GCP Storage Bucket binding spec

Component format

To setup GCP Storage Bucket binding create a component of type bindings.gcp.bucket. See this guide on how to create and apply a binding configuration.

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
spec:
  type: bindings.gcp.bucket
  version: v1
  metadata:
  - name: bucket
    value: "mybucket"
  - name: type
    value: "service_account"
  - name: project_id
    value: "project_111"
  - name: private_key_id
    value: "*************"
  - name: client_email
    value: "name@domain.com"
  - name: client_id
    value: "1111111111111111"
  - name: auth_uri
    value: "https://accounts.google.com/o/oauth2/auth"
  - name: token_uri
    value: "https://oauth2.googleapis.com/token"
  - name: auth_provider_x509_cert_url
    value: "https://www.googleapis.com/oauth2/v1/certs"
  - name: client_x509_cert_url
    value: "https://www.googleapis.com/robot/v1/metadata/x509/<project-name>.iam.gserviceaccount.com"
  - name: private_key
    value: "PRIVATE KEY"
  - name: decodeBase64
    value: "<bool>"
  - name: encodeBase64
    value: "<bool>"

Spec metadata fields

GCP Credentials

Since the GCP Storage Bucket component uses the GCP Go Client Libraries, by default it authenticates using Application Default Credentials. This is explained further in the Authenticate to GCP Cloud services using client libraries guide. Also, see how to Set up Application Default Credentials.

Binding support

This component supports output binding with the following operations:

• create : Create file
• get : Get file
• delete : Delete file
• list: List file

Create file

To perform a create operation, invoke the GCP Storage Bucket 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"
}

The metadata parameters are:

• key - (optional) the name of the object
• decodeBase64 - (optional) configuration to decode base64 file content before saving to storage

Examples

Save text to a random generated UUID file

• Windows
• Linux

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

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

Save text to a specific file

• Windows
• Linux

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

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

Upload a file

To upload a file, pass the file contents as the data payload; you may want to encode this in e.g. Base64 for binary content.

Then you can upload it as you would normally:

• Windows
• Linux

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

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

Response

The response body will contain the following JSON:

{
    "objectURL":"https://storage.googleapis.com/<your bucket>/<key>",
}

Get object

To perform a get file operation, invoke the GCP bucket 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
• encodeBase64 - (optional) configuration to encode base64 file content before return the content.

Example

• Windows
• Linux

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

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

Response

The response body contains the value stored in the object.

Delete object

To perform a delete object operation, invoke the GCP bucket 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

• Windows
• Linux

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

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

Response

An HTTP 204 (No Content) and empty body will be retuned 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",
    "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) it can be used to filter objects starting with prefix.
• delimiter - (optional) it can be used to restrict the results to only the kobjects in the given “directory”. Without the delimiter, the entire tree under the prefix is returned

Response

The response body contains the list of found objects.

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

[
	{
		"Bucket": "<your bucket>",
		"Name": "02WGzEdsUWNlQ",
		"ContentType": "image/png",
		"ContentLanguage": "",
		"CacheControl": "",
		"EventBasedHold": false,
		"TemporaryHold": false,
		"RetentionExpirationTime": "0001-01-01T00:00:00Z",
		"ACL": null,
		"PredefinedACL": "",
		"Owner": "",
		"Size": 5187,
		"ContentEncoding": "",
		"ContentDisposition": "",
		"MD5": "aQdLBCYV0BxA51jUaxc3pQ==",
		"CRC32C": 1058633505,
		"MediaLink": "https://storage.googleapis.com/download/storage/v1/b/<your bucket>/o/02WGzEdsUWNlQ?generation=1631553155678071&alt=media",
		"Metadata": null,
		"Generation": 1631553155678071,
		"Metageneration": 1,
		"StorageClass": "STANDARD",
		"Created": "2021-09-13T17:12:35.679Z",
		"Deleted": "0001-01-01T00:00:00Z",
		"Updated": "2021-09-13T17:12:35.679Z",
		"CustomerKeySHA256": "",
		"KMSKeyName": "",
		"Prefix": "",
		"Etag": "CPf+mpK5/PICEAE="
	}
]

Related links

• Basic schema for a Dapr component
• Bindings building block
• How-To: Trigger application with input binding
• How-To: Use bindings to interface with external resources
• Bindings API reference