test: add test cases for new feature

test/user-original-url.router.spec.ts

@@ -0,0 +1,261 @@
+import { expect } from 'chai';
+import type {
+  Express,
+  IRouter,
+  Response,
+  NextFunction,
+  Request,
+} from 'express';
+import * as express from 'express';
+import { OpenAPIV3 } from '../src/framework/types';
+import * as request from 'supertest';
+import { createApp } from './common/app';
+
+import * as OpenApiValidator from '../src';
+import { Server } from 'http';
+
+interface HTTPError extends Error {
+  status: number;
+  text: string;
+  method: string;
+  path: string;
+}
+
+describe('when useRequestUrl is set to "true" on the child router', async () => {
+  let app: Express & { server?: Server };
+
+  before(async () => {
+    const router = makeRouter({ useRequestUrl: true });
+    app = await makeMainApp();
+    app.use(router);
+  });
+
+  after(() => app?.server?.close());
+
+  it('should apply parent app schema to requests', async () => {
+    const result = await request(app).get('/api/pets/1');
+    const error = result.error as HTTPError;
+    expect(result.statusCode).to.equal(400);
+    expect(error.path).to.equal('/api/pets/1');
+    expect(error.text).to.contain(
+      'Bad Request: request/params/petId must NOT have fewer than 3 characters',
+    );
+  });
+
+  it('should apply child router schema to requests', async () => {
+    const result = await request(app).get('/api/pets/not-uuid');
+    const error = result.error as HTTPError;
+    expect(result.statusCode).to.equal(400);
+    expect(error.path).to.equal('/api/pets/not-uuid');
+    expect(error.text).to.contain(
+      'Bad Request: request/params/petId must match format "uuid&quot',
+    );
+  });
+});
+
+describe('when useRequestUrl is set to "false" on the child router', async () => {
+  let app: Express & { server?: Server };
+
+  before(async () => {
+    const router = makeRouter({ useRequestUrl: false });
+    app = await makeMainApp();
+    app.use(router);
+  });
+
+  after(() => app?.server?.close());
+
+  it('should throw not found', async () => {
+    const result = await request(app).get('/api/pets/valid-pet-id');
+    const error = result.error as HTTPError;
+    expect(result.statusCode).to.equal(404);
+    expect(error.path).to.equal('/api/pets/valid-pet-id');
+    expect(error.text).to.contain('Not Found');
+  });
+});
+
+function defaultResponse(): OpenAPIV3.ResponseObject {
+  return {
+    description: 'unexpected error',
+    content: {
+      'application/json': {
+        schema: {
+          type: 'object',
+          required: ['code', 'message'],
+          properties: {
+            code: {
+              type: 'integer',
+              format: 'int32',
+            },
+            message: {
+              type: 'string',
+            },
+          },
+        },
+      },
+    },
+  };
+}
+
+/* 
+   represents spec of the "public" entrypoint to our application e.g gateway. The
+   type of id in path and id in the response here defined as simple string
+   with minLength
+ */
+const gatewaySpec: OpenAPIV3.Document = {
+  openapi: '3.0.0',
+  info: { version: '1.0.0', title: 'test bug OpenApiValidator' },
+  servers: [{ url: 'http://localhost:3000/api' }],
+  paths: {
+    '/pets/{petId}': {
+      get: {
+        summary: 'Info for a specific pet',
+        operationId: 'showPetById',
+        tags: ['pets'],
+        parameters: [
+          {
+            name: 'petId',
+            in: 'path',
+            required: true,
+            description: 'The id of the pet to retrieve',
+            schema: {
+              type: 'string',
+              minLength: 3,
+            },
+          },
+        ],
+        responses: {
+          '200': {
+            description: 'Expected response to a valid request',
+            content: {
+              'application/json': {
+                schema: {
+                  type: 'object',
+                  required: ['id', 'name'],
+                  properties: {
+                    id: {
+                      type: 'string',
+                    },
+                    name: {
+                      type: 'string',
+                    },
+                    tag: {
+                      type: 'string',
+                    },
+                  },
+                },
+              },
+            },
+          },
+          default: defaultResponse(),
+        },
+      },
+    },
+  },
+};
+
+/*
+ represents spec of the child router. We route request from main app (gateway) to this router.
+ This router has its own schema, routes and validation formats. In particular, we force id in the path and id in the response to be uuid.
+ */
+const childRouterSpec: OpenAPIV3.Document = {
+  openapi: '3.0.0',
+  info: { version: '1.0.0', title: 'test bug OpenApiValidator' },
+  servers: [{ url: 'http://localhost:3000/' }],
+  paths: {
+    '/internal/api/pets/{petId}': {
+      get: {
+        summary: 'Info for a specific pet',
+        operationId: 'showPetById',
+        tags: ['pets'],
+        parameters: [
+          {
+            name: 'petId',
+            in: 'path',
+            required: true,
+            description: 'The id of the pet to retrieve',
+            schema: {
+              type: 'string',
+              format: 'uuid',
+            },
+          },
+        ],
+        responses: {
+          '200': {
+            description: 'Expected response to a valid request',
+            content: {
+              'application/json': {
+                schema: {
+                  type: 'object',
+                  required: ['id', 'name'],
+                  properties: {
+                    id: {
+                      type: 'string',
+                      format: 'uuid',
+                    },
+                    name: {
+                      type: 'string',
+                    },
+                    tag: {
+                      type: 'string',
+                    },
+                  },
+                },
+              },
+            },
+          },
+        },
+      },
+    },
+  },
+};
+
+function redirectToInternalService(
+  req: Request,
+  _res: Response,
+  next: NextFunction,
+): void {
+  req.url = `/internal${req.originalUrl}`;
+  next();
+}
+
+function makeMainApp(): ReturnType<typeof createApp> {
+  return createApp(
+    {
+      apiSpec: gatewaySpec,
+      validateResponses: true,
+      validateRequests: true,
+    },
+    3000,
+    (app) => {
+      app
+        .get(
+          '/api/pets/:petId',
+          function (_req: Request, _res: Response, next: NextFunction) {
+            next();
+          },
+        )
+        .use(redirectToInternalService);
+    },
+    false,
+  );
+}
+
+function makeRouter({ useRequestUrl }: { useRequestUrl: boolean }): IRouter {
+  return express
+    .Router()
+    .use(
+      OpenApiValidator.middleware({
+        apiSpec: childRouterSpec,
+        validateRequests: true,
+        validateResponses: true,
+        useRequestUrl,
+      }),
+    )
+    .get('/internal/api/pets/:petId', function (req, res) {
+      res.json({
+        id: req.params.petId,
+        name: 'Mr Sparky',
+        tag: "Ain't nobody tags me",
+      });
+    });
+}