DojoValidators => Add validator for exerciseIdOrUrl

ExpressAPI/assets/OpenAPI/OpenAPI.yaml

 openapi: 3.1.0
 info:
     title: Dojo API
-    version: 3.4.2
+    version: 3.5.0
     description: |
         **Backend API of the Dojo project.**
         

ExpressAPI/src/helpers/DojoValidators.ts

@@ -7,6 +7,8 @@ import express                                                      from 'expres
 import logger                                                       from '../shared/logging/WinstonLogger';
 import Json5FileValidator                                           from '../shared/helpers/Json5FileValidator';
 import ExerciseResultsFile                                          from '../shared/types/Dojo/ExerciseResultsFile';
+import ParamsCallbackManager                                        from '../middlewares/ParamsCallbackManager';
+import ExerciseManager                                              from '../managers/ExerciseManager';
 
 
 declare type DojoMeta = Meta & {
@@ -106,6 +108,32 @@ class DojoValidators {
                                                                               });
                                                                           }
                                                                       });
+
+    readonly exerciseIdOrUrlValidator = this.toValidatorSchemaOptions({
+                                                                          bail        : true,
+                                                                          errorMessage: 'ExerciseIdOrUrl: not provided or invalid',
+                                                                          options     : (_value, {
+                                                                              req,
+                                                                              path
+                                                                          }) => {
+                                                                              return new Promise((resolve, reject) => {
+                                                                                  const exerciseIdOrUrl = this.getParamValue(req, path) as string;
+                                                                                  if ( exerciseIdOrUrl ) {
+                                                                                      ParamsCallbackManager.initBoundParams(req);
+
+                                                                                      ExerciseManager.get(exerciseIdOrUrl).then((exercise) => {
+                                                                                          req.boundParams.exercise = exercise;
+
+                                                                                          exercise !== undefined ? resolve(true) : reject();
+                                                                                      }).catch(() => {
+                                                                                          reject();
+                                                                                      });
+                                                                                  } else {
+                                                                                      reject();
+                                                                                  }
+                                                                              });
+                                                                          }
+                                                                      });
 }