Add dumpwallet and importwallet RPCs

dumpwallet: produce a dump of all keys in a wallet, in a format
compatible with Bitcoin Wallet for Android and Multibit.

importwallet: import such a dump

src/bitcoinrpc.cpp

@@ -243,7 +243,9 @@ static const CRPCCommand vRPCCommands[] =
     { "submitblock",            &submitblock,            false,     false },
     { "listsinceblock",         &listsinceblock,         false,     false },
     { "dumpprivkey",            &dumpprivkey,            true,      false },
+    { "dumpwallet",             &dumpwallet,             true,      false },
     { "importprivkey",          &importprivkey,          false,     false },
+    { "importwallet",           &importwallet,           false,     false },
     { "listunspent",            &listunspent,            false,     false },
     { "getrawtransaction",      &getrawtransaction,      false,     false },
     { "createrawtransaction",   &createrawtransaction,   false,     false },

src/bitcoinrpc.h

@@ -145,8 +145,11 @@ extern json_spirit::Value getconnectioncount(const json_spirit::Array& params, b
 extern json_spirit::Value getpeerinfo(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value addnode(const json_spirit::Array& params, bool fHelp);
 extern json_spirit::Value getaddednodeinfo(const json_spirit::Array& params, bool fHelp);
+
 extern json_spirit::Value dumpprivkey(const json_spirit::Array& params, bool fHelp); // in rpcdump.cpp
 extern json_spirit::Value importprivkey(const json_spirit::Array& params, bool fHelp);
+extern json_spirit::Value dumpwallet(const json_spirit::Array& params, bool fHelp);
+extern json_spirit::Value importwallet(const json_spirit::Array& params, bool fHelp);
 
 extern json_spirit::Value getgenerate(const json_spirit::Array& params, bool fHelp); // in rpcmining.cpp
 extern json_spirit::Value setgenerate(const json_spirit::Array& params, bool fHelp);

src/rpcdump.cpp

@@ -2,35 +2,68 @@
 // Distributed under the MIT/X11 software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#include <iostream>
+#include <fstream>
+
 #include "init.h" // for pwalletMain
 #include "bitcoinrpc.h"
 #include "ui_interface.h"
 #include "base58.h"
 
+#include <boost/date_time/posix_time/posix_time.hpp>
 #include <boost/lexical_cast.hpp>
+#include <boost/variant/get.hpp>
+#include <boost/algorithm/string.hpp>
 
 #define printf OutputDebugStringF
 
 using namespace json_spirit;
 using namespace std;
 
-class CTxDump
-{
-public:
-    CBlockIndex *pindex;
-    int64 nValue;
-    bool fSpent;
-    CWalletTx* ptx;
-    int nOut;
-    CTxDump(CWalletTx* ptx = NULL, int nOut = -1)
-    {
-        pindex = NULL;
-        nValue = 0;
-        fSpent = false;
-        this->ptx = ptx;
-        this->nOut = nOut;
+void EnsureWalletIsUnlocked();
+
+std::string static EncodeDumpTime(int64 nTime) {
+    return DateTimeStrFormat("%Y-%m-%dT%H:%M:%SZ", nTime);
+}
+
+int64 static DecodeDumpTime(const std::string &str) {
+    static const boost::posix_time::time_input_facet facet("%Y-%m-%dT%H:%M:%SZ");
+    static const boost::posix_time::ptime epoch = boost::posix_time::from_time_t(0);
+    const std::locale loc(std::locale::classic(), &facet);
+    std::istringstream iss(str);
+    iss.imbue(loc);
+    boost::posix_time::ptime ptime(boost::date_time::not_a_date_time);
+    iss >> ptime;
+    if (ptime.is_not_a_date_time())
+        return 0;
+    return (ptime - epoch).total_seconds();
+}
+
+std::string static EncodeDumpString(const std::string &str) {
+    std::stringstream ret;
+    BOOST_FOREACH(unsigned char c, str) {
+        if (c <= 32 || c >= 128 || c == '%') {
+            ret << '%' << HexStr(&c, &c + 1);
+        } else {
+            ret << c;
+        }
+    }
+    return ret.str();
+}
+
+std::string DecodeDumpString(const std::string &str) {
+    std::stringstream ret;
+    for (unsigned int pos = 0; pos < str.length(); pos++) {
+        unsigned char c = str[pos];
+        if (c == '%' && pos+2 < str.length()) {
+            c = (((str[pos+1]>>6)*9+((str[pos+1]-'0')&15)) << 4) | 
+                ((str[pos+2]>>6)*9+((str[pos+2]-'0')&15));
+            pos += 2;
+        }
+        ret << c;
     }
-};
+    return ret.str();
+}
 
 Value importprivkey(const Array& params, bool fHelp)
 {
@@ -63,6 +96,10 @@ Value importprivkey(const Array& params, bool fHelp)
         pwalletMain->MarkDirty();
         pwalletMain->SetAddressBookName(vchAddress, strLabel);
 
+        // Don't throw error in case a key is already there
+        if (pwalletMain->HaveKey(vchAddress))
+            return Value::null;
+
         if (!pwalletMain->AddKeyPubKey(key, pubkey))
             throw JSONRPCError(RPC_WALLET_ERROR, "Error adding key to wallet");
 
@@ -75,6 +112,86 @@ Value importprivkey(const Array& params, bool fHelp)
     return Value::null;
 }
 
+Value importwallet(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() != 1)
+        throw runtime_error(
+            "importwallet <filename>\n"
+            "Imports keys from a wallet dump file (see dumpwallet).");
+
+    EnsureWalletIsUnlocked();
+
+    ifstream file;
+    file.open(params[0].get_str().c_str());
+    if (!file.is_open())
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot open wallet dump file");
+
+    int64 nTimeBegin = pindexBest->nTime;
+
+    bool fGood = true;
+
+    while (file.good()) {
+        std::string line;
+        std::getline(file, line);
+        if (line.empty() || line[0] == '#')
+            continue;
+
+        std::vector<std::string> vstr;
+        boost::split(vstr, line, boost::is_any_of(" "));
+        if (vstr.size() < 2)
+            continue;
+        CBitcoinSecret vchSecret;
+        if (!vchSecret.SetString(vstr[0]))
+            continue;
+        CKey key = vchSecret.GetKey();
+        CPubKey pubkey = key.GetPubKey();
+        CKeyID keyid = pubkey.GetID();
+        if (pwalletMain->HaveKey(keyid)) {
+            printf("Skipping import of %s (key already present)\n", CBitcoinAddress(keyid).ToString().c_str());
+            continue;
+        }
+        int64 nTime = DecodeDumpTime(vstr[1]);
+        std::string strLabel;
+        bool fLabel = true;
+        for (unsigned int nStr = 2; nStr < vstr.size(); nStr++) {
+            if (boost::algorithm::starts_with(vstr[nStr], "#"))
+                break;
+            if (vstr[nStr] == "change=1")
+                fLabel = false;
+            if (vstr[nStr] == "reserve=1")
+                fLabel = false;
+            if (boost::algorithm::starts_with(vstr[nStr], "label=")) {
+                strLabel = DecodeDumpString(vstr[nStr].substr(6));
+                fLabel = true;
+            }
+        }
+        printf("Importing %s...\n", CBitcoinAddress(keyid).ToString().c_str());
+        if (!pwalletMain->AddKeyPubKey(key, pubkey)) {
+            fGood = false;
+            continue;
+        }
+        pwalletMain->mapKeyMetadata[keyid].nCreateTime = nTime;
+        if (fLabel)
+            pwalletMain->SetAddressBookName(keyid, strLabel);
+        nTimeBegin = std::min(nTimeBegin, nTime);
+    }
+    file.close();
+
+    CBlockIndex *pindex = pindexBest;
+    while (pindex && pindex->pprev && pindex->nTime > nTimeBegin - 7200)
+        pindex = pindex->pprev;
+
+    printf("Rescanning last %i blocks\n", pindexBest->nHeight - pindex->nHeight + 1);
+    pwalletMain->ScanForWalletTransactions(pindex);
+    pwalletMain->ReacceptWalletTransactions();
+    pwalletMain->MarkDirty();
+
+    if (!fGood)
+        throw JSONRPCError(RPC_WALLET_ERROR, "Error adding some keys to wallet");
+
+    return Value::null;
+}
+
 Value dumpprivkey(const Array& params, bool fHelp)
 {
     if (fHelp || params.size() != 1)
@@ -82,6 +199,8 @@ Value dumpprivkey(const Array& params, bool fHelp)
             "dumpprivkey <bitcoinaddress>\n"
             "Reveals the private key corresponding to <bitcoinaddress>.");
 
+    EnsureWalletIsUnlocked();
+
     string strAddress = params[0].get_str();
     CBitcoinAddress address;
     if (!address.SetString(strAddress))
@@ -94,3 +213,58 @@ Value dumpprivkey(const Array& params, bool fHelp)
         throw JSONRPCError(RPC_WALLET_ERROR, "Private key for address " + strAddress + " is not known");
     return CBitcoinSecret(vchSecret).ToString();
 }
+
+
+Value dumpwallet(const Array& params, bool fHelp)
+{
+    if (fHelp || params.size() != 1)
+        throw runtime_error(
+            "dumpwallet <filename>\n"
+            "Dumps all wallet keys in a human-readable format.");
+
+    EnsureWalletIsUnlocked();
+
+    ofstream file;
+    file.open(params[0].get_str().c_str());
+    if (!file.is_open())
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "Cannot open wallet dump file");
+
+    std::map<CKeyID, int64> mapKeyBirth;
+    std::set<CKeyID> setKeyPool;
+    pwalletMain->GetKeyBirthTimes(mapKeyBirth);
+    pwalletMain->GetAllReserveKeys(setKeyPool);
+
+    // sort time/key pairs
+    std::vector<std::pair<int64, CKeyID> > vKeyBirth;
+    for (std::map<CKeyID, int64>::const_iterator it = mapKeyBirth.begin(); it != mapKeyBirth.end(); it++) {
+        vKeyBirth.push_back(std::make_pair(it->second, it->first));
+    }
+    mapKeyBirth.clear();
+    std::sort(vKeyBirth.begin(), vKeyBirth.end());
+
+    // produce output
+    file << strprintf("# Wallet dump created by Bitcoin %s (%s)\n", CLIENT_BUILD.c_str(), CLIENT_DATE.c_str());
+    file << strprintf("# * Created on %s\n", EncodeDumpTime(GetTime()).c_str());
+    file << strprintf("# * Best block at time of backup was %i (%s),\n", nBestHeight, hashBestChain.ToString().c_str());
+    file << strprintf("#   mined on %s\n", EncodeDumpTime(pindexBest->nTime).c_str());
+    file << "\n";
+    for (std::vector<std::pair<int64, CKeyID> >::const_iterator it = vKeyBirth.begin(); it != vKeyBirth.end(); it++) {
+        const CKeyID &keyid = it->second;
+        std::string strTime = EncodeDumpTime(it->first);
+        std::string strAddr = CBitcoinAddress(keyid).ToString();
+        CKey key;
+        if (pwalletMain->GetKey(keyid, key)) {
+            if (pwalletMain->mapAddressBook.count(keyid)) {
+                file << strprintf("%s %s label=%s # addr=%s\n", CBitcoinSecret(key).ToString().c_str(), strTime.c_str(), EncodeDumpString(pwalletMain->mapAddressBook[keyid]).c_str(), strAddr.c_str());
+            } else if (setKeyPool.count(keyid)) {
+                file << strprintf("%s %s reserve=1 # addr=%s\n", CBitcoinSecret(key).ToString().c_str(), strTime.c_str(), strAddr.c_str());
+            } else {
+                file << strprintf("%s %s change=1 # addr=%s\n", CBitcoinSecret(key).ToString().c_str(), strTime.c_str(), strAddr.c_str());
+            }
+        }
+    }
+    file << "\n";
+    file << "# End of dump\n";
+    file.close();
+    return Value::null;
+}