From 1ef28b4f7cfba410fef524def1dac24bbc4086ca Mon Sep 17 00:00:00 2001
From: Gregory Sanders <gsanders87@gmail.com>
Date: Fri, 28 Feb 2020 11:27:13 -0500
Subject: Make AnalyzePSBT next role calculation simple, correct

---
 src/node/psbt.cpp | 31 +++++++++++--------------------
 1 file changed, 11 insertions(+), 20 deletions(-)

(limited to 'src/node')

diff --git a/src/node/psbt.cpp b/src/node/psbt.cpp
index 8678b33cf3..0fc19b7a11 100644
--- a/src/node/psbt.cpp
+++ b/src/node/psbt.cpp
@@ -18,9 +18,7 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
     PSBTAnalysis result;
 
     bool calc_fee = true;
-    bool all_final = true;
-    bool only_missing_sigs = true;
-    bool only_missing_final = false;
+
     CAmount in_amt = 0;
 
     result.inputs.resize(psbtx.tx->vin.size());
@@ -29,6 +27,9 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
         PSBTInput& input = psbtx.inputs[i];
         PSBTInputAnalysis& input_analysis = result.inputs[i];
 
+        // We set next role here and ratchet backwards as required
+        input_analysis.next = PSBTRole::EXTRACTOR;
+
         // Check for a UTXO
         CTxOut utxo;
         if (psbtx.GetInputUTXO(utxo, i)) {
@@ -57,7 +58,6 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
         // Check if it is final
         if (!utxo.IsNull() && !PSBTInputSigned(input)) {
             input_analysis.is_final = false;
-            all_final = false;
 
             // Figure out what is missing
             SignatureData outdata;
@@ -74,11 +74,9 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
                 if (outdata.missing_pubkeys.empty() && outdata.missing_redeem_script.IsNull() && outdata.missing_witness_script.IsNull() && !outdata.missing_sigs.empty()) {
                     input_analysis.next = PSBTRole::SIGNER;
                 } else {
-                    only_missing_sigs = false;
                     input_analysis.next = PSBTRole::UPDATER;
                 }
             } else {
-                only_missing_final = true;
                 input_analysis.next = PSBTRole::FINALIZER;
             }
         } else if (!utxo.IsNull()){
@@ -86,10 +84,14 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
         }
     }
 
-    if (all_final) {
-        only_missing_sigs = false;
-        result.next = PSBTRole::EXTRACTOR;
+    // Calculate next role for PSBT by grabbing "minumum" PSBTInput next role
+    result.next = PSBTRole::EXTRACTOR;
+    for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
+        PSBTInputAnalysis& input_analysis = result.inputs[i];
+        result.next = std::min(result.next, input_analysis.next);
     }
+    assert(result.next > PSBTRole::CREATOR);
+
     if (calc_fee) {
         // Get the output amount
         CAmount out_amt = std::accumulate(psbtx.tx->vout.begin(), psbtx.tx->vout.end(), CAmount(0),
@@ -139,17 +141,6 @@ PSBTAnalysis AnalyzePSBT(PartiallySignedTransaction psbtx)
             result.estimated_feerate = feerate;
         }
 
-        if (only_missing_sigs) {
-            result.next = PSBTRole::SIGNER;
-        } else if (only_missing_final) {
-            result.next = PSBTRole::FINALIZER;
-        } else if (all_final) {
-            result.next = PSBTRole::EXTRACTOR;
-        } else {
-            result.next = PSBTRole::UPDATER;
-        }
-    } else {
-        result.next = PSBTRole::UPDATER;
     }
 
     return result;
-- 
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