From fde9fe1010b0da4e7bc161ba5e212aa12cf87665 Mon Sep 17 00:00:00 2001
From: Steven Roose <steven@stevenroose.org>
Date: Tue, 19 Mar 2019 19:50:34 +0000
Subject: [PATCH] Add basic issuance boilerplate

---
 src/blind.cpp                  | 17 +++++++++++++++++
 src/blind.h                    |  2 ++
 src/primitives/transaction.cpp |  2 ++
 src/primitives/transaction.h   | 34 ++++++++++++++++++++++------------
 4 files changed, 43 insertions(+), 12 deletions(-)

diff --git a/src/blind.cpp b/src/blind.cpp
index 5909452784..52b53bc453 100644
--- a/src/blind.cpp
+++ b/src/blind.cpp
@@ -188,3 +188,20 @@ void CreateValueCommitment(CConfidentialValue& conf_value, secp256k1_pedersen_co
     secp256k1_pedersen_commitment_serialize(secp256k1_blind_context, conf_value.vchCommitment.data(), &value_commit);
     assert(conf_value.IsValid());
 }
+
+size_t GetNumIssuances(const CTransaction& tx)
+{
+    unsigned int num_issuances = 0;
+    for (unsigned int i = 0; i < tx.vin.size(); i++) {
+        if (!tx.vin[i].assetIssuance.IsNull()) {
+            if (!tx.vin[i].assetIssuance.nAmount.IsNull()) {
+                num_issuances++;
+            }
+            if (!tx.vin[i].assetIssuance.nInflationKeys.IsNull()) {
+                num_issuances++;
+            }
+        }
+    }
+    return num_issuances;
+}
+
diff --git a/src/blind.h b/src/blind.h
index e54ce56362..e15e420ca9 100644
--- a/src/blind.h
+++ b/src/blind.h
@@ -35,4 +35,6 @@ void BlindAsset(CConfidentialAsset& conf_asset, secp256k1_generator& asset_gen,
 
 void CreateValueCommitment(CConfidentialValue& conf_value, secp256k1_pedersen_commitment& value_commit, const unsigned char* value_blindptr, const secp256k1_generator& asset_gen, const CAmount amount);
 
+size_t GetNumIssuances(const CTransaction& tx);
+
 #endif //BITCOIN_WALLET_BLIND_H
diff --git a/src/primitives/transaction.cpp b/src/primitives/transaction.cpp
index d5c677de09..e22803e19f 100644
--- a/src/primitives/transaction.cpp
+++ b/src/primitives/transaction.cpp
@@ -41,6 +41,8 @@ std::string CTxIn::ToString() const
         str += strprintf(", scriptSig=%s", HexStr(scriptSig).substr(0, 24));
     if (nSequence != SEQUENCE_FINAL)
         str += strprintf(", nSequence=%u", nSequence);
+    if (!assetIssuance.IsNull())
+        str += strprintf(", %s", assetIssuance.ToString());
     str += ")";
     return str;
 }
diff --git a/src/primitives/transaction.h b/src/primitives/transaction.h
index 687682abb2..60797c4324 100644
--- a/src/primitives/transaction.h
+++ b/src/primitives/transaction.h
@@ -11,6 +11,7 @@
 #include <script/script.h>
 #include <serialize.h>
 #include <uint256.h>
+#include <primitives/confidential.h>
 #include <primitives/txwitness.h>
 
 static const int SERIALIZE_TRANSACTION_NO_WITNESS = 0x40000000;
@@ -31,8 +32,7 @@ class COutPoint
 
     /* If this flag is set, the CTxIn including this COutPoint has a
      * CAssetIssuance object. */
-    //TODO(rebase) CA
-    //static const uint32_t OUTPOINT_ISSUANCE_FLAG = (1 << 31);
+    static const uint32_t OUTPOINT_ISSUANCE_FLAG = (1 << 31);
 
     /* If this flag is set, the CTxIn including this COutPoint
      * is a peg-in input. */
@@ -93,6 +93,8 @@ class CTxIn
     //
     // ELEMENTS:
 
+    CAssetIssuance assetIssuance;
+
     /* If this is set to true, the input is interpreted as a
      * peg-in claim and processed as such */
     bool m_is_pegin = false;
@@ -143,14 +145,13 @@ class CTxIn
         //
         // ELEMENTS:
 
-        //TODO(rebase) CA/CT
-        //bool fHasAssetIssuance;
+        bool fHasAssetIssuance;
         COutPoint outpoint;
         if (!ser_action.ForRead()) {
             if (prevout.n == (uint32_t) -1) {
                 // Coinbase inputs do not have asset issuances attached
                 // to them.
-            //    fHasAssetIssuance = false;
+                fHasAssetIssuance = false;
                 outpoint = prevout;
             } else {
                 // The issuance and pegin bits can't be set as it is used to indicate
@@ -160,15 +161,15 @@ class CTxIn
                 assert(!(prevout.n & ~COutPoint::OUTPOINT_INDEX_MASK));
                 // The assetIssuance object is used to represent both new
                 // asset generation and reissuance of existing asset types.
-            //    fHasAssetIssuance = !assetIssuance.IsNull();
+                fHasAssetIssuance = !assetIssuance.IsNull();
                 // The mode is placed in the upper bits of the outpoint's
                 // index field. The IssuanceMode enum values are chosen to
                 // make this as simple as a bitwise-OR.
                 outpoint.hash = prevout.hash;
                 outpoint.n = prevout.n & COutPoint::OUTPOINT_INDEX_MASK;
-            //    if (fHasAssetIssuance) {
-            //        outpoint.n |= COutPoint::OUTPOINT_ISSUANCE_FLAG;
-            //    }
+                if (fHasAssetIssuance) {
+                    outpoint.n |= COutPoint::OUTPOINT_ISSUANCE_FLAG;
+                }
                 if (m_is_pegin) {
                     outpoint.n |= COutPoint::OUTPOINT_PEGIN_FLAG;
                 }
@@ -180,13 +181,13 @@ class CTxIn
         if (ser_action.ForRead()) {
             if (outpoint.n == (uint32_t) -1) {
                 // No asset issuance for Coinbase inputs.
-            //    fHasAssetIssuance = false;
+                fHasAssetIssuance = false;
                 prevout = outpoint;
                 m_is_pegin = false;
             } else {
                 // The presence of the asset issuance object is indicated by
                 // a bit set in the outpoint index field.
-            //    fHasAssetIssuance = !!(outpoint.n & COutPoint::OUTPOINT_ISSUANCE_FLAG);
+                fHasAssetIssuance = !!(outpoint.n & COutPoint::OUTPOINT_ISSUANCE_FLAG);
                 // The interpretation of this input as a peg-in is indicated by
                 // a bit set in the outpoint index field.
                 m_is_pegin = !!(outpoint.n & COutPoint::OUTPOINT_PEGIN_FLAG);
@@ -204,13 +205,22 @@ class CTxIn
 
         READWRITE(scriptSig);
         READWRITE(nSequence);
+
+        // ELEMENTS:
+        // The asset fields are deserialized only if they are present.
+        if (fHasAssetIssuance) {
+            READWRITE(assetIssuance);
+        } else if (ser_action.ForRead()) {
+            assetIssuance.SetNull();
+        }
     }
 
     friend bool operator==(const CTxIn& a, const CTxIn& b)
     {
         return (a.prevout   == b.prevout &&
                 a.scriptSig == b.scriptSig &&
-                a.nSequence == b.nSequence);
+                a.nSequence     == b.nSequence &&
+                a.assetIssuance == b.assetIssuance);
     }
 
     friend bool operator!=(const CTxIn& a, const CTxIn& b)