客户端下载服务器生成的 zip 文件 [英] Client download of a server generated zip file

问题描述

在有人说重复"之前，我只想确保大家知道，我已经查看了这些问题:

Before somebody says, "duplicate", I just want to make sure, that folks know, that I have already reviewed these questions:

1) 使用 angular 和 php，不确定这里发生了什么(我不知道 PHP):下载 zip 文件并触发保存文件"；来自angular方法的对话框

1) Uses angular and php, not sure what is happening here (I don't know PHP): Download zip file and trigger "save file" dialog from angular method

2) 无法得到这个答案来做任何事情:how使用 angular 下载 zip 文件

2) Can't get this answer to do anything: how to download a zip file using angular

3) 这个人已经可以下载了，这已经超出了我想弄清楚的点:从按钮触发的角度下载外部 zip 文件动作

3) This person can already download, which is past the point I'm trying to figure out: Download external zip file from angular triggered on a button action

4) 没有答案:从 nodejs 中的服务器下载 .zip 文件

5) 我什至不知道这是什么语言:https://stackoverflow.com/questions/35596764/zip-file-download-using-angularjs 指令

5) I don't know what language this even is: https://stackoverflow.com/questions/35596764/zip-file-download-using-angularjs-directive

鉴于这些问题，如果这仍然是重复的，我深表歉意.这是这个问题的另一个版本.

Given those questions, if this is still a duplicate, I apologize. Here is, yet, another version of this question.

我的 Angular 1.5.X 客户端给了我一个标题列表，每个标题都有一个关联的文件.我的 Node 4.X/Express 4.X 服务器获取该列表，获取文件位置，创建一个 zip 文件，使用来自 npm 的 express-zip，然后将该文件流式传输回响应.然后我希望我的客户端启动浏览器的下载文件"选项.

My angular 1.5.X client gives me a list of titles, of which each have an associated file. My Node 4.X/Express 4.X server takes that list, gets the file locations, creates a zip file, using express-zip from npm, and then streams that file back in the response. I then want my client to initiate the browser's "download a file" option.

这是我的客户端代码(Angular 1.5.X):

Here's my client code (Angular 1.5.X):

function bulkdownload(titles){
    titles = titles || [];
    if ( titles.length > 0 ) {
        $http.get('/query/bulkdownload',{
            params:{titles:titles},
            responseType:'arraybuffer'
        })
        .then(successCb,errorCb)
        .catch(exceptionCb);
    }

    function successCb(response){
        // This is the part I believe I cannot get to work, my code snippet is below
    };

    function errorCb(error){
            alert('Error: ' + JSON.stringify(error));
    };

    function exceptionCb(ex){
            alert('Exception: ' + JSON.stringify(ex));
    };
};

Node (4.X) 代码，带有 express-zip，https://www.npmjs.com/package/express-zip:

Node (4.X) code with express-zip, https://www.npmjs.com/package/express-zip:

router.get('/bulkdownload',function(req,resp){
    var titles = req.query.titles || [];

    if ( titles.length > 0 ){
        utils.getFileLocations(titles).
        then(function(files){
            let filename = 'zipfile.zip';

            // .zip sets Content-Type and Content-disposition
            resp.zip(files,filename,console.log);
        },
        _errorCb)
    }
});

这是我的客户端代码(Angular 1.5.X)中的 successCb:

Here's my successCb in my client code (Angular 1.5.X):

function successCb(response){
    var URL = $window.URL || $window.webkitURL || $window.mozURL || $window.msURL;
    if ( URL ) {
        var blob = new Blob([response.data],{type:'application/zip'});
        var url = URL.createObjectURL(blob);
        $window.open(url);
    }
};

blob"部分似乎工作正常.在 IE 的调试器中检查它，它确实看起来像一个八位字节信息的文件流.现在，我相信我需要将该 blob 放入一些 HTML5 指令中，以从浏览器启动文件另存为".也许?也许不是?

The "blob" part seems to work fine. Checking it in IE's debugger, it does look like a file stream of octet information. Now, I believe I need to get that blob into the some HTML5 directive, to initiate the "Save File As" from the browser. Maybe? Maybe not?

由于我们 90% 以上的用户都在使用 IE11，所以我在 PhantomJS (Karma) 和 IE 中测试了我的所有 angular.当我运行代码时，我在警报窗口中收到旧的访问被拒绝"错误:

Since 90%+ of our users are using IE11, I test all of my angular in PhantomJS (Karma) and IE. When I run the code, I get the old "Access is denied" error in an alert window:

Exception: {"description":"Access is denied...<stack trace>}

欢迎提出建议、澄清、回答等！

Suggestions, clarifications, answers, etc. are welcome!

推荐答案

我更新了我的 bulkdownload 方法以使用 $window.open(...) 而不是 <代码>$http.get(...):

I updated my bulkdownload method to use $window.open(...) instead of $http.get(...):

function bulkdownload(titles){
    titles = titles || [];
    if ( titles.length > 0 ) {
        var url = '/query/bulkdownload?';
        var len = titles.length;
        for ( var ii = 0; ii < len; ii++ ) {
            url = url + 'titles=' + titles[ii];
            if ( ii < len-1 ) {
                url = url + '&';
            }
        }
        $window.open(url);
    }
};

我只在 IE11 中测试过.

I have only tested this in IE11.

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