Upload Base64 Image Facebook Graph API

Question

I\'m trying to upload a base64 image to a FaceBook page using Node.js. I have managed to get the upload working with all the multipart data etc should I read the file from t

Answer 1

Here is how I was able to post an image to facebook using the facebook JS API. I am using the canvas HTML5 functionality. It's not fully supported by every browser.

You need first to get the image data. Then to encapsulate it in a form data. I then use the FB.login API in order to retrieve the access token and the userID.

          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'});