fixes

lib/KnexCrudHandler.ts

@@ -1,4 +1,6 @@
 import { Request, Response } from 'express';
+import { http } from '@scode/consts';
+import { try_parse_json } from '@scode/utilities';
 import { KnexCrudOptions } from './KnexCrudOptions';
 import { CrudHandler } from './CrudHandler';
 
@@ -17,19 +19,44 @@ export class KnexCrudHandler implements CrudHandler {
     this.options = options;
   }
 
-  private call_auth (auth?: Function, req: Request, res: Response): boolean {
+  private call_auth (
+    auth?: Function,
+    req: Request,
+    res: Response
+  ): Promise<boolean> {
     if (typeof auth === 'undefined')
       return true;
 
     const promise = new Promise ((resolve) => {
       const result = auth (req, res, resolve);
+      if (typeof result !== 'undefined')
+        resolve (result);
     });
+
+    return promise;
+  }
+
+  protected validate_body (
+    req: Request,
+    res: Response
+  ): Promise<object> | object {
+    if (typeof req.body === 'undefined') {
+      res.status (http.status_bad_request);
+      res.end ();
+      return null;
+    }
+    return try_parse_json (req.body);
   }
 
   public async create (req: Request, res: Response): Promise<void> {
-    if (typeof req.body === 'undefined')
-      throw new Error ('request body is undefined. is body-parser running?');
-    const data = JSON.parse (req.body);
+    if (!await this.call_auth (this.options.create_authentication, req, res))
+      return;
+    if (!await this.call_auth (this.options.create_authorization, req, res))
+      return;
+
+    const body_data = await this.validate_body (req, res);
+    if (body_data === null)
+      return;
   }
 
   public async read (req: Request, res: Response): Promise<void> {

lib/KnexCrudOptions.ts

@@ -2,12 +2,12 @@ import { Request, Response } from 'express';
 
 type Authentication = {
   (req: Request, res: Response, next: Function);
-  (req: Request, res: Response): boolean;
+  (req: Request, res: Response): Promise<boolean>;
 }
 
 type Authorization = {
   (req: Request, res: Response, next: Function);
-  (req: Request, res: Response): boolean;
+  (req: Request, res: Response): Promise<boolean>;
 }
 
 export class KnexCrudOptions {