Cordova上でAngularJSから画像ををform-dataでPOSTする

file_uploader.js

/**
 * require cordova-plugin-file ($cordovaFile)
 */
angular.module('app')
  .factory('FileUploader', ['$q', '$http', '$cordovaFile',function ($q, $http, $cordovaFile) {
      return {
          fileUpload: function (path, fileName) {
              var self = this;
              var fd = new FormData();

              return $q.resolve()
                      .then(function () {
                          return self.getPath(path, fileName)
                      })
                      .then(function (fileEntry) {
                          return self.getFile(fileEntry);
                      })
                      .then(function (file) {
                          return self.getFileReader(file);
                      })
                      .then(function (file) {
                          var imgBlob = new Blob([ file.result ], { type: "image/jpeg" } );
                          fd.append('image', imgBlob);
                          fd.append('file_name', fileName);
                          
                          return $http.post(
                              'http://example.com/api/upload',
                              fd,
                              {
                                  transformRequest: null,
                                  headers: {'Content-type':undefined}
                              }
                          )
                      });
          },
          getPath: function (path, fileName) {
              return $cordovaFile.checkFile(path, fileName);
          },
          getFile: function (fileEntry) {
              var q = $q.defer();
              try {
                  fileEntry.file(function (file) {
                      q.resolve(file);
                  })
              } catch (err) {
                  q.reject(err);
              }
              return q.promise;
          },
          getFileReader: function (file) {
              var q = $q.defer();
              try {
                  var fr = new FileReader();

                  fr.onloadend = function () {
                      q.resolve(this);
                  };

                  fr.onerror = function () {
                      q.reject(this.error);
                  };

                  fr.readAsArrayBuffer(file);
              } catch (err) {
                  q.reject(err);
              }
              return q.promise;
          }
      };
  }])
;