javascript - 如何在 Node.js 中将图像发布到 Twitter

Question

当我尝试将 PNG 图像上传到 Node 中的 Twit 库时，出现错误。

我试图在 Node.js 中制作一个 Twitter 机器人，它生成随机 rgb 颜色，创建这种颜色的图片并发布推文。在 another question 的帮助下我现在知道如何在 Node 中创建 PNG Canvas ，但我不确定如何将它放入 Twit 库中。使用下面的代码我得到一个错误:44, message: 'media_ids parameter is invalid.' 这似乎来自 Twitter API。

官方 Twitter 文档说:

You may either upload the raw binary of the file or its base64-encoded contents.

我不确定该怎么做。我怎样才能让 Twitter API 接受我的 Canvas 作为 PNG 图像？

我的代码是:

var Twit = require('twit')
var Canvas = require('canvas');
var Image = Canvas.Image;


var T = new Twit({
    consumer_key:         '###'
  , consumer_secret:      '###'
  , access_token:         '###'
  , access_token_secret:  '###'
})

//Generate the canvas
var canvas = new Canvas(800, 800);
var context = canvas.getContext('2d');

function tweet() {

//Generate a random colour
var r = Math.floor((Math.random() * 256));
var g = Math.floor((Math.random() * 256));
var b = Math.floor((Math.random() * 256));
var color = "rgb("+r+","+g+","+b+")";

    // draw box
    context.beginPath();
    context.moveTo(0, 00);
    context.lineTo(0, 800);
    context.lineTo(800, 800);
    context.lineTo(800, 0);
    context.closePath();
    context.lineWidth = 5;
    context.fillStyle = color;
    context.fill();

var fs = require('fs')
  ,  out = fs.createWriteStream(__dirname + '/text.png')   
  , stream = canvas.pngStream();
var dataUrl = canvas.pngStream().pipe(out);
//I'm not sure if this bit is really necessary

    // first we must post the media to Twitter
T.post('media/upload', { media_data: canvas.toBuffer() }, function (err, data, response) {

  // now we can reference the media and post a tweet (media will attach to the tweet)
  var mediaIdStr = data.media_id_string
  var params = { status: color, media_ids: [mediaIdStr] }

  T.post('statuses/update', params, function (err, data, response) {
    console.log(data)
  })
})

}
    setTimeout(tweet, 30000);

Answer 1

推特docs说说使用 media/upload:

Parameters

media - The raw binary file content being uploaded. Cannot be used with media_data.

media_data - The base64-encoded file content being uploaded. Cannot be used with media.

您正在向此处的 media_data 参数提供原始数据:media_data: canvas.toBuffer()

要解决此问题，请上传 base64 编码的图像:

T.post('media/upload', { media_data: canvas.toBuffer().toString('base64') }, function (err, data, response) {