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Chapter 32. AWS S3 Storage Service Component

Available as of Camel version 2.8

The S3 component supports storing and retrieving objetcs from/to Amazon’s S3 service.

Prerequisites

You must have a valid Amazon Web Services developer account, and be signed up to use Amazon S3. More information are available at Amazon S3.

32.1. URI Format

aws-s3://bucketNameOrArn[?options]

The bucket will be created if it don’t already exists.
You can append query options to the URI in the following format, ?options=value&option2=value&…

For example in order to read file hello.txt from bucket helloBucket, use the following snippet:

from("aws-s3:helloBucket?accessKey=yourAccessKey&secretKey=yourSecretKey&prefix=hello.txt")
  .to("file:/var/downloaded");

32.2. URI Options

The AWS S3 Storage Service component supports 5 options, which are listed below.

Name	Description	Default	Type
configuration (advanced)	The AWS S3 default configuration		S3Configuration
accessKey (common)	Amazon AWS Access Key		String
secretKey (common)	Amazon AWS Secret Key		String
region (common)	The region where the bucket is located. This option is used in the com.amazonaws.services.s3.model.CreateBucketRequest.		String
resolveProperty Placeholders (advanced)	Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders.	true	boolean

The AWS S3 Storage Service endpoint is configured using URI syntax:

aws-s3:bucketNameOrArn

with the following path and query parameters:

32.2.1. Path Parameters (1 parameters):

Name	Description	Default	Type
bucketNameOrArn	Required Bucket name or ARN		String

32.2.2. Query Parameters (50 parameters):

Name	Description	Default	Type
amazonS3Client (common)	Reference to a com.amazonaws.services.sqs.AmazonS3 in the link:https://camel.apache.org/registry.htmlRegistry.		AmazonS3
pathStyleAccess (common)	Whether or not the S3 client should use path style access	false	boolean
policy (common)	The policy for this queue to set in the com.amazonaws.services.s3.AmazonS3#setBucketPolicy() method.		String
proxyHost (common)	To define a proxy host when instantiating the SQS client		String
proxyPort (common)	Specify a proxy port to be used inside the client definition.		Integer
region (common)	The region in which S3 client needs to work		String
useIAMCredentials (common)	Set whether the S3 client should expect to load credentials on an EC2 instance or to expect static credentials to be passed in.	false	boolean
encryptionMaterials (common)	The encryption materials to use in case of Symmetric/Asymmetric client usage		EncryptionMaterials
useEncryption (common)	Define if encryption must be used or not	false	boolean
bridgeErrorHandler (consumer)	Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.	false	boolean
deleteAfterRead (consumer)	Delete objects from S3 after they have been retrieved. The delete is only performed if the Exchange is committed. If a rollback occurs, the object is not deleted. If this option is false, then the same objects will be retrieve over and over again on the polls. Therefore you need to use the Idempotent Consumer EIP in the route to filter out duplicates. You can filter using the S3Constants#BUCKET_NAME and S3Constants#KEY headers, or only the S3Constants#KEY header.	true	boolean
fileName (consumer)	To get the object from the bucket with the given file name		String
includeBody (consumer)	If it is true, the exchange body will be set to a stream to the contents of the file. If false, the headers will be set with the S3 object metadata, but the body will be null. This option is strongly related to autocloseBody option. In case of setting includeBody to true and autocloseBody to false, it will be up to the caller to close the S3Object stream. Setting autocloseBody to true, will close the S3Object stream automatically.	true	boolean
maxConnections (consumer)	Set the maxConnections parameter in the S3 client configuration	60	int
maxMessagesPerPoll (consumer)	Gets the maximum number of messages as a limit to poll at each polling. Is default unlimited, but use 0 or negative number to disable it as unlimited.	10	int
prefix (consumer)	The prefix which is used in the com.amazonaws.services.s3.model.ListObjectsRequest to only consume objects we are interested in.		String
sendEmptyMessageWhenIdle (consumer)	If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead.	false	boolean
autocloseBody (consumer)	If this option is true and includeBody is true, then the S3Object.close() method will be called on exchange completion. This option is strongly related to includeBody option. In case of setting includeBody to true and autocloseBody to false, it will be up to the caller to close the S3Object stream. Setting autocloseBody to true, will close the S3Object stream automatically.	true	boolean
exceptionHandler (consumer)	To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this option is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.		ExceptionHandler
exchangePattern (consumer)	Sets the exchange pattern when the consumer creates an exchange.		ExchangePattern
pollStrategy (consumer)	A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel.		PollingConsumerPoll Strategy
deleteAfterWrite (producer)	Delete file object after the S3 file has been uploaded	false	boolean
multiPartUpload (producer)	If it is true, camel will upload the file with multi part format, the part size is decided by the option of partSize	false	boolean
operation (producer)	The operation to do in case the user don’t want to do only an upload		S3Operations
partSize (producer)	Setup the partSize which is used in multi part upload, the default size is 25M.	26214400	long
serverSideEncryption (producer)	Sets the server-side encryption algorithm when encrypting the object using AWS-managed keys. For example use AES256.		String
storageClass (producer)	The storage class to set in the com.amazonaws.services.s3.model.PutObjectRequest request.		String
awsKMSKeyId (producer)	Define the id of KMS key to use in case KMS is enabled		String
useAwsKMS (producer)	Define if KMS must be used or not	false	boolean
synchronous (advanced)	Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported).	false	boolean
accelerateModeEnabled ( advanced)	Define if Accelerate Mode enabled is true or false	false	boolean
chunkedEncodingDisabled ( advanced)	Define if disabled Chunked Encoding is true or false	false	boolean
dualstackEnabled ( advanced)	Define if Dualstack enabled is true or false	false	boolean
forceGlobalBucketAccess Enabled ( advanced)	Define if Force Global Bucket Access enabled is true or false	false	boolean
payloadSigningEnabled ( advanced)	Define if Payload Signing enabled is true or false	false	boolean
backoffErrorThreshold (scheduler)	The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in.		int
backoffIdleThreshold (scheduler)	The number of subsequent idle polls that should happen before the backoffMultipler should kick-in.		int
backoffMultiplier (scheduler)	To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the next actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured.		int
delay (scheduler)	Milliseconds before the next poll. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour).	500	long
greedy (scheduler)	If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the previous run polled 1 or more messages.	false	boolean
initialDelay (scheduler)	Milliseconds before the first poll starts. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour).	1000	long
runLoggingLevel (scheduler)	The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that.	TRACE	LoggingLevel
scheduledExecutorService (scheduler)	Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool.		ScheduledExecutor Service
scheduler (scheduler)	To use a cron scheduler from either camel-spring or camel-quartz2 component	none	ScheduledPollConsumer Scheduler
schedulerProperties (scheduler)	To configure additional properties when using a custom scheduler or any of the Quartz2, Spring based scheduler.		Map
startScheduler (scheduler)	Whether the scheduler should be auto started.	true	boolean
timeUnit (scheduler)	Time unit for initialDelay and delay options.	MILLISECONDS	TimeUnit
useFixedDelay (scheduler)	Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details.	true	boolean
accessKey (security)	Amazon AWS Access Key		String
secretKey (security)	Amazon AWS Secret Key		String

32.3. Spring Boot Auto-Configuration

The component supports 34 options, which are listed below.

Name	Description	Default	Type
camel.component.aws-s3.access-key	Amazon AWS Access Key		String
camel.component.aws-s3.configuration.accelerate-mode-enabled	Define if Accelerate Mode enabled is true or false	false	Boolean
camel.component.aws-s3.configuration.access-key	Amazon AWS Access Key		String
camel.component.aws-s3.configuration.amazon-s3-client	Reference to a com.amazonaws.services.sqs.AmazonS3 in the link:https://camel.apache.org/registry.htmlRegistry.		AmazonS3
camel.component.aws-s3.configuration.autoclose-body	If this option is true and includeBody is true, then the S3Object.close() method will be called on exchange completion. This option is strongly related to includeBody option. In case of setting includeBody to true and autocloseBody to false, it will be up to the caller to close the S3Object stream. Setting autocloseBody to true, will close the S3Object stream automatically.	true	Boolean
camel.component.aws-s3.configuration.aws-k-m-s-key-id	Define the id of KMS key to use in case KMS is enabled		String
camel.component.aws-s3.configuration.bucket-name	Name of the bucket. The bucket will be created if it doesn’t already exists.		String
camel.component.aws-s3.configuration.chunked-encoding-disabled	Define if disabled Chunked Encoding is true or false	false	Boolean
camel.component.aws-s3.configuration.delete-after-read	Delete objects from S3 after they have been retrieved. The delete is only performed if the Exchange is committed. If a rollback occurs, the object is not deleted. If this option is false, then the same objects will be retrieve over and over again on the polls. Therefore you need to use the Idempotent Consumer EIP in the route to filter out duplicates. You can filter using the S3Constants#BUCKET_NAME and S3Constants#KEY headers, or only the S3Constants#KEY header.	true	Boolean
camel.component.aws-s3.configuration.delete-after-write	Delete file object after the S3 file has been uploaded	false	Boolean
camel.component.aws-s3.configuration.dualstack-enabled	Define if Dualstack enabled is true or false	false	Boolean
camel.component.aws-s3.configuration.encryption-materials	The encryption materials to use in case of Symmetric/Asymmetric client usage		EncryptionMaterials
camel.component.aws-s3.configuration.file-name	To get the object from the bucket with the given file name		String
camel.component.aws-s3.configuration.force-global-bucket-access-enabled	Define if Force Global Bucket Access enabled is true or false	false	Boolean
camel.component.aws-s3.configuration.include-body	If it is true, the exchange body will be set to a stream to the contents of the file. If false, the headers will be set with the S3 object metadata, but the body will be null. This option is strongly related to autocloseBody option. In case of setting includeBody to true and autocloseBody to false, it will be up to the caller to close the S3Object stream. Setting autocloseBody to true, will close the S3Object stream automatically.	true	Boolean
camel.component.aws-s3.configuration.multi-part-upload	If it is true, camel will upload the file with multi part format, the part size is decided by the option of partSize	false	Boolean
camel.component.aws-s3.configuration.operation	The operation to do in case the user don’t want to do only an upload		S3Operations
camel.component.aws-s3.configuration.part-size	Setup the partSize which is used in multi part upload, the default size is 25M.	26214400	Long
camel.component.aws-s3.configuration.path-style-access	Whether or not the S3 client should use path style access	false	Boolean
camel.component.aws-s3.configuration.payload-signing-enabled	Define if Payload Signing enabled is true or false	false	Boolean
camel.component.aws-s3.configuration.policy	The policy for this queue to set in the com.amazonaws.services.s3.AmazonS3#setBucketPolicy() method.		String
camel.component.aws-s3.configuration.prefix	The prefix which is used in the com.amazonaws.services.s3.model.ListObjectsRequest to only consume objects we are interested in.		String
camel.component.aws-s3.configuration.proxy-host	To define a proxy host when instantiating the SQS client		String
camel.component.aws-s3.configuration.proxy-port	Specify a proxy port to be used inside the client definition.		Integer
camel.component.aws-s3.configuration.region	The region in which S3 client needs to work		String
camel.component.aws-s3.configuration.secret-key	Amazon AWS Secret Key		String
camel.component.aws-s3.configuration.server-side-encryption	Sets the server-side encryption algorithm when encrypting the object using AWS-managed keys. For example use AES256.		String
camel.component.aws-s3.configuration.storage-class	The storage class to set in the com.amazonaws.services.s3.model.PutObjectRequest request.		String
camel.component.aws-s3.configuration.use-aws-k-m-s	Define if KMS must be used or not	false	Boolean
camel.component.aws-s3.configuration.use-encryption	Define if encryption must be used or not	false	Boolean
camel.component.aws-s3.enabled	Enable aws-s3 component	true	Boolean
camel.component.aws-s3.region	The region where the bucket is located. This option is used in the com.amazonaws.services.s3.model.CreateBucketRequest.		String
camel.component.aws-s3.resolve-property-placeholders	Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders.	true	Boolean
camel.component.aws-s3.secret-key	Amazon AWS Secret Key		String

Required S3 component options

You have to provide the amazonS3Client in the Registry or your accessKey and secretKey to access the Amazon’s S3.

32.4. Batch Consumer

This component implements the Batch Consumer.

This allows you for instance to know how many messages exists in this batch and for instance let the Aggregator aggregate this number of messages.

32.5. Usage

32.5.1. Message headers evaluated by the S3 producer

Header	Type	Description
`CamelAwsS3BucketName`	`String`	The bucket Name which this object will be stored or which will be used for the current operation
`CamelAwsS3BucketDestinationName`	`String`	Camel 2.18: The bucket Destination Name which will be used for the current operation
`CamelAwsS3ContentLength`	`Long`	The content length of this object.
`CamelAwsS3ContentType`	`String`	The content type of this object.
`CamelAwsS3ContentControl`	`String`	Camel 2.8.2: The content control of this object.
`CamelAwsS3ContentDisposition`	`String`	Camel 2.8.2: The content disposition of this object.
`CamelAwsS3ContentEncoding`	`String`	Camel 2.8.2: The content encoding of this object.
`CamelAwsS3ContentMD5`	`String`	Camel 2.8.2: The md5 checksum of this object.
`CamelAwsS3DestinationKey`	`String`	Camel 2.18:The Destination key which will be used for the current operation
`CamelAwsS3Key`	`String`	The key under which this object will be stored or which will be used for the current operation
`CamelAwsS3LastModified`	`java.util.Date`	Camel 2.8.2: The last modified timestamp of this object.
`CamelAwsS3Operation`	`String`	Camel 2.18: The operation to perform. Permitted values are copyObject, deleteObject, listBuckets, deleteBucket, downloadLink, listObjects
`CamelAwsS3StorageClass`	`String`	Camel 2.8.4: The storage class of this object.
`CamelAwsS3CannedAcl`	`String`	Camel 2.11.0: The canned acl that will be applied to the object. see `com.amazonaws.services.s3.model.CannedAccessControlList` for allowed values.
`CamelAwsS3Acl`	`com.amazonaws.services.s3.model.AccessControlList`	Camel 2.11.0: a well constructed Amazon S3 Access Control List object. see `com.amazonaws.services.s3.model.AccessControlList` for more details
`CamelAwsS3Headers`	`Map<String,String>`	Camel 2.15.0: support to get or set custom objectMetadata headers.
`CamelAwsS3ServerSideEncryption`	String	Camel 2.16: Sets the server-side encryption algorithm when encrypting the object using AWS-managed keys. For example use AES256.
`CamelAwsS3VersionId`	`String`	The version Id of the object to be stored or returned from the current operation

32.5.2. Message headers set by the S3 producer

Header	Type	Description
`CamelAwsS3ETag`	`String`	The ETag value for the newly uploaded object.
`CamelAwsS3VersionId`	`String`	The optional version ID of the newly uploaded object.
`CamelAwsS3DownloadLinkExpiration`	`String`	The expiration (millis) of URL download link. The link will be stored into CamelAwsS3DownloadLink response header.

32.5.3. Message headers set by the S3 consumer

Header	Type	Description
`CamelAwsS3Key`	`String`	The key under which this object is stored.
`CamelAwsS3BucketName`	`String`	The name of the bucket in which this object is contained.
`CamelAwsS3ETag`	`String`	The hex encoded 128-bit MD5 digest of the associated object according to RFC 1864. This data is used as an integrity check to verify that the data received by the caller is the same data that was sent by Amazon S3.
`CamelAwsS3LastModified`	`Date`	The value of the Last-Modified header, indicating the date and time at which Amazon S3 last recorded a modification to the associated object.
`CamelAwsS3VersionId`	`String`	The version ID of the associated Amazon S3 object if available. Version IDs are only assigned to objects when an object is uploaded to an Amazon S3 bucket that has object versioning enabled.
`CamelAwsS3ContentType`	`String`	The Content-Type HTTP header, which indicates the type of content stored in the associated object. The value of this header is a standard MIME type.
`CamelAwsS3ContentMD5`	`String`	The base64 encoded 128-bit MD5 digest of the associated object (content - not including headers) according to RFC 1864. This data is used as a message integrity check to verify that the data received by Amazon S3 is the same data that the caller sent.
`CamelAwsS3ContentLength`	`Long`	The Content-Length HTTP header indicating the size of the associated object in bytes.
`CamelAwsS3ContentEncoding`	`String`	The optional Content-Encoding HTTP header specifying what content encodings have been applied to the object and what decoding mechanisms must be applied in order to obtain the media-type referenced by the Content-Type field.
`CamelAwsS3ContentDisposition`	`String`	The optional Content-Disposition HTTP header, which specifies presentational information such as the recommended filename for the object to be saved as.
`CamelAwsS3ContentControl`	`String`	The optional Cache-Control HTTP header which allows the user to specify caching behavior along the HTTP request/reply chain.
`CamelAwsS3ServerSideEncryption`	String	Camel 2.16: The server-side encryption algorithm when encrypting the object using AWS-managed keys.

32.5.4. S3 Producer operations

Camel-AWS s3 component provides the following operation on the producer side:

copyObject
deleteObject
listBuckets
deleteBucket
downloadLink
listObjects

32.5.5. Advanced AmazonS3 configuration

If your Camel Application is running behind a firewall or if you need to have more control over the AmazonS3 instance configuration, you can create your own instance:

AWSCredentials awsCredentials = new BasicAWSCredentials("myAccessKey", "mySecretKey");

ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

AmazonS3 client = new AmazonS3Client(awsCredentials, clientConfiguration);

registry.bind("client", client);

and refer to it in your Camel aws-s3 component configuration:

from("aws-s3://MyBucket?amazonS3Client=#client&delay=5000&maxMessagesPerPoll=5")
.to("mock:result");

32.5.6. Use KMS with the S3 component

To use AWS KMS to encrypt/decrypt data by using AWS infrastructure you can use the options introduced in 2.21.x like in the following example

from("file:tmp/test?fileName=test.txt")
     .setHeader(S3Constants.KEY, constant("testFile"))
     .to("aws-s3://mybucket?amazonS3Client=#client&useAwsKMS=true&awsKMSKeyId=3f0637ad-296a-3dfe-a796-e60654fb128c");

In this way you’ll ask to S3, to use the KMS key 3f0637ad-296a-3dfe-a796-e60654fb128c, to encrypt the file test.txt. When you’ll ask to download this file, the decryption will be done directly before the download.

32.5.7. Use "useIAMCredentials" with the s3 component

To use AWS IAM credentials, you must first verify that the EC2 in which you are launching the Camel application on has an IAM role associated with it containing the appropriate policies attached to run effectively. Keep in mind that this feature should only be set to "true" on remote instances. To clarify even further, you must still use static credentials locally since IAM is an AWS specific component, but AWS environments should now be easier to manage. After this is implemented and understood, you can set the query parameter "useIAMCredentials" to "true" for AWS environments! To effectively toggle this on and off based on local and remote environments, you can consider enabling this query parameter with system environment variables. For example, your code could set the "useIAMCredentials" query parameter to "true", when the system environment variable called "isRemote" is set to true (there are many other ways to do this and this should act as a simple example). Although it doesn’t take away the need for static credentials completely, using IAM credentials on AWS environments takes away the need to refresh on remote environments and adds a major security boost (IAM credentials are refreshed automatically every 6 hours and update when their policies are updated). This is the AWS recommended way to manage credentials and therefore should be used as often as possible.

32.6. Dependencies

Maven users will need to add the following dependency to their pom.xml.

pom.xml

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>

where ${camel-version} must be replaced by the actual version of Camel (2.8 or higher).

32.7. See Also

Configuring Camel
Component
Endpoint
Getting Started
AWS Component