Add an example using the DynamoDBMapper

Author: SalusaSecondus

examples/com/amazonaws/examples/AwsKmsEncryptedObject.java

@@ -0,0 +1,146 @@
+package com.amazonaws.examples;
+
+import java.security.GeneralSecurityException;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
+import com.amazonaws.services.dynamodbv2.AmazonDynamoDBClientBuilder;
+import com.amazonaws.services.dynamodbv2.datamodeling.AttributeEncryptor;
+import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBAttribute;
+import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBHashKey;
+import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapper;
+import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperConfig;
+import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperConfig.SaveBehavior;
+import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBRangeKey;
+import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBTable;
+import com.amazonaws.services.dynamodbv2.datamodeling.encryption.DoNotTouch;
+import com.amazonaws.services.dynamodbv2.datamodeling.encryption.DynamoDBEncryptor;
+import com.amazonaws.services.dynamodbv2.datamodeling.encryption.providers.DirectKmsMaterialProvider;
+import com.amazonaws.services.dynamodbv2.model.AttributeValue;
+import com.amazonaws.services.kms.AWSKMS;
+import com.amazonaws.services.kms.AWSKMSClientBuilder;
+
+/**
+ * This demonstrates how to use the {@link DynamoDBMapper} with the {@link AttributeEncryptor}
+ * to encrypt your data. Before you can use this you need to set up a table called "ExampleTable"
+ * to hold the encrypted data.
+ */
+public class AwsKmsEncryptedObject {
+  public static void main(String[] args) throws GeneralSecurityException {
+    final String cmkArn = args[0];
+    final String region = args[1];
+    
+    encryptRecord(cmkArn, region);
+  }
+
+  public static void encryptRecord(final String cmkArn, final String region) {
+    // Sample object to be encrypted
+    DataPoJo record = new DataPoJo();
+    record.setPartitionAttribute("is this");
+    record.setSortAttribute(55);
+    record.setExample("data");
+    record.setSomeNumbers(99);
+    record.setSomeBinary(new byte[]{0x00, 0x01, 0x02});
+    record.setLeaveMe("alone");
+
+    // Set up our configuration and clients
+    final AmazonDynamoDB ddb = AmazonDynamoDBClientBuilder.standard().withRegion(region).build();
+    final AWSKMS kms = AWSKMSClientBuilder.standard().withRegion(region).build();
+    final DirectKmsMaterialProvider cmp = new DirectKmsMaterialProvider(kms, cmkArn);
+    // Encryptor creation
+    final DynamoDBEncryptor encryptor = DynamoDBEncryptor.getInstance(cmp);
+    // Mapper Creation
+    DynamoDBMapperConfig mapperConfig = DynamoDBMapperConfig.builder().withSaveBehavior(SaveBehavior.CLOBBER).build();
+    DynamoDBMapper mapper = new DynamoDBMapper(ddb, mapperConfig, new AttributeEncryptor(encryptor));
+
+    System.out.println("Plaintext Record: " + record);
+    // Save the item to the DynamoDB table
+    mapper.save(record);
+
+    // Retrieve the encrypted item (directly without decrypting) from Dynamo so we can see it in our example
+    final Map<String, AttributeValue> itemKey = new HashMap<>();
+    itemKey.put("partition_attribute", new AttributeValue().withS("is this"));
+    itemKey.put("sort_attribute", new AttributeValue().withN("55"));
+    System.out.println("Encrypted Record: " + ddb.getItem("ExampleTable", itemKey).getItem());
+    
+    // Retrieve (and decrypt) it from DynamoDB
+    DataPoJo decrypted_record = mapper.load(DataPoJo.class, "is this", 55);
+    System.out.println("Decrypted Record: " + decrypted_record);
+  }
+
+  @DynamoDBTable(tableName = "ExampleTable")
+  public static final class DataPoJo {
+    private String partitionAttribute;
+    private int sortAttribute;
+    private String example;
+    private long someNumbers;
+    private byte[] someBinary;
+    private String leaveMe;
+
+    @DynamoDBHashKey(attributeName = "partition_attribute")
+    public String getPartitionAttribute() {
+      return partitionAttribute;
+    }
+
+    public void setPartitionAttribute(String partitionAttribute) {
+      this.partitionAttribute = partitionAttribute;
+    }
+
+    @DynamoDBRangeKey(attributeName = "sort_attribute")
+    public int getSortAttribute() {
+      return sortAttribute;
+    }
+
+    public void setSortAttribute(int sortAttribute) {
+      this.sortAttribute = sortAttribute;
+    }
+
+    @DynamoDBAttribute(attributeName = "example")
+    public String getExample() {
+      return example;
+    }
+
+    public void setExample(String example) {
+      this.example = example;
+    }
+
+    @DynamoDBAttribute(attributeName = "some numbers")
+    public long getSomeNumbers() {
+      return someNumbers;
+    }
+
+    public void setSomeNumbers(long someNumbers) {
+      this.someNumbers = someNumbers;
+    }
+
+    @DynamoDBAttribute(attributeName = "and some binary")
+    public byte[] getSomeBinary() {
+      return someBinary;
+    }
+
+    public void setSomeBinary(byte[] someBinary) {
+      this.someBinary = someBinary;
+    }
+
+    @DynamoDBAttribute(attributeName = "leave me")
+    @DoNotTouch
+    public String getLeaveMe() {
+      return leaveMe;
+    }
+
+    public void setLeaveMe(String leaveMe) {
+      this.leaveMe = leaveMe;
+    }
+
+    @Override
+    public String toString() {
+      return "DataPoJo [partitionAttribute=" + partitionAttribute + ", sortAttribute="
+          + sortAttribute + ", example=" + example + ", someNumbers=" + someNumbers
+          + ", someBinary=" + Arrays.toString(someBinary) + ", leaveMe=" + leaveMe + "]";
+    }
+
+
+  }
+}