s3: add region field to import and restore UI

for s3 v4 compat providers like yandex

fixes cloudron/box#713

src/views/app.html

@@ -191,6 +191,11 @@
               <select class="form-control" name="region" id="inputImportBackupS3Region" ng-model="importBackup.region" ng-options="a.value as a.name for a in s3Regions" ng-disabled="importBackup.busy" ng-required="importBackup.provider === 's3'"></select>
             </div>
 
+            <div class="form-group" ng-class="{ 'has-error': importBackup.error.region }" ng-show="importBackup.provider === 's3-v4-compat'">
+              <label class="control-label" for="inputImportBackupS3V4CompatRegion">Region</label>
+              <input class="form-control" type="text" name="region" id="inputImportBackupS3V4CompatRegion" ng-model="importBackup.region" ng-disabled="importBackup.busy" placeholder="Leave empty to use us-east-1 as default"></input>
+          </div>
+
             <div class="form-group" ng-class="{ 'has-error': importBackup.error.region }" ng-show="importBackup.provider === 'digitalocean-spaces'">
               <label class="control-label" for="inputImportBackupDORegion">Region</label>
               <select class="form-control" name="region" id="inputImportBackupDORegion" ng-model="importBackup.endpoint" ng-options="a.value as a.name for a in doSpacesRegions" ng-disabled="importBackup.busy" ng-required="importBackup.provider === 'digitalocean-spaces'"></select>

src/views/app.js

@@ -941,8 +941,9 @@ angular.module('Application').controller('AppController', ['$scope', '$location'
                     if ($scope.importBackup.region) backupConfig.region = $scope.importBackup.region;
                     delete backupConfig.endpoint;
                 } else if (backupConfig.provider === 'minio' || backupConfig.provider === 's3-v4-compat') {
-                    backupConfig.region = 'us-east-1';
+                    backupConfig.region = backupConfig.region || 'us-east-1';
                     backupConfig.acceptSelfSignedCerts = $scope.importBackup.acceptSelfSignedCerts;
+                    backupConfig.s3ForcePathStyle = true; // might want to expose this in the UI
                 } else if (backupConfig.provider === 'exoscale-sos') {
                     backupConfig.region = 'us-east-1';
                     backupConfig.signatureVersion = 'v4';