Add migrate route

src/cloudron.js

@@ -14,6 +14,7 @@ exports = module.exports = {
     updateToLatest: updateToLatest,
     reboot: reboot,
     retire: retire,
+    migrate: migrate,
 
     isConfiguredSync: isConfiguredSync,
 
@@ -709,3 +710,45 @@ function retire(callback) {
     shell.sudo('retire', [ RETIRE_CMD, JSON.stringify(data) ], callback);
 }
 
+function migrate(size, region, callback) {
+    assert.strictEqual(typeof size, 'string');
+    assert.strictEqual(typeof region, 'string');
+    assert.strictEqual(typeof callback, 'function');
+
+    var error = locker.lock(locker.OP_MIGRATE);
+    if (error) return callback(new CloudronError(CloudronError.BAD_STATE, error.message));
+
+    function unlock(error) {
+        if (error) {
+            debug('Failed to migrate', error);
+            locker.unlock(locker.OP_MIGRATE);
+        } else {
+            debug('Migration initiated successfully');
+            // do not unlock; cloudron is migrating
+        }
+
+        return;
+    }
+
+    // initiate the migration in the background
+    backups.backupBoxAndApps({ userId: null, username: 'migrator' }, function (error, backupId) {
+        if (error) return unlock(error);
+
+        debug('migrate: size %s region %s', size, region);
+
+        superagent
+          .post(config.apiServerOrigin() + '/api/v1/boxes/' + config.fqdn() + '/migrate')
+          .query({ token: config.token() })
+          .send({ domain: config.fqdn(), size: size, region: region, restoreKey: backupId })
+          .end(function (error, result) {
+            if (error && !error.response) return unlock(error); // network error
+            if (result.statusCode === 409) return unlock(new CloudronError(CloudronError.BAD_STATE));
+            if (result.statusCode === 404) return unlock(new CloudronError(CloudronError.NOT_FOUND));
+            if (result.statusCode !== 202) return unlock(new CloudronError(CloudronError.EXTERNAL_ERROR, util.format('%s %j', result.status, result.body)));
+
+            unlock(null);
+        });
+    });
+
+    callback(null);
+}