main: start of address index

Adds a configuration option for addressindex to search for txids by address. Includes
an additional rpc method for getting the txids for an address.

src/rpcmisc.cpp

@@ -396,3 +396,39 @@ UniValue setmocktime(const UniValue& params, bool fHelp)
 
     return NullUniValue;
 }
+
+UniValue getaddresstxids(const UniValue& params, bool fHelp)
+{
+    if (fHelp || params.size() != 1)
+        throw runtime_error(
+            "getaddresstxids\n"
+            "\nReturns the txids for an address (requires addressindex to be enabled).\n"
+            "\nResult\n"
+            "[\n"
+            "  \"transactionid\"  (string) The transaction id\n"
+            "  ,...\n"
+            "]\n"
+        );
+
+    CBitcoinAddress address(params[0].get_str());
+    if (!address.IsValid())
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid address");
+
+    CKeyID keyID;
+    address.GetKeyID(keyID);
+
+    int type = 1; // TODO
+    std::vector<std::pair<CAddressIndexKey, CAmount> > addressIndex;
+
+    LOCK(cs_main);
+
+    if (!GetAddressIndex(keyID, type, addressIndex))
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "No information available for address");
+
+    UniValue result(UniValue::VARR);
+    for (std::vector<std::pair<CAddressIndexKey, CAmount> >::const_iterator it=addressIndex.begin(); it!=addressIndex.end(); it++)
+        result.push_back(it->first.txhash.GetHex());
+
+    return result;
+
+}