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/
header.go
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/
header.go
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// Copyright 2020 the Exposure Notifications Verification Server authors
//
// 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 middleware
import (
"net/http"
"github.com/google/exposure-notifications-verification-server/pkg/controller"
"github.com/google/exposure-notifications-verification-server/pkg/render"
"github.com/gorilla/mux"
)
// RequireHeader requires that the request have a certain header present. The
// header just needs to exist - it does not need to have a specific value.
func RequireHeader(header string, h *render.Renderer) mux.MiddlewareFunc {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if v := r.Header.Get(header); v == "" {
controller.Unauthorized(w, r, h)
return
}
next.ServeHTTP(w, r)
})
}
}
// RequireHeaderValues requires that the request have a certain header present
// and that the value be one of the supplied entries.
func RequireHeaderValues(header string, allowed []string, h *render.Renderer) mux.MiddlewareFunc {
want := make(map[string]struct{}, len(allowed))
for _, v := range allowed {
want[v] = struct{}{}
}
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
vals := r.Header.Values(header)
if len(vals) == 0 {
controller.Unauthorized(w, r, h)
return
}
found := false
for _, v := range vals {
if _, ok := want[v]; ok {
found = true
break
}
}
if !found {
controller.Unauthorized(w, r, h)
return
}
next.ServeHTTP(w, r)
})
}
}