Add conv.canvas.state feature

Bug: 161934922
Change-Id: I59ef8958c196315aa63b14a6ae61d719d29bc646

Author: Fleker

src/service/actionssdk/api/v2.ts

@@ -1726,6 +1726,11 @@ export interface GoogleActionsV2Input {
    * A list of provided argument values for the input requested by the Action.
    */
   arguments?: GoogleActionsV2Argument[]
+  /**
+   * Opaque context set in the interactive canvas web app for all subsequent
+   * intents
+   */
+  canvasState?: ApiClientObjectMap<any>
   /**
    * Indicates the user's intent. For the first conversation turn, the intent
    * will refer to the triggering intent for the Action. For

src/service/actionssdk/conversation/canvas.ts

@@ -0,0 +1,33 @@
+/**
+ * Copyright 2019 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as Api from '../api/v2'
+import { JsonObject } from '../../../common'
+
+export class Canvas {
+  /**
+   * Gets the canvas state
+   *
+   * Accessible using `conv.canvas.state`
+   * @public
+   */
+  state?: JsonObject
+
+  /** @hidden */
+  constructor(user: Api.GoogleActionsV2Input) {
+    this.state = user.canvasState
+  }
+}

src/service/actionssdk/conversation/conversation.ts

@@ -39,6 +39,7 @@ import { Input } from './input'
 import { JsonObject } from '../../../common'
 import { ServiceBaseApp, AppOptions } from '../../../assistant'
 import { OAuth2Client } from 'google-auth-library'
+import { Canvas } from './canvas'
 
 /** @public */
 export type Intent =
@@ -222,6 +223,9 @@ export class Conversation<TUserStorage> {
   /** @public */
   device: Device
 
+  /** @public */
+  canvas: Canvas
+
   /**
    * Gets the unique conversation ID. It's a new ID for the initial query,
    * and stays the same until the end of the conversation.
@@ -328,6 +332,8 @@ export class Conversation<TUserStorage> {
 
     this.device = new Device(this.request.device)
 
+    this.canvas = new Canvas(input)
+
     this.id = conversation.conversationId!
 
     this.type = conversation.type!