Cleanup and modernize S3Adapter to ES6 syntax.

src/Adapters/Files/FilesAdapter.js

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+// Files Adapter
+//
+// Allows you to change the file storage mechanism.
+//
+// Adapter classes must implement the following functions:
+// * createFile(config, filename, data)
+// * getFileData(config, filename)
+// * getFileLocation(config, request, filename)
+//
+// Default is GridStoreAdapter, which requires mongo
+// and for the API server to be using the ExportAdapter
+// database adapter.
+
+export class FilesAdapter {
+  createFile(config, filename, data) { }
+
+  getFileData(config, filename) { }
+
+  getFileLocation(config, filename) { }
+}
+
+export default FilesAdapter;

src/Adapters/Files/GridStoreAdapter.js

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+// GridStoreAdapter
+//
+// Stores files in Mongo using GridStore
+// Requires the database adapter to be based on mongoclient
+
+import { GridStore } from 'mongodb';
+import { FilesAdapter } from './FilesAdapter';
+
+export class GridStoreAdapter extends FilesAdapter {
+  // For a given config object, filename, and data, store a file
+  // Returns a promise
+  createFile(config, filename, data) {
+    return config.database.connect().then(() => {
+      let gridStore = new GridStore(config.database.db, filename, 'w');
+      return gridStore.open();
+    }).then((gridStore) => {
+      return gridStore.write(data);
+    }).then((gridStore) => {
+      return gridStore.close();
+    });
+  }
+
+  getFileData(config, filename) {
+    return config.database.connect().then(() => {
+      return GridStore.exist(config.database.db, filename);
+    }).then(() => {
+      let gridStore = new GridStore(config.database.db, filename, 'r');
+      return gridStore.open();
+    }).then((gridStore) => {
+      return gridStore.read();
+    });
+  }
+
+  getFileLocation(config, filename) {
+    return (config.mount + '/files/' + config.applicationId + '/' + encodeURIComponent(filename));
+  }
+}
+
+export default GridStoreAdapter;

src/Adapters/Files/S3Adapter.js

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+// S3Adapter
+//
+// Stores Parse files in AWS S3.
+
+import * as AWS from 'aws-sdk';
+import { FilesAdapter } from './FilesAdapter';
+
+const DEFAULT_S3_REGION = "us-east-1";
+const DEFAULT_S3_BUCKET = "parse-files";
+
+export class S3Adapter extends FilesAdapter {
+  // Creates an S3 session.
+  // Providing AWS access and secret keys is mandatory
+  // Region and bucket will use sane defaults if omitted
+  constructor(
+    accessKey,
+    secretKey,
+    { region = DEFAULT_S3_REGION,
+      bucket = DEFAULT_S3_BUCKET,
+      bucketPrefix = '',
+      directAccess = false } = {}
+  ) {
+    super();
+
+    this._region = region;
+    this._bucket = bucket;
+    this._bucketPrefix = bucketPrefix;
+    this._directAccess = directAccess;
+
+    let s3Options = {
+      accessKeyId: accessKey,
+      secretAccessKey: secretKey,
+      params: { Bucket: this._bucket }
+    };
+    AWS.config._region = this._region;
+    this._s3Client = new AWS.S3(s3Options);
+  }
+
+  // For a given config object, filename, and data, store a file in S3
+  // Returns a promise containing the S3 object creation response
+  createFile(config, filename, data) {
+    let params = {
+      Key: this._bucketPrefix + filename,
+      Body: data
+    };
+    if (this._directAccess) {
+      params.ACL = "public-read"
+    }
+    return new Promise((resolve, reject) => {
+      this._s3Client.upload(params, (err, data) => {
+        if (err !== null) {
+          return reject(err);
+        }
+        resolve(data);
+      });
+    });
+  }
+
+  // Search for and return a file if found by filename
+  // Returns a promise that succeeds with the buffer result from S3
+  getFileData(config, filename) {
+    let params = {Key: this._bucketPrefix + filename};
+    return new Promise((resolve, reject) => {
+      this._s3Client.getObject(params, (err, data) => {
+        if (err !== null) {
+          return reject(err);
+        }
+        resolve(data.Body);
+      });
+    });
+  }
+
+  // Generates and returns the location of a file stored in S3 for the given request and filename
+  // The location is the direct S3 link if the option is set, otherwise we serve the file through parse-server
+  getFileLocation(config, filename) {
+    if (this._directAccess) {
+      return ('https://' + this.bucket + '._s3Client.amazonaws.com' + '/' + this._bucketPrefix + filename);
+    }
+    return (config.mount + '/files/' + config.applicationId + '/' + encodeURIComponent(filename));
+  }
+}
+
+export default S3Adapter;