first commit

2023-03-28 13:38:29 +08:00 · 2023-03-28 13:38:29 +08:00 · 72e9ee2f8d
commit 72e9ee2f8d
1 changed files with 134 additions and 0 deletions
--- a/Video.js
+++ b/Video.js
@ -0,0 +1,134 @@
+// ==UserScript==
+// @name         央视网视频下载
+// @description  Download videos from cctv.com with one click
+// @namespace    https://iteay.top/
+// @version      1.0
+// @author       BlackTeay
+// @match        https://*.cctv.com/*
+// @require      http://libs.baidu.com/jquery/2.0.0/jquery.min.js
+// @require      https://cdn.bootcdn.net/ajax/libs/downloadjs/1.4.8/download.js
+// @grant        GM_xmlhttpRequest
+// @grant        GM_openInTab
+// @license      MIT
+// ==/UserScript==
+(function () {
+    function findVideoEle(src) {
+
+        let videoJQ = $("#video");
+
+        // 向视频旁边添加【下载】按钮
+        appendDownloadEle(videoJQ, src);
+
+    }
+
+    /**
+     * 向视频上边添加【下载】按钮
+     */
+    function appendDownloadEle(videoJQ, videoSrc) {
+        let downloadIdAttrName = videoJQ.attr("id") + "_download";
+        console.log(downloadIdAttrName)
+        if ($("#" + downloadIdAttrName).length <= 0) {
+            // 【下载】按钮
+            let downloadJQ = $("<a>下载视频</a>");
+            downloadJQ.css({
+                'background-color': 'rgba(255,130,0, 1)',
+                "color": "#fff",
+                'font-size': '15px',
+                'cursor': 'pointer',
+                "border-radius": "5px",
+                "padding": "5px 10px",
+                "display":"inline-block",
+                "margin-top":"1rem",
+                "margin-left":"0.5rem"
+            });
+            downloadJQ.attr("id", downloadIdAttrName);
+            downloadJQ.attr("href", videoSrc);
+            downloadJQ.attr("target", "_balnk");
+            downloadJQ.attr("download","true")
+            videoJQ.parent().after(downloadJQ);
+            // console.log(videoJQ.attr("id") +" 添加下载按钮：" + downloadIdAttrName +", src=" + videoJQ.attr("src"));
+
+            // 为下载按钮绑定单击事件下载视频
+            downloadJQ.on("click", function (event) {
+                // console.log("下载视频：" + $(this).attr("id") + ", href=" +  $(this).attr("href"));
+                // 阻止 a 标签默认行为
+                event.preventDefault();
+                if ($(this).attr("href")) {
+                    // 下载视频
+                    download($(this).attr("href"));
+                    // 打开一个新的标签页面: 新标签页获取页面焦点,新标签页面关闭后，焦点重新回到源页面
+                    GM_openInTab($(this).attr("href"), { active: true, setParent: true });
+
+                }
+            });
+        } else {
+            // console.log(videoJQ.attr("id") +" 已存在下载按钮：" + downloadIdAttrName + ", src=" + videoJQ.attr("src"));
+        }
+    }
+    console.log('加载脚本');
+
+    /**
+     * 拦截并修改ajax请求
+     */
+    window.beforeXMLHttpRequestOpen = function (xhr, options) {
+        //console.log('before open', xhr);
+        // 修改url
+        //options.url = options.url.replace('wd=123', 'wd=456');
+        // 修改method
+        // options.method = 'POST';
+    };
+    /**
+     * 拦截并修改ajax请求
+     */
+    window.beforeXMLHttpRequestSend = function (xhr, body) {
+        //console.log('before send', xhr);
+
+        xhr.onload = () => {
+            if (xhr.status < 200 || xhr.status >= 300) {//非2xx区间状态值走失败
+                console.log(xhr.statusText)
+            }
+
+            var url = new URL(xhr.responseURL)
+            if (url.pathname == '/api/getHttpVideoInfo.do') {
+                var result=JSON.parse(xhr.response);
+                var videoURL=result.video.chapters4[0]["url"];
+                console.log(videoURL);
+                findVideoEle(videoURL);
+            }
+
+        }
+        // 修改请求头
+        //xhr.setRequestHeader('key1', 'value1');
+    };
+
+    /**
+     * 重写open方法
+     * https://developer.mozilla.org/zh-CN/docs/Web/API/XMLHttpRequest/open
+     */
+    XMLHttpRequest.prototype.myOpen = XMLHttpRequest.prototype.open;
+    XMLHttpRequest.prototype.open = function (method, url, async) {
+        // 用对象便于修改参数
+        var options = {
+            method: method,
+            url: url,
+            async: async,
+        };
+        if ('function' === typeof window.beforeXMLHttpRequestOpen) {
+            window.beforeXMLHttpRequestOpen(this, options);
+        }
+        this.myOpen(options.method, options.url, options.async);
+    };
+
+    /**
+     * 重写send方法
+     * https://developer.mozilla.org/zh-CN/docs/Web/API/XMLHttpRequest/send
+     */
+    XMLHttpRequest.prototype.mySend = XMLHttpRequest.prototype.send;
+    XMLHttpRequest.prototype.send = function (body) {
+        if ('function' === typeof window.beforeXMLHttpRequestSend) {
+            window.beforeXMLHttpRequestSend(this, body);
+        }
+        this.mySend(body);
+    };
+
+})();