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middleware.go
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middleware.go
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// Copyright © 2019 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 gatewayconfigurationserver
import (
"context"
"net/http"
"github.com/gorilla/mux"
"go.thethings.network/lorawan-stack/v3/pkg/auth/rights"
"go.thethings.network/lorawan-stack/v3/pkg/ttnpb"
"go.thethings.network/lorawan-stack/v3/pkg/webhandlers"
"go.thethings.network/lorawan-stack/v3/pkg/webmiddleware"
)
type gatewayIDKeyType struct{}
var gatewayIDKey gatewayIDKeyType
func withGatewayID(ctx context.Context, id *ttnpb.GatewayIdentifiers) context.Context {
return context.WithValue(ctx, gatewayIDKey, id)
}
func gatewayIDFromContext(ctx context.Context) *ttnpb.GatewayIdentifiers {
id, ok := ctx.Value(gatewayIDKey).(*ttnpb.GatewayIdentifiers)
if !ok {
panic("no gateway identifiers found in context")
}
return id
}
func validateAndFillIDs(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
gtwID := &ttnpb.GatewayIdentifiers{
GatewayId: mux.Vars(r)["gateway_id"],
}
if err := gtwID.ValidateContext(ctx); err != nil {
webhandlers.Error(w, r, err)
return
}
ctx = withGatewayID(ctx, gtwID)
next.ServeHTTP(w, r.WithContext(ctx))
})
}
func (s *Server) requireGatewayRights(required ...ttnpb.Right) webmiddleware.MiddlewareFunc {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
gtwID := gatewayIDFromContext(ctx)
if err := rights.RequireGateway(ctx, gtwID, required...); err != nil {
webhandlers.Error(w, r, err)
return
}
next.ServeHTTP(w, r)
})
}
}