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[1.18] bindings/azure/blobstorage: SAS URL support #5079

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bindings/azure/blobstorage: SAS URL support
JoshVanL Mar 19, 2026
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JoshVanL Mar 19, 2026
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84 changes: 82 additions & 2 deletions ...ocs/content/en/reference/components-reference/supported-bindings/blobstorage.md
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,7 @@ This component supports **output binding** with the following operations:
- `get` : [Get blob](#get-blob)
- `delete` : [Delete blob](#delete-blob)
- `list`: [List blobs](#list-blobs)
- `presign`: [Generate presigned SAS URL](#presign-blob)

The Blob storage component's **input binding** triggers and pushes events using [Azure Event Grid]({{% ref eventgrid.md %}}).

Expand Down Expand Up @@ -168,17 +169,45 @@ Then you can upload it as you would normally:

{{< /tabpane >}}

#### Share blob with a presigned SAS URL

To generate a presigned SAS URL when creating a blob, include the `signTTL` metadata key on a `create` request. The SAS URL provides temporary read-only access to the blob.
Valid values for `signTTL` are [Go duration strings](https://pkg.go.dev/time#ParseDuration) (e.g. `"15m"`, `"1h"`, `"24h"`).

> **Note:** This feature requires the binding to be configured with an account key or connection string. Microsoft Entra ID authentication is not supported for SAS URL generation.

{{< tabpane text=true >}}

{{% tab "Windows" %}}
```bash
curl -d "{ \"operation\": \"create\", \"data\": \"Hello World\", \"metadata\": { \"blobName\": \"my-test-file.txt\", \"signTTL\": \"15m\" } }" \
http://localhost:<dapr-port>/v1.0/bindings/<binding-name>
```
{{% /tab %}}

{{% tab "Linux" %}}
```bash
curl -d '{ "operation": "create", "data": "Hello World", "metadata": { "blobName": "my-test-file.txt", "signTTL": "15m" } }' \
http://localhost:<dapr-port>/v1.0/bindings/<binding-name>
```
{{% /tab %}}

{{< /tabpane >}}

#### Response

The response body will contain the following JSON:

```json
{
"blobURL": "https://<your account name>. blob.core.windows.net/<your container name>/<filename>"
"blobURL": "https://<your account name>.blob.core.windows.net/<your container name>/<filename>",
"blobName": "<filename>",
"presignURL": "https://<your account name>.blob.core.windows.net/<your container name>/<filename>?sv=2023-11-03&se=2024-01-01T00%3A15%3A00Z&sr=b&sp=r&sig=<signature>"
}

```

> The `presignURL` field is only present when `signTTL` is provided in the request metadata.

### Get blob

To perform a get blob operation, invoke the Azure Blob Storage binding with a `POST` method and the following JSON body:
Expand Down Expand Up @@ -405,6 +434,57 @@ The list of blobs will be returned as JSON array in the following form:
]
```

### Presign blob

To generate a presigned SAS URL for an existing blob, invoke the Azure Blob Storage binding with a `POST` method and the following JSON body. The SAS URL provides temporary read-only access to the blob without requiring authentication.

> **Note:** This operation requires the binding to be configured with an account key or connection string. Microsoft Entra ID authentication is not supported for SAS URL generation.

```json
{
"operation": "presign",
"metadata": {
"blobName": "my-test-file.txt",
"signTTL": "15m"
}
}
```

The metadata parameters are:

- `blobName` - the name of the blob to generate a SAS URL for
- `signTTL` - the time-to-live for the SAS URL. Valid values are [Go duration strings](https://pkg.go.dev/time#ParseDuration) (e.g. `"15m"`, `"1h"`, `"24h"`)

#### Example

{{< tabpane text=true >}}

{{% tab "Windows" %}}
```bash
curl -d "{ \"operation\": \"presign\", \"metadata\": { \"blobName\": \"my-test-file.txt\", \"signTTL\": \"15m\" } }" \
http://localhost:<dapr-port>/v1.0/bindings/<binding-name>
```
{{% /tab %}}

{{% tab "Linux" %}}
```bash
curl -d '{ "operation": "presign", "metadata": { "blobName": "my-test-file.txt", "signTTL": "15m" } }' \
http://localhost:<dapr-port>/v1.0/bindings/<binding-name>
```
{{% /tab %}}

{{< /tabpane >}}

#### Response

The response body contains the following JSON:

```json
{
"presignURL": "https://<your account name>.blob.core.windows.net/<your container name>/my-test-file.txt?sv=2023-11-03&se=2024-01-01T00%3A15%3A00Z&sr=b&sp=r&sig=<signature>"
}
```

## Metadata information

By default the Azure Blob Storage output binding auto generates a UUID as the blob filename and is not assigned any system or custom metadata to it. It is configurable in the metadata property of the message (all optional).
Expand Down
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