Add permission api

contracts/eosiolib/datastream.hpp

@@ -141,6 +141,29 @@ class datastream<size_t> {
      size_t _size;
 };
 
+/**
+ *  Serialize a public_key into a stream
+ *  @brief Serialize a public_key
+ *  @param ds stream to write
+ *  @param pubkey value to serialize
+ */
+template<typename Stream>
+inline datastream<Stream>& operator<<(datastream<Stream>& ds, const public_key pubkey) {
+  ds.write( (const char*)&pubkey, sizeof(pubkey));
+  return ds;
+}
+/**
+ *  Deserialize a public_key from a stream
+ *  @brief Deserialize a public_key
+ *  @param ds stream to read
+ *  @param pubkey destination for deserialized value
+ */
+template<typename Stream>
+inline datastream<Stream>& operator>>(datastream<Stream>& ds, public_key& pubkey) {
+  ds.read((char*)&pubkey, sizeof(pubkey));
+  return ds;
+}
+
 /**
  *  Serialize a key256 into a stream
  *  @brief Serialize a key256

contracts/eosiolib/permission.h

+/**
+ *  @file
+ *  @copyright defined in eos/LICENSE.txt
+ */
+#pragma once
+#include <eosiolib/types.h>
+
+extern "C" {
+   /**
+       *  Checks if a set of public keys can authorize an account permission
+       *  @brief Checks if a set of public keys can authorize an account permission
+       *  @param account - the account owner of the permission
+       *  @param permission - the permission name to check for authorization
+       *  @param pubkeys - a pointer to an array of public keys (public_key)
+       *  @param pubkeys_len - the lenght of the array of public keys
+       *  @return 1 if the account permission can be authorized, 0 otherwise
+   */
+   int32_t check_authorization( account_name account, permission_name permission, char* pubkeys, uint32_t pubkeys_len );
+}
+
+   

contracts/test_api/test_api.cpp

@@ -16,6 +16,7 @@
 #include "test_chain.cpp"
 #include "test_transaction.cpp"
 #include "test_checktime.cpp"
+#include "test_permission.cpp"
 
 extern "C" {
 
@@ -148,6 +149,7 @@ extern "C" {
       // test checktime
       WASM_TEST_HANDLER(test_checktime, checktime_pass);
       WASM_TEST_HANDLER(test_checktime, checktime_failure);
+
 /*      
       // test softfloat
       WASM_TEST_HANDLER(test_softfloat, test_f32_add);
@@ -157,6 +159,9 @@ extern "C" {
       WASM_TEST_HANDLER(test_softfloat, test_f32_min);
 */
 
+      // test permission
+      WASM_TEST_HANDLER(test_permission, check_authorization);
+
       //unhandled test call
       eosio_assert(false, "Unknown Test");
 

contracts/test_api/test_api.hpp

@@ -277,3 +277,7 @@ struct test_softfloat {
    static void test_f32_min();
 };
 */
+
+struct test_permission {
+  static void check_authorization();
+};

contracts/test_api/test_permission.cpp

+/**
+ * @file action_test.cpp
+ * @copyright defined in eos/LICENSE.txt
+ */
+#include <eosiolib/permission.h>
+#include <eosiolib/db.h>
+
+#include <eosiolib/eosio.hpp>
+#include <eosiolib/print.hpp>
+#include <eosiolib/compiler_builtins.h>
+#include <eosiolib/serialize.hpp>
+#include <eosiolib/action.hpp>
+
+#include "test_api.hpp"
+
+using namespace eosio;
+
+struct check_auth {
+   account_name         account;
+   permission_name      permission;
+   vector<public_key>   pubkeys;
+
+   EOSLIB_SERIALIZE( check_auth, (account)(permission)(pubkeys)  )
+};
+
+void test_permission::check_authorization() {
+  auto params = unpack_action_data<check_auth>();
+
+  uint64_t res64 = (uint64_t)::check_authorization( params.account, params.permission, 
+        (char*)params.pubkeys.data(), params.pubkeys.size()*sizeof(public_key) );
+
+  store_i64(current_receiver(), current_receiver(), current_receiver(), &res64, sizeof(uint64_t));
+}

libraries/chain/chain_controller.cpp

@@ -842,6 +842,7 @@ flat_set<public_key_type> chain_controller::get_required_keys(const transaction&
    return checker.used_keys();
 }
 
+
 class permission_visitor {
 public:
    permission_visitor(const chain_controller& controller) : _chain_controller(controller) {}
@@ -863,6 +864,7 @@ time_point chain_controller::check_authorization( const vector<action>& actions,
                                                   const flat_set<public_key_type>& provided_keys,
                                                   bool allow_unused_signatures,
                                                   flat_set<account_name> provided_accounts )const
+
 {
    auto checker = make_auth_checker( [&](const permission_level& p){ return get_permission(p).auth; },
                                      permission_visitor(*this),
@@ -963,6 +965,25 @@ time_point chain_controller::check_authorization( const vector<action>& actions,
    return max_delay;
 }
 
+bool chain_controller::check_authorization( account_name account, permission_name permission,
+                                         flat_set<public_key_type> provided_keys,
+                                         bool allow_unused_signatures)const
+{
+   auto checker = make_auth_checker( [&](const permission_level& p){ return get_permission(p).auth; },
+                                     get_global_properties().configuration.max_authority_depth,
+                                     provided_keys);
+
+   auto satisfied = checker.satisfied({account, permission});
+
+   if (satisfied && !allow_unused_signatures) {
+      EOS_ASSERT(checker.all_keys_used(), tx_irrelevant_sig,
+                 "irrelevant signatures from these keys: ${keys}",
+                 ("keys", checker.unused_keys()));
+   }
+
+   return satisfied;
+}
+
 time_point chain_controller::check_transaction_authorization(const transaction& trx,
                                                              const vector<signature_type>& signatures,
                                                              const vector<bytes>& cfd,

libraries/chain/include/eosio/chain/chain_controller.hpp

@@ -294,6 +294,16 @@ namespace eosio { namespace chain {
                                          flat_set<account_name>           provided_accounts = flat_set<account_name>()
                                          )const;
 
+         /**
+          * @param account - the account owner of the permission
+          * @param permission - the permission name to check for authorization
+          * @param provided_keys - a set of public keys
+          *
+          * @return true if the provided keys are sufficient to authorize the account permission
+          */
+         bool check_authorization( account_name account, permission_name permission,
+                                flat_set<public_key_type> provided_keys,
+                                bool allow_unused_signatures)const;
 
       private:
          const apply_handler* find_apply_handler( account_name contract, scope_name scope, action_name act )const;

libraries/chain/wasm_interface.cpp

@@ -752,6 +752,28 @@ class crypto_api : public context_aware_api {
       }
 };
 
+class permission_api : public context_aware_api {
+   public:
+      using context_aware_api::context_aware_api;
+
+      bool check_authorization( account_name account, permission_name permission, array_ptr<char> packed_pubkeys, size_t datalen) {
+
+         vector<public_key_type> pub_keys;
+         datastream<const char*> ds( packed_pubkeys, datalen );
+         while(ds.remaining()) {
+            public_key_type pub;
+            fc::raw::unpack(ds, pub);
+            pub_keys.emplace_back(pub);
+         }
+
+         return context.controller.check_authorization(
+            account, permission,
+            {pub_keys.begin(), pub_keys.end()},
+            false
+         );
+      }
+};
+
 class string_api : public context_aware_api {
    public:
       using context_aware_api::context_aware_api;
@@ -1501,6 +1523,10 @@ REGISTER_INTRINSICS(crypto_api,
    (ripemd160,              void(int, int, int)           )
 );
 
+REGISTER_INTRINSICS(permission_api,
+   (check_authorization,  int(int64_t, int64_t, int, int))
+);
+
 REGISTER_INTRINSICS(string_api,
    (assert_is_utf8,  void(int, int, int) )
 );

tests/api_tests/api_tests.cpp

@@ -81,7 +81,13 @@ struct test_chain_action {
 
 FC_REFLECT_TEMPLATE((uint64_t T), test_chain_action<T>, BOOST_PP_SEQ_NIL);
 
+struct check_auth {
+   account_name            account;
+   permission_name         permission;
+   vector<public_key_type> pubkeys;
+};
 
+FC_REFLECT(check_auth, (account)(permission)(pubkeys) );
 
 bool expect_assert_message(const fc::exception& ex, string expected) {
    BOOST_TEST_MESSAGE("LOG : " << "expected: " << expected << ", actual: " << ex.get_log().at(0).get_message());
@@ -1207,6 +1213,104 @@ BOOST_FIXTURE_TEST_CASE(types_tests, tester) { try {
 	CALL_TEST_FUNCTION( *this, "test_types", "name_class", {});
 } FC_LOG_AND_RETHROW() }
 
+/*************************************************************************************
+ * permission_tests test case
+ *************************************************************************************/
+BOOST_FIXTURE_TEST_CASE(permission_tests, tester) { try {
+   produce_blocks(1);
+   create_account( N(testapi) );
+
+   produce_blocks(1);
+   set_code( N(testapi), test_api_wast );
+   produce_blocks(1);
+
+   auto get_result_uint64 = [&]() -> uint64_t {
+      const auto& db = control->get_database();
+      const auto* t_id = db.find<table_id_object, by_code_scope_table>(boost::make_tuple(N(testapi), N(testapi), N(testapi)));
+      FC_ASSERT(t_id != 0, "Table id not found");
+
+      const auto& idx = db.get_index<key_value_index, by_scope_primary>();
+
+      auto itr = idx.lower_bound(boost::make_tuple(t_id->id));
+      FC_ASSERT( itr != idx.end() && itr->t_id == t_id->id, "lower_bound failed");
+
+      FC_ASSERT( 0 == itr->value.size(), "unexpected result size");
+      return itr->primary_key;
+   };
+
+   CALL_TEST_FUNCTION( *this, "test_permission", "check_authorization",
+      fc::raw::pack( check_auth {
+         .account    = N(testapi),
+         .permission = N(active),
+         .pubkeys    = {
+            get_public_key(N(testapi), "active")
+         }
+      })
+   );
+   BOOST_CHECK_EQUAL( uint64_t(1), get_result_uint64() );
+
+   CALL_TEST_FUNCTION( *this, "test_permission", "check_authorization",
+      fc::raw::pack( check_auth {
+         .account    = N(testapi),
+         .permission = N(active),
+         .pubkeys    = {
+            public_key_type(string("EOS7GfRtyDWWgxV88a5TRaYY59XmHptyfjsFmHHfioGNJtPjpSmGX"))
+         }
+      })
+   );
+   BOOST_CHECK_EQUAL( uint64_t(0), get_result_uint64() );
+
+   BOOST_CHECK_EXCEPTION(CALL_TEST_FUNCTION( *this, "test_permission", "check_authorization",
+      fc::raw::pack( check_auth {
+         .account    = N(testapi),
+         .permission = N(active),
+         .pubkeys    = {
+            get_public_key(N(testapi), "active"),
+            public_key_type(string("EOS7GfRtyDWWgxV88a5TRaYY59XmHptyfjsFmHHfioGNJtPjpSmGX"))
+         }
+      })), tx_irrelevant_sig,
+       [](const tx_irrelevant_sig& e) {
+         return expect_assert_message(e, "irrelevant signatures from these keys: [\"EOS7GfRtyDWWgxV88a5TRaYY59XmHptyfjsFmHHfioGNJtPjpSmGX\"]");
+      }
+   );
+
+   BOOST_CHECK_EXCEPTION(CALL_TEST_FUNCTION( *this, "test_permission", "check_authorization",
+      fc::raw::pack( check_auth {
+         .account    = N(noname),
+         .permission = N(active),
+         .pubkeys    = {
+            get_public_key(N(testapi), "active")
+         }
+      })), fc::exception,
+       [](const fc::exception& e) {
+         return expect_assert_message(e, "unknown key");
+      }
+   );
+
+   CALL_TEST_FUNCTION( *this, "test_permission", "check_authorization",
+      fc::raw::pack( check_auth {
+         .account    = N(testapi),
+         .permission = N(active),
+         .pubkeys    = {}
+      })
+   );
+   BOOST_CHECK_EQUAL( uint64_t(0), get_result_uint64() );
+
+   BOOST_CHECK_EXCEPTION(CALL_TEST_FUNCTION( *this, "test_permission", "check_authorization",
+      fc::raw::pack( check_auth {
+         .account    = N(testapi),
+         .permission = N(noname),
+         .pubkeys    = {
+            get_public_key(N(testapi), "active")
+         }
+      })), fc::exception,
+       [](const fc::exception& e) {
+         return expect_assert_message(e, "unknown key");
+      }
+   );
+
+} FC_LOG_AND_RETHROW() }
+
 #if 0
 /*************************************************************************************
  * privileged_tests test case