Add alicloud oss output binding (#1180)

* add alicloud oss output binding

* split alicloud oss to alibaba cloud section

* typo

* remove redundant text

* Update to new format

* Update yaml

Co-authored-by: Aaron Crawfis <Aaron.Crawfis@microsoft.com>

daprdocs/content/en/operations/components/setup-bindings/supported-bindings/_index.md

@@ -28,6 +28,12 @@ Every binding has its own unique set of properties. Click the name link to see t
 | [Twitter]({{< ref twitter.md >}})       | ✅ | ✅ | Alpha |
 | [SendGrid]({{< ref sendgrid.md >}})       |    | ✅ | Alpha |
 
+### Alibaba Cloud
+
+| Name | Input<br>Binding | Output<br>Binding | Status |
+|------|:----------------:|:-----------------:|--------|
+| [Alibaba Cloud OSS]({{< ref alicloudoss.md >}})           |    | ✅ | Alpha |
+
 ### Amazon Web Services (AWS)
 
 | Name | Input<br>Binding | Output<br>Binding | Status |

daprdocs/content/en/operations/components/setup-bindings/supported-bindings/alicloudoss.md

@@ -0,0 +1,106 @@
+---
+type: docs
+title: "Alibaba Cloud Object Storage Service binding spec"
+linkTitle: "Alibaba Cloud Object Storage"
+description: "Detailed documentation on the Alibaba Cloud Object Storage binding component"
+---
+
+## Component format
+
+To setup an Alibaba Cloud Object Storage binding create a component of type `bindings.alicloud.oss`. See [this guide]({{< ref "howto-bindings.md#1-create-a-binding" >}}) on how to create and apply a secretstore configuration. See this guide on [referencing secrets]({{< ref component-secrets.md >}}) to retrieve and use the secret with Dapr components.
+
+```yaml
+apiVersion: dapr.io/v1alpha1
+kind: Component
+metadata:
+  name: alicloudobjectstorage
+  namespace: default
+spec:
+  type: bindings.alicloud.oss
+  version: v1
+  metadata:
+  - name: endpoint
+    value: "[endpoint]"
+  - name: accessKeyID
+    value: "[key-id]"
+  - name: accessKey
+    value: "[access-key]"
+  - name: bucket
+    value: "[bucket]"
+```
+
+{{% 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 | Details | Example |
+|---------------|----------|---------|---------|
+| `endpoint`    | Y | Alicloud OSS endpoint. | https://oss-cn-hangzhou.aliyuncs.com
+| `accessKeyID` | Y | Access key ID credential. |
+| `accessKey`   | Y | Access key credential. |
+| `bucket`      | Y | Name of the storage bucket. |
+
+## Output operations
+
+The following operations are supported as within the output binding:
+
+### Create object
+
+To perform a create object operation, invoke the binding with a `POST` method and the following JSON body:
+
+```json
+{
+  "operation": "create",
+  "data": "YOUR_CONTENT"
+}
+```
+
+{{% alert title="Note" color="primary" %}}
+By default, a random UUID is auto-generated as the object key. See below for Metadata support to set the key for the object.
+{{% /alert %}}
+
+#### Example
+
+**Saving to a random generated UUID file**
+
+```bash
+curl -d "{ \"operation\": \"create\", \"data\": \"Hello World\" }" http://localhost:<dapr-port>/v1.0/bindings/<binding-name>
+```
+
+<br />
+
+**Saving to a specific file**
+
+```bash
+curl -d "{ \"operation\": \"create\", \"data\": \"Hello World\", \"metadata\": { \"key\": \"my-key\" } }" http://localhost:<dapr-port>/v1.0/bindings/<binding-name>
+```
+
+{{% alert title="Note" color="primary" %}}
+Windows CMD requires escaping the `"` character.
+{{% /alert %}}
+
+## Metadata information
+
+### Object key
+
+By default, the Alicloud OSS output binding will auto-generate a UUID as the object key.
+You can set the key with the following metadata:
+
+```json
+{
+    "data": "file content",
+    "metadata": {
+        "key": "my-key"
+    },
+    "operation": "create"
+}
+```
+
+## Related links
+
+- [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 >}})