Add a new NodeJS Express server generator (#3567)

* create nodejs express esrver

* 1st commit of the express.js module. Express server working, api-docs loads properly. No real paths yet

* 1st commit of the express.js module. Express server working, api-docs loads properly. No real paths yet (#2839)

* Working Express server with successful routing to controllers.

* rewrote controllers and services. Haven't tested yet

* controllers and services have passed tests successfully

* Added documentation

* Added documentation

* Support for openApi v3, using 'express-openapi-validator' for parsing and validation, and an internal router to pass arguments to controllers and services. /controllers/Pet.js and /services/PetService.js should be used for reverse engineering for future codegen script

* update generator and template

* update samples

* more update

* update service, controller

* add vendor extensions

* some updates to adapt to changes in the generator (removing references to swager); some work on handling file uploads; some work on tests

* Update NodeJS server generator and templates based on new output (#3261)

* update generator and template

* update samples

* more update

* update service, controller

* add vendor extensions

* update doc

* Changed routing code to follow the following convention:
Each path operation has a 'x-openapi-router-controller' and 'x-openapi-router-service'. Automated files will be placed under /controllers and /services respectively.
Controller file names will end with 'Controller.js'.
Removed swaggerRouter, replaced it with openapiRouter
Routing works and simple tests show a return of 200 to requests.

* [nodejs-express-server] various updates, fixes (#3319)

* various fix

* remove dot from service

* add space

* better method empty argument

* remove test service (#3379)

* add new doc

* 1. routingTests.js runs through all operations described in openapi.yaml and tries calling them, expecting 200 in return. Currently not all tests pass - not supporting xml, and problems with formData
2. Removed old testing files.
3. Added model files - contain data and structure as defined in openapi.yaml. Model.js has static methods relevant to all model files.
4. Changed openapi.yaml to allow running tests easily.

* 1. routingTests.js runs through all operations described in openapi.yaml and tries calling them, expecting 200 in return. Currently not all tests pass - not supporting xml, and problems with formData (#3442)

2. Removed old testing files.
3. Added model files - contain data and structure as defined in openapi.yaml. Model.js has static methods relevant to all model files.
4. Changed openapi.yaml to allow running tests easily.

* added model classes. Currently as a concept only. Seems like won't be in use

* Updated README.md to be a detailed description of the project.
Removed test files that are not needed.
Removed utils/writer.js which is not needed, and the references to it in the codegen files

* Removed redundant file app.js - this file has no benefit at this point. index.js now calls ExpressServer.js directly. Updated files that used to call app.js. Updated README.md accordingly
Added a path to call the openapi.yaml, and a test file for all endpoints that are not in the openapi.yaml, ensuring that they return 200. Updated README.md accordingly

* Remove test controller (#3575)

* remove test controller

* add back changes to templates

* remove app.js

* update wording

Author: wing328

README.md

@@ -730,6 +730,7 @@ Here is a list of template creators:
    * JAX-RS RestEasy (JBoss EAP): @jfiala
    * Kotlin: @jimschubert [:heart:](https://www.patreon.com/jimschubert)
    * Kotlin (Spring Boot): @dr4ke616
+   * NodeJS Express: @YishTish
    * PHP Laravel: @renepardon
    * PHP Lumen: @abcsun
    * PHP Slim: @jfastnacht

bin/nodejs-express-petstore-server.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+SCRIPT="$0"
+echo "# START SCRIPT: $SCRIPT"
+
+while [ -h "$SCRIPT" ] ; do
+  ls=`ls -ld "$SCRIPT"`
+  link=`expr "$ls" : '.*-> \(.*\)$'`
+  if expr "$link" : '/.*' > /dev/null; then
+    SCRIPT="$link"
+  else
+    SCRIPT=`dirname "$SCRIPT"`/"$link"
+  fi
+done
+
+if [ ! -d "${APP_DIR}" ]; then
+  APP_DIR=`dirname "$SCRIPT"`/..
+  APP_DIR=`cd "${APP_DIR}"; pwd`
+fi
+
+executable="./modules/openapi-generator-cli/target/openapi-generator-cli.jar"
+
+if [ ! -f "$executable" ]
+then
+  mvn -B clean package
+fi
+
+# if you've executed sbt assembly previously it will use that instead.
+export JAVA_OPTS="${JAVA_OPTS} -Xmx1024M -DloggerPath=conf/log4j.properties"
+ags="generate -t modules/openapi-generator/src/main/resources/nodejs-express-server -i modules/openapi-generator/src/test/resources/2_0/petstore.yaml -g nodejs-express-server -o samples/server/petstore/nodejs-express-server -Dservice $@"
+
+java $JAVA_OPTS -jar $executable $ags

docs/generators.md

@@ -94,6 +94,7 @@ The following generators are available:
     - [jaxrs-spec](generators/jaxrs-spec.md)
     - [kotlin-server](generators/kotlin-server.md)
     - [kotlin-spring](generators/kotlin-spring.md)
+    - [nodejs-express-server](generators/nodejs-express-server.md) (beta)
     - [nodejs-server-deprecated](generators/nodejs-server-deprecated.md) (deprecated)
     - [php-laravel](generators/php-laravel.md)
     - [php-lumen](generators/php-lumen.md)

docs/generators/nodejs-express-server.md

@@ -0,0 +1,14 @@
+
+---
+id: generator-opts-server-nodejs-express-server
+title: Config Options for nodejs-express-server
+sidebar_label: nodejs-express-server
+---
+
+| Option | Description | Values | Default |
+| ------ | ----------- | ------ | ------- |
+|sortParamsByRequiredFlag|Sort method arguments to place required parameters before optional parameters.| |true|
+|ensureUniqueParams|Whether to ensure parameter names are unique in an operation (rename parameters that are not).| |true|
+|allowUnicodeIdentifiers|boolean, toggles whether unicode identifiers are allowed in names or not, default is false| |false|
+|prependFormOrBodyParameters|Add form or body parameters to the beginning of the parameter list.| |false|
+|serverPort|TCP port to listen on.| |null|