Implement BIP 23 Block Proposal

Author: luke-jr

src/rpcmining.cpp

@@ -379,6 +379,36 @@ Value getblocktemplate(const Array& params, bool fHelp)
         else
             throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode");
         lpval = find_value(oparam, "longpollid");
+
+        if (strMode == "proposal")
+        {
+            const Value& dataval = find_value(oparam, "data");
+            if (dataval.type() != str_type)
+                throw JSONRPCError(RPC_TYPE_ERROR, "Missing data String key for proposal");
+
+            CBlock block;
+            if (!DecodeHexBlk(block, dataval.get_str()))
+                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block decode failed");
+
+            uint256 hash = block.GetHash();
+            BlockMap::iterator mi = mapBlockIndex.find(hash);
+            if (mi != mapBlockIndex.end()) {
+                CBlockIndex *pindex = mi->second;
+                if (pindex->IsValid(BLOCK_VALID_SCRIPTS))
+                    return "duplicate";
+                if (pindex->nStatus & BLOCK_FAILED_MASK)
+                    return "duplicate-invalid";
+                return "duplicate-inconclusive";
+            }
+
+            CBlockIndex* const pindexPrev = chainActive.Tip();
+            // TestBlockValidity only supports blocks built on the current Tip
+            if (block.hashPrevBlock != pindexPrev->GetBlockHash())
+                return "inconclusive-not-best-prevblk";
+            CValidationState state;
+            TestBlockValidity(state, block, pindexPrev, false, true);
+            return BIP22ValidationResult(state);
+        }
     }
 
     if (strMode != "template")
@@ -481,6 +511,8 @@ Value getblocktemplate(const Array& params, bool fHelp)
     UpdateTime(pblock, pindexPrev);
     pblock->nNonce = 0;
 
+    static const Array aCaps = boost::assign::list_of("proposal");
+
     Array transactions;
     map<uint256, int64_t> setTxIndex;
     int i = 0;
@@ -527,6 +559,7 @@ Value getblocktemplate(const Array& params, bool fHelp)
     }
 
     Object result;
+    result.push_back(Pair("capabilities", aCaps));
     result.push_back(Pair("version", pblock->nVersion));
     result.push_back(Pair("previousblockhash", pblock->hashPrevBlock.GetHex()));
     result.push_back(Pair("transactions", transactions));