dotcloud/docker

package middleware // import "github.com/docker/docker/api/server/middleware"

import (
    "context"
    "net/http"
)

// ExperimentalMiddleware is a the middleware in charge of adding the
// 'Docker-Experimental' header to every outgoing request
type ExperimentalMiddleware struct {
    experimental string
}

// NewExperimentalMiddleware creates a new ExperimentalMiddleware
func NewExperimentalMiddleware(experimentalEnabled bool) ExperimentalMiddleware {
    if experimentalEnabled {
        return ExperimentalMiddleware{"true"}
    }
    return ExperimentalMiddleware{"false"}
}

// WrapHandler returns a new handler function wrapping the previous one in the request chain.
func (e ExperimentalMiddleware) 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 {
        w.Header().Set("Docker-Experimental", e.experimental)
        return handler(ctx, w, r, vars)
    }
}