Add "bitcoin-tx" command line utility and supporting modules.

This is a simple utility that provides command line manipulation of
a hex-encoded TX. The utility takes a hex string on the command line
as input, performs zero or more mutations, and outputs a hex string
to standard output.

This utility is also an intentional exercise of the "bitcoin library"
concept. It is designed to require minimal libraries, and works
entirely without need for any RPC or P2P communication.

See "bitcoin-tx --help" for command and options summary.

1 files changed, 74 insertions, 0 deletions

diff --git a/src/core_write.cpp b/src/core_write.cpp
index 960974df8..2eb220779 100644
--- a/src/core_write.cpp
+++ b/src/core_write.cpp
@@ -1,8 +1,12 @@
 
+#include <vector>
 #include "core_io.h"
+#include "univalue/univalue.h"
+#include "script.h"
 #include "core.h"
 #include "serialize.h"
 #include "util.h"
+#include "base58.h"
 
 using namespace std;
 
@@ -13,3 +17,73 @@ string EncodeHexTx(const CTransaction& tx)
     return HexStr(ssTx.begin(), ssTx.end());
 }
 
+void ScriptPubKeyToUniv(const CScript& scriptPubKey,
+                        UniValue& out, bool fIncludeHex)
+{
+    txnouttype type;
+    vector<CTxDestination> addresses;
+    int nRequired;
+
+    out.pushKV("asm", scriptPubKey.ToString());
+    if (fIncludeHex)
+        out.pushKV("hex", HexStr(scriptPubKey.begin(), scriptPubKey.end()));
+
+    if (!ExtractDestinations(scriptPubKey, type, addresses, nRequired)) {
+        out.pushKV("type", GetTxnOutputType(type));
+        return;
+    }
+
+    out.pushKV("reqSigs", nRequired);
+    out.pushKV("type", GetTxnOutputType(type));
+
+    UniValue a(UniValue::VARR);
+    BOOST_FOREACH(const CTxDestination& addr, addresses)
+        a.push_back(CBitcoinAddress(addr).ToString());
+    out.pushKV("addresses", a);
+}
+
+void TxToUniv(const CTransaction& tx, const uint256& hashBlock, UniValue& entry)
+{
+    entry.pushKV("txid", tx.GetHash().GetHex());
+    entry.pushKV("version", tx.nVersion);
+    entry.pushKV("locktime", (int64_t)tx.nLockTime);
+
+    UniValue vin(UniValue::VARR);
+    BOOST_FOREACH(const CTxIn& txin, tx.vin) {
+        UniValue in(UniValue::VOBJ);
+        if (tx.IsCoinBase())
+            in.pushKV("coinbase", HexStr(txin.scriptSig.begin(), txin.scriptSig.end()));
+        else {
+            in.pushKV("txid", txin.prevout.hash.GetHex());
+            in.pushKV("vout", (int64_t)txin.prevout.n);
+            UniValue o(UniValue::VOBJ);
+            o.pushKV("asm", txin.scriptSig.ToString());
+            o.pushKV("hex", HexStr(txin.scriptSig.begin(), txin.scriptSig.end()));
+            in.pushKV("scriptSig", o);
+        }
+        in.pushKV("sequence", (int64_t)txin.nSequence);
+        vin.push_back(in);
+    }
+    entry.pushKV("vin", vin);
+
+    UniValue vout(UniValue::VARR);
+    for (unsigned int i = 0; i < tx.vout.size(); i++) {
+        const CTxOut& txout = tx.vout[i];
+
+        UniValue out(UniValue::VOBJ);
+
+        UniValue outValue(UniValue::VNUM, FormatMoney(txout.nValue));
+        out.pushKV("value", outValue);
+        out.pushKV("n", (int64_t)i);
+
+        UniValue o(UniValue::VOBJ);
+        ScriptPubKeyToUniv(txout.scriptPubKey, o, true);
+        out.pushKV("scriptPubKey", o);
+        vout.push_back(out);
+    }
+    entry.pushKV("vout", vout);
+
+    if (hashBlock != 0)
+        entry.pushKV("blockhash", hashBlock.GetHex());
+}
+