WIP blindpsbt rpc

src/wallet/rpcwallet.cpp

@@ -4658,6 +4658,62 @@ UniValue walletprocesspsbt(const JSONRPCRequest& request)
     return result;
 }
 
+UniValue walletblindpsbt(const JSONRPCRequest& request)
+{
+    if (!g_con_elementsmode)
+        throw std::runtime_error("PSBT operations are disabled when not in elementsmode.\n");
+
+    std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
+    CWallet* const pwallet = wallet.get();
+
+    if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
+        return NullUniValue;
+    }
+
+    if (request.fHelp || request.params.size() < 1 || request.params.size() > 4)
+        throw std::runtime_error(
+            RPCHelpMan{"walletblindpsbt",
+                "\nUpdate a PSBT with input information from our wallet and then sign inputs\n"
+                "that we can sign for.\n\n"
+                    HelpRequiringPassphrase(pwallet) + "\n",
+                {
+                    {"psbt", RPCArg::Type::STR, RPCArg::Optional::NO, "The transaction base64 string"},
+                },
+                RPCResult{
+            "{\n"
+            "  \"psbt\" : \"value\",          (string) The base64-encoded partially signed transaction\n"
+            "  ]\n"
+            "}\n"
+                },
+                RPCExamples{
+                    HelpExampleCli("walletblindpsbt", "\"psbt\"")
+                },
+            }.ToString());
+
+    RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VBOOL, UniValue::VSTR});
+
+    // Unserialize the transaction
+    PartiallySignedTransaction psbtx;
+    std::string error;
+    if (!DecodeBase64PSBT(psbtx, request.params[0].get_str(), error)) {
+        throw JSONRPCError(RPC_DESERIALIZATION_ERROR, strprintf("TX decode failed %s", error));
+    }
+
+    // TODO: Gather our input data
+
+    // TODO: Gather our issuances to blind
+
+    // Blind the PSBT
+    BlindPSBT(psbtx, our_input_data, our_issuances_to_blind);
+
+    UniValue result(UniValue::VOBJ);
+    CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+    ssTx << psbtx;
+    result.pushKV("psbt", EncodeBase64(ssTx.str()));
+
+    return result;
+}
+
 UniValue walletcreatefundedpsbt(const JSONRPCRequest& request)
 {
     if (!g_con_elementsmode)