split up backupformat logic into separate files

src/storage.js

@@ -2,13 +2,8 @@
 
 exports = module.exports = {
     api,
-
-    getBackupFilePath,
 };
 
-const assert = require('assert'),
-    path = require('path');
-
 // choose which storage backend we use for test purpose we use s3
 function api(provider) {
     switch (provider) {
@@ -36,19 +31,3 @@ function api(provider) {
     default: return null;
     }
 }
-
-// This is not part of the storage api, since we don't want to pull the "format" logistics into that
-function getBackupFilePath(backupConfig, remotePath, format) {
-    assert.strictEqual(typeof backupConfig, 'object');
-    assert.strictEqual(typeof remotePath, 'string');
-    assert.strictEqual(typeof format, 'string');
-
-    const rootPath = api(backupConfig.provider).getRootPath(backupConfig);
-
-    if (format === 'tgz') {
-        const fileType = backupConfig.encryption ? '.tar.gz.enc' : '.tar.gz';
-        return path.join(rootPath, remotePath + fileType);
-    } else {
-        return path.join(rootPath, remotePath);
-    }
-}