cors

README

Cors

The Cors module enhances github.com/gin-contrib/cors with more convenient methods and configuration.

This project has been developped by the Aloe team and is now open source.

Overview

The cors module offers:

• A Conf structure with yaml and mapstructure tags
• Builder methods for the convenient creation of a new middleware
• Default values to reduce code repetition in your projects
• Easy integration because it embed a native github.com/gin-contrib/cors

Concepts

Build your middleware on default configuration

The default middleware provides an open CORS configuration that can be useful during the development process.

    builder := new(cors.Builder)
    conf := builder.New().Build()

Easily add custom values

Enhance the security of your Gin API by specifying allowed origins in addition to the default configuration.

    builder := new(cors.Builder)
    conf := builder.New().WithOrigins("http://localhost:8080").Build()

Usage

Use the cors middleware on your gin endpoints.

    Router := gin.New()
    corsBuilder := new(cors.Builder)

    Router.Use(cors.Middleware(corsBuilder.New().WithOrigins("http://localhost:8080").Build()))

Use it with default configuration.

    Router := gin.New()
    Router.Use(cors.Middleware(nil))

Use if with the Conf struct

    Router := gin.New()

    conf := &cors.Conf{
        // your parsed configuration
    }

    corsBuilder := new(cors.Builder)
  
    Router.Use(cors.Middleware(corsBuilder.NewFromConf(conf).Build()))

Contributing

This section will be added soon.

License

Client is released under the MIT license. See LICENSE.txt.

Documentation

Index

• func Middleware(c *cors.Config) gin.HandlerFunc
• type Builder
  • func (builder *Builder) Build() *cors.Config
  • func (builder *Builder) New() *Builder
  • func (builder *Builder) NewFromConfig(c *Conf) *Builder
  • func (builder *Builder) WithCredentials(allowCredentials bool) *Builder
  • func (builder *Builder) WithHeaders(headers ...string) *Builder
  • func (builder *Builder) WithMethods(methods ...string) *Builder
  • func (builder *Builder) WithOrigins(origins ...string) *Builder
• type Conf

Functions

func Middleware

func Middleware(c *cors.Config) gin.HandlerFunc

Middleware is a Gin middleware function that adds CORS (Cross-Origin Resource Sharing) support to the HTTP responses. It takes a cors.Config parameter and returns a Gin middleware handler. If the provided cors.Config is nil, it creates a default configuration using the Builder and applies it to the middleware.

Use the Builder to build the cors.Config.

Types

type Builder

type Builder struct {
	*cors.Config
}

Builder is a builder pattern for creating CORS (Cross-Origin Resource Sharing) configurations. It provides methods to set various CORS options and ultimately build a cors.Config.

func (*Builder) Build

func (builder *Builder) Build() *cors.Config

Build returns the finalized cors.Config after applying the configured options.

func (*Builder) New

func (builder *Builder) New() *Builder

New creates a new Builder instance with default CORS configuration values.

func (*Builder) NewFromConfig

func (builder *Builder) NewFromConfig(c *Conf) *Builder

NewFromConfig creates a new Builder instance with a custom configuration provided by the Conf parameter.

func (*Builder) WithCredentials

func (builder *Builder) WithCredentials(allowCredentials bool) *Builder

WithCredentials sets whether credentials (including cookies) can be sent with the CORS request.

func (*Builder) WithHeaders

func (builder *Builder) WithHeaders(headers ...string) *Builder

WithHeaders sets the allowed headers for CORS.

func (*Builder) WithMethods

func (builder *Builder) WithMethods(methods ...string) *Builder

WithMethods sets the allowed HTTP methods for CORS.

func (*Builder) WithOrigins

func (builder *Builder) WithOrigins(origins ...string) *Builder

WithOrigins sets the allowed origins for CORS.

type Conf

type Conf struct {
	AllowOrigins     []string      `yaml:"allow_origins" mapstructure:"allow_origins"`         // List of allowed origins. "*" means allows all origins.
	AllowMethods     []string      `yaml:"allow_methods" mapstructure:"allow_methods"`         // List of allowed HTTP methods.
	AllowHeaders     []string      `yaml:"allow_headers" mapstructure:"allow_headers"`         // List of allowed headers.
	ExposeHeaders    []string      `yaml:"expose_headers" mapstructure:"expose_headers"`       // List of headers exposed to the browser.
	AllowCredentials bool          `yaml:"allow_credentials" mapstructure:"allow_credentials"` // Whether credentials can be included.
	MaxAge           time.Duration `yaml:"max_age" mapstructure:"max_age"`                     // Maximum age of a preflight request.
}

Conf represents the configuration structure for CORS (Cross-Origin Resource Sharing) settings. It includes fields for specifying allowed origins, methods, headers, exposed headers, allowing credentials, and the maximum age of a CORS preflight request. It is actually a mirror of cors.Config structure.