split aws code into storage backends

src/storage/s3.js

@@ -0,0 +1,91 @@
+/* jslint node:true */
+
+'use strict';
+
+exports = module.exports = {
+    getSignedUploadUrl: getSignedUploadUrl,
+    getSignedDownloadUrl: getSignedDownloadUrl,
+
+    copyObject: copyObject
+};
+
+var assert = require('assert'),
+    AWS = require('aws-sdk'),
+    config = require('../config.js');
+
+function getBackupCredentials(callback) {
+    assert.strictEqual(typeof callback, 'function');
+
+    if (!config.aws().accessKeyId || !config.aws().secretAccessKey) return callback(new Error('missing credentials'));
+
+    var credentials = {
+        accessKeyId: config.aws().accessKeyId,
+        secretAccessKey: config.aws().secretAccessKey,
+        region: 'us-east-1'
+    };
+
+    if (config.aws().endpoint) credentials.endpoint = new AWS.Endpoint(config.aws().endpoint);
+
+    callback(null, credentials);
+}
+
+function getSignedUploadUrl(filename, callback) {
+    assert.strictEqual(typeof filename, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    getBackupCredentials(function (error, credentials) {
+        if (error) return callback(error);
+
+        var s3 = new AWS.S3(credentials);
+
+        var params = {
+            Bucket: config.aws().backupBucket,
+            Key: config.aws().backupPrefix + '/' + filename,
+            Expires: 60 * 30 /* 30 minutes */
+        };
+
+        var url = s3.getSignedUrl('putObject', params);
+
+        callback(null, { url : url, sessionToken: credentials.sessionToken });
+    });
+}
+
+function getSignedDownloadUrl(filename, callback) {
+    assert.strictEqual(typeof filename, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    getBackupCredentials(function (error, credentials) {
+        if (error) return callback(error);
+
+        var s3 = new AWS.S3(credentials);
+
+        var params = {
+            Bucket: config.aws().backupBucket,
+            Key: config.aws().backupPrefix + '/' + filename,
+            Expires: 60 * 30 /* 30 minutes */
+        };
+
+        var url = s3.getSignedUrl('getObject', params);
+
+        callback(null, { url: url, sessionToken: credentials.sessionToken });
+    });
+}
+
+function copyObject(from, to, callback) {
+    assert.strictEqual(typeof from, 'string');
+    assert.strictEqual(typeof to, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    getBackupCredentials(function (error, credentials) {
+        if (error) return callback(error);
+
+        var params = {
+            Bucket: config.aws().backupBucket, // target bucket
+            Key: config.aws().backupPrefix + '/' + to, // target file
+            CopySource: config.aws().backupBucket + '/' + config.aws().backupPrefix + '/' + from, // source
+        };
+
+        var s3 = new AWS.S3(credentials);
+        s3.copyObject(params, callback);
+    });
+}