express-gateway | A microservices API Gateway built on top of Express.js | REST library

networks:
  goodfood:
    driver: bridge

services:

  gateway:
    container_name: gateway
    image: 'node:17-alpine'
    # env_file:
    #   - ./gateway/.env
    working_dir: /usr/src/app
    volumes:
      - './gateway:/usr/src/app'
    command: npm run dev
    ports:
      - '8080:8080'
    networks:
      - goodfood

  auth:
    container_name: auth
    image: 'node:17-alpine'
    # env_file:
    #   - ./auth/.env
    working_dir: /usr/src/app
    volumes:
      - './auth:/usr/src/app'
    command: npm run dev
    ports:
      - '3002:3000'
    networks:
      - goodfood

  users:
    container_name: users
    image: 'node:17-alpine'
    env_file:
      - ./users/api/.env
    working_dir: /usr/src/app
    volumes:
      - './users/api:/usr/src/app'
    command: npm run dev
    ports:
      - '3001:3000'
    networks:
      - goodfood
    depends_on:
      - users-db

  users-db:
    container_name: users-db
    image: postgres
    restart: always
    env_file:
      - ./users/db/.env
    volumes:
      - './users/db/data:/var/lib/postgresql/data'
      - './users/db/scripts/init.sql:/docker-entrypoint-initdb.d/init.sql'
    ports:
      - '5432:5432'
    networks:
      - goodfood

  users-adminer:
    container_name: users-adminer
    restart: unless-stopped
    image: adminer
    ports:
      - '8181:8080'
    networks:
      - goodfood
    depends_on:
      - users-db

http:
  port: 8080
admin:
  port: 9876
  host: localhost

apiEndpoints:
  users:
    path: ['/users', '/users/*']
  auth:
    path: ['/auth', '/auth/*']

serviceEndpoints:
  users:
    url: 'http://users:3001'
  auth:
    url: 'http://auth:3002'

policies:
  - log
  - proxy
  # - jwt
  # - request-transformer

pipelines:
  authPipeline:
    apiEndpoints:
      - auth
    policies:
      - log:
          action:
            message: 'auth ${req.method}'
      - proxy:
          - action:
              serviceEndpoint: auth
              changeOrigin: true

  usersPipeline:
    apiEndpoints:
      - users
    policies:
      - log:
          action:
            message: 'users ${req.method}'
      - proxy:
          - action:
              serviceEndpoint: users
              changeOrigin: true
      # - jwt:
      #     action:
      #       secretOrPublicKey: 'goodfood'
      #       checkCredentialExistence: false
      # - request-transformer:
      #     action:
      #       body:
      #         add:
      #           user: req.user

policies:
  - log
  - proxy
  - jwt
  - rate-limit
  - request-transformer
  - cors

pipelines:
  authPipeline: 
    apiEndpoints: 
      - auth
    policies: 
      -
        cors:
          -
            action:
              origin: '*'
              methods: 'HEAD,PUT,PATCH,POST,DELETE'
              allowedHeaders: ['Content-Type', 'Authorization']
      - 
        log: 
          action:
            message: 'auth ${req.method}'
      - 
        proxy:
          action: 
            serviceEndpoint: di

const cors = require('cors');
// Enabling CORS
const corsOptions = {
  origin: '*',
  methods: ['POST', 'GET', 'PATCH', 'DELETE'],
  allowedHeaders: ['Content-Type', 'Authorization']
}
app.use(cors(corsOptions));

Access to XMLHttpRequest at 'http://127.0.0.1:8080/api/v1/users/login' from 
origin 'http://localhost:3000' has been blocked by CORS policy: Response to 
preflight request doesnt pass access control check: No 'Access-Control- 
Allow-Origin' header is present on the requested resource.

const config = {
    headers: {
      'Content-Type': 'application/json',
    },
  };
const body = JSON.stringify({ email, password });
const res = await axios.post('http://127.0.0.1:8080/api/v1/users/login', body, config);

NAME                                READY   STATUS    RESTARTS   AGE
api-gateway-depl-88b4c8b77-zdgjw    1/1     Running   0          10m
auth-depl-7cb78c4dcf-wxrwd          1/1     Running   0          10m
links-depl-69d749955d-5xf9b         1/1     Running   0          6m3s

NAME              TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
api-gateway-srv   NodePort    10.98.213.62             8080:30623/TCP   12m
auth-srv          ClusterIP   10.98.214.62             3000/TCP         12m
kubernetes        ClusterIP   10.96.0.1                443/TCP          25h
links-srv         ClusterIP   10.99.37.46              3001/TCP         12m

http:
  port: 8080
admin:
  port: 9876
  host: localhost
apiEndpoints:
  api:
    host: localhost
    paths: '/ip'
  user:
    host: localhost
    paths: '/user/signup'
serviceEndpoints:
  httpbin:
    url: 'https://httpbin.org'
  usersrv:
    url: 'http://auth-srv:3000/user/signup'
policies:
  - basic-auth
  - cors
  - expression
  - key-auth
  - log
  - oauth2
  - proxy
  - rate-limit
pipelines:
  default:
    apiEndpoints:
      - api
    policies:
      - proxy:
          - action:
              serviceEndpoint: httpbin 
              changeOrigin: true

POST http://localhost:30623/user/signup

const axios = require("axios");
const jsonParser = require("express").json();
const { PassThrough } = require("stream");

module.exports = {
  name: 'gql-transform',
  schema: {
    ... // removed for brevity sakes
  },
  policy: (actionParams) => {
    return (req, res, next) => {
      req.egContext.requestStream = new PassThrough();
      req.pipe(req.egContext.requestStream);
  
      return jsonParser(req, res, () => {
        req.body = JSON.stringify({
          ...req.body,
          variables: {
            ...req.body.variables,
            clientID: '1234'
          }
        });

        console.log(req.body); // "clientID": "1234" is logged in the body.variables successfully here
        return next();
      });
    };
  }
};

# Core
db:
  redis:
    host: [host]
    port: [port]
    namespace: [namespace]
    password: [password]

REDIS_URL = "redis://h:[psw]@[host]:[port]"

http:
  port: 8080
admin:
  port: 9876
  host: localhost
apiEndpoints:
  bookAdmin:
    path: '/v1/admin*'
  bookUser:
    path: '/v1/user*'
serviceEndpoints:
  book:
    url: 'http://localhost:5000'
policies:
  - cors
  - log
  - proxy
  - jwt
  - request-transformer
pipelines:
  bookAdminPipeline:
    apiEndpoints:
      - bookAdmin
    policies:

      -
        cors:
          action:
            origin: '*'
            methods: 'GET,HEAD,PUT,PATCH,POST,DELETE'   
      -
        jwt:
          action:
            secretOrPublicKey: 'JWTKey'
            checkCredentialExistence: false

      -
        proxy:
          action:
            serviceEndpoint: book
  bookUserPipeline:
    apiEndpoints:
      - bookUser
    policies:

      -
        cors:
          action:
            origin: '*'
            methods: 'GET,HEAD,PUT,PATCH,POST,DELETE'   
      -
        proxy:
          action:
            serviceEndpoint: book

var admin = require('../authentication/firebase');

 getAuthToken = (req, res, next) => {
    if (
      req.headers.authorization &&
      req.headers.authorization.split(' ')[0] === 'Bearer'
    ) {
      req.authToken = req.headers.authorization.split(' ')[1];
    } else {
      req.authToken = null;
    }
    next();
  };


checkIfAuthenticated = (req, res, next) => {
   getAuthToken(req, res, async () => {
      try {
        const { authToken } = req;
        const userInfo = await admin
          .auth()
          .verifyIdToken(authToken);
        req.authId = userInfo.uid;
        return next();
      } catch (e) {
        return res
          .status(401)
          .send({ error: 'You are not authorized to make this request' });
      }
    });
  };

  module.exports = checkIfAuthenticated

apiVersion: v1
kind: Service
metadata:
  name: express-gateway-balancer
spec:
  selector:
    app: express-gateway
  type: LoadBalancer
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080

apiVersion: v1
kind: Service
metadata:
  name: express-gateway-service
spec:
  selector:
    app: express-gateway
  type: NodePort
  ports:
    - protocol: TCP
      port: 80
      targetPort: 8080

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: gateway-service-ingress
  annotations:
    kubernetes.io/ingress.global-static-ip-name: "gateway-ip"
spec:
  backend:
    serviceName: express-gateway-service
    servicePort: 80

apiVersion: apps/v1
kind: Deployment
metadata:
  name: express-gateway
  labels:
    app: express-gateway
spec:
  selector:
    matchLabels:
      app: express-gateway
  replicas: 3
  template:
    metadata:
      labels:
        app: express-gateway
    spec:
      containers:
        - name:  express-gateway
          image: gcr.io/PROJECT_ID/apigatewayservice:v1
          ports:
            - name: gateway
              containerPort: 8080
            - name: admin
              containerPort: 9876

http:
  port: ${PORT:-8080}
  host: ${HOST:-localhost} 
https:
  port: ${PORT:-8080}
  host: ${HOST:-localhost}   
apiEndpoints:
  ....

[EG:gateway] gateway http server listening on :::8080

State changed from starting to crashed

Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch