add archives api

src/apps.js

@@ -1420,8 +1420,15 @@ async function install(data, auditSource) {
 
     if (constants.DEMO && (await getCount() >= constants.DEMO_APP_LIMIT)) throw new BoxError(BoxError.BAD_STATE, 'Too many installed apps, please uninstall a few and try again');
 
+    let restoreConfig = null;
+    if ('backupId' in data) { // install from archive
+        const backup = await backups.get(data.backupId);
+        if (!backup) throw new BoxError(BoxError.BAD_FIELD, 'Backup not found in archive');
+        restoreConfig = { remotePath: backup.remotePath, backupFormat: backup.format };
+    }
+
     const appId = uuid.v4();
-    debug('Will install app with id : ' + appId);
+    debug(`Installing app ${appId}`);
 
     const app = {
         accessRestriction,
@@ -1455,7 +1462,7 @@ async function install(data, auditSource) {
     await purchaseApp({ appId, appstoreId: appStoreId, manifestId: manifest.id || 'customapp' });
 
     const task = {
-        args: { restoreConfig: null, skipDnsSetup, overwriteDns },
+        args: { restoreConfig, skipDnsSetup, overwriteDns },
         values: { },
         requiredState: app.installationState
     };