feat!: introduce SignerKey class for enhanced signer key handling. (#712)

Author: overcat

CHANGELOG.md

@@ -2,6 +2,18 @@
 
 ## Pending
 
+### Update:
+- feat: add `isValidSignedPayload` to `StrKey` class, this function can be used to validate the ed25519 signed payload. ([#712](https://github.com/stellar/java-stellar-sdk/pull/712))
+
+### Breaking changes:
+- feat: add `org.stellar.sdk.SignerKey` for enhanced signer key handling. ([#712](https://github.com/stellar/java-stellar-sdk/pull/712))
+  - `org.stellar.sdk.Signer` and `org.stellar.sdk.SignedPayloadSigner` has been removed, use `org.stellar.sdk.SignerKey` instead.
+  - The `StrKey#encodeSignedPayload(SignedPayloadSigner)` and `StrKey#decodeSignedPayload(String)` methods now operate on raw `byte[]` instead of the `SignedPayloadSigner` object to provide more flexibility.
+  - `KeyPair#fromXdrSignerKey()` and `KeyPair#getXdrSignerKey()` have been removed, use `org.stellar.sdk.SignerKey` instead.
+  - The type of `TransactionPreconditions#extraSigners` has been changed from `List<org.stellar.sdk.xdr.SignerKey>` to `List<org.stellar.sdk.SignerKey>`.
+  - The type of `SetOptionsOperation#signer` has been changed from `org.stellar.sdk.xdr.SignerKey` to `org.stellar.sdk.SignerKey`.
+  - The type of `RevokeSignerSponsorshipOperation#signer` has been changed from `org.stellar.sdk.xdr.SignerKey` to `org.stellar.sdk.SignerKey`.
+
 ## 2.0.0-beta0
 
 ### Update:

src/main/java/org/stellar/sdk/KeyPair.java

@@ -20,8 +20,6 @@
 import org.stellar.sdk.xdr.DecoratedSignature;
 import org.stellar.sdk.xdr.PublicKeyType;
 import org.stellar.sdk.xdr.SignatureHint;
-import org.stellar.sdk.xdr.SignerKey;
-import org.stellar.sdk.xdr.SignerKeyType;
 import org.stellar.sdk.xdr.Uint256;
 import org.stellar.sdk.xdr.XdrDataOutputStream;
 
@@ -224,16 +222,6 @@ public AccountID getXdrAccountId() {
     return accountID;
   }
 
-  /** Returns the XDR {@link SignerKey} for this keypair. */
-  public SignerKey getXdrSignerKey() {
-    SignerKey signerKey = new SignerKey();
-    signerKey.setDiscriminant(SignerKeyType.SIGNER_KEY_TYPE_ED25519);
-    Uint256 uint256 = new Uint256();
-    uint256.setUint256(getPublicKey());
-    signerKey.setEd25519(uint256);
-    return signerKey;
-  }
-
   /**
    * Creates a new KeyPair from an XDR {@link org.stellar.sdk.xdr.PublicKey}.
    *
@@ -244,16 +232,6 @@ public static KeyPair fromXdrPublicKey(org.stellar.sdk.xdr.PublicKey key) {
     return KeyPair.fromPublicKey(key.getEd25519().getUint256());
   }
 
-  /**
-   * Creates a new KeyPair from an XDR {@link SignerKey}.
-   *
-   * @param key The XDR {@link SignerKey} object.
-   * @return KeyPair
-   */
-  public static KeyPair fromXdrSignerKey(SignerKey key) {
-    return KeyPair.fromPublicKey(key.getEd25519().getUint256());
-  }
-
   /**
    * Sign the provided data with the keypair's private key.
    *