Move middleware utils in middlewares

helpers modules should not import models

server/middlewares/validators/shared/utils.ts

@@ -0,0 +1,50 @@
+import * as express from 'express'
+import { query, validationResult } from 'express-validator'
+import { logger } from '../../../helpers/logger'
+
+function areValidationErrors (req: express.Request, res: express.Response) {
+  const errors = validationResult(req)
+
+  if (!errors.isEmpty()) {
+    logger.warn('Incorrect request parameters', { path: req.originalUrl, err: errors.mapped() })
+    res.fail({
+      message: 'Incorrect request parameters: ' + Object.keys(errors.mapped()).join(', '),
+      instance: req.originalUrl,
+      data: {
+        'invalid-params': errors.mapped()
+      }
+    })
+
+    return true
+  }
+
+  return false
+}
+
+function checkSort (sortableColumns: string[], tags: string[] = []) {
+  return [
+    query('sort').optional().isIn(sortableColumns).withMessage('Should have correct sortable column'),
+
+    (req: express.Request, res: express.Response, next: express.NextFunction) => {
+      logger.debug('Checking sort parameters', { parameters: req.query, tags })
+
+      if (areValidationErrors(req, res)) return
+
+      return next()
+    }
+  ]
+}
+
+function createSortableColumns (sortableColumns: string[]) {
+  const sortableColumnDesc = sortableColumns.map(sortableColumn => '-' + sortableColumn)
+
+  return sortableColumns.concat(sortableColumnDesc)
+}
+
+// ---------------------------------------------------------------------------
+
+export {
+  areValidationErrors,
+  checkSort,
+  createSortableColumns
+}