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cookie.go
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/
cookie.go
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// Copyright © 2020 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package webmiddleware
import (
"context"
"net/http"
"github.com/gorilla/securecookie"
"go.thethings.network/lorawan-stack/v3/pkg/errors"
)
type secureCookieCtxKeyType struct{}
var secureCookieCtxKey secureCookieCtxKeyType
// Cookies is a middleware that allows handling of secure cookies.
func Cookies(hashKey, blockKey []byte) MiddlewareFunc {
s := securecookie.New(hashKey, blockKey)
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
ctx = context.WithValue(ctx, secureCookieCtxKey, s)
next.ServeHTTP(w, r.WithContext(ctx))
})
}
}
var errInvalidContext = errors.DefineInternal("secure_cookie_invalid_context", "No secure cookie value in this context")
// GetSecureCookie retrieves the secure cookie encoder from the context.
func GetSecureCookie(ctx context.Context) (*securecookie.SecureCookie, error) {
secureCookie, _ := ctx.Value(secureCookieCtxKey).(*securecookie.SecureCookie)
if secureCookie == nil {
return nil, errInvalidContext.New()
}
return secureCookie, nil
}