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package middleware // import "github.com/docker/docker/api/server/middleware"
import (
"context"
"net/http"
"github.com/containerd/log"
"github.com/docker/docker/api/types/registry"
)
// CORSMiddleware injects CORS headers to each request
// when it's configured.
type CORSMiddleware struct {
defaultHeaders string
}
// NewCORSMiddleware creates a new CORSMiddleware with default headers.
func NewCORSMiddleware(d string) CORSMiddleware {
return CORSMiddleware{defaultHeaders: d}
}
// WrapHandler returns a new handler function wrapping the previous one in the request chain.
func (c CORSMiddleware) WrapHandler(handler func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error) func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
return func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
// If "api-cors-header" is not given, but "api-enable-cors" is true, we set cors to "*"
// otherwise, all head values will be passed to HTTP handler
corsHeaders := c.defaultHeaders
if corsHeaders == "" {
corsHeaders = "*"
}
log.G(ctx).Debugf("CORS header is enabled and set to: %s", corsHeaders)
w.Header().Add("Access-Control-Allow-Origin", corsHeaders)
w.Header().Add("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, "+registry.AuthHeader)
w.Header().Add("Access-Control-Allow-Methods", "HEAD, GET, POST, DELETE, PUT, OPTIONS")
return handler(ctx, w, r, vars)
}
}
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