github.com/kyma-incubator/compass/components/director@v0.0.0-20230623144113-d764f56ff805/pkg/header/middleware.go (about)

     1  /*
     2   * Copyright 2020 The Compass Authors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package header
    18  
    19  import (
    20  	"context"
    21  	"net/http"
    22  )
    23  
    24  type contextKey string
    25  
    26  // ContextKey missing godoc
    27  const ContextKey contextKey = "HeadersCtx"
    28  
    29  // AttachHeadersToContext returns middleware that attaches all headers used for tracing in the current request.
    30  func AttachHeadersToContext() func(next http.Handler) http.Handler {
    31  	return func(next http.Handler) http.Handler {
    32  		return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
    33  			ctx := r.Context()
    34  			ctx = context.WithValue(ctx, ContextKey, r.Header)
    35  			r = r.WithContext(ctx)
    36  			next.ServeHTTP(rw, r)
    37  		})
    38  	}
    39  }