support fetch and network

Signed-off-by: maosiping <maosiping@huawei.com>

api/@system.fetch.d.ts

@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2022 Huawei Device Co., Ltd.
+ * 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 import fetch from '@system.fetch';
+ * @since 3
+ * @syscap SystemCapability.Communication.NetStack
+ */
+export interface FetchResponse {
+  /**
+   * Server status code.
+   * @since 3
+   */
+  code: number;
+
+  /**
+   * Data returned by the success function.
+   * @since 3
+   */
+  data: string | object;
+
+  /**
+   * All headers in the response from the server.
+   * @since 3
+   */
+  headers: Object;
+}
+
+/**
+ * @import import fetch from '@system.fetch';
+ * @since 3
+ * @syscap SystemCapability.Communication.NetStack
+ */
+export default class Fetch {
+  /**
+   * Obtains data through the network.
+   * @param options
+   */
+  static fetch(options: {
+    /**
+     * Resource URL.
+     * @since 3
+     */
+    url: string;
+
+    /**
+     * Request parameter, which can be of the string type or a JSON object.
+     * @since 3
+     */
+    data?: string | object;
+
+    /**
+     * Request header, which accommodates all attributes of the request.
+     * @since 3
+     */
+    header?: Object;
+
+    /**
+     * Request methods available: OPTIONS, GET, HEAD, POST, PUT, DELETE and TRACE. The default value is GET.
+     * @since 3
+     */
+    method?: string;
+
+    /**
+     * The return type can be text, or JSON. By default, the return type is determined based on Content-Type in the header returned by the server.
+     * @since 3
+     */
+    responseType?: string;
+
+    /**
+     * Called when the network data is obtained successfully.
+     * @since 3
+     */
+    success?: (data: FetchResponse) => void;
+
+    /**
+     * Called when the network data fails to be obtained.
+     * @since 3
+     */
+    fail?: (data: any, code: number) => void;
+
+    /**
+     * Called when the execution is completed.
+     * @since 3
+     */
+    complete?: () => void;
+  }): void;
+}

api/@system.network.d.ts

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2022 Huawei Device Co., Ltd.
+ * 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 import network from '@system.network';
+ * @since 3
+ * @syscap SystemCapability.Communication.NetManager.Core
+ */
+export interface NetworkResponse {
+  /**
+   * Network type. The values can be 2G, 3G, 4G, WiFi, or none.
+   * @since 3
+   */
+  type: string;
+
+  /**
+   * Whether the billing is based on the data volume.
+   * @since 3
+   */
+  metered: boolean;
+}
+
+/**
+ * @import import network from '@system.network';
+ * @since 3
+ * @syscap SystemCapability.Communication.NetManager.Core
+ */
+export default class Network {
+  /**
+   * Obtains the network type.
+   * @param options
+   */
+  static getType(options?: {
+    /**
+     * Called when the network type is obtained.
+     * @since 3
+     */
+    success?: (data: NetworkResponse) => void;
+
+    /**
+     * Called when the network type fails to be obtained.
+     * @since 3
+     */
+    fail?: (data: any, code: number) => void;
+
+    /**
+     * Called when the execution is completed.
+     * @since 3
+     */
+    complete?: () => void;
+  }): void;
+
+  /**
+   * Listens to the network connection state. If this method is called multiple times, the last call takes effect.
+   * @param options
+   */
+  static subscribe(options?: {
+    /**
+     * Called when the network connection state changes.
+     * @since 3
+     */
+    success?: (data: NetworkResponse) => void;
+
+    /**
+     * Called when the listening fails.
+     * @since 3
+     */
+    fail?: (data: any, code: number) => void;
+  }): void;
+
+  /**
+   * Cancels listening to the network connection state.
+   * @param options
+   */
+  static unsubscribe(): void;
+}