将图像从 URL 上传到 Firebase 存储 [英] Upload image from URL to Firebase Storage

问题描述

我想知道如何通过 URL 而不是输入将文件上传到 Firebase 的存储(例如).我正在从网站上抓取图像并检索它们的 URL.我想通过 foreach 语句传递这些 URL 并将它们上传到 Firebase 的存储.现在，我让 firebase upload-via-input 使用以下代码:

I'm wondering how to upload file onto Firebase's storage via URL instead of input (for example). I'm scrapping images from a website and retrieving their URLS. I want to pass those URLS through a foreach statement and upload them to Firebase's storage. Right now, I have the firebase upload-via-input working with this code:

var auth = firebase.auth();
var storageRef = firebase.storage().ref();

function handleFileSelect(evt) {
  evt.stopPropagation();
  evt.preventDefault();
 var file = evt.target.files[0];


  var metadata = {
    'contentType': file.type
  };

  // Push to child path.
  var uploadTask = storageRef.child('images/' + file.name).put(file, metadata);

  // Listen for errors and completion of the upload.
  // [START oncomplete]
  uploadTask.on('state_changed', null, function(error) {
    // [START onfailure]
    console.error('Upload failed:', error);
    // [END onfailure]
  }, function() {
    console.log('Uploaded',uploadTask.snapshot.totalBytes,'bytes.');
    console.log(uploadTask.snapshot.metadata);
    var url = uploadTask.snapshot.metadata.downloadURLs[0];
    console.log('File available at', url);
    // [START_EXCLUDE]
    document.getElementById('linkbox').innerHTML = '<a href="' +  url + '">Click For File</a>';}

问我用什么代替

var 文件 = evt.target.files[0];

var file = evt.target.files[0];

使用外部 URL 而不是手动上传过程?

with to make it work with external URL instead of a manual upload process?

var file = "http://i.imgur.com/eECefMJ.jpg";不起作用！

var file = "http://i.imgur.com/eECefMJ.jpg"; doesn't work!

推荐答案

如果您所做的只是保存 url 路径，则无需使用 Firebase Storage.Firebase 存储用于存储物理文件，而 Firebase 实时数据库可用于存储结构化数据.

There's no need to use Firebase Storage if all you're doing is saving a url path. Firebase Storage is for physical files, while the Firebase Realtime Database could be used for structured data.

示例.一旦您从外部网站获得图片网址，这就是您所需要的:

var externalImageUrl = 'https://foo.com/images/image.png';

然后将其存储在 json 结构化数据库中:

then you would store this in your json structured database:

databaseReference.child('whatever').set(externalImageUrl);

或

如果您想将物理图像直接从外部站点直接下载到存储，那么这将需要发出 http 请求并接收 blob 响应，或者可能需要服务器端语言..

If you want to actually download the physical images straight from external site to storage then this will require making an http request and receiving a blob response or probably may require a server side language ..

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