From fade94d11a5b93113975c4b2f62a357a70d03191 Mon Sep 17 00:00:00 2001
From: MarcoFalke <*~=`'#}+{/-|&$^_@721217.xyz>
Date: Wed, 14 Feb 2024 17:13:34 +0100
Subject: [PATCH] rpc: Add ParseFeeRate helper

---
 src/rpc/util.cpp | 7 +++++++
 src/rpc/util.h   | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
index 5e2e9e5f64c..a64ec133cf0 100644
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -75,6 +75,13 @@ CAmount AmountFromValue(const UniValue& value, int decimals)
     return amount;
 }
 
+CFeeRate ParseFeeRate(const UniValue& json)
+{
+    CAmount val{AmountFromValue(json)};
+    if (val >= COIN) throw JSONRPCError(RPC_INVALID_PARAMETER, "Fee rates larger than or equal to 1BTC/kvB are not accepted");
+    return CFeeRate{val};
+}
+
 uint256 ParseHashV(const UniValue& v, std::string_view name)
 {
     const std::string& strHex(v.get_str());
diff --git a/src/rpc/util.h b/src/rpc/util.h
index e2d5ed333cc..ad3ed97b2e9 100644
--- a/src/rpc/util.h
+++ b/src/rpc/util.h
@@ -103,6 +103,11 @@ std::vector<unsigned char> ParseHexO(const UniValue& o, std::string_view strKey)
  * @returns a CAmount if the various checks pass.
  */
 CAmount AmountFromValue(const UniValue& value, int decimals = 8);
+/**
+ * Parse a json number or string, denoting BTC/kvB, into a CFeeRate (sat/kvB).
+ * Reject negative values or rates larger than 1BTC/kvB.
+ */
+CFeeRate ParseFeeRate(const UniValue& json);
 
 using RPCArgList = std::vector<std::pair<std::string, UniValue>>;
 std::string HelpExampleCli(const std::string& methodname, const std::string& args);