Cordova: FormData file upload

example.js

  function upload (url, files, config) {
    config = config || {};
    files = angular.isArray(files) ? files : [files];

    config.transformRequest = angular.identity;
    config.headers = config.headers || {};
    config.headers['Content-Type'] = undefined;

    return fileAppender(files).then(function (formData) {

      return $http.post(url, formData, config);
    }, repeatRejection);
  };

services.js

function fileAppenderFactory ($q, $window, $log, safeApply) {

  var mimetypes = {
    // only for example
    'jpg': 'image/jpeg',
    'jpeg': 'image/jpeg',
    'png': 'image/png'
  };

  return function (files, formData) {
    formData = formData || new FormData();

    var fileID = 0;
    return $q.all(files.map(function (fileUri) {

      return addFile(formData, fileUri, 'file' + fileID++);
    })).then(function () {

      return formData;
    }, function (reason) {

      return $q.reject(reason);
    })
  };

  function addFile(form, fileUri, key) {
    $log.debug('Add file: %s', fileUri);
    var deferred = $q.defer();

    $window.resolveLocalFileSystemURL(fileUri, function (fileEntry) {
      fileEntry.file(function (file) {
        var reader = new FileReader();
        reader.onloadend = function (fileReadResult) {
          var data = new Uint8Array(fileReadResult.target.result);
          var blob = createBlob(data, file.type || getMimeType(file.name));
          form.append(key, blob, file.name);

          safeApply(function () {
            deferred.resolve();
          });
        };

        reader.onerror = function (fileReadResult) {

          safeApply(function () {
            deferred.reject(fileReadResult);
          });
        };
        reader.readAsArrayBuffer(file);
      });
    });

    return deferred.promise;
  }

  function createBlob(data, type) {
    var r;
    try {
      r = new $window.Blob([data], {type: type});
    }
    catch (e) {
      // TypeError old chrome and FF
      $window.BlobBuilder = $window.BlobBuilder ||
      $window.WebKitBlobBuilder ||
      $window.MozBlobBuilder ||
      $window.MSBlobBuilder;
      // consider to use crosswalk for android

      if (e.name === 'TypeError' && window.BlobBuilder) {
        var bb = new BlobBuilder();
        bb.append([data.buffer]);
        r = bb.getBlob(type);
      }
      else if (e.name == "InvalidStateError") {
        // InvalidStateError (tested on FF13 WinXP)
        r = new $window.Blob([data.buffer], {type: type});
      }
      else {
        throw e;
      }
    }

    return r;
  }

  function getMimeType(fileName) {
    var extension = fileName.split('.').pop();

    return mimetypes.hasOwnProperty(extension) ?
      mimetypes[extension] : undefined;
  }
}

Thank you, very very much! Was looking all over for this for a while!

This is awesome! Thanks