token_id) const
+{
+   return my->nft_owner_of(token_id);
+}
+
+optional<account_id_type> database_api_impl::nft_owner_of(const nft_id_type token_id) const
+{
+   const auto &idx_nft = _db.get_index_type<nft_index>().indices().get<by_id>();
+   auto itr_nft = idx_nft.find(token_id);
+   if (itr_nft != idx_nft.end()) {
+       return itr_nft->owner;
+   }
+   return {};
+}
+
+optional<account_id_type> database_api::nft_get_approved(const nft_id_type token_id) const
+{
+   return my->nft_get_approved(token_id);
+}
+
+optional<account_id_type> database_api_impl::nft_get_approved(const nft_id_type token_id) const
+{
+   const auto &idx_nft = _db.get_index_type<nft_index>().indices().get<by_id>();
+   auto itr_nft = idx_nft.find(token_id);
+   if (itr_nft != idx_nft.end()) {
+       return itr_nft->approved;
+   }
+   return {};
+}
+
+bool database_api::nft_is_approved_for_all(const account_id_type owner, const account_id_type operator_) const
+{
+   return my->nft_is_approved_for_all(owner, operator_);
+}
+
+bool database_api_impl::nft_is_approved_for_all(const account_id_type owner, const account_id_type operator_) const
+{
+   const auto &idx_nft = _db.get_index_type<nft_index>().indices().get<by_owner>();
+   const auto &idx_nft_range = idx_nft.equal_range(owner);
+   if (std::distance(idx_nft_range.first, idx_nft_range.second) == 0) {
+       return false;
+   }
+   bool result = true;
+   std::for_each(idx_nft_range.first, idx_nft_range.second, [&](const nft_object &obj) {
+      result = result && (obj.approved == operator_);
+   });
+   return result;
+}
+
+string database_api::nft_get_name(const nft_metadata_id_type nft_metadata_id) const
+{
+   return my->nft_get_name(nft_metadata_id);
+}
+
+string database_api_impl::nft_get_name(const nft_metadata_id_type nft_metadata_id) const
+{
+   const auto &idx_nft_md = _db.get_index_type<nft_metadata_index>().indices().get<by_id>();
+   auto itr_nft_md = idx_nft_md.find(nft_metadata_id);
+   if (itr_nft_md != idx_nft_md.end()) {
+       return itr_nft_md->name;
+   }
+   return "";
+}
+
+string database_api::nft_get_symbol(const nft_metadata_id_type nft_metadata_id) const
+{
+   return my->nft_get_symbol(nft_metadata_id);
+}
+
+string database_api_impl::nft_get_symbol(const nft_metadata_id_type nft_metadata_id) const
+{
+   const auto &idx_nft_md = _db.get_index_type<nft_metadata_index>().indices().get<by_id>();
+   auto itr_nft_md = idx_nft_md.find(nft_metadata_id);
+   if (itr_nft_md != idx_nft_md.end()) {
+       return itr_nft_md->symbol;
+   }
+   return "";
+}
+
+string database_api::nft_get_token_uri(const nft_id_type token_id) const
+{
+   return my->nft_get_token_uri(token_id);
+}
+
+string database_api_impl::nft_get_token_uri(const nft_id_type token_id) const
+{
+   const auto &idx_nft = _db.get_index_type<nft_index>().indices().get<by_id>();
+   auto itr_nft = idx_nft.find(token_id);
+   if (itr_nft != idx_nft.end()) {
+      const auto &idx_nft_md = _db.get_index_type<nft_metadata_index>().indices().get<by_id>();
+      auto itr_nft_md = idx_nft_md.find(itr_nft->nft_metadata_id);
+      if (itr_nft_md != idx_nft_md.end()) {
+         return itr_nft_md->base_uri + itr_nft->token_uri;
+      }
+   }
+   return "";
+}
+
+uint64_t database_api::nft_get_total_supply(const nft_metadata_id_type nft_metadata_id) const
+{
+   return my->nft_get_total_supply(nft_metadata_id);
+}
+
+uint64_t database_api_impl::nft_get_total_supply(const nft_metadata_id_type nft_metadata_id) const
+{
+   const auto &idx_nft_md = _db.get_index_type<nft_metadata_index>().indices().get<by_id>();
+   return idx_nft_md.size();
+}
+
+nft_object database_api::nft_token_by_index(const nft_metadata_id_type nft_metadata_id, const uint64_t token_idx) const
+{
+   return my->nft_token_by_index(nft_metadata_id, token_idx);
+}
+
+nft_object database_api_impl::nft_token_by_index(const nft_metadata_id_type nft_metadata_id, const uint64_t token_idx) const
+{
+   const auto &idx_nft = _db.get_index_type<nft_index>().indices().get<by_metadata>();
+   auto idx_nft_range = idx_nft.equal_range(nft_metadata_id);
+   uint64_t tmp_idx = token_idx;
+   for (auto itr = idx_nft_range.first; itr != idx_nft_range.second; ++itr) {
+      if (tmp_idx == 0) {
+          return *itr;
+      }
+      tmp_idx = tmp_idx - 1;
+   }
+   return {};
+}
+
+nft_object database_api::nft_token_of_owner_by_index(const nft_metadata_id_type nft_metadata_id, const account_id_type owner, const uint64_t token_idx) const
+{
+   return my->nft_token_of_owner_by_index(nft_metadata_id, owner, token_idx);
+}
+
+nft_object database_api_impl::nft_token_of_owner_by_index(const nft_metadata_id_type nft_metadata_id, const account_id_type owner, const uint64_t token_idx) const
+{
+   const auto &idx_nft = _db.get_index_type<nft_index>().indices().get<by_metadata_and_owner>();
+   auto idx_nft_range = idx_nft.equal_range(std::make_tuple(nft_metadata_id, owner));
+   uint64_t tmp_idx = token_idx;
+   for (auto itr = idx_nft_range.first; itr != idx_nft_range.second; ++itr) {
+      if (tmp_idx == 0) {
+          return *itr;
+      }
+      tmp_idx = tmp_idx - 1;
+   }
+   return {};
+}
+
+vector<nft_object> database_api::nft_get_all_tokens() const
+{
+   return my->nft_get_all_tokens();
+}
+
+vector<nft_object> database_api_impl::nft_get_all_tokens() const
+{
+   const auto &idx_nft = _db.get_index_type<nft_index>().indices().get<by_id>();
+   vector<nft_object> result;
+   for (auto itr = idx_nft.begin(); itr != idx_nft.end(); ++itr) {
+      result.push_back(*itr);
+   }
+   return result;
+}
+
+vector<nft_object> database_api::nft_get_tokens_by_owner(const account_id_type owner) const
+{
+   return my->nft_get_tokens_by_owner(owner);
+}
+
+vector<nft_object> database_api_impl::nft_get_tokens_by_owner(const account_id_type owner) const
+{
+   const auto &idx_nft = _db.get_index_type<nft_index>().indices().get<by_owner>();
+   auto idx_nft_range = idx_nft.equal_range(owner);
+   vector<nft_object> result;
+   for (auto itr = idx_nft_range.first; itr != idx_nft_range.second; ++itr) {
+      result.push_back(*itr);
+   }
+   return result;
+}
+
 //////////////////////////////////////////////////////////////////////
 //                                                                  //
 // Private methods                                                  //

libraries/app/include/graphene/app/database_api.hpp

@@ -48,6 +48,8 @@
 #include <graphene/chain/witness_object.hpp>
 #include <graphene/chain/tournament_object.hpp>
 
+#include <graphene/chain/nft_object.hpp>
+
 #include <graphene/market_history/market_history_plugin.hpp>
 
 #include <fc/api.hpp>
@@ -709,7 +711,95 @@ class database_api
        */
       gpos_info get_gpos_info(const account_id_type account) const;
 
+      /////////
+      // NFT //
+      /////////
+      /**
+       * @brief Returns the number of NFT owned by account
+       * @param owner Owner account ID
+       * @return Number of NFTs owned by account
+       */
+      uint64_t nft_get_balance(const account_id_type owner) const;
 
+      /**
+       * @brief Returns the NFT owner
+       * @param token_id NFT ID
+       * @return NFT owner account ID
+       */
+      optional<account_id_type> nft_owner_of(const nft_id_type token_id) const;
+
+      /**
+       * @brief Returns the NFT approved account ID
+       * @param token_id NFT ID
+       * @return NFT approved account ID
+       */
+      optional<account_id_type> nft_get_approved(const nft_id_type token_id) const;
+
+      /**
+       * @brief Returns operator approved state for all NFT owned by owner
+       * @param owner NFT owner account ID
+       * @param token_id NFT ID
+       * @return True if operator is approved for all NFT owned by owner, else False
+       */
+      bool nft_is_approved_for_all(const account_id_type owner, const account_id_type operator_) const;
+
+      /**
+       * @brief Returns NFT name from NFT metadata
+       * @param nft_metadata_id NFT metadata ID
+       * @return NFT name
+       */
+      string nft_get_name(const nft_metadata_id_type nft_metadata_id) const;
+
+      /**
+       * @brief Returns NFT symbol from NFT metadata
+       * @param nft_metadata_id NFT metadata ID
+       * @return NFT symbol
+       */
+      string nft_get_symbol(const nft_metadata_id_type nft_metadata_id) const;
+
+      /**
+       * @brief Returns NFT URI
+       * @param token_id NFT ID
+       * @return NFT URI
+       */
+      string nft_get_token_uri(const nft_id_type token_id) const;
+
+      /**
+       * @brief Returns total number of NFTs assigned to NFT metadata
+       * @param nft_metadata_id NFT metadata ID
+       * @return Total number of NFTs assigned to NFT metadata
+       */
+      uint64_t nft_get_total_supply(const nft_metadata_id_type nft_metadata_id) const;
+
+      /**
+       * @brief Returns NFT by index from NFT metadata
+       * @param nft_metadata_id NFT metadata ID
+       * @param token_idx NFT index in the list of tokens
+       * @return NFT symbol
+       */
+      nft_object nft_token_by_index(const nft_metadata_id_type nft_metadata_id, const uint64_t token_idx) const;
+
+      /**
+       * @brief Returns NFT by owner and index
+       * @param nft_metadata_id NFT metadata ID
+       * @param owner NFT owner
+       * @param token_idx NFT index in the list of tokens
+       * @return NFT object
+       */
+      nft_object nft_token_of_owner_by_index(const nft_metadata_id_type nft_metadata_id, const account_id_type owner, const uint64_t token_idx) const;
+
+      /**
+       * @brief Returns list of all available NTF's
+       * @return List of all available NFT's
+       */
+      vector<nft_object> nft_get_all_tokens() const;
+
+      /**
+       * @brief Returns NFT's owned by owner
+       * @param owner NFT owner
+       * @return List of NFT owned by owner
+       */
+      vector<nft_object> nft_get_tokens_by_owner(const account_id_type owner) const;
 
 private:
       std::shared_ptr< database_api_impl > my;
@@ -848,4 +938,19 @@ FC_API(graphene::app::database_api,
 
    // gpos
    (get_gpos_info)
+
+   // NFT
+   (nft_get_balance)
+   (nft_owner_of)
+   (nft_get_approved)
+   (nft_is_approved_for_all)
+   (nft_get_name)
+   (nft_get_symbol)
+   (nft_get_token_uri)
+   (nft_get_total_supply)
+   (nft_token_by_index)
+   (nft_token_of_owner_by_index)
+   (nft_get_all_tokens)
+   (nft_get_tokens_by_owner)
+
 )

libraries/chain/CMakeLists.txt

@@ -115,6 +115,8 @@ add_library( graphene_chain
 
              affiliate_payout.cpp
 
+             nft_evaluator.cpp
+
              ${HEADERS}
              ${PROTOCOL_HEADERS}
              "${CMAKE_CURRENT_BINARY_DIR}/include/graphene/chain/hardfork.hpp"

libraries/chain/db_init.cpp

@@ -49,7 +49,7 @@
 #include <graphene/chain/tournament_object.hpp>
 #include <graphene/chain/match_object.hpp>
 #include <graphene/chain/game_object.hpp>
-
+#include <graphene/chain/nft_object.hpp>
 
 #include <graphene/chain/sport_object.hpp>
 #include <graphene/chain/event_group_object.hpp>
@@ -77,6 +77,7 @@
 #include <graphene/chain/event_evaluator.hpp>
 #include <graphene/chain/betting_market_evaluator.hpp>
 #include <graphene/chain/tournament_evaluator.hpp>
+#include <graphene/chain/nft_evaluator.hpp>
 
 #include <graphene/chain/protocol/fee_schedule.hpp>
 
@@ -163,6 +164,9 @@ const uint8_t betting_market_object::type_id;
 const uint8_t bet_object::space_id;
 const uint8_t bet_object::type_id;
 
+const uint8_t nft_object::space_id;
+const uint8_t nft_object::type_id;
+
 const uint8_t betting_market_position_object::space_id;
 const uint8_t betting_market_position_object::type_id;
 
@@ -243,6 +247,12 @@ void database::initialize_evaluators()
    register_evaluator<lottery_reward_evaluator>();
    register_evaluator<lottery_end_evaluator>();
    register_evaluator<sweeps_vesting_claim_evaluator>();
+   register_evaluator<nft_metadata_create_evaluator>();
+   register_evaluator<nft_metadata_update_evaluator>();
+   register_evaluator<nft_mint_evaluator>();
+   register_evaluator<nft_safe_transfer_from_evaluator>();
+   register_evaluator<nft_approve_evaluator>();
+   register_evaluator<nft_set_approval_for_all_evaluator>();
 }
 
 void database::initialize_indexes()
@@ -285,6 +295,9 @@ void database::initialize_indexes()
    add_index< primary_index<match_index> >();
    add_index< primary_index<game_index> >();
 
+   add_index< primary_index<nft_metadata_index > >();
+   add_index< primary_index<nft_index > >();
+
    //Implementation object indexes
    add_index< primary_index<transaction_index                             > >();
 

libraries/chain/db_notify.cpp

@@ -293,6 +293,27 @@ struct get_impacted_account_visitor
    void operator()( const sweeps_vesting_claim_operation& op ) {
       _impacted.insert( op.account );
    }
+   void operator()( const nft_metadata_create_operation& op ) {
+      _impacted.insert( op.owner );
+   }
+   void operator()( const nft_metadata_update_operation& op ) {
+      _impacted.insert( op.owner );
+   }
+   void operator()( const nft_mint_operation& op ) {
+      _impacted.insert( op.owner );
+   }
+   void operator()( const nft_safe_transfer_from_operation& op ) {
+      _impacted.insert( op.from );
+      _impacted.insert( op.to );
+   }
+   void operator()( const nft_approve_operation& op ) {
+      _impacted.insert( op.operator_ );
+      _impacted.insert( op.approved );
+   }
+   void operator()( const nft_set_approval_for_all_operation& op ) {
+      _impacted.insert( op.owner );
+      _impacted.insert( op.operator_ );
+   }
 };
 
 void graphene::chain::operation_get_impacted_accounts( const operation& op, flat_set<account_id_type>& result )

libraries/chain/include/graphene/chain/nft_evaluator.hpp

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <graphene/chain/database.hpp>
+#include <graphene/chain/evaluator.hpp>
+#include <graphene/chain/protocol/operations.hpp>
+#include <graphene/chain/protocol/types.hpp>
+
+namespace graphene { namespace chain {
+
+   class nft_metadata_create_evaluator : public evaluator<nft_metadata_create_evaluator>
+   {
+      public:
+         typedef nft_metadata_create_operation operation_type;
+         void_result do_evaluate( const nft_metadata_create_operation& o );
+         object_id_type do_apply( const nft_metadata_create_operation& o );
+   };
+
+   class nft_metadata_update_evaluator : public evaluator<nft_metadata_update_evaluator>
+   {
+      public:
+         typedef nft_metadata_update_operation operation_type;
+         void_result do_evaluate( const nft_metadata_update_operation& o );
+         void_result do_apply( const nft_metadata_update_operation& o );
+   };
+
+   class nft_mint_evaluator : public evaluator<nft_mint_evaluator>
+   {
+      public:
+         typedef nft_mint_operation operation_type;
+         void_result do_evaluate( const nft_mint_operation& o );
+         object_id_type do_apply( const nft_mint_operation& o );
+   };
+
+   class nft_safe_transfer_from_evaluator : public evaluator<nft_safe_transfer_from_evaluator>
+   {
+      public:
+         typedef nft_safe_transfer_from_operation operation_type;
+         void_result do_evaluate( const nft_safe_transfer_from_operation& o );
+         object_id_type do_apply( const nft_safe_transfer_from_operation& o );
+   };
+
+   class nft_approve_evaluator : public evaluator<nft_approve_evaluator>
+   {
+      public:
+         typedef nft_approve_operation operation_type;
+         void_result do_evaluate( const nft_approve_operation& o );
+         object_id_type do_apply( const nft_approve_operation& o );
+   };
+
+   class nft_set_approval_for_all_evaluator : public evaluator<nft_set_approval_for_all_evaluator>
+   {
+      public:
+         typedef nft_set_approval_for_all_operation operation_type;
+         void_result do_evaluate( const nft_set_approval_for_all_operation& o );
+         void_result do_apply( const nft_set_approval_for_all_operation& o );
+   };
+
+} } // graphene::chain
+

libraries/chain/include/graphene/chain/nft_object.hpp

@@ -0,0 +1,98 @@
+#pragma once
+#include <graphene/chain/protocol/types.hpp>
+#include <graphene/db/object.hpp>
+#include <graphene/db/generic_index.hpp>
+
+namespace graphene { namespace chain {
+   using namespace graphene::db;
+
+   class nft_metadata_object : public abstract_object<nft_metadata_object>
+   {
+      public:
+         static const uint8_t space_id = protocol_ids;
+         static const uint8_t type_id  = nft_metadata_type;
+
+         account_id_type owner;
+         std::string     name;
+         std::string     symbol;
+         std::string     base_uri;
+   };
+
+   class nft_object : public abstract_object<nft_object>
+   {
+      public:
+         static const uint8_t space_id = protocol_ids;
+         static const uint8_t type_id  = nft_object_type;
+
+         nft_metadata_id_type    nft_metadata_id;
+         account_id_type         owner;
+         account_id_type         approved;
+         vector<account_id_type> approved_operators;
+         std::string             token_uri;
+   };
+
+   struct by_name;
+   struct by_symbol;
+   using nft_metadata_multi_index_type = multi_index_container<
+      nft_metadata_object,
+      indexed_by<
+         ordered_unique< tag<by_id>,
+            member<object, object_id_type, &object::id>
+         >,
+         ordered_unique< tag<by_name>,
+            member<nft_metadata_object, std::string, &nft_metadata_object::name>
+         >,
+         ordered_unique< tag<by_symbol>,
+            member<nft_metadata_object, std::string, &nft_metadata_object::symbol>
+         >
+      >
+   >;
+   using nft_metadata_index = generic_index<nft_metadata_object, nft_metadata_multi_index_type>;
+
+   struct by_metadata;
+   struct by_metadata_and_owner;
+   struct by_owner;
+   struct by_owner_and_id;
+   using nft_multi_index_type = multi_index_container<
+      nft_object,
+      indexed_by<
+         ordered_unique< tag<by_id>,
+            member<object, object_id_type, &object::id>
+         >,
+         ordered_non_unique< tag<by_metadata>,
+            member<nft_object, nft_metadata_id_type, &nft_object::nft_metadata_id>
+         >,
+         ordered_non_unique< tag<by_metadata_and_owner>,
+            composite_key<nft_object,
+               member<nft_object, nft_metadata_id_type, &nft_object::nft_metadata_id>,
+               member<nft_object, account_id_type, &nft_object::owner>
+            >
+         >,
+         ordered_non_unique< tag<by_owner>,
+            member<nft_object, account_id_type, &nft_object::owner>
+         >,
+         ordered_unique< tag<by_owner_and_id>,
+            composite_key<nft_object,
+               member<nft_object, account_id_type, &nft_object::owner>,
+               member<object, object_id_type, &object::id>
+            >
+         >
+      >
+   >;
+   using nft_index = generic_index<nft_object, nft_multi_index_type>;
+
+} } // graphene::chain
+
+FC_REFLECT_DERIVED( graphene::chain::nft_metadata_object, (graphene::db::object),
+                    (owner)
+                    (name)
+                    (symbol)
+                    (base_uri) )
+
+FC_REFLECT_DERIVED( graphene::chain::nft_object, (graphene::db::object),
+                    (nft_metadata_id)
+                    (owner)
+                    (approved)
+                    (approved_operators)
+                    (token_uri) )
+

libraries/chain/include/graphene/chain/protocol/nft_ops.hpp

@@ -0,0 +1,106 @@
+#pragma once
+#include <graphene/chain/protocol/base.hpp>
+#include <graphene/chain/protocol/types.hpp>
+
+namespace graphene { namespace chain {
+
+   struct nft_metadata_create_operation : public base_operation
+   {
+      struct fee_parameters_type { uint64_t fee = GRAPHENE_BLOCKCHAIN_PRECISION; };
+      asset fee;
+
+      account_id_type owner;
+      std::string name;
+      std::string symbol;
+      std::string base_uri;
+
+      account_id_type fee_payer()const { return owner; }
+   };
+
+   struct nft_metadata_update_operation : public base_operation
+   {
+      struct fee_parameters_type { uint64_t fee = GRAPHENE_BLOCKCHAIN_PRECISION; };
+      asset fee;
+
+      account_id_type owner;
+      nft_metadata_id_type nft_metadata_id;
+      optional<std::string> name;
+      optional<std::string> symbol;
+      optional<std::string> base_uri;
+
+      account_id_type fee_payer()const { return owner; }
+   };
+
+   struct nft_mint_operation : public base_operation
+   {
+      struct fee_parameters_type { uint64_t fee = GRAPHENE_BLOCKCHAIN_PRECISION; };
+      asset fee;
+
+      account_id_type payer;
+
+      optional<nft_metadata_id_type> nft_metadata_id;
+      account_id_type owner;
+      account_id_type approved;
+      vector<account_id_type> approved_operators;
+      std::string token_uri;
+
+      account_id_type fee_payer()const { return payer; }
+   };
+
+   struct nft_safe_transfer_from_operation : public base_operation
+   {
+      struct fee_parameters_type { uint64_t fee = GRAPHENE_BLOCKCHAIN_PRECISION; };
+      asset fee;
+
+      account_id_type operator_;
+
+      account_id_type from;
+      account_id_type to;
+      nft_id_type token_id;
+      string data;
+
+      account_id_type fee_payer()const { return operator_; }
+   };
+
+   struct nft_approve_operation : public base_operation
+   {
+      struct fee_parameters_type { uint64_t fee = GRAPHENE_BLOCKCHAIN_PRECISION; };
+      asset fee;
+
+      account_id_type operator_;
+
+      account_id_type approved;
+      nft_id_type token_id;
+
+      account_id_type fee_payer()const { return operator_; }
+   };
+
+   struct nft_set_approval_for_all_operation : public base_operation
+   {
+      struct fee_parameters_type { uint64_t fee = GRAPHENE_BLOCKCHAIN_PRECISION; };
+      asset fee;
+
+      account_id_type owner;
+
+      account_id_type operator_;
+      bool approved;
+
+      account_id_type fee_payer()const { return owner; }
+   };
+
+} } // graphene::chain
+
+FC_REFLECT( graphene::chain::nft_metadata_create_operation::fee_parameters_type, (fee) )
+FC_REFLECT( graphene::chain::nft_metadata_update_operation::fee_parameters_type, (fee) )
+FC_REFLECT( graphene::chain::nft_mint_operation::fee_parameters_type, (fee) )
+FC_REFLECT( graphene::chain::nft_safe_transfer_from_operation::fee_parameters_type, (fee) )
+FC_REFLECT( graphene::chain::nft_approve_operation::fee_parameters_type, (fee) )
+FC_REFLECT( graphene::chain::nft_set_approval_for_all_operation::fee_parameters_type, (fee) )
+
+FC_REFLECT( graphene::chain::nft_metadata_create_operation, (fee) (owner) (name) (symbol) (base_uri) )
+FC_REFLECT( graphene::chain::nft_metadata_update_operation, (fee) (owner) (nft_metadata_id) (name) (symbol) (base_uri) )
+FC_REFLECT( graphene::chain::nft_mint_operation, (fee) (nft_metadata_id) (owner) (approved) (approved_operators) (token_uri) )
+FC_REFLECT( graphene::chain::nft_safe_transfer_from_operation, (fee) (operator_) (from) (to) (token_id) (data) )
+FC_REFLECT( graphene::chain::nft_approve_operation, (fee) (operator_) (approved) (token_id) )
+FC_REFLECT( graphene::chain::nft_set_approval_for_all_operation, (fee) (owner) (operator_) (approved) )
+

libraries/chain/include/graphene/chain/protocol/operations.hpp

@@ -45,6 +45,7 @@
 #include <graphene/chain/protocol/event.hpp>
 #include <graphene/chain/protocol/betting_market.hpp>
 #include <graphene/chain/protocol/tournament.hpp>
+#include <graphene/chain/protocol/nft_ops.hpp>
 
 namespace graphene { namespace chain {
 
@@ -135,7 +136,13 @@ namespace graphene { namespace chain {
             ticket_purchase_operation,
             lottery_reward_operation,
             lottery_end_operation,
-            sweeps_vesting_claim_operation
+            sweeps_vesting_claim_operation,
+            nft_metadata_create_operation,
+            nft_metadata_update_operation,
+            nft_mint_operation,
+            nft_safe_transfer_from_operation,
+            nft_approve_operation,
+            nft_set_approval_for_all_operation
          > operation;
 
    /// @} // operations group

libraries/chain/include/graphene/chain/protocol/types.hpp

@@ -171,6 +171,8 @@ namespace graphene { namespace chain {
       betting_market_group_object_type,
       betting_market_object_type,
       bet_object_type,
+      nft_metadata_type,
+      nft_object_type,
       OBJECT_TYPE_COUNT ///< Sentry value which contains the number of different object types
    };
 
@@ -230,6 +232,8 @@ namespace graphene { namespace chain {
    class betting_market_group_object;
    class betting_market_object;
    class bet_object;
+   class nft_metadata_object;
+   class nft_object;
 
    typedef object_id< protocol_ids, account_object_type,            account_object>               account_id_type;
    typedef object_id< protocol_ids, asset_object_type,              asset_object>                 asset_id_type;
@@ -256,6 +260,8 @@ namespace graphene { namespace chain {
    typedef object_id< protocol_ids, betting_market_group_object_type, betting_market_group_object> betting_market_group_id_type;
    typedef object_id< protocol_ids, betting_market_object_type,     betting_market_object>        betting_market_id_type;
    typedef object_id< protocol_ids, bet_object_type,                bet_object>                   bet_id_type;
+   typedef object_id< protocol_ids, nft_metadata_type,              nft_metadata_object>          nft_metadata_id_type;
+   typedef object_id< protocol_ids, nft_object_type,                nft_object>                   nft_id_type;
 
    // implementation types
    class global_property_object;
@@ -436,6 +442,8 @@ FC_REFLECT_ENUM( graphene::chain::object_type,
                  (betting_market_group_object_type)
                  (betting_market_object_type)
                  (bet_object_type)
+                 (nft_metadata_type)
+                 (nft_object_type)
                  (OBJECT_TYPE_COUNT)
                )
 FC_REFLECT_ENUM( graphene::chain::impl_object_type,
@@ -505,6 +513,8 @@ FC_REFLECT_TYPENAME( graphene::chain::fba_accumulator_id_type )
 FC_REFLECT_TYPENAME( graphene::chain::betting_market_position_id_type )
 FC_REFLECT_TYPENAME( graphene::chain::global_betting_statistics_id_type )
 FC_REFLECT_TYPENAME( graphene::chain::tournament_details_id_type )
+FC_REFLECT_TYPENAME( graphene::chain::nft_metadata_id_type )
+FC_REFLECT_TYPENAME( graphene::chain::nft_id_type )
 
 FC_REFLECT( graphene::chain::void_t, )
 

libraries/chain/nft_evaluator.cpp

@@ -0,0 +1,183 @@
+#include <graphene/chain/nft_evaluator.hpp>
+#include <graphene/chain/nft_object.hpp>
+
+namespace graphene { namespace chain {
+
+void_result nft_metadata_create_evaluator::do_evaluate( const nft_metadata_create_operation& op )
+{ try {
+   const auto& idx_nft_md_by_name = db().get_index_type<nft_metadata_index>().indices().get<by_name>();
+   FC_ASSERT( idx_nft_md_by_name.find(op.name) == idx_nft_md_by_name.end(), "NFT name already in use" );
+   const auto& idx_nft_md_by_symbol = db().get_index_type<nft_metadata_index>().indices().get<by_symbol>();
+   FC_ASSERT( idx_nft_md_by_symbol.find(op.symbol) == idx_nft_md_by_symbol.end(), "NFT symbol already in use" );
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+object_id_type nft_metadata_create_evaluator::do_apply( const nft_metadata_create_operation& op )
+{ try {
+   const auto& new_nft_metadata_object = db().create<nft_metadata_object>( [&]( nft_metadata_object& obj ){
+      obj.owner = op.owner;
+      obj.name = op.name;
+      obj.symbol = op.symbol;
+      obj.base_uri = op.base_uri;
+   });
+   return new_nft_metadata_object.id;
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+
+void_result nft_metadata_update_evaluator::do_evaluate( const nft_metadata_update_operation& op )
+{ try {
+   const auto& idx_nft_md = db().get_index_type<nft_metadata_index>().indices().get<by_id>();
+   auto itr_nft_md = idx_nft_md.find(op.nft_metadata_id);
+   FC_ASSERT( itr_nft_md != idx_nft_md.end(), "NFT metadata not found" );
+   FC_ASSERT( itr_nft_md->owner == op.owner, "Only owner can modify NFT metadata" );
+
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+void_result nft_metadata_update_evaluator::do_apply( const nft_metadata_update_operation& op )
+{ try {
+   db().modify(db().get(op.nft_metadata_id), [&] ( nft_metadata_object& obj ) {
+      if( op.name.valid() )
+         obj.name = *op.name;
+      if( op.symbol.valid() )
+         obj.symbol = *op.symbol;
+      if( op.base_uri.valid() )
+         obj.base_uri = *op.base_uri;
+   });
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+
+void_result nft_mint_evaluator::do_evaluate( const nft_mint_operation& op )
+{ try {
+   const auto& idx_nft_md = db().get_index_type<nft_metadata_index>().indices().get<by_id>();
+   auto itr_nft_md = idx_nft_md.find(*op.nft_metadata_id);
+   FC_ASSERT( itr_nft_md != idx_nft_md.end(), "NFT metadata not found" );
+   FC_ASSERT( itr_nft_md->owner == op.payer, "Only metadata owner can mint NFT" );
+
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+object_id_type nft_mint_evaluator::do_apply( const nft_mint_operation& op )
+{ try {
+   const auto& new_nft_object = db().create<nft_object>( [&]( nft_object& obj ){
+      obj.nft_metadata_id = *op.nft_metadata_id;
+      obj.owner = op.owner;
+      obj.approved = op.approved;
+      obj.approved_operators = op.approved_operators;
+   });
+   return new_nft_object.id;
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+
+void_result nft_safe_transfer_from_evaluator::do_evaluate( const nft_safe_transfer_from_operation& op )
+{ try {
+   const auto& idx_nft = db().get_index_type<nft_index>().indices().get<by_id>();
+   const auto& idx_acc = db().get_index_type<account_index>().indices().get<by_id>();
+
+   auto itr_nft = idx_nft.find(op.token_id);
+   FC_ASSERT( itr_nft != idx_nft.end(), "NFT does not exists" );
+
+   auto itr_operator = idx_acc.find(op.operator_);
+   FC_ASSERT( itr_operator != idx_acc.end(), "Operator account does not exists" );
+
+   auto itr_owner = idx_acc.find(itr_nft->owner);
+   FC_ASSERT( itr_owner != idx_acc.end(), "Owner account does not exists" );
+
+   auto itr_from = idx_acc.find(op.from);
+   FC_ASSERT( itr_from != idx_acc.end(), "Sender account does not exists" );
+   FC_ASSERT( itr_from->id == itr_owner->id, "Sender account is not owner of this NFT" );
+
+   auto itr_to = idx_acc.find(op.to);
+   FC_ASSERT( itr_to != idx_acc.end(), "Receiver account does not exists" );
+
+   auto itr_approved_op = std::find(itr_nft->approved_operators.begin(), itr_nft->approved_operators.end(), op.operator_);
+   FC_ASSERT( (itr_nft->owner == itr_owner->id) || (itr_nft->approved == itr_operator->id) || (itr_approved_op != itr_nft->approved_operators.end()), "Operator is not NFT owner or approved operator" );
+
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+object_id_type nft_safe_transfer_from_evaluator::do_apply( const nft_safe_transfer_from_operation& op )
+{ try {
+   const auto& idx = db().get_index_type<nft_index>().indices().get<by_id>();
+   auto itr = idx.find(op.token_id);
+   if (itr != idx.end())
+   {
+      db().modify(*itr, [&op](nft_object &obj) {
+         obj.owner = op.to;
+         obj.approved = {};
+         obj.approved_operators.clear();
+      });
+   }
+   return op.token_id;
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+
+void_result nft_approve_evaluator::do_evaluate( const nft_approve_operation& op )
+{ try {
+   const auto& idx_nft = db().get_index_type<nft_index>().indices().get<by_id>();
+   const auto& idx_acc = db().get_index_type<account_index>().indices().get<by_id>();
+
+   auto itr_nft = idx_nft.find(op.token_id);
+   FC_ASSERT( itr_nft != idx_nft.end(), "NFT does not exists" );
+
+   auto itr_owner = idx_acc.find(op.operator_);
+   FC_ASSERT( itr_owner != idx_acc.end(), "Owner account does not exists" );
+
+   auto itr_approved = idx_acc.find(op.approved);
+   FC_ASSERT( itr_approved != idx_acc.end(), "Approved account does not exists" );
+
+   auto itr_approved_op = std::find(itr_nft->approved_operators.begin(), itr_nft->approved_operators.end(), op.operator_);
+   FC_ASSERT( (itr_nft->owner == itr_owner->id) || (itr_approved_op != itr_nft->approved_operators.end()), "Sender is not NFT owner or approved operator" );
+
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+object_id_type nft_approve_evaluator::do_apply( const nft_approve_operation& op )
+{ try {
+   const auto& idx = db().get_index_type<nft_index>().indices().get<by_id>();
+   auto itr = idx.find(op.token_id);
+   if (itr != idx.end())
+   {
+      db().modify(*itr, [&op](nft_object &obj) {
+         obj.approved = op.approved;
+         //auto itr = std::find(obj.approved_operators.begin(), obj.approved_operators.end(), op.approved);
+         //if (itr == obj.approved_operators.end()) {
+         //   obj.approved_operators.push_back(op.approved);
+         //}
+      });
+   }
+   return op.token_id;
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+
+void_result nft_set_approval_for_all_evaluator::do_evaluate( const nft_set_approval_for_all_operation& op )
+{ try {
+   const auto& idx_acc = db().get_index_type<account_index>().indices().get<by_id>();
+
+   auto itr_operator = idx_acc.find(op.operator_);
+   FC_ASSERT( itr_operator != idx_acc.end(), "Operator account does not exists" );
+
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+void_result nft_set_approval_for_all_evaluator::do_apply( const nft_set_approval_for_all_operation& op )
+{ try {
+   const auto &idx = db().get_index_type<nft_index>().indices().get<by_owner>();
+   const auto &idx_range = idx.equal_range(op.owner);
+   std::for_each(idx_range.first, idx_range.second, [&](const nft_object &obj) {
+      db().modify(obj, [&op](nft_object &obj) {
+         auto itr = std::find(obj.approved_operators.begin(), obj.approved_operators.end(), op.operator_);
+         if ((op.approved) && (itr == obj.approved_operators.end())) {
+            obj.approved_operators.push_back(op.operator_);
+         }
+         if ((!op.approved) && (itr != obj.approved_operators.end())) {
+            obj.approved_operators.erase(itr);
+         }
+      });
+   });
+   return void_result();
+} FC_CAPTURE_AND_RETHROW( (op) ) }
+
+} } // graphene::chain
+

libraries/wallet/include/graphene/wallet/wallet.hpp

@@ -1895,6 +1895,143 @@ class wallet_api
                                                 bool is_gpos,
                                                 bool broadcast);
 
+      /////////
+      // NFT //
+      /////////
+      /**
+       * @brief Creates NFT metadata
+       * @param owner_account_id_or_name Owner account ID or name
+       * @param name Name of the token group
+       * @param symbol Symbol of the token group
+       * @param base_uri Base URI for token URI
+       * @param broadcast  true to broadcast transaction to the network
+       * @return Signed transaction transfering the funds
+       */
+      signed_transaction nft_metadata_create(string owner_account_id_or_name,
+                                    string name,
+                                    string symbol,
+                                    string base_uri,
+                                    bool broadcast);
+
+      /**
+       * @brief Updates NFT metadata
+       * @param owner_account_id_or_name Owner account ID or name
+       * @param name Name of the token group
+       * @param symbol Symbol of the token group
+       * @param base_uri Base URI for token URI
+       * @param broadcast  true to broadcast transaction to the network
+       * @return Signed transaction transfering the funds
+       */
+      signed_transaction nft_metadata_update(string owner_account_id_or_name,
+                                    string name,
+                                    string symbol,
+                                    string base_uri,
+                                    bool broadcast);
+
+      /**
+       * @brief Creates NFT
+       * @param metadata_owner_account_id_or_name NFT metadata owner account ID or name
+       * @param metadata_id NFT metadata ID to which token will belong
+       * @param owner_account_id_or_name Owner account ID or name
+       * @param approved_account_id_or_name Approved account ID or name
+       * @param token_uri Token URI (Will be combined with metadata base_uri if its not empty)
+       * @param broadcast  true to broadcast transaction to the network
+       * @return Signed transaction transfering the funds
+       */
+      signed_transaction nft_create(string metadata_owner_account_id_or_name,
+                                    nft_metadata_id_type metadata_id,
+                                    string owner_account_id_or_name,
+                                    string approved_account_id_or_name,
+                                    string token_uri,
+                                    bool broadcast);
+
+      /**
+       * @brief Returns the number of NFT owned by account
+       * @param owner_account_id_or_name Owner account ID or name
+       * @return Number of NFTs owned by account
+       */
+      uint64_t nft_get_balance(string owner_account_id_or_name) const;
+
+      /**
+       * @brief Returns the NFT owner
+       * @param token_id NFT ID
+       * @return NFT owner account ID
+       */
+      optional<account_id_type> nft_owner_of(const nft_id_type token_id) const;
+
+      /**
+       * @brief Transfers NFT safely
+       * @param operator_account_id_or_name Operators account ID or name
+       * @param from_account_id_or_name Senders account ID or name
+       * @param to_account_id_or_name Receivers account ID or name
+       * @param token_id NFT ID
+       * @param data Non mandatory data
+       * @param broadcast  true to broadcast transaction to the network
+       * @return Signed transaction transfering NFT
+       */
+      signed_transaction nft_safe_transfer_from(string operator_account_id_or_name,
+                                                string from_account_id_or_name,
+                                                string to_account_id_or_name,
+                                                nft_id_type token_id,
+                                                string data,
+                                                bool broadcast);
+
+      /**
+       * @brief Transfers NFT
+       * @param operator_account_id_or_name Operators account ID or name
+       * @param from_account_id_or_name Senders account ID or name
+       * @param to_account_id_or_name Receivers account ID or name
+       * @param token_id NFT ID
+       * @param broadcast  true to broadcast transaction to the network
+       * @return Signed transaction transfering NFT
+       */
+      signed_transaction nft_transfer_from(string operator_account_id_or_name,
+                                           string from_account_id_or_name,
+                                           string to_account_id_or_name,
+                                           nft_id_type token_id,
+                                           bool broadcast);
+
+      /**
+       * @brief Sets approved account for NFT
+       * @param operator_account_id_or_name Operators account ID or name
+       * @param approved_account_id_or_name Senders account ID or name
+       * @param token_id NFT ID
+       * @param broadcast  true to broadcast transaction to the network
+       * @return Signed transaction setting approving account for NFT
+       */
+      signed_transaction nft_approve(string operator_account_id_or_name,
+                                     string approved_account_id_or_name,
+                                     nft_id_type token_id,
+                                     bool broadcast);
+
+      /**
+       * @brief Sets approval for all NFT owned by owner
+       * @param owner_account_id_or_name Owner account ID or name
+       * @param operator_account_id_or_name Operator account ID or name
+       * @param approved true if approved
+       * @param broadcast  true to broadcast transaction to the network
+       * @return Signed transaction setting approvals for all NFT owned by owner
+       */
+      signed_transaction nft_set_approval_for_all(string owner_account_id_or_name,
+                                                  string operator_account_id_or_name,
+                                                  bool approved,
+                                                  bool broadcast);
+
+      /**
+       * @brief Returns the NFT approved account ID
+       * @param token_id NFT ID
+       * @return NFT approved account ID
+       */
+      optional<account_id_type> nft_get_approved(const nft_id_type token_id) const;
+
+      /**
+       * @brief Returns operator approved state for all NFT owned by owner
+       * @param owner NFT owner account ID
+       * @param token_id NFT ID
+       * @return True if operator is approved for all NFT owned by owner, else False
+       */
+      bool nft_is_approved_for_all(string owner_account_id_or_name, string operator_account_id_or_name) const;
+
       void dbg_make_uia(string creator, string symbol);
       void dbg_make_mia(string creator, string symbol);
       void dbg_push_blocks( std::string src_filename, uint32_t count );
@@ -2145,6 +2282,14 @@ FC_API( graphene::wallet::wallet_api,
         (tournament_leave)
         (rps_throw)
         (create_vesting_balance)
+        (nft_get_balance)
+        (nft_owner_of)
+        (nft_safe_transfer_from)
+        (nft_transfer_from)
+        (nft_approve)
+        (nft_set_approval_for_all)
+        (nft_get_approved)
+        (nft_is_approved_for_all)
         (get_upcoming_tournaments)
         (get_tournaments)
         (get_tournaments_by_state)

libraries/wallet/wallet.cpp

@@ -6157,6 +6157,176 @@ signed_transaction wallet_api::create_vesting_balance(string owner,
    return my->sign_transaction( trx, broadcast );
 }
 
+signed_transaction wallet_api::nft_metadata_create(string owner_account_id_or_name,
+                                                   string name,
+                                                   string symbol,
+                                                   string base_uri,
+                                                   bool broadcast)
+{
+   account_object owner_account = my->get_account(owner_account_id_or_name);
+
+   nft_metadata_create_operation op;
+   op.owner = owner_account.id;
+   op.name = name;
+   op.symbol = symbol;
+   op.base_uri = base_uri;
+
+   signed_transaction trx;
+   trx.operations.push_back(op);
+   my->set_operation_fees( trx, my->_remote_db->get_global_properties().parameters.current_fees );
+   trx.validate();
+
+   return my->sign_transaction( trx, broadcast );
+}
+
+signed_transaction wallet_api::nft_metadata_update(string owner_account_id_or_name,
+                                                   string name,
+                                                   string symbol,
+                                                   string base_uri,
+                                                   bool broadcast)
+{
+   account_object owner_account = my->get_account(owner_account_id_or_name);
+
+   nft_metadata_update_operation op;
+   op.owner = owner_account.id;
+   op.name = name;
+   op.symbol = symbol;
+   op.base_uri = base_uri;
+
+   signed_transaction trx;
+   trx.operations.push_back(op);
+   my->set_operation_fees( trx, my->_remote_db->get_global_properties().parameters.current_fees );
+   trx.validate();
+
+   return my->sign_transaction( trx, broadcast );
+}
+
+signed_transaction wallet_api::nft_create(string metadata_owner_account_id_or_name,
+                                          nft_metadata_id_type metadata_id,
+                                          string owner_account_id_or_name,
+                                          string approved_account_id_or_name,
+                                          string token_uri,
+                                          bool broadcast)
+{
+   account_object metadata_owner_account = my->get_account(metadata_owner_account_id_or_name);
+   account_object owner_account = my->get_account(owner_account_id_or_name);
+   account_object approved_account = my->get_account(approved_account_id_or_name);
+
+   nft_mint_operation op;
+   op.payer = metadata_owner_account.id;
+   op.nft_metadata_id = op.nft_metadata_id;
+   op.owner = owner_account.id;
+   op.approved = approved_account.id;
+   op.token_uri = token_uri;
+
+   signed_transaction trx;
+   trx.operations.push_back(op);
+   my->set_operation_fees( trx, my->_remote_db->get_global_properties().parameters.current_fees );
+   trx.validate();
+
+   return my->sign_transaction( trx, broadcast );
+}
+
+uint64_t wallet_api::nft_get_balance(string owner_account_id_or_name) const
+{
+   account_object owner_account = my->get_account(owner_account_id_or_name);
+   return my->_remote_db->nft_get_balance(owner_account.id);
+}
+
+optional<account_id_type> wallet_api::nft_owner_of(const nft_id_type token_id) const
+{
+   return my->_remote_db->nft_owner_of(token_id);
+}
+
+signed_transaction wallet_api::nft_safe_transfer_from(string operator_account_id_or_name,
+                                                      string from_account_id_or_name,
+                                                      string to_account_id_or_name,
+                                                      nft_id_type token_id,
+                                                      string data,
+                                                      bool broadcast)
+{
+   account_object operator_account = my->get_account(operator_account_id_or_name);
+   account_object from_account = my->get_account(from_account_id_or_name);
+   account_object to_account = my->get_account(to_account_id_or_name);
+
+   nft_safe_transfer_from_operation op;
+   op.operator_ = operator_account.id;
+   op.from = from_account.id;
+   op.to = to_account.id;
+   op.token_id = token_id;
+   op.data = data;
+
+   signed_transaction trx;
+   trx.operations.push_back(op);
+   my->set_operation_fees( trx, my->_remote_db->get_global_properties().parameters.current_fees );
+   trx.validate();
+
+   return my->sign_transaction( trx, broadcast );
+}
+
+signed_transaction wallet_api::nft_transfer_from(string operator_account_id_or_name,
+                                                 string from_account_id_or_name,
+                                                 string to_account_id_or_name,
+                                                 nft_id_type token_id,
+                                                 bool broadcast)
+{
+   return nft_safe_transfer_from(operator_account_id_or_name, from_account_id_or_name, to_account_id_or_name, token_id, "", broadcast);
+}
+
+signed_transaction wallet_api::nft_approve(string operator_account_id_or_name,
+                                           string approved_account_id_or_name,
+                                           nft_id_type token_id,
+                                           bool broadcast)
+{
+   account_object operator_account = my->get_account(operator_account_id_or_name);
+   account_object approved_account = my->get_account(approved_account_id_or_name);
+
+   nft_approve_operation op;
+   op.operator_ = operator_account.id;
+   op.approved = approved_account.id;
+   op.token_id = token_id;
+
+   signed_transaction trx;
+   trx.operations.push_back(op);
+   my->set_operation_fees( trx, my->_remote_db->get_global_properties().parameters.current_fees );
+   trx.validate();
+
+   return my->sign_transaction( trx, broadcast );
+}
+
+signed_transaction wallet_api::nft_set_approval_for_all(string owner_account_id_or_name,
+                                                        string operator_account_id_or_name,
+                                                        bool approved,
+                                                        bool broadcast)
+{
+   account_object owner_account = my->get_account(owner_account_id_or_name);
+   account_object operator_account = my->get_account(operator_account_id_or_name);
+
+   nft_set_approval_for_all_operation op;
+   op.owner = owner_account.id;
+   op.operator_ = operator_account.id;
+   op.approved = approved;
+
+   signed_transaction trx;
+   trx.operations.push_back(op);
+   my->set_operation_fees( trx, my->_remote_db->get_global_properties().parameters.current_fees );
+   trx.validate();
+
+   return my->sign_transaction( trx, broadcast );
+}
+
+optional<account_id_type> wallet_api::nft_get_approved(const nft_id_type token_id) const
+{
+   return my->_remote_db->nft_get_approved(token_id);
+}
+
+bool wallet_api::nft_is_approved_for_all(string owner_account_id_or_name, string operator_account_id_or_name) const
+{
+   account_object owner_account = my->get_account(owner_account_id_or_name);
+   account_object operator_account = my->get_account(operator_account_id_or_name);
+   return my->_remote_db->nft_is_approved_for_all(owner_account.id, operator_account.id);
+}
+
 // default ctor necessary for FC_REFLECT
 signed_block_with_info::signed_block_with_info()
 {

programs/js_operation_serializer/main.cpp

@@ -43,6 +43,7 @@
 #include <graphene/chain/tournament_object.hpp>
 #include <graphene/chain/match_object.hpp>
 #include <graphene/chain/game_object.hpp>
+#include <graphene/chain/nft_object.hpp>
 
 #include <fc/smart_ref_impl.hpp>
 #include <iostream>

tests/tests/nft_tests.cpp

@@ -0,0 +1,384 @@
+#include <boost/test/unit_test.hpp>
+
+#include "../common/database_fixture.hpp"
+
+#include <graphene/chain/hardfork.hpp>
+#include <graphene/chain/nft_object.hpp>
+
+using namespace graphene::chain;
+using namespace graphene::chain::test;
+
+BOOST_FIXTURE_TEST_SUITE( nft_tests, database_fixture )
+
+BOOST_AUTO_TEST_CASE( nft_metadata_create_test ) {
+
+   BOOST_TEST_MESSAGE("nft_metadata_create_test");
+
+   generate_block();
+   set_expiration(db, trx);
+
+   ACTORS((mdowner));
+
+   generate_block();
+   set_expiration(db, trx);
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_metadata_create_operation");
+
+      nft_metadata_create_operation op;
+      op.owner = mdowner_id;
+      op.name = "NFT Test";
+      op.symbol = "NFT";
+      op.base_uri = "http://nft.example.com";
+
+      trx.operations.push_back(op);
+      sign(trx, mdowner_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   BOOST_TEST_MESSAGE("Check nft_metadata_create_operation results");
+
+   const auto& idx = db.get_index_type<nft_metadata_index>().indices().get<by_id>();
+   BOOST_REQUIRE( idx.size() == 1 );
+   auto obj = idx.begin();
+   BOOST_REQUIRE( obj != idx.end() );
+   BOOST_CHECK( obj->owner == mdowner_id );
+   BOOST_CHECK( obj->name == "NFT Test" );
+   BOOST_CHECK( obj->symbol == "NFT" );
+   BOOST_CHECK( obj->base_uri == "http://nft.example.com" );
+}
+
+
+BOOST_AUTO_TEST_CASE( nft_metadata_update_test ) {
+
+   BOOST_TEST_MESSAGE("nft_metadata_update_test");
+
+   INVOKE(nft_metadata_create_test);
+
+   GET_ACTOR(mdowner);
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_metadata_update_operation");
+
+      nft_metadata_update_operation op;
+      op.owner = mdowner_id;
+      op.name = "New NFT Test";
+      op.symbol = "New NFT";
+      op.base_uri = "new http://nft.example.com";
+
+      trx.operations.push_back(op);
+      sign(trx, mdowner_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   BOOST_TEST_MESSAGE("Check nft_metadata_update_operation results");
+
+   const auto& idx = db.get_index_type<nft_metadata_index>().indices().get<by_id>();
+   BOOST_REQUIRE( idx.size() == 1 );
+   auto obj = idx.begin();
+   BOOST_REQUIRE( obj != idx.end() );
+   BOOST_CHECK( obj->owner == mdowner_id );
+   BOOST_CHECK( obj->name == "New NFT Test" );
+   BOOST_CHECK( obj->symbol == "New NFT" );
+   BOOST_CHECK( obj->base_uri == "new http://nft.example.com" );
+}
+
+
+BOOST_AUTO_TEST_CASE( nft_mint_test ) {
+
+   BOOST_TEST_MESSAGE("nft_mint_test");
+
+   generate_block();
+   set_expiration(db, trx);
+
+   INVOKE(nft_metadata_create_test);
+
+   ACTORS((alice));
+   ACTORS((bob));
+   ACTORS((operator1));
+   ACTORS((operator2));
+
+   GET_ACTOR(mdowner);
+
+   generate_block();
+   set_expiration(db, trx);
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_mint_operation");
+
+      const auto& idx = db.get_index_type<nft_metadata_index>().indices().get<by_id>();
+      BOOST_REQUIRE( idx.size() == 1 );
+      auto nft_md_obj = idx.begin();
+
+      nft_mint_operation op;
+      op.payer = mdowner_id;
+      op.nft_metadata_id = nft_md_obj->id;
+      op.owner = alice_id;
+      op.approved = alice_id;
+      op.approved_operators.push_back(operator1_id);
+      op.approved_operators.push_back(operator2_id);
+
+      trx.operations.push_back(op);
+      sign(trx, alice_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   BOOST_TEST_MESSAGE("Check nft_mint_operation results");
+
+   const auto& idx = db.get_index_type<nft_index>().indices().get<by_id>();
+   BOOST_REQUIRE( idx.size() == 1 );
+   auto obj = idx.begin();
+   BOOST_REQUIRE( obj != idx.end() );
+   BOOST_CHECK( obj->owner == alice_id );
+   BOOST_CHECK( obj->approved_operators.size() == 2 );
+   BOOST_CHECK( obj->approved_operators.at(0) == operator1_id );
+   BOOST_CHECK( obj->approved_operators.at(1) == operator2_id );
+}
+
+
+BOOST_AUTO_TEST_CASE( nft_safe_transfer_from_test ) {
+
+   BOOST_TEST_MESSAGE("nft_safe_transfer_from_test");
+
+   INVOKE(nft_mint_test);
+
+   GET_ACTOR(alice);
+   GET_ACTOR(bob);
+
+   {
+      BOOST_TEST_MESSAGE("Check nft_safe_transfer_operation preconditions");
+
+      const auto& idx = db.get_index_type<nft_index>().indices().get<by_id>();
+      BOOST_REQUIRE( idx.size() == 1 );
+      auto obj = idx.begin();
+      BOOST_REQUIRE( obj->owner == alice_id );
+   }
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_safe_transfer_operation");
+
+      nft_safe_transfer_from_operation op;
+      op.from = alice_id;
+      op.to = bob_id;
+      op.token_id = nft_id_type(0);
+      op.data = "data";
+
+      trx.operations.push_back(op);
+      sign(trx, alice_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   {
+      BOOST_TEST_MESSAGE("Check nft_safe_transfer_operation results");
+
+      const auto& idx = db.get_index_type<nft_index>().indices().get<by_id>();
+      BOOST_REQUIRE( idx.size() == 1 );
+      auto obj = idx.begin();
+      BOOST_REQUIRE( obj->owner == bob_id );
+   }
+}
+
+BOOST_AUTO_TEST_CASE( nft_approve_operation_test ) {
+
+   BOOST_TEST_MESSAGE("nft_approve_operation_test");
+
+   INVOKE(nft_mint_test);
+
+   GET_ACTOR(alice);
+   GET_ACTOR(operator1);
+   GET_ACTOR(operator2);
+
+   ACTORS((operator3));
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_approve_operation");
+
+      nft_approve_operation op;
+      op.operator_ = alice_id;
+      op.approved = operator3_id;
+      op.token_id = nft_id_type(0);
+
+      trx.operations.push_back(op);
+      sign(trx, alice_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   {
+      BOOST_TEST_MESSAGE("Check nft_approve_operation results");
+
+      const auto& idx = db.get_index_type<nft_index>().indices().get<by_id>();
+      BOOST_REQUIRE( idx.size() == 1 );
+      auto obj = idx.begin();
+      BOOST_REQUIRE( obj != idx.end() );
+      BOOST_CHECK( obj->approved == operator3_id );
+      BOOST_CHECK( obj->approved_operators.size() == 2 );
+      BOOST_CHECK( obj->approved_operators.at(0) == operator1_id );
+      BOOST_CHECK( obj->approved_operators.at(1) == operator2_id );
+   }
+}
+
+BOOST_AUTO_TEST_CASE( nft_set_approval_for_all_test ) {
+
+   BOOST_TEST_MESSAGE("nft_set_approval_for_all_test");
+
+   generate_block();
+   set_expiration(db, trx);
+
+   ACTORS((alice));
+   ACTORS((bob));
+
+   INVOKE(nft_metadata_create_test);
+
+   GET_ACTOR(mdowner);
+
+   generate_block();
+   set_expiration(db, trx);
+
+   BOOST_TEST_MESSAGE("Create NFT assets");
+
+   const auto& idx = db.get_index_type<nft_metadata_index>().indices().get<by_id>();
+   BOOST_REQUIRE( idx.size() == 1 );
+   auto nft_md_obj = idx.begin();
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_mint_operation 1");
+
+      nft_mint_operation op;
+      op.payer = mdowner_id;
+      op.nft_metadata_id = nft_md_obj->id;
+      op.owner = alice_id;
+
+      trx.operations.push_back(op);
+      sign(trx, mdowner_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_mint_operation 2");
+
+      nft_mint_operation op;
+      op.payer = mdowner_id;
+      op.nft_metadata_id = nft_md_obj->id;
+      op.owner = bob_id;
+
+      trx.operations.push_back(op);
+      sign(trx, mdowner_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_mint_operation 3");
+
+      nft_mint_operation op;
+      op.payer = mdowner_id;
+      op.nft_metadata_id = nft_md_obj->id;
+      op.owner = alice_id;
+
+      trx.operations.push_back(op);
+      sign(trx, mdowner_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_mint_operation 4");
+
+      nft_mint_operation op;
+      op.payer = mdowner_id;
+      op.nft_metadata_id = nft_md_obj->id;
+      op.owner = bob_id;
+
+      trx.operations.push_back(op);
+      sign(trx, mdowner_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_mint_operation 5");
+
+      nft_mint_operation op;
+      op.payer = mdowner_id;
+      op.nft_metadata_id = nft_md_obj->id;
+      op.owner = alice_id;
+
+      trx.operations.push_back(op);
+      sign(trx, mdowner_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_approve_operation");
+
+      nft_set_approval_for_all_operation op;
+      op.owner = alice_id;
+      op.operator_ = bob_id;
+      op.approved = true;
+
+      trx.operations.push_back(op);
+      sign(trx, alice_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_approve_operation");
+
+      nft_set_approval_for_all_operation op;
+      op.owner = alice_id;
+      op.operator_ = bob_id;
+      op.approved = true;
+
+      trx.operations.push_back(op);
+      sign(trx, alice_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   {
+      BOOST_TEST_MESSAGE("Check nft_approve_operation results");
+
+      const auto& idx = db.get_index_type<nft_index>().indices().get<by_owner>();
+      const auto &idx_range = idx.equal_range(alice_id);
+      std::for_each(idx_range.first, idx_range.second, [&](const nft_object &obj) {
+         BOOST_CHECK( obj.approved_operators.size() == 1 );
+         BOOST_CHECK( obj.approved_operators.at(0) == bob_id );
+      });
+   }
+
+   {
+      BOOST_TEST_MESSAGE("Send nft_approve_operation");
+
+      nft_set_approval_for_all_operation op;
+      op.owner = alice_id;
+      op.operator_ = bob_id;
+      op.approved = false;
+
+      trx.operations.push_back(op);
+      sign(trx, alice_private_key);
+      PUSH_TX(db, trx, ~0);
+   }
+   generate_block();
+
+   {
+      BOOST_TEST_MESSAGE("Check nft_approve_operation results");
+
+      const auto& idx = db.get_index_type<nft_index>().indices().get<by_owner>();
+      const auto &idx_range = idx.equal_range(alice_id);
+      std::for_each(idx_range.first, idx_range.second, [&](const nft_object &obj) {
+         BOOST_CHECK( obj.approved_operators.size() == 0 );
+      });
+   }
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+