Refactor FilesAdapter to ES6 style.

Author: nlutsenko

src/FilesAdapter.js

@@ -3,27 +3,28 @@
 // Allows you to change the file storage mechanism.
 //
 // Adapter classes must implement the following functions:
-// * create(config, filename, data)
-// * get(config, filename)
-// * location(config, req, filename)
+// * createFileAsync(config, filename, data)
+// * getFileDataAsync(config, filename)
+// * getFileLocation(config, request, filename)
 //
 // Default is GridStoreAdapter, which requires mongo
 // and for the API server to be using the ExportAdapter
 // database adapter.
 
-var GridStoreAdapter = require('./GridStoreAdapter');
+var adapter = null;
 
-var adapter = GridStoreAdapter;
-
-function setAdapter(filesAdapter) {
+export function setAdapter(filesAdapter) {
   adapter = filesAdapter;
 }
 
-function getAdapter() {
+export function getAdapter() {
   return adapter;
 }
 
-module.exports = {
-  getAdapter: getAdapter,
-  setAdapter: setAdapter
-};
+export class FilesAdapter {
+  createFileAsync(config, filename, data) { }
+
+  getFileDataAsync(config, filename) { }
+
+  getFileLocation(config, request, filename) { }
+}

src/GridStoreAdapter.js

@@ -4,45 +4,38 @@
 // Requires the database adapter to be based on mongoclient
 
 var GridStore = require('mongodb').GridStore;
-var path = require('path');
 
-// For a given config object, filename, and data, store a file
-// Returns a promise
-function create(config, filename, data) {
-  return config.database.connect().then(() => {
-    var gridStore = new GridStore(config.database.db, filename, 'w');
-    return gridStore.open();
-  }).then((gridStore) => {
-    return gridStore.write(data);
-  }).then((gridStore) => {
-    return gridStore.close();
-  });
-}
+import * as Path from 'path';
+import { FilesAdapter } from './FilesAdapter';
 
-// Search for and return a file if found by filename
-// Resolves a promise that succeeds with the buffer result
-// from GridStore
-function get(config, filename) {
-  return config.database.connect().then(() => {
-    return GridStore.exist(config.database.db, filename);
-  }).then(() => {
-    var gridStore = new GridStore(config.database.db, filename, 'r');
-    return gridStore.open();
-  }).then((gridStore) => {
-    return gridStore.read();
-  });
-}
+export class GridStoreAdapter extends FilesAdapter {
+  // For a given config object, filename, and data, store a file
+  // Returns a promise
+  createFileAsync(config, filename, data) {
+    return config.database.connect().then(() => {
+      var gridStore = new GridStore(config.database.db, filename, 'w');
+      return gridStore.open();
+    }).then((gridStore) => {
+      return gridStore.write(data);
+    }).then((gridStore) => {
+      return gridStore.close();
+    });
+  }
 
-// Generates and returns the location of a file stored in GridStore for the
-// given request and filename
-function location(config, req, filename) {
-  return (req.protocol + '://' + req.get('host') +
-    path.dirname(req.originalUrl) + '/' + req.config.applicationId +
+  getFileDataAsync(config, filename) {
+    return config.database.connect().then(() => {
+      return GridStore.exist(config.database.db, filename);
+    }).then(() => {
+      var gridStore = new GridStore(config.database.db, filename, 'r');
+      return gridStore.open();
+    }).then((gridStore) => {
+      return gridStore.read();
+    });
+  }
+
+  getFileLocation(config, request, filename) {
+    return (request.protocol + '://' + request.get('host') +
+    Path.dirname(request.originalUrl) + '/' + config.applicationId +
     '/' + encodeURIComponent(filename));
+  }
 }
-
-module.exports = {
-  create: create,
-  get: get,
-  location: location
-};

src/files.js

@@ -3,12 +3,13 @@
 var bodyParser = require('body-parser'),
     Config = require('./Config'),
     express = require('express'),
-    FilesAdapter = require('./FilesAdapter'),
     middlewares = require('./middlewares.js'),
     mime = require('mime'),
     Parse = require('parse/node').Parse,
     rack = require('hat').rack();
 
+import { getAdapter as getFilesAdapter } from './FilesAdapter';
+
 var router = express.Router();
 
 var processCreate = function(req, res, next) {
@@ -40,22 +41,21 @@ var processCreate = function(req, res, next) {
   }
 
   var filename = rack() + '_' + req.params.filename + extension;
-  FilesAdapter.getAdapter().create(req.config, filename, req.body)
-  .then(() => {
+  getFilesAdapter().createFileAsync(req.config, filename, req.body).then(() => {
     res.status(201);
-    var location = FilesAdapter.getAdapter().location(req.config, req, filename);
+    var location = getFilesAdapter().getFileLocation(req.config, req, filename);
     res.set('Location', location);
     res.json({ url: location, name: filename });
   }).catch((error) => {
+    console.log(error);
     next(new Parse.Error(Parse.Error.FILE_SAVE_ERROR,
                          'Could not store file.'));
   });
 };
 
 var processGet = function(req, res) {
   var config = new Config(req.params.appId);
-  FilesAdapter.getAdapter().get(config, req.params.filename)
-  .then((data) => {
+  getFilesAdapter().getFileDataAsync(config, req.params.filename).then((data) => {
     res.status(200);
     var contentType = mime.lookup(req.params.filename);
     res.set('Content-type', contentType);

src/index.js

@@ -5,14 +5,16 @@ var batch = require('./batch'),
     cache = require('./cache'),
     DatabaseAdapter = require('./DatabaseAdapter'),
     express = require('express'),
-    FilesAdapter = require('./FilesAdapter'),
     S3Adapter = require('./S3Adapter'),
     middlewares = require('./middlewares'),
     multer = require('multer'),
     Parse = require('parse/node').Parse,
     PromiseRouter = require('./PromiseRouter'),
     httpRequest = require('./httpRequest');
 
+import { setAdapter as setFilesAdapter } from './FilesAdapter';
+import { GridStoreAdapter } from './GridStoreAdapter';
+
 // Mutate the Parse object to add the Cloud Code handlers
 addParseCloud();
 
@@ -47,7 +49,9 @@ function ParseServer(args) {
     DatabaseAdapter.setAdapter(args.databaseAdapter);
   }
   if (args.filesAdapter) {
-    FilesAdapter.setAdapter(args.filesAdapter);
+    setFilesAdapter(args.filesAdapter);
+  } else {
+    setFilesAdapter(new GridStoreAdapter());
   }
   if (args.databaseURI) {
     DatabaseAdapter.setAppDatabaseURI(args.appId, args.databaseURI);