Add support for snapshotting

Author: pjdarton

src/main/java/io/jenkins/plugins/credentials/secretsmanager/factory/BaseAwsJsonCredentials.java

@@ -24,11 +24,31 @@ public abstract class BaseAwsJsonCredentials extends BaseStandardCredentials {
     /** How to access the JSON */
     private final Supplier<Secret> supplierOfSecretData;
 
+    /**
+     * Constructs a new instance with new data.
+     * 
+     * @param id                 The value for {@link #getId()}.
+     * @param description        The value for {@link #getDescription()}.
+     * @param secretJsonSupplier Supplies the data that
+     *                           {@link #getFieldFromSecretJson(String)} will
+     *                           decode.
+     */
     protected BaseAwsJsonCredentials(String id, String description, Supplier<Secret> secretJsonSupplier) {
         super(id, description);
         this.supplierOfSecretData = secretJsonSupplier;
     }
 
+    /**
+     * Constructs an instance that is an unchanging snapshot of another instance.
+     * 
+     * @param toSnapshot The instance to be copied.
+     */
+    protected BaseAwsJsonCredentials(BaseAwsJsonCredentials toSnapshot) {
+        super(toSnapshot.getId(), toSnapshot.getDescription());
+        final Secret secretDataToSnapshot = toSnapshot.supplierOfSecretData.get();
+        this.supplierOfSecretData = new Snapshot<Secret>(secretDataToSnapshot);
+    }
+
     /**
      * Reads the secret JSON and returns the field requested.
      * 

src/main/java/io/jenkins/plugins/credentials/secretsmanager/factory/username_password/AwsJsonUsernamePasswordCredentials.java

@@ -39,10 +39,31 @@ public class AwsJsonUsernamePasswordCredentials extends BaseAwsJsonCredentials
     @Restricted(NoExternalUse.class)
     public static final String JSON_FIELDNAME_FOR_PASSWORD = "password";
 
+    /**
+     * Constructs a new instance.
+     * 
+     * @param id                      The value for {@link #getId()}.
+     * @param description             The value for {@link #getDescription()}.
+     * @param usernameAndPasswordJson Supplies JSON containing a
+     *                                {@value #JSON_FIELDNAME_FOR_USERNAME} field
+     *                                and a {@value #JSON_FIELDNAME_FOR_PASSWORD}
+     *                                field.
+     */
     public AwsJsonUsernamePasswordCredentials(String id, String description, Supplier<Secret> usernameAndPasswordJson) {
         super(id, description, usernameAndPasswordJson);
     }
 
+    /**
+     * Constructs a snapshot of an existing instance.
+     * 
+     * @param toBeSnapshotted The instance that contains the live data to be
+     *                        snapshotted.
+     */
+    @Restricted(NoExternalUse.class)
+    AwsJsonUsernamePasswordCredentials(AwsJsonUsernamePasswordCredentials toBeSnapshotted) {
+        super(toBeSnapshotted);
+    }
+
     @NonNull
     @Override
     public Secret getPassword() {
@@ -56,11 +77,11 @@ public String getUsername() {
     }
 
     @Override
-	public boolean isUsernameSecret() {
-		return true;
-	}
+    public boolean isUsernameSecret() {
+        return true;
+    }
 
-	@Extension
+    @Extension
     @SuppressWarnings("unused")
     public static class DescriptorImpl extends BaseStandardCredentialsDescriptor {
         @Override

src/main/java/io/jenkins/plugins/credentials/secretsmanager/factory/username_password/AwsJsonUsernamePasswordCredentialsSnapshotTaker.java

@@ -0,0 +1,20 @@
+package io.jenkins.plugins.credentials.secretsmanager.factory.username_password;
+
+import com.cloudbees.plugins.credentials.CredentialsSnapshotTaker;
+import hudson.Extension;
+import hudson.util.Secret;
+import io.jenkins.plugins.credentials.secretsmanager.factory.Snapshot;
+
+@Extension
+@SuppressWarnings("unused")
+public class AwsJsonUsernamePasswordCredentialsSnapshotTaker extends CredentialsSnapshotTaker<AwsJsonUsernamePasswordCredentials> {
+    @Override
+    public Class<AwsJsonUsernamePasswordCredentials> type() {
+        return AwsJsonUsernamePasswordCredentials.class;
+    }
+
+    @Override
+    public AwsJsonUsernamePasswordCredentials snapshot(AwsJsonUsernamePasswordCredentials credential) {
+        return new AwsJsonUsernamePasswordCredentials(credential);
+    }
+}