Facebook Javascript表单数据照片上传:需要上传文件错误 [英] Facebook Javascript Form Data Photo Upload: requires upload file error
问题描述
我几乎每个帖子都搜索了15个小时,但没有找到问题的答案。我正在使用严格的Javascript使用表单数据将照片上传到Facebook。我使用这种解码方法( canvas元素)解码了base64数据。 binary.jsrel =nofollow> https://github.com/danguer/blog-examples/blob/master/js/base64-binary.js )然后将其转换为表单中的字符串数据格式,如 https://gist.github.com/andyburke/1498758 (不使用XMLHttpRequest) 。然后我将该字符串作为帖子中的source参数。我一直收到(#324)需要上传文件。如果我只是为图像添加一个网址,它的效果非常好。有人可以帮忙吗?谢谢!
I've searched nearly every thread for 15-some hours and haven't found an answer to my problem. I'm using strictly Javascript to upload a photo to Facebook using form data. I decoded the base64 data from my JPEG image (originally svg -> canvas element), using this decode method (https://github.com/danguer/blog-examples/blob/master/js/base64-binary.js) and then converting it to a string in the form data format like https://gist.github.com/andyburke/1498758 (not using XMLHttpRequest). I then put that string as the "source" parameter in the post. I keep getting a "(#324) Requires upload file". It works perfectly if I just put in a url for the image. Can anybody help? Thanks!
// The function to post the image:
FB.api("/me/photos",
"POST",
{
"source": window.image_source,
"message": "...",
"fileName": "..."
},
function(response) {
console.log(response.error);
}
});
// How I got the image_source:
var img = canvas.toDataURL("image/jpeg");
var encoded = img.substring(img.indexOf(',')+1,img.length);
var decoded = decode(encoded);
convertToFormData(decoded);
function convertToFormData(imageData) {
var boundary = 'myboundary';
var formData = "Content-Type: multipart/form-data; boundary=" + boundary + '\r\n\r\n';
formData += '--' + boundary + '\r\n';
formData += 'Content-Disposition: form-data; name="source"; filename="' + "myfile" + '"\r\n';
for ( var i = 0; i < imageData.length; ++i )
formData += String.fromCharCode(imageData[i] & 0xff);
formData += '\r\n';
formData += '--' + boundary + '\r\n'+ 'Content-Disposition: form-data; name="message"\r\n\r\n';
formData += "Description" + '\r\n';
formData += '--' + boundary + '--\r\n';
window.image_source = formData;
}
function decode(input) {
var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
var lkey1 = keyStr.indexOf(input.charAt(input.length-1));
var lkey2 = keyStr.indexOf(input.charAt(input.length-2));
var bytes = (input.length/4) * 3;
if (lkey1 == 64) bytes--;
if (lkey2 == 64) bytes--;
var chr1, chr2, chr3; var enc1, enc2, enc3, enc4;
var i = 0;var j = 0;
var uarray = new Uint8Array(bytes);
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
for (i=0; i<bytes; i+=3) {
enc1 = keyStr.indexOf(input.charAt(j++));
enc2 = keyStr.indexOf(input.charAt(j++));
enc3 = keyStr.indexOf(input.charAt(j++));
enc4 = keyStr.indexOf(input.charAt(j++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
uarray[i] = chr1;
if (enc3 != 64) uarray[i+1] = chr2;
if (enc4 != 64) uarray[i+2] = chr3;
}
return uarray;
}
推荐答案
你必须转动画布将图像转换为Blob以将其上传到Facebook:
You have to turn the Canvas Image into a Blob to upload it to Facebook:
const dataURItoBlob = (dataURI) => {
let byteString = atob(dataURI.split(',')[1]);
let ab = new ArrayBuffer(byteString.length);
let ia = new Uint8Array(ab);
for (let i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
return new Blob([ia], {
type: 'image/jpeg'
});
}
之后,您可以将博客与FormData一起使用:
After that, you can use the blog with FormData:
formData.append('source', blob);
资料来源: http://www.devils-heaven.com/facebook-javascript-sdk-photo-upload-from-canvas/
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