80 lines
2.3 KiB
Go
80 lines
2.3 KiB
Go
package middlewares
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//Middleware based on https://github.com/unrolled/secure
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import (
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"net/http"
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"github.com/containous/traefik/types"
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)
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// HeaderOptions is a struct for specifying configuration options for the headers middleware.
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type HeaderOptions struct {
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// If Custom request headers are set, these will be added to the request
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CustomRequestHeaders map[string]string
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// If Custom response headers are set, these will be added to the ResponseWriter
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CustomResponseHeaders map[string]string
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}
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// HeaderStruct is a middleware that helps setup a few basic security features. A single headerOptions struct can be
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// provided to configure which features should be enabled, and the ability to override a few of the default values.
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type HeaderStruct struct {
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// Customize headers with a headerOptions struct.
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opt HeaderOptions
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}
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// NewHeaderFromStruct constructs a new header instance from supplied frontend header struct.
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func NewHeaderFromStruct(headers types.Headers) *HeaderStruct {
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o := HeaderOptions{
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CustomRequestHeaders: headers.CustomRequestHeaders,
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CustomResponseHeaders: headers.CustomResponseHeaders,
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}
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return &HeaderStruct{
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opt: o,
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}
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}
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// NewHeader constructs a new header instance with supplied options.
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func NewHeader(options ...HeaderOptions) *HeaderStruct {
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var o HeaderOptions
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if len(options) == 0 {
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o = HeaderOptions{}
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} else {
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o = options[0]
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}
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return &HeaderStruct{
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opt: o,
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}
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}
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// Handler implements the http.HandlerFunc for integration with the standard net/http lib.
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func (s *HeaderStruct) Handler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Let headers process the request.
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s.Process(w, r)
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h.ServeHTTP(w, r)
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})
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}
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func (s *HeaderStruct) ServeHTTP(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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s.Process(w, r)
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// If there is a next, call it.
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if next != nil {
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next(w, r)
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}
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}
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// Process runs the actual checks and returns an error if the middleware chain should stop.
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func (s *HeaderStruct) Process(w http.ResponseWriter, r *http.Request) {
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// Loop through Custom request headers
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for header, value := range s.opt.CustomRequestHeaders {
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r.Header.Set(header, value)
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}
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// Loop through Custom response headers
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for header, value := range s.opt.CustomResponseHeaders {
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w.Header().Add(header, value)
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}
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}
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