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http.go
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http.go
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// Copyright (c) 2022 The Jaeger 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 tenancy
import (
"context"
"net/http"
"google.golang.org/grpc/metadata"
)
// PropagationHandler returns a http.Handler containing the logic to extract
// the tenancy header of the http.Request and insert the tenant into request.Context
// for propagation. The token can be accessed via tenancy.GetTenant().
func ExtractTenantHTTPHandler(tc *Manager, h http.Handler) http.Handler {
if !tc.Enabled {
return h
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
tenant := r.Header.Get(tc.Header)
if tenant == "" {
w.WriteHeader(http.StatusUnauthorized)
w.Write([]byte("missing tenant header"))
return
}
if !tc.Valid(tenant) {
w.WriteHeader(http.StatusUnauthorized)
w.Write([]byte("unknown tenant"))
return
}
ctx := WithTenant(r.Context(), tenant)
h.ServeHTTP(w, r.WithContext(ctx))
})
}
// MetadataAnnotator returns a function suitable for propagating tenancy
// via github.com/grpc-ecosystem/grpc-gateway/runtime.NewServeMux
func (tc *Manager) MetadataAnnotator() func(context.Context, *http.Request) metadata.MD {
return func(ctx context.Context, req *http.Request) metadata.MD {
tenant := req.Header.Get(tc.Header)
if tenant == "" {
// The HTTP request lacked the tenancy header. Pass along
// empty metadata -- the gRPC query service will reject later.
return metadata.Pairs()
}
return metadata.New(map[string]string{
tc.Header: tenant,
})
}
}