From cb35707c34ba02abb0fcb27899811a4eb0c3ad6e Mon Sep 17 00:00:00 2001
From: Tevin <tingquanren@163.com>
Date: Mon, 22 Feb 2021 10:57:57 +0800
Subject: [PATCH] APP通讯初始化,第一步

---
 common/Bridge.js |  200 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 200 insertions(+), 0 deletions(-)

diff --git a/common/Bridge.js b/common/Bridge.js
index e69de29..f1cec46 100644
--- a/common/Bridge.js
+++ b/common/Bridge.js
@@ -0,0 +1,200 @@
+/**
+ * 跨端双向通讯桥
+ * @author Tevin
+ * @tutorial
+ *  网页对 app 发起通讯
+ *      1. app 注册接收机制
+ *          app 在网页打开之前,注入方法 linking
+ *      2. js 发起
+ *          bridge.invoking('methodName', {key1:'value1'}, function(res){console.log(res)});
+ *      3. Bridge 转换为发送
+ *          window.linking('{method:\'methodName\', param:{key1:\'value1\'}, callback:\'bridge.cb111at1541994536008\'}');
+ *      4. app 处理完后直接调用网页上的回调,并传递结果
+ *          bridge.cb101at1541994536008('{key2:\'value2\'}');
+ *  app 对网页发起通讯
+ *      1. 网页注册接收器,用于接收 app
+ *          window.telling = function(dataStr) {};
+ *      2. 网页注册业务
+ *          bridge.register('methodName', function(data, callback){});
+ *      3. app 调用(至少需要在页面完成再延迟至少1秒之后)
+ *          telling('{method:\'methodName\', param:{key1:\'value1\'}, marker:\'mk222at1541994536008\'}');
+ *      4. 网页完成业务逻辑处理,并回调
+ *          window.linking('{method:\'methodName\', param:{key2:\'value2\'}, marker:\'mk222at1541994536008\'}');
+ */
+
+
+export class Bridge {
+
+    constructor() {
+        this._data = {
+            count: 100,
+        };
+        this._receives = {};
+        this._init();
+    }
+
+    /**
+     * 检查 linking 方法
+     * @return {string}
+     * @private
+     */
+    _checkLinking() {
+        // 安卓注入
+        if (window.iTop && window.iTop.linking) {
+            return 'android';
+        }
+        // 没有注入
+        else {
+            return '';
+        }
+    }
+
+    /**
+     * 初始化
+     * @private
+     */
+    _init(count = 0) {
+        // 500 * 20 毫秒后,仍然未注入,视为不工作
+        if (!this._checkLinking() && count < 20) {
+            setTimeout(() => {
+                this._init(++count);
+            }, 500);
+        } else {
+            this._initReceive();
+        }
+    }
+
+    /**
+     * 发送
+     * @param {object} data
+     * @private
+     */
+    _send(data) {
+        const platform = this._checkLinking();
+        // 安卓注入
+        if (platform === 'android') {
+            window.iTop.linking(JSON.stringify(data));
+        }
+        // 没有注入
+        else {
+            console.error('没有注入 linking 方法!');
+        }
+    }
+
+    /**
+     * 发起一次发送
+     * @param {string} method
+     * @param {object} param
+     * @param {function} callback - 来自网页业务逻辑的回调
+     * @private
+     */
+    _sendLinking(method, param, callback) {
+        // 数据检查
+        if (Object.prototype.toString.call(param) !== '[object Object]') {
+            console.error('$bridge.invoking 需要接受 JSON 对象!');
+            return;
+        }
+        // 如果有回调,转存回调
+        const name = 'cb' + this._data.count++ + 'at' + Date.now();
+        this[name] = (res) => {
+            if (callback && Object.prototype.toString.call(callback) === '[object Function]') {
+                if (res) {
+                    const data = typeof res === 'string' ? JSON.parse(res) : res;
+                    callback(data);
+                } else {
+                    callback();
+                }
+            }
+            delete this[name];
+        };
+        // 发送
+        this._send({
+            method,
+            param,
+            callback: 'bridge.' + name,
+        });
+    }
+
+    /**
+     * 向 app 发起通讯
+     * @param {string} method
+     * @param {object|function} [param]
+     * @param {function} [callback]
+     */
+    invoking(method, param, callback) {
+        const trans = param;
+        if (trans) {
+            if (Object.prototype.toString.call(trans) === '[object Function]') {
+                callback = trans;
+                param = {};
+            }
+        } else {
+            callback = null;
+            param = {};
+        }
+        this._sendLinking(method, param, callback);
+    }
+
+    /**
+     * 初始化接收
+     * @private
+     */
+    _initReceive() {
+        if (!this._checkLinking()) {
+            return;
+        }
+        window.telling = (res) => {
+            const data = typeof res === 'string' ? JSON.parse(res) : res;
+            const method = data.method;
+            const param = data.param;
+            const marker = data.marker;
+            if (this._receives[method]) {
+                this._receives[method](param, (param2) => {
+                    this._sendTelling(method, param2, marker);
+                });
+            }
+        };
+    }
+
+    /**
+     * 发送响应
+     * @param {string} method
+     * @param {object} param
+     * @param {string} marker
+     * @private
+     */
+    _sendTelling(method, param, marker) {
+        // 数据检查
+        if (Object.prototype.toString.call(param) !== '[object Object]') {
+            console.error('$bridge.register 注册的函数需要接受 JSON 对象!');
+            return;
+        }
+        // 发送
+        this._send({
+            method,
+            param,
+            marker,
+        });
+    }
+
+    /**
+     * 注册接收指令,可供 app 查询
+     * @param method
+     * @param callback
+     */
+    register(method, callback) {
+        this._receives[method] = callback;
+    }
+
+    /**
+     * 是否有开始工作
+     */
+    isWorking() {
+        const platform = this._checkLinking();
+        return platform === 'android' || platform === 'iOS';
+    }
+
+}
+
+// 全局服务实例
+export const $bridge = new Bridge();

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