wallet import and export needs

src/main/java/com/sparrowwallet/drongo/ExtendedPublicKey.java

@@ -2,20 +2,14 @@ package com.sparrowwallet.drongo;
 
 import com.sparrowwallet.drongo.crypto.*;
 import com.sparrowwallet.drongo.protocol.Base58;
+import com.sparrowwallet.drongo.protocol.ScriptType;
 
 import java.nio.ByteBuffer;
 import java.util.*;
 
 import static com.sparrowwallet.drongo.KeyDerivation.parsePath;
-import static com.sparrowwallet.drongo.KeyDerivation.writePath;
 
 public class ExtendedPublicKey {
-    private static final int bip32HeaderP2PKHXPub = 0x0488B21E; //The 4 byte header that serializes in base58 to "xpub".
-    private static final int bip32HeaderP2PKHYPub = 0x049D7CB2; //The 4 byte header that serializes in base58 to "ypub".
-    private static final int bip32HeaderP2WPKHZPub = 0x04B24746; // The 4 byte header that serializes in base58 to "zpub"
-    private static final int bip32HeaderP2WHSHPub = 0x2AA7ED3; // The 4 byte header that serializes in base58 to "Zpub"
-    private static final int bip32HeaderTestnetPub = 0x43587CF; // The 4 byte header that serializes in base58 to "tpub"
-
     private final byte[] parentFingerprint;
     private final DeterministicKey pubKey;
     private final ChildNumber pubKeyChildNumber;
@@ -44,17 +38,29 @@ public class ExtendedPublicKey {
         return getExtendedPublicKey();
     }
 
+    public String toString(XpubHeader xpubHeader) {
+        return getExtendedPublicKey(xpubHeader);
+    }
+
     public String getExtendedPublicKey() {
         return Base58.encodeChecked(getExtendedPublicKeyBytes());
     }
 
+    public String getExtendedPublicKey(XpubHeader xpubHeader) {
+        return Base58.encodeChecked(getExtendedPublicKeyBytes(xpubHeader));
+    }
+
     public ChildNumber getPubKeyChildNumber() {
         return pubKeyChildNumber;
     }
 
     public byte[] getExtendedPublicKeyBytes() {
+        return getExtendedPublicKeyBytes(XpubHeader.xpub);
+    }
+
+    public byte[] getExtendedPublicKeyBytes(XpubHeader xpubHeader) {
         ByteBuffer buffer = ByteBuffer.allocate(78);
-        buffer.putInt(bip32HeaderP2PKHXPub);
+        buffer.putInt(xpubHeader.header);
         buffer.put((byte)pubKey.getDepth());
         buffer.put(parentFingerprint);
         buffer.putInt(pubKeyChildNumber.i());
@@ -68,7 +74,7 @@ public class ExtendedPublicKey {
         byte[] serializedKey = Base58.decodeChecked(extPubKey);
         ByteBuffer buffer = ByteBuffer.wrap(serializedKey);
         int header = buffer.getInt();
-        if(!(header == bip32HeaderP2PKHXPub || header == bip32HeaderP2PKHYPub || header == bip32HeaderP2WPKHZPub || header == bip32HeaderP2WHSHPub || header == bip32HeaderTestnetPub)) {
+        if(!XpubHeader.isValidHeader(header)) {
             throw new IllegalArgumentException("Unknown header bytes: " + DeterministicKey.toBase58(serializedKey).substring(0, 4));
         }
 
@@ -128,4 +134,69 @@ public class ExtendedPublicKey {
     public int hashCode() {
         return toString().hashCode();
     }
-}
+
+    public enum XpubHeader {
+        xpub("xpub", 0x0488B21E, ScriptType.P2PKH),
+        ypub("ypub", 0x049D7CB2, ScriptType.P2SH_P2WPKH),
+        zpub("zpub", 0x04B24746, ScriptType.P2WPKH),
+        Ypub("Ypub", 0x0295b43f, ScriptType.P2SH_P2WSH),
+        Zpub("Zpub", 0x02aa7ed3, ScriptType.P2WSH),
+        tpub("tpub", 0x043587cf, ScriptType.P2PKH),
+        upub("upub", 0x044a5262, ScriptType.P2SH_P2WPKH),
+        vpub("vpub", 0x045f1cf6, ScriptType.P2WPKH),
+        Upub("Upub", 0x024289ef, ScriptType.P2SH_P2WSH),
+        Vpub("Vpub", 0x02575483, ScriptType.P2WSH);
+
+        private final String name;
+        private final int header;
+        private final ScriptType defaultScriptType;
+
+        XpubHeader(String name, int header, ScriptType defaultScriptType) {
+            this.name = name;
+            this.header = header;
+            this.defaultScriptType = defaultScriptType;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        public int getHeader() {
+            return header;
+        }
+
+        public ScriptType getDefaultScriptType() {
+            return defaultScriptType;
+        }
+
+        public static XpubHeader fromXpub(String xpub) {
+            for(XpubHeader xpubHeader : XpubHeader.values()) {
+                if(xpub.startsWith(xpubHeader.name)) {
+                    return xpubHeader;
+                }
+            }
+
+            throw new IllegalArgumentException("Unrecognised xpub header for xpub: " + xpub);
+        }
+
+        public static XpubHeader fromScriptType(ScriptType scriptType) {
+            for(XpubHeader xpubHeader : XpubHeader.values()) {
+                if(xpubHeader.defaultScriptType.equals(scriptType)) {
+                    return xpubHeader;
+                }
+            }
+
+            return XpubHeader.xpub;
+        }
+
+        public static boolean isValidHeader(int header) {
+            for(XpubHeader xpubHeader : XpubHeader.values()) {
+                if(header == xpubHeader.header) {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+    }
+}

src/main/java/com/sparrowwallet/drongo/KeyDerivation.java

@@ -12,7 +12,7 @@ public class KeyDerivation {
     private final transient List<ChildNumber> derivation;
 
     public KeyDerivation(String masterFingerprint, String derivationPath) {
-        this.masterFingerprint = masterFingerprint;
+        this.masterFingerprint = masterFingerprint == null ? null : masterFingerprint.toLowerCase();
         this.derivationPath = derivationPath;
         this.derivation = parsePath(derivationPath);
     }

src/main/java/com/sparrowwallet/drongo/policy/Miniscript.java

@@ -39,4 +39,9 @@ public class Miniscript {
     public Miniscript copy() {
         return new Miniscript(script);
     }
+
+    @Override
+    public String toString() {
+        return getScript();
+    }
 }

src/main/java/com/sparrowwallet/drongo/protocol/ScriptType.java

@@ -15,7 +15,7 @@ import static com.sparrowwallet.drongo.protocol.Script.decodeFromOpN;
 import static com.sparrowwallet.drongo.protocol.ScriptOpCodes.*;
 
 public enum ScriptType {
-    P2PK("P2PK") {
+    P2PK("P2PK", "m/44'/0'/0'") {
         @Override
         public Address getAddress(byte[] pubKey) {
             return new P2PKAddress(pubKey);
@@ -67,7 +67,7 @@ public enum ScriptType {
             return List.of(SINGLE);
         }
     },
-    P2PKH("P2PKH") {
+    P2PKH("P2PKH", "m/44'/0'/0'") {
         @Override
         public Address getAddress(byte[] pubKeyHash) {
             return new P2PKHAddress(pubKeyHash);
@@ -116,7 +116,7 @@ public enum ScriptType {
             return List.of(SINGLE);
         }
     },
-    MULTISIG("Bare Multisig") {
+    MULTISIG("Bare Multisig", "m/44'/0'/0'") {
         @Override
         public Address getAddress(byte[] bytes) {
             throw new ProtocolException("No single address for multisig script type");
@@ -196,7 +196,7 @@ public enum ScriptType {
             return List.of(MULTI);
         }
     },
-    P2SH("P2SH") {
+    P2SH("P2SH", "m/45'/0'/0'") {
         @Override
         public Address getAddress(byte[] bytes) {
             return new P2SHAddress(bytes);
@@ -247,7 +247,7 @@ public enum ScriptType {
             return List.of(MULTI);
         }
     },
-    P2SH_P2WPKH("P2SH-P2WPKH") {
+    P2SH_P2WPKH("P2SH-P2WPKH", "m/49'/0'/0'") {
         @Override
         public Address getAddress(byte[] bytes) {
             return P2SH.getAddress(bytes);
@@ -273,7 +273,7 @@ public enum ScriptType {
             return List.of(SINGLE);
         }
     },
-    P2SH_P2WSH("P2SH-P2WSH") {
+    P2SH_P2WSH("P2SH-P2WSH", "m/48'/0'/0'/1'") {
         @Override
         public Address getAddress(byte[] bytes) {
             return P2SH.getAddress(bytes);
@@ -299,7 +299,7 @@ public enum ScriptType {
             return List.of(MULTI, CUSTOM);
         }
     },
-    P2WPKH("P2WPKH") {
+    P2WPKH("P2WPKH", "m/84'/0'/0'") {
         @Override
         public Address getAddress(byte[] bytes) {
             return new P2WPKHAddress(bytes);
@@ -339,7 +339,7 @@ public enum ScriptType {
             return List.of(SINGLE);
         }
     },
-    P2WSH("P2WSH") {
+    P2WSH("P2WSH", "m/48'/0'/0'/2'") {
         @Override
         public Address getAddress(byte[] bytes) {
             return new P2WSHAddress(bytes);
@@ -381,15 +381,21 @@ public enum ScriptType {
     };
 
     private final String name;
+    private final String defaultDerivation;
 
-    ScriptType(String name) {
+    ScriptType(String name, String defaultDerivation) {
         this.name = name;
+        this.defaultDerivation = defaultDerivation;
     }
 
     public String getName() {
         return name;
     }
 
+    public String getDefaultDerivation() {
+        return defaultDerivation;
+    }
+
     public abstract List<PolicyType> getAllowedPolicyTypes();
 
     public boolean isAllowed(PolicyType policyType) {

src/main/java/com/sparrowwallet/drongo/wallet/Keystore.java

@@ -2,6 +2,7 @@ package com.sparrowwallet.drongo.wallet;
 
 import com.sparrowwallet.drongo.ExtendedPublicKey;
 import com.sparrowwallet.drongo.KeyDerivation;
+import com.sparrowwallet.drongo.Utils;
 
 public class Keystore {
     public static final String DEFAULT_LABEL = "Keystore 1";
@@ -46,6 +47,22 @@ public class Keystore {
         this.extendedPublicKey = extendedPublicKey;
     }
 
+    public boolean isValid() {
+        if(label == null || keyDerivation == null || extendedPublicKey == null) {
+            return false;
+        }
+
+        if(keyDerivation.getDerivationPath() == null || !KeyDerivation.isValid(keyDerivation.getDerivationPath())) {
+            return false;
+        }
+
+        if(keyDerivation.getMasterFingerprint() == null || keyDerivation.getMasterFingerprint().length() != 8 || !Utils.isHex(keyDerivation.getMasterFingerprint())) {
+            return false;
+        }
+
+        return true;
+    }
+
     public Keystore copy() {
         Keystore copy = new Keystore(label);
         if(keyDerivation != null) {

src/main/java/com/sparrowwallet/drongo/wallet/Wallet.java

@@ -10,22 +10,35 @@ import java.util.List;
 
 public class Wallet {
 
+    private String name;
     private PolicyType policyType;
     private ScriptType scriptType;
     private Policy defaultPolicy;
     private List<Keystore> keystores = new ArrayList<>();
 
     public Wallet() {
-
     }
 
-    public Wallet(PolicyType policyType, ScriptType scriptType) {
+    public Wallet(String name) {
+        this.name = name;
+    }
+
+    public Wallet(String name, PolicyType policyType, ScriptType scriptType) {
+        this.name = name;
         this.policyType = policyType;
         this.scriptType = scriptType;
         this.keystores = Collections.singletonList(new Keystore());
         this.defaultPolicy = Policy.getPolicy(policyType, scriptType, keystores, null);
     }
 
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
     public PolicyType getPolicyType() {
         return policyType;
     }
@@ -58,8 +71,41 @@ public class Wallet {
         this.keystores = keystores;
     }
 
+    public boolean isValid() {
+        if(policyType == null || scriptType == null || defaultPolicy == null || keystores.isEmpty()) {
+            return false;
+        }
+
+        if(!ScriptType.getScriptTypesForPolicyType(policyType).contains(scriptType)) {
+            return false;
+        }
+
+        int numSigs;
+        try {
+            numSigs = defaultPolicy.getNumSignaturesRequired();
+        } catch (Exception e) {
+            return false;
+        }
+
+        if(policyType.equals(PolicyType.SINGLE) && (numSigs != 1 || keystores.size() != 1)) {
+            return false;
+        }
+
+        if(policyType.equals(PolicyType.MULTI) && (numSigs <= 1 || numSigs > keystores.size())) {
+            return false;
+        }
+
+        for(Keystore keystore : keystores) {
+            if(!keystore.isValid()) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
     public Wallet copy() {
-        Wallet copy = new Wallet();
+        Wallet copy = new Wallet(name);
         copy.setPolicyType(policyType);
         copy.setScriptType(scriptType);
         copy.setDefaultPolicy(defaultPolicy.copy());