Add outputtype module

Moves OutputType into its own module

src/outputtype.cpp

@@ -0,0 +1,76 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2017 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <outputtype.h>
+
+#include <keystore.h>
+#include <pubkey.h>
+#include <script/script.h>
+#include <script/standard.h>
+
+#include <assert.h>
+#include <string>
+
+static const std::string OUTPUT_TYPE_STRING_LEGACY = "legacy";
+static const std::string OUTPUT_TYPE_STRING_P2SH_SEGWIT = "p2sh-segwit";
+static const std::string OUTPUT_TYPE_STRING_BECH32 = "bech32";
+
+bool ParseOutputType(const std::string& type, OutputType& output_type)
+{
+    if (type == OUTPUT_TYPE_STRING_LEGACY) {
+        output_type = OutputType::LEGACY;
+        return true;
+    } else if (type == OUTPUT_TYPE_STRING_P2SH_SEGWIT) {
+        output_type = OutputType::P2SH_SEGWIT;
+        return true;
+    } else if (type == OUTPUT_TYPE_STRING_BECH32) {
+        output_type = OutputType::BECH32;
+        return true;
+    }
+    return false;
+}
+
+const std::string& FormatOutputType(OutputType type)
+{
+    switch (type) {
+    case OutputType::LEGACY: return OUTPUT_TYPE_STRING_LEGACY;
+    case OutputType::P2SH_SEGWIT: return OUTPUT_TYPE_STRING_P2SH_SEGWIT;
+    case OutputType::BECH32: return OUTPUT_TYPE_STRING_BECH32;
+    default: assert(false);
+    }
+}
+
+CTxDestination GetDestinationForKey(const CPubKey& key, OutputType type)
+{
+    switch (type) {
+    case OutputType::LEGACY: return key.GetID();
+    case OutputType::P2SH_SEGWIT:
+    case OutputType::BECH32: {
+        if (!key.IsCompressed()) return key.GetID();
+        CTxDestination witdest = WitnessV0KeyHash(key.GetID());
+        CScript witprog = GetScriptForDestination(witdest);
+        if (type == OutputType::P2SH_SEGWIT) {
+            return CScriptID(witprog);
+        } else {
+            return witdest;
+        }
+    }
+    default: assert(false);
+    }
+}
+
+std::vector<CTxDestination> GetAllDestinationsForKey(const CPubKey& key)
+{
+    CKeyID keyid = key.GetID();
+    if (key.IsCompressed()) {
+        CTxDestination segwit = WitnessV0KeyHash(keyid);
+        CTxDestination p2sh = CScriptID(GetScriptForDestination(segwit));
+        return std::vector<CTxDestination>{std::move(keyid), std::move(p2sh), std::move(segwit)};
+    } else {
+        return std::vector<CTxDestination>{std::move(keyid)};
+    }
+}
+
+