apex/up

// Package cors provides CORS support.
package cors

import (
    "net/http"

    "github.com/rs/cors"

    "github.com/apex/up"
    "github.com/apex/up/config"
)

// New CORS handler.
func New(c *up.Config, next http.Handler) http.Handler {
    if c.CORS == nil {
        return next
    }

    return cors.New(options(c.CORS)).Handler(next)
}

// options returns the canonical options.
func options(c *config.CORS) cors.Options {
    return cors.Options{
        AllowedOrigins:   c.AllowedOrigins,
        AllowedMethods:   c.AllowedMethods,
        AllowedHeaders:   c.AllowedHeaders,
        ExposedHeaders:   c.ExposedHeaders,
        AllowCredentials: c.AllowCredentials,
        MaxAge:           c.MaxAge,
        Debug:            c.Debug,
    }
}