main: add block timestamp index

src/rpcblockchain.cpp

@@ -275,6 +275,38 @@ UniValue getrawmempool(const UniValue& params, bool fHelp)
     return mempoolToJSON(fVerbose);
 }
 
+UniValue getblockhashes(const UniValue& params, bool fHelp)
+{
+    if (fHelp || params.size() != 2)
+        throw runtime_error(
+            "getblockhashes timestamp\n"
+            "\nReturns array of hashes of blocks within the timestamp range provided.\n"
+            "\nArguments:\n"
+            "1. high         (numeric, required) The newer block timestamp\n"
+            "2. low          (numeric, required) The older block timestamp\n"
+            "\nResult:\n"
+            "["
+            "  \"hash\"         (string) The block hash\n"
+            "]"
+            "\nExamples:\n"
+        );
+
+    unsigned int high = params[0].get_int();
+    unsigned int low = params[1].get_int();
+    std::vector<uint256> blockHashes;
+
+    if (!GetTimestampIndex(high, low, blockHashes)) {
+        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "No information available for block hashes");
+    }
+
+    UniValue result(UniValue::VARR);
+    for (std::vector<uint256>::const_iterator it=blockHashes.begin(); it!=blockHashes.end(); it++) {
+        result.push_back(it->GetHex());
+    }
+
+    return result;
+}
+
 UniValue getblockhash(const UniValue& params, bool fHelp)
 {
     if (fHelp || params.size() != 1)