forked from TheThingsNetwork/lorawan-stack
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathmetadata.go
More file actions
46 lines (42 loc) · 1.42 KB
/
metadata.go
File metadata and controls
46 lines (42 loc) · 1.42 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
// Copyright © 2020 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 webmiddleware
import (
"net/http"
"net/textproto"
"strings"
"google.golang.org/grpc/metadata"
)
// Metadata returns a middleware that sets gRPC metadata from the request headers.
func Metadata(keys ...string) MiddlewareFunc {
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
header := textproto.MIMEHeader(r.Header)
md := make(metadata.MD)
for _, key := range keys {
if value := header.Values(key); value != nil {
md[strings.ToLower(key)] = value
}
}
if len(md) > 0 {
if existingMD, ok := metadata.FromIncomingContext(ctx); ok {
md = metadata.Join(existingMD, md)
}
ctx = metadata.NewIncomingContext(ctx, md)
}
next.ServeHTTP(w, r.WithContext(ctx))
})
}
}