file api working. Migration script missing

src/js/services/fileStorage.js

@@ -0,0 +1,117 @@
+'use strict';
+
+angular.module('copayApp.services')
+  .factory('fileStorageService', function(lodash, $log) {
+    var root = {}, fs;
+
+
+    root.init = function(cb) {
+      if (fs) return cb(null, fs);
+
+      function onFileSystemSuccess(fileSystem) {
+        console.log('File system started: ', fileSystem.name, fileSystem.root.name);
+        fs = fileSystem;
+        return cb(null, fs);
+      }
+
+      function fail(evt) {
+        var msg = 'Could not init file system: ' + evt.target.error.code;
+        console.log(msg);
+        return cb(msg);
+      };
+
+      window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, onFileSystemSuccess, fail);
+    };
+
+
+    root.get = function(k, cb) {
+      root.init(function(err, fs) {
+        if (err) return cb(err);
+        fs.root.getFile(k, {
+          create: false,
+        }, function(fileEntry) {
+          if (!fileEntry) return cb();
+          fileEntry.file(function(file) {
+            var reader = new FileReader();
+
+            reader.onloadend = function(e) {
+              console.log("Read: " + this.result);
+              return cb(null, this.result)
+            }
+
+            reader.readAsText(file);
+          });
+        }, function(err) {
+          // Not found
+          if (err.code==1) return cb();
+          else return cb(err);
+        });
+      })
+    };
+
+    root.set = function(k, v, cb) {
+      root.init(function(err, fs) {
+        if (err) return cb(err);
+        fs.root.getFile(k, {
+          create: true,
+        }, function(fileEntry) {
+          // Create a FileWriter object for our FileEntry (log.txt).
+          fileEntry.createWriter(function(fileWriter) {
+
+            fileWriter.onwriteend = function(e) {
+              console.log('Write completed.');
+              return cb();
+            };
+
+            fileWriter.onerror = function(e) {
+              console.log('Write failed: ' + e.toString());
+              return cb('Fail to write:', e.toString());
+            };
+
+            if (lodash.isObject(v))
+              v = JSON.stringify(v);
+
+            var blob = new Blob([v], {
+              type: "application/json"
+            });
+
+            fileWriter.write(blob);
+
+          }, cb);
+        });
+
+      });
+    };
+
+    root.remove = function(k, cb) {
+      root.init(function(err, fs) {
+        if (err) return cb(err);
+        fs.root.getFile(k, {
+          create: false,
+        }, function(fileEntry) {
+          // Create a FileWriter object for our FileEntry (log.txt).
+          fileEntry.remove(function() {
+            console.log('File removed.');
+            return cb();
+          }, cb, cb);
+        });
+      });
+    };
+
+    /**
+     * Same as setItem, but fails if an item already exists
+     */
+    root.create = function(name, value, callback) {
+      root.get(name,
+        function(err, data) {
+          if (data) {
+            return callback('EEXISTS');
+          } else {
+            return root.set(name, value, callback);
+          }
+        });
+    };
+
+
+    return root;
+  });