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Add middleware for debug headers (#497)
* Add middleware for debug headers If the request sends an x-debug header with any value, the response headers will be populated with the build ID and tag. * Make it a constant * Use constants
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// Copyright 2020 Google LLC | ||
// | ||
// 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. | ||
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package middleware | ||
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import ( | ||
"context" | ||
"net/http" | ||
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"github.com/google/exposure-notifications-verification-server/pkg/buildinfo" | ||
"github.com/gorilla/mux" | ||
) | ||
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const ( | ||
HeaderDebug = "x-debug" | ||
HeaderDebugBuildID = "x-build-id" | ||
HeaderDebugBuildTag = "x-build-tag" | ||
) | ||
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// ProcessDebug adds additional debugging information to the response if the | ||
// request included the "X-Debug" header with any value. | ||
func ProcessDebug(ctx context.Context) mux.MiddlewareFunc { | ||
return func(next http.Handler) http.Handler { | ||
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
if r.Header.Get(HeaderDebug) != "" { | ||
w.Header().Set(HeaderDebugBuildID, buildinfo.BuildID) | ||
w.Header().Set(HeaderDebugBuildTag, buildinfo.BuildTag) | ||
} | ||
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next.ServeHTTP(w, r) | ||
}) | ||
} | ||
} |