Local Storage binding spec

Detailed documentation on the Local Storage binding component

Component format

To set up the Local Storage binding, create a component of type bindings.localstorage. See this guide on how to create and apply a binding configuration.

apiVersion: dapr.io/v1alpha1
kind: Component
metadata:
  name: <NAME>
spec:
  type: bindings.localstorage
  version: v1
  metadata:
  - name: rootPath
    value: "<string>"

Spec metadata fields

Field Required Binding support Details Example
rootPath Y Output The root path anchor to which files can be read / saved "/temp/files"

Binding support

This component supports output binding with the following operations:

Create file

To perform a create file operation, invoke the Local Storage 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"
}

Examples

Save text to a random generated UUID file

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>


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

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


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

To upload a file, encode it as Base64. The binding should automatically detect the Base64 encoding.


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


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

Response

The response body will contain the following JSON:

{
   "fileName": "<filename>"
}

Get file

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

{
  "operation": "get",
  "metadata": {
    "fileName": "myfile"
  }
}

Example


curl -d '{ \"operation\": \"get\", \"metadata\": { \"fileName\": \"myfile\" }}' http://localhost:<dapr-port>/v1.0/bindings/<binding-name>


curl -d '{ "operation": "get", "metadata": { "fileName": "myfile" }}' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

Response

The response body contains the value stored in the file.

List files

To perform a list files operation, invoke the Local Storage binding with a POST method and the following JSON body:

{
  "operation": "list"
}

If you only want to list the files beneath a particular directory below the rootPath, specify the relative directory name as the fileName in the metadata.

{
  "operation": "list",
  "metadata": {
    "fileName": "my/cool/directory"
  }
}

Example


curl -d '{ \"operation\": \"list\", \"metadata\": { \"fileName\": \"my/cool/directory\" }}' http://localhost:<dapr-port>/v1.0/bindings/<binding-name>


curl -d '{ "operation": "list", "metadata": { "fileName": "my/cool/directory" }}' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

Response

The response is a JSON array of file names.

Delete file

To perform a delete file operation, invoke the Local Storage binding with a POST method and the following JSON body:

{
  "operation": "delete",
  "metadata": {
    "fileName": "myfile"
  }
}

Example


curl -d '{ \"operation\": \"delete\", \"metadata\": { \"fileName\": \"myfile\" }}' http://localhost:<dapr-port>/v1.0/bindings/<binding-name>


curl -d '{ "operation": "delete", "metadata": { "fileName": "myfile" }}' \
      http://localhost:<dapr-port>/v1.0/bindings/<binding-name>

Response

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

Metadata information

By default the Local Storage output binding auto generates a UUID as the file name. It is configurable in the metadata property of the message.

{
    "data": "file content",
    "metadata": {
        "fileName": "filename.txt"
    },
    "operation": "create"
}

Last modified October 11, 2023: Remove direction metadata from output-only bindings (84e9dc15)