我正在尝试使用Node.js将base64图像上传到FaceBook页面。如果我从文件系统中读取文件（即使用fs.readFileSync（'c：\ a.jpg'）
，我设法让上传工作所有的多部分数据等但是，我应该使用base64编码的图像并尝试上传它，它会给我以下错误：{"error":{"message":"(#1) An unknown error occurred","type":"OAuthException","code":1}}
我已经尝试通过new Buffer(b64string, 'base64');将其转换为二进制并上传，但没有运气。
我现在已经为此奋斗了3天，所以非常感谢任何帮助。
编辑：如果有人也知道如何将base64转换为二进制并成功上传它，那对我也有用。
编辑：代码段
var postDetails = separator + newlineConstant + 'Content-Disposition: form-data;name="access_token"' + newlineConstant + newlineConstant + accessToken + newlineConstant + separator;
postDetails = postDetails + newlineConstant + 'Content-Disposition: form-data; name="message"' + newlineConstant + newlineConstant + message + newlineConstant;
//Add the Image information
var fileDetailsString = '';
var index = 0;
var multipartBody = new Buffer(0);
images.forEach(function (currentImage) {
fileDetailsString = fileDetailsString + separator + newlineConstant + 'Content-Disposition: file; name="source"; filename="Image' + index + '"' + newlineConstant + 'Content-Type: image/jpeg' + newlineConstant + newlineConstant;
index++;
multipartBody = Buffer.concat([multipartBody, new Buffer(fileDetailsString), currentImage]); //This is what I would use if Bianry data was passed in
currentImage = new Buffer (currentImage.toString('base64'), 'base64'); // The following lines are what I would use for base64 image being passed in (The appropriate lines would be enabled/disabled if I was using Binary/base64)
multipartBody = Buffer.concat([multipartBody, new Buffer(fileDetailsString), currentImage]);
});
multipartBody = Buffer.concat([new Buffer(postDetails), multipartBody, new Buffer(footer)]);
答案 0 :(得分：23)
我希望这会有用。通过javascript的帮助将照片上传到FB，您可以使用以下方法。这里需要的是imageData（图像的base64格式）和mime类型。
try {
blob = dataURItoBlob(imageData,mimeType);
} catch (e) {
console.log(e);
}
var fd = new FormData();
fd.append("access_token",accessToken);
fd.append("source", blob);
fd.append("message","Kiss");
try {
$.ajax({
url:"https://graph.facebook.com/" + <<userID received on getting user details>> + "/photos?access_token=" + <<user accessToken>>,
type:"POST",
data:fd,
processData:false,
contentType:false,
cache:false,
success:function(data){
console.log("success " + data);
},
error:function(shr,status,data){
console.log("error " + data + " Status " + shr.status);
},
complete:function(){
console.log("Ajax Complete");
}
});
} catch(e) {
console.log(e);
}
function dataURItoBlob(dataURI,mime) {
// convert base64 to raw binary data held in a string
// doesn't handle URLEncoded DataURIs
var byteString = window.atob(dataURI);
// separate out the mime component
// write the bytes of the string to an ArrayBuffer
//var ab = new ArrayBuffer(byteString.length);
var ia = new Uint8Array(byteString.length);
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
// write the ArrayBuffer to a blob, and you're done
var blob = new Blob([ia], { type: mime });
return blob;
}
//编辑AJAX语法
答案 1 :(得分：14)
上面的代码对我来说不太有用（在type:"POST",之后缺少逗号，而blob函数的数据URI报告错误。我在Firefox和Chrome中使用以下代码：
function PostImageToFacebook(authToken)
{
var canvas = document.getElementById("c");
var imageData = canvas.toDataURL("image/png");
try {
blob = dataURItoBlob(imageData);
}
catch(e) {
console.log(e);
}
var fd = new FormData();
fd.append("access_token",authToken);
fd.append("source", blob);
fd.append("message","Photo Text");
try {
$.ajax({
url:"https://graph.facebook.com/me/photos?access_token=" + authToken,
type:"POST",
data:fd,
processData:false,
contentType:false,
cache:false,
success:function(data){
console.log("success " + data);
},
error:function(shr,status,data){
console.log("error " + data + " Status " + shr.status);
},
complete:function(){
console.log("Posted to facebook");
}
});
}
catch(e) {
console.log(e);
}
}
function dataURItoBlob(dataURI) {
var byteString = atob(dataURI.split(',')[1]);
var ab = new ArrayBuffer(byteString.length);
var ia = new Uint8Array(ab);
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
return new Blob([ab], { type: 'image/png' });
}
这是GitHub上的代码 https://github.com/DanBrown180/html5-canvas-post-to-facebook-base64
答案 2 :(得分：2)
fd.append("no_story", false);
您可以使用照片信息更新用户的墙。
我本来只是留下这个评论但是... 50个评论。
答案 3 :(得分：1)
我做了一些与你的问题非常相似的事情。我有一个网络摄像头快照，需要张贴到Facebook粉丝页面。 设置在一个餐厅，人们可以拍照，然后将其发布到餐馆页面。然后人们会看到发布的facebook-photo的QR码，他们可以选择在自己的个人资料中分享。 希望这可以帮助某人，因为我经常搜索这个工作解决方案
注意：我的图片已经过BASE64编码。
//imageData is a base64 encoded JPG
function postSocial(imageData, message){
var ia = toUInt8Array(imageData);
postImageToFacebook(mAccessTokenPage, "imageName", "image/jpeg",ia, message);
}
function toUInt8Array(dataURI) {
// convert base64 to raw binary data held in a string
// doesn't handle URLEncoded DataURIs
var byteString = window.atob(dataURI);
// write the bytes of the string to an ArrayBuffer
//var ab = new ArrayBuffer(byteString.length);
var ia = new Uint8Array(byteString.length);
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
return ia;
}
function postImageToFacebook( authToken, filename, mimeType, imageData, message ) {
// this is the multipart/form-data boundary we'll use
var boundary = '----ThisIsTheBoundary1234567890';
// let's encode our image file, which is contained in the var
var formData = '--' + boundary + '\r\n'
formData += 'Content-Disposition: form-data; name="source"; filename="' + filename + '"\r\n';
formData += 'Content-Type: ' + mimeType + '\r\n\r\n';
for ( var i = 0; i < imageData.length; ++i )
{
formData += String.fromCharCode( imageData[ i ] & 0xff );
}
formData += '\r\n';
formData += '--' + boundary + '\r\n';
formData += 'Content-Disposition: form-data; name="message"\r\n\r\n';
formData += message + '\r\n'
formData += '--' + boundary + '--\r\n';
var xhr = new XMLHttpRequest();
xhr.open( 'POST', https://graph.facebook.com/ + {PAGE_ID} + "/photos?access_token=" + authToken, true );
xhr.onload = function() {
// ... Fill in your own
//Image was posted
console.log(xhr.responseText);
};
xhr.onerror = function(){
console.log("Error while sending the image to Facebook");
};
xhr.setRequestHeader( "Content-Type", "multipart/form-data; boundary=" + boundary );
xhr.sendAsBinary( formData );
}
答案 4 :(得分：1)
以下是我如何使用facebook JS API将图片发布到Facebook。 我正在使用canvas HTML5功能。每个浏览器都不完全支持它。
首先需要获取图像数据。然后将其封装在表单数据中。 然后，我使用FB.login API来检索访问令牌和用户ID。
var data = $('#map >> canvas').toDataURL('image/png');
var blob;
try {
var byteString = atob(data.split(',')[1]);
var ab = new ArrayBuffer(byteString.length);
var ia = new Uint8Array(ab);
for (var i = 0; i < byteString.length; i++) {
ia[i] = byteString.charCodeAt(i);
}
blob = new Blob([ab], {type: 'image/png'});
} catch (e) {
console.log(e);
}
var fd = new FormData();
fd.append("source", blob);
fd.append("message", "Photo Text");
FB.login(function(){
var auth = FB.getAuthResponse();
$.ajax({
url:"https://graph.facebook.com/"+auth.userID+"/photos?access_token=" + auth.accessToken,
type:"POST",
data:fd,
processData:false,
contentType:false,
cache:false,
success:function(data){
console.log("success " + data);
},
error:function(shr,status,data){
console.log("error " + data + " Status " + shr.status);
},
complete:function(){
console.log("Ajax Complete");
}
});
}, {scope: 'publish_actions'});
答案 5 :(得分：1)
我们可以通过使用现代Fetch API而不是Uint8Array来简化图像重新编码。
var url = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=="
fetch(url)
.then(res => res.blob())
.then(blob => console.log(blob))`
答案 6 :(得分：0)
这是一个不需要jQuery或其他库的示例，只需要本机Fetch API：
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'
});
}
const upload = async (response) => {
let canvas = document.getElementById('canvas');
let dataURL = canvas.toDataURL('image/jpeg', 1.0);
let blob = dataURItoBlob(dataURL);
let formData = new FormData();
formData.append('access_token', response.authResponse.accessToken);
formData.append('source', blob);
let responseFB = await fetch(`https://graph.facebook.com/me/photos`, {
body: formData,
method: 'post'
});
responseFB = await responseFB.json();
console.log(responseFB);
};
document.getElementById('upload').addEventListener('click', () => {
FB.login((response) => {
//TODO check if user is logged in and authorized publish_actions
upload(response);
}, {scope: 'publish_actions'})
})
来源：http://www.devils-heaven.com/facebook-javascript-sdk-photo-upload-from-canvas/