拦截和修改XMLHttpRequests

时间:2020-02-16 21:25:45

标签: javascript ajax asynchronous

我正在编写一个扩展,以使用户能够拦截任何ajax请求并让他们对其进行修改。下面的代码有效。它将拦截xmlhttprequest打开/发送并通过对话框提示我。问题是我在xmlhttprequest.open中使用了hint()而不是我期望它使用的hintOpen()方法。我想知道是否有人对我需要做什么才能使它起作用。

(function(){

    async function promptSend(data){
        return new Promise(function(resolve){
            var swalConfig = {
                html: `<textarea id="swal-input1" class="" rows="10" cols="50"></textarea><br><br>`,
                focusConfirm: false,
                preConfirm: () => {
                    resolve([document.getElementById("swal-input1").value])
                },
                onBeforeOpen: () => {
                    document.getElementById("swal-input1").value = data[0];

                },
                showCancelButton: false,
                allowOutsideClick: false
            };

            try{
                Swal.getQueueStep(); 
                Swal.insertQueueStep(swalConfig)
            }catch(e){
                Swal.queue([swalConfig])            
            }

        });
    }

    async function promptOpen(data){
        return new Promise(function(resolve){
            var swalConfig = {
                html: `<label for='swal-input1'>Method</label><input name='swal-input1' id='swal-input1' style='width:100%'><br><br>`+
                      `<label for='swal-input2'>Url</label><input name='swal-input2' id='swal-input2' style='width:100%'>`,
                focusConfirm: false,
                preConfirm: () => {
                    resolve([document.getElementById("swal-input1").value,document.getElementById("swal-input2").value])
                },
                onBeforeOpen: () => {
                    document.getElementById("swal-input1").value = data[0];
                    document.getElementById("swal-input2").value = data[1];
                },
                showCancelButton: false,
                allowOutsideClick: false
            };

            try{
                Swal.getQueueStep();
                Swal.insertQueueStep(swalConfig)
            }catch(e){
                Swal.queue([swalConfig])            
            }
        })

    }


    // Intercepts all XmlHttpRequest.open calls
    var proxiedOpen = window.XMLHttpRequest.prototype.open;
    window.XMLHttpRequest.prototype.open = function(method, url, async, user, password) {

        //let newArguments = await promptOpen(arguments)
        arguments[0] = prompt("Enter Method",arguments[0])
        arguments[1] = prompt("Enter Url",arguments[1])

        return proxiedOpen.apply(this, [].slice.call(arguments));
    }


    // Intercepts all XmlHttpRequest.send calls
    var proxiedSend = window.XMLHttpRequest.prototype.send;
    window.XMLHttpRequest.prototype.send = async function() {

        let newArgument = await promptSend(arguments);
        arguments[0] = newArgument[0];

        return proxiedSend.apply(this, [].slice.call(arguments));
    }

})()

任何尝试将其转换为promptOpen的尝试都会导致执行的ajax调用调用/ undefined或根本不调用。

我尝试了最明显的方法,即将其转变为异步函数,并使用了诸如xmlhttprequest.send的工作方式。

var proxiedOpen = window.XMLHttpRequest.prototype.open;
window.XMLHttpRequest.prototype.open = async function(method, url, async, user, password) {
    let newArguments = await promptOpen(arguments)
    arguments[0] = newArguments[0]
    arguments[1] = newArguments[1]

    return proxiedOpen.apply(this, [].slice.call(arguments));
}

但是正如我所说,它根本不执行任何ajax请求,甚至不提示xmlhttprequest.send框。

0 个答案:

没有答案