Middleware cors

Enable CORS interceptor/middleware for the server.

Installation

go get github.com/rookie-ninja/rk-boot
go get github.com/rookie-ninja/rk-echo

General options

These are general options to start an echo server with rk-boot

name description type default value
echo.name The name of echo server string N/A
echo.port The port of echo server integer nil, server won’t start
echo.enabled Enable echo entry bool false
echo.description Description of echo entry. string ""

CORS options

name description type default value
echo.interceptors.cors.enabled Enable cors interceptor boolean false
echo.interceptors.cors.allowOrigins Provide allowed origins with wildcard enabled. []string *
echo.interceptors.cors.allowMethods Provide allowed methods returns as response header of OPTIONS request. []string All http methods
echo.interceptors.cors.allowHeaders Provide allowed headers returns as response header of OPTIONS request. []string Headers from request
echo.interceptors.cors.allowCredentials Returns as response header of OPTIONS request. bool false
echo.interceptors.cors.exposeHeaders Provide exposed headers returns as response header of OPTIONS request. []string ""
echo.interceptors.cors.maxAge Provide max age returns as response header of OPTIONS request. int 0

Quick start

1.Create boot.yaml

---
echo:
  - name: greeter                     # Required
    port: 8080                        # Required
    enabled: true                     # Required
    commonService:
      enabled: true                   # Optional, default: false
    interceptors:
      cors:
        enabled: true                 # Optional, default: false
        # Accept all origins from localhost
        allowOrigins:
          - "http://localhost:*"      # Optional, default: *

2.Create main.go

// Copyright (c) 2021 rookie-ninja
//
// Use of this source code is governed by an Apache-style
// license that can be found in the LICENSE file.
package main

import (
	"context"
	"github.com/rookie-ninja/rk-boot"
	_ "github.com/rookie-ninja/rk-echo/boot"
)

// Application entrance.
func main() {
	// Create a new boot instance.
	boot := rkboot.NewBoot()

	// Bootstrap
	boot.Bootstrap(context.Background())

	// Wait for shutdown sig
	boot.WaitForShutdownSig(context.Background())
}

3.Create cors.html

<!DOCTYPE html>
<html>
<body>

<h1>CORS Test</h1>

<p>Call http://localhost:8080/rk/v1/healthy</p>

<script type="text/javascript">
    window.onload = function() {
        var apiUrl = 'http://localhost:8080/rk/v1/healthy';
        fetch(apiUrl).then(response => response.json()).then(data => {
            document.getElementById("res").innerHTML = data["healthy"]
        }).catch(err => {
            document.getElementById("res").innerHTML = err
        });
    };
</script>

<h4>Response: </h4>
<p id="res"></p>

</body>
</html>

4.Directory hierarchy

.
├── boot.yaml
├── cors.html
├── go.mod
├── go.sum
└── main.go

0 directories, 5 files

5.Validate

Open cors.html

6.With blocking CORS

Set echo.interceptors.cors.allowOrigins to http://localhost:8080 in order to block request.

---
echo:
  - name: greeter                     # Required
    port: 8080                        # Required
    enabled: true                     # Required
    commonService:
      enabled: true                   # Optional, default: false
    interceptors:
      cors:
        enabled: true                 # Optional, default: false
        allowOrigins:
          - "http://localhost:8080"   # Optional, default: *

Cheers

Last modified December 12, 2021 : Update based on rk-boot@v1.4.0 (233e143)