上传Base64图片Facebook Graph API

Question

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'),我已设法让上传工作所有的多部分数据等

但是,如果我使用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}}

我已经尝试将其转换为二进制new Buffer(b64string, 'base64');并上传,但没有运气.

我现在已经为此奋斗了3天,所以任何帮助都会非常感激.

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,这对我也有用.

编辑:代码片段

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)]);

Answer 1

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

Answer 2

上面的代码对我来说不太type:"POST",有用(缺少逗号和数据URI到blob函数报告错误.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