From d3354c52d7c0c6446cad4074c1d0e04bb1b3d84e Mon Sep 17 00:00:00 2001
From: Matt Corallo <git@bluematt.me>
Date: Tue, 9 Jun 2015 23:36:36 -0700
Subject: [PATCH] Add have-pubkey distinction to ISMINE flags

This indicates that, eg, we have a public key for a key which may
be used as a pay-to-pubkey-hash. It generally means that we can
create a valid scriptSig except for missing private key(s) with
which to create signatures.
---
 src/qt/transactiondesc.cpp   |  4 ++--
 src/qt/transactionrecord.cpp |  6 +++---
 src/wallet/wallet_ismine.cpp | 10 +++++++---
 src/wallet/wallet_ismine.h   |  8 ++++++--
 4 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/src/qt/transactiondesc.cpp b/src/qt/transactiondesc.cpp
index af78a51d0..801c6c62d 100644
--- a/src/qt/transactiondesc.cpp
+++ b/src/qt/transactiondesc.cpp
@@ -165,7 +165,7 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx, TransactionReco
 
         if (fAllFromMe)
         {
-            if(fAllFromMe == ISMINE_WATCH_ONLY)
+            if(fAllFromMe & ISMINE_WATCH_ONLY)
                 strHTML += "<b>" + tr("From") + ":</b> " + tr("watch-only") + "<br>";
 
             //
@@ -190,7 +190,7 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx, TransactionReco
                         strHTML += GUIUtil::HtmlEscape(CBitcoinAddress(address).ToString());
                         if(toSelf == ISMINE_SPENDABLE)
                             strHTML += " (own address)";
-                        else if(toSelf == ISMINE_WATCH_ONLY)
+                        else if(toSelf & ISMINE_WATCH_ONLY)
                             strHTML += " (watch-only)";
                         strHTML += "<br>";
                     }
diff --git a/src/qt/transactionrecord.cpp b/src/qt/transactionrecord.cpp
index 15d13e9fc..d8623daf5 100644
--- a/src/qt/transactionrecord.cpp
+++ b/src/qt/transactionrecord.cpp
@@ -56,7 +56,7 @@ QList<TransactionRecord> TransactionRecord::decomposeTransaction(const CWallet *
                 CTxDestination address;
                 sub.idx = parts.size(); // sequence number
                 sub.credit = txout.nValue;
-                sub.involvesWatchAddress = mine == ISMINE_WATCH_ONLY;
+                sub.involvesWatchAddress = mine & ISMINE_WATCH_ONLY;
                 if (ExtractDestination(txout.scriptPubKey, address) && IsMine(*wallet, address))
                 {
                     // Received by Bitcoin Address
@@ -86,7 +86,7 @@ QList<TransactionRecord> TransactionRecord::decomposeTransaction(const CWallet *
         BOOST_FOREACH(const CTxIn& txin, wtx.vin)
         {
             isminetype mine = wallet->IsMine(txin);
-            if(mine == ISMINE_WATCH_ONLY) involvesWatchAddress = true;
+            if(mine & ISMINE_WATCH_ONLY) involvesWatchAddress = true;
             if(fAllFromMe > mine) fAllFromMe = mine;
         }
 
@@ -94,7 +94,7 @@ QList<TransactionRecord> TransactionRecord::decomposeTransaction(const CWallet *
         BOOST_FOREACH(const CTxOut& txout, wtx.vout)
         {
             isminetype mine = wallet->IsMine(txout);
-            if(mine == ISMINE_WATCH_ONLY) involvesWatchAddress = true;
+            if(mine & ISMINE_WATCH_ONLY) involvesWatchAddress = true;
             if(fAllToMe > mine) fAllToMe = mine;
         }
 
diff --git a/src/wallet/wallet_ismine.cpp b/src/wallet/wallet_ismine.cpp
index 5482348e3..0303cbb2f 100644
--- a/src/wallet/wallet_ismine.cpp
+++ b/src/wallet/wallet_ismine.cpp
@@ -9,6 +9,7 @@
 #include "keystore.h"
 #include "script/script.h"
 #include "script/standard.h"
+#include "script/sign.h"
 
 #include <boost/foreach.hpp>
 
@@ -40,7 +41,7 @@ isminetype IsMine(const CKeyStore &keystore, const CScript& scriptPubKey)
     txnouttype whichType;
     if (!Solver(scriptPubKey, whichType, vSolutions)) {
         if (keystore.HaveWatchOnly(scriptPubKey))
-            return ISMINE_WATCH_ONLY;
+            return ISMINE_WATCH_NOPUBKEY;
         return ISMINE_NO;
     }
 
@@ -85,7 +86,10 @@ isminetype IsMine(const CKeyStore &keystore, const CScript& scriptPubKey)
     }
     }
 
-    if (keystore.HaveWatchOnly(scriptPubKey))
-        return ISMINE_WATCH_ONLY;
+    if (keystore.HaveWatchOnly(scriptPubKey)) {
+        // TODO: This could be optimized some by doing some work after the above solver
+        CScript scriptSig;
+        return ProduceSignature(DummySignatureCreator(&keystore), scriptPubKey, scriptSig) ? ISMINE_WATCH_PUBKEY : ISMINE_WATCH_NOPUBKEY;
+    }
     return ISMINE_NO;
 }
diff --git a/src/wallet/wallet_ismine.h b/src/wallet/wallet_ismine.h
index 5b9b0e084..12afad175 100644
--- a/src/wallet/wallet_ismine.h
+++ b/src/wallet/wallet_ismine.h
@@ -16,8 +16,12 @@ class CScript;
 enum isminetype
 {
     ISMINE_NO = 0,
-    ISMINE_WATCH_ONLY = 1,
-    ISMINE_SPENDABLE = 2,
+    //! Indicates that we dont know how to create a scriptSig that would solve this if we were given the appropriate private keys
+    ISMINE_WATCH_NOPUBKEY = 1,
+    //! Indicates that we know how to create a scriptSig that would solve this if we were given the appropriate private keys
+    ISMINE_WATCH_PUBKEY = 2,
+    ISMINE_WATCH_ONLY = ISMINE_WATCH_NOPUBKEY | ISMINE_WATCH_PUBKEY,
+    ISMINE_SPENDABLE = 4,
     ISMINE_ALL = ISMINE_WATCH_ONLY | ISMINE_SPENDABLE
 };
 /** used for bitflags of isminetype */