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docs
AWS S3 binding spec
AWS S3
Detailed documentation on the AWS S3 binding component
/operations/components/setup-bindings/supported-bindings/s3/

Component format

To setup an AWS S3 binding create a component of type bindings.aws.s3. This binding works with other S3-compatible services, such as Minio. See [this guide]({{< ref "howto-bindings.md#1-create-a-binding" >}}) on how to create and apply a binding configuration.

See [Authenticating to AWS]({{< ref authenticating-aws.md >}}) for information about authentication-related attributes.

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
spec:
  type: bindings.aws.s3
  version: v1
  metadata:
  - name: bucket
    value: "mybucket"
  - name: region
    value: "us-west-2"
  - name: endpoint
    value: "s3.us-west-2.amazonaws.com"
  - name: accessKey
    value: "*****************"
  - name: secretKey
    value: "*****************"
  - name: sessionToken
    value: "mysession"
  - name: decodeBase64
    value: "<bool>"
  - name: encodeBase64
    value: "<bool>"
  - name: forcePathStyle
    value: "<bool>"
  - name: disableSSL
    value: "<bool>"
  - name: insecureSSL
    value: "<bool>"
  - name: direction 
    value: "output"

{{% alert title="Warning" color="warning" %}} The above example uses secrets as plain strings. It is recommended to use a secret store for the secrets as described [here]({{< ref component-secrets.md >}}). {{% /alert %}}

Spec metadata fields

Field Required Binding support Details Example
bucket Y Output The name of the S3 bucket to write to "bucket"
region Y Output The specific AWS region "us-east-1"
endpoint N Output The specific AWS endpoint "s3.us-east-1.amazonaws.com"
accessKey Y Output The AWS Access Key to access this resource "key"
secretKey Y Output The AWS Secret Access Key to access this resource "secretAccessKey"
sessionToken N Output The AWS session token to use "sessionToken"
forcePathStyle N Output Currently Amazon S3 SDK supports virtual hosted-style and path-style access. "true" is path-style format like "https://<endpoint>/<your bucket>/<key>". "false" is hosted-style format like "https://<your bucket>.<endpoint>/<key>". Defaults to "false" "true", "false"
decodeBase64 N Output Configuration to decode base64 file content before saving to bucket storage. (In case of saving a file with binary content). "true" is the only allowed positive value. Other positive variations like "True", "1" are not acceptable. Defaults to false "true", "false"
encodeBase64 N Output Configuration to encode base64 file content before return the content. (In case of opening a file with binary content). "true" is the only allowed positive value. Other positive variations like "True", "1" are not acceptable. Defaults to "false" "true", "false"
disableSSL N Output Allows to connect to non https:// endpoints. Defaults to "false" "true", "false"
insecureSSL N Output When connecting to https:// endpoints, accepts invalid or self-signed certificates. Defaults to "false" "true", "false"
direction N Output The direction of the binding "output"

{{% alert title="Important" color="warning" %}} When running the Dapr sidecar (daprd) with your application on EKS (AWS Kubernetes), if you're using a node/pod that has already been attached to an IAM policy defining access to AWS resources, you must not provide AWS access-key, secret-key, and tokens in the definition of the component spec you're using.
{{% /alert %}}

S3 Bucket Creation

{{< tabs "Minio" "LocalStack" "AWS" >}}

{{% codetab %}}

Using with Minio

Minio is a service that exposes local storage as S3-compatible block storage, and it's a popular alternative to S3 especially in development environments. You can use the S3 binding with Minio too, with some configuration tweaks:

  1. Set endpoint to the address of the Minio server, including protocol (http:// or https://) and the optional port at the end. For example, http://minio.local:9000 (the values depend on your environment).
  2. forcePathStyle must be set to true
  3. The value for region is not important; you can set it to us-east-1.
  4. Depending on your environment, you may need to set disableSSL to true if you're connecting to Minio using a non-secure connection (using the http:// protocol). If you are using a secure connection (https:// protocol) but with a self-signed certificate, you may need to set insecureSSL to true.

{{% /codetab %}}

{{% codetab %}} For local development, the LocalStack project is used to integrate AWS S3. Follow these instructions to run LocalStack.

To run LocalStack locally from the command line using Docker, use a docker-compose.yaml similar to the following:

version: "3.8"

services:
  localstack:
    container_name: "cont-aws-s3"
    image: localstack/localstack:1.4.0
    ports:
      - "127.0.0.1:4566:4566"
    environment:
      - DEBUG=1
      - DOCKER_HOST=unix:///var/run/docker.sock
    volumes:
      - "<PATH>/init-aws.sh:/etc/localstack/init/ready.d/init-aws.sh"  # init hook
      - "${LOCALSTACK_VOLUME_DIR:-./volume}:/var/lib/localstack"
      - "/var/run/docker.sock:/var/run/docker.sock"

To use the S3 component, you need to use an existing bucket. The example above uses a LocalStack Initialization Hook to setup the bucket.

To use LocalStack with your S3 binding, you need to provide the endpoint configuration in the component metadata. The endpoint is unnecessary when running against production AWS.

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
    name: aws-s3
    namespace: default
spec:
  type: bindings.aws.s3
  version: v1
  metadata:
    - name: bucket
      value: conformance-test-docker
    - name: endpoint
      value: "http://localhost:4566"
    - name: accessKey
      value: "my-access"
    - name: secretKey
      value: "my-secret"
    - name: region
      value: "us-east-1"

{{% /codetab %}}

{{% codetab %}}

To use the S3 component, you need to use an existing bucket. Follow the AWS documentation for creating a bucket.

{{% /codetab %}}

{{< /tabs >}}

Binding support

This component supports output binding with the following operations:

Create object

To perform a create operation, invoke the AWS S3 binding with a POST method and the following JSON body:

Note: by default, a random UUID is generated. See below for Metadata support to set the name

{
  "operation": "create",
  "data": "YOUR_CONTENT"
}

Share object with a presigned URL

To presign an object with a specified time-to-live, use the presignTTL metadata key on a create request. Valid values for presignTTL are Go duration strings.

{{< tabs Windows Linux >}}

{{% codetab %}}

curl -d "{ \"operation\": \"create\", \"data\": \"Hello World\", \"metadata\": { \"presignTTL\": \"15m\" } }" \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{% codetab %}}

curl -d '{ "operation": "create", "data": "Hello World", "metadata": { "presignTTL": "15m" } }' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{< /tabs >}}

Response

The response body contains the following example JSON:

{
    "location":"https://<your bucket>.s3.<your region>.amazonaws.com/<key>",
    "versionID":"<version ID if Bucket Versioning is enabled>",
    "presignURL": "https://<your bucket>.s3.<your region>.amazonaws.com/image.png?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJJWZ7B6WCRGMKFGQ%2F20180210%2Feu-west-2%2Fs3%2Faws4_request&X-Amz-Date=20180210T171315Z&X-Amz-Expires=1800&X-Amz-Signature=12b74b0788aa036bc7c3d03b3f20c61f1f91cc9ad8873e3314255dc479a25351&X-Amz-SignedHeaders=host"
}

Examples

Save text to a random generated UUID file

{{< tabs Windows Linux >}} {{% codetab %}} On Windows, utilize cmd prompt (PowerShell has different escaping mechanism)

curl -d "{ \"operation\": \"create\", \"data\": \"Hello World\" }" http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{% codetab %}}

curl -d '{ "operation": "create", "data": "Hello World" }' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{< /tabs >}}

Save text to a specific file

{{< tabs Windows Linux >}}

{{% codetab %}}

curl -d "{ \"operation\": \"create\", \"data\": \"Hello World\", \"metadata\": { \"key\": \"my-test-file.txt\" } }" \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{% codetab %}}

curl -d '{ "operation": "create", "data": "Hello World", "metadata": { "key": "my-test-file.txt" } }' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{< /tabs >}}

Save a file to a object

To upload a file, encode it as Base64 and let the Binding know to deserialize it:

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
spec:
  type: bindings.aws.s3
  version: v1
  metadata:
  - name: bucket
    value: mybucket
  - name: region
    value: us-west-2
  - name: endpoint
    value: s3.us-west-2.amazonaws.com
  - name: accessKey
    value: *****************
  - name: secretKey
    value: *****************
  - name: sessionToken
    value: mysession
  - name: decodeBase64
    value: <bool>
  - name: forcePathStyle
    value: <bool>

Then you can upload it as you would normally:

{{< tabs Windows Linux >}}

{{% codetab %}}

curl -d "{ \"operation\": \"create\", \"data\": \"YOUR_BASE_64_CONTENT\", \"metadata\": { \"key\": \"my-test-file.jpg\" } }" http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{% codetab %}}

curl -d '{ "operation": "create", "data": "YOUR_BASE_64_CONTENT", "metadata": { "key": "my-test-file.jpg" } }' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{< /tabs >}}

Upload from file path

To upload a file from a supplied path (relative or absolute), use the filepath metadata key on a create request that contains empty data fields.

{{< tabs Windows Linux >}}

{{% codetab %}}

curl -d '{ \"operation\": \"create\", \"metadata\": { \"filePath\": \"my-test-file.txt\" }}' http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{% codetab %}}

curl -d '{ "operation": "create", "metadata": { "filePath": "my-test-file.txt" }}' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{< /tabs >}}

Response

The response body will contain the following JSON:

{
    "location":"https://<your bucket>.s3.<your region>.amazonaws.com/<key>",
    "versionID":"<version ID if Bucket Versioning is enabled"
}

Presign an existing object

To presign an existing S3 object with a specified time-to-live, use the presignTTL and key metadata keys on a presign request. Valid values for presignTTL are Go duration strings.

{{< tabs Windows Linux >}}

{{% codetab %}}

curl -d "{ \"operation\": \"presign\", \"metadata\": { \"presignTTL\": \"15m\", \"key\": \"my-test-file.txt\" } }" \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{% codetab %}}

curl -d '{ "operation": "presign", "metadata": { "presignTTL": "15m", "key": "my-test-file.txt" } }' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{< /tabs >}}

Response

The response body contains the following example JSON:

{
    "presignURL": "https://<your bucket>.s3.<your region>.amazonaws.com/image.png?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJJWZ7B6WCRGMKFGQ%2F20180210%2Feu-west-2%2Fs3%2Faws4_request&X-Amz-Date=20180210T171315Z&X-Amz-Expires=1800&X-Amz-Signature=12b74b0788aa036bc7c3d03b3f20c61f1f91cc9ad8873e3314255dc479a25351&X-Amz-SignedHeaders=host"
}

Get object

To perform a get file operation, invoke the AWS S3 binding with a POST method and the following JSON body:

{
  "operation": "get",
  "metadata": {
    "key": "my-test-file.txt"
  }
}

The metadata parameters are:

  • key - the name of the object

Example

{{< tabs Windows Linux >}}

{{% codetab %}}

curl -d '{ \"operation\": \"get\", \"metadata\": { \"key\": \"my-test-file.txt\" }}' http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{% codetab %}}

curl -d '{ "operation": "get", "metadata": { "key": "my-test-file.txt" }}' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{< /tabs >}}

Response

The response body contains the value stored in the object.

Delete object

To perform a delete object operation, invoke the AWS S3 binding with a POST method and the following JSON body:

{
  "operation": "delete",
  "metadata": {
    "key": "my-test-file.txt"
  }
}

The metadata parameters are:

  • key - the name of the object

Examples

Delete object

{{< tabs Windows Linux >}}

{{% codetab %}}

curl -d '{ \"operation\": \"delete\", \"metadata\": { \"key\": \"my-test-file.txt\" }}' http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{% codetab %}}

curl -d '{ "operation": "delete", "metadata": { "key": "my-test-file.txt" }}' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

{{% /codetab %}}

{{< /tabs >}}

Response

An HTTP 204 (No Content) and empty body will be returned if successful.

List objects

To perform a list object operation, invoke the S3 binding with a POST method and the following JSON body:

{
  "operation": "list",
  "data": {
    "maxResults": 10,
    "prefix": "file",
    "marker": "hvlcCQFSOD5TD",
    "delimiter": "i0FvxAn2EOEL6"
  }
}

The data parameters are:

  • maxResults - (optional) sets the maximum number of keys returned in the response. By default the action returns up to 1,000 key names. The response might contain fewer keys but will never contain more.
  • prefix - (optional) limits the response to keys that begin with the specified prefix.
  • marker - (optional) marker is where you want Amazon S3 to start listing from. Amazon S3 starts listing after this specified key. Marker can be any key in the bucket. The marker value may then be used in a subsequent call to request the next set of list items.
  • delimiter - (optional) A delimiter is a character you use to group keys.

Response

The response body contains the list of found objects.

The list of objects will be returned as JSON array in the following form:

{
	"CommonPrefixes": null,
	"Contents": [
		{
			"ETag": "\"7e94cc9b0f5226557b05a7c2565dd09f\"",
			"Key": "hpNdFUxruNuwm",
			"LastModified": "2021-08-16T06:44:14Z",
			"Owner": {
				"DisplayName": "owner name",
				"ID": "owner id"
			},
			"Size": 6916,
			"StorageClass": "STANDARD"
		}
	],
	"Delimiter": "",
	"EncodingType": null,
	"IsTruncated": true,
	"Marker": "hvlcCQFSOD5TD",
	"MaxKeys": 1,
	"Name": "mybucketdapr",
	"NextMarker": "hzaUPWjmvyi9W",
	"Prefix": ""
}

Related links

  • [Basic schema for a Dapr component]({{< ref component-schema >}})
  • [Bindings building block]({{< ref bindings >}})
  • [How-To: Trigger application with input binding]({{< ref howto-triggers.md >}})
  • [How-To: Use bindings to interface with external resources]({{< ref howto-bindings.md >}})
  • [Bindings API reference]({{< ref bindings_api.md >}})
  • [Authenticating to AWS]({{< ref authenticating-aws.md >}})