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// Package cors/wrapper/gin provides gin.HandlerFunc to handle CORS related
// requests as a wrapper of github.com/rs/cors handler.
package gin
import (
"net/http"
"github.com/gin-gonic/gin"
"github.com/rs/cors"
)
// Options is a configuration container to setup the CORS middleware.
type Options = cors.Options
// corsWrapper is a wrapper of cors.Cors handler which preserves information
// about configured 'optionPassthrough' option.
type corsWrapper struct {
*cors.Cors
optionPassthrough bool
}
// build transforms wrapped cors.Cors handler into Gin middleware.
func (c corsWrapper) build() gin.HandlerFunc {
return func(ctx *gin.Context) {
c.HandlerFunc(ctx.Writer, ctx.Request)
if !c.optionPassthrough &&
ctx.Request.Method == http.MethodOptions &&
ctx.GetHeader("Access-Control-Request-Method") != "" {
// Abort processing next Gin middlewares.
ctx.AbortWithStatus(http.StatusOK)
}
}
}
// AllowAll creates a new CORS Gin middleware with permissive configuration
// allowing all origins with all standard methods with any header and
// credentials.
func AllowAll() gin.HandlerFunc {
return corsWrapper{Cors: cors.AllowAll()}.build()
}
// Default creates a new CORS Gin middleware with default options.
func Default() gin.HandlerFunc {
return corsWrapper{Cors: cors.Default()}.build()
}
// New creates a new CORS Gin middleware with the provided options.
func New(options Options) gin.HandlerFunc {
return corsWrapper{cors.New(options), options.OptionsPassthrough}.build()
}
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