archive: implement unarchive

made a separate route instead of reusing install route. this was
because we want to copy over all the old app config as much as
possible.

src/archives.js

@@ -6,15 +6,18 @@ exports = module.exports = {
     add,
     list,
     listBackupIds,
-    del
+    del,
+    unarchive
 };
 
-const assert = require('assert'),
+const apps = require('./apps.js'),
+    assert = require('assert'),
     BoxError = require('./boxerror.js'),
     database = require('./database.js'),
     eventlog = require('./eventlog.js'),
     safe = require('safetydance'),
-    uuid = require('uuid');
+    uuid = require('uuid'),
+    _ = require('underscore');
 
 const ARCHIVE_FIELDS = [ 'id', 'backupId', 'creationTime', 'appConfigJson', '(icon IS NOT NULL) AS hasIcon', '(appStoreIcon IS NOT NULL) AS hasAppStoreIcon' ];
 
@@ -104,3 +107,32 @@ async function del(archive, auditSource) {
 
     await eventlog.add(eventlog.ACTION_ARCHIVES_DEL, auditSource, { id: archive.id, backupId: archive.backupId });
 }
+
+async function unarchive(archive, data, auditSource) {
+    assert.strictEqual(typeof archive, 'object');
+    assert.strictEqual(typeof data, 'object');
+    assert(auditSource && typeof auditSource === 'object');
+
+    const appConfig = archive.appConfig;
+
+    const dolly = _.pick(appConfig, 'appStoreId', 'manifest', 'memoryLimit', 'cpuQuota', 'crontab', 'reverseProxyConfig', 'env', 'servicesConfig',
+        'tags', 'label', 'enableMailbox', 'mailboxDisplayName', 'mailboxName', 'mailboxDomain', 'enableInbox', 'inboxName', 'inboxDomain', 'devices',
+        'enableTurn', 'enableRedis', 'mounts', 'enableBackup', 'enableAutomaticUpdate', 'accessRestriction', 'operators', 'sso');
+
+    // intentionally not filled up: redirectDomain, aliasDomains, mailboxDomain
+    const newAppData = Object.assign(dolly, {
+        // from request
+        subdomain: data.subdomain,
+        domain: data.domain,
+        secondaryDomains: data.secondaryDomains || {},
+        ports: data.ports || null,
+        overwriteDns: 'overwriteDns' in data ? data.overwriteDns : false,
+        mailboxDomain: data.domain, // archive's mailboxDomain may not exist
+
+        // from the archive
+        icon: archive.icon,
+        backupId: archive.backupId,
+    });
+
+    return await apps.install(newAppData, auditSource);
+}